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. 05, 2000
Filed:
Jun. 03, 1999
Kiyohiko Miyahara, Kanagawa, JP;
Kazuhiko Otsuka, Chiba, JP;
Yujiro Ito, Kanagawa, JP;
Toshihisa Iriyama, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In an optical axis correction device for correcting an optical axis within an optical spatial transmission device, a displacement of focal point can be prevented and a responding speed in rotation of the mirror can be made fast. As the incident light is reflected against the reflection surface of the mirror and radiated against the position sensing sensor, a displacement amount .DELTA.S between the incident point P1 on the position sensing sensor and the reference position P0 is detected at the optical axis correction device. In order to correct the optical axis only by the amount of displacement .DELTA.S, the Y-axis driving mechanism is driven to change an angle of the reflection surface of the mirror. At this time, the position of the reflecting portion on the reflection surface in a direction of Z-axis is prevented from being displaced. For example, a driving force of '-2' is applied to the first Y-axis driving mechanism and concurrently a state of '.+-.0' is held at the second Y-axis driving mechanism. With such an arrangement as above, it is possible to rotate the mirror in the same direction and by the same amount only as those of the case in which the driving force '-1' is applied to the first Y-axis driving mechanism and the driving force '+1' is applied to the second Y-axis driving mechanism without being displaced in a direction of the Z-axis.