Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-10-23
1993-08-03
Razavi, Michael T.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358225, 250204, 359723, H04N 5232, G02B 1316, G01J 136
Patent
active
052334317
ABSTRACT:
An image pickup device which, in placing a phase type optical low pass filter in front of a taking lens, is able to cope with the varying focal distances of the taking lens only by a single piece of phase type optical low pass filter and which is also able to obtain a large quantity of information to be used for focusing detection in the auto focusing (AF) operation. The image pickup device is composed of a taking lens having a variable focal distance, a solid state image pickup element on which an object light image is formed through the taking lens, a phase type optical low pass filter which is disposed in front of the taking lens in a freely rotatable manner, and a device for rotating the phase type optical low pass filter according to the focal distances of the taking lens so as to be able to remove a given spatial frequency component corresponding to the pixel pitch of the solid state image pickup element. The image pickup device further includes a device which, when an AF detect circuit executes a focusing detection operation, rotates the optical low pass filter 90.degree. from a state in which the spatial frequency component in the horizontal direction can be removed, or retreats the optical low pass filter from a photograph optical system, and also which returns the optical low pass filter to its original state when photographing.
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Asami Katuo
Kaneko Kiyotaka
Kawaguchi Ryuji
Orimoto Masaaki
Takatori Naoki
Colaianni Joseph
Fuji Photo Film Co. , Ltd.
Razavi Michael T.
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