Self calibration circuit for a camera

Details Self calibration circuit for a camera Self calibration circuit for a camera

1995-03-31

1997-07-15

Adams, Russell E.

Photography

With film drive

Double exposure prevention

396319, G03B 1902, G03B 1724

Patent

active

056492537

ABSTRACT:
An event detection circuit and method of operation thereof in a calibration mode and in a normal operating mode particularly for use in photographic cameras in relation to the calibration of sensors and the detection of output signals therefrom for use in controlling camera operations. An event detection circuit comparator is used in the calibration mode with a successive approximation A/D converter register which generates test analog signals applied to a second input terminal of the comparator while the sensor test output signal generated under the calibration test conditions is applied to the first input terminal to measure and digitize the sensor test analog output signal level as a digital threshold. Then, in the normal operating mode, the digital threshold is retrieved and substituted for the successive approximation A/D converter register to generate a threshold analog signal applied to the second input terminal while the sensor analog output signal is applied to the first input terminal.

REFERENCES:
patent: 4314235 (1982-02-01), Ruf et al.
patent: 4423934 (1984-01-01), Lambeth et al.
patent: 4498140 (1985-02-01), Hull
patent: 4629304 (1986-12-01), Saegusa
patent: 4996549 (1991-02-01), Yamaguchi
patent: 5084754 (1992-01-01), Tomitaka
patent: 5097283 (1992-03-01), Kazumi
patent: 5229810 (1993-07-01), Cloutier et al.
patent: 5268562 (1993-12-01), Lazaridis
patent: 5291112 (1994-03-01), Karidis et al.
patent: 5371691 (1994-12-01), Seki et al.
patent: 5448430 (1995-09-01), Bailey et al.
patent: 5477286 (1995-12-01), Ohkawa
patent: 5508767 (1996-04-01), Kazumi et al.
patent: 5521666 (1996-05-01), Kazami
patent: 5530503 (1996-06-01), Takahashi et al.
Mitsubishi Electronics America, Inc., "Microcontroller User's Manual", pp. 64-68, (Apr., 1991).
Schilling, Belove, Electronic Circuits: Discrete and Integrated, pp. 719-723, McGraw-Hill, Inc. (1979).
Horowitz, Hill, The Art of Electronics, 2nd. ed., pp. 622-624, Cambridge University Press.

Affiliated with

Also associated with

Rating

Self calibration circuit for a camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Self calibration circuit for a camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self calibration circuit for a camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1500967