Lens barrel, photographic apparatus, and optical apparatus

Details Lens barrel, photographic apparatus, and optical apparatus Lens barrel, photographic apparatus, and optical apparatus

2007-03-20

2007-03-20

Perkey, W. B. (Department: 2851)

Photography

Having variable focal length of camera objective

Lens moves in or out of light path

C396S349000, C359S817000

Reexamination Certificate

active

10968355

ABSTRACT:
A lens barrel has its collapsed length which can be further decreased and its extended length which can be further increased. A photographic apparatus incorporates the lens barrel into its body. A lens barrel is equipped with a first gear which is rotatably supported by a straight-ahead key ring and rotates being driven by rotation of a middle tube and a second gear which receives driving force from the first gear and retracts a second lens group to a predetermined retracted position off the optical axis of a zoom lens during collapse and advances the second lens group onto the optical axis during extension. The second gear lacks teeth in that part which faces the first gear when the second lens group is at the retracted position during collapse. Consequently, the first gear runs idle while facing that part thereby holding the second lens group at the retracted position.

REFERENCES:
patent: 4721972 (1988-01-01), Wakabayashi
patent: 6944396 (2005-09-01), Ito et al.
patent: 2003-295031 (2003-10-01), None
http://www.business-i.jp/sentan/jusyou/2003/pentax/, with 19 pages of English translation.

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