Optical data reader capable of quickly changing a condensing pos

Details Optical data reader capable of quickly changing a condensing pos Optical data reader capable of quickly changing a condensing pos

1994-09-01

1996-03-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359290, 359846, 359666, 250568, H01J 314

Patent

active

054988683

ABSTRACT:
An optical data reader including a device for producing a light beam, and a device for changing a condensing position of the light beams before the light beam is reflected from a target such as a bar code. The device for changing the condensing position is either a variable focus lens or mirror, each adapted to change the curvature of the surface of the lens or mirror in order to move the condensing position cyclically and continuously. The variable focus mirror changes the shape of its reflecting surface in response to electrical signals from a driving circuit. Excess pressure within the mirror caused by the mirror surface being attracted inwards is expelled through intake/outlet ports formed in the drive electrode. The variable focus lens alters the focal length of the lens each time the curvature of the surface thereof is changed. Preferably, the curvature of the lens surface is changed by increasing fluid pressure within the lens, while the curvature of the variable focus mirror is electrically driven. Either the variable focus lens or mirror is disposed in the optical path between the light source and the target. The light source is usually a laser or laser diode.

REFERENCES:
patent: 4128309 (1978-12-01), Lehureau et al.
patent: 4420222 (1983-12-01), Bret et al.
patent: 5122644 (1992-06-01), Hasegawa et al.
patent: 5233470 (1993-08-01), Wu
Fujita, et al., An Integrated Micro Servosystem, 1988 IEEE International Workshop on Intelligent Robots and Systems (IROS '88), pp. 15-20, Oct. 31-Nov. 2, 1988, Tokyo, Japan.

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