The surface of spherical, positively chargeable acrylic resin core particles (diameter : 10μm)is separately covered, by means of a coacervation process, with two types of negatively chargeable ultra-fine particles(diameter : 3nm or 60nm) in water to obtain two types of surface-treated particles. The surface structure and tribo-charging characteristics of the obtained particles are investigated, respectively, using SEM observation and the amount of tribo-charge q/m that was generated between the surface-treated particles and ferrite carrier particles.
The SEM observation demonstrates that both types of ultra-fine particles uniformly cover the core particle surface. Further, measurement of q/m values shows that the cover layer has negative charge impartation capability and that the amount of negative charge-q/m increases with the increase of coverage by the ultra-fine particles. From the surface morphology and q/m value for various covering ratios by the ultra-fine particles and mixing time with the ferrite carrier, the charging characteristics and surface structure of the obtained surface-treated particles are discussed.

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A function of toner is closely related to the three-dimensional reconstruction of toner-constituent, so there is a demand to develop a means of an observation of the reconstruction precisely.
And, the observation contributes to develop a new toner having high performance required by any demand nowadays-high resolution, durability, corresponding to ecology for example. In this study, we proposed the three methods of three-dimensional analysis of dispersed toner-materials.
Especially, we have found out the Ultra high voltage electron microscopy is so useful as a result of our investigation focused onto the three-dimensional observations. The feature of the Ultra high voltage electron microscopy is based on a manner as non-destructive and successive inspection.

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Silver halide photographic materials have been constantly improved for better image quality, light sensitivity, and cost performance, to the limit. Furthermore, we have succeeded in making photography familiar to everyone by infrastructure development through the simplification and automation of photography, and through the improvement in productivity of lab processing, etc. Although recently various image input/output devices have been developed with the progress of digital technology, the infrastructure and services which have been built for silver halide photography can be utilized as they are, and in addition, the know-how collected through the development of silver halide materials is currently utilized for various digital equipment. Imaging technologies and service infrastructures built with siver halide photography will continue to progress with the furthering advances in digital technology, and contribute to development of photographic culture.

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As far as image print quality is concerned, inkjet photo printer was inferior to sliver halide photo printer. Since the second half of 1990s, however, the situation has been dramatically improved with technical challenges by imaging engineers and scientists, who have envisioned a day to catch up and overwhelm sliver halide's advanced quality. Now none in the photographic industry doubts that inkjet photo printing is the strongest competitor to sliver-halide photo printing.
This paper describes on a brief history of inkjet technology over the last ten years. The paper also explains about some fundamental technologies including print head, inkjet ink, print media, and image processing based on the inkjet chronology.

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The image quality improvement of the printed matter by electrophotography is splendid in recent years. On the other hand, the number of chances to “release the shutter” shows dramatic increase with digitization. There is no doubt about that photography output volume from electrophotographic multi-functional printers (MFP) also increases with the market. In this report, it will be explained the usefulness of the photo finished output by the electrophotographc MFP, problem to be implemented, and innovative cold release technology MACS. Future is undiscovered, however the best way to predict the future is to invent it.

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In recent years, thermal dye transfer system has been recognized as a convenient method to print digital photographs. This system can produce high quality images that are comparable to silver halide system.
In order for thermal dye transfer technology to be as widely used as silver halide to print digital photographs, further development of high quality print media is required. In particular, high image quality, long print durability and high speed print systems are needed in the world-wide market. This report introduces the material technological trend that we have been researching about the improvement of the high-speed print aptitude, the image quality and the durability requested from the market.

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ZINK “Zero Ink” technology, it is possible to do single-pass direct thermal printing in full color. We examined simulation of full color thermal printing. We reported thermal head design by automatic iterative calculation of two-dimensional heat conduction analysis. This time, by enhancing an analytical model to three dimensions, we became possible the simulation of the temperature distribution not only in direction of Zink paper transportation and depth but also in in-plane each layer. As a result, the relation between the structure of thermal head and the internal temperature distribution of Zink paper was clarified. We examined the thermal head structure that is appropriate for full color thermal print by using this analytical model.

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Ag-X photographic process print have good futures for color productivity and durability, and are pronominal of “Photograph” until now. On the other hand, digital process on photo imaging is making rapid progress, many method, for example, inkjet, electronic photograph and thermal transfer become to furnish high quality print, draw near Ag-X photographic process print in quality, then the market of “Digital Print” was born and expanding. In this chapter, to compare of Ag-X photographic process print and digital print as to printing media is discussed.

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