Area type light emitting device and manufacturing method thereof

• US 6,518,691 B1
• Filed: 05/19/2000
• Issued: 02/11/2003
• Est. Priority Date: 05/31/1999
• Status: Expired due to Fees

• Current Assignee: Vista Peak Ventures LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: NEC Corporation
• Inventors: Baba, Masatake
• Primary Examiner(s): Patel, Vip
• Assistant Examiner(s): BERCK, KENNETH A
• Application Number:
  US09/575,093
• Time in Patent Office: 998 Days
• Field of Search: 313/113, 313/114, 313/634, 313/491, 313/573
• US Class Current: 313/113
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects

Abstract

An area type light emitting device, in which a reflection component can be firmly fixed to a transparent light guide component, and the manufacturing cost of the device can be reduce, is provided. At the area type light emitting device, in which the reflection component is disposed on the reverse face of the transparent light guide component, and also a light source is disposed at the side of the transparent light guide component, makes light emit from the surface of the transparent light guide component by that emitted light from the light source is inputted to the transparent light guide component and the inputted light is reflected on the reflection component and the reflected light is passed through the surface of the transparent light guide component, at the time when a reflection pattern, which makes the emitted light from the light source reflect to the surface of the transparent light guide component, is formed on the reverse face of the transparent light guide component, the reverse face of the transparent light guide component and the reflection component are fixed by welding in a state that the reflection pattern is formed between the reverse face of the transparent light guide component and the reflection component.

Claims

1. An area type light emitting device, comprising a reflection component disposed on a reverse face of a transparent light guide component, and a light source disposed at a side of said transparent light guide component, for making light emit from an emitting surface of said transparent light guide component by said emitted light from said light source input into said transparent light guide component, wherein said inputted light is reflected by a plurality of reflection patterns formed along portions of said reverse face of said transparent light guide component backed by corresponding portions of said reflection component, and said reflected light is passed through said emitting surface of said transparent light guide component, wherein:

said reflection patterns, which make said emitted light from said light source reflect to said emitting surface of said transparent light guide component, are formed on said portions of said reverse face of said transparent light guide component, and said portions of said reverse face of said transparent light guide component and said corresponding portions of said reflection component are joined by welding to form a continuous single piece construction.

2. A manufacturing method of an area type light emitting device, in which a reflection component is disposed on a reverse face of a transparent light guide component, and a light source is disposed at a side of said transparent light guide component, wherein light is emitted from an emitting surface of said transparent light guide component by the emitted light from said light source input into said transparent light guide component and said inputted light is reflected by a plurality of reflection patterns formed along portions of said reverse face of said transparent light guide component backed by corresponding portions of said reflection component, and said reflected light is passed through said emitting surface of said transparent light guide component, wherein:

said reflection patterns are formed on said reverse portions of said face of said transparent light guide component, and said portions of said reverse face of said transparent light guide component and said corresponding portions of said reflection component are joined by welding to form a continuous single piece construction.

3. A manufacturing method of an area type light emitting device, in which a reflection component is disposed on a reverse face of a transparent light guide component, and a light source is disposed at a side of said transparent light guide component, wherein light is emitting from an emitting surface of said transparent light guide component by the emitted light from said light source input into said transparent light guide component and said inputted light is reflected buy a plurality of reflection patterns formed along portions of said reverse face of said transparent light guide component backed by corresponding portions of said reflection component, and said reflected light is passed through said emitting surface of said transparent light guide component, wherein:

said reflection patterns are formed along said portions of said reverse face of said transparent light guide component when said transparent light guide component is molded, and said portions of said reverse face of said transparent light guide component and said corresponding portions of said reflection component are joined by welding to