JPH0715614B2 - Transmitted light display panel and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a display panel such as a so-called instrument panel, control panel, etc., which is installed in various devices and machines, for displaying by transmitted light. The present invention relates to a transmitted light type display panel and a method for manufacturing the same.

(Prior Art) For example, as seen in an instrument panel of an automobile,
2. Description of the Related Art Some display plates have a display effect of making scales, numbers, and other displays stand out by 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. Therefore, the density of the display is changed near the light source and away from the light source, and the gradation is changed. Need to be prepared.

In conventional instrument panels, screen printing or offset printing is performed directly on the surface of the transparent display board body, and the part with the highest brightness has extra semi-transparency based on the darkest part. A method has been adopted in which printing is repeated using ink so that the luminance at a place where the number of times of printing is large is further suppressed and the transmitted luminance is made uniform. In the case of screen printing, since the gradation is expressed by the size of the ink adhesion area from the plate format, it is very difficult to obtain a uniform gradation with transmitted light. However, in other respects, it is suitable for printing on a display plate, and therefore, gradation is obtained by overprinting light colors.

(Technical Problem) The conventional display panel thus formed has some structural or manufacturing problems. A structural problem is that, particularly in the case of screen printing, the overlapping steps of the respective printing ink layers become prominent and conspicuous, so that the appearance is deteriorated and it becomes unsightly. This is a fatal phenomenon that occurs when printing is repeated many times directly on the surface of the display plate body.

The manufacturing problem is based on the high number of prints.
As mentioned above, in silk screen printing, many prints must be repeated to obtain the required gradation, and the number of times is 10
It is not uncommon to exceed the times. If the printing is repeated this number of times, the occurrence rate of process defects will increase in proportion to that, and the yield may drop to several tens of percent, resulting in low productivity and high cost. In addition, it takes time because the ink has to wait for drying each time it is printed.

Other than the above, for example, a transfer foil manufactured and simply transferred to the display board body, a combination of painting on the surface of the display board and direct printing of silk screen or offset, transfer printing and direct printing There is a combination of.

If only transfer printing is used, it is very easy to manufacture, but since the display board body is a thin plate, heat transfer tends to curl the body due to thermal distortion, and dust or the like may be electrostatically attached to the body or transfer foil. However, defects such as pinholes are likely to appear.

The process of coating and directly printing on the display plate body is complicated, and the defective rate is high as in the case of the silk screen printing.

In the combination of transfer printing and direct printing, the difference in distortion between the surface of the display board body and the inside becomes noticeable due to the heat pressure during transfer, and cracks easily occur due to the penetration of the solvent contained in the ink for direct printing after that. Cause problems. To avoid this, it is possible to perform direct printing first and then transfer printing later, but it is difficult to register at the time of transfer, so the defective rate increases, and due to the thickness of the ink The problem that bubbles tend to collect in the portion (1) and the stepped portion of the overprinting appears.

The present invention has been made to solve the above-mentioned drawbacks and problems, and the purpose thereof is to make the overlapping step of each printing ink layer inconspicuous at all, and thus to obtain an extremely sharp and high-quality display. It is an object of the present invention to provide a transmitted light type display plate and a method of manufacturing a transmitted light type display plate that can manufacture the display plate very efficiently.

(Technical Means) A transmitted light type display panel of the present invention which achieves the above-mentioned object is a display panel main body having rigidity, at least a part of which is made of a material that transmits light, and a distance from a light source arranged on the back surface of the main body. According to the above, it has a layered structure in which a plurality of gradation layers are laminated so that transmitted light has an almost uniform illuminance, and an adhesive means is provided so that the final layer of the gradation 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 a window shape and cover the other part without transmitting light. .

The transmissive display layer is transferred via an adhesive means so that the final printed final layer of the plurality of gradation layers is located on the surface of the main body. That is, 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 the direct printing on the surface of the display plate body or the simple transfer of the transfer foil. This is because the outermost layer of the gradation layer does not face the surface of the display plate by any of the conventional methods and always faces the viewer.

Therefore, the display panel of the present invention is characterized in that the final layer of the transmissive display layer faces the body side and the lowermost layer faces the viewer side, and is bonded to the display panel body by a bonding means. .

