Photographing apparatus having optical low-pass filter

Details Photographing apparatus having optical low-pass filter Photographing apparatus having optical low-pass filter

1994-07-01

1995-11-28

Lerner, Martin

Optical: systems and elements

Diffraction

From grating

354101, 354102, 359568, 359569, 359574, 359891, G02B 518, G02B 520, G02B 2744, G03B 3300

Patent

active

054713447

ABSTRACT:
A photographing apparatus comprising an optical low-pass filter of phase grating type in which a plurality of prism portions, convex or concave in cross section, are arrayed in succession at a predetermined pitch, the arrangement being such that the aperture center or the optical axis of a photo taking lens is located substantially at an apex position of a concave or convex portion which is formed by a prism portion and its adjacent prism portion.

REFERENCES:
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patent: 2182993 (1939-12-01), Moreno
patent: 2189751 (1940-02-01), Bocca et al.
patent: 2733291 (1956-01-01), Kell
patent: 3716666 (1973-02-01), Larsen
patent: 3821795 (1974-06-01), Okano
patent: 3940788 (1976-02-01), Abe et al.
patent: 4083627 (1978-04-01), Okano
patent: 4384210 (1983-05-01), Stauffer
patent: 4795236 (1989-01-01), Ise
patent: 5016954 (1991-05-01), Onayama et al.
patent: 5081545 (1992-01-01), Sugawara et al.

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