JPS61100701A - Light beam direction control plate - Google Patents

Abstract

PURPOSE:To obtain a light beam direction control plate suitable for mass production by juxtaposing light beam absorptive layers at a prescribed pitch on both surfaces of a transparent plate. CONSTITUTION:The light beam absorptive layers 2, 3 having widths (a), (c) and light beam transmission parts 4, 5 having widths (b), (d) are juxtaposed on both surfaces H, H' of the transparent plate 1 having a thickness (e) to form the light beam direction control plate. The widths (a), (c) of the light beam absorptive layers, the widths (b), (d) of the light beam transmission part and the angles alpha-beta of light beam transmission are assigned and the range of the thickness (e) of the transparent plate is limited. The light beam direction control part which allows the transmission of only the light beams between alpha-beta is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a light beam control plate that transmits only light beams in a predetermined direction.

[Conventional technology]

A typical conventional light beam direction control plate has a structure in which a light transmitting portion and a light absorbing portion are laminated in a sagging pattern.

The manufacturing method is mainly shown in Japanese Patent Publication No. 55-33275. A method is used in which a large number of parallel linear pattern original plates are cut vertically or diagonally with a knife at predetermined intervals, and both sides are subjected to section finishing, or a trial film is pasted on both sides.

This method has problems in that the step of laminating and adhering a large number of sheets with an adhesive on their surfaces is complicated, and that the thickness of the transparent layer and the adhesive layer is uneven.

Furthermore, when finishing the cut surface, the process of polishing it to a mirror surface is laborious, and the method of sandwiching it with a film also results in a flat surface.

Or Special Publication No. 57-s3703, Special Publication No. 57-189
This method uses a photosensitive resin as typified by No. 128.

A photosensitive layer of 1 m in thickness is provided with a uniform thickness, and actinic rays are irradiated through a pattern original plate having negative or positive light scattering patterns of many parallel linear patterns or many mesh patterns. The resin is photocured into a pattern with a certain DI, and the uncured portions are washed and removed to obtain a plate-like body having a large number of parallel linear patterns or a large number of finely sized patterns.

Note that in the former case, a colored resin layer having approximately the same thickness as the cured photosensitive resin layer is then provided in the removed portion.

The latter dyes the cured photosensitive resin layer.

In this method of using a photosensitive resin, the photosensitive resin layer diffuses light during photocuring, so it tends to become trapezoidal.
Also, the bottom part has an R shape that makes it easy to hold.

Parallel ray irradiation and double-sided irradiation to minimize this trapezoid and bottom R shape are also considered, but the device for obtaining parallel rays is
At present, only devices that obtain low energy are available, and the cost of the devices is also high.

For double-sided irradiation, it is difficult to align the top and bottom.

Furthermore, since this type of photosensitive resin undergoes chain-type photocrosslinking, the height of the photocured layer is also a factor, but the width of the uncured layer must be quite wide.

Furthermore, the edges of the photocured layer are also difficult to sharpen.

The conventional light beam direction control plate has various problems as described above because of the manufacturing method described above.

[Problem that the invention seeks to solve]

The present invention provides a light beam direction control plate that does not have the above-mentioned structural problems and does not generate total heat.

[Means for solving problems]

The configuration will be described in detail as follows with reference to the accompanying drawings showing an example of implementation.

Width arc on both sides H and H of transparent plate (1) with thickness e
A light-absorbing part (41 (5) having a width of d and a light-ray absorbing part (41 (5) having a width of d) is formed in parallel.

Figure 1 shows the case where the upper and lower ray transmission angles β and α are the same,
FIG. 2 shows a different case.

Because it has such a shape, the light MA that was absorbed in the light absorption layer in contact with the light transmission part in the conventional light direction control plate shown in FIG. 3 becomes the light absorption WIc+= in FIG.
g & collected (ray A').

A problem here arises when a light beam entering from one light transmitting section is transmitted through two or more light transmitting sections.

Of course, if it is used for such a purpose, it will not be an error, but in order to obtain the same effect as the conventional light beam direction control board, the light beam entering and exiting from one light beam direction control board must be Light Ha% must be transmitted from the continuous part and is constant (7)
You will be subject to restrictions.

