Paper Award

ISJ award

 
The paper award is presented to the author of an excellent paper that contributes to scholarship and technology in the area covered by this society.
 

FY 2022 (37th)

“Prediction of Jetting Stability of Pigment Dispersions by Zeta Potential Distribution Measurement”

 
Journal of the Imaging Society of Japan, 61(3), pp. 200-208 (2022)
 
Teruyuki FUKUDA, Takeshi ASHIZAWA, Satoshi TANAKA, Iain BLAKE
 
Kao Corporation
 
Reason for award: It is extremely useful that they have creatively and logically discovered a predictive evaluation method for ink ejection in thermal heads through calculations. The logical structure of the paper is clear and the discussion is solid. Moreover, the new index based on the zeta potential of the pigment dispersion was shown to be effective as an evaluation index for the ejection durability of inkjet heads. The fact that it is now possible to predict ejection durability based on physical property values ​​alone is highly commendable. Although there are not many manufacturers that manufacture thermal heads, the impact on ink development has been large, and further development of thermal heads and inks is expected, making it worthy of the Paper Award.
 

福田輝幸
Teruyuki FUKUDA
芦沢健
Takeshi ASHIZAWA
田中聡
Satoshi TANAKA
Iain BLAKE
Iain BLAKE

FY 2021 (36th)

“Halftone Technology for Improving Density Robustness Against Misregistration” 

 
Journal of the Imaging Society of Japan, 60(5), pp. 450-457 (2021)
 
Toshiaki KAKUTANI, Takuma HAYASHI, Takuya WAKAYAMA, Kohei UTSUNOMIYA
 
Seiko Epson Corporation
 
Reason for award: It is novel and original that the extremely difficult problem of density fluctuations caused by cockling during printing was solved by developing a highly robust halftone technology that reduces density fluctuations caused by positional misalignment. The process of considering the issues to be solved, narrowing down the solution methods, and verifying them is logically summarized. Using a new method, it has been possible to significantly improve the “uneven density” that occurs in inkjet printers using halftone image processing technology at almost zero cost and without any hardware countermeasures. The research results are expected to contribute to the further development of inkjet printing technology and image processing technology.
 

Toshiaki KAKUTANI
Takuma HAYASHI
Takuya WAKAYAMA
Kohei UTSUNOMIYA

FY 2020 (35th)

“Numerical Simulation of Inkjet Droplet Spreading with the Consideration of the Relationship between Dynamic Contact Angle and Contact Line Velocity”

 
Journal of the Imaging Society of Japan, 59(1), pp. 96-102 (2020)
 
Masayuki FUKUOKA*, Masami KADONAGA*,**
 
*Ricoh Co., Ltd., **Tokyo Institute of Technology
 
Reason for award: The paper deals with ink containing pigments and media that are actually used, which have not been discussed in existing research, and describes in an orderly manner that simulation results that are in good agreement with experimental results were obtained. Regarding the image formation process that governs inkjet image quality, simulation results that modeled the spreading behavior of ink droplets using two types of model inks and three types of media showed good agreement with actual measurement results. It is also worthy of praise that they have acquired the technology to logically predict the behavior of pL-order droplets immediately after landing, which is of great interest, in time and space and with high precision.
 

Masayuki FUKUOKA
Masami KADONAGA

FY 2019 (34th)

“Jet Velocity Control Method Using PVA Gel for a New Ink-jet Generator”


 
Journal of the Imaging Society of Japan, 58(1), pp. 19-27 (2019)
 
Mao MAESHIMA, Honoka KUDO, Hajime ONUKI, Chihiro KURIHARA, Akihito KIYAMA, Yoshiyuki TAGAWA
 
Tokyo University of Agriculture and Technology
 
Reason for award: This is a report on a new inkjet injection mechanism that enables the injection of high viscosity liquids, and the jet injection control mechanism is elucidated through quantitative evaluation and clear logical development regarding injection speed control using PVA gel. This technology is highly unique and novel as it actively utilizes cavitation (bubbles) in the jet injection mechanism. In particular, their work is highly praised for clarifying the control mechanism both theoretically and empirically through analysis using a pressure propagation model and experimental verification.
 

