Camera having auto-trim exposure control

Details Camera having auto-trim exposure control Camera having auto-trim exposure control

1988-10-17

1989-10-24

Adams, Russell E.

354483, G03B 708

Patent

active

048765660

ABSTRACT:
An exposure control system in a self-developing camera having a user trim adjustment for manually varying the exposure time of a picture over a limited range of exposure times is provided with a photocell for measuring the level of ambient light in a scene to be photographed and a memory for temporarily storing this scene light information. If after taking a picture of a particular scene the camera operator determines that the resulting photograph was either too light or too dark and chooses to take another picture of the particular scene, the trim control is manually adjusted to obtain the desired picture brightness level. In the present arrangement, when the particular scene is re-framed and the trim control is adjusted, the ambient scene light information stored in memory is varied, and not the ambient scene light subsequently sensed by the photocell in order to compensate for the fact that upon re-framing the scene the photocell sees a different portion of the same scene and therefore a different ambient scene light level and that the intent of the operator in such instances is to alter the exposure time relating to the initial scene that produced the unwanted scene light conditions and not that relating to the re-framed scene.

REFERENCES:
patent: 3620143 (1971-11-01), Burgarella
patent: 3942183 (1976-03-01), Whiteside
patent: 4199244 (1980-04-01), Shenk
patent: 4199246 (1980-04-01), Muggli
patent: 4209243 (1980-06-01), Johnson et al.
patent: 4209506 (1980-06-01), Johnson et al.
patent: 4342506 (1982-08-01), Johnson et al.
patent: 4717935 (1988-01-01), Anacreon

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