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US 4,538,893 AGranted
Motor driven camera
AssigneeNippon Kogaku K.K.
InventorsYoshiyuki Nakano, Osamu Maida
Life of this patent
Estimating the term…
Abstract
In a camera having a stop drive mechanism adapted to be driven by an electric motor to vary a stop aperture and a film wind-up mechanism adapted to be driven by the electric motor to wind up a film, the electric motor is rotated to drive the stop drive mechanism before exposure of the film, and it is also rotated to drive the film wind-up mechanism after the exposure of the film. The rotating speeds of the electric motor in the first rotation to drive the stop drive mechanism and in the second rotation to drive the film wind-up mechanism are independently variable.
Claims19
A drive device for a camera comprising:
- (a) an electric motor;
- (b) stop drive means adapted to be driven by said electric motor to change a stop aperture of a lens;
- (c) means for measuring the brightness of a subject to be photographed, and which generates an electric signal when said stop aperture which is changed reaches a predetermined aperture adaptive to the brightness of said subject;
- (d) means for stopping said stop drive means in response to said electric signal;
- (e) film wind-up means adapted to be driven by said electric motor to wind up a film frame by frame;
- and
- (f) control means for causing said electric motor to make a first rotation to drive said stop drive means prior to exposure of the film and causing said electric motor to make a second rotation to drive said film wind-up means after the exposure of the film, said control means including means for varying the rotating speed of said electric motor for said second rotation and means for adjusting the rotating speed of said electric motor to a determined speed for said first rotation.
4 more elements
A drive device for a camera, comprising:
- (a) an electric motor;
- (b) reflecting mirror means which is movable by said electric motor from its position intersecting a light path between a lens and an exposed film to its postion retracted from the light path;
- (c) film wind-up means adapted to be driven by said electric motor to wind up a film frame by frame;
- and
- (d) control means for causing said electric motor to make a first rotation to drive said mirror means prior to exposure to the film and causing said electric motor to make a second rotation to drive said film wind-up means after the exposure to the film, said control means including means for varying the rotating speed of said electric motor for said second rotation and means for adjusting the rotating speed of said electric motor to a determined speed for said first rotation.
2 more elements
A photographic still camera, comprising:
- (a) electric motor means;
- (b) stop drive means adapted to be driven by said electric motor means to change a stop aperture of a lens;
- (c) means for electrically latching said stop drive means when said stop aperture is changed to a predetermined value;
- (d) wind-up means adapted to be driven by said electric motor means to wind up a film frame by frame;
- and
- (e) control means for controlling said electric motor means, said control means including means for adjusting the rotation speed of said electric motor means to a first constant speed to drive said stop drive means and adjusting the rotation speed to a second constant speed slower than the first constant speed to drive said wind-up means.
3 more elements
A photographic camera, comprising:
- (a) electric motor means;
- (b) means adapted to produce a speed signal responsive to the rotating speed of said electric motor means;
- (c) stop aperture driving means shiftable in response to the rotation of said electric motor means so that a stop aperture of a lens may be varied from maximum aperture toward minimum aperture;
- (d) means which stops the shift of said stop aperture driving means when the stop aperture of the lens changes to a given diaphragm value;
- (e) the stop means including means which produces a stop signal before said stop aperture which is changing reaches said given diaphragm value and means which is actuated in response to said stop signal and connects to said stop aperture driving means;
- and
- (f) the stop signal producing means including compensation means which accelerates the time of generating said stop signal responsive to said speed signal according to the increased rotating speed of said electric motor means.
4 more elements
A drive device for a camera, comprising:
- (a) an electric motor;
- (b) stop drive means adapted to be driven by said electric motor to change a stop aperture of a lens;
- (c) means for measuring the brightness of a subject to be photographed, and which generates an electric signal when said stop aperture which is changed reaches a predetermined aperture adaptive to the brightness of said subject;
- (d) means for stopping said stop drive means in response to said electric signal;
- (e) film wind-up means adapted to be driven by said electric motor to wind up a film frame by frame;
- (f) means for supplying electric power to said electric motor, said electric power supply means including means for switching an average output electric power between a plurality of different values;
- (g) control means for causing said electric motor to make a first rotation to drive said stop drive means prior to exposure of the film and causing said electric motor to make a second rotation to drive said film wind-up means after the exposure of the film;
- and
- (h) adjusting means operative to adjust the electric power from said electric power supply means to a predetermined level and supply the same to said electric motor during said first rotation of said electric motor.
6 more elements
A photographic camera, comprising:
- (a) electric motor means;
- (b) a camera housing having a film chamber for receiving a film supply spool and a film take-up spool, the camera housing being provided with a lid member for closing the film chamber;
- (c) advancing means adapted to be driven by said electric motor means to feed a film from said supply spool to said take-up spool;
- (d) switch means adapted to be operated by an operator for starting the rotation of said electric motor means;
- and
- (e) means for driving said electric motor means in response to said switch means, the driving means causing the electric motor means to rotate during a determined period of time when said film chamber is closed by said lid member and causing the electric motor means to rotate during a period of time shorter than said determined period of time when said lid member is open.
3 more elements
A photographic still camera, comprising:
- (a) electric motor means;
- (b) stop drive means adapted to be driven by said electric motor means to change a stop aperture of a lens;
- (c) means for electrically latching said stop drive means when said stop aperture is changed to a predetermined value;
- (d) means adapted to be driven by said electric motor means for advancing a film;
- and
- (e) control means for controlling said electric motor means, said control means including means for adjusting the rotation speed of said electric motor means to a first constant speed to drive said stop drive means and adjusting the rotation speed to a second constant speed slower than the first constant speed to drive said advancing means.
3 more elements
A photographic camera, comprising:
- (a) electric motor means;
- (b) a camera housing having a film chamber for receiving a film supply spool and a film take-up spool, the camera housing being provided with a lid member for closing the film chamber;
- (c) advancing means adapted to be driven by said electric motor means to feed a film from said supply spool to said take-up spool;
- (d) an operation member adapted to be operated by an operator from an initial position to an operated position;
- and
- (e) means for controlling the rotation of said electric motor means in response to said operation member when said lid member is open, the control means including a power supplying circuit adpated to be enabled when said operation member is operated to said operated position for supplying an electric power to said electric motor means and a braking circuit adapted to be enabled when said operation member is returned to said initial position for stopping the rotation of said electric motor means.
3 more elements
Dependencies are inferred from the claim text.