Illuminant module with optical film of multiple curvatures

• US 8,210,714 B2
• Filed: 01/14/2009
• Issued: 07/03/2012
• Est. Priority Date: 08/28/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chao, Chih-Chiang, Shiao, Po-Ling, Tseng, Yu-Tsan, Lai, Mei-Chun
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US12/353,945
• Publication Number:
  US 20100053954A1
• Time in Patent Office: 1,266 Days
• Field of Search: 362/235, 362/236, 362/244, 362/311.09, 362/311.1, 362/330, 362336-340, 362/311.02, 359/619, 359/624, 359/626, 359/831, 359/837, 359/455
• US Class Current: 362/235
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0278 used in transmission

Abstract

An Illuminant module includes an optical film and a light source array. The optical array includes a plurality of concave surfaces and a plurality of convex surfaces alternatively arranged along at least one direction, wherein each concave surface has a concave surface width along the at least one direction, and each convex surface has a convex surface width along the at least one direction. The light source array includes a plurality of light emitting diodes, wherein the concave surface width is not equal to the convex surface width, and the light from the light source array penetrates the optical film.

Claims

1. An illuminant module, comprising:

an optical film comprising a micro lens array comprising plurality of continuously curved concave surfaces and a plurality of continuously curved convex surfaces alternatively discontinuously conjunctionally arranged along at least a first direction and a second direction perpendicular to the first direction, wherein each of the concave surfaces has a concave surface width along the first direction, and each of the convex surfaces has a convex surface width along the first direction; and

a light source array comprising a plurality of light emitting diodes, wherein the concave surface width is not equal to the convex surface width, and the light from the light source array penetrates the optical film;

wherein the micro lens array is arranged on the opposite side of the optical film as the light source array;

wherein the concave surfaces and the convex surfaces are alternatively and conjunctionally arranged along the first direction, the second direction, and a third direction between the first and the second direction, wherein a profile of a cross-section of the micro lens array along the first direction is the same as a profile of a cross-section of the micro lens along the second direction.

2. The illuminant module as claimed in claim 1, wherein the concave surface has a maximum depth perpendicular to the first direction, and the convex surface has a maximum height perpendicular to the first direction, and the maximum depth is larger than ½

the concave surface width, and the height is larger than ½

the convex surface width.

3. The illuminant module as claimed in claim 1, wherein the concave surface width and the convex surface width are gradually larger along the first direction.

4. The illuminant module as claimed in claim 3, wherein the concave surface has a maximum depth perpendicular to the first direction, and the convex surface has a maximum height perpendicular to the first direction, and the maximum depth and the maximum height gradual increase along the first direction.

5. The illuminant module as claimed in claim 3, wherein the concave surface has a maximum depth perpendicular to the first direction, and the convex surface has a maximum height perpendicular to the first direction, and the maximum depth and the maximum height gradually decrease along the first direction.

6. The illuminant module as claimed in claim 1, wherein the concave surface width and the convex surface width decrease along the first direction.

7. The illuminant module as claimed in claim 1, wherein the concave surface has a maximum depth perpendicular to the first direction, and the convex surface has a maximum height perpendicular to the first direction, and the maximum depth and the maximum height gradually decrease along the first direction.

8. The illuminant module as claimed in claim 1, wherein the concave surface has a maximum depth perpendicular to the first direction, and the convex surface has a maximum height perpendicular to the first direction, and the maximum depth and the maximum height gradual increase along the first direction.

9. The illuminant module as claimed in claim 1, wherein the ratio of a distance from the light emitting diode to the optical film over a distance between a neighboring two of the plurality of light emitting diodes is less than 5.

10. The illuminant module as claimed in claim 1, wherein the distance of each light emitting diode to the optical film is equal.

11. The illuminant module as claimed in claim 1, wherein the distance of each light emitting diode to the optical film is not equal.

12. The illuminant module as claimed in claim 1, wherein the optical film is curved.