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Featured researches published by Norihito Nakazawa.


Proceedings of SPIE | 1998

Application of DuPont photopolymer films to automotive holographic display

Norihito Nakazawa; Motoshi Ono; Shoichi Takeuchi; Hiromi Sakurai; Masahiro Hirano

Automotive holographic head-up display (HUD) systems employing DuPont holographic photopolymer films are presented. Holographic materials for automotive application are exposed to severe environmental conditions and are required high performance. This paper describes the improvement of DuPont photopolymer films for the automotive use, critical technical issues such as optical design, external color and stray light. The holographic HUD combiner embedded in a windshield of an automobile has peculiar problems called external color. Diffraction light from holographic combiner makes its external color tone stimulative. We have introduced RGB three color recording and color simulation in order to improve the external color. A moderate external color tone was realized by the optimization in terms of wavelengths and diffraction efficiencies of the combiner hologram. The stray light called flare arises from a reflection by glass surface of windshield. We have developed two techniques to avoid the flare. First is a diffuser type trap beam guard hologram which reduces the intensity of the flare. Second is the optimization of the design of hologram so that the incident direction of flare is lower than the horizon line. As an example of automotive display a stand-alone type holographic HUD system attached on the dashboard of an automobile is demonstrated, which provides useful driving information such as route guidance. The display has a very simple optical system that consists of only a holographic combiner and a vacuum fluorescent display. Its thin body is only 35 mm high and does not obstruct drivers view. The display gives high contrast and wide image.


electronic imaging | 1997

IDT-SEM observation of fringe pattern in volume hologram and its application to multicolor recorded HOEs

Motoshi Ono; Misato Uchida; Akio Masui; Norihito Nakazawa; Hiromi Sakurai; Masahiro Hirano

Photopolymer films developed by DuPont have excellent features as volume hologram recording material including high resolution, high diffraction efficiency, full color recording capability and fabrication with all dry processing. We have prepared several types of HOEs by using the films to implement designed function such as high power, multi-color recording and controlling of the diffraction bandwidth. To accomplish them, direct and precise knowledge of the fringe pattern such as slant angle and fringe space was strongly required. We have developed a new technique for the observation of the fringe pattern by scanning electron microscope (SEM) with an aid of Iodine dying pre-treatment (IDT-SEM). It is thought that Iodine is preferentially adsorbed at double bondings in unpolymerized monomers, which leads to a presumption that Iodine distribution detected by SEM accurately reproduce the refractive index modulation in volume hologram. This has been confirmed experimentally by the observation that fast Fourier transform analyses of SEM images for single, two and three color recorded HOEs are good agreement with optical spectra of the HOEs. The SEM image provides us the spatial information of both fringe space and slant angle with good resolution. This technique has been further applicable to other type of HOEs.


Archive | 2004

Polishing compound, method for production thereof and polishing method

Satoshi Takemiya; Norihito Nakazawa; Yoshinori Kon


Archive | 2001

Holographic display device and method for producing a transmission diffusion hologram suitable for it

Motoshi Ono; Norihito Nakazawa


Archive | 1997

Head-up display, a combiner used for the head-up display and a method of designing the head-up display

Norihito Nakazawa; Masahiro Hirano


Archive | 1994

Head-up display and a combiner used to control diffraction of light including a hologram with a half width between 200-400 nm

Norihito Nakazawa; Shoichi Takeuchi; Hiroaki Shimozono; Yuji Aizawa


Archive | 2005

SEMICONDUCTOR POLISHING COMPOUND, PROCESS FOR ITS PRODUCTION AND POLISHING METHOD

Yoshinori Kon; Norihito Nakazawa; Chie Ishida


Archive | 2008

POLISHING COMPOSITION, POLISHING METHOD, AND METHOD FOR FORMING COPPER WIRING FOR SEMICONDUCTOR INTEGRATED CIRCUIT

Iori Yoshida; Hiroyuki Kamiya; Satoshi Takemiya; Atsushi Hayashi; Norihito Nakazawa


Archive | 2003

Semiconductor abrasive, process for producing the same and method of polishing

Yoshinori Kon; Norihito Nakazawa; Chie Ishida


Archive | 2011

ABRASIVE, POLISHING METHOD, METHOD FOR MANUFACTURING SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE

Masaru Suzuki; Norihito Nakazawa

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