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. 07, 2000
Filed:
Feb. 18, 1999
Douglas W Constable, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An optical data recording circuit suitably adapted for a low cost, one-time-use camera in which an LED optical recording device is connected via a switch device from one terminal of a battery supply to the base of an oscillator transistor in an oscillator charging circuit. The base of the oscillator transistor is connected via a resistor to the other terminal of the battery supply and via an oscillator charger circuit ON/OFF switch and secondary winding of the charger step-up transformer to the first terminal of the battery supply. The battery is such that its no-load output voltage is sufficient to illuminate the LED. When the switch device is closed to initiate recording of an optical data bit on film in the camera, the LED is illuminated from the battery no-load output voltage if the ON/OFF switch is open and the charging circuit is not running. If the ON/OFF is being held closed while taking a picture, the LED is then illuminated by pulses from the oscillator circuit step-up transformer, preferably by flyback pulses from the transformer secondary winding to the base of the oscillator transistor.