JP4585770B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic apparatus in which a display surface of a liquid crystal display device is viewed through a display window established in an exterior case, and more particularly to a mounting structure of a transparent plate that closes the display window of the exterior case.

  In an electronic device such as an in-vehicle audio device, a liquid crystal display device (LCD) is disposed inside an exterior case that is a panel surface of the device body, and information such as a song number and an operating state displayed on the liquid crystal display device. In general, the display window is viewed through a display window established in the outer case, but this display window is usually closed by a transparent plate made of glass or synthetic resin, and the internal liquid crystal display device has dust, dust, etc. The foreign material does not enter.

Conventionally, such a transparent plate is set to be larger than the display window of the exterior case, and a light-shielding paint with a predetermined width is printed on the outer peripheral portion of the lower surface of the transparent plate, and the transparent plate is placed on the lower surface side of the light-shielding paint. An electronic device is known that is fixed to an outer case using a double-sided adhesive tape (see, for example, Patent Document 1). This light-shielding paint extends slightly inward from the outer edge of the display window, and the double-sided adhesive tape or the like is not visible from the outside by the light-shielding paint, so the display surface of the liquid crystal display device is transparent surrounded by the light-shielding paint. The transparent part of the plate becomes the visible region.
JP-A-11-289169 (page 3-4, FIG. 1)

  However, in the conventional electronic device described above, a double-sided adhesive tape is used as a fixing member for the transparent plate that closes the display window of the exterior case, and the assembly operator accurately places the double-sided adhesive tape at a predetermined position on the transparent plate and the exterior case. Therefore, there is a problem that workability for attaching the transparent plate to the exterior case is poor. In addition, in order to make the double-sided adhesive tape invisible from the outside, it is necessary to print a light-shielding paint called part-off printing on the outer periphery of the lower surface of the transparent transparent board. There was also a problem of rising.

  The present invention has been made in view of such a state of the prior art, and an object of the present invention is to provide an electronic device that can be easily assembled and reduced in cost.

The present invention uses a light-shielding synthetic resin holder, which is a support member of the operation knob exposed on the surface of the outer case, as a fixing means for the transparent plate, and sandwiches the outer edge of the transparent plate between the holder and the outer case. By integrating the outer case and the holder while being fixed, the display window opened in the outer case was closed with a transparent plate.

Electronic device of the present invention, the holder for supporting the operation knob provided with an opening facing the display surface of the liquid crystal display device, while sandwiching and fixing the outer edge of the transparent plate around the opening in the outer casing and the holder exterior By integrating the case and the holder, the display window established in the exterior case is closed with a transparent plate, so the transparent plate can be easily attached without the need for fixing members such as double-sided adhesive tape. Thus, the assembling work can be simplified and the cost can be reduced. In addition, since the outer case and the holder are integrated by snap coupling around the transparent plate, the force for sandwiching the transparent plate of the holder and the outer case is stabilized.

In the electronic device of the present invention, a liquid crystal display device and a switch element mounted on a circuit board, a holder made of a light-shielding synthetic resin that supports an operation knob for operating the switch element, and a through-hole for exposing the operation knob And a display window that faces the display surface of the liquid crystal display device, and a transparent plate that closes the display window, and a jetty surrounding the display window is integrally formed on the back surface of the exterior case molded, the jetty has a plurality of engaging holes are formed on, the holder, Rutotomoni have opposed openings are provided in the display window, a plurality of the surface of the portion surrounding the opening Kakarigo突The engaging projections are inserted into a plurality of recesses formed on the peripheral edge of the transparent plate and snap-engaged with the engaging hole to thereby remove the outer edge portion of the transparent plate. The outer case It was configured to integrate the said holder and said outer case while sandwiching and fixed between the holder.

The electronic device configured as described above uses a holder, which is a support member of the operation knob exposed on the surface of the outer case, as a fixing means for the transparent plate, and sandwiches the outer edge portion of the transparent plate between the holder and the outer case. By integrating the outer case and the holder while fixing, the display window established in the outer case is closed with a transparent plate, so that a transparent plate can be used without a fixing member such as a double-sided adhesive tape. Can be easily attached to the exterior case. In addition, since the outer case and the holder are integrated by snap coupling around the transparent plate, the force for sandwiching the transparent plate of the holder and the outer case is stabilized.

In the above configuration, it is preferable that a plurality of elastic tongue pieces are integrally formed in a cantilever shape on the surface of the portion surrounding the opening of the holder , and the free ends of these elastic tongue pieces are elastically contacted with the back surface of the transparent plate, When such an elastic tongue piece is formed on the holder, the play of the transparent plate can be prevented and the transparent plate can be stably fixed over a long period of time.

  In the above configuration, it is preferable that the opening of the holder is formed to be smaller than the display window of the exterior case, and the visible area of the display surface of the liquid crystal display device is defined by the size of the opening. There is no need to print a light-shielding paint on the outer periphery of the plate, and the cost can be further reduced.