Mao MAESHIMA
Honoka KUDO
Hajime ONUKI
Chihiro KURIHARA
Akihito KIYAMA
Yoshiyuki TAGAWA

FY 2018 (33rd)

“Verification of Cockling Reduction Effect on Offset-Coated Paper by Drying Technology Using Laser Exposure and Consideration on Cockling Mechanism by FEM Simulation Modified Thermal Expansion Model”


 
Journal of the Imaging Society of Japan, 57(6), pp. 692-699 (2018)
 
Satoshi HASEBE, Yukari MOTOSUGI, Takeshi ZENGO, Toshinobu HAMAZAKI, Takuma ISHIHARA
 
Fuji Xerox Co., Ltd.
 
Reason for award: The design and control of the drying process of inkjet paper is an important area in which much work has been done, and with the development of industrial applications due to faster inkjet technology, it is becoming even more important. This paper is a research report on the evaluation of the superiority of a paper drying method using laser irradiation developed by Fuji Xerox Co., Ltd. to reduce the “waving” that occurs when drying offset coated paper, and on the development of a simulation model for paper waviness and its comparison with actual measured values. Quantitative simulation methods for inkjet paper waviness are expected to provide new guidelines for paper drying process design. Based on the above, this paper is evaluated to be worthy of the paper award due to its novelty, importance, and potential for development in image-related field research.
 

Satoshi HASEBE
Yukari MOTOSUGI
Takeshi ZENGO
Toshinobu HAMAZAKI
Takuma ISHIHARA

FY 2017 (32nd)

“New Evaluation Method for the ‘Appearence” of Black and Color, in the Glossy Prints in the Observation Environment”


 
Journal of the Imaging Society of Japan, 56(4), pp. 327-334 (2017)
 
Katsushi HARA, Takumi KANEKO, Yanai TOMOKAZU
 
Canon Inc.
 
Reason for award: They defined “appearance” as black density and color reproduction that change depending on the viewing environment, clarified problems with current methods through theoretical analysis, and proposed a new quantitative evaluation method. Furthermore, the effectiveness of the method was demonstrated through verification experiments using real objects. In addition, the evaluation method of this research has been used for products and has been put into practical use as an evaluation technology. This research is an extremely excellent result as one of the basic technologies for understanding “images” and improving their quality.
 

Katsushi HARA
Takumi KANEKO
Yanai TOMOKAZU

FY 2006 (31st)

“Analysis of Wetting and Coalescing Behavior of Minute Ink Droplets by MPS Simulation “


 
Journal of the Imaging Society of Japan, 55(2), pp. 176-183 (2016)
 
Ryosuke TAKAHASHI*, Nobuyuki HIROOKA*, Tomoyuki ITO*, Nobuyuki NAKAYAMA*, Hiroyuki WATANABE**, Hiroshi MATAKI**, Seiichi INOUE**

 
*Fuji Xerox Co., Ltd, **FUJIFILM Corporation
 
Reason for award: In order to improve the image quality of inkjet printers, it is important to control the wetting and coalescence behavior of ink droplets. In this study, they were able to quantify the wetting and coalescence behavior of ink droplets, which is difficult to understand experimentally due to size and state change rate constraints, with high accuracy and in a short time using a MOVing Particle Semi-lmplicit (MSP) simulation method. The consistency between the simulation results and the experimental results was also verified, and its effectiveness was also demonstrated. This method is useful for designing inkjet process parameters and ink characteristics, and is an extremely excellent result as one of the fundamental technologies for understanding inkjet technology and improving image quality. They were judged to be worthy of the paper award.
 

Ryosuke TAKAHASHI
Nobuyuki HIROOKA
Tomoyuki ITO
Nobuyuki NAKAYAMA
Hiroyuki WATANABE
Hiroshi MATAKI
Seiichi INOUE

FY 2015 (30th)

“Theoretical Study of Charge Transport Phenomena in Organic Electronics Devices”


 
Journal of the Imaging Society of Japan, 54(6), pp. 542-553 (2015)
 
Takayuki SHODA* , Qi GAO*, Akiteru FUJII**
 
*MCHC R & D Synergy Center, **Mitsubishi Chemical Corporation
 
Reason for award: They performed first-principles calculations on the charge transfer phenomena of various charge transport materials such as organic photosensitive materials, examined their performance at the molecular level, and proposed new calculation methods at the device level for FETs and other devices. This paper is highly novel and useful as a research on numerical analysis technology for charge transport properties. It is highly complete and worthy of the paper award.
 

