JP3328669B2 - Edge light lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge light illuminating device used for a liquid crystal backlight, a signboard, an illuminating body and the like.

[0002]

2. Description of the Related Art Generally, an edge light illuminating device of this kind is
For example, one side or both ends of a single transparent resin edge light panel made of acrylic or the like is used as an incident end face in accordance with an illumination surface having a back surface provided with irregular reflection means using a halftone dot pattern, and fluorescent light for supplying incident light to this incident end face. A primary light source such as a lamp or a cold-cathode tube is provided on the incident end face, and the primary light source is generally provided with a reflection means on the non-incident end face side to supply incident light to the incident end face as much as possible. It has been.

[0003]

However, in this case, the incident light is emitted through the gap between the primary light source and the incident end face, and then re-enters. Some will be reflected. The reflection by the incident end face varies depending on other factors such as the relationship with the primary light source, but is considerably large in the amount of light from the primary light source.

[0004] The reflected incident light can reach the incident end face again by the reflecting means of the primary means, but it is difficult to avoid being depleted by repeated reflection.

[0005] As described above, between the primary light source and the edge light panel, an incident loss occurs that the edge light panel cannot sufficiently capture the incident light from the primary light source due to the reflection action of the incident end face. Will be.

Further, when a large-sized edge light panel is required, for example, as a sign for a station building or a signboard for a highway,
If a plurality of edge light panels are used in place of the single one corresponding to the lighting surface and connected in the middle to match the lighting surface, the reflection action of the connection end face on the connection side also causes
The connection site causes abnormal light emission, and therefore, it is difficult to use a plurality of edge light panels so as to separately connect the illumination surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to suppress incident light from a primary light source by suppressing reflection on an incident end face or a connection end face. An edge light illuminating device capable of transmitting and supplying as much as possible to the inside of a panel is provided. Second, an edge light illuminating device capable of eliminating abnormal light emission at a connection portion and enabling connection use of a plurality of edge light panels is provided. It is in.

[0008]

Means for Solving the Problems According to the present invention, the present invention is directed to a case where a bridge-shaped incident light transmission path is provided between the incident end face of the edge light panel and the primary light source so as to be in close contact with the primary light source, or When a bridge-shaped incident light transmission path is also provided between the connection end faces of the edge light panel so as to be in close contact with them, the reflection action of the incidence end face or the opposing connection end face is suppressed, and the light from the primary light source enters the incidence end face. It has been found that loss can be prevented as much as possible, and abnormal light emission at the connection part can be prevented as much as possible. In this case, the bridge-like incident light transmission path is made of, for example, gel-like transparent silicon or gel-like transparent acrylic. Focusing on the self-adhesiveness of the gel-like transparent material, the surface of the incident end face and the surface of both the primary light source or the face of the opposite connection end face are formed by the self-adhesiveness. By adhering to the adhesive state of the familiar interview with the surface, it is possible to ensure that both surfaces adhere to each other without leaving a gap, and to prevent vibrations that may be received by the edge light lighting device. Without causing peeling and hindering these adhesions, the gel-like transparent material ensures the vibration resistance and always maintains the adhesion by the familiar interview,
The invention according to claim 1, which has been obtained based on the knowledge that it is possible to stably secure the above-mentioned suppression of the reflection effect, prevention of the incident loss, and prevention of the abnormal light emission over a long period of time. A bridge-shaped incident light transmission path formed of a heat-resistant gel-like transparent material closely adhered to the edge light panel is provided between the incident end face of the edge light panel and the primary light source provided on the incident end face. 3. An edge light illuminating device characterized in that adhesion to a light source is performed by applying self-adhesion of the gel-like transparent substance to both surfaces so that the surface is in an adhesive state. A bridge-shaped incident light transmission path formed of a heat-resistant, gel-like transparent material that is in close contact with the panel is interposed between the opposing connection end faces of the panel, and the adhesion to the opposing connection end face is defined by the above-mentioned gel. An edge light illuminating device characterized in that both surfaces are made to adhere to each other due to the self-adhesiveness of the bright substance, and the invention according to claim 3 is characterized in that the gel transparent substance is a gel transparent substance. 3. The edge light illuminating device according to claim 1 or 2, wherein the gel-like transparent substance is made of gel-like transparent silicon, since silicon is preferable. This is a means of solving the problem.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the drawings showing the embodiments. In FIGS. 1 and 2, A is a liquid crystal backlight, 1 is an edge light panel, and 10 is a primary light source.

