JPH02217890A - Transmitted light type display plate and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain the transmitted light type display plate of high quality which has uniform transmission brightness by transferring a transmission display layer, consisting of gradation layers formed on transfer foil, so that its final layer faces a display plate main body. CONSTITUTION:The transmitted light type display plate is equipped with a rigid display plate main body 1 formed by uniting a raw material part 1a which transmits light and a raw material part 1b which need not to transmit light. Then the device has the laminar structure formed by stacking the gradation layers 7a - 7d so that the transmitted light has nearly uniform illuminance according to the distance from a light source arranged behind the main body 1, and a transmission display layer 7 which is transferred through an adhering means so that the final layer 7d is positioned on the surface of the main body 1 and a mask layer 9 which is fixed on the surface of the transmission display layer 7 so that some of the display layer 7 is left in a window state and other parts are covered not to transmit the light. Consequently, steps of overlaps of respective printing ink layers are inconspicuous and a sharp display of high quality is made.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a display board for so-called instrument panels, control panels, etc., which are installed in various devices and machinery, and which is used to display information using transmitted light. The present invention relates to a transmissive display panel and a method for manufacturing the same.

(Prior art) For example, as seen in automobile instrument panels, etc.
Some display boards have a display effect that makes scales, numbers, and other displays stand out through transmitted light. In such a display using transmitted light, the illuminance on the display surface changes in inverse proportion to the square of the distance from the light source, so the density of the display is changed near the light source and away from the light source, thereby changing the gradation. It is necessary to arrange.

In conventional instrument panels, screen printing or offset printing is performed directly on the surface of the transparent display board, and the darkest areas are used as a reference, and areas with high brightness are printed with semi-transparent printing. A method is used in which the transmitted luminance is made uniform by repeating printing using ink and suppressing the luminance in areas where the number of printings is large. In the case of screen printing, the gradation is expressed by the size of the ink adhering area due to the plate format, so it is very difficult to obtain uniform gradation with transmitted light. However, in other respects it is suitable for printing on display boards, and gradations are obtained by overprinting pale colors.

(Technical Issues) Conventional display panels formed in this manner have several structural and manufacturing problems. A structural problem is that, especially in the case of screen printing, the overlapping steps of each printing ink layer become conspicuous and conspicuous, degrading the appearance and making it unsightly. This is applied directly to the surface of the display board many times.
This is a fateful thing that happens when printing is repeated.

Manufacturing problems are based on high print runs.

With silk screen printing, as mentioned above.

Many prints must be repeated to obtain the desired gradation,
It is not uncommon for the number of times to exceed 10.

If printing is repeated this many times, the incidence of process defects increases proportionately, and the yield may drop to several tens of percent, resulting in low productivity and high costs. Another problem is that it takes a long time because it is necessary to wait for the ink to dry each time printing is performed.

In addition to the above, examples include those that manufacture transfer foil and simply transfer it onto the display board body, those that print on the display board body surface by combining painting with silk screen or direct offset printing, and transfer printing and direct printing. There are some combinations of.

If only transfer printing is used, it can be manufactured very easily, but since the display board body is a thin plate, thermal transfer tends to cause the body to curl due to thermal distortion, and dust etc. may electrostatically adhere to the body and transfer foil. , defects such as pinholes are likely to occur.

Painting and direct printing on the display board body requires a complicated process, and as with silk screen printing, the defect rate is also high.

In the combination of transfer printing and direct printing, the difference in distortion between the surface and the inside of the display board body becomes noticeable due to the heat pressure during transfer, and cracks are likely to occur due to the penetration of the solvent contained in the ink of the subsequent direct printing ( To avoid this, it is possible to perform direct printing first and transfer printing afterwards, but it is difficult to register during transfer, resulting in a high defect rate (and due to the thickness of the ink, A drawback is that air bubbles tend to accumulate at the edge of printing ink and at the stepped portions of overlapping printing.

The present invention has been made to solve the above-mentioned drawbacks and problems, and its purpose is to make the overlapping steps of each printing ink layer completely inconspicuous, so that an extremely sharp and high-quality display can be obtained. An object of the present invention is to provide a transmitted light type display board and a method for manufacturing the transmitted light type display board that can produce the display board with high efficiency.

(Technical Means) The transmitted light type display board of the present invention that achieves the above object has a rigid display board main body, at least a portion of which is formed of a material that transmits light, and a distance from a light source disposed on the back surface of the main body. It has a layered structure in which a plurality of tone layers are stacked so that the transmitted light has approximately uniform illuminance, and the adhesive means is placed so that the final layer of the plurality of tone layers is located on the surface of the main body. and a mask layer fixed to the surface of the display layer in order to leave a part of the display layer in the form of a window and cover the other part without transmitting light. .

