Exposure amount control device

Details Exposure amount control device Exposure amount control device

1981-02-04

1983-03-01

Perkey, William B.

354 24, 354 49, 354 51, G03B 7083, G03B 7093

Patent

active

043753213

ABSTRACT:
An exposure control device for use with a set of shutter blades which form a principal opening through which an exposure is made, includes a member which forms an auxiliary opening of a predetermined aperture before the shutter release starts. Upon release of the shutter, the auxiliary opening closes and thereafter opens fully in accordance with opening movement of the shutter blades so that the amount of light incident through the auxiliary opening is measured to control the exposure time through the principal opening. A time constant circuit which determines the time the shutter blades form the principal opening is arranged to start operation by detecting the variation of incident light measured through the auxiliary opening when the auxiliary opening has the predetermined aperture before shutter release, and when the auxiliary opening is brought into the closed state immediately after shutter release.

REFERENCES:
patent: 3818499 (1974-06-01), Brandt
patent: 4106040 (1978-08-01), Ito et al.
patent: 4192589 (1980-03-01), Tokutomi
patent: 4258990 (1981-03-01), Arisaka et al.

Affiliated with

Also associated with

Rating

Exposure amount control device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exposure amount control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure amount control device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1458740