JP7155875B2 - electronic device - Google Patents

Description

The present invention relates to an electronic device such as an in-vehicle display device mounted in an automobile or the like.

In an electronic device, for example, a display device for vehicle such as a center display, a liquid crystal display panel is provided in a synthetic resin housing (housing), and the surface (front) side of the liquid crystal display panel is made of transparent synthetic resin. (see, for example, Patent Document 1). At this time, a flange that covers the peripheral edge of the protective member is provided on the front surface of the housing, and a cushioning member such as silicon rubber is provided between the flange and the peripheral edge of the protective member to provide waterproof and dustproof performance. is designed.

JP 2015-148694 A

By the way, in recent years, in the display device as described above, it has been considered to make the overlay made of glass in order to improve the appearance. In addition, the front panel has ribs that protrude toward the front side along the entire outer periphery of the overlay so that the gap between the overlay and the overlay is minimized and the entire surface is flat with little unevenness (flush surface). are integrally provided. In this case, the front panel is made of synthetic resin in order to meet design requirements or for cost reasons.

However, if the overlay is made of glass, the coefficient of linear expansion is significantly different from that of the front panel made of synthetic resin. The stress concentrates on the rib portion arranged on the outer periphery of the overlay, and may lead to deformation or breakage of the rib (or overlay) and breakage of the glass itself due to stress concentration on the glass. In particular, when used in an environment with large temperature fluctuations, such as on-vehicle use, it is necessary to take measures to alleviate the stress concentration on the ribs.

The present invention has been made in view of the above circumstances, and its object is to prevent deformation and damage of the ribs due to thermal expansion and contraction in a front panel integrally having ribs arranged on the outer periphery of the overlay. to provide an electronic device capable of

To achieve the above object, the electronic device (1) of the present invention comprises a front panel (3, 11) forming a front outer shell of an electronic device body (2), and a surface of the electronic device body (2). The front panel (3, 11) integrally includes ribs (7, 14) arranged on the outer periphery of the overlay (4). and the front panel (3, 11) is provided with a stress relaxation structure (9, 15) for relieving stress on the ribs (7, 14) , the stress relaxation structure comprising: It is constructed by providing a concave groove for facilitating elastic deformation at the base of the rib, and the concave groove is provided so as to deform the front panel side by the stress acting on the rib . .

According to this, by integrally having ribs arranged on the outer periphery of the overlay on the front panel, it is possible to improve the appearance and meet the needs of minimizing the gap between the overlay and the overlay. Even if there is a difference in coefficient of linear expansion between the front panel and the overlay, the stress on the ribs is relieved by the stress relaxation structure provided on the front panel. Therefore, in an electronic device in which ribs are integrally arranged on the outer periphery of the overlay on the front panel, it is possible to obtain an excellent effect of preventing deformation and breakage of the ribs and glass due to thermal expansion and contraction. can.

1 shows a first embodiment, and is a transverse cross-sectional view of a main part of an in-vehicle display device; Perspective view of in-vehicle display device Exploded perspective view of front panel and overlay 2 shows a second embodiment, and is a transverse cross-sectional view of a main part of an in-vehicle display device.

A first embodiment applied to a center display of an automobile as an in-vehicle display device will be described below with reference to FIGS. 1 to 3. FIG. FIG. 2 shows an exterior configuration of an in-vehicle display device (center display) 1 as an electronic device, which is provided, for example, in the central portion of an instrument panel in a vehicle compartment. The in-vehicle display device 1 has a large display screen, which includes a map screen for car navigation, operation screens for in-vehicle equipment such as car air conditioners and car audio systems, various setting screens and message screens, TV and DVD screens. etc., and images captured by the in-vehicle camera are displayed.

The in-vehicle display device 1 as a whole is configured in a substantially rectangular shape that is thin in the front-rear direction (thickness direction) and horizontally long. Specifically, as shown in FIGS. 1 and 3, the vehicle-mounted display device 1 includes a liquid crystal display panel 2 (shown only in FIG. 1) as an electronic device main body, and a front peripheral portion of the liquid crystal display panel 2. It has a front panel 3 arranged in a frame shape forming an outer shell and an overlay 4 for decoration arranged on the front surface of the front panel 3. - 特許庁The overlay 4 is made of glass in this case, and is configured in the shape of a horizontally long rectangular plate. A rear frame (not shown) is arranged on the rear side of the in-vehicle display device 1 .