The transmissive display layer is transferred onto the surface of the main body via an adhesive so that the final layer printed at the end of the plurality of gradation layers is located. In other words, the surface of the transferred transmissive display layer is the lowest gradation layer, and the mask layer is fixed to the surface.

Such a structure cannot be obtained by direct printing on the surface of the display board body described above or by simply transferring a transfer foil, because by any of the conventional methods, the outermost layer of the gradation layer is attached to the display board. This is because it always faces the person who sees it, rather than facing the surface.

Therefore, the display board of the present invention is characterized in that it has a structure in which the final layer of the transparent display layer faces the main body side, and the bottom layer faces the viewer side, and is bonded to the display board main body by adhesive means. .

A transmissive light type display board having such a structure includes a step of applying a releasable varnish to one surface of a support made of a thin sheet or film, which is a support member for printing ink, to form a releasable layer, and forming a gradation layer on the releasable layer. A step of printing with ink in layers to form at least two or more gradation layers.

a step of applying an adhesive on the gradation layer to form an adhesive layer; a pre-treatment step of the display board of adjusting the display board body, which has a property of transmitting light at least in part and is rigid, to a required temperature; The gradation M is applied to the surface of the prepared display board body through an adhesive layer.
a step of adhering a support having a gradation layer, a step of peeling off the support at the peeling layer and transferring the gradation layer onto the display board body, a step of leaving a part of the gradation layer on the gradation layer and making it opaque so that no light can pass through It can be manufactured by performing the mask process of printing ink in the same order.

What is important in implementing this manufacturing method is the control of temperature conditions before and after transfer.It depends on the nature of the material used, but generally the base material (display board body) is heated in advance, and then Masking is then performed by thermal transfer at a temperature lower than the transfer temperature, followed by aging at a temperature lower than the transfer temperature.

In the examples, gravure printing was used as an example of printing means for printing on one side of the support, but offset printing or screen printing may also be used, and the purpose can be achieved in either case.

(Example) The structure of the transmitted-light type display board according to the present invention will be described below. FIG. 1 shows a rigid structure in which a material portion 1a that transmits light and a material portion 1b that does not require the same are integrated. A display board main body 1 is shown, and acrylic resin or the like can be used as the transparent material. This display board 1 is molded by a molding die, and has mounting means 2a, 2b,
2c, 2d, parts mounting holes 3a, 3b, 3c, 3d, required windows 4, notches 5 for combination with other structures, etc. are molded at the same time. The illustrated display board is attached to an instrument panel of an automobile, and the target display board A is that of a tachometer.

FIG. 2 shows the transparent display layer 7 transferred to the light-transmitting material portion 1a of such a display board body 1 from the back side. The display J17 was first printed in gravure,
A first gradation layer 7a that determines the color of the display, a second gradation layer 7b overprinted on it except for a part, and a second gradation layer 7b overprinted on the second gradation layer except for a part. third gradation layer 7c,
Furthermore, it consists of a fourth gradation layer 7d which is similarly overprinted,
In the illustrated case, the fourth gradation layer 7d is the final layer. A7a is the same as the first gradation layer (it is the first printed part and indicates the excess area of the tachometer, and is the same as the first gradation layer 7a). are printed in different colors, and a second gradation layer 7b is overprinted thereon. FIG. , the numeral 8b and the different color area 8c are left in a window shape so that the transmissive display layer 7 can be seen through, and the other parts are covered with a mask layer 9 made of dark opaque ink. A method of manufacturing a transmissive display panel having the following structure will be described, but the present invention is not limited to the scope of the example.

Example I.

A release layer was formed by printing a releasable acrylic varnish on a 25 μm thick polyester film as a support (Figures 4(a) and 5(a)), and then coloring was performed using a gradation layer. A gradation layer is formed by overprinting with ink using a gravure method (both figures (b)), and an adhesive layer is formed by applying acrylic/vinyl chloride/vinyl acetate copolymer varnish on the gradation layer (both figures). (c)) Transfer foil B was manufactured.

Next, as shown in Figure 1, the acrylic plate that has been molded as the main body of the display board is pretreated by heating it to 40°C.
)), the transfer foil B was placed on the surface of the display board body at 150°C so that the final layer of the gradation layer was located on the surface side of the body.
At the relatively low temperature of
Then, the gradation layer is transferred onto the display board body by peeling off the support of the transfer foil using a peeling layer, and the gradation layer is transferred onto the display board body at 85°C.
A 15-minute aging process (National Railways (f)), masking by silk screen printing to cover all but the necessary display with opaque ink on (the first layer of) the gradation layer (National Railways (g)) ), Finally, we use reactive mud ink to adjust light reflection and print for surface protection.
After completely drying, a transmitted light type display board was manufactured (Kokoku Railway (h)
).

Example ■.

