JP2020148654A - Display board, timepiece, joint body, and method for manufacturing display board - Google Patents

Abstract

To obtain a metal-tone reflection light in a display board without forming fine irregularities in a polarizer.SOLUTION: A display board 100 includes: a transparent film 10; a reflection film 20; and a transparent adhesive 30 between the transparent film 10 and the reflection film 20, the adhesive being formed by joining the transparent film 10 and the reflection film 20 to each other to integrate the transparent film 10 and the reflection film 20. Fine irregularities 11 are formed in a front surface 10a of the transparent film 10, which is the opposite surface to a back surface 10b facing the reflection film 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a display board, a clock and a joint, and a method for manufacturing the display board.

As the display plate used for the dial of a clock or the like, a metal material tends to be preferred because it gives a high-class feeling. One of the reasons why metal materials give a high-class feel is the reflected light on the surface. That is, a display plate made of a metal material having a fine uneven pattern such as a sunray or a sunburst that can obtain reflected light has a reflected light peculiar to metal that is different from a glossy mirror surface. Is obtained.

However, since the display plate made of a metal material does not easily transmit light or radio waves, it cannot be applied to a watch in which a solar cell that receives sunlight or an antenna that receives radio waves is arranged under the display plate.

Therefore, there is a demand for a display board made of a non-metal material that can obtain reflected light (metal-like reflected light) similar to that of metal while transmitting light and radio waves. As such a material, for example, there is a material using a reflective polarizing plate (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-163568

The reflective polarizing plate disclosed in Patent Document 1 has a concentric pattern, a spiral pattern, a striped pattern, a radial pattern, a sandy pattern, a satin pattern, a stone-like pattern, a mesh pattern, a lattice pattern, and abbreviated on the surface. The above-mentioned metallic reflected light is obtained by forming fine irregularities such as a pyramid-shaped repeating pattern, an embossed pattern, an Asahi light pattern, or another geometric pattern.

It is advantageous to form such fine irregularities by, for example, thermal transfer, because a large number of such fine irregularities can be formed in a short time. However, in order to form fine irregularities by thermal transfer, the polarizing plate needs to have high heat resistance.

The present invention has been made in view of such circumstances, and is formed of a non-metal material capable of obtaining metallic reflected light without forming fine irregularities on a reflective film such as a polarizing plate. It is an object of the present invention to provide a method for manufacturing a display board, a clock, a joint, and a display board.

The first aspect of the present invention is a transparent adhesive which is interposed between a transparent film, a reflective film, the transparent film and the reflective film, and the transparent film and the reflective film are bonded and integrated. A display plate having fine irregularities formed on the front surface of the transparent film opposite to the surface facing the reflective film.

The second aspect of the present invention is a timepiece using the display plate according to the present invention as a dial.

A third aspect of the present invention is a transparent adhesive that is interposed between the transparent film, the reflective film, the transparent film, and the reflective film, and the transparent film and the reflective film are joined and integrated. The transparent film has fine irregularities formed on the front surface of the transparent film opposite to the surface facing the reflective film, so that a display plate can be obtained.

In the fourth aspect of the present invention, the transparent film and the reflective film are integrally bonded by interposing a transparent adhesive between the transparent film and the reflective film, and the transparent film is integrally bonded by the transparent adhesive. This is a method for manufacturing a display plate, in which fine irregularities are formed on the film and the reflective film on the surface of the transparent film opposite to the surface facing the reflective film by thermal transfer.

According to the method for manufacturing a display plate, a clock, a joint, and a display plate according to the present invention, the reflected light is metallic and is formed of a non-metal material without forming fine irregularities on a reflective film such as a polarizing plate. Can be obtained.

It is sectional drawing which shows the structure of the display board which is one Embodiment of this invention. It is a figure by the photograph of an example which shows the state of the reflected light when seen from the front surface side (transparent protective plate side) of the display plate shown in FIG. It is a schematic diagram which shows the process of forming the joint body which integrated the transparent film and the reflective film with a transparent adhesive in an example of the manufacturing method of a display board. It is a schematic diagram which shows the process of arranging the joint body between a pattern jacket and a holding plate in an example of the manufacturing method of a display plate. It is a schematic diagram which shows the process of forming the fine uneven pattern on the front surface of a transparent film by heat transfer by the heat press lower plate and the heat press upper plate in an example of the manufacturing method of a display plate. It is a schematic diagram which shows the process of opening a pattern jacket and a holding plate in an example of the manufacturing method of a display board. FIG. 6 is a photograph showing how three joint members (members having a size corresponding to a display plate) are formed on a joint of one transparent film and a reflective film manufactured by the steps shown in FIGS. 3 to 6. Is. FIG. 5 is a cross-sectional view corresponding to FIG. 1 showing a display plate provided with a transparent protective plate arranged on the front surface of the transparent film. It is a figure by the photograph corresponding to FIG. 2 which shows the state of the reflected light of the display board of the modification 1 which formed the embossed pattern as fine unevenness on the front surface of the display board. It is a figure by the photograph corresponding to FIG. 2 which shows the state of the reflected light of the display board of the modification 2 which formed the sand pattern as a fine unevenness on the front surface of the display board.

