JPS61105503A - Light transmission range regulating screen and its production - Google Patents

Abstract

PURPOSE:To control sufficiently the direction of a transmitted light by providing an opaque perforated plate which has many polygonal holes formed by precise punching. CONSTITUTION:Many polygonal holes are provided continuously in an opaque plate-shaped material by precise punching to form an opaque perforated plate 11 having many polygonal holes. The perforated plate 11 has many rectangular holes 12 surrounded with longitudinal connecting parts 11a and transverse connecting parts 11b, and holes 12 have the same shape in every one span in the punching direction. Especially, positions of rectangular holes 12 are shifted in the transverse direction in every other row by a half pitch in the longitudinal direction orthogonal to the lengthwise direction of rectangular holes 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light transmission range regulating screen used in an illumination display device and a method for manufacturing the same.

[Conventional technology and problems]

Japanese Unexamined Patent Publication No. 57-189439 discloses a light-shielding screen in which a transparent plate is provided with louvers in a striped pattern, a checkered pattern, etc. made of a photosensitive resin composition.

This light-shielding screen is produced by sequentially laminating a photosensitive resin composition and a transparent image carrier having a transparent part and a non-transparent part on a transparent plate, and exposing the transparent image carrier to actinic rays from the side. It is made by removing the carrier and the non-exposed area of the photosensitive resin composition.

In this production method, when the photosensitive resin composition is crosslinked with actinic rays, if the photosensitive resin layer becomes thick, the actinic rays will not reach deep parts, resulting in insufficient crosslinking and insufficient curing. Therefore, even if a transparent photosensitive resin composition is used, the height of the louver is 100. ljm is the limit.

Therefore, when this manufacturing method is applied to manufacturing a light transmission range regulating screen, direction regulation of transmitted light becomes insufficient. Further, for the same reason, the crosslinking density at the bottom of the louver tends to be low, resulting in the problem that the louver may partially detach from the transparent plate due to manual rubbing or the like.

In addition, when using a transparent photosensitive resin composition in this manufacturing method, it is necessary to wash away the uncured areas after exposure and then dye the remaining cured areas, resulting in the problem of increased manufacturing man-hours. .

JP-A-51-44186 discloses that a transparent layer, a reflective layer, and a light shielding layer are successively laminated and bonded to form a block body.
A method of manufacturing a light transmission range regulating screen is disclosed in which a sheet-like light transmission range regulating screen is cut out from this block body by planing on a surface that is perpendicular to or at a predetermined angle with respect to the surface of the transparent layer, etc.

In the case of this manufacturing method, there is a problem that the thickness of the cut-out light transmission range regulating screen tends to vary locally, which often results in products that are unusable, resulting in poor product yield. Furthermore, since the light transmission range regulating screen is cut out using a planing knife, the cut surface becomes a rough surface, and light transmission becomes poor due to scattering on the surface. Therefore, it is necessary to make the surface of the light transmission range regulating screen clear by polishing the cut-out surface or applying a mirror plate to the cut-out surface and applying a hot press.

Additionally, when cutting out the light transmission range regulation screen with a knife, the light transmission range regulation screen curves outward from the block body, so it is necessary to correct the curvature of the cut out light transmission range regulation screen using a hot press. .

[Means and effects for solving the problems] In order to solve the above problems, the first invention of the present invention includes an opaque perforated plate having a large number of polygonal holes formed by precision punching. To provide a light transmission range regulating screen.

Further, a second aspect of the present invention is to form an opaque perforated plate having a large number of polygonal holes by continuously providing a large number of polygonal holes in an opaque plate-like material by precision punching. A method of manufacturing a light transmission range regulating screen is provided.

Preferably, a transparent protective film is laminated and adhered to the perforated plate after punching.