  In the above configuration, when a rib surrounding the opening is provided on the back surface of the holder and the rib abuts against the display surface of the liquid crystal display device, foreign matters such as dust and dust enter the visible region of the display surface. This is preferable because it can be surely prevented.

  1 is a front view of an electronic apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, FIG. 5 is an exploded perspective view of the electronic device viewed from the front side, and FIG. 6 is a view of the electronic device viewed from the back side. FIG. 7 is an exploded perspective view, FIG. 7 is a front view of a holder provided in the electronic device, FIG. 8 is a rear view of the holder, and FIG. 9 is an explanatory view showing an attached state of a transparent plate provided in the electronic device.

  The electronic apparatus according to the present embodiment is used as, for example, an in-vehicle audio device, and is attached to a metal external chassis (not shown) disposed on an in-vehicle instrument panel or the like, and a front portion of the external chassis. Synthetic resin outer case 1, holder 2 disposed on the back side of outer case 1, synthetic resin transparent plate 3 disposed between outer case 1 and holder 2, It is mainly composed of a circuit board 4 attached to the chassis.

  The outer case 1 constitutes the panel surface of the apparatus body, and a rectangular display window 5 is opened at the center thereof, and a disk insertion slot 6 and a plurality of through holes 7 are opened around the display window 5. Has been. A jetty 1 a is integrally formed on the back surface of the outer case 1 so as to surround the display window 5, and a plurality of engagement holes 1 b are formed in the jetty 1 a, and the outer peripheral wall of the outer case 1 is further formed. A plurality of engagement holes 1c are formed in the base (see FIG. 6).

  The holder 2 is made of a light-shielding synthetic resin, for example, a black ABS resin, and a plurality of convex portions 2e snapped into the respective engagement holes 1c of the outer case 1 are integrally formed on the outer peripheral wall thereof. A rectangular opening 8 facing the display window 5 of the outer case 1 is opened at the center of the holder 2, and the size of the opening 8 is set slightly smaller than the display window 5. As will be described later, the display window 5 and the opening 8 are closed by the transparent plate 3, and the transparent plate 3 is sandwiched and fixed between the back surface of the exterior case 1 and the surface of the holder 2. The holder 2 is provided with a long hole 9 that faces the disc insertion slot 5 of the outer case 1, and a plurality of operation knobs 10 exposed in the through holes 7 of the outer case 1 are swingably supported. In addition, a plurality of light guides 11 made of acrylic resin or the like are fixed by snap coupling.

  As shown in FIGS. 2 to 4 and FIGS. 7 to 9, the surface of the portion surrounding the opening 8 of the holder 2 is the mounting surface of the transparent plate 3 described above, and a plurality of elastic properties are provided on the mounting surface. The tongue piece 2a is integrally formed in a cantilever shape. Two sets of these elastic tongue pieces 2a are formed on the outer sides of the left and right short sides of the opening 8 as a set, and the two elastic tongue pieces 2a of each set are short of the opening 8 around the fixed end of each set. It extends in the opposite direction along the side. The transparent plate 3 receives a resilient force from each elastic tongue 2a and is pressed against the back surface of the outer case 1. The free end of each elastic tongue 2a has a hemispherical shape that contacts the back surface of the transparent plate 3. A protrusion 2b is formed. A plurality of engagement protrusions 2 c snapped into the respective engagement holes 1 b of the outer case 1 are integrally formed on the surface of the holder 2, and these engagement protrusions 2 c also function as positioning portions for the transparent plate 3. To do. That is, the transparent plate 3 is positioned in the surface direction with respect to the mounting surface of the holder 2 by inserting a plurality of concave portions 3 a formed on the peripheral edge portion of the transparent plate 3 into the corresponding engaging protrusions 2 c. It has become. On the other hand, a rib 2 d is integrally formed on the back surface of the holder 2, and the rib 2 d is formed in a frame shape along the outer peripheral edge of the opening 8.

  As shown in FIG. 5, a liquid crystal display device (LCD) 12, a rotary operation type variable resistor 13, a plurality of push switches 14, and a plurality of light emitting diodes (LEDs) 15 are mounted on the circuit board 4. A frame 16 made of a metal plate is attached to the display device 12. The frame 16 is formed with a window hole 16a for exposing the display surface 12a of the liquid crystal display device 12, and the tip of the rib 2d protruding from the holder 2 is inserted into the window hole 16a and comes into contact with the display surface 12a. (See FIG. 3). The rotary shaft 13a of the variable resistor 13 is inserted through the holder 2, and an operation knob 17 attached to the tip of the variable resistor 13 is exposed in the through hole 7 of the outer case 1 (see FIG. 1). The push switch 14 faces the operation knob 10 supported by the holder 2, and the light emitting diode 15 faces the light receiving surface of the light guide 11 fixed to the holder 2.

