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LIGHT BALANCING FOR MULTIPLE GAUGES

IP.com Disclosure Number: IPCOM000005541D
Original Publication Date: 1984-Apr-01
Included in the Prior Art Database: 2001-Oct-12
Document File: 2 page(s) / 63K

Publishing Venue

Motorola

Related People

Tom R. Kawall: AUTHOR

Abstract

An instrument cluster of multiple gauges is uniformly illuminated from a single light source which is generally centrally located in the cluster.

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This is the abbreviated version, containing approximately 98% of the total text.

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1 MOTOROLA Technical Developments Volume4 April 1984

LIGHT BALANCING FOR MULTIPLE GAUGES

by Tom R. Kawall

An instrument cluster of multiple gauges is uniformly illuminated from a single light source which is generally centrally located in the cluster.

   An optical grade material adjacent to the periphery of the gauge faces and also disposed therebetween mixes and transmits light from the light source 11 to the various gauge faces. Exterior surfaces 12 in Fig. 2 are vacuum metalized to provide light reflectivity. Circular areas 13 about the instrument faces are unmetalized and clear permitting light to exit and illuminate the faces. These exit areas 13 can be painted with pigments to provide a desired color of light.

   An important feature is the provision of slots or apertures 14 as voids in the optical material to balance or otherwise control the amount of illumination to certain instrument faces. Proper selection of the shape and size of slots 14 accomplishes this objective. Basically, the slots act to block light transmittance therethrough and also reflect the blocked light to other parts of the instrument cluster. Instead of voids in this material, the slots 14 could alternatively be an opaque light blocking medium molded or inserted at the desired light blocking areas.

13 Motorola, Inc. 1964 40

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MOTOROLA Technical Developments Volume 4 April 1984

14

0 Motorola, Inc. 1984 41

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