Imaging device

Details Imaging device Imaging device

1993-11-29

1995-11-28

Lerner, Martin

Optical: systems and elements

Polarization without modulation

Depolarization

359497, 359498, 348342, G02B 530, G02B 2728, G02F 123

Patent

active

054713439

ABSTRACT:
An imaging device has an optical low-pass filter and a solid-state image sensor. The optical low-pass filter includes a plurality of birefringent plates. When a plurality of spaced spots formed by the birefringent plates with respect to incident light are located at adjacent positions such as to be regarded as one spot on the birefringent plates, the birefringent plates are constructed so that a phase difference between light waves passing through the plurality of spaced spots with respect to any wavelength in a visible wavelength region is larger than the wavelength. Thus, the imaging device, even when using many quartz filters, makes the intensities of the spaced spots uniform and can secure the optical low-pass filter free of dependence of wavelength.

REFERENCES:
patent: 4227208 (1980-10-01), Takanashi et al.
patent: 4575193 (1986-03-01), Greivenkamp, Jr.
patent: 4743100 (1988-05-01), Nakada et al.
patent: 4761682 (1988-08-01), Asaida
patent: 4807981 (1989-02-01), Takizawa et al.
patent: 4988171 (1991-01-01), Yokota
patent: 5069530 (1991-12-01), Nishida et al.

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