Lens barrel for flash photography
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorShinsuke Komoto
Life of this patent
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Abstract
A lens barrel in which a distance ring is coupled to an aperture ring so that correct exposure can be obtained in flash photography. In the arrangement, a rotating member, which rotates integrally with the aperture ring, and the distance ring can rotate functionally with respect to each other through a fixed cylinder and an engaging member which can move in the direction of optical axis with respect to the fixed cylinder.
Claims2
In a lens barrel assembly including a fixed cylinder and in which a distance ring is coupled to an aperture ring for rotation relative to said fixed cylinder so that a correct exposure can be obtained in flash photography, the improvement comprising:
- rotating member means for rotation integrally with said aperture ring;
- and
- engaging means movable with respect to said fixed cylinder in the direction of an optical axis so that said aperture ring and said distance ring can rotate functionally with each other;
- and wherein:
- said fixed cylinder has a cam groove therein, and said distance ring has a pin engaging said cam groove;
- said engaging means has cam groove means for rotating said rotating member means;
- said distance ring has a lead groove and a circumferentially extending groove;
- said engaging means has a pin engaging said circumferentially extending groove;
- and
- said rotating member means has a pin engaging said lead groove of said distance ring and the cam groove means of said engaging means.
Dependencies are inferred from the claim text.