JPH10188640A - Transparent bar light source provide on incidence end face of edge light panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent bar light source properly feeding light and easy to mass-produce by posteriorly forming an incident light guide means inversely proportional to the incident light quantity in the longitudinal direction from the incidence end face of the end, both ends, or intermediate position at the center position on the back face side of a bar member extrusion-molded with a metacrylic resin into the same cross sectional shape of a front side curve such as a solid circle or a solid semicircle. SOLUTION: An incident light guide means 13 is continuously and posteriorly formed in the longitudinal direction of a bar member 11 on the bar member 11 extrusion- molded with a methacrylic resin into the same cross shape of a front side curve such as a solid circle or a solid semicircle to form a transparent bar light source 10. The incident light guide means 13 inversely proportional to the incident light quantity is posteriorly formed in the longitudinal direction from the incidence end face 12 of one end, both ends, or intermediate position at the center position on the back face side of the bar member 11. The accuracy of the transparent bar light source 10 can be improved, it is suitable for mass production, the incident light guide means 13 effectively guides the light of the primary light source, and sufficient incident light can be fed to the incidence end face of an edge light panel 1 via a lens effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent bar light source for an edge light panel, which is provided on an incident end face of an edge light panel, which supplies the incident light to an incident end face of the edge light panel which performs the surface illumination and enables the surface illumination.

[0002]

2. Description of the Related Art An edge light panel (also referred to as a light guide plate) for performing this kind of surface illumination is used, for example, as a liquid crystal backlight mounted on a liquid crystal display device, or as a lighting signboard or a display stand. In general, a panel is made of a transparent substrate made of a transparent resin such as acrylic, and one or more end surfaces of the panel are used as an incident end surface, and a light guide pattern by halftone dots for incident light guide is printed on the back surface by post-processing, or a transparent substrate is formed. It is formed by integral molding at the time of molding, and a hot cathode or cold cathode fluorescent lamp light source is provided on the incident end face to supply incident light to the incident end face and guide the incident light by the light guide pattern. To perform the above-described surface illumination.

[0003]

In this case, the surface lighting by the edge light panel is assumed to be capable of achieving a favorable state of high brightness and high uniformity by the incident light from the fluorescent lamp light source. However, there is a problem that the fluorescent lamp light source generates heat, and the fluorescent lamp light source needs to be replaced depending on the lamp life. Although this is an improvement, it does not provide a basic solution.

[0004] When the fluorescent lamp light source generates heat, the temperature rises not only in the edge light panel but also in the liquid crystal display surface of the liquid crystal backlight and the film or panel to be illuminated such as an illumination signboard, which adversely affects these. While
Replacement due to lamp life requires disassembly of liquid crystal display devices and lighting signs, etc., and also requires installation of high places such as road signs using edge light panels. In other words, replacement work at a high place is required, which is a complicated operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a solution to the problem is that it can be used in place of a fluorescent light source having the above-mentioned problems, and is not limited to supplying incident light to an edge light panel. It is another object of the present invention to provide a transparent bar light source that is suitable for mass production of the edge light panel.

[0006]

According to the present invention, in place of the fluorescent lamp light source, the present invention is provided so as to face an incident end face of an edge light panel, and to provide a primary light from an incident end face at one end, both ends or an intermediate position in the longitudinal direction. By supplying the light source light directly or through a cable, a transparent bar light source is used to perform secondary illumination in the longitudinal direction. On the other hand, this is an acrylic resin that has particularly high transparency and excellent light transmittance. A bar material is formed by extrusion molding using methacrylic resin into the same cross-sectional shape having a front curve, and the bar material is formed with post-light incidence means, which is inversely proportional to the amount of incident light, at the center of the back surface of the bar material. By providing the incident light guide means at the center of the rear surface with the front curved, the secondary illumination light to the front side by the incident light guide means is input to the edge light panel by the lens effect. It can be supplied to the edge light panel so as to supply sufficient incident light as a light source for the edge light panel by spreading over the end face, and is suitable for mass production by extrusion molding and post-processing of the incident light guiding means. The method according to claim 1, wherein the methacrylic resin is extruded into the same cross-sectional shape having the same front side curve as a solid circle, a semi-circle, etc. A transparent bar light source for the edge light panel incident end face is provided, wherein an incident light guide means which is in inverse proportion to the amount of incident light in the longitudinal direction is formed in a post-process from the intermediate incident end face. In addition, the formation of the incident light guide means of the bar material of the methacrylic resin is precisely performed by laser processing, and the mass of the transparent bar light source is further enhanced so as to enhance the productivity. The processed and formed, and by laser processing with respect to the bar material, the incident light guiding means and by dot-shaped or fine crater line shape or the like, density is inversely proportional to its quantity of incident light,
2. The edge light panel according to claim 1, wherein the transparent bar light source is provided on the incident end face of the edge light panel, and the edge light panel is further provided with the edge light panel. Claim 3 describes that the incident light guide means is connected to the bar member in the longitudinal direction so that the supply of incident light to the bar member can be continuously or intermittently performed according to a predetermined position. 3. The transparent bar light source for the edge light panel incident end face side facing according to claim 1, wherein the transparent bar light source is formed by post-processing in a shape.
3. An edge light panel incident end face as claimed in claim 1, wherein said incident light guide means is formed with an unprocessed portion in the longitudinal direction of said bar material and is post-processed intermittently. The transparent bar light sources for installation are respectively used as the means for solving the above problems as the gist of the invention.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. In FIGS. 1 to 4, A is a surface illumination device, 1 is an edge light panel, 5 is a reflection sheet, and 6 is a reflection sheet.
Reference numeral 10 denotes a diffusion sheet, and 10 denotes a transparent bar light source for providing the incident end face 3 of the edge light panel.

