JP2977791B2 - Synthetic resin molded edge light panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a synthetic resin molded edge light panel used for a surface light source.

[0002]

2. Description of the Related Art In general, synthetic resin molded products are injection molded,
This is to be molded by molding means such as compression molding. The molding surface of the mold used for this is formed by cutting, sandblasting,
This is to be formed by performing mechanical or chemical processing such as electric discharge machining, etching, electroforming, etc., in the case of the synthetic resin molded edge light panel for the surface light source. Is provided with a light guide means on the rear side for guiding the incident light supplied by the primary light source to ensure brightness and uniformity as a secondary illumination. For this reason, the mold is provided with a molding surface processed by processing means such as etching, electroforming, etc. among the above.

[0003]

However, in this case, in order to obtain a synthetic resin molded product, it is necessary to use a mold corresponding to each molded product. In addition, the production of the molds takes place, so it takes too much time and money to produce the molds, which requires a long preparation period for the production of molded products and increases the production cost of molded products. There is a tendency that, for example, in the case of molded products with a short delivery time or a large variety of small-quantity production, these are bottlenecks and the demand cannot be sufficiently satisfied.

The present invention has been made in view of such circumstances, and a solution to the problem is that it is suitable for short delivery time and high-mix low-volume production, enjoys the advantages of molding, and improves brightness to improve brightness. An object of the present invention is to provide a synthetic resin molded edge light panel capable of performing the next illumination.

[0005]

Means for Solving the Problems In accordance with the above object, the invention according to claim 1 is achieved by forming a light guide means of a high-density fine pattern by forming a concave portion such as a dot hole or a hairline on the back side by molding a synthetic resin. An edge light panel comprising: a molding die in which protrusions corresponding to the high-density fine pattern are screen-printed with a heat-resistant ink whose surface shrinks in a grain shape due to volume shrinkage of ink drying. 3. A synthetic resin molded edge light panel characterized in that the bottom surface of the recessed portion such as the dot hole or the hairline is formed as a textured surface corresponding to the textured shrinkage of the upper surface of the projection by performing the process. The invention as described above, the heat-resistant ink in the molding die described above, polyimide-based,
3. A synthetic resin molded edge light panel according to claim 1, wherein the panel is made of one of a polyarylsulfone type and a fluorine type. The concave portion of the means is formed as a dot hole having a uniform depth, so as to form a halftone pattern in which the dot diameter is steplessly changed between the incident end face and the opposing end face. The synthetic resin-molded edge light panel according to 1 or 2, wherein the printing height of the dot projections according to the high-density fine pattern in the molding die is set to 20.
The synthetic resin molded edge light panel according to claim 3, wherein the molding is performed by setting the thickness of the edge light panel to 0 μm to 300 μm. Alternatively, the synthetic resin molded edge light panel according to claim 1, 2 or 3 is formed in a wedge plate shape, and these are the means for solving the above problems as the gist of the invention.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the drawings, wherein A is a surface light source device used as, for example, a liquid crystal backlight, and 1 is a synthetic resin constituting the surface light source device A. The edge light panel 10 provided with the light guide means 2 on the back side by molding, and 10 indicates a molding die used for molding the light guide means 2 for molding the edge light panel 1.

The edge light panel 1 is made of a transparent resin having a high light transmittance, such as an acrylic resin or a polycarbonate resin, and is injected in a flat plate shape or a wedge plate shape having a tapered front or rear surface as shown in the drawing. Molded by molding means such as molding.
0 indicates that the mold surface 11 was subjected to screen printing to form the molding surface 12 by printing. The screen printing ink was heat-resistant ink, and the printing thickness was set by the thickness of the screen plate. The light guide means 2 on the back side of the edge light panel 1 is molded by using the mold 10 to form the molding surface 12 on which the print is formed.
In this example, the printing of the molding surface 12 in the mold 10 is performed by changing the printing area on the molding surface from the reference position in a predetermined direction in a high-density fine pattern. With this configuration, the depression of the light guide means 2 is formed by a high-density fine pattern corresponding to the high-density fine pattern.

At this time, the high-density fine pattern of the molding surface 12 in the mold 10 of the present embodiment is a dot pattern in which dot projections 13 such as a plane circular or polygon are arranged at equal intervals and fine intervals, and The light guide means 2 in the light panel 1 is a dot pattern in which dot holes 3 are arranged according to the dot pattern.

That is, in the present embodiment, the mold 10 is a dot pattern in which short cylindrical small dot projections 13 are densely arranged on a molding surface of a mold base material 11 made of a square or rectangular flat plate. The dot pattern is displaced toward the opposing end from the one end forming the reference position of the mold base 11 to the vicinity of the opposing end facing the same, for example. While the dot diameter is steplessly enlarged and changed toward these intermediate positions, the dot diameter is reduced steplessly from the intermediate position toward the opposite end, so that the printing area of the dot protrusion 13 is reduced. In this case, the dot pattern is changed steplessly so that the above-mentioned intermediate position becomes a peak.
The dot projections 13 are arranged at equal intervals to form a half-tone dot pattern, and the dot diameter is steplessly enlarged or reduced while the positional relationship of the dot projections 13 is maintained unchanged. The light guide means 2 of the edge light panel 1 is formed into a short circle by inverting the light guide means 2 in accordance with the dot pattern of the stepless change, thereby forming a uniform depth. The dot hole 3 having a concave shape forms a halftone pattern in which the dot diameter is steplessly changed between the incident end face 4 and the opposing end face 5, and is inversely proportional to the amount of incident light supplied from the incident end face 4. At the same time, the reflected light from the facing end face 5 is adjusted to ensure the luminance and uniformity of the secondary illumination.

