JP5207135B2 - Instrument device - Google Patents

Description

  The present invention relates to an instrument device having an antistatic structure.

  As this type of instrument device, for example, the one described in Patent Document 1 below is known. This instrument device has a holder provided with a display element made of a liquid crystal panel, a conductive rubber for connecting the display element and the circuit board, and a cell restraint for installing the display element on the circuit board via the holder. This cell restraint has an arm piece extending in the direction of the circuit board, and the arm piece is inserted into a guide portion provided in the holder, and a part protruding to the back side of the circuit board is folded and screwed to the circuit board. The display element, the conductive rubber, and the circuit board are brought into close contact with each other, and are secured and fixed integrally while ensuring electrical connection.

Further, as a static electricity prevention structure, a display plate, a circuit board, and a back cover are connected to each other in a conductive state using a coil spring to reduce a static voltage charged on the display plate (Patent Document 2). reference).
JP 2006-221017 A Japanese Patent Laid-Open No. 9-230065

  However, the instrument device described in Patent Document 1 may be erroneously displayed due to the influence of static electricity charged on the liquid crystal display panel on the panel. In addition, when an antistatic structure such as that described in Patent Document 2 is applied to a vehicle meter, the coil spring is sufficiently around the coil spring assuming that the spring is contracted in order not to suppress the elasticity of the spring. Clear clearance is provided. For this reason, the coil spring is shaken by the vibration of the vehicle and hits the peripheral wall holding the coil spring, and abnormal noise is generated.

  The present invention has been made in view of these points, and an object of the present invention is to provide an instrument device having an antistatic structure that is not easily affected by vibration.

In order to solve the above problems, the present invention
A display board having a fluoroscopic part;
A display element disposed so as to be visible through the fluoroscopic part;
A circuit board disposed on the back side of the display element and electrically connected to the display element;
A case body disposed between the circuit board and the display board;
A facing plate that is disposed on the front side of the display plate and hides a portion of the display plate that is not visually recognized,
In an instrument device comprising:
A first conductive member for flowing static electricity charged on the display board to the ground of the circuit board;
The first conductive member includes a first contact portion that contacts the display board, a second contact portion that contacts the circuit board, and a connection portion that connects the first and second contact portions. ,
The case body is provided with a holding portion for holding the connection portion.

  In the present invention, the first contact portion includes a pressing portion to which a predetermined tension is applied at a location where the first contact portion contacts the display plate.

  In the present invention, a second conductive member is provided between the circuit board and the second contact portion.

  In the present invention, the second contact portion penetrates the circuit board and is fixed to the back surface thereof by soldering.

ADVANTAGE OF THE INVENTION According to this invention, the instrument apparatus provided with the antistatic structure which is hard to be influenced by a vibration can be obtained.

  The example applied to the vehicle instrument as one Example of this invention is demonstrated based on an accompanying drawing. FIG. 1 is a front view of the instrument device. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a perspective view illustrating a structure for inserting a grounding body, FIG. 4 is a perspective view of a ground terminal, and FIG. 5 is a diagram illustrating a second embodiment of the grounding body. is there.

  As shown in FIGS. 1 and 2, the instrument device according to this embodiment is configured so that a transparent upper case 1, a liquid crystal display (display element) 2 composed of an integrated unit, and the liquid crystal display 2 can be seen. A display board 3 having a see-through portion 31, a hard circuit board 4 disposed behind the liquid crystal display 2 and electrically connected to the liquid crystal display 2, and disposed on the display board 3. A facing member 5 that cannot be visually recognized, a middle case (case body) 6 disposed between the circuit board 4 and the display board 3, and a lower (back) case that covers the back side of the circuit board 4. 7 is mainly composed.

  The liquid crystal display 2 includes a rectangular liquid crystal display panel 21 in which liquid crystal molecules are sealed between two glass substrates, and a smoke-like polarizing film is bonded to each glass substrate, and the back side of the liquid crystal display panel 21. (Not shown) having a light transmissive diffusion plate, a liquid crystal display panel 21 and a holder 22 on which the diffusion plate is supported, and a panel holding member (not shown) having a frame-like edge that holds the peripheral edge of the surface side of the liquid crystal display panel 21 And a light emitting diode (not shown) as a light source that is mounted on the circuit board 4 and illuminates the liquid crystal display panel 21 from behind. These components are unitized as a liquid crystal display 2. In the present embodiment, the liquid crystal display 2 is applied as a display device. However, any display element can be applied as well as the liquid crystal display 2 as long as it displays information according to an electric signal. There may be.