Here, the method for calculating the warpage is shown in the order of the experiment.

Width of light absorption layer a( Width of light transmitting part bd Transparent plate thickness e Refractive index of transparent plate n Light transmission angle α−β Pitch deviation p Specify a, b, and α, and find the range of e using the following formula.

This formula is the certain restriction mentioned above.

In this formula, α is the angle when the upper and lower light transmission angles are the same as shown in FIG. 1, and is the larger angle when they are different as shown in FIG.

Next, determine e that satisfies the above conditions, and calculate d, e, and p using the following equations.

d = e (tan (arcsln (-5111
a ) ) +tan(arcsin(”s+nβ))
)-bn
nc = a + b -d p= b -e tan (arcsin (-!-s
inβ)) If it is necessary to review the value of d (if d becomes too small, if the balance of the intensity of transmitted light must be considered, if there are restrictions on the manufacturing method, etc.), b If + d = b' + d', equivalent beam direction control is possible, so re-1ia',
Specify b and find d'', C'', and p'.

"+ b + C + d (or a", b
'.

By forming a light absorbing layer and a light transmitting portion having a width of C" and d' on a transparent plate having a thickness of e, a light direction control plate that transmits only 6 to 1 light rays can be obtained.

Note that all calculation formulas of the present invention assume that the thickness of the light absorption layer is 0.

As long as the light absorption layer sufficiently absorbs light, its thickness is extremely thin and poses no problem.

However, the transparent plate is thin and the light is 1! If the thickness of the absorbing layer cannot be assumed to be 0, the thickness of the transparent plate is reduced by - the thickness of the light absorbing layer, but the thickness e of the transparent plate is e゛ = (thickness of the transparent plate) + (thickness of the light absorption layer on both sides) and d+
It is good to find C and p.

The problem of the present invention is the transmission through the bird's light transmitting layer.
This problem can be solved by increasing the width of the light absorption layer.

However, if the width of the light absorption layer is limited, this problem can be solved by stacking two or more C2 layers as shown in FIG.

In FIG. 4, the light ray B' incident at the same angle as the width of the light absorption layer in FIG. 1 is absorbed by the light absorption layer of the intermediate layer (1).

In other words, a light beam direction control plate having the same light transmission angle and the same thickness and a light absorbing layer having a width of 10 was obtained.

Shichiro 哄YO na 4 Yua - This is the same even in the case of α≠β.

In the light beam direction control plate of the present invention, the lengths of the light absorbing layer and the light transmitting portion can be formed into a number of parallel linear patterns, a number of mesh patterns, a circle, or a polygon, depending on the direction of the convex rays to be controlled. ◇ In the light beam direction control plate of the present invention, a colored transparent plate may be used (it is also possible to color the transmitted light Mt from the second side).

In the light beam direction control plate of the present invention, if surface reflection of the light beam direction control plate is a concern depending on the use, surface reflection can be reduced by matte processing, coating with a low refractive index substance, non-reflection coating, etc.

〔Example〕

Next, a method for manufacturing the light beam direction control plate of the present invention will be described.

The transparent plate (1) is a glass plate, a plastic plate such as acrylic, vinyl chloride, polycarbonate, PS, or PET.

Possible materials include plastic films such as cellulose, nylon, and Tetron.

As the light absorption layer, a liquid resin to which pigments and dyes such as carbon black, oil smoke, and aniline black are added as colored substances may be used.

As the liquid resin, common reaction-curable and dry-hardening resins such as unsaturated polyester, epoxy, and rubber resins can be used.

Also, photocurable and photoseparable photosensitive resins can be used.

Other thermoplastic resins can also be used.

Light i! i! There are various printing methods (lithographic printing, letterpress printing, offset printing, screen printing, gravure printing, etc.) for attaching the absorbing layer to the transparent plate, taking into account the properties of the transparent plate and the line width, pitch, etc. of the light absorbing layer. It can be resisted by bending. As a more primitive method, it is also possible to use various coating methods such as masking the light-transmitting parts and spray coating.

