Optical: systems and elements – Lens – With support
Patent
1998-06-29
1999-10-19
Dang, Hung Xuan
Optical: systems and elements
Lens
With support
359823, G02B 702
Patent
active
059698896
ABSTRACT:
A lens barrel has an immovable cylindrical member adapted to be detachably attached to a camera body, and a lens holder for holding a group of focusing lenses. The holder is disposed in the member so as to be movable along an optical axis of the focusing lenses for a focusing adjustment. A manual-focusing ring, rotatably mounted on the member, is manually movable along the optical axis between an auto-focusing (AF) position and a manual-focusing (MF) position, and has a plurality of recesses circumferentially arranged and formed on an inner wall surface thereof. A drive mechanism, provided between the member and the holder to convert a rotation into a translation of the holder along the optical axis, has at least a pin which is subjected to the rotation. The pin is engaged in one of the recesses of the ring when the ring is at the MF position, such that a rotation of the ring is transmitted to the drive mechanism. The pin is disengaged from the one of the recesses of the ring when the ring is at the AF position.
REFERENCES:
patent: 4324457 (1982-04-01), Tomori
patent: 4333712 (1982-06-01), Tomori
patent: 4506959 (1985-03-01), Hama
patent: 4523815 (1985-06-01), Tomori
patent: 4893145 (1990-01-01), Matsuda
patent: 5144494 (1992-09-01), Sekiguchi
patent: 5239417 (1993-08-01), Eguchi
patent: 5786946 (1998-07-01), Imura
Iikawa Makoto
Kobayashi Tomoaki
Asahi Kogaku Kogyo Kabushiki Kaisha
Dang Hung Xuan
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