Hereinafter, embodiments of a display board, a clock, a joint, and a method for manufacturing the display board according to the present invention will be described with reference to the drawings.

<Composition of display board>
FIG. 1 is a cross-sectional view showing the configuration of a display plate 100 according to an embodiment of the present invention, and FIG. 2 is an arrow A looking at the front surface 100a (transparent protective plate 90 side) of the display plate 100 shown in FIG. It is a figure by the photograph of an example which shows the state of the reflected light when viewed by.

The illustrated display board 100 is used, for example, as a dial of a wristwatch. This wristwatch is an embodiment of a timepiece according to the present invention. As the wristwatch, a so-called radio-controlled watch having a solar cell that receives light such as sunlight, that is, a watch with a solar cell, and having an antenna that receives standard time radio waves or radio waves from artificial satellites is applied. Therefore, the display plate 100 of the embodiment has light transmission and radio wave transmission.

The light transmittance of the display plate 100 may be such that the light transmittance is at least about 15 [%]. Further, the radio wave transmission may be such that it can receive the above-mentioned standard time radio wave and GPS radio wave. The display board of the present invention is not necessarily limited to that used for a clock with a solar cell or a radio clock.

As shown in FIG. 1, the display plate 100 is composed of a transparent film 10 and a reflective film 20 stacked in this order. The transparent film 10 and the reflective film 20 are joined by a transparent adhesive 30 interposed between them. As shown in FIG. 8 described later, the display plate 100 may include a transparent protective plate 90 arranged on the front surface 10a of the transparent film 10.

The transparent film 10 may be colorless and transparent, or may be colored and transparent. The transparent film 10 is formed to have a thickness of, for example, about 100 [μm]. The transparent film 10 has fine irregularities 11 formed on the front surface 10a, which is the surface opposite to the reflective film 20 (the surface facing the transparent protective plate 90).

The fine unevenness 11 includes, for example, a concentric pattern, a spiral pattern, a striped pattern, a radial pattern, a sandy pattern, a satin pattern, a stone-like pattern, a mesh pattern, a lattice pattern, a substantially pyramid-shaped repeating pattern, and an embossed pattern. It is formed with Asahi Kome or other geometric patterns. In the display plate 100 shown in FIG. 2, Asahi Metsuke is formed as fine irregularities 11.

The unevenness 11 is formed by, for example, thermal transfer. Therefore, the transparent film 10 is made of a material having heat resistance sufficient to form the fine irregularities 11 by thermal transfer.

The heat resistance of the transparent film 10 used for the display plate 100 of the timepiece is determined by, for example, performing a heat resistance test specified in JIS B7001: 2018, and swelling, cracking or deformation, discoloration, change in transparency, or other change in appearance. Must not occur.

Further, the heat resistant temperature must be such that thermal transfer is possible at a temperature higher than the temperature of the heat resistant test (50 [degrees] or 60 [degrees]) so that the contour of the fine unevenness 11 is not deformed by the heat resistant test. desirable. In particular, considering use in a high temperature environment such as in a car in summer, it is desirable that the heat resistant temperature is 80 [degrees] or more.

As the transparent film 10 having such heat resistance, for example, polycarbonate, polyamide, polysulfone, polyarylate, cycloolefin polymer or other engineering plastic can be applied.

The reflective film 20 is formed with a thickness of about several tens [μm] (for example, 50 [μm]). The reflective film 20 has a reflection characteristic in which the reflectance of light (visible light) is, for example, about 50 [%]. The reflective film 20 has, for example, a gloss (reflected light) that develops a silver color. As the reflective film 20, for example, a transmissive vapor deposition film, a film coated with a silver mirror, a reflective polarizing film, or another transmissive reflective film can be applied. Further, the transmissive reflective film preferably has a metallic luster.

The reflective film 20 used for the display plate 100 of the timepiece is subjected to, for example, a heat resistance test specified in JIS B7001: 2018, and blisters, cracks or deformations, discoloration, changes in transparency, and other changes in appearance are observed. It is desirable to have heat resistance that does not occur.

