Dual function exposure time display and control circuit for SLR

Details Dual function exposure time display and control circuit for SLR Dual function exposure time display and control circuit for SLR

1976-12-13

1978-05-09

Hix, L. T.

354 60E, G03B 708, G03B 700

Patent

active

040890155

ABSTRACT:
A light meter circuit for an SLR camera implements full aperture viewfinding with a preselected exposure time by providing an integrating capacitor 25 for controlling the exposure time, a first switch 24 for enabling the charging of the capacitor, circuit means 26, 29 for controlling the charging of the capacitor, a variable resistor 30 for establishing the lens aperture value in an exposure time display mode, a fixed resistor 31 for establishing the aperture value in an exposure time control mode, and a second switch 32 for connecting one of the resistors to an input of the charging control circuit. When the shutter release button is depressed the second switch is transferred from the variable to the fixed resistor, and the first switch is subsequently opened to enable the charging of the capacitor.

REFERENCES:
patent: 3842424 (1974-10-01), Tsunekawa et al.

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