US3762297A - Electromagnetic control mechanism for electric shutter - Google Patents

Electromagnetic control mechanism for electric shutter Download PDF

Info

Publication number
US3762297A
US3762297A US00315847A US3762297DA US3762297A US 3762297 A US3762297 A US 3762297A US 00315847 A US00315847 A US 00315847A US 3762297D A US3762297D A US 3762297DA US 3762297 A US3762297 A US 3762297A
Authority
US
United States
Prior art keywords
shutter
armature
electromagnet
closing
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00315847A
Other languages
English (en)
Inventor
K Kitai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Koki KK
Original Assignee
Seiko Koki KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Koki KK filed Critical Seiko Koki KK
Application granted granted Critical
Publication of US3762297A publication Critical patent/US3762297A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/58—Means for varying duration of "open" period of shutter

Definitions

  • ABSTRACT An electromagnetic control mechanism for an electric shutter of a camera.
  • the shutter-operating mechanism is controlled by a biased control lever which is linked to the armature of an electromagnet that controls release of the control lever which releases the shutteroperating mechanism for closing the shutter.
  • a pressure-applying member applies a biasing force or pressure to the armature urging it to its attracted position which is maintained by the electromagnet when energized prior to removal of this pressure force.
  • the application of this pressure force eliminates any effect of play in the mechanical connection between the armature and the biased control lever, which is released by the electromagnet when de-energized, so that a smooth, positive and precise closing of the shutter is effected.
  • a control member for example a control lever, is used to control initiation of the termination of an exposure time upon de-energizing of an electromagnet.
  • the control member is connected to the armature of the electromagnet and is biased for initiating the control of shutteroperating mechanisms for closing the shutter upon deenergization of the shutter, and at the same time retracting or moving the armature away from its attracted position.
  • a pressureapplying member is used to apply a biasing force or pressure to the armature in a direction toward its attracted position and against the biasing force applied thereto by the control mechanism tending to move the armature away from its attracted position.
  • a connection between the control mechanism, and more particularly, the control lever of this mechanism, and the armature generally have a certain amount of play therein such that the shutter-operating mechanism in opening the shutter for taking an exposure may affeet the pressure-applying member so that it delivers a mechanical impulse to the armature which may tend to actuate the armature in a direction away from its attracted position after it has been attracted by the electromagnet.
  • the electromagnet once energized, must be sufficiently strong enough to overcome the biasing force of the control lever and this mechanical impulse might otherwise cause an inadvertent release of the armature thereby prematurely terminating the exposure time when an exposure is being taken.
  • a control member for example a control lever is connected to the armature initiating the closing of the shutter upon completion of exposure time upon deenergization of the electromagnet.
  • This control means is biased in a direction for initiating closing of the shutter and in a direction for moving the armature away from its attracted position.
  • a pressure-applying lever or means applies pressure to the armature directly in a direction to maintain it in its attracted position. This pressure-applying means is independent of the control lever.
  • FIG. 1 is a diagrammatic elevation view of a known electromagnetic control mechanism for an electric shutter
  • FIG. 2 is a diagrammatic elevation view of a shutter of the type shown in FIG. 1 provided with the invention
  • FIG. 3 is a second embodiment of an electromagnetic control mechanism for a shutter according to the invention.
  • FIG. 4 is a fragmentary elevation view of an electromagnetic control mechanism for an electric shutter for a camera according to the invention.
  • FIG. 1 a well known electromagnetic control mechanism for an electric shutter of a camera is disclosed.
  • a driving plate or cam 1 pivotally mounted on a shaft 2, is biased in a counterclockwise direction by a spring 3 for opening and closing a shutter as hereinafter explained.
  • a pivot 4 about which is wound a biasing spring 5 pivotally supports a lock lever 6 which is biased in a clockwise direction by the biasing spring 5 so that it engages a notch or shoulder formed on a cam surface la of the driving plate 1 to releasably hold the driving plate or cam l in a position as illustrated in FIG. l which constitutes a condition corresponding to the cocked or charged condition of an electric shutter, not shown, with which this mechanism is associated.
  • the operating lever 7 is provided adjacent one end thereof with a pin 9 having a semicircular cross section.
  • a crank lever 10 is pivotally mounted on a pivot l 1 supported on the driving plate 1 and is biased by a spring 12 in a clockwise direction.
  • the pin of the operating lever 7 engages a notch 10a on the crank lever 10 and configured as illustrated.
