Device for measuring size of light spot

Details Device for measuring size of light spot Device for measuring size of light spot

1988-12-02

1990-04-17

Evans, F. L.

Optics: measuring and testing

Lamp beam direction or pattern

G01J 100

Patent

active

049174894

ABSTRACT:
A light beam spot size measuring device comprises an optical magnifying system. The magnifying system receives an image of the recording light beam spot formed within an optical recording apparatus, and magnifies it. Then the converter receives the magnified image of the beam spot formed on the pickup surface thereof so as to produce an output signal representing the size of the beam spot. An attenuator device attenuates the intensity of the image of the laser beam spot during magnification. The image of the beam spot therefore can be currently measured on the basis of the output signal even with the high intensity of the recording light beam.

REFERENCES:
patent: 4160598 (1979-07-01), Firester et al.

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