JP6910312B2 - Display devices and in-vehicle information devices - Google Patents

Description

The present invention relates to a display device having a touch panel and an in-vehicle information device.

A conventional display device has a configuration in which a resin surface of a housing and a glass surface of a touch panel are adhered to each other by a single double-sided adhesive tape (see, for example, Patent Document 1). The adhesive strength of the double-sided adhesive tape differs depending on the mating member to be adhered, and the glass constituting the touch panel has about twice the adhesive strength of the resin constituting the housing. Therefore, when the housing and the touch panel are bonded to each other with the double-sided adhesive tape, the double-sided adhesive tape remains on the glass surface of the touch panel when the touch panel is peeled off from the housing.

If the housing is scratched, the double-sided adhesive tape will remain on the touch panel side even if the touch panel is peeled off from the housing and reused. Attempting to remove the double-sided adhesive tape from the touch panel may damage the touch panel. In that case, it is necessary not only to replace the housing but also to replace the expensive touch panel.

Alternatively, there is a method in which two types of double-sided adhesive tapes having different adhesive strengths are laminated and used. In this method, of the double-sided adhesive tapes bonded in two layers, the double-sided adhesive tape having a weak adhesive force is adhered to the glass surface of the touch panel, and the double-sided adhesive tape having a strong adhesive force is adhered to the resin surface of the housing. .. When the touch panel is peeled off from the housing, the double-sided adhesive tape stuck in two layers remains on the resin surface of the housing.

Japanese Unexamined Patent Publication No. 2010-262199

When the housing and the touch panel are adhered to each other by a single double-sided adhesive tape as in the conventional case, if the housing is damaged, it is necessary to replace the entire touch panel, which causes a problem of unnecessary cost.

Further, when the housing and the touch panel are adhered to each other by the double-sided adhesive tape bonded in two layers, there is a problem that the cost of the double-sided adhesive tape is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to leave a double-sided adhesive tape on the housing side when the touch panel is peeled off from the housing without increasing the cost.

Display device according to the present invention includes a touch panel having a flat glass surface, comprising a housing having a resin surface on which uneven portions are formed, and a double-sided adhesive tape for bonding the glass surface and the resin surface, the resin surface When the end face of the housing on which the touch panel is attached is the front end face, the surface formed at a position on the back side by a predetermined length from the front end face and adheres to the resin surface of the double-sided adhesive tape is adhered to the entire surface of the uneven portion, the surface to be adhered to the glass surface is a concavo-convex shape along the contour of the concave-convex portion, the flat surface formed on the side that adheres to the glass surface of the convex portion of the concavo-convex shape of the glass The inclination angle of the side wall which is adhered to the surface and is formed linearly from the convex portion to the concave portion in the concave-convex portion is 14 degrees or more and 45 degrees or less with respect to the bottom surface of the concave portion .

According to the present invention, the surface of the double-sided adhesive tape that adheres to the resin surface adheres to the entire surface of the concavo-convex portion, and the surface that adheres to the glass surface has a concavo-convex shape that follows the contour of the concavo-convex portion. Is made to adhere to the glass surface, so that the adhesive area of the glass surface, which has a strong adhesive force with the double-sided adhesive tape, is reduced. As a result, the double-sided adhesive tape can be left on the housing side when the touch panel is peeled off from the housing without increasing the cost.

It is an exploded perspective view which shows the structural example of the main part in the display device which concerns on Embodiment 1. FIG. It is a front view which shows the structural example of the housing in the display device which concerns on Embodiment 1. FIG. FIG. 5 is a cross-sectional view of the display device according to the first embodiment cut along the line AA shown in FIG. FIG. 3 is an enlarged cross-sectional view of region B in FIG. It is a front view which shows an example of the concavo-convex portion formed on the resin surface of the housing in Embodiment 1. FIG.

Embodiment 1.
FIG. 1 is an exploded perspective view showing a configuration example of a main part of the display device according to the first embodiment. The display device according to the first embodiment includes a touch panel 10, a housing 20, a double-sided adhesive tape 30, a liquid crystal display (not shown), and the like.

FIG. 2 is a front view showing a configuration example of the housing 20 in the display device according to the first embodiment. FIG. 3 is a cross-sectional view of the display device according to the first embodiment cut along the line AA shown in FIG. The touch panel 10 has a flat glass surface 11. The housing 20 has a resin surface 21. In the example of FIG. 2, an opening is formed in the center of the housing 20, and four resin surfaces 21 shown as shaded areas are formed on the peripheral edge of the opening. The double-sided adhesive tape 30 adheres to the glass surface 11 of the touch panel 10 and the resin surface 21 of the housing 20. The touch panel 10 is held in the housing 20 by the adhesive force of the double-sided adhesive tape 30.

