Light intercepting device in lens barrel

Details Light intercepting device in lens barrel Light intercepting device in lens barrel

1990-02-05

1991-07-23

Arnold, Bruce Y.

350429, 350580, 354400, G02B 702

Patent

active

050338196

ABSTRACT:
A lens barrel includes a control unit which has an operation pin which is moved in the circumferential direction by an angular displacement corresponding to an object distance signal generated by an object distance measuring device. A lens frame carries a focusing lens group and is screw-engaged by the control unit to be engaged by the operation pin so as to move together therewith in the circumferential direction. An annular member moves substantially together with the control unit in the optical axis direction and is located in front of the lens frame of the focusing lens group. The light intercepting device includes a first light intercepting cylindrical portion which is provided on the annular member to extend to the outer periphery of the focusing lens group, or the vicinity thereof, and a second light intercepting cylindrical portion which is provided on the lens frame of the focusing lens group to always at least partially overlap the first light intercepting cylindrical portion in the optical axis direction.

REFERENCES:
patent: 2254537 (1941-09-01), Nerwin
patent: 3809459 (1974-05-01), Wakamiya et al.
patent: 4002402 (1977-01-01), Mito
patent: 4183661 (1980-01-01), Ohkura
patent: 4214829 (1980-07-01), Ohashi
patent: 4382661 (1983-05-01), Kamata
patent: 4441794 (1984-04-01), Field
patent: 4472033 (1984-09-01), Fukuhara et al.
patent: 4730901 (1988-03-01), Suzuki et al.
patent: 4793689 (1988-12-01), Aoyagi et al.
patent: 4911542 (1990-03-01), Nishio et al.

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