Indicating instrument having light conducting plate
First Claim
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1. An indicating instrument including a dial plate, a light conducting plate disposed on the back of said dial plate and a generally straight illumination lamp disposed at the back of said light conducting plate, said light conducting plate comprising:
- a generally flat circumferential light conducting section for illuminating said dial plate;
a light incidence section disposed integrally with said light conducting section having a light incidence back surface directly facing said lamp and a light reflecting front surface disposed to correspond to said light incidence back surface;
whereinsaid light incidence back surface comprises a notched portion having an inclined surface facing said lamp at an angle with respect to said light reflecting front surface,said light reflecting front surface comprises a curved surface for reflecting incident light of said inclined surface toward said circumferential light conducting section, andsaid angle of said inclined surface with respect to said curved surface is in a range so that incidence light of said light incidence back surface is totally reflected on said curved surface.
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Abstract
An indicating instrument has a generally straight illumination lamp and a light conducting plate. The light conducting plate has V-shaped notches near the lamp at the back thereof and curved surfaces at the front thereof. The V-shaped notches have inclined surface for receiving light from the lamp and transmitting it to the curved surfaces. The light from the lamp is totally reflected by the curved surface to illuminate a dial plate effectively.
50 Citations
7 Claims
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1. An indicating instrument including a dial plate, a light conducting plate disposed on the back of said dial plate and a generally straight illumination lamp disposed at the back of said light conducting plate, said light conducting plate comprising:
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a generally flat circumferential light conducting section for illuminating said dial plate; a light incidence section disposed integrally with said light conducting section having a light incidence back surface directly facing said lamp and a light reflecting front surface disposed to correspond to said light incidence back surface; wherein said light incidence back surface comprises a notched portion having an inclined surface facing said lamp at an angle with respect to said light reflecting front surface, said light reflecting front surface comprises a curved surface for reflecting incident light of said inclined surface toward said circumferential light conducting section, and said angle of said inclined surface with respect to said curved surface is in a range so that incidence light of said light incidence back surface is totally reflected on said curved surface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An indicating instrument comprising:
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a dial plate; a light conducting plate disposed on the back of said dial plate and a generally straight illumination lamp disposed at the back of said light conducting plate;
whereinsaid light conducting plate comprises a generally flat light conducting section for illuminating said dial plate;
a light incidence section disposed integrally with said light conducting section having a light incidence back surface directly facing said lamp and a light reflecting front surface disposed to correspond to said light incidence back surface,said light incidence back surface comprises a notched portion having an inclined surface facing said lamp at an angle with respect to said light reflecting front surface, said light reflecting front surface comprises a curved surface for reflecting incident light of said inclined surface toward said light conducting section, said angle of said inclined surface with respect to said curved surface is in a range so that incidence light of said light incidence back surface is totally reflected on said curved surface, and said illumination lamp comprises a plurality of light emitting elements and a printed circuit board for supporting said plurality of light emitting elements and supplying electric power thereto.
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Specification