Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-12-15
1996-08-20
Dzierzynski, Paul M.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359198, 384107, 347257, G02B 2608
Patent
active
055484379
ABSTRACT:
An optical deflector is provided with a scanning mirror which is rotatable about a shaft and accompanied by a sleeve and hub. The pneumatic pressure around the mirror which is located within a cavity formed by a motor case of the deflector is maintained lower than an inside pneumatic pressure of a pneumatic pressure creation arrangement. The arrangement has the shaft provided with herringbone grooves engraved on the periphery thereof and the sleeve rotatable about the shaft together with the hub and the scanning mirror. When the scanning mirror rotates about the shaft, windage loss may be reduced, and when the inside pneumatic pressure between the shaft and the sleeve is kept higher than the atmospheric pressure, the rigidity of the shaft may be maintained during the rotation of scanning mirror about the shaft.
REFERENCES:
patent: 4726640 (1988-02-01), Iwana et al.
patent: 4805972 (1989-02-01), Tanaka et al.
patent: 5069515 (1991-12-01), Itami et al.
Abstract of Japanese Laid-Open Appln. No. 63-160394, Jan. 17, 1990.
Takahashi Akiyoshi
Uchida Toshiya
Wakashima Rie
Yoshimoto Shigeka
Dzierzynski Paul M.
Schuberg Darren E.
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