Measurement device

Abstract

To provide a measurement device which can prevent fogging on a display due to water vapor.SOLUTION: In a measurement device 1 in which structures (a TFT module 8, wire substrates 9, 10, and an intermediate case 11, for example) contributing to information display are stored and are held in a case 5, the case 5 has an air hole 4, the air hole 4 is closed by a waterproof sheet 15 allowing gas to transmit and blocking liquid from transmitting, and the waterproof sheet 15 is provided with a cushioning material 16 for suppressing transmission of gas and blocking transmission of liquid. The cushioning material 16 has such an exterior shape that allows the waterproof sheet 15 to be visible.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an instrument device, and can be applied to an instrument device that displays various information such as speed on various moving bodies such as vehicles, agricultural construction machines, ships, snowmobiles, etc.

Background Art

[0002] Conventionally, a device related to an instrument device has been proposed (for example, Patent Document 1). In the configuration disclosed in this Patent Document 1, a configuration such as an electronic circuit for information display is housed in a case having ventilation holes, and the ventilation holes are closed by a sheet material that allows gas to pass through and blocks the passage of liquid, thereby preventing the intrusion of water droplets and preventing the occurrence of fog by the circulation of the atmosphere.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration disclosed in Patent Document 1, although the intrusion of liquid can be prevented, there is a problem that the display is fogged by the intruded water vapor because the intrusion of water vapor cannot be prevented. The present invention has been made in consideration of the above points, and proposes an instrument device capable of preventing the display from being fogged by water vapor.

Means for Solving the Problems

[0005] To solve such problems, the invention of claim 1 is In an instrument device that houses and holds a configuration for information display in a case, The case has ventilation holes, The ventilation holes are closed by a waterproof sheet that allows gas to pass through and blocks the passage of liquid, A cushioning material that suppresses gas permeation and blocks liquid permeation is provided on the waterproof sheet.

[0006] The invention according to claim 2 is, in the configuration of claim 1, the cushioning material has an outer shape formed so that the waterproof sheet can be visually recognized.

Advantages of the Invention

[0007] According to the present invention, the ventilation holes are blocked by the waterproof sheet that permeates gas and blocks liquid permeation. Furthermore, a cushioning material that suppresses gas permeation and blocks liquid permeation is provided on this waterproof sheet, so that the amount of air inflow can be accurately controlled and the intrusion of water vapor can be suppressed. As a result, clouding of the display due to water vapor can be prevented.

[0008] Also, according to the configuration of claim 2, since the outer shape of the cushioning material is formed so that the waterproof sheet can be visually recognized, the arrangement of the waterproof sheet can be confirmed visually.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0010] 〔First Embodiment〕 FIG. 1 is a plan view of an instrument device according to a first embodiment of the present invention, and FIG. 2 is a rear view of the instrument device of FIG. 1.

[0011] This instrument device 1 is attached to a vehicle by a fitting (not shown) and displays various information such as speed. Note that the present invention is not limited to vehicles and can be widely applied to instrument devices of various moving bodies such as agricultural construction machines, ships, and snowmobiles.

[0012] This instrument device 1 is formed in a substantially flat plate shape, and a display unit 2 is provided at the center of the front side. Information such as vehicle speed and direction indicator is displayed on this display unit 2. Further, the instrument device 1 is provided with a connector 3 for obtaining information and power supply on the back surface, and a plurality of ventilation holes 4 are provided on the back surface.

[0013] FIG. 3 is a partial cross-sectional view showing the instrument device of FIG. 2 cut along line A-A. This instrument device 1 houses and holds a configuration for information display (hereinafter, appropriately referred to as a main part configuration) in a case 5.

[0014] The case 5 includes an upper case 5A that covers the front side and the side surfaces, and a lower case 5B that covers the back surface and the side surfaces. The upper case 5A and the lower case 5B are fitted together on the side surfaces via a packing 6. Further, the case 5 has an opening formed at a portion corresponding to the display unit 2 of the upper case 5A, and an insert lens 7 is disposed in this opening by a transparent plate-like member. Thereby, the case 5 is formed so that air does not enter from the joint portion between the upper case 5A and the lower case 5B and the joint portion between the upper case 5A and the insert lens 7, and convection can be achieved between the internal air and the outside air only through the ventilation holes 4.

[0015] The upper case 5A is formed by injection molding, for example, an AES (acrylonitrile ethylene propylene diene styrene) resin, and the lower case 5B is formed by injection molding, for example, a polypropylene (PP) resin. The insert lens 7 is formed by injection molding, for example, a PMMA resin (acrylic resin), and the packing 6 is made of, for example, chloroprene rubber sponge (CR sponge).

[0016] The main part configuration includes a TFT (Thin Film Transistor) module 8, first and second wiring boards 9 and 10, a middle case 11, a packing 12, and the like.

[0017] The TFT module 8 displays various vehicle information by means of an image display panel using TFT liquid crystal. The first and second wiring boards 9 and 10 generate operating power by the power input via the connector 3 to control the operation of each part, and circuit components such as circuit components for driving the TFT module 8 by various information input via the connector 3 are mounted thereon.

