Patent ID: 6314239
Filing Date: 2001-11-06
Classification: G03B

Abstract:
A flash device for a lens-fitted photo film unit preloaded with a roll of unexposed photo filmstrip and having photographic mechanisms for photography on the filmstrip, the flash device comprising a charging circuit for charging a main capacitor, a battery connected to the charging circuit in a removable fashion, and a discharging circuit for discharging the main capacitor through a flash discharge tube, characterized by comprising:first means for outputting a restore signal when a pulse signal having a predetermined number of pulses and a voltage signal having a predetermined voltage level are concurrently inputted from an external device; andsecond means for switching a switching element connected to the charging circuit, such that the second means switches the switching element to a disabling position for disabling the charging circuit when a particular part of the film unit is removed or when completed use of the film unit is detected or when voltage of the battery goes below a lower limit, and that the second means switches the switching element to an enabling position for enabling the charging circuit to work in response to the restore signal.