In the edge light panel 1, one end face of a transparent substrate 2 is used as an incident end face 3, and a light guide pattern 4 of halftone dots density-modulated toward the non-light source side for incident light guide on the rear face of the transparent substrate 2 is formed. It is formed by post-processing by screen printing or by integral molding at the time of injection molding of the transparent substrate 2.

The transparent bar light source 10 is formed by extruding a methacrylic resin into the same cross-sectional shape having a front side curved shape such as a solid circle and a solid semicircle at one end, both ends or an intermediate position at a center position on the back side of the bar material 11. The incident light guiding means which is inversely proportional to the amount of incident light in the longitudinal direction from the end face 12 is formed by post-processing. At this time, the post-processing of the incident light guiding means 13 is performed by laser processing the bar material 11. The incident light guiding means 13 is formed by a dot-shaped or line-shaped fine crater 14, and its inverse proportion to the amount of incident light is determined by density, depth or both. Is formed by post-processing the bar material 11 continuously in the longitudinal direction of the bar material 11.

In other words, in this example, the methacrylic resin is made particularly high in purity with as few foreign substances as possible and has a specific gravity of, for example, 1.
19 (according to JIS K 7112), refractive index of 1.4
9 (according to JIS K 7105), the total light transmittance is 9
It exhibits optical properties of 3% (same), haze value of 0.5% (same), and molding shrinkage of 0.2 to 0.6% (ASTMD955).
In this example, a solid round solid bar is obtained by extrusion molding, and the center of the back side curve in the thickness direction is oblong by laser processing. The fine craters 14 forming each light guiding unit are formed by forming a dug hole in the form of dots, irregularly reflecting the incident light by forming a low concave portion, and promoting the light by a very large number to perform the light guiding very effectively. In the present embodiment, the incident light guide means is formed by post-processing the bar material 10 which is continuously engraved and scattered so as to be parallel in the thickness direction. 1
3, that is, the inverse proportion to the amount of incident light at the crater 14 forming the light guide pattern is caused by the density modulation by the pitch change in which the pitch changes from the incident end face 12 at one end toward the non-incident end face in the longitudinal direction. 1
The diffused reflection of the incident light that has entered the bar member 10 from the side 4 toward the separating direction is steplessly increased and promoted, so that the illumination light to the front side is made uniform in the longitudinal direction.

The formation of the incident light guide means by laser processing on the bar material 10 is performed, for example, by feeding the bar material 10 into a laser device, forming a large number of craters 14 in a predetermined width in the longitudinal direction by laser irradiation, and then moving the craters 14 to sequentially determine them. Crater 14 is formed in the width, and bar material 1
Laser irradiation is performed by a laser device that covers the length of the craters 14 at the same time.
May be formed.

In the figure, reference numeral 15 denotes a reflection cover which forms a back side reflection means of the transparent bar light source 10, 20 denotes a primary light source of a high-intensity lamp such as a mercury lamp, a metal halide lamp, a high-pressure sodium lamp, etc., and 21 denotes, for example, a primary light source. Using the surface lighting device A such as a road sign, the surface lighting device A
An optical cable in which a flexible pipe filled with, for example, a sol-like transparent silicon having a high light transmittance so that incident light of a primary light source 20 installed at a low position is supplied to an incident end face 12 of a transparent bar light source 10 from a separated position. , 22 is an adapter for connecting the transparent bar light source 10 provided at one end of the optical cable 21, and 23 is a lamp socket of the primary light source 20 provided at the other end of the optical cable 21.

FIG. 5 shows another example. At this time, the transparent bar light source 10 heats and bends the bar material 11 at a predetermined position after extrusion molding or laser processing, and adjusts the bar material 11 to, for example, a temporarily stopped road sign. The edge light panel 1 also has a triangular shape (in this case, a halftone dot), which is further bent into a plane triangular shape, and is further formed into a recess by mechanically post-processing the circular hole at the intermediate position in the longitudinal direction in this example. The light guide pattern 4 is density-modulated from the outer peripheral side toward the central part) to form a triangular surface illuminating device A by surrounding the outer peripheral incident end face. The incident light guide means 12 by the same laser processing in the light source 10 is connected to the bar material 11.
In the present example, the incident light guide means 13 is provided at each of the left and right bent portions in the triangular shape with a non-processed portion 15 in the longitudinal direction. A non-processed portion 16 is formed as a non-formed portion. The non-processed portion 16 is provided so as to be in inverse proportion to the amount of incident light in each longitudinal direction from both sides of the incident end face 12. The adapter receiver 24 is installed by the above method, and the rest is basically the same as the above example, so that the incident light is not consumed at each corner portion of the edge light panel 1 and each straight line is formed. Illumination light can be suitably supplied to the edge light panel 1 at the incident end face 3.