FIG. 4 is an enlarged cross-sectional view of region B of FIG. FIG. 5 is a front view showing an example of the uneven portion 22 formed on the resin surface 21 of the housing 20 according to the first embodiment. The uneven portion 22 of the resin surface 21 has a convex portion 23, a concave portion 24, and a side wall 25 extending from the convex portion 23 to the concave portion 24. When the resin-side adhesive surface 32 of the double-sided adhesive tape 30 is adhered to the resin surface 21 of the housing 20, it becomes familiar with the uneven portion 22 of the resin surface 21. As a result, the resin-side adhesive surface 32 adheres to the entire surface of the uneven portion 22, and the glass-side adhesive surface 31 on the opposite side has an uneven shape along the contour of the uneven portion 22. When the glass surface 11 of the touch panel 10 is adhered to the concavo-convex glass-side adhesive surface 31, the concavo-convex convex portion 33 on the glass-side adhesive surface 31 is adhered to the glass surface 11. On the other hand, there is a gap between the concave-convex concave portion 34 on the glass-side adhesive surface 31 and the glass surface 11.

In the state shown in FIG. 4, the adhesive area between the resin surface 21 of the housing 20 and the double-sided adhesive tape 30 is larger than the adhesive area between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30. As a result, the adhesive strength between the resin surface 21 of the housing 20 and the double-sided adhesive tape 30 is stronger than the adhesive strength between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30. Therefore, when the touch panel 10 is peeled off from the housing 20, the double-sided adhesive tape 30 is peeled off from the glass surface 11 of the touch panel 10 having a relatively weak adhesive force, and remains on the resin surface 21 of the housing 20 having a relatively strong adhesive force. .. Therefore, when the housing 20 is scratched, the housing 20 may be peeled off from the touch panel 10 and replaced, and the touch panel 10 can be reused, so that no wasteful cost is incurred.

The resin surface 21 of the housing 20 is made of, for example, PC + ABS (polycarbonate-acrylonitrile-butadiene-styrene mixed) resin, or is coated on PC + ABS resin. The double-sided adhesive tape 30 is made of, for example, acrylic. The material constituting the double-sided adhesive tape 30 is not limited to acrylic, and may be any material as long as the uneven shape of the adhesive surface 31 on the glass side is not crushed even if it is compressed when the touch panel 10 and the housing 20 are bonded. Since the double-sided adhesive tape 30 is one sheet, the cost is lower than that of the double-sided adhesive tape which is laminated in two layers as described above.

By changing the dimensions of the uneven portion 22, the adhesive force between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30 and the adhesive force between the resin surface 21 of the housing 20 and the double-sided adhesive tape 30 can be adjusted. It is possible.

Here, an example of the dimensions of the uneven portion 22 will be described with reference to FIG.
In FIG. 4, the resin surface 21 is a horizontal plane, that is, the left-right direction of the paper surface is a horizontal direction. Further, the adhesive force per unit area between the double-sided adhesive tape 30 and the glass surface 11 is about twice as strong as the adhesive force per unit area between the double-sided adhesive tape 30 and the resin surface 21. In this example, the horizontal distance a of the side wall 25 is about 0.05 mm to 0.2 mm. The horizontal distance b of the recess 24 is 0.5 mm to 1 mm. The inclination angle c of the side wall 25 is 45 degrees or less with respect to the bottom surface of the recess 24. The height difference d of the uneven portion 22 is 0.05 mm to 0.1 mm. The horizontal distance b of the concave portion 24 is equal to or greater than the horizontal distance e of the convex portion 23. That is, b ≧ e. The thickness f of the double-sided adhesive tape 30 is 0.4 mm.

As described above, by setting b ≧ e, the adhesive area between the resin surface 21 of the housing 20 and the double-sided adhesive tape 30 is compared with the adhesive area between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30. Is definitely bigger. Therefore, even if there is a difference of nearly twice in the adhesive force per unit area between the glass surface 11 and the resin surface 21, the housing 20 is compared with the adhesive force between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30. The adhesive strength between the resin surface 21 and the double-sided adhesive tape 30 is definitely stronger.

Further, by setting a <b, even if the double-sided adhesive tape 30 and the resin surface 21 of the housing 20 are not partially adhered, the housing is provided by the area of the horizontal distance b of the recess 24. The adhesive area between the resin surface 21 of 20 and the double-sided adhesive tape 30 is surely increased. Therefore, the adhesive strength between the resin surface 21 of the housing 20 and the double-sided adhesive tape 30 is definitely stronger than the adhesive strength between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30. The portion of the double-sided adhesive tape 30 that is difficult to adhere to the resin surface 21 is, for example, a corner portion extending from the side wall 25 to the recess 24.

On the other hand, in the double-sided adhesive tape that is laminated in two layers as described above, there are few variations of the double-sided adhesive tape that is bonded. Therefore, the adhesive strength of the double-sided adhesive tape adhered to the glass surface 11 and the adhesive strength of the double-sided adhesive tape adhered to the resin surface 21 could not be finely adjusted.

