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US 7,126,564 B2Granted
Illumination and display device
AssigneeRobert Bosch GmbH
InventorsHarald Schach, Georg Ewald
Life of this patent
Estimating the term…
Abstract
An illumination device for a display instrument is described which is used to illuminate two sets of scale markings and to separately illuminate a pointer scale of the display instrument. The light from a light source is guided past light funnels that are used to illuminate the pointer scale by an optical waveguide. This provides an efficient and economical means of illuminating a display instrument of this type.
Claims16
An illumination device for a display instrument, comprising:
- a dial face;
- a pointer scale arranged on the dial face;
- a first scale marking of the pointer scale arranged on a first side of the pointer scale on the dial face;
- at least one of a second scale marking of the pointer scale and an auxiliary scale arranged on a second side of the pointer scale on the dial face;
- a first light source for illuminating the first scale marking;
- an optical waveguide into which a light of the first light source is injected, the light being deflected from the optical waveguide to the second scale marking;
- at least one second light source for illuminating the pointer scale;
- and
- a light funnel arranged between the at least one second light source and the pointer scale, wherein:
- a light path from the at least one second light source to the pointer scale is separated from the optical waveguide by the light funnel.
7 more elements
A display instrument, comprising:
- an illumination device that includes:
- a dial face,
- a pointer scale arranged on the dial face,
- a first scale marking of the pointer scale arranged on a first side of the pointer scale on the dial face,
- at least one of a second scale marking of the pointer scale and an auxiliary scale arranged on a second side of the pointer scale on the dial face,
- a first light source for illuminating the first scale marking,
- an optical waveguide into which a light of the first light source is injected, the light being deflected from the optical waveguide to the second scale marking,
- at least one second light source for illuminating the pointer scale, and
- a light funnel arranged between the at least one second light source and the pointer scale, wherein:
- a light path from the at least one second light source to the pointer scale is separated from the optical waveguide by the light funnel.
7 more elements
A cruise control display in a vehicle, comprising:
- a processing unit;
- and
- a display instrument including an illumination device that includes:
- a dial face,
- a pointer scale arranged on the dial face,
- a first scale marking of the pointer scale arranged on a first side of the pointer scale on the dial face,
- at least one of a second scale marking of the pointer scale and an auxiliary scale arranged on a second side of the pointer scale on the dial face,
- a first light source for illuminating the first scale marking,
- an optical waveguide into which a light of the first light source is injected, the light being deflected from the optical waveguide to the second scale marking,
- at least one second light source for illuminating the pointer scale, and
- a light funnel arranged between the at least one second light source and the pointer scale, wherein:
- a light path from the at least one second light source to the pointer scale is separated from the optical waveguide by the light funnel,
- an actual vehicle speed is displayed by the cruise control display by a pointer, and
- a desired speed is displayed by the cruise control display by illuminating segments of the pointer scale of the display instrument.
11 more elements
Dependencies are inferred from the claim text.