Optical apparatus including zooming means focus including a part

Details Optical apparatus including zooming means focus including a part Optical apparatus including zooming means focus including a part

1996-01-25

1998-03-03

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359697, 359701, G02B 1514

Patent

active

057241945

ABSTRACT:
A lens barrel or an optical apparatus includes a first lens arranged to move for varying an image forming magnification, a second lens arranged to move for focusing and for compensating for a change in image forming position resulting from a movement of the first lens, a focusing part arranged to drive the second lens and having a backlash, and a zooming part which is arranged to drive the first lens and the second lens in an interlocking manner and to cause the second lens to move by using a part of the focusing part. The backlash is corrected when zooming is performed by the zooming part.

REFERENCES:
patent: 4536072 (1985-08-01), Taniguchi et al.
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5359381 (1994-10-01), Miyazawa et al.

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