Lamp assembly for emitting a beam of light at an angle to its optical axis

• US 4,722,023 A
• Filed: 05/13/1985
• Issued: 01/26/1988
• Est. Priority Date: 05/15/1984
• Status: Expired due to Term

• Current Assignee: Koito Seisakusho Company Limited
• Original Assignee: Koito Seisakusho Company Limited
• Inventors: Arima, Kenji, Satsukawa, Hideaki, Kobayashi, Syoji
• Primary Examiner(s): Yeung, James C.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/733,573
• Time in Patent Office: 988 Days
• Field of Search: 362/309, 362/310, 362/337, 362/61, 362/80, 362/297, 362/311307, 362/347, 362/348, 362/342
• US Class Current: 362/503
• CPC Class Codes: B60Q 1/302 mounted in the vicinity, e.g. in the middle, of a rear window

Abstract

A lamp assembly is disclosed as adapted for use as a supplemental high mounted stop lamp for motor vehicles. A lamp body has a paraboloidal reflector for producing parallel rays of light from a source mounted therein. For reducing the axial dimension of the lamp body to a minimum, a generally planar lens is mounted at its open front end, with the lens having a multiplicity of prism elements formed on its outer surface for internally reflecting the parallel rays in a direction at a considerable angle to the axis of the reflector. Additional embodiments are disclosed for imparting both lateral and vertical divergence to the light beam emitted, and for producing two vertically overlapping light beams.

Claims

1. A high mounted stop lamp assembly adapted to be mounted along the inside surface of an inclined rear window of a motor vehicle, said lamp assembly comprising:

(a) a lamp body having an open front end;

(b) a light source mounted within the lamp body for producing light;

(c) a reflector provided inside of the lamp body with the configuration thereof being such that the light produced by the light source is reflected by the reflector as rays of light parallel to the optical axis of the lamp assembly;

(d) a lens assembly covering the open end of the lamp body and extending generally along a plane perpendicular to the optical axis of the lamp assembly, said lens assembly including generally parallel inner and outer lenses;

(e) said inner lens having a plurality of diverging lens elements for diverging the rays of light reflected by the reflector into sidewise directions with respect to the motor vehicle;

(f) said outer lens directing said rays of light to the direction rearwards of the motor vehicle;

(g) a plurality of spaced parallel, linearly and horizontally extending prism elements being integrally formed on the outer surface of said outer lens, each of said prism elements having a generally triangular cross-section with one side thereof acting as a light reflecting surface; and

(g) a plurality of light converging elements integrally formed on the inner surface of said outer lens for converging said rays of light onto the reflecting surfaces of said prism elements.

2. The high mounted stop lamp assembly of claim 1 wherein said light converging elements are spaced parallel and horizontally extending ridges of generally convex form are arranged corresponding to said prism elements.

3. The high mounted stop lamp assembly of claim 1 wherein said light reflecting surface is a planar surface.

4. The high mounted stop lamp assembly of claim 1 wherein said light reflecting surface is a concave surface as viewed in the cross-section, so that the light reflected by the reflecting surface is scattered in a predetermined range.

5. The high mounted stop lamp assembly of claim 1 wherein said outer lens is composed of at least two sections which are divided as viewed in the direction of the optical axis of the lamp assembly, said respective sections being adapted to throw beams of light which are parallel to each other, while intersecting at an angle with respect to each other and in a partially overlapping relation to each other.

6. The high mounted stop lamp assembly of claim 5, wherein said outer lens comprises two sets of prism elements, with the direction of the reflection of each set of the prism elements being different from each other.

7. The high mounted stop lamp assembly of claim 5, wherein said outer lens comprises two sets of light converging elements which are not parallel to each other.

8. The high mounted stop lamp assembly of claim 5, wherein said outer lens comprises two sets of light converging elements with the optical axis of each set of the light converging elements not being parallel to each other.