Shutter mechanism

• US 3,973,269 A
• Filed: 02/26/1975
• Issued: 08/03/1976
• Est. Priority Date: 02/26/1974
• Status: Expired due to Term

• Current Assignee: Sinar AG Schaffhausen
• Original Assignee: Sinar AG Schaffhausen
• Inventors: Gfeller, Karl, Koch, Carl
• Primary Examiner(s): Adams, Jr., Russell E.
• Application Number:
  US05/553,160
• Time in Patent Office: 524 Days
• Field of Search: 354/26, 354/29, 354/38, 354/50, 354/51, 354/60 R, 354/234, 354/235, 354/250, 354/252, 354/258
• US Class Current: 396/454
• CPC Class Codes: G03B 9/16 Two separate members moving in the same direction
• CPC Class Codes: G03B 9/62 by varying interval of time between end of opening movement and beginning of closing movement

Abstract

An electrically controlled shutter device for a photograhic camera. The shutter device includes a shutter element which is mounted for movement for opening and closing a light admitting aperture of the camera. A drive mechanism causes the movement of the shutter element between its respective positions. An external trigger control provides for initiation of the opening and closing of the aperture during the exposure operation. A position monitoring mechanism is associated with the shutter element for providing a signal in dependence upon the shutter element being located in a predetermined position. A control mechanism is coupled to the output of the position monitoring mechanism and controls the operation of the shutter device as a function of the signal provided by the position monitoring mechanism and as a function of the signals from the external trigger control.

Claims

1. An electrically controlled shutter device for a photographic camera, the shutter device comprising:

at least one shutter element mounted for movement between two rest positions for opening and closing a light admitting aperture of the camera;

drive means operatively associated with said shutter element for causing the movement of said shutter element between its rest positions;

external trigger control means for initiating an opening and closing of said aperture for an exposure operation and supplying electrical signals indicative of such operation;

position monitoring means associated with said shutter element for providing a signal in dependence upon said shutter element being located at a predetermined position;

braking means operatively associated with said shutter element; and

,

control means coupled to an output of said position monitoring means for controlling the operation of the shutter device as a function of signals provided by said position monitoring means and as a function of signals from said external trigger control means, and said control means being operatively coupled to said braking means for selectively controlling its operation as a function of a signal provided by said position monitoring means upon movement of said shutter element into a predetermined position.

2. A shutter device according to claim 1, wherein said shutter element is movable between first and second predetermined rest positions;

said braking means is operatively associated with said shutter element for braking said shutter element when in one of said first and second positions; and

said control means is operatively coupled with said drive means and said braking means so that prior to activation of said drive means for moving said shutter element from its first to its second position, said control means shuts off said braking means so as to release said shutter element from its first position and afterwards activates said braking means as a function of a signal provided by said position monitoring means upon movement of said shutter element into its second position.

3. A shutter device according to claim 2, wherein said control means includes means which, after each initiation of said drive means, shuts off said drive means as a function of a signal provided by said position monitoring means after said shutter element has moved by a predetermined distance, and said position monitoring means includes two position monitors coupled to said control means and operatively associated with said shutter element, one of said position monitors providing a signal to shut off said drive means and the other position monitors providing a signal to initiate the operation of said braking means.

4. A shutter device according to claim 1, wherein said position monitoring means is photoelectrically operated.

5. An electrically controlled shutter device for a photographic camera, the shutter device comprising:

at least one shutter element mounted for movement between two rest positions for opening and closing a light admitting aperture of the camera;

drive means operatively associated with said shutter element for causing the movement of said shutter element between its rest positions;

external trigger control means for initiating an opening and closing of said aperture for an exposure operation and supplying electrical signals indicative of such operation;

position monitoring means associated with said shutter element for providing a signal in dependence upon said shutter element being located at a predetermined position;

control means coupled to an output of said position monitoring means for controlling the operation of the shutter device as a function of signals provided by said position monitoring means and as a function of signals from said external trigger control means, said control means including means which after each initiation of said drive means shuts said drive means off as a function of a signal provided by said position monitoring means after said shutter element has moved a predetermined distance such distance being substantially smaller than the stroke between the two rest positions of said shutter element.

6. An electrically controlled shutter device for a photographic camera, the shutter device comprising:

at least one shutter element mounted for movement between first and second rest positions for opening and closing a light admitting aperture of the camera;

drive means including two drive mechanisms operatively associated with said shutter element for alternately driving said shutter element from its first to its second rest position and from its second to its first rest position;

external trigger control means for initiating an opening and closing of said aperture for an exposure operation and supplying electrical signals indicative of such operation;

position monitoring means including two position monitors associated with said shutter element, one of said two position monitors being arranged to supply a signal when said shutter element is in one of said rest positions and the other of said position monitors being arranged to supply a signal when said shutter element is in the other of said rest positions;

control means coupled to an output of each of said position monitors for controlling the operation of the shutter device as a function of signals provided by said position monitoring means and as a function of signals from said external trigger control means, said control means including means for alternately controlling said drive mechanisms for driving said shutter element in opposite directions as a function of signals provided by said position monitoring means.

7. A shutter device according to claim 6 further comprising another shutter element movable between corresponding first and second predetermined rest positions and braking means for braking said shutter elements in one of their respective positions;

and wherein said braking means includes two braking mechanisms, each being operatively associated with one of said shutter elements, and said control means includes further means for selectively actuating one of said braking mechanisms as a function of a signal provided by said position monitoring means, when said shutter element associated with the respective said brake mechanism moves into one of its predetermined positions.

