Optical axis correction device

Details Optical axis correction device Optical axis correction device

1999-06-03

2000-12-05

Spyrou, Cassandra

Optical: systems and elements

Mirror

With support

359874, 359877, G02B 7182

Patent

active

061556904

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.

REFERENCES:
patent: 4664487 (1987-05-01), Tam
patent: 4680522 (1987-07-01), St. Clair et al.
patent: 4824253 (1989-04-01), Butler et al.
patent: 5751460 (1998-05-01), Harrell et al.

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