|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||382/124 ; 382/126 ; 382/127|
|§371/§102 date||19971222 (19971222)|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 50 인용 특허 : 2|
A method and ultra-compact system has been developed for illuminating and detecting the surface topography of an object such as the finger (4) of an individual. The system (8) is capable of producing high-contrast images which can be electronically transmitted in real-time, or stored using electronic or photographic recording devices. Light traveling within a light transmitting substrate (2) is redirected by a slanted-fringed light diffractive grating preferably embodied within a volume hologram (3). The volume hologram (3), either of the reflection or t...
[ What is claimed is:] [1.] A device of compact construction for producing an image of the topographical surface structure of an object, comprising:a light transmitting substrate having an index of refraction N1, capable of transmitting light;an object illuminating region for illuminating an object in proximity therewith;an optical element having an index of refraction N2 and embodying a light-diffractive grating, said optical element being affixed to a portion of said light transmitting substrate, and disposed about an optical axis passing through said ...