The transparent adhesive 30 may be a general adhesive or adhesive having light transmittance, and for example, a thermosetting adhesive, an ultraviolet curable adhesive or an adhesive can be applied.

In the display plate 100 configured as described above, the total thickness t1 of the transparent film 10, the transparent adhesive 30, and the reflective film 20 is formed to be, for example, about 150 [μm]. The total thickness t0 of the display plate 100 including the transparent protective plate 90 is, for example, about 500 to 650 [μm].

<Manufacturing method of display board>
FIGS. 3, 4, 5, 6 and 7 are schematic views showing each manufacturing process in an example of the manufacturing method of the display board 100, and FIG. 3 shows a transparent film 10 and a reflective film 20 via a transparent adhesive 30. A step of generating the integrated joint 40, FIG. 4 shows a step of arranging the joint 40 between the patterned jacket 210 and the holding plate 230, and FIG. 5 shows the hot press lower plate 310 and the hot press upper plate 320. A step of forming a pattern of fine irregularities 11 on the front surface 10a of the transparent film 10 by thermal transfer, and FIG. 6 shows a step of opening the pattern jacket 210 and the holding plate 230, respectively.

In FIG. 7, three joint members 45 (those having a size corresponding to the display plate 100) are formed on the joint 40 of one transparent film 10 and the reflective film 20 manufactured by the steps shown in FIGS. 3 to 6. It is a figure by a photograph which shows the state which was done.

FIG. 8 is a cross-sectional view corresponding to FIG. 1 showing an example of a display plate 100 provided with a transparent protective plate 90 arranged on the front surface 10a of the transparent film 10.

As an example, the display plate 100 is manufactured by the manufacturing process described below. The method for manufacturing the display board 100 by this manufacturing process is an embodiment of the method for manufacturing the display board according to the present invention. In this manufacturing method, first, as shown in FIG. 3, the transparent adhesive 30 is applied to the front surface 20a of the reflective film 20, and the transparent film 10 is applied to the front surface 20a to which the transparent adhesive 30 is applied. The back surface 10b (the surface opposite to the front surface 10a) is bonded.

As a result, a bonded body 40 in which the transparent film 10 and the reflective film 20 are integrated with each other via the transparent adhesive 30 is formed. The joint body 40 is an embodiment of the joint body according to the present invention, and the display plate 100 can be obtained.

The display plate 100 may not be coated with the transparent adhesive 30 on the front surface 20a of the reflective film 20, but may be coated with the transparent adhesive 30 on the back surface 10b of the transparent film 10.

Hereinafter, three display plates 100 will be manufactured from one joint 40 in which the transparent film 10 and the reflective film 20 are integrated, but the number of display plates 100 manufactured from one joint 40 will be described. The number is not limited to three, and may be one, two, or four or more.

Next, the process proceeds to a step of forming a pattern of fine irregularities 11 on the front surface 10a of the transparent film 10 by thermal transfer. Specifically, as shown in FIG. 4, the joint 40 is placed between the pattern jacket 210 and the holding plate 230 in which three pattern 220s having the contour pattern 221 in which the unevenness 11 is inverted are installed. To place.

At this time, the bonded body 40 is arranged so that the front surface 10a of the transparent film 10 faces the pattern 220.

Here, as shown in FIG. 5, the pattern jacket 210 is arranged on the heat press lower plate 310, and the holding plate 230 is arranged under the heat press upper plate 320. Then, the lower plate 310 of the hot press is moved upward, and the upper plate 320 of the hot press is moved downward, and the time continues from 1.0 to 2.0 [min] between the two at a temperature of, for example, 100 degrees Celsius. Then, a predetermined load is applied.

As a result, the pattern 221 of each pattern type 220 is pressed against the front surface 10a of the transparent film 10, and then, as shown in FIG. 6, the pattern type jacket 210 and the pressing plate 230 are opened. As a result, fine irregularities 11 obtained by reversing the pattern 221 are thermally transferred to the three regions partitioned by the alternate long and short dash lines (see FIG. 6) on the front surface 10a, and as shown in FIG. 7, the three joints are joined. The body member 45 is formed at the same time.

After that, each joint member 45 is punched out by a press into a predetermined contour shape corresponding to the display plate 100, and separated into three display plates 100. If necessary, a transparent protective plate 90 having substantially the same size as the display plate 100 may be arranged on the front surface 10a of the transparent film 10 of each display plate 100, as shown in FIG.