  The display board 3 has a translucent colored printed layer having a predetermined color and forming a scale, characters, marks, etc. on the surface of a base material made of a transparent synthetic resin panel, and a scale so as to surround the colored printed layer. In this embodiment, a see-through portion 31 is provided so that the liquid crystal display 2 can be seen through from an observer.

  The circuit board 4 is formed of a well-known hard board, and is electrically connected to each electrode terminal (not shown) of the display panel via a flexible wiring board at a predetermined position. Further, the circuit board 4 is electrically connected to the display board 3 through a ground body (first conductive member) 10 and a ground terminal (second conductive member) 14, whereby static electricity charged on the display board 3 is circuitized. It flows to a ground pattern (not shown) of the substrate 4.

  The grounding body 10 (first conductive member) is a conductive member made of a metallic material. As shown in FIG. 3, the first contact portion 11 that contacts the display panel 3 and the end of the first contact portion 11. A body part (connection part) 12 that bends from the part and extends to the circuit board 4 side and connects the first contact part 11 and a second contact part described later, and a circuit from the end part of the body part 12 on the circuit board 4 side. The second contact portion 13 is bent along the substrate surface of the substrate 4 and is in contact with the circuit substrate 4.

  When the first contact portion 11 is assembled with the display plate 3, the pressing portion 110 is inclined so as to approach the display plate 3 side so that the first contact portion 11 is suppressed in a state where a predetermined tension is applied from the display plate 3. Is formed. That is, by setting the angle between the pressing portion 110 and the body portion 12 to be larger than 90 degrees, the pressing portion 110 has elasticity (tension) with the display plate 3 in the assembled state with the display plate 3. It is set to touch.

  The body portion 12 is formed with contact portions 121 that contact a receiving portion provided in an insertion portion, which will be described later, on both sides of the substantially central portion (see FIG. 4).

  The second contact portion 13 is extended from the lower end portion of the body portion 12 to the liquid crystal display 2 side so as to be perpendicular to the body portion 12.

  As shown in FIG. 4, the ground terminal 14 is composed of, for example, a Z-shaped metal on-board contact and is entirely Z-shaped, and thus has a spring property that expands and contracts vertically. It is fixed on the circuit board 4. By using the ground terminal 14 having a spring property, reliable contact can be achieved even when a slight shift occurs in the contact position between the second contact portion 13 and the ground terminal 14 during assembly.

  The facing member 5 is made of a black synthetic resin and is disposed so as to cover the non-display area of the display board 3. At this time, since the tension acting upward (observer side) is applied to the first contact portion (pressing portion 110) at the three portions of the display plate that are in contact with the first contact portion 11, the display plate 3 may be lifted up, but the display plate 3 can be prevented from being lifted up by being pressed downward (on the circuit board 4 side) by the turning member 5.

  The middle case 6 is made of, for example, white synthetic resin, and a holder 22 that accommodates and supports the liquid crystal display 2 is integrally formed. As shown in FIG. 2, an insertion portion (holding portion) 60 to which the grounding body 10 is inserted and fixed (held) is integrally formed on the side wall of the middle case 6. As shown in FIG. 4, the insertion part 60 has a notch 61 for passing the second contact part 13 when the earth body 10 is inserted into the insertion part 60 in the direction of the arrow, and when the earth body 10 is completely inserted. The receiving portion 52 with which the abutting portion 121 abuts is provided.

  Next, a method for assembling the instrument device in the present embodiment will be described. First, the circuit board 4 on which the light source (not shown) for the liquid crystal display 2 and the ground terminal 14 are mounted is assembled to the back case 7. Thereafter, the middle case 6 in which the grounding body 10 is inserted into the insertion portion 60 is disposed on the back case 7 on which the circuit board 4 is disposed. At this time, the ground terminal 14 of the circuit board 4 and the second contact portion 13 come into contact with each other. And if the display board 3 is arrange | positioned on the middle case 6, the 1st contact part 11 and the display board 3 will contact. Thereafter, the facing member 5 is disposed on the display board 3 and the display board 3 is pressed to the first contact portion 11 side of the ground body 10. Finally, the upper case 1 is assembled to complete.