According to the above manufacturing method, it is possible to obtain a light transmission range regulating screen having a thickness sufficient to regulate the direction of transmitted light. In addition, since the desired shape is processed only by a punching process, it can be manufactured easily. Moreover, since the target shape is integrated, there is no risk of the shape being distorted. Furthermore, since it is sufficient to punch out a plate-like material of uniform thickness, variations in thickness are less likely to occur, and a smooth surface can be easily obtained. Furthermore, since the plate material can be moved and punched out continuously, a light transmission range regulating screen of any size can be obtained.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

In the first step of the present invention, a plate-shaped material is punched out by precision press processing, which is used in the manufacture of IC lead frames. In the punching process, the punched part has a fine shape,
In addition, a pair of progressive molds each having a punch and a die made of cemented carbide are attached to a press molding machine, and a plate-shaped material is successively inserted between the progressive molds.

Materials for plate materials include brass, copper, stainless steel, iron,
Metals or alloys such as aluminum and nickel are preferred from the viewpoint of ease of punching, but are not limited to these materials.As long as they are opaque plate-like materials, light-shielding materials such as black or dark blue may be used. It may also be made of highly colored plastic. In terms of shape, the plate material may be a sheet material, a strip (short) material, a coil material, etc., but among these, the coil material is the most suitable because it can be processed efficiently and continuously. The thickness of the plate-like material is 100~2, considering the accuracy of punching process, the regulation range of transmitted light, etc.
A range of 000 μm is desirable. The width of the plate material depends on the size of the progressive die.

By the punching process described above, a large number of polygonal holes are continuously provided in the plate-shaped material. FIGS. 1 and 2 show the punched shape of a perforated plate 11 formed by punching a plate-shaped material. The perforated plate 11 shown in FIG. 1 has a large number of rectangular holes 12 surrounded by vertical joints 11a and horizontal joints 11b, and the perforated plate 11 shown in FIG. It has a large number of substantially square holes 12 surrounded by a portion 11b. In the perforated plate L1 shown in FIG. 1 and the perforated plate 11 shown in FIG. 2, the holes 12 have the same shape every l span in the punching direction. In particular, in the perforated plate 11 shown in FIG. 1, the positions of the rectangular holes 12 are shifted in the horizontal direction by half a pitch every other row in the vertical direction perpendicular to the longitudinal direction of the rectangular holes 12. In the case of such an arrangement, the horizontal connecting portions 11 between the vertical connecting portions 11a
Since the length b is approximately half that of the rectangular hole 12, it becomes difficult to bend at the horizontal connecting portion 11b. therefore,
Such an arrangement form is preferable when the holes 12 are long holes.

Further, in the perforated plate 11 shown in FIG.
b plays a role in regulating the transmission angle of transmitted light, but the vertical connecting portion 11a has nothing to do with regulating the transmission direction. Moreover, this vertical connecting portion 11a becomes an obstacle that blocks transmitted light.

Therefore, if the vertical connecting portions 11a are aligned in the vertical direction as shown in FIG. become. On the other hand, in the case of the arrangement shown in FIG. 1, the lines that block light in the vertical direction are divided, so that the shielding lines become less noticeable. Note that the inner shape of the holes 12 in the perforated plate 11 directly affects the regulated range of transmitted light (visible angle of transmitted light), so the punching process must be performed with care to avoid burrs, sag, scratches, warping, etc. be.

Preferably, as shown in FIG. 3, protective films 13 and 14 are overlaid and bonded to the screen surface of the perforated plate 11 after punching using adhesive 15, respectively, as shown in FIG. The protective films 13 and 14 serve to protect the surface of the perforated plate 11 from damage such as scratches and cuts. It is also useful when the manufactured perforated plate 11 is decorated with printing or the like.

It is preferable that the protective films 13 and 14 be as transparent as possible, and have as uniform a thickness as possible without any variation in thickness. Protective film 13.1
4, as the thickness increases, the light transmittance decreases and the entire screen becomes dark, so the thickness is preferably about 20 to 3000 μm. Examples of the material of the protective films 13 and 14 include:
Vinyl chloride resin, cellulose resin, acrylic resin, polyester resin, polycarbonate resin, etc. can be used.

