Apparatus for, and method of, recording and viewing laser-made i

Details Apparatus for, and method of, recording and viewing laser-made i Apparatus for, and method of, recording and viewing laser-made i

1978-07-31

1980-04-29

Gellner, Michael L.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76L, G01D 1500

Patent

active

042008751

ABSTRACT:
Apparatus for, and method of, recording with radiation from a laser light beam a preselected pattern, that is transparent and/or opaque, on a target made of high gain retroreflective sheeting of the exposed-lens type, with the target inclined at a previously chosen angle; and, thereafter, viewing the recorded image of the pattern (which is recorded on the target by structural alteration, i.e., modification, of the target material that is caused by the laser light beam radiation), solely with the naked eye and in ambient light. The recorded image can be seen only when the target is inclined at the same angle at which the target was positioned when the pattern was recorded by the laser light beam radiation on the target.

REFERENCES:
patent: 2326624 (1943-08-01), Gebhard et al.
patent: 3154872 (1964-11-01), Nordgren
patent: 3708378 (1973-01-01), Tung
patent: 4032861 (1977-06-01), Rothrock
patent: 4036552 (1977-07-01), Lee et al.
patent: 4082426 (1978-04-01), Brown
3M Co. Product Bulletin, Sep. 15, 1970.
3M Co. Price List, May 1, 1971.

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