The transmitted light display plate having such a configuration is a step of forming a peeling layer by applying a peelable varnish on one surface of a support made of a thin sheet or film, which is a supporting member for printing ink, and gradation on the peeling layer. Printing with an ink using a plate to form at least two or more gradation layers; applying an adhesive on the gradation layers to form an adhesive layer; A pretreatment step of adjusting the display plate body having a certain rigidity to a required temperature, a step of adhering a support having a gradation layer to the surface of the prepared display plate body via an adhesive layer, In the same order, the step of peeling the support on the peeling layer and transferring the gradation layer on the display plate main body, and the mask step of printing an opaque ink that does not transmit light while leaving a part of it on the gradation layer. Manufacturing by carrying out It can be.

In carrying out this manufacturing method, it is important to control the temperature conditions before and after transfer, and it depends on the nature of the material used, but generally the base material (display board body) is preheated and the heating is performed. Thermal transfer is performed at a temperature lower by the amount, and then aging is performed at a temperature lower than the transfer temperature. Masking is then performed.

In the embodiments, the printing means on one surface of the support is gravure printing, but offset printing or screen printing may be used, and the purpose is achieved in any case.

(Example) The structure of the transmitted light type display board according to the present invention will be described below. FIG. 1 shows that the material portion 1a that transmits light and the unnecessary material portion 1b are integrated and have rigidity. The display plate body 1 is shown, and an acrylic resin or the like can be used as the transparent material. The display board 1 is molded by a molding die, and is attached to the mechanical devices 2a, 2b, 2c, 2d.
Alternatively, the component mounting openings 3a, 3b, 3c, 3d or the required window 4, the combination cutout 5 with another structure, etc. are formed at the same time. The illustrated display board is attached to an instrument panel of an automobile, and the target display board A is a tachometer.

FIG. 2 shows, from the back side, a state in which the transmissive display layer 7 is transferred to the material member 1a of the display plate body 1 that transmits light. The display layer 7 is a first gradation layer 7a which is first gravure-printed and determines the color of the display, a second gradation layer 7b which is partially overlaid on the first gradation layer 7a, and a second gradation layer. A third gradation layer 7c that is overprinted except for a part thereof, and a fourth gradation layer 7d that is similarly overprinted. In the case shown, the fourth gradation layer 7d is the final layer. . 7a 'is the first printed portion like the first gradation layer, which indicates the excess area of the tachometer, and is printed in a color different from that of the first gradation layer 7a. Layer 7b is overprinted. FIG. 3 is a perspective view of the transmitted light type display panel A according to the present invention viewed from the viewer side.
Portions of the scale 8a, the numerals 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 portions are covered with a mask layer 9 made of a dark opaque ink. Next, a method of manufacturing the transmitted light type display plate having the above-mentioned structure will be described, but the present invention is not limited to the scope of the examples.

Example I. A 25 μm-thick polyester film as a support was printed with a peelable acrylic varnish to form a release layer (FIGS. 4 (a) and 5 (a)), and then gradation Gradation method is used for overprinting with a colored ink using a plate to form a gradation layer (both figures (b)), and a varnish of acrylic / vinyl chloride / vinyl acetate copolymer system is applied and adhered on the gradation layer. A layer was formed (both figures (c)) to produce a transfer foil B.

Next, an acrylic plate molded as shown in FIG. 1 as a main body of the display plate is heated to 40 ° C. to perform a pretreatment ((d) in each figure). 150 layers on the surface of the display board body as an arrangement such that the layers are located on the front surface side
At a relatively low temperature of ℃, it is adhered by the adhesive layer ((e) in each figure), and then the support of the transfer foil is peeled by the peeling layer to transfer the gradation layer onto the display plate main body, Aged at 85 ° C for 15 minutes (each figure (f)),
On the gradation layer (the first layer), masking by silk screen printing is applied to cover other than necessary display with an opaque ink (in each figure (g)), and finally with a reaction type matte ink. After performing reflection adjustment and surface protection printing, it was completely dried to produce a transmitted light display panel ((h) in each figure).

Example II. Same material and same process as in Example I, except that the heating in the pretreatment step (d) of the display plate body is set to 50 ° C. and the temperature in the adhering step (e) is 120 ° C. A transmitted light display panel was manufactured by setting the temperature to ℃ and aging (f) at 75 ℃ for 20 minutes.

In each of these Examples I and II, the overlapping of the ink layers was naturally inconspicuous at all, and the transmission brightness by the light source light arranged on the back surface at a constant distance was uniform and of high quality. In FIGS. 4 and 5, 10 is a support, 11 is a peeling layer, 12 is an adhesive layer, 13 is a protective layer, and other common portions are the same as those shown in FIGS. 1 to 3. Incorporated.