  In the electronic apparatus configured in this way, after inserting each recess 3a of the transparent plate 3 into the corresponding engagement protrusion 2c of the holder 2 and positioning it on the mounting surface around the opening 8, the outer case 1 and the holder 2 are snap-coupled and integrated so that the transparent plate 3 is sandwiched and fixed between the back surface of the outer case 1 and the surface of the holder 2. At that time, the outer case 1 and the holder 2 are snap-coupled not only at the outer peripheral portion by the engagement hole 1c and the convex portion 2e but also around the transparent plate 3 by the engagement hole 1b and the engagement protrusion 2c. Therefore, the clamping force between the outer case 1 and the holder 2 can be stabilized and the transparent plate 3 can be reliably fixed.

  Further, since the transparent plate 3 receives the elastic force from the elastic tongues 2a integrally formed with the holder 2 and is pressed against the back surface of the outer case 1, the transparent plates 3 are loosened by the elastic tongues 2a. Thus, the transparent plate 3 can be stably fixed over a long period of time regardless of changes in environmental temperature or the like.

  Further, since the opening 8 of the holder 2 is set somewhat smaller than the display window 5 of the outer case 1, the visible region of the display surface 12 a of the liquid crystal display device 12 is defined by the size of the opening 8. Can do. That is, as shown in FIGS. 2 and 3, the lengths of the long side and the short side of the display window 5 provided in the exterior case 1 are L1 and W1, respectively, and the length of the opening 8 provided in the holder 2 is set. If the lengths of the side and the short side are L2 and W2, respectively, these lengths have a relationship of L1> L2 and W1> W2. Therefore, the display surface 12a that can be viewed through the display window 5 and the transparent plate 3 The visible region is a range surrounded by the opening 8. Therefore, when the display surface 12a of the liquid crystal display device 12 is viewed from the outside of the exterior case 1, the periphery of the opening 8 appears to be a frame shape inside the outer peripheral edge of the display window 5, as indicated by the symbol M in FIG. Thus, since the portion M of the holder 2 has the same function as part-off printing, printing of the light-shielding paint required on the outer peripheral portion of the transparent plate 3 can be omitted, and the cost is reduced accordingly. Can be planned.

  Further, a rib 2d surrounding the opening 8 is provided on the back surface of the holder 2, and the tip of the rib 2d is brought into contact with the display surface 12a of the liquid crystal display device 12, so that foreign matters such as dust and dust are visible on the display surface 12a. Intrusion into the area can be surely prevented.

It is a front view of the electronic device which concerns on the Example of this invention. It is sectional drawing which follows the II-II line of FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is the disassembled perspective view which looked at this electronic device from the surface side. It is the disassembled perspective view which looked at this electronic device from the back side. It is a front view of the holder with which this electronic device is equipped. It is a reverse view of this holder. It is explanatory drawing which shows the attachment state of the transparent plate with which this electronic device is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exterior case 1a Jetty 1b, 1c Engagement hole 2 Holder 2a Elastic tongue piece 2b Protrusion part 2c Engagement protrusion 2d Rib 2e Convex part 3 Transparent board 3a Concave part 4 Circuit board 5 Display window 7 Through-hole 8 Opening 10 Operation knob 11 Conduction Light body 12 Liquid crystal display device 12a Display surface 16 Frame body 16a Window hole

Claims (4)

A liquid crystal display device and a switch element mounted on a circuit board, a holder made of a light-shielding synthetic resin that supports an operation knob that operates the switch element, a through hole that exposes the operation knob, and a display of the liquid crystal display device And a transparent plate that closes the display window. A jetty surrounding the display window is integrally formed on the back surface of the outer case, and a plurality of the jetty is formed on the jetty. of which the engagement hole is formed, the holder is Rutotomoni have opposed openings are provided in the display window, a plurality of engaging projections on the surface of the portion surrounding the opening is integrally molded The engagement protrusions are inserted into a plurality of recesses formed on the peripheral edge of the transparent plate and snap-engaged with the engagement holes, thereby the outer edge portion of the transparent plate is connected to the exterior case and the holder. Pinched An electronic apparatus characterized in that integrated with the holder and the outer case with a constant. 2. The elastic tongue piece according to claim 1, wherein a plurality of elastic tongue pieces are integrally formed in a cantilever shape on a surface of the portion surrounding the opening of the holder , and the free ends of the elastic tongue pieces are elastically contacted with the back surface of the transparent plate. Electronic equipment characterized by having been made.   3. The electronic device according to claim 1, wherein the opening is formed smaller than the display window, and a visible region of the display surface is defined by a size of the opening.   The electronic apparatus according to claim 1, wherein a rib surrounding the opening is provided on the back surface of the holder, and the rib is brought into contact with the display surface.

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