JP5432830B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  Conventionally, a display device for operating an air conditioner or an audio device or displaying an operation state of these devices is mounted on a vehicle or the like.

  The display device is composed of a plurality of parts. For example, Patent Document 1 discloses components of a conventional display device. As shown in FIG. 9, a conventional display device 100 includes a circuit board 102, a display 104, a plurality of switches 105, and a buffer member 106 made of an elastic material. Further, the display device 100 includes a plurality of knobs 108 that assist the pressing operation of the switch 105 and a plurality of guides 110 that regulate the moving direction of the knob 108. The display device 100 further includes a front surface side cover 112 and a back surface side cover 114, and a window member 116 attached to the front surface side cover 112.

  The conventional display device 100 is assembled as follows. First, the plurality of switches 105 are fixed to the circuit board 102 by soldering or the like. Next, the knob 108 and the guide 110 are combined, and this combination is disposed on the back surface of the front surface side cover 112. Further, the buffer member 106 and the circuit board 102 are disposed thereon. At that time, the circuit board 102 is positioned by guide means (not shown) provided on the front surface side cover 112. Next, the front side cover 112 and the back side cover 114 are fixed by fastening means such as screws (not shown). Finally, the window member 116 is fixed to the surface side cover 112 by an adhesive means such as an adhesive.

Japanese Patent Laying-Open No. 2005-119583

  Here, assembling the apparatus increases the number of man-hours as the number of components increases, which causes an increase in cost. For this reason, there is a demand for reducing the number of components of the display device in order to reduce costs.

  The present invention relates to a display device. The display device includes a circuit board, a display that displays information sent from the circuit board, and a cover that includes a display opening that is aligned with the display. Further, the display device includes a sheet member disposed between the circuit board and the display and the cover. The sheet member is formed with a movable contact disposed opposite to the contact formed on the circuit board, and a buffer portion sandwiched between the display and the cover.

  By this invention, the display apparatus which reduced the number of parts compared with the past can be provided.

It is a figure which illustrates the component of the display apparatus which concerns on this embodiment. It is a figure which illustrates the contact sheet which concerns on this embodiment. It is sectional drawing of the contact sheet which concerns on this embodiment. It is sectional drawing of the contact sheet which concerns on this embodiment. It is a figure which shows the modification of the contact sheet which concerns on this embodiment. It is sectional drawing of the display apparatus which concerns on this embodiment. It is sectional drawing of the display apparatus which concerns on this embodiment. It is a figure which shows the modification of the contact sheet which concerns on this embodiment. It is a figure which shows the component of the display apparatus which concerns on a prior art.

  FIG. 1 shows components of a display device 10 according to the present embodiment. In addition, the display apparatus 10 which concerns on this embodiment is used as a vehicle-mounted air conditioning display or an audio display, for example.

  The display device 10 includes a circuit board 12, a display 14, and a contact sheet 16. The display device 10 further includes a plurality of knobs 20 and a guide 22 that regulates the moving direction of the knobs 20. Further, the display device 10 includes a front side cover 24 and a back side cover 26, and a window member 28 attached to the front side cover 24.

  The circuit board 12 is connected to an air conditioner and an audio device (not shown), and is also connected to the display 14. The circuit board 12 sends an operation command to the air-conditioning equipment and the audio equipment, and sends information indicating the operation state of these equipment to the display unit 14. The circuit board 12 is formed of a so-called printed board, and wiring and fixed contacts described later are formed on a board made of an insulator.

  The display device 14 is a panel-type display device including a liquid crystal display (LCD) or the like, and includes a display surface 30 that displays information sent from the circuit board 12. The display 14 is supported by a display holder 32 provided on the circuit board 12. The indicator holder 32 has a hollow structure, and a backlight (not shown) that illuminates the indicator 14 is accommodated therein.

  The contact sheet 16 is also called a rubber switch or a switch sheet, and is made of an elastic material made of silicon rubber or the like. As shown in FIG. 2, the contact sheet 16 is formed with a plurality of movable contacts 36 and a buffer portion 38.

  FIG. 3 shows an AA sectional view (FIG. 1) when the contact sheet 16 is arranged on the circuit board 12. The contact sheet 16 and the circuit board 12 are provided with a positioning mechanism (not shown), and the contact sheet 16 is arranged at a predetermined fixed position with respect to the circuit board 12. The movable contact 36 of the contact sheet 16 is formed at a position corresponding to the fixed contact 39 of the circuit board 12. When the contact sheet 16 is arranged at the above-described fixed position, the movable contact 36 is separated from the fixed contact 39. Opposite in state.