(Operation and Effect) As is apparent from the above description, the transmitted light display panel of the present invention has a transmissive display layer composed of a plurality of gradation layers formed on the transfer foil, the final layer of which is on the display panel body side. Since the plurality of gradation layers face the main body side of the display plate because they have a structure transferred so as to face each other, even if there are steps in the gradation layers, the surface is not affected at all.

In the method of the present invention, since the gradation layers are formed by printing such as gravure printing, offset printing and screen printing on one surface of the support, it is very easy and time-consuming to print a large number of gradation layers. The difference in productivity between them is extremely remarkable as compared with the case where the process progresses slowly like the case where the gradation layer is overlaid by directly performing silk screen printing on the display body. Moreover, since the occurrence rate of process defects can be drastically reduced, it greatly contributes to the improvement of productivity.

In particular, according to the method of the present invention, the display plate main body is preheated before transfer, and the transfer foil is transferred by lowering the working temperature by the heating amount,
Since it is aged thereafter, almost no thermal strain remains. Further, since there is almost no probability that distortion will occur during the process, the display plate body was not originally deformed, and a very high quality display plate could be manufactured.

[Brief description of drawings]

The drawings show an embodiment of a transmitted light display panel and a method of manufacturing the same according to the present invention. FIG. 1 is a perspective view of a display panel main body,
2 is a perspective view of the back side of the transmitted light type display plate, FIG. 3 is a perspective view of the same side, FIGS. 4 (a) to 4 (h) are front explanatory views showing the manufacturing process, and FIG. 5 (a). 5A to 5H are cross-sectional views showing the same process and correspond to FIG. 1 ... Display plate body, 1a ... Light transmitting part, 7 ...
Transmissive display layer, 7a ... first gradation layer, 7a '... different color portion, 7b
... second gradation layer, 7c ... third gradation layer, 7d ... fourth gradation layer, 9 ... mask layer, 10 ... support, 11 ... release layer, 12
…… Adhesive layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mitsunori Komatsu 15 679, Oshima, Yaizu City, Shizuoka Prefecture (56) References JP-A-62-133479 (JP, A) JP-A-62-115490 (JP, A) 55-35738 (JP, U)

Claims (6)

[Claims] 1. The transmitted light has a substantially uniform illuminance in accordance with the distance from a light source disposed on the back surface of the main body and a rigid display panel body, at least a part of which is made of a light transmitting material. Has a layered structure in which a plurality of gradation layers are stacked, and a transmissive display layer transferred via an adhesive means so that the final layer of the plurality of gradation layers is located on the main body surface,
A transmissive display panel comprising a mask layer fixed to the surface of the display layer to leave a part of the display layer in a window shape and cover the other part without transmitting light. 2. The display plate body is a molded product, at least a part of which is made of a transparent acrylic resin or other transparent synthetic resin, and has means for mounting to mechanical devices and a mounting port for parts on the plate surface. The transmitted light display panel according to claim 1, which has a formed structure. 3. The transmissive display panel according to claim 1, wherein a transparent protective layer is fixed on the surface of the mask layer and the surface of the transmissive display layer not covered with the mask layer. 4. A step of forming a release layer by applying a peelable varnish on one surface of a support made of a thin sheet or film, which is a support member for printing ink, and the ink is used by a gradation plate on the release layer. Printing to form at least two gradation layers, a step of applying an adhesive on the gradation layers to form an adhesive layer, which has a property of transmitting light to at least a part and is rigid. A step of pretreating the display board main body having the display board main body having a required temperature, a step of adhering a support having a gradation layer to the surface of the prepared display board main body via an adhesive layer, and the release layer. In the same order, the process of peeling off the support to transfer the gradation layer onto the display plate body, the mask process of printing an opaque ink that does not transmit light leaving a part of it on the gradation layer Manufacturing method of display board. 5. The step of forming a gradation layer comprises gravure printing,
The method of manufacturing a transmitted light type display panel according to claim 4, wherein the method is performed by offset printing or screen printing. 6. The peelable varnish and the adhesive are acrylic, and the display board body is made of acrylic resin.
5. The transmitted light system according to claim 4, wherein a gradation layer transfer process is carried out at a temperature of 110 to 160 ° C., and then aging is carried out at a temperature of 90 ° C. or less on the display body heated to 55 ° C. Manufacturing method of display board.