Optical low pass filter and imaging device using the same

Details Optical low pass filter and imaging device using the same Optical low pass filter and imaging device using the same

1993-11-03

1995-11-14

Dzierzynski, Paul M.

Optical: systems and elements

Glare or unwanted light reduction

With absorption means

359603, 359884, G02B 508, G02B 526

Patent

active

054672244

ABSTRACT:
To effectively cut off false signals and false color signals which would occur in an imaging device and also to suppress a reduction in quality of images which would result from a generation of a ring-shaped flare, an optical low pass filter comprises a transparent substrate having first and second surfaces opposite to each other. The optical low pass filter is adapted to be disposed between a photo-taking lens and a solid-state imaging element with the first surface confronting the solid-state imaging element. The first surface of the transparent substrate is formed with a diffraction grating. The transparent substrate used in the optical low pass filter is so designed and so structured as to have a thickness (mm) which satisfies the equation, 2.multidot.g.multidot.tan (.theta.1)+2.multidot.t.multidot.tan (.theta.c)<0.9, wherein g represents the distance of spacing between the first surface of the transparent substrate and an image plane of the solid-state imaging element; .theta.c represents the critical angle at the second surface of the transparent substrate; and .theta.1 represents the angle of emission of a first-order diffracted light which takes place when light passing through the transparent substrate is incident on the first surface at the critical angle .theta.c.

REFERENCES:
patent: 4795236 (1989-01-01), Ise
patent: 4998800 (1991-03-01), Nishida et al.

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