Instrumentation

Abstract

To provide an instrument device capable of reducing noise of a display board even when comprising an acoustic member.SOLUTION: An instrument device comprises: a plate-like display board 1; a first case member 2 which is arranged behind the display board 1, and mounted with the display board 1; an end sheet member 3 which is arranged before the display board 1 and has an opening part 31 for viewing the display board 1; a circuit board 4 which is arranged behind the first case member 2; and an acoustic member 5 which is arranged behind the first case member 2, and controlled by the circuit board 4. The display board 1 is held between the first case member 2 and the end sheet member 3, and the end sheet member 3 has a gap G formed with the display board 1 at a position opposed to the acoustic member 5.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an instrument device mounted on a vehicle such as an automobile.

Background Art

[0002] Conventionally, in this type of instrument device, for example, the one described in Patent Document 1 below is known. In the instrument device described in Patent Document 1, a display panel (dial plate) is disposed on the front side of the middle case, and the display panel is sandwiched between a backing disposed on the front side of the display panel and the middle case. Further, a circuit board is disposed on the back side of the middle case, and the circuit board is sandwiched between an outer case disposed on the back side of the circuit board. A speaker (acoustic member) is disposed on the back side of this circuit board.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the speaker is sounded (produces sound), there is a problem that the display panel vibrates and abnormal noise is generated between the display panel and the backing.

[0005] Therefore, an object of the present disclosure is to provide an instrument device capable of reducing abnormal noise of a display panel even when an acoustic member is provided in order to address the above-described problems.

Means for Solving the Problems

[0006] The instrument device of the present invention includes a plate-shaped display panel 1, a first case member 2 disposed behind the display panel 1 for mounting the display panel 1, a back member 3 disposed in front of the display panel 1 and having an opening 31 through which the display panel 1 can be visually recognized, a circuit board 4 disposed behind the first case member 2, and an acoustic member 5 disposed behind the first case member 2 and controlled by the circuit board 4. The display panel 1 is sandwiched between the first case member 2 and the back member 3, and the back member 3 has a gap G between it and the display panel 1 at a position facing the acoustic member 5.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0008] The present disclosure relates to an instrument device for a vehicle, and can be applied, for example, to an instrument device for a vehicle mounted on a moving body equipped with an automobile, a motorcycle, or an agricultural machine or a construction machine. Hereinafter, based on FIGS. 1 to 4, the case where the embodiment of the present disclosure is applied to an instrument device mounted on an automobile will be described as an example.

[0009] In the following, for the sake of easy understanding of the configuration of the instrument device, for each member, the direction in which the driver seated in the vehicle driver's seat views the instrument device (the display panel side in FIG. 2) is defined as "front (Fr. in the figure)", and the opposite side (the circuit board side) is defined as "rear (Re. in the figure)". Also, the vertical direction (To., Bo. in the figure) corresponds to the up-down direction of the vehicle, and the left-right direction (L, R in the figure) corresponds to the left-right turning direction of the vehicle.

[0010] (First Embodiment)

[0011] As shown in FIG. 1, the instrument device includes a pointer display unit 100 composed of a speedometer for displaying vehicle speed, an information display unit 200 for displaying various information regarding the vehicle, and an operation / warning lamp 300 for the vehicle.

[0012] As shown in FIG. 2, the instrument device is at least composed of a plate-shaped dial (display plate) 1, an inner case (first case member) 2 disposed behind the dial 1 and on which the dial 1 is placed, a bezel (bezel member) 3 disposed in front of the dial 1 and having an opening 31 through which the dial 1 can be visually recognized, a circuit board 4 disposed behind the inner case 2, a speaker (acoustic member) 5 disposed behind the inner case 2, behind the circuit board 4 and controlled by the circuit board 4, an outer case (second case member) 6 disposed behind the circuit board 4, a display 7 disposed in front of the circuit board 4, a pointer 8 disposed in front of the dial 1, and a transparent panel 9 disposed in front of the bezel 3.

[0013] As shown in FIGS. 1 and 2, the pointer display unit 100 is displayed by the pointer 8 indicating the scale, numbers, and other index portions 11 on the dial 1.

[0014] As shown in FIG. 1, the information display unit 200 is displayed by displaying various information regarding the vehicle on the display portion 71 of the display 7.

[0015] As shown in FIG. 1, the operation / warning lamp 300 is displayed by the operation / warning portion 13 on the dial 1 emitting light.

[0016] The dial 1 is made of, for example, a transparent or translucent light-transmissive synthetic resin (for example, acrylic or polycarbonate). The dial 1 has a light-shielding layer (not shown) formed by printing light-shielding black ink on the front and back surfaces of a thin plate-shaped base material. The dial 1 is sandwiched and fixed between the inner case 2 and the bezel 3. The dial 1 has an index portion 11, a window portion 12, and an operation / warning portion 13.