In order to make the light transmittance as good as possible, an adhesive as transparent as possible is used to bond the protective film 13, 14 and the perforated plate 11. As the adhesive 15, it is desirable to use an adhesive that is resistant to discoloration, such as epoxy, polyester, silicone, urethane, polyamide, vinyl chloride, or the like. When bonding, it is important to have a smooth finish and to do it quickly to prevent foreign matter from entering. To aid adhesion and to uniformly cure the adhesive, apply a uniform pressure (preferably 5 to 5
100 kg/cm2), uniform temperature (preferably room temperature to 200°C) and sufficient time (0.1 to 100 hr
) is desirable.

FIG. 4 shows the transmission regulation range of the light transmission range regulation screen obtained by the present invention. In FIG. 4, light transmitted from a lighting device (not shown) through the holes 12 of the perforated plate 11 in the light transmission range regulating screen is regulated within the range of angle θ. Therefore, for example, if this light transmission range regulating screen is used in a display section of a lighting device for instruments such as an automobile, it is possible to prevent illumination light from being reflected on a window glass when driving at night.

〔Effect of the invention〕

As is clear from the above description, according to the manufacturing method of the present invention, it is possible to easily obtain a light transmission range regulating screen that can sufficiently regulate the direction of transmitted light. Further, it is possible to obtain a light transmission range regulating screen having a uniform thickness and a smooth light transmission surface.

〔Example〕

A brass coil with a thickness of 0.1 m++ and a width of 100 IIWl was continuously punched out using a precision press machine using a progressive die. The punched hole shape is 0.1 m long and horizontal (width direction).
A punched plate-shaped material having a rectangular shape of 90 ml+ and a remaining width between holes of 50 pm was cut into 200 mm length pieces.

A transparent polyester film (Nilmirror #100 manufactured by Toshi Co., Ltd. manufactured by Toshi Co., Ltd. T2O)
was glued.

The adhesive is a thermoplastic resin nylon-12 film adhesive with a thickness of 80 μm (Daicel Chemical: Diamid 31).
02) at a temperature of 160°C, applying a pressure of 5 kg/cm2, hot pressing for 5 minutes, cooling under the same conditions for 10 minutes, then taking it out from the hot pressing machine, and applying a pressure of 5 kg/cm2 to transmit light. Got a range control screen.

The light transmission range regulating screen obtained in this way is
The louver height was 100 μm, the louver width was 50 cIm, and the louver spacing was 100 μm. When applied to the display section of an automobile speed lighting device, there was no window reflection at night and it showed good effects.

[Brief Description of the Drawings] Fig. 1 is a partial front view of a perforated plate showing an example of the shape of the perforated plate obtained by the present invention, and Fig. 2 is a partial front view of a perforated plate obtained by the present invention. FIG. 3 is a partial front view of a perforated plate showing an example, FIG. FIG. 3 is a cross-sectional view showing a restricted range of transmitted light of a light transmission range restricted screen; 11--Perforated plate, 12--One hole, 13.142--Protective film, 15--Adhesive. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] 1. A light transmission range regulating screen comprising an opaque perforated plate having a large number of polygonal holes formed by precision punching. 2. The light transmission range regulating screen according to claim 1, wherein a transparent protective film is laminated and adhered to the surface of the perforated plate. 3. The light transmission range regulating screen according to claim 1, wherein the polygonal holes of the perforated plate have the same shape for each span in the punching direction. 4. Light transmission range regulation characterized by forming an opaque perforated plate having a large number of polygonal holes by continuously providing a large number of polygonal holes in an opaque plate-like material by precision punching. Screen manufacturing method. 5. The light transmission range regulating screen according to claim 4, characterized in that a transparent protective film is overlaid on the surface of the perforated plate and adhered with an adhesive.