Takayuki SHODA
Qi GAO
Akiteru FUJII

FY 2014 (29th)

“The Effects of Morphology of Electrode on the Coloration of Silver Deposition-based Electrochromic Device”


 
Journal of the Imaging Society of Japan, 53(4), pp. 265-271 (2014)
 
Ayako TSUBOI, Kazuki NAKAMURA, Norihisa KOBAYASHI
 
Chiba University
 
Reason for award: Electrochromism, which produces electrochemically reversible color changes, is expected to be applied to power-saving display and dimming devices such as electronic paper and digital signage. In this study, they evaluated the influence of the surface shape of the electrode on the optical properties of an electrochromic device whose color tone changes based on the reduction and precipitation of silver on the electrode. They found that a smooth electrode exhibits a mirror state, while an electrode coated with ITO particles exhibits a black state, demonstrating that the mirroring properties can be controlled arbitrarily by changing the electrode shape. It is expected that this technology will be developed into devices that can express color tones that have not been seen before. Furthermore, detailed analysis of the shape of the ITO particle-modified electrode and the shape of the deposited silver regarding the mechanism of black appearance, which is the key to display devices, may provide important knowledge for future application development in display devices. The paper was evaluated as worthy of the paper award.
 

Ayako TSUBOI
Kazuki NAKAMURA
Norihisa KOBAYASHI

FY 2013 (28th)

“High-Resolution Measurement of Electrostatic Latent Image Formed on Photoconductor Using Electron Beam Probe “


 
Journal of the Imaging Society of Japan, 52(6), pp. 501-508 (2013)
 
Hiroyuki SUHARA
 
RICOH Co., Ltd.
 
Reason for award: As an analysis technology for electrophotographic processes, the need for technology to visualize and quantify latent images with high resolution has been an important issue since the early days of electrophotography, and there is a high need for it. In this research, he developed a new latent image visualization and measurement technology that utilizes the electric field deflection of secondary electrons emitted during electron beam irradiation, making it possible to measure potentials on the micron order online. This is an extremely outstanding result as one of the important basic analysis techniques for understanding and advancing electrophotography technology. The paper was evaluated as worthy of the paper award.
 

Hiroyuki SUHARA

“Bayesian Estimation of Multispectral Image in Both Spatial and Spectral Domains”


 
Journal of the Imaging Society of Japan, 52(5), pp. 400-405 (2013)
 
Yusuke MURAYAMA, Ari IDE
 
Kyoto University
 
Reason for award: Applying super-resolution to images acquired by a multiband image scanner is a useful technique that can be applied to digital archiving of cultural properties. By combining Wiener estimation, a method for estimating spectral reflectance, and Bayesian super-resolution, a super-resolution method, this research achieved a 1.7-fold improvement in resolution with approximately one-third the imaging time of conventional methods. are doing. In addition to detailed discussions and quantitative evaluations, the proposed method significantly improved the image quality of restored images, and the theory construction that accompanied the results made this paper worthy of the paper award.
 

Yusuke MURAYAMA
Ari IDE

FY2012 (27th)

“Study on Drying Process of Ink at the Inkjet Nozzle Using a Laser Doppler Vibrometer”


 
Journal of the Imaging Society of Japan, 51(2), pp. 131-138 (2012)
 
Manabu SEO, Takeo TSUKAMOTO, Yoshihiro NORIKANE
 
Ricoh Co., Ltd.
 
Reason for award: Analysis of the drying process of inkjet nozzles is an important technology as higher precision in inkjet is required for applications such as digital fabrication. This research can be said to have established an innovative analysis method through theoretical and experimental verification, and is expected to contribute to the development of inkjet technology.
 

Manabu SEO
Takeo TSUKAMOTO
Yoshihiro NORIKANE

FY 2011 (26th)

“An Attempt to Estimate a Vegetation Index with Characteristics of Near-infrared Images Captured by Digital Camera”


 
Journal of the Imaging Society of Japan, 50(6), pp. 514-420 (2011)
 
Keiji OSAKI
 
International Christian University
 
Reason for award: Observation of vegetation distribution, which is one way to understand the environmental situation, has traditionally been carried out mainly using remote sensing methods. In this paper, the author attempted to estimate vegetation distribution using a commercially available digital camera instead of conventional satellites or airborne sensors. Focusing on the sensitivity characteristics of digital cameras, he proposed methods such as using optical filters to obtain the data needed for vegetation, and through image processing, he succeeded in bringing the measurement results closer to those obtained using a spectral radiance meter. The method and theoretical development of obtaining practical results using inexpensive equipment were highly evaluated.
 

