Coherent light generators – Particular resonant cavity – Specified cavity component
Reexamination Certificate
2006-06-02
2008-12-30
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular resonant cavity
Specified cavity component
C372S107000, C372S034000, C359S820000
Reexamination Certificate
active
07471712
ABSTRACT:
Because a focal distance of a condenser lens is changed due to a change in temperature, when irradiation of a laser beam is restarted after the irradiation has stopped, it takes a long time to restore a temperature of the cooled lens to a given temperature, and the operating efficiency is deteriorated. A first mirror5that can be located at a reflection position I at which an optical path is blocked and a laser beam a is reflected, and a second mirror6that reflects the laser beam a which is reflected by the first mirror5are disposed between the condenser lens2and the object to be irradiated4. The first mirror5is located at the reflection position I so that the laser beam a that is transmitted through the condenser lens2is sequentially reflected by the first and second mirrors5and6, and an intensity of the laser beam a that is again reflected by the first mirror5is made to coincide with an intensity of the laser beam a that is reflected from the object to be irradiated4, and the condenser lens2is heated in the same manner that the processing laser beam a is transmitted through the condenser lens2and irradiated on the object to be irradiated4.
REFERENCES:
patent: 04-167990 (1992-06-01), None
patent: 11-037895 (1999-02-01), None
patent: 2004/038775 (2004-05-01), None
Chung Suk-hwan
Shida Junichi
Uryu Shuichi
Golub Marcia A.
Harvey Minsun
The Japan Steel Works Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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