Illumination – Illuminated scale or dial – Edge illuminated modifier or light rod/pipe
Patent
1997-08-08
1999-06-29
Sember, Thomas M.
Illumination
Illuminated scale or dial
Edge illuminated modifier or light rod/pipe
362 23, 362 29, 362 31, 362489, 385146, 385901, G01D 1128
Patent
active
059158220
ABSTRACT:
A transmitted illumination type meter comprises a transparent light transmitting board having both a light entering bore and a shaft passing bore formed therethrough; a translucent dial plate placed on a front surface of the board, the dial plate having a shaft passing opening mated with the shaft passing bore of the board; a movement positioned behind the board; a light source positioned within the light entering bore; a drive shaft extending from the movement to the outside of the dial plate through the shaft passing bore and the shaft passing opening; a transparent pointer connected to the drive shaft to move over a front surface of the dial plate; and an annular convex peripheral wall defining the light entering bore. The annular convex peripheral wall allows light beams from the light source to enter the board and travel in parallel in the same. A plurality of stepped annular light reflecting surfaces are formed on a rear surface of the board and arranged to be concentric with the light entering bore. The annular light reflecting surfaces reflect the light beams from the annular convex peripheral wall toward the front surface of the light transmitting board. A Fresnel lens is formed on the front surface of the board and arranged to be concentric with the light entering bore. The Fresnel lens projects the light beams from the annular light reflecting surfaces toward the dial plate.
REFERENCES:
patent: 4323951 (1982-04-01), Pasco
patent: 4975807 (1990-12-01), Ohashi
patent: 5790322 (1998-08-01), Kameda
Arai Kazuo
Higuchi Toshitaka
Ogura Akihiro
Takeyama Tetsuhide
Tone Masanori
Honeyman Marshall
Kansei Corporation
Sember Thomas M.
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