As the transparent protective plate 90, a flat plate such as a colorless transparent or colored transparent resin or glass can be applied. The transparent protective plate 90 is formed to have a thickness of, for example, about 300 to 500 [μm]. The transparent protective plate 90 is provided for protecting the fine unevenness 11 formed on the front surface 10a of the transparent film 10 described later, and it is not necessary to protect the fine unevenness 11. In some cases, it is not necessary to provide it, and it is not an essential component of the display board according to the present invention.

The transparent protective plate 90 may be placed in contact with the front surface 10a of the transparent film 10, but is supported by a support member other than the transparent film 10 (watch case (body), dial ring, etc.). If so, they may be separated from each other without touching the front surface 10a.

When the display plate 100 is provided with the transparent protective plate 90, the total thickness t0 of the display plate 100 including the transparent protective plate 90 is, for example, about 500 to 650 [μm].

<Action and effect of display board>
According to the display plate 100 configured as described above, although it is made of a non-metal material, the reflected light of metallic tone (for example, due to the unevenness 11 of Asahi light basis weight, the metallic tone called sunray (Reflected light) can be obtained. Therefore, it is possible to have light transmission and radio wave transmission that are difficult for a metal display board, and it is possible to realize a timepiece with a solar cell and a radio wave timepiece.

Further, since the display plate 100 can obtain metallic reflected light, it can be made to look like a metal display plate and can give a high-class feeling.

Moreover, since the display plate 100 does not directly form fine irregularities on the reflective film 20 but forms irregularities 11 on the transparent film 10, it is possible to prevent the characteristics of the reflective film 20 from being impaired by forming the irregularities. It can be suppressed.

That is, for example, when the reflective film 20 is a reflective polarizing film, the polarization characteristics are not impaired.

Further, when the thickness of the transparent film 10 is sufficiently thicker than the thickness of the reflective film 20, heat is prevented or suppressed from being transferred to the reflective film 20 when the fine irregularities 11 are formed by thermal transfer. can do. As a result, it is possible to prevent or suppress the characteristics of the reflective film 20 from being impaired by forming irregularities.

Since the reflective film 20 is a transmissive reflective film having a metallic luster, a high-class appearance such as that made of metal is obtained, and light is supplied to the solar cells arranged on the back surface of the display plate 100. be able to.

Further, when the reflective film 20 is a circularly polarizing film having light transmittance, the dividing line of the solar cell element of the solar cell is not visible through the display plate 100, and a more luxurious metallic appearance can be obtained. Can be done.

When the reflectance of the transmissive reflective film is high, the appearance is metallic and the solar cell is prevented from seeping through, but the amount of transmitted light is reduced and sufficient light cannot be supplied to the solar cell.

When the reflectance of the transmissive reflective film is low, the light supply to the solar cell is sufficient, but the solar cell and its dividing line are transparent to the visible side, and it becomes difficult to secure a metallic appearance.

Further, for example, when the transparent protective plate 90 is colored to make the display plate 100 colored, the transmittance is lowered by the coloring. However, if the light transmittance of the reflective film 20 is at least about 50 [%] (the light transmittance of the display plate 100 is at least about 15 [%]), even if such a decrease in the transmittance occurs. Sufficient light can be supplied to the solar cell.

The light transmittance can be obtained by, for example, the following method. That is, a solar cell is placed in a device that prevents outside light from entering, and light is incident on the solar cell from a white fluorescent lamp (light source) provided at a predetermined distance from the solar cell, and the solar cell is incident. Let A0 [A] be the current value when the optical energy generated by the light is converted into electrical energy. Next, a display plate having the same shape as this solar cell is placed on the solar cell, the current value measured in the same manner as above is defined as A1 [A], and the light transmittance is A1 [A] with respect to A0 [A]. It is calculated by the percentage of.

Further, since the reflective film 20 does not form fine irregularities, the reflective film 20 does not have to have heat resistance when the fine irregularities are formed by thermal transfer. That is, the display plate 100 gives the reflective film 20 a function of obtaining a metallic luster, and gives the transparent film 10 a function of converting the metallic luster into metallic reflected light by forming irregularities. Therefore, the functions can be divided between the reflective film 20 and the transparent film 10, and the range of selection of constituent elements can be expanded.

Further, according to the joint body 40 of the present embodiment, a plurality of display plates 100 can be obtained from one joint body 40.

Further, as shown in FIG. 8, the display plate 100 in which the transparent protective plate 90 is arranged on the side of the front surface 10a of the transparent film 10 is a case where the transparent protective plate 90 is in contact with the front surface 10a. Even if it is present or not in contact with the transparent film 10, it is possible to protect the fine unevenness 11 formed on the front surface 10a of the transparent film 10 from being scratched or deformed. it can.

