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:
Mar. 14, 2000
Filed:
Feb. 18, 1999
Douglas W Constable, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An optical data recording circuit includes an optical recording device normally illuminated from a camera battery means in conjunction with initiation of flash illumination in the camera flash illumination circuit. The data recording circuit includes a first charging circuit path having a charging diode and an auxiliary charge storage capacitor for maintaining a charge voltage substantially equal to battery no-load voltage. The optical recording device, typically an LED, is connected to the charge voltage point of the first circuit and, through a switch device to a return terminal of the battery. When the switch device is closed in conjunction with initiating flash illumination, the LED is illuminated by the battery through the charging diode of the first circuit path. If, however, load on the battery from another circuit, such as the flash charging circuit, causes battery voltage to drop below a level needed to effect illumination of the recording device, the auxiliary storage capacitor charge voltage operates to effect illumination of the recording device.