Flash synchronizing device

Claim 1

In a photographic camera having a movable distance setting element, an electrically operated automatic exposure control device, a programming shutter controlled by said device, said shutter having blades adapted to be opened to form an aperture, said aperture being varied by said device for obtaining proper exposure, whereby the shutter blades serve as a diaphragm, and flash synchronizing means, the improvement in the flash synchronizing means which comprises: a. M-contacts for a flash bulb; b. coupling means coupling said M-contacts with said shutter for closing said M-contacts substantially at the same time said shutter blades begin to be opened; c. a first variable resistor; d. motion transmitting means operatively interposed between said first variable resistor and said distance setting element for varying the resistance of said first variable resistor in response to movement of said distance setting element; e. circuit means including first switch means for connecting said first variable resistor with said exposure control device and for thereby increasing said aperture in response to an increase in the distance for which said distance setting element is set; f. X-contacts for an electronic flash device; g. coupling means coupling said X-contacts with said shutter for closing said X-contacts when said shutter blades begin to be closed after having been opened; h. a second variable resistor; i. motion transmitting means operatively interposed between said second variable resistor and said distance setting element for varying the resistance of said second variable resistor in response to movement of said distance setting element; j. selector switch means for alternatively connecting said first and second variable resistors to said automatic exposure control device when said first switch means is closed; k. third switch means in circuit with said M-contacts and movable between a contact-operating and a contact-inactivating position in which said third switch means make said M-contacts operative and inactive respectively; and l. coupling means coupling said third switch means to said selector switch means for moving said third switch means into the contact-operating position thereof when said selector switch means connects said first variable resistor to said automatic exposure control device, and for moving said third switch means into the contact-inactivating position when said selector switch means connects said second variable resistor to said automatic exposure control device.