Optical: systems and elements – Projection screen – Rear projection screen
Reexamination Certificate
2007-07-17
2007-07-17
Perkey, W. B. (Department: 2851)
Optical: systems and elements
Projection screen
Rear projection screen
C359S457000, C359S742000, C353S033000, C353S038000, C353S081000
Reexamination Certificate
active
11486830
ABSTRACT:
A total reflecting prism portion is formed on an image generation source side of a Fresnel lens sheet which constitutes a rear projection type screen. The total reflecting prism portion is formed in an area in which the angle of incidence of a projection image projected from an optical part on the Fresnel lens sheet is at least about 40°. The total reflecting prism portion causes incident light to be outputted as output light at a predetermined output angle by a total reflection phenomenon after a first refraction phenomenon. Further, a refracting prism portion is formed on an image monitoring side of the Fresnel lens sheet. The refracting prism portion is formed in an area opposed to the portion where the total reflecting prism portion is not formed. The refracting prism portion causes incident light to be outputted as output light at a predetermined output angle by a second refraction phenomenon.
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Hirata Koji
Imafuku Daisuke
Ohishi Tetsu
Yoshikawa Hiroki
Cruz Magda
Hitachi , Ltd.
Perkey W. B.
Townsend and Townsend / and Crew LLP
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