The edge light panel 1 is made of a thin acrylic transparent resin having a thickness of 2 mm, and is formed on the rear surface of the transparent substrate 2 by two-clean printing or by integral molding with the transparent substrate 2 by irregular reflection means 3 of a halftone dot pattern. In addition, in the present example, the irregular reflection means 3 of the halftone dot pattern has a halftone dot in a direction away from the incident end face 4 in an in-plane direction. This is for a one-sided light source whose area is gradually increased so as to be maximum at an intermediate position on the reflection end face 5 side from the center.

The primary light source 10 is provided with an aperture tube provided with a transparent aperture 11 capable of increasing the incident light by about 30% as compared with a general one by making a part of the glass tube transparent in the form of a slit and imparting light directionality. The primary light source 10 has the transparent aperture 11 facing the incident end face 4 of the edge light panel 1 so as to be close to the incident end face 4.

At this time, between the incident end face 4 of the edge light panel 1 and the primary light source 10, a bridge-shaped incident light transmission path 20 formed of a heat-resistant gel-like transparent material that is in close contact with them is provided, and the incident end face thereof is provided. 4 and primary light source 1
The surface of the gel-like transparent substance is adhered to both surfaces by the self-adhesion of the gel-like transparent substance, so that the bridge-like incident light transmission path 20 allows the incident light from the primary light source 10 to pass. The light is transmitted to the edge light panel 1 as much as possible.

In this embodiment, the gel-like transparent silicon forming the bridge-like incident light transmission path 20 is generally made of a vibration-proof material,
For example, silicon having a product name of “α GEL” manufactured by Siegel Co., Ltd., which is used as a soundproofing material or the like, is used vertically on the incident end face 4 side of the edge light panel 1 and on the primary light source 10 side. Has a substantially trapezoidal cross section in a curved concave shape so as to follow the transparent aperture 11 and is processed into a long rod shape over the entire length of the incident end face 4.

The gel-like transparent silicon is made colorless and transparent, having a light transmittance of 95% or more, 97 to 98%, and a refractive index of 1.
404, is a gel-like transparent substance having a self-adhesive property on its surface at a normal temperature of −50 to 200 ° C.

Since this gel-like transparent silicon has the above-mentioned adhesiveness, its self-adhesiveness causes the vertical side to the incident end face 4 of the edge light panel 1 and the curved concave side to the primary light source 10. Each of them is brought into close contact with each other so as to be in direct contact with each other, and a bridge-shaped incident light transmission path 20 of each single substance is formed integrally between them.

Further, in the liquid crystal backlight A,
The edge light panel 1 is used so that light emitted from a tube wall other than the transparent aperture 11 of the primary light source 10 is also used as incident light and emission loss of the incident light is prevented as much as possible.
The primary light source 10 and the gel-like transparent silicon 20 are hermetically covered with a sealed reflective cover 12 having a substantially U-shaped cross-section so as to reach the front and back edges on the side of the incident end face 4 of FIG. is there.

In the drawing, reference numeral 30 denotes a diffusion sheet made of a white polyester resin, and reference numeral 31 denotes a reflection sheet made of a low-foamed white polyester resin in which the reflectance is increased by low foaming.

In the liquid crystal backlight A of this embodiment, the bridge-shaped incident light transmission path 2 made of the gel transparent silicon is used.
By using 0, the light transmittance between the edge light panel 1 and the primary light source 10 is high, and the edge light panel 1 and the primary light source 10 are in close contact with each other without forming a gap, and are not affected by the heat generated by the primary light source 10. The bridge-shaped incident light transmission path 20 having heat resistance itself can be formed. Therefore, the reflection effect of the incident end face 4 of the edge light panel 1 is suppressed, and the incident light of the primary light source 10 is captured without incident loss. By effectively transmitting and supplying the light to the inside of the edge light panel 1, the illumination brightness of the edge light panel 1 is improved by about 10 to 30%.

