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:
Dec. 25, 1990
Filed:
May. 22, 1989
Stephen P Merrick, San Jose, CA (US);
Joseph Pernyeszi, Scotts Valley, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A high voltage optical isolator has a light emitting diode which illuminates a photodetector for conveying a signal by optical means while isolating the input voltage from the output. The LED is spaced from the photodetector by an extension on an opaque reflective light guide around the optical path between the LED and photodetector. The light guide has a transparent silicone resin medium in a light passage between the LED and photodetector. The internal and external portions of the light guide provide elongated crooked paths for enhancing electrical breakdown resistance. The entire optical isolator is packaged in a conventional DIP. Isolation voltages of 5,000 volts or more and enhancement of light flux coupling up to 300% are obtained.