Focus changing apparatus and method for optical scanners

Details Focus changing apparatus and method for optical scanners Focus changing apparatus and method for optical scanners

1991-09-25

1992-12-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359216, H01J 314

Patent

active

051736039

ABSTRACT:
A focus changing apparatus and method for an optical scanner which can easily be adapted to existing optical scanners or can provide the front end for a new scanner. The laser beam focus changing apparatus may be optically located between a laser source and a mirrored spinner and includes a plurality of spherical mirror segments having a predetermined radius. Each is located at its respective radius from a common axis. A rotating device, such as a motor, rotates the spherical mirror segments about their common axis. The spherical mirror segments may be mounted on top of the mirrored spinner. If so, the focus changing apparatus may additionally include a deflector mirror for deflecting the beam towards the spherical mirror segments and a spherical mirror adjacent the deflector mirror is optically located to receive the beam after it is reflected from the spherical mirror segments and to redirect the beam towards the mirrored spinner.

REFERENCES:
patent: 3924937 (1975-12-01), Munroe et al.
patent: 4370654 (1983-01-01), Krutsch
patent: 4413878 (1983-11-01), Lettington
patent: 4461534 (1984-07-01), Runciman
patent: 4624528 (1986-11-01), Brueggemann
patent: 4733072 (1988-03-01), Lettington
patent: 4938551 (1990-07-01), Matsumoto

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