Photography – With exposure objective focusing means – focusing aid – or... – With electronic filtering
Patent
1995-07-11
1997-02-25
Metjahic, Safet
Photography
With exposure objective focusing means, focusing aid, or...
With electronic filtering
396125, 396129, 396137, G03B 118
Patent
active
056063822
ABSTRACT:
A manual focusing circuit of a camera comprising a rotation ring having a plurality of projections, wherein the ring is manually rotated forward and rearward by a user. The manual focusing circuit further comprises a first sensing element, which is coupled to one of the projections of the rotation ring, for producing a first signal; a second sensing element, which is coupled to another of the projections of the rotation ring, for producing a second signal having a phase difference of 90 degrees against the first signal; a signal stabilizer, which is coupled to the second sensing element, for removing a noise from the second signal to produce a stabilized signal representing a rotation number of the rotation ring; and circuitry, which is coupled to the first sensing element and the signal stabilizer, for producing an output signal representing a rotation direction of the rotation ring based on the first signal and the stabilized signal.
REFERENCES:
patent: 4514075 (1985-04-01), Negishi et al.
patent: 4613224 (1986-09-01), Ogasawara
patent: 4972078 (1990-11-01), Hasebe et al.
Chapik Daniel
Metjahic Safet
Samsung Aerospace Industries Ltd.
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