JP2008187110A - Installation structure of surface panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to the display function of a surface panel by preventing the surface panel from being lifted by changes in used equipment and fluctuations in ambient temperature in an installation structure of the surface panel. <P>SOLUTION: A first stud 5 and three second studs 6 are protruded on the four corners of a recessed part 2a of an upper case 2. On the four corners of a surface panel 3 installed on the recessed part 2a, a first fit hole 13 fit onto the first stud 5 and second fit holes 14 fit onto the second studs 6 are provided. The height of protrusion of the second stud 6 from the recessed part 2a is larger than the thickness of the surface panel 3. The diameter of the second fit hole 14 is larger than that of the second stud 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mounting structure for a surface panel formed on a surface of an electronic device or the like and formed of a transparent material.

As a conventional surface panel mounting structure, it is formed of a housing provided with a display sheet placement surface on which the display sheet is placed, and a transparent material for pressing the display sheet on the display sheet placement surface. A front panel, and a projection provided on the display sheet mounting surface is fitted into a long groove provided on one end of the display sheet mounting surface, and the front panel is engaged with a mounting hole provided on the other end of the display sheet mounting surface. There is one that attaches the front panel to the display sheet placement surface by engaging the pieces (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-142782 (paragraph [0008], FIG. 1)

  In the conventional surface panel mounting structure described above, the projection sheet is fitted into the long groove and the engaging piece is engaged with the mounting hole, so that the surface panel is attached to the display sheet mounting surface. If the surface panel is attached to the mounting surface with play in the plane direction, the engaging piece may come off the engaging hole, and the surface panel may fall off the display sheet mounting surface. Therefore, the front panel is attached to the display sheet placement surface without play in the plane direction. For this reason, when an electrical component or the like that generates heat is mounted in the housing, when the surface panel is thermally expanded by the generated heat, the housing and the surface panel are formed of materials having different thermal expansion coefficients. The front panel may be partially lifted from the display sheet placement surface and bent. When the front panel is partially bent, there is a problem in that characters, designs, and the like described on the display sheet are visually distorted and the display function of the front panel is impaired.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to prevent the surface panel from being lifted with respect to changes in the temperature of the device casing and the surroundings and to impair the display function of the surface panel. The present invention provides a mounting structure for a surface panel that has nothing to do.

  In order to achieve this object, the invention according to claim 1 is a fitting formed by a housing having a plurality of studs projecting on the surface thereof, and a transparent member having a different coefficient of thermal expansion from the housing, and fitting into the stud. In the mounting structure of the surface panel, comprising: a surface panel having a joint hole; and a fastening member that is screwed to the stud and restricts the removal of the surface panel from the stud by a head portion. And a plurality of second fitting holes that are loosely fitted with play on the stud, and the second fitting holes are fitted with the first fitting holes. The protruding height of the stud is formed larger than the thickness of the surface panel.

  The invention according to claim 2 is the invention according to claim 1, wherein the second fitting hole is covered by the fastening member fastened to the stud fitted into the second fitting hole.

  According to the first aspect of the present invention, even if the surface panel expands or contracts due to a temperature change in or around the apparatus housing, the surface panel is within the range of play between the plurality of second fitting holes and the stud. Therefore, the surface panel does not lift from the housing. For this reason, since the surface panel does not bend partially, the display function of the surface panel is not impaired.

  According to the second aspect of the invention, since the second fitting hole cannot be viewed from the outside by covering the second fitting hole with the fastening member, the fitting hole is intentionally inserted by a third party. No foreign matter is inserted into the enclosure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view of an electronic device in which the structure for attaching a front panel according to the present invention is implemented, FIG. 2 is a perspective view of the electronic device, FIG. 3 is an exploded perspective view of the electronic device, and FIG. FIG. 5 is an enlarged view of a V portion in FIG. 1, FIG. 6 is an enlarged view of a VI portion in FIG. 4, and FIG. 7 is an enlarged view of a VII portion in FIG.

  3 and FIG. 4, an electronic device generally indicated by reference numeral 1 forms an upper case 2 formed in a shallow bottom shape by ABS constituting a part of the case of the electronic device 1, and the upper case 2 together with the upper case 2. A lower case (not shown), a front panel 3 attached to the surface of the upper case 2 and formed of a transparent acrylic plate, and a printed wiring board 4 attached to the back side of the upper case 2 via a stud are generally used. It is configured.

  As shown in FIG. 3, a flat surface 2a having a rectangular shape in front view is formed on the front surface of the upper case 2, and each of the four corners of the surface 2a has one first stud 5 and three pieces. The second stud 6 protrudes integrally. The protrusion height H1 from the surface 2a of the first stud 5 is formed slightly higher than the thickness t of the surface panel 3 as shown in FIG. On the other hand, the protrusion height H2 from the surface 2a of the second stud 6 is formed larger than the thickness t of the surface panel 3 as shown in FIG. . In FIG. 3, reference numerals 8 and 9 denote various function buttons and dial buttons mounted on the inner surface 2a of the upper case 2, and when pressed, the printed wiring board is connected via the rubber sheet 12 shown in FIG. 4 Close the contacts printed on (not shown).

  In each of the four corners of the front panel 3, as shown in FIG. 3, one first fitting hole 13 into which the above-described first stud 5 is fitted and three above-mentioned second studs 6 are loosely fitted. Pieces of second fitting holes 14 are provided. The diameter d1 of the first fitting hole 13 is slightly larger than the diameter D1 of the first stud 5 as shown in FIG. On the other hand, the diameter d2 of the second fitting hole 14 is formed larger than the diameter D1 of the second stud 6 as shown in FIG.