  • a control lever 13 is pivotally mounted on a pivot 14 and is biased in a counterclockwise direction by a spring 15.
  • the control lever is provided with a pin 16 connecting it to an electromagnet armature 17 which has an opening 17a into which the pin 16 extends.
  • a clearance l exists between the pin and the aperture providing play" in the connection.
  • a plate spring 18 is mounted or riveted with rivets 19 on the control lever 13 and cooperates with a cam surface 1a of the driving plate or cam l for applying a counterforce to the control lever 13 against the action of its biasing spring 15 and applying its force in the direction of maintaining the armature in its attracted position.
  • the shutter In the position of the elements illustrated in FIG. 1, the shutter is in a cocked condition and the plate spring 18 is biased or deflected so that the counterforce is developed.
  • the lock lever 6 is released when the release lever, not shown, of the camera is actuated so that the driving plate or cam 1 is rotated by its biasing spring counterclockwise so that a notch 1b thereon engages a tip 13b of the control lever 13 and the driving cam is precluded from continuing its rotation.
  • the driving cam l actuates the shutter blade operating lever 7 so that the blades of the shutter, not shown, are actuated to an open position.
  • the armature 17 In the cocked condition, the armature 17 is biased by the plate spring 18 to its attracted position in its electromagnet 20, however, when the driving cam l rotates in its initial phase of rotation, the cam surface In thereof is rotated out of its position in which it contacts the plate spring 18 so that the biasing force on the armature is not developed.
  • switch means in the electrical circuitry, not shown, of the shutter has been controlled so that the electromagnet 20 is electrically energized and retains the armature 17 attracted and the control lever 13 is maintained in the position shown in the cocked condition.
  • the electromagnet 20 When the electromagnet is de-energized, for example as a function of the brightness of a scene being photographed, the electromagnet 20 is de-energized and the control lever is released so that its biasing spring rotates it in a counterclockwise direction so that the driving cam 1 is freed from its temporarily locked position and the driving cam rotates further so the exposure time is determined or terminated since the further rotation of the driving plate or cam 1 actuates the shutter to a closed position and an exposure is completed. The mechanism is restored to a cocked condition by means not shown.
  • the movement of the cam 1 or rotation thereof through its initial phase causes a mechanical impulse to be applied to the armature in view of the play 1. Accordingly, the electromagnet must be sufficiently strong to retain the armature attracted against the mechanical impulse applied and the force of the biasing spring 15 to avoid premature release of the armature which would result in an improper exposure.
  • a pressure-applying lever 21 is pivotally mounted on the pivot 14 coaxially with a control lever 13 so that the control lever and this pressure-applying lever are different from the structure of the firstdescribed embodiment.
  • the plate spring 18 is mounted on the pressure-applying lever 21 so that it applies a pressure force or biasing force directly on the armature l7 urging it toward its attracted position.
  • FIG. 3 A second embodiment of an electromagnetic control mechanismfor an electric shutter embodying the invention is illustrated in FIG. 3.
  • the electric shutter opens and closes a lens aperture 60 provided on a camera, not shown.
  • the shutter is illustrated in the drawing in a charged or cocked state in which an opening shutter plate 61 closes the lens aperture 60 and is biased upwardly by a spring 62. It is provided with a projection 61a engaged by a lock lever 63 pivotally mounted on a pivot 64 and biased in a clockwise direction by a biasing spring 65 to maintain the opening shutter plate 61 in the position shown.
  • the opening plate is provided with an aperture 61b for registry with the lens aperture for taking an exposure when a photograph or exposure is to be taken as later described.
  • a pivot 66 on the opening plate pivotally mounts a pressure-applying lever 67 which is biased in a clockwise direction by a spring 68 and directly applies pressure to an armature 69 of an electromagnet 70 biasing it in the direction of its attracted position.
  • a closing plate 71 has an aperture 71a in registry with the lens aperture of the camera when the shutter is closed in the charged state or cocked condition illustrated in FIG. 3.
  • the closing plate 71 is biased upwardly by a spring 72 and is provided with a pin 73 received in an opening 69a of the armature 69 providing a mechanical connection therewith and play as illustrated.
  • the play clearance is on the lower side of the pin 73 and is eliminated with respect to the movement of the closing plate 71 when released by the electromagnet.
  • the camera release lever When the camera release lever, not shown, is actuated for taking an exposure, it releases the lock lever 63 which releases the closing plate 61 and it moves upwardly under the control of the spring 62 for opening the shutter.
  • the pressure-applying lever 67 disengages from the armature 69 as the opening plate moves upwardly, however, this happens subsequently to the electrical circuitry, not shown, of the shutter energizes the electromagnet 70 so that the armature is retained in an attracted condition.
