Shutter for camera

Details Shutter for camera Shutter for camera

1975-02-18

1977-04-12

Adams, Jr., Russell E.

354 23D, 354 31, 354 60A, 354234, G03B 714, G03B 708

Patent

active

040178722

ABSTRACT:
The invention discloses a shutter for a camera of the type comprising a light control mechanism which comprises a plurality of shutter blades, which may also function as the aperture control diaphragm, and driving means such as a stepping motor for intermittently driving the shutter blades to open and close them in response to shutter driving pulse signals; a circuit for generating the shutter blade driving pulse signals with a frequency or pulse spacing determined in response to the brightness of a subject; a circuit for reversing the direction of drive of the driving means a predetermined time, which is dependent upon the brightness of the subject, after the shutter blades are started to open; a circuit for controlling the frequency or pulse spacing of the driving pulse signals; and a driving circuit for controlling the driving means in response to the outputs of the pulse generating circuit and of the driving direction reversing circuit.

REFERENCES:
patent: 3709137 (1973-01-01), Starp
patent: 3813680 (1974-05-01), Wagensonner
patent: 3833913 (1974-09-01), Wick et al.
patent: 3842587 (1974-10-01), Strauss et al.
patent: 3882522 (1975-05-01), Erlichmann
patent: 3900855 (1975-08-01), Stempeck
patent: 3903528 (1975-09-01), Kee

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