  In this way, the display plate 3 having the see-through portion 31, the liquid crystal display (display element) 2 disposed so as to be visible through the see-through portion 31, and the liquid crystal display 2 disposed on the back side of the liquid crystal display 2 An electrically connected circuit board 4, a middle case (case body) 6 disposed between the circuit board 4 and the display board 3, and a display board 3 disposed on the front side of the display board 3 need not be visually recognized. An instrument device comprising a turn-back plate 5 for concealing various locations, includes a grounding body (first conductive member) 10 for flowing static electricity charged on the display board 3 to the ground of the circuit board 4. A first contact portion 11 that contacts the plate 3, a second contact portion 13 that contacts the circuit board 4, and a connection portion 12 that connects the first and second contact portions. ) 6 is provided with an insertion portion (holding portion) 50 for holding the connecting portion 12. Ri, it is possible to prevent rattling caused by vibration of the vehicle. As a result, it is possible to obtain an instrument device that is hardly affected by vibration and has an antistatic structure.

In addition, the first contact part 11 can obtain a reliable contact with the display board 3 by having the pressing part 110 to which a predetermined tension is applied at a place where the first contact part 11 comes into contact with the display board 3.

  Further, by providing the ground terminal (second conducting member) 14 between the circuit board 4 and the second contact portion 13, a more reliable contact can be obtained.

  In the present embodiment, the first contact portion 11 is inclined to the display panel 3 side, but is not limited to this as long as reliable contact is maintained. For example, the second embodiment As shown in FIG. 5, a protrusion may be provided at a substantially central portion of the first contact portion 11, and in this case, it is only necessary to reliably contact the display plate 3.

  Although not shown in the figure as the third embodiment, the ground terminal 14 is abolished, and instead, the second contact portion 13 is passed through a through-hole provided in the circuit board 4 and bent to the circuit board 4 side. There is also a method of fixing with solder later. In this case, since it is not necessary to make the 2nd contact part 13 contact with the earthing terminal 14, an assembly operation can be simplified and more reliable contact can be obtained by fixing with solder.

The front view of the instrument apparatus in one Example of this invention. AA sectional drawing same as the above. The perspective view of the insertion structure of a grounding body same as the above. The perspective view of a ground terminal same as the above. The structure perspective view of the earthing | grounding body in 2nd Example same as the above.

Explanation of symbols

1 Upper case
2 Liquid crystal display
3 Display board 4 Circuit board 5 Look-back member 6 Middle case (case body)
7 Back case 10 Grounding body (first conductive member)
11 1st contact part 12 Connection part (torso part)
13 Second contact portion 14 Ground terminal (second conducting member)
21 Liquid crystal display panel 22 Holder 50 Insertion part (holding part)
51 Notch portion 52 Receiving portion 121 Contact portion

Claims (4)

A display board having a fluoroscopic part;
A display element disposed so as to be visible through the fluoroscopic part;
A circuit board disposed on the back side of the display element and electrically connected to the display element;
A case body disposed between the circuit board and the display board;
A facing plate that is disposed on the front side of the display plate and hides a portion of the display plate that is not visually recognized,
In an instrument device comprising:
A first conductive member for flowing static electricity charged on the display board to the ground of the circuit board;
The first conductive member includes a first contact portion that contacts the display board, a second contact portion that contacts the circuit board, and a connection portion that connects the first and second contact portions. ,
An instrument device comprising a holding part for holding the connection part in the case body. 2. The instrument device according to claim 1, wherein the first contact portion includes a pressing portion to which a predetermined tension is applied at a position where the first contact portion is in contact with the display plate. The instrument device according to claim 1, wherein a second conductive member is provided between the circuit board and the second contact portion. The instrument device according to claim 1, wherein the second contact portion penetrates the circuit board and is fixed to a back surface thereof by soldering.

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