Keiji OSAKI

FY 2010 (25th)

“Study of Preferred Color Reproduction and the Evaluation Method”


 
Journal of the Imaging Society of Japan, 49(5), pp. 384-390 (2010)
 
Mitsuko NISHIURA
 
Kyocera Mita Corporation
 
Reason for award: As a color reproduction method, there is a preferable color reproduction method in addition to a color reproduction method that is faithful to the original. Preferred colors are said to be associated with memory colors, but memory colors tend to differ depending on environment and culture. In this paper, in order to find out the preferred colors in different countries around the world, the author established a method for evaluating preferred colors using the “systematic arrangement method,” a sample presentation method proposed by Professor Hiroyuki Kobayashi of Chiba University. Using this evaluation method, preferred colors for skin tone, yellow, green, and blue have been identified in six countries: Japan, Italy, Germany, Sweden, the United States, and Brazil. The results show that there are regional differences in preferred colors and that the “systematic arrangement method” can be applied to surveys targeting inexperienced people who are not familiar with colors.
 

Mitsuko NISHIURA

FY 2009 (24th)

“Evaluation of Flowability of Toner Particles by Vibrating Tube Method”


 
Journal of the Imaging Society of Japan, 48(3), pp. 162-169 (2009)
 
Shuji MATSUSAKA*, Takashi SHIRAI*, Yasuyuki HOSOH*, Masatoshi YASUDA**
 
*Kyoto University, **IMP Co., Ltd.
 
Reason for award: The fluidity of the toner was evaluated by the vibrating capillary method, in which a capillary was filled with powder, the vibration intensity was increased at a constant rate, and fluidity was determined from the change in mass of the powder discharged from the bottom. Fluidity profiles were determined using 26 types of simulated toners, and the fluidity characteristics of the toners were investigated. As a result, it was found that this method allows repeated experiments in a short period of time and allows evaluation of changes in fluidity based on slight differences in toner adjustment conditions.
 

Shuji MATSUSAKA
Takashi SHIRAI
Yasuyuki HOSOH
Masatoshi YASUDA

“Photo-Induced and Dark Discharge Mechanisms of High Gamma Photoreceptors”


 
Journal of the Imaging Society of Japan, 48(3), pp. 152-161 (2009)
 
Kuniki SEINO, Ichiro YOSHIDA, Hideaki HIRAHARA, Takaaki KONUMA, Shozo KAIEDA
 
AFIT CORPORATION
 
Reason for award: An electrophotographic single-layer photoreceptor in which an X-type metal-free phthalocyanine pigment is dispersed in a polyester resin is generally referred to as a high gamma photoreceptor, and exhibits an induction effect with an inverted S-shaped light attenuation curve. This paper explains the light and dark decay characteristics of this high gamma photoreceptor using a theoretical model that takes structural traps into consideration. They proposed an analytical method to determine the structural depth of structural traps, the distance between traps, and the photocarrier generation efficiency, and confirmed that the theoretical formulas agree with experimental results for optical and dark decay in a single-layer photoreceptor.
 

Kuniki SEINO
Ichiro YOSHIDA
Hideaki HIRAHARA
Takaaki KONUMA
Shozo KAIEDA

FY 2008 (23rd)

“Reexamination of Static Charging Theories of Two-Component Developer”


 
Journal of the Imaging Society of Japan, 47(3), pp. 147-156 (2008)
 
Hisao OKADA*, Manabu TAKEUCHI**
 
*Samsung Electronics co., Ltd., ** Ibaraki University
 
Reason for award: They analyzed the relationship between the toner/carrier mixing ratio and the toner specific charge in a two-component developer, and attempted to unify the three conventional theories: contact electric field theory, surface state theory, and kinetic theory. It has been shown that the conventional contact electric field theory can be consistent with the surface state theory by considering the dielectric constants of toner and carrier. The paper was also praised for showing that surface state theory can be extended to dynamic charging equations.
 

