Still picture imaging apparatus having an improved automatic exp

Details Still picture imaging apparatus having an improved automatic exp Still picture imaging apparatus having an improved automatic exp

1992-10-15

1994-08-23

Groody, James J.

Television

Camera, system and detail

Solid-state image sensor

348363, 348299, H04N 5238

Patent

active

053412206

ABSTRACT:
A still picture imaging apparatus including a photometer amplifier (4) for measuring a photo current flowing into an overflow drain of a CCD imaging device (3), an aperture stop mechanism (2) for adjusting the incident light quantity of the imaging device, and a command unit (8, 9) for producing a command signal to start an imaging operation whereby a light quantity measurement on the basis of the photo current is effected during a non-operated condition of the imaging device and then the imaging operation of the imaging device is started in response to the command signal from the command unit (8, 9). The apparatus further includes an aperture stop control circuit (5) whereby in accordance with a reference value representing an incident light quantity which provides a proper exposure when the imaging device (3) is exposed to light over a predetermined shutter time the aperture stop mechanism (2) is feedback controlled in accordance with a measured light quantity signal from the photometer amplifier (4) in such a manner that the measured light quantity signal becomes equal to the reference value, an aperture stop fixing mechanism (11) for mechanically fixing the aperture stop opening of the aperture stop mechanism (2) under the control of the aperture stop control circuit (5) immediately before the start of the imaging operation in response to a command signal from the command unit (8, 9), and an output control circuit (6) for outputting from the imaging device (3) a video output signal imaged with the predetermined shutter time after the aperture stop opening has been fixed.

REFERENCES:
patent: 4365272 (1982-12-01), Nagai
patent: 4516172 (1985-05-01), Miyata
patent: 4558368 (1985-12-01), Aoki
patent: 4638350 (1987-01-01), Kato
patent: 4754333 (1988-06-01), Nara
patent: 4760452 (1988-07-01), Kaneko
patent: 4809076 (1989-02-01), Todaka
patent: 4868667 (1989-09-01), Tani
patent: 4975778 (1990-12-01), Park
patent: 5005086 (1991-04-01), Iwamoto
patent: 5012271 (1991-04-01), Nishimura

Affiliated with

Also associated with

Rating

Still picture imaging apparatus having an improved automatic exp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Still picture imaging apparatus having an improved automatic exp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Still picture imaging apparatus having an improved automatic exp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-506670