Three-layer light guiding structure

• US 20100188868A1
• Filed: 01/26/2009
• Published: 07/29/2010
• Est. Priority Date: 01/26/2009
• Status: Abandoned Application

• Current Assignee: YUXI Technology Co., Ltd.
• Original Assignee: YUXI Technology Co., Ltd.
• Inventors: Chuang, Cheng-Yen, Chuang, Hsing-Lieh
• Application Number:
  US12/320,390
• Publication Number:
  US 20100188868A1
• Time in Patent Office: Days
• US Class Current: 362/619
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/006 to produce indicia, symbols, texts or the like
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects

Abstract

A three-layer light guiding structure includes a light-guiding layer having a light-output face with a plurality of patterned points imprinted thereon; a middle light-transmittable layer being located at a bottom of the light-guiding layer opposite to the light-output face; and a reflecting layer being located at a bottom of the middle light-transmittable layer opposite to the light-guiding layer. The three-layer light guiding structure is formed through the coextrusion molding process, so that the light-guiding layer, the middle light-transmittable layer and the reflecting layer are integrally formed and bonded to one another after the molding.

Claims

1. A three-layer light guiding structure, comprising:

a light-guiding layer having a light-output face, on which a plurality of patterned points is provided;

a middle light-transmittable layer being located below the light-guiding layer opposite to the light-output face; and

a reflecting layer being located below the middle light-transmittable layer opposite to the light-guiding layer; and

wherein the light-guiding layer, the middle light-transmittable layer and the reflecting layer are integrally formed to bond to one another through a coextrusion molding process.

2. The three-layer light guiding structure as claimed in claim 1, wherein the patterned points can be dots or pits.

3. The three-layer light guiding structure as claimed in claim 1, wherein the middle light-transmittable layer has a refractive index lower than that of the light-guiding layer.

4. The three-layer light guiding structure as claimed in claim 1, wherein the reflecting layer is made of a thermoplastic resin material, including polycarbonate (PC), and can have talc powder or titanium dioxide powder added thereto.

5. The three-layer light guiding structure as claimed in claim 3, wherein the light-guiding layer is made of a thermoplastic resin material, including PC, which has a refractive index of 1.58;

and the middle light-transmittable layer is made of a thermoplastic resin material, including polymethylmethacrylate (PMMA), which has a refractive index of 1.49.