FIGS. 6 to 8 show examples of the cross-sectional shape of the bar material 11 in the transparent bar light source 10. FIG. 6 shows a solid semicircular shape, which is extruded into the same cross-sectional shape with a curved front side. For example, FIG. 7 shows a solid one-sided curved square or rectangular shape.
FIG. 8 shows an example of extrusion molding to the same cross-sectional shape of the front side curve, and FIG. 8 shows an example of extrusion molding to the same cross-sectional shape of the front side curve as a solid one-sided trapezoidal shape. The side is used so as to face the incident end face 3 of the edge light panel 1.

Although the illustrated example is as described above, according to the present invention, the bar member formed by extruding the incident light guide means has one or more dots, stripes,
The incident light guide means density-modulated by cross lines or the like shall be printed by, for example, screen printing, and shall be formed by mechanical processing. The post-processing of the incident light guide means shall be performed by laser processing on the bar material. In this case, the inverse proportion to the incident light quantity of the incident light guiding means shall be based on the density of the density modulation due to the crater area change and the depth of the irregular reflection amount modulation due to the crater depth change, in addition to the density modulation due to the pitch change. Or a combination of the two, when the incident light guide means is post-processed intermittently with a non-processed portion in the longitudinal direction of the bar material, for example, a plurality of sections formed in the edge light panel Incoming light guide means are formed for each of the backlighting parts, and An unprocessed portion shall be provided, with both ends of the bar material being the incident end faces of the primary light source, and the incident light guide means being directed in a direction from the middle position to the center position in the longitudinal direction of the bar material, in inverse proportion to the amount of incident light. Including a primary light source at the entrance end face of the bar material to directly supply incident light, including, for example, a surface illumination device other than the above road sign, for example, for a liquid crystal backlight. Therefore, the specific shapes and structures of the bar material of the present invention, the incident end face, the incident light guiding means, the fine crater by laser processing, the means inversely proportional to the incident light amount, the relationship between them, and the specific forms of addition to these Can be varied and need not be limited to those illustrated and described above.

[0016]

The present invention is configured as described above.
According to a first aspect of the present invention, the methacrylic resin having excellent light transmittance is extruded into the same cross-sectional shape with a front curve, and the incident light guiding means is post-processed and formed at a central position on the rear side, so that the accuracy is high. In addition to being suitable for mass production, the incident light guide means effectively guides the light source light of the primary light source and supplies sufficient incident light to the incident end face of the edge light panel by a lens effect, so that the incident light is transmitted to the edge light panel. It is possible to provide a transparent bar light source for the edge face of the edge light panel incident end face which can be used in place of the fluorescent light source for secondary illumination suitable for supply. By performing the formation by laser processing,
In addition to the above, the formation of the incident light guiding means can be performed precisely and the mass productivity can be further enhanced. In addition to the above, the form of supply of incident light to the edge light panel can be made continuously or intermittently according to a predetermined position. In accordance with the illumination, the incident light can be suitably supplied.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a surface lighting device showing a relationship between an edge light panel and a transparent bar light source.

FIG. 2 is a front view showing a relationship between an edge light panel and a transparent bar light source.

FIG. 3 is an enlarged perspective view of a transparent bar light source.

FIG. 4 is an enlarged plan view of the incident light guiding means.

FIG. 5 is a front view showing the relationship between another example edge light panel and a transparent bar light source.

FIG. 6 is an enlarged longitudinal sectional view of another example of a transparent bar light source.

FIG. 7 is an enlarged vertical sectional view of a transparent bar light source of still another example.

FIG. 8 is an enlarged longitudinal sectional view of a transparent bar light source of still another example.

[Explanation of symbols]

 A-side lighting device 1 Edge light panel 10 Transparent bar light source 11 Bar material 12 Incident end face 13 Incident light guiding means 14 Crater

Claims (4)

[Claims] 1. A bar material formed by extruding a methacrylic resin into the same cross-sectional shape having a front side curved shape such as a solid circle or a solid semicircle at one end, both ends, or in the longitudinal direction from the incident end face at one end, both ends or an intermediate position. A transparent bar light source for an edge face of an edge light panel, wherein an incident light guiding means in inverse proportion to an incident light amount is formed by post-processing. 2. The post-processing of the incident light guiding means is performed by laser processing on the bar material, and the incident light guiding means is formed by a fine crater such as a dot or a line, and is inversely proportional to the amount of incident light. 2. The transparent bar light source as claimed in claim 1, wherein the step (b) is performed depending on the density, the depth, or both. 3. The transparent surface of the edge light panel according to claim 1, wherein the incident light guide means is formed by post-processing continuously in the longitudinal direction of the bar member. Bar light source. 4. The edge light panel according to claim 1, wherein said incident light guide means is formed with a non-processed portion in a longitudinal direction of said bar material and is post-processed in an intermittent manner. Transparent bar light source for the incident end face.