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US 4,542,970 AGranted
Shutter release device
AssigneeCanon Kabushiki Kaisha
InventorsRyoichi Suzuki, Ryuji Tokuda
Life of this patent
Estimating the term…
Abstract
A shutter release device designed so that at the time of the self-timer photographing, the self-timer circuit is operated by a depression of the shutter button which closes the switch associated with the shutter button, the self-timer circuit is made non-operative by closing the above switch with re-operation of the shutter button during the self-timer operation so that the shutter release operation can immediately be carried out.
Claims12
A shutter release device comprising:
- (a) a shutter release switch having a first state and a second state, and rendering a releasing operation to be carried out in said second state;
- (b) self-timer mode setting means;
- (c) a self-timer circuit arranged to initiate a time measuring operation with change of said shutter release switch from a first state to a second state after the setting of the self-timer mode by said self-timer mode setting means, and upon termination of the time measuring operation, to produce a release signal;
- (d) detecting means for electrically detecting that, after the self-timer mode has been set by said self-timer mode setting means, said shutter release switch has been twice changed over from the first state to the second state;
- (e) shutter release operation means for carrying out a shutter release operation in response to a shutter release signal;
- and
- (f) a release signal forming circuit for forming a shutter release signal when said detecting means detects the fact that after the self-timer mode has been set by said self-timer mode setting means, said shutter release switch has been twice changed over from the first state to the second state.
4 more elements
A camera having a self-timer photo-taking mode, comprising:
- (a) release operation means for carrying out a shutter release operation in response to a release signal;
- (b) a release switch having a first state and a second state to carry out the release operation in its second state;
- (c) a time counting circuit for carrying out the time counting process for a prescribed period of time in a self-timer photo-taking mode and for producing a signal after the completion of the time counting;
- (d) a detection circuit to detect that the release switch has changed over from the first state to the second state in the self-timer photo-taking mode and for producing a signal;
- and
- (e) an OR gate for producing a logical sum of the signal from the time counting circuit and the signal from the detection circuit as the release signal.
3 more elements
A camera having a self-timer photo-taking mode, comprising:
- (a) release operation means for carrying out a shutter release operation in response to a release signal;
- (b) a release switch having a first state and a second state to qarry out the release operation in its second state;
- (c) a time counting circuit for carrying out the time counting process for a prescribed period of time in a self-timer photo-taking mode and for producing a signal after the completion of the time counting;
- (d) a detection circuit to detect that the release switch has changed over from the first state to the second state in the self-timcr photo-taking mode and for producing a signal;
- and
- (e) a logic gate circuit for producing a logical sum of the signal from the time counting circuit and the signal from the detection circuit as the release signal.
3 more elements
A camera having a self-timer photo-taking mode, comprising:
- (a) release operation means for carrying out a shutter release operation in response to a release signal;
- (b) a release switch having a first state and a second state to carry out the release operation in its second state;
- (c) a time forming circuit for carrying out the time forming process for a prescribed period of time in a self-timer photo-taking mode and producing a signal after the completion of the time counting;
- (d) a detection circuit to detect that the release switch has changed over the first state to the second state during the time forming process and for producing a signal;
- and
- (e) a logic circuit for producing a logical sum of the signal from the time forming circuit and the signal from the detection circuit as the release signal.
3 more elements
A camera having a self-timer photo-taking mode, comprising:
- (a) release operation means for carrying out a shutter release operation in response to a release signal;
- (b) a release switch having a first state and a second state to carry out the release operation in its second state;
- (c) a time forming circuit for carrying out the time forming process for a prescribed period of time in a self-timer photo-taking mode and producing a signal after the completion of the time counting;
- and
- (d) a detection circuit to detect that the release switch has changed over the first state to the second state during the time forming process and for producing a signal as the release signal.
2 more elements
Dependencies are inferred from the claim text.