Optical: systems and elements – Holographic system or element – Having multiple object beam or diffuse object illumination
Patent
2000-02-29
2000-12-19
Schuberg, Darren
Optical: systems and elements
Holographic system or element
Having multiple object beam or diffuse object illumination
359 1, G03H 102
Patent
active
061633909
ABSTRACT:
A method for producing a hologram recording an interference fringe formed by an object light and a reference light on a photosensitive dry plate, and the object light either having diffusing and scattering characteristics or being passed through an optical diffusion body, mainly includes the following steps: In a first step, a ratio .eta..sub.R0 /.eta..sub.00 of a first diffraction efficiency .eta..sub.00 and a second diffraction efficiency .eta..sub.R0, is calculated. The diffraction efficiency .eta..sub.00 is dependent on two object light beams. The efficiency .eta..sub.R0 is dependent on the object light and the reference light. In a second step, the intensity E.sub.O of the object light and the intensity E.sub.R of the reference light is adjusted in such a way that the ratio .eta..sub.R0 /.eta..sub.00 is set to at least 10 and the efficiency .eta..sub.00 does not exceed 5%.
A display device using the above hologram is structured by a display unit for generating a signal light; a hologram screen formed by either reflection or transmission hologram, and a projecting unit for projecting the signal light to the hologram screen.
According to the present invention, it is possible to easily produce a hologram, for example, a screen hologram, having no cloudiness or cloudy state when an observer observes an image displayed on the screen, and to a display device using the above hologram screen.
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Ishizuka Atsuo
Kamiya Katsumi
Kanda Tomoyuki
Koie Kazutoshi
Nishii Katsuyoshi
Denso Corporation
Nippon Soken Inc.
Schuberg Darren
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