Lens barrel with improved cam ring structure

Details Lens barrel with improved cam ring structure Lens barrel with improved cam ring structure

1995-11-13

1998-03-24

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359699, 359701, G02B 1514

Patent

active

057319138

ABSTRACT:
A lens barrel capable of high precision in the positional relationship of two cams by providing the two cams on one cam member is disclosed. Additionally, freedom of positioning the cams is increased by providing the two cams along a common radial line from a center line of the member while maintaining rigidity of the member. The cam member includes at least one cam groove on an inner surface and at least one cam protuberance on an outer surface for engagement with engagement members on an inner surface of a cylindrical member.

REFERENCES:
patent: 4950060 (1990-08-01), Nagasaka
patent: 5225939 (1993-07-01), Iizuka
patent: 5255124 (1993-10-01), Iwamura
patent: 5446593 (1995-08-01), Hamasaki

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