[0018] The middle case 11 is formed by injection molding, for example, a polypropylene (PP) resin, and is provided to position and protect the TFT module 8.

[0019] The packing 12 is made of, for example, CR sponge, and is provided to fill the gap between the TFT module 8 and the upper case 5A and suppress the vibration of the TFT module 8.

[0020] FIG. 4 is a perspective view showing in detail the configuration of the ventilation hole of the instrument device of FIG. 1. The ventilation hole 4 (FIG. 2) is formed in a circular cross-sectional shape, and a waterproof sheet 15 and a cushioning material 16 are sequentially provided (that is, in a stacked state).

[0021] More specifically, the ventilation hole 4 is provided with a support portion 4A that extends outward from the center and connects to the inner wall surface. The ventilation hole 4 is formed such that the inner end surface of the support portion 4A is substantially flush with the inner end surface surrounding the ventilation hole 4, and the waterproof sheet 15 is disposed on the inner end surface of the support portion 4A and the inner end surface surrounding the ventilation hole 4 via an adhesive layer, an adhesive layer, or the like. By providing the support portion 4A in this way, the instrument device 1 can improve the workability related to the attachment work of the waterproof sheet 15.

[0022] Here, the waterproof sheet 15 is a sheet material that permeates gas and blocks the permeation of liquid, and is formed in a circular shape so as to close the ventilation hole 4. As the waterproof sheet 15, for example, a sheet material made of PTFE (polytetrafluoroethylene) resin can be applied.

[0023] The cushion material 16 is a cushion material (packing member) having a substantially D-shaped front view that suppresses gas permeation and blocks liquid permeation, and for example, a sheet material made of CR sponge can be applied. The cushion material 16 is formed with an outer shape such that the waterproof sheet 15 can be visually recognized, and in the example of FIG. 4, it is formed in a substantially circular shape with a part of the outer peripheral portion cut out (omitted).

[0024] Here, in FIG. 4, 5C is an annular portion provided on the lower case 5B so as to surround the cushion material 16 (waterproof sheet 15), and in FIG. 4, 5D is a pair of positioning portions provided inside the annular portion 5C for positioning and fixing the cushion material 16. These positioning portions 5D are configured as vertical wall portions provided corresponding to the above-mentioned cut-out portions in the cushion material 16. The positioning portion 5D here is formed in the gap portion (void) between the annular portion 5C and the waterproof sheet 15. Note that a clearance may be provided between the annular portion 5C and the cushion material 16 as necessary.

[0025] In this way, the ventilation hole 4 is blocked by the waterproof sheet 15 that permeates gas and blocks liquid permeation, and further, by providing the cushion material 16 that suppresses gas permeation and blocks liquid permeation on this waterproof sheet 15, the air inflow amount can be accurately controlled to suppress the intrusion of water vapor, thereby preventing the display from fogging due to water vapor.

[0026] Furthermore, since the outer shape of the cushion material 16 is formed so that the waterproof sheet 15 (a part of the waterproof sheet 15) can be visually recognized, the arrangement of the waterproof sheet 15 can be visually confirmed to prevent the occurrence of defective products. Note that when this is practically sufficient, the cushion material 16 may be formed in a circular shape by omitting the cut-out.

[0027] According to the above configuration, the vent hole 4 is blocked by the waterproof sheet 15 that allows gas to permeate and blocks the permeation of liquid. Further, a cushioning material 16 that suppresses the permeation of gas and blocks the permeation of liquid is provided on the waterproof sheet 15, so that the intrusion of water vapor can be suppressed compared to the prior art, and thus the fogging of the display due to water vapor can be prevented.

[0028] Furthermore, since the outer shape of the cushioning material 16 is formed so that the waterproof sheet 15 is visible, the arrangement of the waterproof sheet 15 can be visually confirmed, and the occurrence of defective products can be prevented in advance.

[0029] 〔Other Embodiments〕 As described above, the specific configuration suitable for the implementation of the present invention has been described in detail. However, the present invention can be variously modified within the scope not departing from the gist of the present invention.

Explanation of Reference Numerals

[0030] 1 Instrument device 2 Display unit 3 Connector 4 Vent hole 4A Support portion 5 Case 5A Upper case 5B Lower case 6 Packing 7 Insert lens 8 TFT module 9 Second wiring board 11 Middle case 12 Packing 15 Waterproof sheet 16 Cushioning material

Claims

1. In an instrument device that houses and holds a configuration for information display in a case, the case has ventilation holes, the ventilation holes are closed by a waterproof sheet that allows gas to pass through and blocks the passage of liquid, the instrument device, wherein a cushioning material that suppresses the passage of gas and blocks the passage of liquid is provided on the waterproof sheet.

2. The instrument device according to claim 1, wherein the cushioning material has an outer shape that allows the waterproof sheet to be visible.

Images