[0017] The indicator section 11 is formed along the rotation locus of the pointer 8, and the light-shielding layer is printed in the form of scales or numbers by knockout printing. The indicator section 11 receives the illumination light from the rear light source 41 and emits light.

[0018] The window section 12 is formed by knockout printing a light-shielding layer in a substantially rectangular shape at a position facing the display 7. The window section 12 opens the display section 71 of the display 7 so that the driver can visually recognize it.

[0019] The operation / warning section 13 is formed by knockout printing a light-shielding layer in the design of warning lights such as various operation lights such as turn signals and high beams, and fuel level warning lights. The operation / warning section 13 receives the illumination light from a rear light source (not shown) and emits light.

[0020] For the pointer 8, a well-known configuration made of, for example, a transparent or opaque light-transmissive synthetic resin (e.g., polycarbonate or ABS) can be applied. The pointer 8 is mounted on the rotation shaft 10a of a motor 10, which is a driving component consisting of an instrument movement fixed behind the circuit board 4, and is rotated by this motor 10. The pointer 8 receives the illumination light from the rear light source 41 and emits light.

[0021] The light source 41 is composed of a chip-type light-emitting diode (LED: Light Emitting Diode) that emits an appropriate color.

[0022] For the display 7, a well-known configuration can be applied in which a display element having a substantially rectangular display section 71 (not shown below), an optical member (e.g., a diffusion sheet or a prism sheet), a light guide, a light source, and a circuit board are housed in a metal frame made of, for example, aluminum. The display 7 has a flexible printed circuit board (FPC: Flexible Printed Circuits) and is conductively connected to the circuit board 4 by the flexible printed circuit board.

[0023] The display element consists of, for example, a dot matrix type TFT (Thin Film Transistor) liquid crystal display panel having a plurality of pixels, and based on detection signals from various sensors mounted on the vehicle, it displays predetermined information 71a of the vehicle such as engine speed, average fuel consumption, fuel consumption, outside air temperature, etc. on the display unit 71.

[0024] The frame has a plurality of boss portions 72 protruding rearward. The display 7 is fixed on the circuit board 4 by fixing means such as screws being inserted into the boss portions 72 from the rear of the circuit board 4.

[0025] The circuit board 4 consists of a rigid wiring board formed by applying a wiring pattern (not shown) to a glass epoxy-based substrate such as FR-4 (Flame Retardant-4). The circuit board 4 has a light source 41, a motor 10, and a connector 42 conductively connected to the wiring pattern. The circuit board 4 has control means (not shown below) and resistance elements for driving and controlling the light source 41, the motor 10, the speaker 5, and the display 7, and outputting a command signal for operating the display 7.

[0026] The bezel 3 is made of an opaque black synthetic resin (for example, polypropylene, etc.) and is disposed in front of the display board 1. The bezel 3 has an opening 31, an abutting portion 32, and a hook (locking portion) 33.

[0027] The opening 31 is formed in an annular shape so as to extend forward and surround the display board 1 in the circumferential direction, and covers the pointer display portion 100, the information display portion 200, and the operation / warning lamp 300 so that the driver can visually recognize them.

[0028] The abutting portion 32 is formed on the display board 1 side of the opening 31 and abuts against the display board 1. The abutting portion 32 is formed in a rib shape with a rectangular cross-section and is formed over the entire circumference of the opening 31. As shown in FIGS. 1 and 2, the abutting portion 32 has a notch portion 32a where the position facing the speaker 5 (the position overlapping when the instrument device is viewed from the front) is cut out. In the notch portion 32a, a gap G of about 0.2 mm is formed between the display board 1.

[0029] A plurality of hooks 33 are formed on the outer periphery of the instrument device when viewed from the front. The hook 33 is formed on the outer periphery of the flange 3 and extends rearward. The hook 33 is locked and fixed to a receiving portion 61 formed on the outer case 6.

[0030] The transparent panel 9 is made of, for example, a translucent synthetic resin (such as acrylic) and functions as a covering member that covers the front of the flange 3. The transparent panel 9 is locked and fixed to the flange 3 and the like by hooks or the like. By being formed in this way, the instrument device becomes a closed housing by the transparent panel 9, the flange 3, and the outer case 6.

[0031] The middle case 2 is made of a light-shielding white synthetic resin (such as polypropylene). The nameplate 1 is fixed to the front of the middle case 2, and the circuit board 4 is fixed to the rear. The middle case 2 houses the light source 41, and an illumination chamber is formed to guide the light emitted by the light source 41 to the indicator portion 11 and the pointer 8. The middle case 2 is sandwiched and fixed by the flange 3 and the outer case 6 together with the nameplate 1 and the circuit board 4.

[0032] The outer case 6 is made of a light-shielding white synthetic resin (such as polypropylene). The outer case 6 houses the nameplate 1, the middle case 2, and the circuit board 4 inside.