Since the housing 20 is made of resin, the coefficient of linear expansion is larger than that of the glass touch panel 10. Therefore, when the display device according to the first embodiment is used as an in-vehicle information device such as a car navigation device, the housing 20 expands and contracts at a thermal shock of about −40 ° C. to 85 ° C., which is peculiar to the in-vehicle environment. As the housing 20 expands and contracts, a force in the shearing direction, which is indicated by an arrow in FIG. 4, acts on the double-sided adhesive tape 30. Then, the double-sided adhesive tape 30 is displaced with respect to the housing 20 in the shearing direction. In the first embodiment, the side wall 25 suppresses the displacement of the double-sided adhesive tape 30 in the shearing direction. When the inclination angle c of the side wall 25 is large, it becomes difficult for the double-sided adhesive tape 30 to adhere to the corner portion from the side wall 25 to the recess 24, and a gap is likely to be formed in this corner portion. Therefore, in the first embodiment, the inclination angle c of the side wall 25 is set to 45 degrees or less so that a gap is not formed while suppressing the deviation of the double-sided adhesive tape 30 in the shearing direction. Further, the inclination angle c of the side wall 25 is set to 14 degrees or more with respect to the bottom surface of the recess 24. The lower limit value of 14 degrees for the inclination angle c is defined by the horizontal distance a of the side wall 25 and the height difference d of the uneven portion 22.

As described above, the display device according to the first embodiment includes a touch panel 10 having a flat glass surface 11, a housing 20 having a resin surface 21 on which an uneven portion 22 is formed, and a glass surface 11 and a resin surface 21. A double-sided adhesive tape 30 for adhering to and is provided. The resin-side adhesive surface 32 that adheres to the resin surface 21 of the double-sided adhesive tape 30 adheres to the entire surface of the uneven portion 22. The glass-side adhesive surface 31 that adheres to the glass surface 11 of the double-sided adhesive tape 30 has a concavo-convex shape along the contour of the concavo-convex portion 22, and the convex portion 33 of the concavo-convex shape adheres to the glass surface 11. As a result, the adhesive area of the glass surface 11 having a strong adhesive force with the double-sided adhesive tape 30 is reduced. Therefore, the display device can leave the double-sided adhesive tape 30 on the housing 20 side when the touch panel 10 is peeled off from the housing 20 without increasing the cost.

Further, the inclination angle c of the side wall 25 from the convex portion 23 to the concave portion 24 in the concave-convex portion 22 of the first embodiment is 45 degrees or less with respect to the bottom surface of the concave portion 24. As a result, the display device can suppress the displacement of the double-sided adhesive tape 30 in the shearing direction at the time of thermal shock. Therefore, the adhesion between the housing 20 and the double-sided adhesive tape 30 is improved, and a strong adhesive force is maintained. Further, the display device is suitable as a display device used in an in-vehicle information device such as a car navigation device.

Further, the horizontal distance b of the concave portion 24 in the concave-convex portion 22 of the first embodiment is equal to or greater than the horizontal distance e of the convex portion 23. As a result, the adhesive area between the resin surface 21 of the housing 20 and the double-sided adhesive tape 30 is surely larger than the adhesive area between the glass surface 11 of the touch panel 10 and the double-sided adhesive tape 30.

In the present invention, it is possible to modify any component of the embodiment or omit any component of the embodiment within the scope of the invention.

10 Touch panel, 11 Glass surface, 20 Housing, 21 Resin surface, 22 Concavo-convex part, 23 Convex part, 24 Concave, 25 Side wall, 30 Double-sided adhesive tape, 31 Glass side adhesive surface, 32 Resin side adhesive surface, 33 Concavo-convex shape Convex part, 34 Concavo-convex concave part, a Horizontal distance of side wall, b Horizontal distance of concave part, c Inclined angle of side wall, d Height difference of uneven part, e Horizontal distance of convex part, f Both sides Adhesive tape thickness.

Claims (3)

A touch panel with a flat glass surface and
A housing with a resin surface on which uneven parts are formed, and
A double-sided adhesive tape for adhering the glass surface and the resin surface is provided.
The resin surface is formed at a position on the back side by a predetermined length from the end surface on the front side when the end surface on the side of the housing on which the touch panel is attached is the end surface on the front side.
The surface to be adhered to the resin surface in the double-sided adhesive tape adhered to the entire surface of the uneven portion, the surface to be bonded to the glass surface is a concavo-convex shape along the contour of the concave-convex portion, the convex portion of the concavo-convex shape Of these, the flat surface formed on the side to be adhered to the glass surface is adhered to the glass surface .
A display device characterized in that the inclination angle of a side wall formed linearly from a convex portion to a concave portion in the concave-convex portion is 14 degrees or more and 45 degrees or less with respect to the bottom surface of the concave portion. The display device according to claim 1, wherein when the resin surface is a horizontal plane, the horizontal distance of the concave portion in the concave-convex portion is equal to or larger than the horizontal distance of the flat surface of the convex portion. An in-vehicle information device including the display device according to claim 1 or 2.

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