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:
Sep. 12, 1989
Filed:
Jun. 20, 1988
Robert A Simms, Phoenix, AZ (US);
Murasa International, Long Beach, CA (US);
Abstract
An infrared flash unit, for use with camera employing infrared film, is mounted in a housing having a base configured to fit on the normal flash unit attachment of a standard camera. The housing has a front panel with an array of eight individual reflectors, each having an infrared light emitting diode or laser diode in it. A power supply is connected through a pulse driver circuit to the diodes, each of which are connected in series with a corresponding switch. The diode and switch combination are connected in parallel with one another and in series with the pulse driver circuit. Different combinations of diodes are selected for operation in accordance with the shutter speed and range of the camera. The pulse driver circuit supplies energizing pulses to the selected diodes at a repetition rate and duty cycle selected to match the primary infrared wave length of the diodes and the film used in the camera to reduce fogging due to background infrared light.