Optical film having luminous flux

• US 7,768,710 B2
• Filed: 07/31/2008
• Issued: 08/03/2010
• Est. Priority Date: 08/31/2007
• Status: Expired due to Fees

• Current Assignee: Gigastorage Corporation
• Original Assignee: Gigastorage Corporation
• Inventors: Yang, Stephen, Tsai, Tsung-Shien
• Primary Examiner(s): Mack; Ricky L
• Assistant Examiner(s): Greece; James R
• Application Number:
  US12/183,870
• Publication Number:
  US 20090059382A1
• Time in Patent Office: 733 Days
• Field of Search: 359/599, 359/619, 428/1.1, 264/1.1, 264/1.34, 362627-628
• US Class Current: 359/641
• CPC Class Codes: G02B 27/0972 Prisms prisms per se G02B5/04
• CPC Class Codes: G02B 5/045 Prism arrays

Abstract

An optical film has symmetrical arrangement light-collecting units. The light-collecting units can be extended for several times. The light-collecting unit has apex angles and base angles with different degrees. Thus, a uniform luminous flux and a good light intensity are obtained for the optical film.

Claims

1. An optical film having a uniform luminous flux, comprising

a plurality of light-collecting units,

wherein said plurality of light-collecting units has a symmetrical arrangement;

wherein said plurality of light-collecting units has a first base angle and a second base angle;

wherein each of said base angles is between 35 degrees (°

) and 55°

;

wherein said light-collecting unit has a first apex angle, a second apex angle and a third apex angle;

wherein each of said first, said second and said third apex angles is between 80° and

100°

;

wherein respective vertical distances between vertices of said first, said second and said third apex angles and a base of said light-collecting unit has a ratio of 22;

21±

60%;

18; and

wherein vertices of said first, said second and said third apex angles are straightly vertical to said base of said light-collecting unit at three points to obtain a length ratio of 22;

15±

60%;

25±

60%;

18 by dividing said base of said light-collecting unit with said three points.

2. The film according to claim 1,

wherein said first interior angle is an apex angle having around vertex.

3. The film according to claim 2,

wherein said round vertex has a radius between 2 and 5 microns (μ

m).

4. The film according to claim 1,

wherein said symmetrical arrangement is extended twice.

5. The film according to claim 1,

wherein said symmetrical arrangement is extended three times.