The above-mentioned dot protrusion 1 with respect to the mold substrate 11
The screen printing of the pattern in which the 3 is arranged at a high density may be performed by a conventional method using a screen plate 15. In this case, in this example, the screen plate 15 is made of a base such as a resin film or a metal thin plate. A resist (also referred to as a resist film) is formed by applying a photoresist (also referred to as a photosensitive resin or a photosensitive emulsion) to the substrate and performing photoetching for chemically penetrating and transmitting a printed portion corresponding to the pattern. Good), and by adjusting the thickness of the photoresist applied at this time, the mold substrate 11
In this example, the print thickness of the dot protrusions 13 is determined. In this example, the print height is set to, for example, 100 μm to 500 μm.
m, preferably from 200 μm to 300 μm, a mold 10 for molding the light guide unit 2 of the edge light panel 1 that ensures preferable light guide performance can be formed.

The ink 17 used for the screen printing is a heat-resistant ink in this example, and is made of any of a polyimide-based, polyarylsulfone-based, or fluorine-based ink, thereby providing good heat resistance. The edge light panel 1 can withstand the molding temperature and can be continuously molded.

At this time, in addition to the above-mentioned heat resistance, particularly good adhesion, abrasion resistance and the like are obtained by using the polyimide-based and polyarylsulfone-based inks 17, and particularly by using the fluorine-based ink. Good releasability and the like can be exhibited together.

As a polyimide type, for example, PI (polyimide), PAI (polyamide imide), as a polyarylsulfone type, for example, PES (polyether sulfone), as a fluorine type, for example, PFA (tetrofluoro perfluoroalkyl vinyl ether) Tercopolymer), PTFE (polytetrafluoroethylene), ET
FE (tetrafluoroethylene ethylene copolymer) or the like can be particularly preferably used.

As inks other than the above, for example, boron nitride and molybdenum disulfide are excellent in releasability and the like as in the above-mentioned fluorine-based ink, and can be used as inks according to these. By adding the pigment, printing on the mold substrate 11 can be easily visually checked, which is advantageous in handling.

Reference numeral 14 in FIG.
A frame 5 and a squeegee 16 are used for screen printing.

The mold substrate 11 on which the heat-resistant ink 17 has been screen-printed is completed as a mold 10 by performing a post-drying adhesion process of the ink as required, such as baking. It is set in a molding machine not shown, for example, an injection molding machine, and molding of the edge light panel 1 by a usual method at a molding temperature of, for example, about 250 to 300 ° C.
For example, an acrylic resin may be used. In this case, the mold 10 is used for molding the back surface of the edge light panel 1 and the reference position of the stepless change of the pattern is The light guide plate 1 in which the light guide means 2 is formed on the back side can be obtained by locating the light guide means 2 on the incident end face 4 side of the edge light panel 1.
The light guide means 2 has the shape and depth of the dot projections 13 on the molding surface 12 of the mold 10 formed by printing. Therefore, these shapes and depths can be controlled by the screen plate 15 after all. , Especially the depth,
The printing thickness can be controlled by the thickness of the screen plate 15 which determines the printing thickness.

The mold 10 formed by printing a pattern using the dot protrusions 13 of the present embodiment is designed such that the surface of the dot protrusions 13, particularly the upper surface thereof, contracts in a crimped shape to form a crimped surface due to volumetric shrinkage of ink drying. Since the dot holes 3 of the light guide means 2 are reversed, the surface, particularly the bottom surface thereof, is used as a textured surface, and when used as the edge light panel 1, non-directional irregular reflection of incident light occurs. The surface is easy to shine, which greatly contributes to the improvement of luminance.

The surface light source device A is provided with the synthetic resin molded edge light panel 1 in which the light guide means 2 is molded by using the mold 10 formed by printing as described above, and the molding on the light guide means 2 side. On the front surface, in this example, on the back side, a reflecting plate made of a highly reflective material or a reflecting sheet 6 as shown in the figure, and on the non-light guide means side flat molded surface, in this example, on the front side, a highly light diffusing material. A diffusion plate or a diffusion sheet 7 as shown in the figure is laminated, and a reflection tape 8 made of a highly reflective material is adhered to an end face other than the incidence end face 4, that is, a reflection end face as necessary. A primary light source 9 such as a cold-cathode tube fluorescent lamp is provided on the end face 4, and incident light is supplied from the primary light source 9 to the edge light panel 1 via the incident end face 4. Advance of incident light Dot hole 3 that will be located on the road
Of the edge light panel 1
Is illuminated to perform secondary illumination as the surface light source device A. At this time, the light guide means 2 makes a stepless change that enlarges and changes the dot diameter and further reduces and changes in this example. With such a structure, it is possible to achieve high brightness and high uniform light guide according to the amount of incident light, and the surface of the dot hole 3 formed by the dot projections 13 having the textured surface, in particular, the textured surface at the bottom and bottom surface thereof, By acting to promote the light guide of the incident light, and particularly to further improve the luminance, it is possible to perform bright and uniform secondary illumination as the surface light source device.

