Pointer illuminating structure in measuring instrument

Details Pointer illuminating structure in measuring instrument Pointer illuminating structure in measuring instrument

1988-02-22

1989-08-22

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 31, 362 32, 116288, G01D 1128

Patent

active

048601705

ABSTRACT:
A pointer illuminating structure in a measuring instrument. A pointer of the measuring instrument is of a generally elongated structure and transparent. At an intermediate portion thereof, a light inducing section is provided to extend substantially perpendicularly to the generally elongated structure to form a T shape. The pointer has a flat upper surface and lower surfaces extending from about both side of the light inducing section. A reflective material is applied to the lower surfaces. Beneath the upper surface and above levels of the lower surface, cavities laterally extend to open sideways. Said cavities are defined by reflective surfaces. In alternative form, said elongated pointer is formed with a truncated conical portion at the light inducing section. Said truncated conical portion has a truncated conical reflective surface. The reflective material is applied to the side surfaces instead of the lower surface thereof.

REFERENCES:
patent: 2831453 (1958-04-01), Hardesty
patent: 3129691 (1964-04-01), Walker
patent: 4218726 (1980-08-01), Fukasawa et al.
patent: 4252078 (1981-02-01), Fukasawa et al.
patent: 4300470 (1981-11-01), Furukawa
patent: 4380043 (1983-04-01), Takamatsu et al.
patent: 4625262 (1986-11-01), Sakaleibara et al.

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