KR20100022661A - Optical film having uniform luminous flux - Google Patents

Abstract

PURPOSE: An optical film with uniform luminous flux is provided to uniformize a luminous flux by using internal angles which have various sizes in the structure of a light collecting unit. CONSTITUTION: An optical film comprises a plurality of light collecting units(1,1a). A plurality of light collecting units have a symmetrical structure. The angle of a first and a second bottom side of a plurality of light collecting units is 35 degrees or 55 degrees. A first, a second, and a third vertex angle of the light collecting unit are 80 degrees or 100 degrees. A vertical distance between the apex of a first, a second, a third vertex angle, and the bottom side of the light collecting unit has a regular ratio.

Description

Optical film with uniform luminous flux {OPTICAL FILM HAVING UNIFORM LUMINOUS FLUX}

The present invention relates to an optical film; In particular it relates to an optical film for obtaining a uniform luminous flux having internal angles of varying degrees in the structure of a light-collecting unit having a symmetrical arrangement after passing through a light source. .

As shown in Fig. 15, the first general optical film 2f has a symmetrical structure, wherein the vertex angle is 90 degrees and the pitch is 50 micrometers. As shown in Fig. 16, after the light source passes through the first general optical film 2f, a good luminous flux is obtained at the center of 0 ° while a poor luminous flux is obtained between -30 ° and + 30 °.

As shown in Fig. 17, the second general optical film 2g has a non-symmetrical structure, and the base angles of such optical films are 55 ° and 35 °, respectively. As shown in Fig. 18, after the light source passes through the second general optical film 2g, the luminous flux is inclined to the side having an asymmetric luminous flux between -30 ° and + 30 °.

As shown in FIG. 19, the third general optical film 2h has a symmetrical structure, where the base angles are 55 ° and 35 °, respectively. As shown in Fig. 20, after the light source passes through the third general optical film 2h, a good luminous flux is obtained at the center of 0 ° while a luminous flux with a large deviation is obtained between -30 ° and + 30 °. .

When a light source passes through the ordinary optical films; The luminous flux becomes uneven between the center and -30 ° to + 30 °. As such, the prior arts do not meet the practical usage needs of all users.

It is an object of the present invention to obtain a uniform luminous flux using internal angles of varying degrees in the structure of the light-collecting unit after passing through the light source.

In order to achieve the above object, the present invention provides an optical film having a uniform luminous flux, the optical film comprising a plurality of light-collecting units, the plurality of light-collecting units having a symmetrical configuration; The plurality of light-collecting units have a first base angle and a second base angle; Each base angle is between 35 degrees and 55 degrees; The light-collecting unit has a first vertex angle, a second vertex angle, and a third vertex angle; Each of the first, second, and third vertex angles is between 80 ° and 100 °; Each vertical distance between the vertices of the first, second, and third vertex angles and the base of the light-collecting unit has a ratio of 22: 21 ± 60%: 18; The vertices of the first, second, and third vertex angles at three points are perpendicularly perpendicular to the base of the light-collecting unit and divide the base of the light-collecting unit by the three points 22: 15 ± 60. A length ratio of%: 25 ± 60%: 18 is obtained; Thus, a uniform luminous flux is obtained through the light-collecting unit at the center of 0 ° and between + 30 ° and −30 °.

Thus, a novel optical film of uniform luminous flux is obtained.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be better understood from the following description with reference to the accompanying drawings, in accordance with a preferred embodiment of the present invention.

Hereinafter, preferred embodiments will be described to understand the features and structures of the present invention.

