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US 4,361,390 AGranted
Focus condition indicating system for use in a camera
AssigneeMinolta Camera Kabushiki Kaisha
InventorSeiji Yamada
Life of this patent
Estimating the term…
Abstract
A focus condition indicating system for use in a camera includes a control signal producer provided in association with an objective lens of the camera for producing a control signal when the objective lens moves past a proper focus position and a sound producer for producing a sound signal upon receipt of the control signal.
Claims18
A focus condition indicating system for use in a camera comprising:
- an objective lens movable between a near focus position, where an image of a target object located a minimum available distance away from the camera can be focused on an image forming plane, and an infinite focus position, where an image of a target object located at a substantially infinite distance away from the camera can be focused on said image forming plane;
- control signal producing means for producing a control signal when said objective lens moves past a proper focus position;
- and
- sound producing means for producing a sound signal for a given short period of time upon receipt of said control signal.
1 more element
A focus condition indicating system for a camera comprising:
- a camera objective lens including a movable member which is movable for effecting a focus adjustment of the objective lens;
- a first signal means for generating a focus signal which varies in dependence upon the position of said movable member relative to an in-focus position thereof wherein said camera objective lens is focused on a desired object;
- a second signal means for generating a control signal in response to the variation of said focus signal at a time when said movable element passes said in-focus position;
- a sound producing means for producing an audible indication;
- and
- means for actuating said sound producing means for a given short period of time in response to said control signal.
3 more elements
Dependencies are inferred from the claim text.