Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-03-11
1984-11-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
35016222, 35016223, H01J 314
Patent
active
044840721
ABSTRACT:
Disclosed is a device for splitting incident light on an image forming optical system by means of a relief type diffraction lattice and for detecting a portion of the light. The device is constructed with a transparent substrate, on one surface of which there is formed the relief type diffraction lattice which satisfies the condition of N.lambda..perspectiveto.2n.DELTA. (where N is an integer; .lambda. is a wavelength contained in the incident light; n denotes a refractive index of the transparent substrate; and .DELTA. represents a quantity between peak and valley on the surface of the relief type diffraction lattice), a reflective film coated on the lattice surface, a transparent filling layer having the substantially same refractive index as that of the transparent substrate, which perfectly fills the peak and valley (or surface irregularity) of the relief type diffraction lattice, and light detectors. With this construction, the incident light is split by diffraction without undesirably effecting the image-formation, and the thus diffracted light is detected by the light detectors.
REFERENCES:
patent: 4129382 (1978-12-01), Greenaway
patent: 4174894 (1979-11-01), Fukuhara et al.
patent: 4215924 (1980-08-01), Matsumoto
patent: 4222633 (1980-09-01), Hock
Canon Kabushiki Kaisha
Nelms David C.
LandOfFree
Device for detecting a portion of light incident on an image for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for detecting a portion of light incident on an image for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for detecting a portion of light incident on an image for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2190647