Image sensing apparatus

Details Image sensing apparatus Image sensing apparatus

1989-04-11

1990-04-10

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

35821313, G03B 708, H04N 314

Patent

active

049164775

ABSTRACT:
An image sensing apparatus having a diaphragm of a normally closed type for controlling the entrance of light into an image sensor. The diaphragm is opened from a fully closed state to a predetermined aperture value based on the output of a light measuring element other than the image sensor and is closed again when a first exposure operation is carried out, and then it is opened from the fully closed state to another predetermined aperture value which is based on the signal formed by the image sensor during the first exposure operation and is closed again when a second exposure operation is carried out. An electrical signal formed by the image sensor during the second exposure operation is recorded as a still picture signal, thus giving an advantage that the aging change of the diaphragm and the tolerance of the exposure can be canceled.

REFERENCES:
patent: 4734777 (1988-03-01), Okino et al.

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