Title:
CAMERA
Document Type and Number:
Japanese Patent JP2963013
Kind Code:
B2
Abstract:
PURPOSE: To detect the movement of a film in a low voltage state by controlling a current used for a current limiting means with a pulse, for limiting the current used for a film detecting means, so as to actuate it at a low voltage.
CONSTITUTION: Reduction in a power supply voltage is prevented by a diode 1-26 to evade fluctuations in a voltage and further, the power supply voltage before a high load is connected is maintained by a capacitor 1-25. Then, a load circuit 1-13 is connected to inspect the internal resistance of a power source and attain pulse drive for limiting the current flowing in the diode of a film movement detecting element 1-22 in a required range. The pulse drive is 10mS-50mS in the system of using the light reflection of a hole part as a perforation on the film, for instance, so that ≤10mS pulse is required. Thus, in the adoption of an optical detecting system, a voltage circuit is not required in particular and an element working at the low voltage and emitting light is not required as well.
Inventors:
NAGATA TOSHIO
Application Number:
JP24400394A
Publication Date:
October 12, 1999
Filing Date:
October 07, 1994
Export Citation:
Assignee:
KYANON KK
International Classes:
G03B1/60; G03B17/00; (IPC1-7): G03B17/00; G03B1/60
Domestic Patent References:
| JP5785041A | ||||
| JP7114073A |
Attorney, Agent or Firm:
Marushima Giichi