JP3084161U - Planar lighting device - Google Patents

Abstract

(57) [Problem] To provide a spread illuminating apparatus capable of concentrating light rays reflected to a light plate and eliminating shortage of light rays transmitted to a liquid crystal display curtain. SOLUTION: A reflection surface 11 of a light rod 1 has a large number of reflection grooves. Each reflecting groove is divided into a first surface 141 and a second surface 142 corresponding to the first spot light source 101 and the second spot light source 102 at both ends of the light rod 1, respectively.
1, the sandwiching angle between the second surface 142 and the reflecting surface 11 is 40 degrees to 86 degrees. The angles and interval distributions of the reflecting grooves are symmetrical about the center point of the light rod 1, and the light beams of the first spot light source 101 and the second spot light source 102 are intensively reflected on the light plate 2. The light groove 22 provided on the top surface 21 of the light plate 2 has a third surface 221 and a fourth surface 222, respectively, and the angle between the third surface 221 and the fourth surface 222 and the top surface 21 is 47 degrees. Since the angle is from 86 degrees to 86 degrees, the light rays are concentrated and guided to the liquid crystal display curtain on average, thereby improving brightness and averageness.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a planar lighting device.

[0002]

[Prior art]

 As shown in FIG. 5, in a kind of conventional planar lighting device, a spot light source 81 is provided at one end of a light rod 8. The light rod 8 has a reflecting surface 82 and a light emitting surface 83, and the reflecting surface 82 is provided with a number of reflecting portions 821 at intervals. The reflecting portion 821 has a saw-tooth shape, diffuses and reflects the light emitted from the spot light source 81, transmits the light to the light plate 84, and reflects the light from the light plate 84 to a liquid crystal display curtain (not shown in the drawing).

As shown in FIG. 6, as another form of the conventional planar lighting device, a spot light source 91 is provided at one end of a light rod 9. The light rod 9 has a reflecting surface 92 and a light emitting surface 93. The reflecting surface 92 is provided with a large number of V-shaped reflecting grooves 94 at predetermined intervals, and a reflecting slope 941 forming each reflecting groove 94 is formed by a spot light source 81. The light emitted from the light source is reflected and exits from the light exit surface 93, and is transmitted to the light-emitting plate 95, and then reflected from the light-emitting plate 95 to the liquid crystal display curtain (not shown in the drawing).

[0004]

[Problems to be solved by the invention]

 However, the above-described conventional planar illumination device has the following disadvantages. (1) The reflecting section 821 diffuses and reflects the light beam to the light plate 84, so that the purpose of averaging the light beam can be achieved. However, the diffuse reflection method cannot concentrate the light beam, and Since the light beam having a large amount may diverge out of the range of the light plate 84, the light beam reflected to the light plate 84 is weakened, and the light beam transmitted to the liquid crystal display screen is insufficient.

(2) Since the reflection grooves 94 on the reflection surface 92 have a V-shape and are arranged with a regularity, it is possible to average the light of the spot light source 81 and reflect the light to the light plate 95. However, since the angles of the respective reflecting slopes 941 are all the same, and the distances between the respective reflecting grooves 94 and the spot light sources 91 are different, the incident angles of the light rays are all different with respect to the respective reflecting slopes 941 and pass through the reflecting slopes 941. Therefore, the light rays reflected to the light plate 95 cannot be concentrated. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spread illuminating apparatus capable of concentrating light rays reflected to a light plate and eliminating shortage of light rays transmitted to a liquid crystal display curtain.

[0006]

[Means for Solving the Problems]

 To achieve the above object, a spread illuminating apparatus according to claim 1 of the present invention includes a light source set and a light plate. The light source set has a light rod, and a first spot light source and a second spot light source are provided at both ends of the light rod, respectively. The light rod has a reflecting surface and a light emitting surface on both sides, respectively. On the side, an arc-shaped reflection mask is provided coaxially with the light rod. The reflecting surface has a plurality of substantially V-shaped reflecting grooves, and the surface forming the reflecting grooves is divided into a first surface corresponding to the first spot light source and a second surface corresponding to the second spot light source. An angle between the first surface or the second surface and the reflection surface is 40 degrees to 86 degrees, and an angle and a distance distribution between the first surface and the second surface are set at the center of the light rod. Is a symmetrical form.

The light plate is adjacent to the light exit surface of the light rod and has a plurality of substantially V-shaped light grooves on the top surface. The surface forming the light groove is divided into a third surface and a fourth surface, and an angle between the third surface or the fourth surface and a top surface of the light plate is 47 degrees to 86 degrees. In the spread illuminating device according to the second aspect of the present invention, the distance between the respective reflection grooves provided on the reflection surface of the light rod is 0.05 mm to 0.3 mm. In the spread illuminating apparatus according to the third aspect of the present invention, the distance between each light groove of the light plate is set to be equal to 0. It is 2 mm to 0.3 mm.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1, 2, 3, and 4, the planar lighting device according to the embodiment of the present invention includes a light source set 10 and a light plate 2. The light source set 10 includes a light rod 1 having a reflecting surface 11 and a light emitting surface 12 formed on both sides, respectively, and a first spot light source 101 and a second spot light source 102 are provided at both ends of the light rod 1, respectively. ing . On the reflection surface 11 side, there is provided a reflection mask 13 coaxial with the light rod 1 and formed in an arc shape. The reflecting surface 11 is provided with a large number of reflecting grooves 14 formed in a substantially V shape, and the surfaces forming the reflecting grooves 14 correspond to the first surface 141 corresponding to the first spot light source 101 and the second spot light source 102. It is distinguished from the second surface 142, and the sandwiching angle θ1 and the sandwiching angle θ2 between the first surface 141 and the second surface 142 and the reflecting surface 14 are from 40 degrees to 86 degrees. The shape of the angle and interval distribution between the first surface 141 and the second surface 142 is symmetric about the center line A of the light rod 1 as a center point. The distance B between the reflection grooves 14 is 0.05 mm to 0.3 mm.

