The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2001
Filed:
Jun. 26, 2000
Yukitsugu Hata, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A switching circuit is connected to an oscillation transistor of a charging circuit of a flash device of a lens-fitted photo film unit, for turning on or off the oscillation transistor. When a rear cover of a unit body of the film unit is separated, a battery for supplying the flash device is disconnected from the flash device through an insulating plate that is provided on the front cover. Thereafter when the battery or a new battery is connected to the flash device, a clear circuit outputs a clear signal to the switching circuit and a restoring circuit to initialize these circuits. In the initialized position, the switching circuit turns off the oscillation transistor, and maintains this switching condition until a restore signal is applied from the restoring circuit. The restoring circuit outputs the restore signal only when a predetermined cancel signal is applied from an external device. As the cancel signal, a voltage signal with a predetermined voltage level and a pulse signal with a predetermined pulse number have to be concurrently inputted to the restoring circuit within a predetermined time period.