Arrangement for controlling an iris to regulate light in an opti

Details Arrangement for controlling an iris to regulate light in an opti Arrangement for controlling an iris to regulate light in an opti

1994-10-11

1996-01-09

Greening, Wendy R.

Television

Camera, system and detail

Solid-state image sensor

348363, H04N 5238

Patent

active

054832802

ABSTRACT:
A light amount control apparatus including an iris (2) for adjusting an amount of a light from a lens (1) and supplying the adjusted light amount to a CCD element (3), an iris driving unit (9) for driving the iris (2), an iris position detecting unit (10) for detecting an aperture value of the iris (2), a shutter driving unit (8), and a microcomputer (11) for controlling the iris (2) through the shutter driving unit (8) and the iris driving unit (9). The aperture value of the iris (2) can be prevented from being increased after the position of the iris (2) detected by the iris position detecting unit (10) is located a little ahead of the position at which a diffraction phenomenon occurs. After the iris position detecting unit is located a little ahead of the position at which the diffraction phenomenon occurs, the aperture value of the iris (2) can be prevented from being increased. Therefore, when the cameraman takes a picture of bright scene, for example, even if the iris is closed considerably, the diffraction phenomenon can be prevented and a satisfactory shooting can be effected.

REFERENCES:
patent: 4890166 (1989-12-01), Kimura et al.
patent: 4984088 (1991-01-01), Tani et al.
patent: 5049997 (1991-09-01), Arai
patent: 5081535 (1992-01-01), Kondo et al.
patent: 5083209 (1992-01-01), Inoue et al.
patent: 5087978 (1992-02-01), Hieda
patent: 5115319 (1992-05-01), Arai et al.
patent: 5148281 (1992-09-01), Nakamura et al.
patent: 5157502 (1992-10-01), Nakajima et al.
patent: 5299015 (1994-03-01), Imaide et al.

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