  The movable contact 36 includes a pressing portion 40 and a support portion 42 that supports the pressing portion 40. The pressing portion 40 includes a pressed surface 46 that is pressed from a pressing rod 44 of the knob 20 described later, and a conductive surface 48 that faces the pressed surface 46 and is coated with a conductive film such as a metal film. Further, the thickness T1 of the support portion 42 is formed to be thinner than the thickness T2 of the contact sheet 16, and when the pressing portion 40 is pressed, the support portion 42 bends as shown in the lower part of FIG. The surface 48 contacts the fixed contact 39. As a result, the movable contact 36 and the fixed contact 39 are electrically connected. When the pressing is released, the pressing portion 40 is separated from the fixed contact 39 by the elasticity of the support portion 42 as shown in the upper part of FIG. As a result, the conduction between the movable contact 36 and the fixed contact 39 is cut off.

  Further, the buffer portion 38 of the contact sheet 16 is formed at a position corresponding to the display surface 30, and when the contact sheet 16 is disposed at the fixed position described above, the buffer portion 38 includes the display device 14 and the display device holder 32. It is arranged so as to cover. The buffer portion 38 functions as a cushion for protecting the display device 14 and prevents the display device 14 from contacting with peripheral components such as the front surface cover 24.

  As shown in FIG. 2, the buffer portion 38 includes a side wall 50 that extends substantially vertically from the contact sheet 16, and a contact portion 52 that is connected to the side wall 50 and contacts the display surface 30 of the display 14. The contact portion 52 has a frame shape in which an opening 54 (see FIG. 2) is formed, and the contact portion 52 is in contact with only the peripheral portion of the display surface 30 (see FIG. 3) of the display 14. It is configured. Here, the peripheral portion of the display surface 30 indicates a peripheral portion of the display surface 30 where information is not displayed.

  When the buffer portion 38 is formed of highly transparent silicon rubber or the like having high light transmittance, the display on the display surface 30 can be confirmed even if the entire surface of the display surface 30 is covered with the contact portion 52. Therefore, in such a case, the contact portion 52 does not need to be provided with the opening 54.

  As described above, the display device 10 according to the present embodiment includes the contact sheet 16 in which the movable contact 36 and the buffer portion 38 are integrally formed, instead of the switch and the buffer frame that are components of the conventional display device. Yes. That is, the display device 10 according to the present embodiment has a smaller number of parts than the conventional display device. Thereby, the assembly man-hour of the display apparatus 10 reduces, and the cost concerning the assembly operation of a display apparatus can be reduced rather than before.

  Further, in the present embodiment, the plurality of movable contacts 36 are integrally formed on the contact sheet 16. Thereby, the number of parts can be reduced as compared with the conventional display device in which individual switches are assembled to the circuit board 12. Further, as described above, by aligning the contact sheet 16 and the circuit board 12 by an alignment mechanism (not shown), the movable contacts 36 of the plurality of contact sheets 16 and the fixed contacts 39 of the plurality of circuit boards 12 are positioned. Matched (opposite). Therefore, as compared with the prior art in which individual switches are assembled to the fixed contact 39 of the circuit board 12, it is possible to save assembling work and to shorten the assembling time.

  4, the height H1 from the circuit board 12 to the contact portion 52 is substantially equal to the sum of the plate thickness H2 of the display 14 and the height H3 of the display holder 32 from the circuit board 12. It is configured to be equal (H2 + H3≈H1). Here, as shown in the lower part of FIG. 4, due to variations in the processing accuracy of the display holder 32, the sum of the height H <b> 3 of the display holder 32 and the plate thickness H <b> 2 of the display 14 is the contact portion 52. In some cases (H2 + H3> H1). As a result, the movable contact 36 near the contact portion 52 is lifted with respect to the circuit board 12. As a result, even if the pressing portion 40 of the movable contact 36 is pressed, the conductive surface 48 may not contact the fixed contact 39 of the circuit board 12 and the circuit may not be conducted. Therefore, as shown in the upper part of FIG. 5, a folded portion (pleat) 56 having a thickness smaller than the thickness T <b> 2 of the contact sheet 16 may be formed between the contact portion 52 and the movable contact 36. As shown in the lower part of FIG. 5, when the contact portion 52 is lifted by the display device holder 32 and the display device 14, the folded portion 56 is opened, so that the movable contact 36 can be prevented from being lifted with respect to the circuit board 12. Note that the folded portion 56 may be provided on the side wall 50.

  Returning to FIG. 1, the display device 10 includes a knob 20 and a guide 22. The knob 20 and the guide 22 have a role of assisting the operator to press the movable contact 36. When the movable contact 36 is significantly smaller than the operator's finger, it is difficult to directly press the movable contact 36 with the finger, and therefore the operator presses the movable contact 36 via the knob 20. The knob 20 moves along the guide 22 and presses the pressing portion 40 of the movable contact 36. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 1 as a cross-sectional view of the display device 10 after assembly. The knob 20 is a member having an E-shaped cross section, and includes a pressing portion 58 pressed by an operator and a side wall 60 extending perpendicularly from the pressing portion 58. Further, a pressing rod 44 extends from the pressing portion 58 in parallel with the side wall 60.