The front panel 3 is made of synthetic resin such as polycarbonate (PC) and ABS resin. ing. Among them, the outer peripheral wall portion 5 is formed in the shape of a horizontally elongated rectangular frame that is thin in the front and rear directions and is positioned so as to surround the outer periphery of the liquid crystal display panel 2 . As shown in FIG. 1, the front receiving piece portion 6 is provided so as to extend inward from the inner wall portion of the outer peripheral wall portion 5 to receive the outer peripheral portion of the overlay 4 on the back side. . At this time, the overlay 4 is adhered with an adhesive member 8 such as a double-faced tape, with the outer peripheral portion of the rear surface of the overlay 4 being applied to the front surface of the front receiving piece portion 6 .

The rib 7 is provided along the outer peripheral edge of the overlay 4 so as to protrude forward from the front receiving piece portion 6 so that the inner surface of the rib 7 contacts the outer peripheral edge of the overlay 4 . In this case, the protrusion dimension of the rib 7 is set to a dimension that protrudes forward from the overlay 4 by a slight amount in order to achieve a flush surface. The liquid crystal display panel 2 is arranged in an opening formed inside the front receiving piece portion 6 so that the screen thereof can be viewed from the front.

Now, in this embodiment, the front panel 3 is provided with a stress relaxation structure for relaxing the stress on the ribs 7 . Specifically, as shown in FIG. 1, the stress relaxation structure is provided at the base of the rib 7 of the front panel 3, that is, at the boundary between the rib 7 and the front receiving piece 6 to facilitate elastic deformation. It is configured by providing a recessed groove portion 9 of . The recessed groove portion 9 is recessed toward the rear side when viewed from the front, and is formed to have a relatively shallow U-shaped cross section. At this time, the groove width of the concave groove portion 9 expands on the front panel 3 side, that is, on the front receiving piece portion 6 side with respect to the rib 7 due to the stress acting on the rib 7 (relative stress acting in the direction of the arrow A). It is provided so as to elastically deform in the direction.

Next, functions and effects of the in-vehicle display device 1 configured as described above will be described. In the above configuration, the appearance can be improved by making the overlay 4 made of glass. Further, the front panel 3 is integrally provided with a rib 7 protruding toward the front side along the entire outer periphery of the overlay 4 . The gap between the front panel 3 and the overlay 4 is made as small as possible, and the entire front surface is made flat (flush surface) with little unevenness. At this time, since the front panel 3 is made of synthetic resin, it is possible to meet design requirements and to keep costs low.

Here, since the front panel 3 is made of synthetic resin and the overlay 4 is made of glass, there is a difference in coefficient of linear expansion between the two. works. In particular, since the in-vehicle display device 1 is used in an environment with large temperature changes, for example, during thermal contraction due to a temperature drop, relative to the rib 7 in the direction indicated by the arrow A in FIG. stress acts. As a result, the rib 7 or the overlay 4 may be deformed or damaged.

However, in this embodiment, the stress on the ribs 7 is relieved by the stress relaxation structure provided on the front panel 3 . Specifically, by providing a concave groove portion 9 for facilitating elastic deformation at the root portion of the rib 7, that is, at the boundary portion with the front receiving piece portion 6, the rib 7 is relatively stressed in the direction of the arrow A. is applied, the groove width of the concave groove portion 9 is elastically deformed in the direction of widening, and the stress is absorbed. Incidentally, according to the results of analysis conducted by the present inventors, in the case of the conventional structure (the front receiving piece has a flat shape) that does not have the concave groove 9, the stress concentrates at the base of the rib, and the maximum stress is It becomes about 40 MPa. On the other hand, in the structure of this embodiment, the stress was dispersed over a wide range, and the maximum stress was about 26 MPa, which could be reduced to 2/3.