Hisao OKADA
Manabu TAKEUCHI

“Improvement of On/Off Ratio and Frequency Response Characteristics of Vertical-Type Organic Transistor”


 
Journal of the Imaging Society of Japan, 47(2), pp. 83-88 (2008)
 
Shin-ya FUJIMOTO*, Hiroki MAEDA*, Yoshiaki TSURUOKA*, Ken-ichi NAKAYAMA**, Masaaki YOKOYAMA***
 
*Dai Nippon Printing Co., Ltd., **Yamagata University, ***Osaka University
 
Reason for award: Vertical organic transistors capable of high-speed, high-current operation are extremely important devices from both fundamental and applied perspectives. Conventional metal-based organic transistors (MBOTs) have had the problem of not achieving a large ON/OFF ratio. This paper presents a method for improving the ON/OFF ratio. In other words, by performing heat treatment after fabricating the aluminum base electrode, the off current was reduced by about three orders of magnitude, and the On/Off ratio was increased by more than 10^5. Furthermore, based on the frequency characteristics, the cutoff frequency at which the current amplification factor is 1 was estimated to be approximately 200 kHz. The above results achieved improvements in the characteristics of vertical organic transistors, and were evaluated as extremely important for practical applications.
 

Shin-ya FUJIMOTO
Hiroki MAEDA
Yoshiaki TSURUOKA
Ken-ichi NAKAYAMA
Masaaki YOKOYAMA

FY 2007 (22nd)

“Recognition Mechanism for Gold Color
—Confirmation of Necessity of Shape Recognition as a Requirement for Gold Color Recognition—”


 
Journal of the Imaging Society of Japan, 46(5), pp. 357-362 (2007)
 
Makoto OMODANI*, Satoshi KOJIMA**
 
*Tokai University, **Chiyoda Gravure Corporation
 
Reason for award: Gold as a color is similar to so-called yellow, but in order for people to judge it as gold, they have developed previous research that shows that the target area needs to be larger than a certain amount. The paper was praised for drawing clear conclusions by verifying through experiments the temporal relationship (or the order of brain processing) between shape recognition and color recognition of objects in images. Furthermore, it was praised for its potential to provide clues for establishing methods of emotional evaluation, which have been attracting attention recently.
 

Makoto OMODANI
Satoshi KOJIMA

FY 2006 (21st)

“Development of New Electron Transport Material with High Drift Mobility”


 
Journal of the Imaging Society of Japan, 45(6), pp. 521-525 (2006)
 
Takahiro FUJIYAMA, Ken-ichi SUGIMOTO, Michiru SEKIGUCHI
 
Mitsui Chemicals, Inc.
 
Reason for award: New charge transport materials have been proposed. Although it has not yet been widely used, it is highly evaluated as a proposal for a new substance.
 

Takahiro FUJIYAMA
Ken-ichi SUGIMOTO
Michiru SEKIGUCHI

“Dynamic Range Compression for Digital Video Camera Preserving High Visual Contrast by Spatially Variant Operator”


 
Journal of the Imaging Society of Japan, 45(1), pp. 22-31 (2006)
 
Yusuke MONOBE*,**, Haruo YAMASHITA*, Toshiharu KUROSAWA***, Hiroaki KOTERA**
 
*Matsushita Electric Industrial Co., Ltd., **Chiba University, ***Cousultant
 
Reason for award: They proposed a new method to address the problem that the conventional method, the Retinex model, cannot maintain the same visual contrast after conversion as the input image. The theory of the method has been sufficiently developed, and furthermore, the fact that the proposed method has been demonstrated through verification to be fully applicable to video cameras is highly praised.
 

Yusuke MONOBE
Haruo YAMASHITA
Toshiharu KUROSAWA
Hiroaki KOTERA

FY 2005 (20th)

“Generation of Charge-control Ability of Pararosaniline Due to Protonation and its Protonation Mechanism”


 
Journal of the Imaging Society of Japan,44(5), pp. 342-346 (2005)
 
Takashi MAKINO*, Yasuo IMURA*, Akio HITACHI**, Shohei IWATA*, Jin MIZUGUCHI*
 
*Yokohama National University, **Sony Corporation
 

Takashi MAKINO
Yasuo IMURA
Akio HITACHI
Shohei IWATA
Jin MIZUGUCHI

“Theoretical Analysis and Experiment of High-Resolution Development Using a Liquid toner”


 
Journal of the Imaging Society of Japan, 44(6), pp. 429-436 (2005)
 
