Metallized high intensity gauge pointer

• US 5,911,492 A
• Filed: 10/15/1996
• Issued: 06/15/1999
• Est. Priority Date: 10/15/1996
• Status: Expired due to Fees

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delco Electronics Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Krasny, John M., Perry, Kenneth David
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): LEE, DAVID B
• Application Number:
  US08/732,559
• Time in Patent Office: 973 Days
• Field of Search: 362/26, 362/29, 362/30
• US Class Current: 362/26
• CPC Class Codes: B60K 2360/336 Light guides
• CPC Class Codes: B60Q 3/14 lighting through the surface to be illuminated
• CPC Class Codes: G01D 11/28 Structurally-combined illuminating devices
• CPC Class Codes: G01D 13/28 with luminescent markings

Abstract

A transparent pointer has a rear surface coated with white paint and the remainder is covered by a highly reflective metal layer except for a light emitting indicator strip and a light receiving surface. Stationary high flux LEDs mounted behind the pointer illuminate the light receiving surface. Received light is efficiently reflected to the indicator strip to produce a bright line suitable for viewing through a dark face plate to achieve a dark dead front appearance. To avoid reflections from the pointer the reflective layer is covered with a black film.

Claims

1. A gauge pointer for illumination by a stationary light source comprising:

a transparent pointer body having a front face including an elongated narrow indicator strip bounded on each side by front marginal portions, and a rear face having a mounting hub and a light receiving area adjacent the hub; and

a reflective coating on all of the body surface exclusive of the light receiving area and the indicator strip whereby light entering the receiving area is efficiently internally reflected and emitted at the indicator strip to produce a line of light, the reflective coating comprising white paint on the rear face and a metallic film which also covers the white paint on the rear face.

2. An instrument assembly comprising:

a cluster housing;

a gauge mechanism supported in the housing;

a pointer carried by the gauge mechanism for rotation about an axis;

,

a bright stationary light source mounted between the gauge mechanism and the pointer adjacent the axis for illuminating the pointer;

the pointer including a transparent pointer body having a front face including an elongated narrow indicator strip bounded on each side by front marginal portions, and a light receiving area adjacent the axis for illumination by the light source; and

a reflective coating on all of the body exclusive of the light receiving area and the indicator strip whereby light entering the receiving area is efficiently internally reflected and emitted at the indicator strip to produce a line of light, the reflective coating comprising white paint on the rear face and a metallic film which also covers the white paint on the rear face.

3. An instrument assembly comprising:

a cluster housing;

a gauge mechanism supported in the housing;

a pointer carried by the gauge mechanism for rotation about an axis;

a bright stationary light source mounted between the gauge mechanism and the pointer adjacent the axis for illuminating the pointer, such light source including lamps for producing different colors of light to afford different pointer colors;

the pointer including a transparent pointer body having a front face including an elongated narrow indicator strip bounded on each side by front marginal portions, and a light receiving area adjacent the axis for illumination by the light source; and

a reflective coating on all of the body exclusive of the light receiving area and the indicator strip whereby light entering the receiving area is efficiently internally reflected and emitted at the indicator strip to produce a line of light, the reflective coating on the rear face comprising white paint.