Device for shifting lens group

Details Device for shifting lens group Device for shifting lens group

1981-05-28

1984-01-03

Perkey, William B.

350255, 350400, G03B 310, Go2B 711

Patent

active

044239416

ABSTRACT:
A lens shifting device comprising a stationary cylinder having a mounting means adapted to engage with a mating means of a main body of an equipment which uses an optical lens assembly which must be shifted for focusing, an inner cylinder which is slidably fitted into the stationary cylinder and in which is securely mounted a lens group, contact members is slidable contact with the inner cylindrical surface of the stationary cylinder, one of which is interconnected with the inner cylinder coaxially, locking means adapted to cause the contact members to lock to said stationary cylinder, and expandable-and-collapsible means interconnecting between the contact members. The inner cylinder is caused to slide step by step relative to the stationary cylinder in the axial direction thereof and forward or backward by activating the locking means and the expandable-and-collapsible means by desired timing relationship. The device is very simple in construction, but highly reliable and dependable in operation.

REFERENCES:
patent: 4083057 (1978-04-01), Quinn
patent: 4291958 (1981-09-01), Frank et al.
patent: 4303324 (1981-12-01), Marcus

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