Yasushi SHINJO, Hitoshi YAGI, Masaki TAKAHASHI, Koichi ISHII, Isao TAKASU, Masahiro HOSOYA
 
Toshiba Corporation
 

Yasushi SHINJO
Hitoshi YAGI
Masaki TAKAHASHI
Koichi ISHII
Isao TAKASU
Masahiro HOSOYA

FY 2004 (19th)

“Excitonic Interactions in Organic Pigments”


 
Journal of the Imaging Society of Japan, 43(1), pp. 10-24 (2004)
 
Jin MIZUGUCHI*, Syunji IMANAGA**
 
*Yokohama National University, **Sony Corporation
 

Jin MIZUGUCH
Syunji IMANAGA

FY 2003 (18th)

“RGB to Pseudo-Spectral Image Conversion Using Spectral Paletteand Compression by Singular Value Decomposition”


 
Journal of the Imaging Society of Japan, 42(3), pp. 215-223 (2003)
 
Hiroaki KOTERA
 
Chiba University
 
Reason for award: The author proposed a simple method to convert an RGB image to a pseudo spectral image using a spectral palette. In addition to describing the compression of spectral data, he evaluated the accuracy of color reproduction and the appearance of reproduced colors under different illumination sources based on experimental results using inkjet printing of photographic images. This method has been shown to be effective in developing new coloring materials.
 

Hiroaki KOTERA

FY 2002 (17th)

“γ Transformation by Sigmoid Function in Digital Camera Printing System”


 
Journal of the Imaging Society of Japan, 41(1), pp. 3-10 (2002)
 
Takashi WATANABE, Kengo KONNAI, Yasushi HOSHINO
 
Nippon Institute of Technology
 
Award details: In an image printing system using a digital camera, we proposed a method based on the sigmoid function, which allows easy adjustment of the conversion curve shape for tone conversion, and adjusting the curve shape of the function based on the histogram of the image. It was acclaimed as a new type of image processing, demonstrating that it could significantly improve image quality.
 

Takashi WATANABE
Kengo KONNAI
Yasushi HOSHINO

FY 2001 (16th)

“Simple Printing Process using Conductive Toner”


 
Journal of the Imaging Society of Japan, 40(4), pp. 337-344 (2001)
 
Yasuhiro FUNAYAMA, Takeshi HORI, Tomoyuki YOSHII, Tsutomu UEZONO
 
NEC Corporation
 
Award details: They proposed a new image forming method that combines a photoreceptor unit with a fine insulating grid layered on the surface of the photoreceptor and conductive toner. They demonstrated an image forming process that consists of three steps: toner focus, simultaneous exposure, and fixing.
 

Yasuhiro FUNAYAMA
Takeshi HORI
Tomoyuki YOSHII
Tsutomu UEZONO

“Wear Characteristics and Cleaning Ability of Cleaning Blades”


 
Journal of the Imaging Society of Japan, 40(4), pp. 320-329 (2001)
 
Kuniki SEINO*, Shizuo YUGE*, Masao UEMURA**
 
*Minolta Co., Ltd., **Toyohashi University of Technology
 
Award details: They discovered early on that the printing durability of cleaning blades strongly depends on the rebound resilience of the blade material, and analyzed it theoretically and experimentally from the viewpoints of tribology and rheology. The detailed mechanism of the cleaning blade’s wear life and cleaning ability was clarified.
 

Kuniki SEINO
Shizuo YUGE
Masao UEMURA

FY 2000 (15th)

“Measurements of Toner Motion in the Development Process”


 
Journal of the Imaging Society of Japan, 39(3), pp.229-240 (2000)
 
Jun HIRABAYASHI, Toru TAKAHASHI
 
Canon Inc.
 
Award details: They have developed a measurement system that visualizes the behavior of toner particles during the development process, making it possible to observe the development behavior of toner with respect to latent images and basic development phenomena. They applied this to a one-component non-contact development process to demonstrate the process of image defect generation.
 