As described above, according to this embodiment, even if there is a difference in coefficient of linear expansion between the front panel 3 and the overlay 4, the stress on the ribs 7 is relieved by the stress relaxation structure provided on the front panel 3. It will be done. As a result, by integrally providing the ribs 7 arranged on the outer periphery of the overlay 4 in the front panel 3, the appearance is improved and the gap between the overlay 4 and the need to be minimized can be met. , the deformation and breakage of the ribs 7 due to thermal expansion and contraction can be prevented.

In particular, in this embodiment, as the stress relaxation structure, the recessed grooves 9 for facilitating elastic deformation are provided at the roots of the ribs 7. Therefore, the desired stress relaxation structure can be provided with a simple and inexpensive structure. be able to. In addition, in this embodiment, the front panel 3 is made of synthetic resin and the overlay 4 is made of glass. Therefore, the merits of the design and cost of the front panel 3 can be ensured, and the appearance of the overlay 4 is improved. can be improved.

FIG. 4 shows a second embodiment, which differs from the first embodiment in the configuration of the front panel 11. As shown in FIG. That is, in the second embodiment as well, the front panel 11 is made of synthetic resin, and includes an outer peripheral wall portion 12 , a front receiving piece portion 13 made of glass for receiving the overlay 4 , and an outer peripheral edge portion of the overlay 4 . It is configured by integrally having ribs 14 in contact with each other. The front panel 11 is provided with a stress relief structure that relieves stress on the ribs 14 .

The stress relaxation structure is constructed by providing a recessed groove portion 15 for facilitating elastic deformation at the root portion of the rib 14 of the front panel 11, that is, at the boundary portion between the rib 14 and the front receiving piece portion 13. . At this time, in this embodiment, the concave groove portion 15 is formed so as to be sufficiently deep as compared with the concave groove portion 9 of the first embodiment. As a result, the concave groove portion 15 elastically deforms the rib 14 itself outward with respect to the front panel 11 when a stress acts relatively on the rib 14 in the direction of the arrow A.

According to the second embodiment, the front panel 11 is integrally provided with the ribs 14 arranged on the outer periphery of the overlay 4, and the front panel 11 is provided with a stress relaxation structure for relaxing the stress on the ribs 14. Thus, like the first embodiment, it is possible to obtain an excellent effect of preventing deformation and breakage of the ribs due to thermal expansion and contraction while improving the appearance. In addition, since the grooves 15 for facilitating elastic deformation are provided at the roots of the ribs 14 as the stress relaxation structure, the desired stress relaxation structure can be provided with a simple and inexpensive structure.

In the above-described embodiment, the present invention is applied to a vehicle center display, but is not limited to this, and can be applied to, for example, display devices for various purposes, and electronic devices in general provided with an overlay. The overlay may be made of synthetic resin instead of glass, and the front panel may be made of metal instead of synthetic resin. That is, the front panel and overlay can be constructed from a variety of materials. Instead of having recessed grooves, the roots of the ribs can be partially thinned or constructed from a different material. A stress relaxation structure may be provided by

In addition, various changes are possible for the shape of the front panel and ribs. Although the present disclosure has been described with reference to examples, it is understood that the present disclosure is not limited to such examples or structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and configurations, as well as other combinations and configurations, including single elements, more, or less, are within the scope and spirit of this disclosure.

In the drawings, 1 is a vehicle-mounted display device (electronic device), 2 is a liquid crystal display panel (electronic device main body), 3 and 11 are front panels, 4 is an overlay, 5 and 12 are outer peripheral wall portions, and 6 and 13 are front surfaces. Receiving pieces, 7 and 14 are ribs, and 9 and 15 are concave grooves (stress relaxation structures).

Claims (3)

An electronic device ( 1) and
The front panel (3, 11) integrally has ribs (7, 14) arranged on the outer periphery of the overlay (4),
The front panel (3, 11) is provided with stress relief structures (9, 15) for relieving stress on the ribs (7, 14) and stress on the overlay (4) ,
The stress relaxation structure is configured by providing a concave groove portion for facilitating elastic deformation at the root portion of the rib, and
The electronic device according to claim 1, wherein the concave groove portion is provided so as to deform the front panel side by stress acting on the rib . 2. The electronic device according to claim 1, wherein said front panel is made of synthetic resin and said overlay is made of glass. 3. The electronic device according to claim 1, wherein the electronic device main body comprises a vehicle-mounted display device.

Images