Lens barrel having a manually focusing ring

Details Lens barrel having a manually focusing ring Lens barrel having a manually focusing ring

1996-11-20

1997-12-23

Nelms, David C.

Optical: systems and elements

Lens

With support

359696, 359697, 359698, 396137, G02B 1514, G03B 118

Patent

active

057012091

ABSTRACT:
A lens barrel has a manual focusing ring which is rotatable about the optical axis so as to attain a manual focusing operation, a focusing rotary cylinder which defines the position, in the optical axis direction, of a focusing optical system, and is rotatable about the optical axis, an auto-focusing power transmission member for directly transmitting the moving force from an auto-focusing power source to the focusing rotary cylinder, a free rotation cylinder which is arranged on the focusing rotary cylinder, and is rotatable about the optical axis, a manual focusing power transmission member for transmitting the moving force from the manual focusing ring, a power relaying member which constitutes a differential mechanism together with the manual focusing power transmission member and the free rotation cylinder, and applies the rotation driving force to the focusing rotary cylinder by receiving the moving force transmitted from the manual focusing power transmission member, and a locking member for locking the free rotation cylinder in the manual focusing operation.

REFERENCES:
patent: 4456356 (1984-06-01), Okabe
patent: 4461544 (1984-07-01), Isobe
patent: 4491396 (1985-01-01), Isobe
patent: 4956657 (1990-09-01), Shintani et al.
patent: 5041855 (1991-08-01), Takezawa et al.
patent: 5420721 (1995-05-01), Kanno et al.
patent: 5576894 (1996-11-01), Kuwana et al.

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