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Patent Searching and Data


Title:
OPTICAL LOW-PASS FILTER AND IMAGE PICKUP DEVICE
Document Type and Number:
Japanese Patent JPH0675190
Kind Code:
A
Abstract:

PURPOSE: To suppress the deterioration of image quality caused by the occurrence of ring-like flare while a forgery signal and a false chrominance signal are effectively cut off.

CONSTITUTION: This is the optical low-pass filter 2 provided with a diffraction grating part 2a and obtained by arranging the grating part 2a between a photographing lens 1 and a solid image pickup element 4 so as to be faced to the element 4. Then, a total reflecting layer 3 which is provided with a refractive index different from the refractive index of the grating part 2a and whose surface 3a faced to the element 4 is flat is laminated on the element 4 side of the grating part 2a. Besides, the optical low-pass filter 2 is provided and the filter 2 and the element 4 are integrated with a spacer intervening between them.


Inventors:
ONISHI IKUO
Application Number:
JP1992000230153
Publication Date:
March 18, 1994
Filing Date:
August 28, 1992
Export Citation:
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Assignee:
KURARAY CO
International Classes:
G02B27/46; H04N5/225; H04N9/09; H04N9/097; G02B27/00; (IPC1-7): G02B27/46; H04N5/225; H04N9/09; H04N9/097