1 and 3 are perspective views showing a preferred embodiment according to the present invention and cross-sectional views showing a onefold set of symmetrical optical films, a doubled set of symmetrical optical films and a triplet set of symmetrical optical films See 2A-2C. As shown in these figures, the present invention relates to an optical film having a uniform luminous flux, the optical film comprising a plurality of light-collecting units 1, 1a, and the plurality of light-collecting units 1 , 1a) has a symmetrical configuration; All the light-collecting units 1, 1a have a first vertex angle 11, a second vertex angle 12 and a third vertex angle 13; Each of the first, second, and third vertex angles 11, 12, 13 is between 80 degrees (°) and 100 degrees, and the first vertex angle (11) has rounded vertices, wherein the rounded vertices are from 2 to Has a radius of 5 microns (μm); The plurality of light-collecting units 1, 1a have a first base angle 14 and a second base angle 15, wherein each of the first and second base angles 14, 15 is from 35 ° to. 55 ° and each vertical distance between the vertices of the first, second, and third vertex angles 11, 12, 13 and the base of the light-collecting unit 1, 1a is 22: 21 ± 60% It has a ratio of 18, so that the vertices of the first, second and third vertex angles 11, 12, 13 are lighted at three points that are linearly perpendicular to the base of the light-collecting unit 1, 1a. By dividing the base of the collecting unit, a length ratio of 22: 15 ± 60%: 25 ± 60%: 18 is obtained. In addition, the symmetrical configuration of the light-collecting units 1, 1a can be expanded in doubles as shown in FIG. 2B or in multiples of 3 as shown in FIG. 2C, and can be expanded in multiples of more than 3 times. will be. As a result, a novel optical film having a uniform luminous flux is obtained.

Reference is made to FIGS. 3 and 4, which are graphs showing the light intensity curves of a multiple of a set of symmetrical optical films and a multiple of a set of symmetrical optical films. As shown in these figures, in the use of the present invention, the light source passes through the light-collecting unit. After the light source passes through the light-collecting unit, through the angular ratios of the first, second, and third vertex angles and the vertices of the first, second, third vertex angles are linear to the base of the light-collecting unit. Through the length ratio of the base of the light-collecting unit obtained by dividing the base of the light-collecting unit into three perpendicular points, a uniform luminous flux is obtained at the center of 0 ° and between + 30 ° and -30 °. When both the first and second base angles are 45 °, the luminous flux at the center of 0 ° and between + 30 ° and −30 ° is good and uniform. Comparing the light intensity curve 41 of the present invention with the light intensity curve 42 of the general optical film, it can be confirmed that the present invention has better quality and performance.

A diagram showing a first optical film and a light intensity curve of the film; A diagram showing a second optical film and a light intensity curve of the film; A diagram showing a third optical film and a light intensity curve of the film; A diagram showing a fourth optical film and a light intensity curve of the film; Reference is made to FIGS. 5 to 14 which show a fifth optical film and a light intensity curve of the film. As shown in these figures, by changing the angular magnitudes of the first and second base angles, the following effects are obtained.

Example (A)-As shown in FIG. 5, the first optical film 2a is disposed symmetrically, and the first bottom angle and the second bottom angle of the first optical film 2a are respectively 35 ° and 55 °. As shown in Fig. 6, after the light source passes through the first optical film 2a, the sinking of the light intensity curve is observed at the center of 0 ° and the effect of the light beam is not perfect.

Example (B)-As shown in FIG. 7, the second optical film 2b is disposed symmetrically, and the first bottom angle and the second bottom angle of the second optical film 2b are 40 ° and 50 °. As shown in Fig. 8, after the light source passes through the second optical film 2b, the drop of the light intensity curve is observed at 0 °, so the effect of the light beam is not perfect; Such a drop is larger than that in Example (A).

Example (C)-As shown in FIG. 9, the third optical film 2c is disposed symmetrically, and the first bottom angle and the second bottom angle of the third optical film 2c are respectively 50 ° and 40 °. As shown in FIG. 10, after the light source passes through the third optical film 2c, the section of the light intensity curve is gentle and good at 0 ° and between + 30 ° and −30 °. Have uniformity. However, the luminous flux intensity at the center of 0 ° is not as good as the luminous flux intensity in Example (B).

