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. 12, 1991
Filed:
May. 16, 1989
Sony Corporation, Tokyo, JP;
Abstract
In an optical atmospheric link system for transmitting a light beam carrying an information signal between a transmitter and a receiver which is located apart from the transmitter, the transmitter includes a light source for generating the first light beam modulated with the information signal, a first optical system for transmitting the light beam toward the receiver, a second optical system for turning at least a portion of the light beam, and a third optical system for observing the light beam turned by the second optical system and the receiver. Also, the receiver includes a first detector for receiving the first light beam transmitted from the transmitter through the first optical system, detecting a relative position of the first light beam received and the receiver and for generating a position error signal, a second light source for generating a second light beam modulated with the position error signal, and a second optical system for transmitting the second light beam generated by the second light source toward the transmitter, wherein the transmitter further includes a second detector for receiving the second light beam transmitted from the receiver through the second optical system and demodulating the second light beam to obtain the position error signal, and a position control circuit for controlling a position of the transmitter according to the position error signal obtained by the second detector so that the light beam is directed toward the receiver.