Jun HIRABAYASHI
Toru TAKAHASHI

“Electronic structure of intermolecularly hydrogen-bonded indigo —Comparison with quinacridone and diketopyrrolopyrrole pigments—”


 
Journal of the Imaging Society of Japan, 39(2), pp.94-102 (2000)
 
Jin MIZUGUCHI, Ayae ENDO, Shinya MATSUMOTO
 
Yokohama National University
 
Award details: They investigated the electronic structure of indigo from the viewpoints of molecular structure, crystal structure, and intermolecular interactions, and clarified that the interaction between fiber moments (“exciton binding effect”) is the determining factor for the color development mechanism. The color development mechanism of hydrogen bond pigments such as indigo, quinacridone, and pyrrolopyrrole in the solid state was explained.
 

Jin MIZUGUCHI

FY 1999 (14th)

“Characteristics of Intermediate Transfer Process for a Color Electro-Photographic System”


 
Journal of the Imaging Society of Japan, 38(1), pp. 9-19 (1999)
 
Toru MIYASAKA, Masashi YAMAMOTO, Akira SHIMADA
 
HITACHI, Ltd.
 
Award details: They presented an analytical model of the transfer process in a color laser printer using an intermediate transfer body, and clarified that the relationship between the transfer time and the time constants of the intermediate transfer body layer and paper layer is important in the transfer process. Furthermore, it was shown that in an intermediate transfer process in which multiple toner layers are transferred at once, the amount of toner that can be transferred is given by the product of the amount of toner charge and the amount of adhesion.
 

Toru MIYASAKA
Masashi YAMAMOTO
Akira SHIMADA

FY 1998 (13th)

“Highly-Stable Color Laser Printer Using New Transfer Roller”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 37(2), pp. 156-166 (1998)
 
Yasuo HOSAKA, NAKAO Hideyuki
 
Toshiba Corp.
 
Award details: In the process of transferring a toner image formed on a photoreceptor using electrophotographic technology onto plain paper, a voltage is applied to a soft roller with an optimized resistance layer, which is stable even in high-temperature and humid conditions of 35°C and 85% humidity. It has been demonstrated through theory and experiments that high-quality color transfer images can be obtained.
 

Yasuo HOSAKA
NAKAO Hideyuki

FY 1997 (12th)

“Injection Photocontrol at the Metal/Organic Interface by Photochromic Compound”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 36(1), pp.5-10 (1997)
 
Hisakazu HONMA*, Masaaki YOKOYAMA**
 
*Mita Industry Co. Ltd., **Osaka Univ.
 
Award details: They have discovered that the current injected from the electrode can be optically controlled by inserting a thin film of a diarylethene derivative whose π-electron conjugation length changes significantly upon photoisomerization between the metal electrode and the organic charge transport layer.
 

Hisakazu HONMA
Masaaki YOKOYAMA

FT 1996 (11th)

“An Accurate Color Transformation Algorithm based on Flexible GCR —Accurate Printer ModeI by Neural Network—”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 35(2), pp.125-129 (1996)
 
Kazumasa MURAI, Hitshi OGATSU, Shinji KITA
 
Fuji Xerox Co., Ltd.
 
Award details: In order to accurately predict the color reproduction characteristics including GCR of a four-color printer with nonlinear response characteristics, they improved the conventional model using a neural network and analyzed the relationship between the degree of freedom of the network and the interpolation ability.
 

Kazumasa MURAI
Hitshi OGATSU
Shinji KITA

FY 1995 (10th)

“The Mechanism of Nonmagnetic Monocomponent Toner Carrying System with Micro Field-Roller”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 34(4), pp.328-336 (1995)
 
Naoki IWATA, Koji SUZUKI, Kazuhiro NISHIDO, Akira SAWADA
 
RICOH Company Ltd.
 
Award details: This paper devises a new one-component development method, conducts detailed theoretical and experimental studies, and contributes to the widespread practical application of one-component toner development in the future.
 

Naoki IWATA
Koji SUZUKI
Kazuhiro NISHIDO
Akira SAWADA

FY 1994 (9th)

“Contact Type Monocomponent Development Process Using Flexible Sleeve”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 33(1), pp. 7-14 (1994)
 
Akihito IKEGAWA, Hiroshi GOTO, Eiji IWASA, Yuji ENOGUCHI
 
Minolta Camera Co., Ltd.
 
Award details: In order to adapt the electrophotographic method to printers that mainly produce binary images, they developed a one-component contact development method – fine microtoning development method, which uses a flexible conductive sleeve to measure soft contact with the photoreceptor drum. did. As a result, it has become possible to reproduce sharp lines without the edge effects similar to printing. This method opens up a new range of applications for electrophotographic printers.
 