  • the electromagnet When the electromagnet is deenergized, by circuitry controlling the time exposure period, the armature is released and the closing plate 71 is thereby released and it moves upwardly under the control of the spring 72 closing the shutter completing the exposure.
  • the mechanical connection between the armature and the closing plate 71 is a positive connection free of any effect of the play as before described.
  • FIG. 4 A third embodiment, an electromagnetic control mechanism for a shutter embodying the invention is illustrated in FIG. 4, fragmentarily.
  • the shutter driving cam and other associated elements can be constructed as illustrated in FIGS. 1 and 2.
  • a shutter release lever 81 is provided and it is provided with elongated slots within which guide pins are received for guiding axial movement of the release lever 81 when depressed for taking an exposure. It is constantly biased upwardly by a biasing spring 82 and is depressed downwardly for taking of an exposure.
  • a pivot 83 alongside thereof pivotally mounts a pressure-applying lever 85 which is biased in a counterclockwise direction.
  • the release lever is provided with a pin 86 which engages the pressure-applying lever 85,
  • the pressure-applying lever 85 applies pressure directly onto an armature 87 of an electromagnet 88 and urges the armature in the direction of its attracted position.
  • a control lever 91 corresponding to the control lever 13 of the embodiment shown in FIG. 1 is pivotally mounted on a pivot 89 and is biased in a counterclockwise direction by a biasing spring 90.
  • the control lever is provided with a pin 92 received in an aperture 87a of the armature.
  • the pin 86 When the release lever 81 is operated to take an exposure, the pin 86 is moved downwardly and engages the pressure-applying lever. As the release plate moves downwardly, a switch, not shown, is closed in the initial period of movement to energize the electromagnet 88 and thereafter the pin 86 contacts the pressureapplying lever 85 making it rotate clockwise so it releases the armature 87 with respect to the mechanical pressure force applied thereto. However, since the armature has already been attracted and it is releasably held by the electromagnet 88, the armature maintains the control lever 91 at its initial position until the electromagnet 88 is de-energized, in which case it then releases the armature and the control lever rotates to allow the exposure time to be determined. Since the electromagnet retains the initial conditions until deenergized, the effect of the play in the mechanical connection between the pressure-applying lever 85 and the armature 87 is eliminated as is the case in the other two embodiments of the invention.
  • An electromagnetic control mechanism for an electrically-operated shutter for a camera comprising, an electrically energizable electromagnet for initiating the closing of a shutter upon de-energization thereof, said electromagnet comprising an armature, pressureapplying means applying pressure on the armature when the shutter is in a cocked condition biasing the armature to an attracted position thereof, control means releasably held by the electromagnet biased in a direction for initiating closing of said shutter when the shutter is in a cocked condition and releasably controlled by said electromagnet, connection means connecting the control means to said armature with some degree of play in the connection, and said pressureapplying means being disposed to apply pressure directly on the armature and in a direction eliminating any effect of the play in said connection, whereby when the electromagnet is de-energized the control means is released and closing of said shutter is initiated.
  • control means comprises a lever biased for movement from a rest position toward a position away therefrom for initiating closing of said shutter, and means to nullify the application of said pressure before said electromagnet is tie-energized.
  • An electromagnetic control mechanism in which the last-mentioned means comprises a release lever.
  • An electromagnetic control mechanism in which the last-mentioned means comprises a shutter plate mounting said pressure-applying means.
  • an electromagnetic control mechanism for initiating at least closing of said shutter comprising, a control member coactive with said shutter-operating mechanism for controlling and initiating the closing of a shutter by said shutter-operating mechanism, an electrically energizable electromagnet having an armature releasably holding the control member when energized and releasing it upon de-energization thereof to control initiation of closing of said shutter to terminate an exposure period, means biasing the control member toward a direction for initiating closing of said shutter, and pressure-applying means applying a force on said armature toward its attracted position when the electromagnet is in a de-energized condition and an exposure is not being taken and having means effectively removing the force at least when the electromagnet initiates termination of said exposure period.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
  • Shutter-Related Mechanisms (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)
US00315847A 1971-12-16 1972-12-18 Electromagnetic control mechanism for electric shutter Expired - Lifetime US3762297A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10212571A JPS5443372B2 (de) 1971-12-16 1971-12-16