8. A shutter device according to claim 7, wherein said control means includes a flip-flop circuit coupled to said position monitoring means for controlling said drive mechanisms associated with said shutter elements as a function of signals provided by said position monitors.

9. A shutter device according to claim 6, further comprising another shutter element movable between corresponding first and second predetermined rest positions and braking means for braking said shutter elements in one of their respective positions;

and wherein;

there are two drive mechanisms, each being operatively associated with one of said shutter elements;

said braking means includes two brake mechanisms, each being operatively associated with one of said shutter elements for braking such shutter element in one of its first and second predetermined positions; and

said control means includes further means, which upon each initiation of one of said drive mechanisms for driving one of said shutter elements, stops the respective said braking mechanism from braking said shutter element in its first predetermined position and subsequently actuates said respective braking mechanism as a function of a signal provided by one of said position monitors, when said driven shutter element moves into its second predetermined position.

10. An electrically controlled shutter device for a photographic camera, the shutter device comprising:

two shutter elements each mounted for movement between corresponding first and second rest positions for opening and closing a light admitting aperture of the camera;

drive means including two drive mechanisms, each being operatively associated with one of said shutter elements, so that during an exposure period, said drive mechanisms being able to move each of said shutter elements in succession with a selected time interval from its first into its second position;

external trigger control means for initiating an opening and closing of said aperture for an exposure operation and supplying electrical signals indicative of such operation;

position monitoring means including two position monitors associated with said shutter elements for providing a signal in dependence upon said shutter element being located at a predetermined position;

braking means for braking said shutter elements in one of their respective positions includes two braking mechanisms, each being operatively associated with one of said shutter elements for braking such shutter element; and

control means coupled to an output of each said position monitor for controlling the operation of the shutter device as a function of signals provided by said position monitoring means and as a function of signals from said external trigger control means, said control means including means for selectively actuating said braking mechanisms as a function of a signal provided by one of said position monitors, when the corresponding said shutter element moves into its second predetermined position.

11. A shutter device according to claim 10, wherein each said braking mechanism brakes the corresponding said shutter element both in its first and second positions;

and said further means of said control means, upon initiation of any of said drive mechanisms for driving one of said shutter elements, turns off said braking mechanism associated with such shutter element in its first predetermined position and subsequently reactuates said braking mechanism as a function of a signal provided by one of said position monitors with the movement of said driven shutter element into its second predetermined position.

12. A shutter device according to claim 11, wherein said control means includes further means which after actuation of each of said drive mechanisms shuts off such drive mechanism as a function of a signal provided by one of said position monitors after said shutter element has moved a predetermined distance.

13. A shutter device according to claim 12, wherein one of said position monitors provides a signal to turn off a respective said drive mechanism and the other of said position monitors provides a signal to actuate a respective said braking mechanism.

14. A shutter device according to claim 10, wherein said position monitoring means includes a total of three position monitors, the first position monitor being exclusively associated with one of said shutter elements, the second position monitor being exclusively associated with the other said shutter element and the third position monitor being associated with both of said shutter elements.

15. An electrically controlled shutter device for a photographic camera, the shutter device comprising:

two shutter elements each movable between corresponding first and second predetermined rest positions;

external trigger control means for initiating an opening and closing of said aperture for an exposure operation and supplying electrical signals indicative of such operation;

drive means including a first pair of drive mechanisms operatively associated with said shutter elements for moving them back and forth in succession in one direction from the first into the second rest position with a selected time interval for an exposure operation and a second pair of drive mechanisms for moving said shutter elements in succession in an opposite direction from the second into the first rest position with a selected time interval for an exposure operation;

position monitoring means including two position monitors operatively associated with said shutter elements for providing signals in dependence upon said shutter elements being located in predetermined positions; and

,

control means including means for controlling said drive mechanisms alternately in pairs for moving said shutter elements positions, in response to signals provided by said position monitors and said external trigger control means.

16. A shutter device according to claim 15, further comprising two brake mechanisms, each being operatively associated with one of said shutter elements for braking the corresponding said shutter element both when in its first and in its second rest position;

and wherein said control means includes additional means, which with each initiation of any of said drive mechanisms for movement of one of said shutter elements, deactuates the corresponding said braking mechanism and subsequently reactuates said braking mechanism as a function of signals provided by said position monitors with movement of said driven shutter element into one of its rest positions.

17. A shutter device according to claim 16, wherein said control means includes further means, which after initiation of any of said drive mechanisms for movement of one of said shutter elements, shuts off such drive mechanisms as a function of a signal provided by one of said position monitors after said driven shutter element has been moved a predetermined distance.

18. A shutter device according to claim 17, wherein each of said two position monitors is operatively associated with only one of said shutter elements and said position monitoring means further includes a third position monitor operatively associated with both of said shutter elements, said position monitors associated with each respective said shutter element alternately providing a signal to deactuate the corresponding said drive mechanism and a signal to initiate the corresponding said brake mechanism.

19. A shutter device according to claim 15, wherein said position monitoring means includes a total of three position monitors, the first position monitor being exclusively associated with one of said shutter elements, the second position monitor being exclusively associated with the other said shutter element and the third position monitor being associated with both of said shutter elements.

20. A shutter device according to claim 15, wherein said control means includes a flip-flop circuit coupled to said position monitoring means for controlling said drive mechanisms associated with shutter elements as a function of signals provided by said position monitors.

21. A shutter device according to claim 15, wherein said control means includes electronic logic switching means for controlling all four of said drive mechanisms in cyclical sequence as a function of signals provided by said position monitors.