Flashlight information signal generating device for a camera

Details Flashlight information signal generating device for a camera Flashlight information signal generating device for a camera

Filed on

1977-04-21

Date issued

1978-05-09

Examiner

Hix, L. T.

Other Related Categories

354 34, 354145, G03B 1505

Type

Patent

Status

active

Patent number

040890139

Description

ABSTRACT:
In a camera having a light receiving element for receiving extraneous light, an integrating capacitor series-connected to the light receiving element, a control circuit for supplying a stop signal to a flashlight device through a connection cord between the camera and the flashlight device to cause the flashlight discharge tube of the flashlight device to stop emitting when the terminal of the capacitor has reached a predetermined value, and a synchro circuit having a synchro terminal and X-contact, there is provided a coil excitable by a current flowing from the flashlight device through the synchro terminal and X-contact to generate a voltage when the flashlight discharge tube has started to emit, the coil being series-connected to the X-contact, a transistor parallel-connected to the integrating capacitor so that in its conductive position, the transistor enables the capacitor to discharge and in its non-conductive position, the transistor enables the capacitor to be charged, and a switching circuit connected to the coil and the release mechanism of the camera so that upon detection of the voltage generated in the coil, the switching circuit assumes a first position to render the switching element non-conductive and upon completion of shutter release, the switching circuit assumes a second position to render the switching element conductive.

REFERENCES:
patent: B501503 (1976-03-01), Biber
patent: 3727100 (1973-04-01), Kuraishi et al.
patent: 3978496 (1976-08-01), Matsumoto

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