Further, according to the manufacturing method of the display plate 100 of the present embodiment, the display plate 100 has the unevenness 11 formed on the transparent film 10 without forming fine irregularities on the reflective film 20 in a simple step. Can be manufactured.

If the reflective film 20 has a slightly yellowish color characteristic, the display plate 100 may look yellowish.

In that case, any of the following configurations (1) to (4) may be added to increase the reflected light of blue, which is the complementary color of yellow, so that the appearance of the display board 100 approaches white.

(1) Coloring the transparent film 10 in blue The transparent film 10 itself may be blended with a blue dye (pigment, dye, phosphor, etc.) to color the entire transparent film 10 in blue, or the transparent film 10 may be colored blue. The front surface 10a or the back surface 10b may be colored blue.

(2) Coloring the Reflective Film 20 in Blue The entire reflective film 20 may be colored blue by blending the reflective film 20 itself with a blue dye, or the front surface 20a or the back surface 20b of the reflective film 20 may be colored. May be colored blue.

(3) Color the transparent adhesive 30 in blue.

(4) Coloring the transparent protective plate 90 in blue The transparent protective plate 90 itself may be mixed with a blue pigment to color the entire transparent protective plate 90 in blue, or the front surface of the transparent protective plate 90. The 90a or the back surface 90b may be colored blue.

Even when the apparent color of the display board 100 is corrected to an arbitrary color, any one or more of the above methods (1) to (4) (the color to be colored in each method is corrected). (Change according to color) can be applied.

<Modification example 1>
FIG. 9 is a photograph corresponding to FIG. 2 showing the state of reflected light of the display plate 100 of Modification 1 in which an embossed pattern is formed as fine irregularities 11 on the front surface 10a of the transparent film 10.

According to the display board 100 configured in this way, the same actions and effects as those of the display board 100 of the above-described embodiment can be obtained. Further, although the display plate 100 is made of a non-metal material, it is possible to obtain metallic reflected light corresponding to the embossed pattern.

<Modification 2>
FIG. 10 is a photograph corresponding to FIG. 8 showing the state of reflected light of the display plate 100 of Modification 2 in which a sandy pattern is formed as fine irregularities 11 on the front surface 10a of the transparent film 10.

According to the display board 100 configured in this way, the same actions and effects as those of the display board 100 of the above-described embodiment can be obtained. Further, although the display plate 100 is made of a non-metal material, it is possible to obtain metallic reflected light corresponding to a sandy pattern.

The display plate 100 of the above-described embodiment or modification is applied to the dial of a wristwatch, but the display plate according to the present invention is not limited to that applied to the dial of a wristwatch, and is a table clock, a wall clock, or a pocket watch. It can be applied to the dials of various watches such as watches. It can also be applied to things other than watches.

10 Transparent film 10a Front surface 10b Back surface 11 Fine unevenness 20 Reflective film 30 Transparent adhesive 40 Joined body 100 Display plate

Claims (11)

With a transparent film
Reflective film and
A transparent adhesive that is interposed between the transparent film and the reflective film and that is integrated by joining the transparent film and the reflective film is provided.
A display plate in which fine irregularities are formed on the front surface of the transparent film opposite to the surface facing the reflective film. The display plate according to claim 1, wherein the transparent film has heat resistance capable of forming the unevenness by thermal transfer. The display plate according to claim 1 or 2, wherein the reflective film is a reflective polarizing film. The display plate according to claim 1 or 2, wherein the reflective film is a transflective reflective film. The display plate according to any one of claims 1 to 4, wherein at least one of the transparent film, the transparent adhesive, and the reflective film is colored. The display plate according to any one of claims 1 to 5, further comprising a transparent protective plate, which is arranged so as to face the surface of the transparent film on which the unevenness is formed. The display plate according to claim 6, wherein the transparent protective plate is colored. The display plate according to claim 6 or 7, wherein at least one of the transparent film, the transparent adhesive, and the transparent protective plate is colored with a complementary color of the color of the reflective film. A timepiece using the display board according to any one of claims 1 to 8 as a dial. With a transparent film
Reflective film and
A transparent adhesive that is interposed between the transparent film and the reflective film and that is integrated by joining the transparent film and the reflective film is provided.
Fine irregularities are formed on the front surface of the transparent film opposite to the surface facing the reflective film.
A joint from which a display board can be obtained. A transparent adhesive is interposed between the transparent film and the reflective film to integrally bond the transparent film and the reflective film.
A display in which fine irregularities are formed by thermal transfer on the surface of the transparent film opposite to the surface of the transparent film facing the reflective film with respect to the transparent film and the reflective film integrally bonded by the transparent adhesive. How to make a board.