  6 and 7, reference numeral 15 denotes a hexagon socket head cap screw as a fastening member screwed to the first and second studs 5 and 6, and the head 15a includes a second bolt as shown in FIG. The flange 15b formed in the diameter D2 larger than the diameter d2 of the fitting hole 14 is provided. 6 and 7, reference numeral 16 denotes a cylindrical screw member fitted in the center holes 5a and 6a provided in the first and second studs 5 and 6, and a screw portion provided in the inner peripheral portion. The hexagon socket head cap screw 15 is screwed.

  Next, in the surface panel mounting structure configured as described above, a method of mounting the surface panel will be described. As shown in FIG. 3, the first fitting hole 13 of the front panel 3 is fitted to the first stud 5 of the upper case 2, and the second fitting hole 14 is fitted to the second stud 6. The front panel 3 is fitted to the surface 2 a of the upper case 2. In this state, each of the function button 8 and the dial button 9 protrudes from the holes 10 and 11 of the front panel 3 as shown in FIG.

  Next, each of the four hexagon socket head bolts 15 inserted through the first and second fitting holes 13 and 14 of the front panel 3 is replaced with one first stud of the upper case 2 as shown in FIG. The front panel 3 is attached to the surface 2 a of the upper case 2 by being screwed to the screw 16 of 5 and the screws 16 of the three second studs 6.

  As described above, the protrusion height H1 from the surface 2a of the first stud 5 is formed slightly larger than the thickness t of the surface panel 3 as shown in FIG. d1 is formed slightly larger than the diameter D1 of the first stud 5. Accordingly, one corner 3a of the surface panel 3 is attached to the surface 2a of the upper case 2 in a state where sliding in the X-axis direction, the Y-axis direction, and the Z-axis direction in FIG.

  On the other hand, the protrusion height H2 from the surface 2a of the three second studs 6 is formed larger than the thickness t of the surface panel 3 as shown in FIG. 7, and the three second fitting holes 14 are formed. The diameter d2 of the second stud 6 is formed larger than the diameter D1 of the second stud 6. Therefore, the other three even numbers 3b, 3c, 3d of the front panel 3 are different in the X axis direction and the Y axis direction between the diameter d2 of the second fitting hole 14 and the diameter D1 of the second stud 6 (d2− D1) The play is provided by the amount, and it is attached to the surface 2a of the upper case 2 in a movable state. Further, the gaps 3b, 3c, and 3d have gaps corresponding to the difference (H2−t) between the protrusion height H2 of the second stud 6 from the surface 2a and the thickness t of the surface panel 3 in the Z-axis direction. It is attached to the surface 2a of the upper case 2 in the provided state.

  Accordingly, the upper case 2 formed of ABS and the surface panel 3 formed of an acrylic plate having a different thermal expansion coefficient from the ABS expand and contract differently with respect to temperature changes in and around the upper case 2, Since the triplet 3b, 3c, 3d of the surface panel 3 can slide in the X-axis direction and the Y-axis direction, the surface panel 3 does not float from the surface 2a of the upper case 2. For this reason, since the surface panel 3 does not bend partially, characters or symbols attached to the surface 2a of the upper case 2 are not visually observed in a distorted state. There is no loss of functionality.

  Further, the triplet 3b, 3c, 3d of the surface panel 3 is the difference (H2-t) between the protrusion height H2 of the second stud 6 from the surface 2a and the thickness t of the surface panel 3 in the Z-axis direction. Since only the gap is provided, the sliding of the triplet 3b, 3c, 3d in the X-axis direction and the Y-axis direction is performed smoothly.

  Further, the head 15a of the hexagon socket head cap bolt is provided with a flange 15b formed to have a diameter D2 larger than the diameter d2 of the second fitting hole 14, so that the second from the front of the front panel 3 is provided. Since the fitting hole 14 is not visually observed, a third party does not intentionally insert a foreign substance into the upper case 2 from the second fitting hole 14.

  In the present embodiment, the flange 15b is integrally provided on the head 15a of the hexagon socket head bolt 15 as a member covering the second fitting hole 14, but it may be covered by a washer.

It is a front view of the electronic device which implemented the attachment structure of the surface panel which concerns on this invention. It is a perspective view of the electronic device which implemented the attachment structure of the surface panel which concerns on this invention. It is a perspective view which decomposes | disassembles and shows the electronic device which implemented the attachment structure of the surface panel which concerns on this invention. It is the IV-IV sectional view taken on the line in FIG. It is an enlarged view of the V section in FIG. It is an enlarged view of the VI section in FIG. It is an enlarged view of the VII part in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic device, 2 ... Upper case, 2a ... Surface, 3 ... Front panel, 5 ... 1st stud, 6 ... 2nd stud, 13 ... 1st fitting hole, 14 ... 2nd fitting hole 15 ... Hexagon socket head cap screw, 15b ...

Claims (2)

  A housing having a plurality of studs projecting on the surface, a surface panel formed of a transparent material having a coefficient of thermal expansion different from that of the housing and having a fitting hole that fits into the stud, and a head screwed into the stud In the mounting structure of the front panel provided with a fastening member that restricts the front panel from coming off from the stud, the fitting hole includes a first fitting hole that fits into the stud, and the stud And a plurality of second fitting holes that are loosely fitted with play, and the protruding height of the stud into which the second fitting holes are fitted is larger than the thickness of the surface panel. A surface panel mounting structure characterized by the above.   The surface panel mounting structure according to claim 1, wherein the second fitting hole is covered with the fastening member fastened to a stud fitted into the second fitting hole.

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