Since the edge light panel 1 is molded using the mold 10, a uniform and high quality product can be obtained with a high yield. In addition, the mold 10 is printed and formed by the screen printing. By using a single screen plate 15, a plurality of molds having the same molding surface 12 can be formed so as to be duplicated as they are.
It is possible to eliminate variations in the axes, the Y-axis, the Z-axis direction, and especially the Z-axis direction, and even if the mold 10 is replaced according to the molding amount, the quality of the light guide plate 1 before and after replacement is the same. There is no variation in quality due to the exchange of the mold 10, and it is possible to always make the mold highly uniform.

Although the illustrated example is as described above, the light guide means of the high-density fine pattern is configured as a line pattern such as a hairline, a dot pattern of random arrangement, and the like, and the light guide means is arranged in a predetermined direction from the reference position. Including one-step, multiple-direction, or radial direction, the diameter and width of the mold can be changed steplessly to secure the light-guiding performance.
The specific materials, shapes and structures of the heat-resistant ink, the light guide means, and the edge light panel, their relationships, and additions to them may be those of various embodiments unless they violate the gist of the invention. it can.

[0021]

Since the present invention is configured as described above, the present invention according to claim 1 is suitable for short delivery time and high-mix low-volume production, enjoys the merits of molding, and has advantages such as dot holes and hair lines. The grained surface on the bottom surface of the recessed portion promotes the light guide of the incident light, and it is possible to provide a synthetic resin molded edge light panel with particularly improved luminance. The invention according to claim 3 is the one in which, in addition to the above, the light guide means has a particularly preferable form, and the brightness and uniformity of the secondary illumination are highly ensured. The invention described in claim 4 has a form in which preferable light guiding performance is ensured as the light guide means for the dot holes, and the invention described in claim 5 shows the form of an edge light panel in addition to the above. That Can be.

[Brief description of the drawings]

FIG. 1 is a side view showing a model of screen printing on a mold substrate.

FIG. 2 is a perspective view of a mold.

FIG. 3 is an enlarged sectional view of a mold.

FIG. 4 is a cross-sectional view of the edge light panel.

FIG. 5 is an enlarged sectional view of the edge light panel.

FIG. 6 is an exploded perspective view of the surface light source device.

[Explanation of symbols]

 A surface light source device 1 edge light panel 2 light guide means 3 dot hole 9 primary light source 10 mold 11 mold base 12 molding surface 13 dot protrusion 15 screen plate

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B29L 11:00 (72) Inventor Goichiro Kido 268-1 Naka, Koritsucho, Kitatsukatsugi-gun, Nara Nagase Inteco Corporation (72) Invention Person: Kudo Sh 振 saku 262-1 Nakase, Kitakatsuragi-gun, Hiroryo-cho, Nara Prefecture Inside Nagase Inteco Corporation (56) References JP-A-5-210004 (JP, A) JP-A-9-125105 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) B29C 33/38 B29C 33/42 B29C 45/37 G02B 6/00

Claims (5)

(57) [Claims] 1. An edge light panel provided with a light guide means of a high-density fine pattern by a concave portion such as a dot hole or a hairline formed on a back side by molding a synthetic resin, wherein the molding is performed with a volume of ink drying. By using a molding die in which the projections according to the high-density fine pattern are screen-printed with a heat-resistant ink whose surface shrinks in a crimped manner due to shrinkage, the dot holes, the recessed bottom surface of the hairline, etc. A synthetic resin molded edge light panel, characterized in that the projection has a textured surface corresponding to the textured shrinkage of the upper surface. 2. The synthetic resin-molded edge light panel according to claim 1, wherein the heat-resistant ink in the molding die is made of one of polyimide, polyarylsulfone, and fluorine. . 3. A halftone dot whose step diameter is changed steplessly between an incident end face and an opposing end face, wherein the depressed portion in the light guide means of the high-density fine pattern is a recessed dot hole having a uniform depth. The synthetic resin molded edge light panel according to claim 1 or 2, wherein the panel forms a pattern. 4. The printing height of dot projections corresponding to the high-density fine pattern in the molding die is set to 200 μm to 300 μm.
The synthetic resin-molded edge light panel according to claim 3, wherein the molding is performed by setting the thickness to μm. 5. The edge light panel according to claim 1, wherein the edge light panel has a flat plate shape or a wedge plate shape.
The synthetic resin-molded edge light panel according to 1.