The light plate 2 is adjacent to the light emitting surface 12 of the light rod 1, and has a number of light grooves 22 formed on the top surface thereof in a substantially V-shape. The surfaces forming the light grooves 22 are each classified into a third surface and a fourth surface, and the angle between the third surface 221 and the fourth surface 222 and the top surface is 47 degrees to 86 degrees. The spacing distance C between the light grooves 22 is 0.2 mm to 0.3 mm.

As shown in FIG. 3, a first surface 141 corresponding to the first spot light source 101 and a second surface 142 corresponding to the second spot light source 102 of each reflection groove 14 of the light rod 1 are distinguished. , The sandwiching angle θ1 and the sandwiching angle θ2 are 40 degrees to 86 degrees. The sandwiching angle θ1 and the sandwiching angle θ2 between the first surface 141, the second surface 142, and the reflecting surface 11 become larger as approaching the first spot light source 101 and the second spot light source 102. Since the angle θ1, the angle θ2 and the distance distribution between the first surface 141 and the second surface 142 of each reflection groove 14 are symmetrical about the center line A of the light rod 1, the first spot is formed. Light rays emitted from the light source 101 and the second spot light source 102 are reflected through the first surface 141 and the second surface 142 of the reflection groove 14 and reflected from the light exit surface 12 to the light plate 2 at an angle approaching 0 degree. Then, since the light is intensively emitted from the light exit surface 12 to the light plate 2, few light beams escape from the light plate 2, and the light rod 1 can efficiently transmit the light beam to the light plate 2.

As shown in FIG. 4, a large number of light grooves 22 on the top surface 21 of the light plate 2 exhibit an interval distribution, and a pinch angle between the third surface 221 and the fourth surface 222 of the light groove 22 and the top surface 21. Is from 47 degrees to 86 degrees, the light rays concentrated on the light rod 1 and reflected to the light plate 2 are averagely and intensively guided to the liquid crystal display curtain by the reflection of the third surface 221 and the fourth surface 222, and significantly. Brightness and averageness are improved.

[0012]

[Effect of the invention]

 The present invention has a large number of reflection grooves on the reflection surface of the light rod, and each reflection groove is distinguished into a first surface and a second surface corresponding to the spot light sources at both ends of the light rod, respectively. The sandwiching angle between the surface and the reflecting surface is from 40 degrees to 86 degrees, and the angles and interval distribution of the first surface and the second surface are symmetrical about the center point of the light rod. The light rays from the spot light sources at both ends of the light rod are intensively reflected to the light plate. A number of light grooves on the top surface of the light plate each have a third surface and a fourth surface, and the sandwich angle between the third surface, the fourth surface, and the top surface is 47 to 86 degrees, It is possible to achieve the effect of improving brightness and averageness by concentrating light rays and guiding them to the liquid crystal display screen on average.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a planar lighting device according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating the spread illuminating apparatus according to the embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating light reflection by a reflection groove of a light rod according to an embodiment of the present invention;

FIG. 4 is a schematic view showing light reflection by a reflection groove of a light plate according to an embodiment of the present invention;

FIG. 5 is a schematic diagram showing a kind of conventional planar lighting device.

FIG. 6 is a schematic view showing another conventional planar lighting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light rod 2 Light plate 10 Light source set 11 Reflection surface 12 Light emission surface 13 Reflection mask 14 Reflection groove 21 Top surface 22 Light emission groove 101 First spot light source 102 Second spot light source 141 First surface 142 Second surface 221 Third surface 222 Fourth side

Claims (3)

[Utility model registration claims] 1. A spread illuminating device comprising a light source set and a light plate, wherein the light source set has a light rod, and a first spot light source and a second spot light source at both ends of the light rod, respectively. The light rod has a reflection surface and a light emission surface on both sides, respectively. An arc-shaped reflection mask is provided coaxially with the light rod on one side of the reflection surface, and the reflection surface is substantially V Having a plurality of reflection grooves of a mold, a surface forming the reflection grooves is divided into a first surface corresponding to the first spot light source and a second surface corresponding to the second spot light source, and the first surface Alternatively, the sandwiching angle between the second surface and the reflecting surface is from 40 degrees to 86 degrees, and the angle and interval distribution of the first surface and the second surface are symmetrical with respect to the light rod as a center point. The light plate is adjacent to the light exit surface of the light rod, The surface has a plurality of substantially V-shaped light grooves, and the surface forming the light grooves is divided into a third surface and a fourth surface, and the third surface or the fourth surface and a top of the light plate are provided. A planar lighting device characterized in that a sandwich angle with a surface is 47 degrees to 86 degrees. 2. An interval distance between each of the reflection grooves provided on the reflection surface of the light rod is 0.05 mm to 0.3 mm.
The planar lighting device according to claim 1, wherein: 3. The spread illuminating apparatus according to claim 1, wherein an interval distance between each light groove of the light plate is 0.2 mm to 0.3 mm.