Publications (1)

Publication Number Publication Date
US3762297A true US3762297A (en) 1973-10-02

Family

ID=14319052

Family Applications (1)

Application Number Title Priority Date Filing Date
US00315847A Expired - Lifetime US3762297A (en) 1971-12-16 1972-12-18 Electromagnetic control mechanism for electric shutter

Country Status (5)

Country Link
US (1) US3762297A (de)
JP (1) JPS5443372B2 (de)
DE (1) DE2261610B2 (de)
FR (1) FR2167034A5 (de)
GB (1) GB1376688A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236799A (en) * 1977-06-01 1980-12-02 Asahi Kogaku Kogyo Kabushiki Kaisha Unwinding-mechanism releasing device for use in a camera
US4803506A (en) * 1988-01-14 1989-02-07 Eastman Kodak Company Electromagnetic control device for cameras

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5129826U (de) * 1974-08-27 1976-03-04
JPS588493B2 (ja) * 1974-10-19 1983-02-16 ミノルタ株式会社 カメラニオケルケイシカイジヨフカケイゲンキコウ
JPS5153044U (de) * 1974-10-21 1976-04-22
JPS5650501Y2 (de) * 1975-02-05 1981-11-26
JPS51105338U (de) * 1975-02-19 1976-08-24
JPS5271525U (de) * 1975-11-25 1977-05-28
JPS5290032U (de) * 1975-12-26 1977-07-05
JPS5391634U (de) * 1976-12-27 1978-07-26
FR2411427B1 (fr) * 1977-09-30 1987-08-14 Olympus Optical Co Obturateur electrique a declenchement electromagnetique pour appareil photographique
DE2914930C2 (de) * 1979-04-12 1984-03-01 Kodak Ag, 7000 Stuttgart Photographischer Verschluß
JPS5616129U (de) * 1979-07-16 1981-02-12
KR820000844B1 (ko) * 1980-12-16 1982-05-17 포항종합제철 주식회사 암모니아 산화를 위한 비금속촉매 조성물
DD213767A1 (de) * 1983-02-14 1984-09-19 Pentacon Dresden Veb Einrichtung zur elektromagnetischen funktionssteuerung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507201A (en) * 1965-10-21 1970-04-21 Compur Werk Gmbh & Co Photographic shutter
US3525294A (en) * 1968-04-11 1970-08-25 Prontor Werk Gauthier Gmbh Shutter opening delay mechanism
US3645190A (en) * 1968-12-12 1972-02-29 Prontor Werk Gauthier Gmbh Photographic shutter with an electronic timing device
US3645186A (en) * 1968-12-09 1972-02-29 Kiyoshi Kitai Shutter opening and closing mechanism
US3650193A (en) * 1968-12-23 1972-03-21 Copal Co Ltd Bulb and time exposure control device for photographic camera
US3687045A (en) * 1969-12-01 1972-08-29 Prontor Werk Gauthier Gmbh Camera shutter mechanism