If a narrower pattern is required, it is better to use a method using photosensitive resin. In this case, Rikihanmushi≠also,
The energy required for curing is also very low.

Regarding pitch alignment on both sides, if the width of the light absorption layer is large, sufficient precision can be expected even if pitch alignment is performed on both sides simultaneously or by printing twice on both sides.

However, if pitch alignment exceeding the mechanical precision of printing is required, it is desirable to adopt the following method using a photosensitive resin.

In Figure 1, after forming a predetermined pattern on the H side,
Apply a positive photoresist with pigment dispersed on the H° surface.

Next, a parallel light beam is irradiated from the H side, followed by alkali cleaning to obtain a light beam direction control plate.

In addition, even when the light absorption layer is misaligned as shown in Fig. 2, it can be shaped by irradiating the parallel light rays obliquely.0 [Effects of the Invention] The light beam direction control plate of the present invention is as shown in the conventional Fig. 3. Unlike the type that has a light absorption layer and a light transmission part that are integrated up to the F-F' plane, two light absorption layers on both sides of the transparent plate are arranged side by side at a predetermined pitch, so the direction of the light rays can be changed. The control is no different from conventional products, and the manufacturing method allows the formation of a light absorption layer simply by ordinary printing techniques, making it an extremely simple light direction control plate suitable for mass production, making it suitable for the following fields: It can be used to demonstrate long-lasting characteristics in practical use.

Applications - A light shielding plate that is attached to the display surface of CRT, LED, plasma display instrument panels, etc. to suppress the irradiation of external light onto the display surface and increase contrast. - A light irradiation angle control board that is attached to the protective cover of interior lamps, etc.・Blinds attached to window glass, etc.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views showing examples of the light beam direction control plate of the present invention. FIG. 1 shows the case where the upper and lower light ray transmission angles are the same, and FIG. 2 shows the case where the upper and lower light ray transmission angles are different. Figure 3 is a cross-sectional view showing an example of a conventional light beam direction control plate. 〇Figure 4 is a cross-sectional view of a light beam direction control plate with the same thickness as the first factor and the width of the light absorption layer +. It is. Figure 5 shows two layers of the light beam direction control plates shown in Figure 4, where the thickness of the two layers is 1 and the thickness is +.
This is a cross-sectional view of a light beam direction control plate having the same thickness and the same light transmittance as the light beam direction control plate shown in the figure, and further has a light absorption layer width i+. )...H-plane light absorption layer, (3
)・. 81 side light absorption layer, (4)...H side light transmission part, (
5)...81-plane light entry/retreat part, (a)...Length of the light-absorbing layer on the H-plane, (b)--Length of the light-transmitting part on the H-plane, (C
)...Length of the light absorption layer on surface 81, (d)...Length of the light transmission part on surface 81, (e)...Thickness of transparent plate, (9)...
・Pitch deviation, (α)V? )...Light ray transmission angle. % / /ka Dominant S Luha Job 51 - Risa 3rd grade

Claims (1)

[Claims] 1. Light absorption layers of a predetermined width are arranged in parallel at a predetermined pitch on both sides of a transparent plate, and a light transmission part is formed between the light absorption layers arranged in parallel. A light beam direction control plate characterized in that the direction of transmitted light is controlled by the thickness of the transparent plate, the refractive index of the transparent plate, the width of the light absorbing layer, the width of the light passing portion, and the deviation of the opposing light absorbing layer. 2 Light-absorbing layers of a predetermined width are arranged in parallel at a predetermined pitch on both sides of a transparent plate, and a light-transmitting part is formed between the light-absorbing layers arranged in parallel, and the thickness of the transparent plate and the thickness of the transparent plate are A light beam characterized by a stack of two or multiple single light beam direction control plates that control the direction of the transmitted light beam based on the refractive index, the width of the light absorption layer, the width of the light transmission part, and the deviation of the opposing light absorption layer. Directional control board. 3. The light beam direction control plate according to claim 1 or 2, wherein a light reflecting layer is provided in place of the light absorbing layer.