Gauge with illuminated dial and pointer
View Patent ↗A gauge with a light transmitting pointer and a light-transmitting dial plate having a surface with indicia for a variable represented by the dial, at least one light source facing a hub of the pointer and positioned rearwardly from the rear surface of the dial plate for illuminating the dial plate. The light-transmitting pointer is mounted for rotational movement about an axis normal to the dial plate. The pointer hub is concentric with the axis, extending through the dial plate and projecting both forwardly and rearwardly from the plate, and an indicator projecting laterally from the hub across a portion of the front surface of the dial plate. The portion of the hub extending rearwardly of the dial plate is shaped to capture light directly from the light source so that light enters the hub and propagates forwardly through the hub, and then laterally from the hub into the indicator to illuminate the indicator.
1. A gauge comprising:
a dial plate including a front surface;
a light-transmitting pointer configured for rotational movement about an axis normal to said dial plate, said pointer extending through the dial plate and having a hub concentric with said axis and an indicator projecting laterally from said hub over the front surface of said dial plate,
said hub having a tapered transition portion and a reflective surface configured to direct the light onto said indicator, said tapered transition portion configured to redirected light to said reflective surface of said hub;
at least one light source positioned rearwardly from a rear surface of said dial plate and proximate a perimeter of said dial plate, the at least one light source being configured to illuminate the front surface of the dial plate and the light-transmitting pointer; and
a light shield between said at least one light source and said dial plate and configured to direct light from the at least one light source toward the light-transmitting pointer and block light from transmitting along a direct path from the at least one light source to the dial plate in a direction normal to the dial plate.
2. The gauge of claim 1 , wherein said light shield is configured for reducing or eliminating hot spots from said front surface of said dial plate.
3. The gauge of claim 1 , wherein a width of said light shield is selected based on an angle of the light emitted from said at least one light source.
4. The gauge of claim 1 , wherein the at least one light source and said light shield are configured to illuminate the dial plate with a pattern of light having a shape different than said dial plate.
5. The gauge of claim 1 , further comprising:
a face plate that covers portions of the dial plate so that only non-covered portions of the dial plate are illuminated by said at least one light source.
6. The gauge of claim 1 , wherein said reflective surface is located in a recess in an upper surface of said hub.
7. The gauge of claim 1 , wherein said tapered transition is spherically shaped.
8. The gauge of claim 1 , wherein the angle between said axis and an outer surface of said tapered transition portion is about 45 degrees.
9. The gauge of claim 1 , wherein the angle between said axis and an outer surface of said tapered transition portion is about 15 degrees.
10. The gauge of claim 1 , wherein the angle between said axis and an outer surface of said tapered transition portion is about 60 degrees.
11. The gauge of claim 1 , wherein gauge is either a full or short sweep gauge.
12. The gauge of claim 1 , wherein said at least one light source are side-fire light-emitting diodes.
13. The gauge of claim 1 , further comprising:
a cup for reflecting the light from said at least one light source on to said rear surface of said dial plate.
14. The gauge of claim 1 , wherein said indicator comprises a reflective backing configured to receive the light from said reflective surface of said hub and to reflect the light away from the said dial plate.
15. A gauge having an illuminated dial and pointer, comprising:
a light-transmitting dial plate having a front surface;
a light-transmitting pointer configured for rotational movement about an axis normal to said dial plate, said pointer having a hub concentric with said axis, extending through said dial plate, and projecting both forwardly and rearwardly from said plate, and including an indicator projecting laterally from said hub across a portion of the front surface of said dial plate and an illuminating portion configured to redirect light from said hub laterally into said indicator;
at least one light source facing towards said hub and positioned rearwardly from a rear surface of said dial plate and proximate an outer perimeter of the dial plate, said light source being configured for illuminating the light-transmitting pointer, wherein said hub intercepts light from said light source, propagates the light forwardly to said illuminating portion, and thereby illuminates said indicator; and
a light shield positioned between said at least one light source and said dial plate and configured to direct light from the at least one light source toward the hub and block light from the at least one light source from transmitting along a direct path to the dial plate in a direction normal to the dial plate.
16. The gauge of claim 15 , wherein said light shield is configured for reducing or eliminating hot spots from said front surface of said dial plate.
17. The gauge of claim 15 , wherein the illuminating portion of said pointer is in a recess in an upper surface of said hub.
18. The gauge of claim 15 , wherein said gauge is either a full or short sweep gauge.
19. The gauge of claim 15 , wherein said at least one light source are side-fire light-emitting diodes.
20. The gauge of claim 15 , further comprising:
a cup for reflecting the light from said at least one light source on to said rear surface of said dial plate.
21. The gauge of claim 15 , wherein said hub comprises a small-diameter portion located behind said dial plate, a large-diameter portion extending through said dial plate, and a tapered transition portion between said small-diameter and large-diameter portions, said tapered transition portion being located closer to the rear surface of said dial plate than said light source and forming a tapered outer surface configured for intercepting light from said light source so that said light enters said hub, propagates forwardly through said hub, and redirects laterally from said illuminating portion of said pointer into said indicator.
22. The gauge of claim 21 , wherein said tapered transition is spherically shaped.
23. The gauge of claim 21 , wherein the angle between said axis and said tapered outer surface of the transition is about 45 degrees.
24. The gauge of claim 21 , wherein the angle between said axis and said tapered outer surface of the transition is about 15 degrees.
25. The gauge of claim 21 , wherein the angle between said axis and said tapered outer surface of the transition is about 60 degrees.
26. The gauge of claim 15 , wherein said indicator comprises a reflective backing configured to receive the light from said illuminating portion of said pointer.
27. A method of illuminating a gauge having a light-transmitting dial plate and a light-transmitting pointer having a hub and an indicator, said method comprising:
emitting light from a light source, the light source being provided at a perimeter portion of the gauge and rearward of the light-transmitting dial plate;
receiving the light from said light source at the light-transmitting dial plate and at a tapered outer surface of the light-transmitting pointer so that the light enters the light-transmitting dial plate and the light-transmitting pointer and propagates forwardly therethrough;
directing light from the light source toward the light-transmitting pointer using a light shield positioned between the light source and the light-transmitting dial plate; and
blocking non-reflected light from the light source from transmitting along a direct path to the light-transmitting dial plate in a direction normal to the light-transmitting dial plate.
28. The method of claim 27 , wherein said light source comprises multiple light-emitting diodes spaced around an axis of the pointer.
29. The method of claim 27 , wherein said tapered outer portion is spherically shaped.
30. The method of claim 27 , further comprising illuminating said dial plate with said light source using a plurality of light emitting diodes.
31. The method of claim 27 , further comprising:
reflecting the light from said light source on to said dial plate using a cup.
32. The method of claim 27 , wherein said light shield is configured for reducing or eliminating hot spots from said front surface of said dial plate.
33. A gauge having an illuminated dial face and pointer, comprising:
a dial plate having a front surface;
a hub configured to rotate and extending through the dial plate;
an indicator projecting laterally from the hub and over the front surface;
an illuminator configured to redirect light from the hub to the indicator;
at least one side fire LED light source directed toward said hub and positioned rearward of the dial plate and configured to indirectly illuminate the front surface and the indicator, wherein light from the light source is transmitted via said dial plate to the front surface and via the hub and the illuminator to the indicator; and
a light shield between the light source and the dial plate that directs light emitted from the light source toward the hub and prevents light emitted from the light source from transmitting along a direct path to the dial plate in a direction normal to the dial plate.