Brush mounting structure for encoder and focal length detection

Details Brush mounting structure for encoder and focal length detection Brush mounting structure for encoder and focal length detection

1998-10-22

1999-11-30

Perkey, W. B.

Photography

Having variable focal length of camera objective

Power zoom

G03B 1700

Patent

active

059957646

ABSTRACT:
A brush mounting structure for an encoder in a zoom lens barrel includes a code plate and a brush operatively arranged in a zoom lens barrel which constitute an encoder which detects the focal length in accordance with a relative sliding movement between the code plate and the brush; and a helicoid lens barrel member which is provided with a helicoid portion and which constitutes the zoom lens barrel. The brush is provided on the helicoid portion of the helicoid lens barrel. A focal length detection circuit in the zoom lens barrel is also disclosed.

REFERENCES:
patent: 4596449 (1986-06-01), Iwata et al.
patent: 5291232 (1994-03-01), Kobayashi et al.
patent: 5543971 (1996-08-01), Nomura et al.
patent: 5809348 (1998-09-01), Nomura et al.
patent: 5809361 (1998-09-01), Nomura et al.

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