Title:
CAMERA LENS
Document Type and Number:
Japanese Patent JPH04130409
Kind Code:
A
Abstract:
PURPOSE:To surely and smoothly move an extender lens by providing the extender lens part which is moved along an optical axis direction to vary a focal distance as one part of a master lens part. CONSTITUTION:The extender lens part 11 is one part of the master lens part and it is moved along the optical axis direction to vary the focal distance. Then, a driving mechanism moves the lens part 11 and an electric motor 45 actuates the driving mechanism. By moving the lens part 11 by means of the motor 45 in such a way, the lens part 11 is surely moved even when it is unconsciously moved, and also it is smoothly moved.
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Inventors:
MIYAKE MAKOTO
Application Number:
JP25233390A
Publication Date:
May 01, 1992
Filing Date:
September 21, 1990
Export Citation:
Assignee:
SHARP KK
International Classes:
G02B15/20; (IPC1-7): G02B15/20
Domestic Patent References:
| JPS49122350A | 1974-11-22 | |||
| JPS51134140A | 1976-11-20 | |||
| JPH03161729A | 1991-07-11 | |||
| JPH03216610A | 1991-09-24 |
Attorney, Agent or Firm:
Fukami Hisaro (2 outside)