The same materials and the same steps as Example I were used, but the heating in the pretreatment step (d) of the display board body was set to 50°C, and the adhesion step (
8) Set the temperature at 120℃, and perform aging (
f) was heated to 75° C. for 20 minutes to produce a transmitted light type display board.

In all of these Examples 1 and 11, the overlapping of each ink layer was naturally not noticeable at all, and the transmitted brightness due to the light from the light source placed at a constant distance on the back surface was uniform, so they were of high quality. In addition, in FIGS. 4 and 5, 10 is a support, and 1
1 is a release layer, 12 is an adhesive layer, and 13 is a protective layer, and the reference numerals shown in FIGS. 1 to 3 are used for other common parts.

(Functions and Effects) As is clear from the above description, the transmissive display board of the present invention has a transmissive display layer formed on a transfer foil, which is composed of a plurality of gradation layers, with the final layer facing toward the main body of the display board. Since it has a structure that is transferred so that it faces the display board, the multiple gradation layers face the main body side of the display board (therefore, even if there is a step in the gradation layer, the entire surface will not be affected). Not possible.

In the method of the present invention, the gradation layer is formed by printing on one side of the support by gravure printing, offset printing, screen printing, etc., so it is very easy and time-consuming to print a large number of gradation layers. Compared to methods that require a slow process, such as silk-screen printing directly onto the display body and overlapping gradation layers,
The difference in productivity between them is quite remarkable. Moreover, the incidence of process defects can be drastically reduced, which greatly contributes to improving productivity.

In particular, according to the method of the present invention, the display board body is preheated before transfer, the working temperature is lowered by the amount of heating, and the transfer foil is transferred.
Since aging is then performed, almost no thermal distortion remains. Furthermore, since there is almost no possibility of distortion occurring during the process, no deformation occurs in the main body of the display board, making it possible to manufacture a display board of very high quality.

[Brief explanation of the drawing]

The drawings show an embodiment of the transmitted-light type display board and its manufacturing method according to the present invention, and FIG. 1 is a perspective view of the display board main body;
Figure 2 is a perspective view of the back side of the transmitted-light type display board, Figure 3 is the same (a perspective view of the front side, Figures 4 (a) to (h) are front explanatory views showing the manufacturing process, Figure 5 (a) ) to (h) are cross-sectional views showing similar steps, and correspond to FIG. 4. l...display board main body, 1a...portion that transmits light,
7... Transmissive display layer, 7a... First gradation layer, 7a
... Different color part, 7b... Second gradation layer, 7c... Third gradation layer, 7d... Fourth gradation layer, 9... Mask layer,
DESCRIPTION OF SYMBOLS 10... Support body, 11... Peeling layer, 12... Adhesive layer. Figure 5

Claims (6)

[Claims] (1) A rigid display board body, at least a portion of which is made of a material that transmits light; It has a layered structure in which gradation layers are stacked, and a transmissive display layer transferred via an adhesive means and one of the display layers are arranged so that the final layer of the plurality of gradation layers is located on the surface of the main body. A transmissive light type display board comprising a mask layer fixed to the surface of the display layer in order to leave some parts like windows and cover other parts without transmitting light. (2) The display board body is a molded product at least partially made of transparent acrylic resin or other transparent synthetic resin, and has mounting means for mechanical devices and mounting openings for parts formed on the board surface. 2. The transmitted light type display board according to claim 1, having a structure. (3) The transmissive display panel according to claim 1, wherein a transparent protective layer is fixed to the surface of the mask layer and the surface of the transmissive display layer that is not covered with the mask layer. (4) A step of applying a releasable varnish to one side of a support made of a thin sheet or film, which is a support member for printing ink, to form a releasable layer, and printing using ink with a gradation plate on the releasable layer. a step of forming at least two or more gradation layers, a step of applying an adhesive on the gradation layer to form an adhesive layer, a display having a property of transmitting light at least in part and having rigidity. A display board pre-treatment step of adjusting the board body to a required temperature; A step of adhering a support having a gradation layer to the surface of the prepared display board body via an adhesive layer; A support in the peeling layer. A transmissive light type display board that performs the following steps in the same order: a process of peeling off the body and transferring the tone layer onto the display board body, and a masking process of printing opaque ink that does not allow light to pass through, leaving a portion of the tone layer on the tone layer. manufacturing method. (5) The method for manufacturing a transmissive display panel according to claim 4, wherein the step of forming the gradation layer is performed by gravure printing, offset printing, or screen printing. (6) The removable varnish and adhesive are acrylic, and the display board body is made of acrylic resin.
The transmitted light type display according to claim 4, wherein the gradation layer is transferred to the display body heated to 5°C at a temperature of 110 to 160°C, and then aging is performed at a temperature of 90°C or lower. Method of manufacturing the board.