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4218588Y1 (de) * 1964-11-19 1967-10-27
JPS459671Y1 (de) * 1967-04-24 1970-05-06
US3618500A (en) * 1969-06-30 1971-11-09 Polaroid Corp Photographic exposure control system with automatic cocking mechanism

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507201A (en) * 1965-10-21 1970-04-21 Compur Werk Gmbh & Co Photographic shutter
US3525294A (en) * 1968-04-11 1970-08-25 Prontor Werk Gauthier Gmbh Shutter opening delay mechanism
US3645186A (en) * 1968-12-09 1972-02-29 Kiyoshi Kitai Shutter opening and closing mechanism
US3645190A (en) * 1968-12-12 1972-02-29 Prontor Werk Gauthier Gmbh Photographic shutter with an electronic timing device
US3650193A (en) * 1968-12-23 1972-03-21 Copal Co Ltd Bulb and time exposure control device for photographic camera
US3687045A (en) * 1969-12-01 1972-08-29 Prontor Werk Gauthier Gmbh Camera shutter mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236799A (en) * 1977-06-01 1980-12-02 Asahi Kogaku Kogyo Kabushiki Kaisha Unwinding-mechanism releasing device for use in a camera
US4803506A (en) * 1988-01-14 1989-02-07 Eastman Kodak Company Electromagnetic control device for cameras
EP0324423A2 (de) * 1988-01-14 1989-07-19 EASTMAN KODAK COMPANY (a New Jersey corporation) Elektromagnetische Steuervorrichtung für Kameras
EP0324423B1 (de) * 1988-01-14 1993-06-30 EASTMAN KODAK COMPANY (a New Jersey corporation) Elektromagnetische Steuervorrichtung für Kameras

Also Published As

Publication number Publication date
FR2167034A5 (de) 1973-08-17
JPS5443372B2 (de) 1979-12-19
JPS4866829A (de) 1973-09-13
DE2261610A1 (de) 1973-06-20
DE2261610B2 (de) 1977-05-26
GB1376688A (en) 1974-12-11

Similar Documents

Publication Publication Date Title
US3762297A (en) Electromagnetic control mechanism for electric shutter
US3839607A (en) Camera shutter power switch maintaining connection for cameras with electrically-operated shutters
US3464333A (en) Automatic exposure control camera for flash and daylight photography
US3722392A (en) Camera shutter with novel operating mechanism
US3650193A (en) Bulb and time exposure control device for photographic camera
US3829877A (en) Camera electric shutter with mechanical delay device
US3221626A (en) Mechanism for operating the reflecting mirror of single lens reflex cameras
US4396267A (en) Electromagnetic driving device for a camera
US3946413A (en) Shutter blade rebound preventive device for camera shutter
US3833915A (en) Electronic shutter apparatus for camera
US3777646A (en) Electronic shutter for photographic camera
US3812512A (en) Electronic shutter for photographic cameras
US3470808A (en) Photographic shutter operating means
US3840885A (en) Electronically controlled shutter mechanism for a camera
US3625128A (en) Camera self-timer
US4132474A (en) Electromagnetic release device for use in cameras
US4306797A (en) Electromagnetically driven shutter
US4327982A (en) Device for suppressing mirror bounce in single lens reflex camera
US3646869A (en) Electronic shutter for photographic cameras
US3849787A (en) Lens shutter with pre-view device for a photographic camera
US4112451A (en) Low-inertia electronic shutter
US3640202A (en) Single lens reflex camera
US3854143A (en) Shutter operating mechanism
US3847475A (en) Electric shutter control
US3362310A (en) Switching mechanism of shutter