Back to results
US 5,124,545 AGranted
Light-to-light conversion element provided with wavelength selecting reflection layer and imaging device provided with the light-to-light conversion element
AssigneeVictor Company of Japan, Ltd.
InventorsItsuo Takanashi, Shintaro Nakagaki, Hirohiko Shinonaga
Life of this patent
Estimating the term…
Abstract
A light-to-light conversion element which includes at least a photoconductive layer and a photo-modulation layer and in which light incident on these layers is reflected by a reflection layer and in which a selective reflection characteristic corresponding to color separation is given to the reflection layer. Thereby, among the light incident on the photoconductive layer and the photo-modulation layer, light having wavelength of the specific region is selectively reflected by the reflection layer, so that the write and read operation of information is performed on the selected light.
Claims12
A light-to-light conversion element for use in an image displaying or sensing device, comprising:
- a photoconductive layer responsive to a first incident light, which includes image information to be written thereinto, thereon for generating electric charge corresponding to the quantity of the incident light;
- a photo-modulation layer for modulating a second incident light thereon, for reading written image information, by using electrooptic effects corresponding to influence of an electric field caused by the electric charge generated in said photoconductive layer;
- and
- a light reflecting layer interposed between said photoconductive and photo-modulation layers and having a predetermined selective reflection characteristic corresponding to color separation of the second incident light for reflecting the second incident light, wherein
- each of said photoconductive layer and said photo-modulation layer has a transmission characteristic by which each of said photoconductive layer and said photo-modulation layer can transmit light of wavelength of a range being broader than a range of wavelength of light reflected by said light reflecting layer.
2 more elements
An image displaying apparatus including:
- first, second and third light-to-light conversion elements each having a photoconductive layer responsive to light for generating an electric charge corresponding to quantity of the light, a photo-modulation layer for modulating received light by using electrooptic effects corresponding to influence of an electric field caused by the electric charge generated in said photoconductive layer and a light reflecting layer integrated between said photoconductive and photo-modulation layers and having a predetermined selective reflection characteristic for selectively reflecting light, said reflecting layer of said first light-to-light conversion element having a selective reflection characteristic to reflect red light, said reflecting layer of said second light-to-light conversion element having a selective reflection characteristic to reflect green light, said reflecting layer of said second light-to-light conversion element having a selective reflection characteristic to reflect blue light;
- and
- color separation means for effecting the color separation of first incident light, which includes image information to be written into said first, second and third light-to-light conversion elements, and second incident light used for reading the written image information to obtain red, green and blue composing light, for introducing the red, green and blue composing light to said photo-modulation layers of said first, second and third light-to-light conversion elements, respectively, and for receiving and transmitting light reflected by said photo-modulation layers of said first, second and third light-to-light conversion elements.
An image displaying apparatus including:
- a first, second and third light-to-light conversion element each having a photoconductive layer responsive to light for generating an electric charge corresponding to the quantity of the light, a photo-modulation layer for modulating received light by using electrooptic effects corresponding to influence of an electric field caused by the electric charge generated in said photoconductive layer and a light reflecting layer interposed between said photoconductive and photo-modulation layers and having a predetermined selective reflection characteristic for selectively reflecting the light, said reflecting layer of said first light-to-light conversion element having a selective reflection characteristic to reflect red light, said reflecting layer of said second light-to-light conversion element having a selective reflection characteristic to reflect green light, said reflecting layer of said second light-to-light conversion element having a selective reflection characteristic to reflect blue light;
- image information input means for introducing red, green and blue write light, each of which includes image information to be written into said first, second and third conversion means, to said first, second and third conversion means, respectively;
- and
- color separation means for effecting the color separation of first incident light used for reading the written image information to obtain red, green and blue read light and introducing the red, green and blue read light to said first, second and third light-to-light conversion elements, respectively, and for receiving and transmitting light reflected by said photo-modulation layers of said first, second and third light-to-light conversion elements.
1 more element
Dependencies are inferred from the claim text.