  The guide 22 has a hollow cylindrical shape, and the two are combined so that the knob 20 covers the guide 22. When the knob 20 is pressed, the knob 20 moves along the side wall 61 of the guide 22. As the knob 20 moves, the pressing rod 44 presses the pressing portion 40 of the movable contact 36. As a result, as shown in FIG. 7, the support portion 42 of the movable contact 36 is bent, and the conductive surface 48 comes into contact with the fixed contact 39 of the circuit board 12. Thereby, the movable contact 36 and the fixed contact 39 are conducted.

  In the present embodiment, a plurality of guides 22 are integrally formed on a single plate. As a result, the number of components can be reduced as compared with the conventional technique using a plurality of independent component guides 22.

  Returning to FIG. 1, the front cover 24 has a plurality of insertion openings 62 into which the knobs 20 are inserted. Further, a display opening 64 is provided at a position corresponding to the display device 14. A window member 28 made of a light transmissive member such as glass or plastic is fixed to the display opening 64 with an adhesive, a double-sided tape or the like. A holding frame (not shown) for holding the peripheral edge of the display 14 is formed on the back side of the front side cover 24. In addition, since the indicator 14 is sufficiently fixed by the indicator holder 32 and the buffer portion 38 of the contact sheet 16, the holding frame may be omitted.

  Next, assembly of the display device 10 according to the present embodiment will be described with reference to FIG. First, the display 14 is placed on the display holder 32. Next, the combined body of the knob 20 and the guide 22 is disposed on the back surface of the front surface side cover 24. At that time, the insertion openings 62 of the front cover 24 are made to coincide with the knobs 20, and the knob 20 is inserted into the insertion openings 62 of the front cover 24. Furthermore, the contact sheet 16 and the circuit board 12 are installed in that order. At that time, the contact sheet 16 and the circuit board 12 are respectively positioned by guide means (not shown) provided on the front surface side cover 24. Thereafter, the front side cover 24 and the rear side cover 26 are fixed by fastening means such as screws. Finally, the window member 28 is fixed to the display opening 64 of the front cover 24.

  During the assembly described above, the buffer portion 38 of the contact sheet 16 is sandwiched between the display surface 30 of the indicator 14 and the front cover 24. The buffer portion 38 prevents contact between the display surface 30 and the surface side cover 24 and prevents rattling of the display 14. Further, the side wall 50 (see FIG. 2) of the buffer portion 38 covers the periphery of the display device 14, thereby preventing foreign matter from adhering to the display device 14. In the above-described embodiment, the side wall 50 is formed over three surfaces, but the side wall 50 may be formed over four surfaces as shown in FIG. As a result, the entire side surface of the display 14 is covered, and the effect of preventing the adhesion of foreign matters is improved.

  In the above-described embodiment, the knob 20 and the guide 22 that assist the operation of the movable contact 36 of the contact sheet 16 are used as components of the display device 10, but the movable contact 36 can be easily operated by the operator's finger. The knob 20 and the guide 22 may be omitted.

  DESCRIPTION OF SYMBOLS 10 Display apparatus, 12 Circuit board, 14 Display, 16 Contact sheet, 20 Knob, 22 Guide, 24 Front side cover, 26 Back side cover, 28 Window member, 30 Display surface, 32 Display holder, 36 Movable contact, 38 Buffer part, 39 Fixed contact, 40 Movable contact pressing part, 42 Support part, 44 Pressing rod, 46 Pressed surface, 48 Conductive surface, 50 Buffer part side wall, 52 Contact part, 54 Opening, 56 Folding part, 58 Knob pressing part, 60 knob side wall, 61 guide side wall, 62 insertion slot, 64 display opening.

Claims (2)

A circuit board provided with a holder on the board surface;
A display provided on the holder and displaying information sent from the circuit board;
A cover with a display opening aligned with the indicator;
A movable contact disposed between the circuit board and the display and the cover, and disposed opposite to the contact formed on the circuit board; and a buffer portion sandwiched between the display and the cover; Is formed , and further, the assembly process to the circuit board and the display unit is composed only of lamination on the circuit board and the display unit, and a sheet member,
A display device comprising: The display device according to claim 1,
The display is provided on the circuit board so as to be separated from the contact of the circuit board in the thickness direction of the circuit board,
A display device, wherein a guide member is disposed between the sheet member and the cover to hold a region between the buffer portion and the movable contact of the sheet member toward the circuit board.

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