Akihito IKEGAWA
Hiroshi GOTO
Eiji IWASA
Yuji ENOGUCHI

FY 1993 (8th)

“A New Chargingless Electrophotographic Process”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 31(4), pp. 542-548 (1992)
 
Sachio SASAKI*, Masatoshi KIMURA*, Junzo NAKAJIMA**
 
*FUJITSU LIMITED, **FUJITSU LABORATORIES LTD.
 
Award details: They proposed a new electrophotographic method that enables full-fledged equipment that performs image exposure and development simultaneously, and ozone-free technology, and analytically derived favorable image forming conditions. Another novelty is that development and fog removal are performed using a single roller. They actually produced a prototype LED printer and verified its practicality.
 

Sachio SASAKI
Masatoshi KIMURA
Junzo NAKAJIMA

“Contact-type Monocomponent Nonmagnetic DeveIopment System (I) — Theory and Optimization —”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 31(4), pp. 531-541 (1992)
 
Masahiro HOSOYA, Mitsunaga SAITO
 
R&D Center, TOSHIBA Corporation
 
Award details: A theoretical analysis of the characteristics of a one-component non-magnetic development method using an elastic roller that holds a single layer of toner, based on experimental results and the electrical characteristics of the roller, revealed that the resistance value of the roller that provides stable high image quality is 10^5Ωm^ led that it must be less than or equal to 2. Furthermore, considering practical aspects, the optimal conditions for the development system configuration were presented.
 

Masahiro HOSOYA
Mitsunaga SAITO

FY 1991 (7th)

“Molecular Structure of Charge Control Agents (CCA) and Toner Triboelectrification: Toner Charging and the Effect of the CCA on the Water Molecule”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 30(3), pp. 282-292 (1991)
 
Norie MATSUI, Kozo OKA, Yoshihiro INABA
 
Fuji Xerox Co., Ltd.
 

FY 1989 (6th)

“Toner Layer Forming and its Method in the Mono-Component Development”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 28(1), pp. 10-19 (1989)
 
Kazuo TERAO, Shigeru INABA, Kensuke ITO
 
Fuji Xerox Co., Ltd.
 

FY 1987 (5th)

“Field Enhancement Effect Development Using Floating Electrodes”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 25(2), pp. 108-117 (1986)
 
Fuchio TAKEDA, Koji SAKAMOTO, Kazuo KOBAYASHI
 
Ricoh Company Ltd.
 

FY 1985 (4th)

“Halftone Reproduction on Digital Color Printer Based on Electrophotography (Ⅰ) —Optical Spot Distribution on Laser Beam Printer—”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 24(1), pp. 13-20 (1985)
 
Naoto KAWAMURA, Nobuo KITAJIMA, Hidejiro KADOWAKI
 
Canon Inc.
 

FY 1983 (3rd)

“Color Imaging Process Using Filter Beads”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 22(1), pp. 17-29 (1983)
 
Yuji TAKASHIMA, Eisuke ISHIDA, Shigeru TSUBUSAKI, Keiichi YUBAKAMI, Wataru SHIMOTSUMA
 
Matsushita Electric Ind. Co., Ltd.
 

“Extrinsic Carrier Photogeneratien in Poly-N-vinylcarbazole (III) —Sensitization of Poly-N-vinylcarbazole Using Intramolecular Charge Transfer Complexes—”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 21(3), pp. 169-175 (1983)
 
Shigeru SHIMOKIHARA*, Yoshiaki KATO**, Ryosuke ITAKURA***, Masaaki YOKOYAMA***, Hiroshi MIKAWA***
 
*Sumitomo Chemical Industry Company Limited, **Mita Industry Co. Ltd., ***Osaka University
 

FY 1981 (2nd)

“The Mechanism of The Canon Toner Projection Development”


 
DENSHI SHASHIN GAKKAISHI (Electrophotography), 20(1), pp. 8-17 (1981)
 
Tohru TAKAHASHI, Nagao HOSOMO, Junichiro KANBE, Tsutomu TOYONO
 
Canon Inc.
 

FY 1977 (1st)

“Comparison of Xerography with AgX Photography”


 
DENSHI SHASHIN (Electrophotography), 15(2), pp. 2_20-2_37 (1976)
 
Satoru Honjo, Sei-ichi Taguchi
 
Fuji Photo Film Co., ltd.