Lens position detecting device for camera

Details Lens position detecting device for camera Lens position detecting device for camera

1990-03-06

1991-06-11

Hix, L. T.

3541951, G03B 302, G03B 310

Patent

active

050236458

ABSTRACT:
A lens position detecting device comprises at least two columns of contacts each having a plurality of contacts, the columns being disposed side by side, and a brush having a plurality of brush segments each for contacting the contacts of the corresponding one of the columns and detecting a voltage at a contact thereof. Each contact of one column is shifted by a predetermined amount from the contacts of an adjacent column. The voltage at one contact is different from that at another contact of the same column, and these different voltages detectable at the contacts of one column constitute the same group as for the other columns. The lens position is determined depending on the combination of at least two voltages detected through the brush segments. The lens positions are thus divisible into a greater number of increments at the same time that the device is composed of a smaller number of elements.

REFERENCES:
patent: 4411507 (1983-10-01), Kondo
patent: 4914464 (1990-04-01), Azuma et al.

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