FIG. 3 shows a liquid crystal backlight A according to another example. The liquid crystal backlight A of this example has a primary light source 1 on both sides.
This is an example in which the lighting unit has 0 and serves as a lighting unit.

That is, in the edge light panel 1, the opposite end faces on which the primary light sources 10 are similarly provided are the incident end faces 4, and the halftone dot area is gradually increased in the in-plane separation direction from each of the incident end faces 4 (not shown) on the back surface. In addition, it is provided with irregular reflection means of a halftone dot pattern for both side light sources which is maximized at the center portion, and between each incident end face 4 of the edge light panel 1 and the primary light source 10 as described above. Bridge-like incident light transmission path 20 made of the gel-like transparent silicon
Is also interposed in close contact with the both surfaces by the self-adhesiveness of the adhesive state of the interview.

At this time, the liquid crystal backlight A uses a sealed reflection case 13 extending from the back surface of the edge light panel 1 to the outer peripheral edge of the front surface so as to form the above-mentioned lighting unit. Each of the bridge-shaped incident light transmission paths 20 is covered in a sealed manner.

FIG. 4 shows still another example. In the figure, B denotes a large-size backlight for illuminating a large-size display panel such as a station building signboard or an expressway information board. Plate backlight B is a primary light source 1 with fluorescent lamps on both sides.
0, and a plurality of edge light panels 1 divided into a plurality in the width direction intersecting with the primary light source 10 are connected and used in the middle in the width direction.

At this time, the edge light panel 1 has both ends on the side where the primary light source 10 is provided as the incident end faces 4, and the end face of the connection portion as the connection end face 6.
In this example, the halftone dot area is gradually increased in the in-plane separation direction, and the halftone dot pattern is provided with a diffuse reflection means having a maximum at the center portion. Similarly, a bridge-shaped incident light transmission path 20 formed of a heat-resistant gel-like transparent material that is in close contact with each other is interposed between the connection end faces 6 of the portion, and the close contact with the opposing connection end face 6 is determined by the gel-like transparent face. Due to the self-adhesiveness of the substance, both surfaces are made to be in an adhered state in which the surfaces are in contact with each other, so that the incident light traveling inside the edge light panel 1 while diffusing between the connection end faces 6 is transmitted to each other. , This bridge-shaped incident light transmission path 2
By 0, the reflection action of each connection end face 6 is suppressed, and abnormal light emission at the connection site is eliminated.

FIG. 5 shows an example of a large-size backlight B according to still another example. The large-size backlight B of this example has the incident end faces 4 on both sides similar to the above and is parallel to the primary light source of a fluorescent lamp. A plurality of edge light panels 1 divided in the width direction
The gel is also connected at the center and used between the incident end faces 4 and the primary light source 10 and between the connection end faces 6 by the same self-adhesiveness. A bridge-shaped incident light transmission path 20 made of transparent silicon is integrally provided.

At this time, the irregular reflection means of the halftone dot pattern on the back surface of the edge light panel 1 is the one having the largest halftone dot area at the center in the same manner as described above, and the primary light source 10 and the The bridge-shaped incident light transmission path 20 between the incident end faces 4 is formed in a sealed shape.

In the large-size backlight B of this embodiment, a comparative example in which the bridge-shaped incident light transmission path 20 is not used and a single edge light panel is used in a butt shape is similarly used. The average luminance was improved, and no abnormal light emission at the connection site was observed.

Although the illustrated example is as described above, the bridge-like incident light transmission path is formed by using a self-adhesive gel-like substance, for example, a stlvent acrylic, and using the self-adhesive light transmission path in the same manner as described above. It is possible to interpose the incident end face and the primary light source or the opposing connection surface so as to be in close contact with the adhesive state of the familiar interview, respectively, by the adhesiveness.

Further, for example, a bridge-shaped incident light transmission path is integrally provided between a reflection end face and a reflection plate provided on the reflection end face or between a reflection end face and a reflection plate provided on the reflection end face. In order to make effective use of reflected light by using an interposed edge light panel in which a pair or each pair of opposing end surfaces are both confronting end surfaces in a plurality of sections of edge light panels, bridges are respectively provided between adjacent opposing end surfaces. In this case, an irregular light transmission path is interposed. In this case, the irregular reflection means should have an appropriate pattern so as to be continuous with another edge light panel. Use general fluorescent tubes and cold cathode tubes that emit light, and roughen part or all of the incident end face or connection end face.
Specific materials of the edge light panel, the incident end face, the primary light source, the bridge-shaped incident light transmission path, the connection end face, including the hairline shape of the diffuse reflection means of the edge light panel,
The shape, structure, quantity, dimensions, addition to these, use as an edge light illuminator, and the like can be variously changed without departing from the gist of the present invention, and are not particularly limited to those illustrated and described above. .