Example (D)-As shown in FIG. 11, the fourth optical film 2d is disposed symmetrically, and the first base angle and the second base angle of the fourth optical film 2d are 55 ° and 35 °. As shown in Fig. 12, after the light source passes through the fourth optical film 2d, the light intensity has a small deviation between 0 ° and + 30 ° to -30 °, and has a good luminous flux at the center of 0 °. Is obtained.

Example (E)-As shown in FIG. 13, the fifth optical film 2e is disposed non-symmetrically, and the first bottom angle and the second bottom angle of the fifth optical film 2e are 55 °, respectively. And 35 °. As shown in Fig. 14, after the light source passes through the fifth optical film 2e, a good luminous flux is obtained at the center of 0 °, but light intensity at the center of 0 ° and between + 30 ° and -30 ° The uniformity of is not perfect.

Accordingly, the present invention has the following advantages:

1. The present invention utilizes a symmetrical structure to obtain uniform light intensity at the center and between + 30 ° and -30 °, which can be extended to double, triple or even more. . However, because the expansion of more drainage provides a poorer optical vision, a symmetrical structure of less than 2 times is a more desirable choice.

2. The largest vertex angle of the present invention has rounded vertices to prevent scratch damage during assembly.

3. In many light-gathering units, the distance between their vertex angle and the base line is not equal, which is to reduce the optical interference in a regular array, and the Morie 'effect after assembly Resolved.

4. Since excessive static electricity may remain in the manufacture of the optical film, in order to solve the wet-out problem involving bad yield due to residual static electricity, Vertices have different heights.

In summary, the present invention provides an optical film with a uniform luminous flux, and after passage of the light source, a uniform luminous flux is obtained using internal angles having various sizes in the structure of the light-collecting unit.

The preferred embodiments described above are not intended to unnecessarily limit the scope of the invention. Accordingly, all variations or modifications equivalent to the scope of the disclosure and claims of the present application will be included in the scope of the present invention.

1 is a perspective view showing a preferred embodiment according to the present invention.

2A-2C are cross-sectional views illustrating one-fold, double-, and triple-fold sets of symmetrical optical films.

3 and 4 are graphs showing light intensity curves of one- and two-fold sets of symmetrical optical films.

5 and 6 are diagrams showing a light intensity curve of the first optical film and the film.

7 and 8 are diagrams showing a light intensity curve of the second optical film and the film.

9 and 10 illustrate a third optical film and a light intensity curve of the film.

11 and 12 illustrate a fourth optical film and a light intensity curve of the film.

13 and 14 are diagrams showing a light intensity curve of the fifth optical film and the film.

15 and 16 show light intensity curves of the first prior art and films thereof.

17 and 18 show light intensity curves of the second prior art and films thereof.

19 and 20 show the light intensity curves of the third prior art and films thereof.

Claims (5)

As an optical film having a uniform luminous flux, Includes a plurality of light-collecting units, The plurality of light-collecting units have a symmetrical configuration; The plurality of light-collecting units have a first base angle and a second base angle; Each base angle is between 35 degrees and 55 degrees; The light-collecting unit has a first vertex angle, a second vertex angle, and a third vertex angle; Each of the first, second, and third vertex angles is between 80 ° and 100 °; Each vertical distance between vertices of the first, second, and third vertex angles and the base of the light-collecting unit has a ratio of 22: 21 ± 60%: 18; And The vertices of the first, second and third vertex angles at three points are perpendicularly perpendicular to the base of the light-collecting unit, and the base of the light-collecting unit is divided by three to 22: 15 ± 60%. A length ratio of: 25 ± 60%: 18 is obtained Optical film of uniform luminous flux. The method of claim 1, The first internal angle is a vertex angle with rounded vertices Optical film of uniform luminous flux. The method of claim 2, The rounded vertex has a radius of 2 to 5 microns (μm) Optical film of uniform luminous flux. The method of claim 1, The symmetrical configuration is doubled Optical film of uniform luminous flux. The method of claim 1, The symmetrical configuration is extended by three times Optical film of uniform luminous flux.

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