Patent
1974-10-16
1976-11-02
Hix, L. T.
354 60R, 354 60E, 354272, G03B 720
Patent
active
039900851
ABSTRACT:
A single lens reflex camera of the TTL light measuring type and mounting interchangeable objective lenses of the fully open and stopped down aperture light measuring type includes a two coil differential meter. One of the meter coils is connected through a photocell to a battery and the other coil is connected between the battery grounded first terminal and the arm of a double throw switch. An adjustable first resistor is connected between the switch first contact which is grounded through a normally open second switch and an objective aperture varied second resistor is connected between the battery ungrounded terminal and the first switch second contact. The open aperture light measuring objective lens is provided with an actuating element which functions upon mounting of the lens to close the second switch to short circuit the second coil when the first switch first contact is closed, thereby disabling the light measuring circuit and providing an indication thereof.
REFERENCES:
patent: 3465661 (1969-09-01), Hahn et al.
patent: 3470807 (1969-10-01), Uno
patent: 3486434 (1969-12-01), Suzuki et al.
patent: 3589252 (1971-06-01), Hahn et al.
patent: 3603234 (1971-09-01), Strehle et al.
patent: 3721168 (1973-03-01), Noack et al.
patent: 3785266 (1974-01-01), Watanabe
Asahi Kogaku Kogyo Kabushiki Kaisha
Hix L. T,.
LaBarre James
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