[0029]

As described above, the present invention is configured as described above, and the invention according to claim 1 suppresses the reflection effect of the incident end face in the edge light panel and captures the incident light of the primary light source without incident loss. The light is effectively transmitted and supplied into the edge light panel, greatly improving the brightness of the illumination. The self-adhesiveness of the gel-like transparent material allows the surface of both the incident end face and the primary light source or the face of the opposite connection end face to be familiarized. By adhering to the adhesive state, it is possible to securely adhere to both sides without leaving any gaps, and to cause peeling due to the vibration that may be received by the edge light lighting device. The gel-like transparent material ensures the vibration resistance without hindering the adhesion, and maintains the adhesion by the adhesive state of the familiar interview at all times. It is possible to suppress the reflection effect, prevent the incident loss, and prevent the abnormal light emission stably over a long period of time, and further, without being affected by the heat generated by the primary light source due to the heat resistance of the gel-like transparent material. An edge light panel lighting device that can be easily manufactured can be provided.

According to a second aspect of the present invention, the reflection action of the opposite connection end face of the edge light panel is suppressed to eliminate abnormal light emission at the connection portion, and the self-adhesiveness of the gel-like transparent material makes the primary end face the primary face with the incident end face. By adhering to the surface of both the light source and the surface of the opposing connection end in a familiar face-to-face adhesive state, the two light sources can be firmly adhered to each other without leaving a gap, and the edge light Vibration that may be received by the lighting device does not cause peeling due to peeling, and the adhesion is not hindered.Because it is a gel-like transparent material, the vibration resistance is ensured and the adhesion by the familiar interview is always maintained. In addition, the suppression of the above-mentioned reflection, prevention of incident loss, and prevention of abnormal light emission can be ensured for a long period of time. It is possible to provide an edge light panel illuminating device formed by using a plurality of edge light panels so as to easily connect the illuminating surfaces without being affected by the heat generated by the primary light source due to the heat resistance of the transparent material. .

According to the third aspect of the present invention, in addition to the above, by using a gel transparent silicone suitable as the gel transparent material, the edge light panel lighting device can be easily put into practical use. be able to.

[0032]

[Brief description of the drawings]

 1 is an exploded perspective view of a liquid crystal backlight. FIG. 2 is a partially enlarged longitudinal sectional view showing a main part. FIG. 3 is a longitudinal sectional view showing another example. FIG. 4 is a longitudinal sectional view showing another example. Top view with sash removed

[Explanation of symbols]

 A liquid crystal backlight B large version backlight 1 edge light panel 4 entrance end face 6 connection end face 10 primary light source 20 gel transparent silicon

──────────────────────────────────────────────────続 き Continuation of the front page Examiner Eiichi Yoshida (56) References JP-A-5-158035 (JP, A) JP-A-4-257824 (JP, A) JP-A-5-75736 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 6/00 331 F21V 8/00 601 G02F 1/13357

Claims (3)

(57) [Claims] 1. A bridge-shaped incident light transmission path formed of a heat-resistant, gel-like transparent material that is in close contact with a light source between an incident end face of an edge light panel and a primary light source provided on the incident end face. An edge light illuminating device characterized in that the end surface and the primary light source are brought into close contact with each other by self-adhesion of the gel-like transparent substance so that both surfaces are in close contact with each other. 2. A bridge-like incident light transmission path formed of a heat-resistant, gel-like transparent material that is in close contact with the edge light panel between the opposed connection end faces of the edge light panel. An edge light illuminating device characterized in that both surfaces are made to adhere to each other by the self-adhesion of the transparent substance in a state of adhesion in an interview. 3. The edge light illuminating device according to claim 1, wherein the gel-like transparent substance is made of gel-like transparent silicon.