Optics: image projectors – Pointer
Patent
1994-04-18
1995-09-12
Will, Thomas B.
Optics: image projectors
Pointer
353 43, 362259, G03B 2100
Patent
active
054501482
ABSTRACT:
A laser pointer for projecting a laser beam with a selectable pointer pattern onto a projected screen during presentations comprising a shell body, a laser beam generating device, and a pointer pattern selector; the laser beam generating device is disposed in the front portion of the shell body and the pointer pattern selector is disposed in the rear portion of the shell body. The pointer pattern selector comprises a plurality of pointer patterns of varying geometric shapes and/or sizes, and the user can place one of the pointer patterns in the laser beam path using a rotational assembly or a horizontal shifting method so as to project a laser beam having the desired pointer pattern onto the projected screen. A magnifying lens is placed before each pointer pattern to enlarge the cross-sectional area of the laser beam to be projected through the selected pointer pattern. The magnifying lens can be in the form of a cylindrical lens so as to project a line-shaped pointer pattern.
REFERENCES:
patent: 3656845 (1972-04-01), Koch-Bossard et al.
patent: 4060318 (1977-11-01), Hansford
patent: 4097134 (1978-06-01), Jerie
patent: 4779176 (1988-10-01), Bornhorst
patent: 5268829 (1993-12-01), Lo
patent: 5321449 (1994-06-01), Coccoli et al.
Ni Ray-Ing
Shu Lin Y.
Dowling William C.
Liauh W. Wayne
Liauh Wei-Chang W.
Lin Fang-Ing
Lin Yu S.
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