[0033] The speaker 5 is a visual information providing component that converts an audio output signal (electrical signal) into sound and emits voice or warning sounds. Although not shown in detail, the speaker 5 is composed of a magnetic circuit, a voice coil, a diaphragm, and a frame. When an electric current flows through the voice coil, a force acts on the voice coil, and the diaphragm vibrates in conjunction with the movement of the voice coil to emit sound. It is a moving coil type speaker (cone speaker) having a disc shape.

[0034] As shown in FIG. 2, the speaker 5 is connected to a speaker-side cord 5a made of an electric cord. The speaker-side cord 5a is connected to the connector 42 and is in conduction with the circuit board 4. The speaker 5 is disposed in a hole of the outer case 6 and is fixed to the outer case 6 by fixing means such as screws at its outer periphery. As shown in FIG. 1, the speaker 5 is disposed between two hooks 33 (illustrated as D and E).

[0035] Conventionally, when the speaker 5 is sounded, the vibration of the speaker 5 is transmitted to the outer case 6, and the vibration is transmitted to the middle case 2 and the backrest 3, and the vibration of the middle case 2 is transmitted to the nameplate 1. In this way, there is a problem that interference is repeated between the nameplate 1 and the abutting portion 32 of the backrest 3 due to the vibration of the nameplate 1 and the backrest 3, resulting in abnormal noise. In particular, when the abutting portion 32 is present at a position facing the speaker 5, there is a problem that the abnormal noise is large.

[0036] According to the present disclosure, by forming a gap G between the abutting portion 32 (backrest 3), abnormal noise between the nameplate 1 and the backrest 3 can be reduced.

[0037] (Second Embodiment) A second embodiment of the instrument device according to the present disclosure will be described with reference to FIG. 4. The same parts and equivalent parts as those in the above-described first embodiment will be described with the same reference numerals.

[0038] The speaker 51 is mounted and disposed behind the circuit board 4. The outer case 6 has a through hole 62 at a position facing the speaker 51. The abutting portion 32 does not have a notch portion 32a. The abutting portion 32 (backrest 3) has a protrusion 32b between the nameplate 1. The protrusion 32b is formed in a hemispherical shape and has a height of about 0.2 mm. Thereby, a gap G1 is formed between the nameplate 1 and the abutting portion 32 in the instrument device.

[0039] Conventionally, when the speaker 51 sounds, the vibration of the speaker 5 propagates to the circuit board 4, the vibration of the circuit board 4 propagates to the middle case 2, and the vibration of the middle case 2 propagates to the nameplate 1 and the back plate 3. In this way, when the nameplate 1 and the back plate 3 vibrate, there is a problem that interference repeatedly occurs between the abutting portion 32 of the nameplate 1 and the back plate 3, generating abnormal noise. In particular, when there is an abutting portion 32 at a position facing the speaker 5, there is a problem that the abnormal noise is large.

[0040] According to the present disclosure, by forming a gap G1 between the abutting portion 32 (back plate 3), abnormal noise between the nameplate 1 and the back plate 3 can be reduced.

[0041] In addition, although the instrument device of the present disclosure has been described by taking the configuration of the above-described embodiment as an example, the present disclosure is not limited thereto, and it goes without saying that various improvements and design changes can be made in other configurations without departing from the gist of the present disclosure.

[0042] For example, although the hook 33 of the back plate 3 is locked to the receiving portion 61 of the outer case 6, it may be locked to a receiving portion formed in the middle case 2. In this case, the middle case 2 and the outer case 6 are locked by hooks and receiving portions provided respectively.

Explanation of Reference Numerals

[0043] 1 Nameplate (display board) 11 Indicator portion 12 Window portion 13 Operation / warning portion 2 Middle case (first case member) 3 Back plate (back plate member) 31 Opening 32 Abutting portion 32a Notch portion 32b Protrusion 33 Hook (locking portion) 4 Circuit board 41 Light source 42 Connector 5 Speaker (acoustic member) 5a Speaker-side cord 51 Speaker 6 Outer case (second case member) 61 Receiving part 62 Through-hole 7 Display 71 Display section 71a Predetermined information 72 Boss section 8 Pointer 9 Transparent panel 10 Motor 10a Rotation shaft 100 Pointer display section 200 Information display section 300 Operation / warning lamp G Gap G1 Gap

Claims

1. A plate-shaped display board, a first case member disposed behind the display panel and on which the display panel is placed; An end cover member is disposed in front of the display board and has an opening through which the display board can be viewed; a circuit board disposed behind the first case member; an acoustic member disposed behind the first case member and controlled by the circuit board; The display plate is sandwiched between the first case member and the end cover member, The instrument device according to claim 1, wherein the cover member has a gap between the display panel and the acoustic member at a position opposite the display panel.

2. The inside cover member has a butt portion at the opening that abuts against the display plate, 2. The instrument device according to claim 1, wherein the gap is provided at the abutting portion.

3. 3. The instrument assembly of claim 2, wherein the acoustic member is disposed rearwardly of the circuit board.

4. a second case member disposed behind the circuit board; 4. The instrument assembly of claim 3, wherein the acoustic member is fixed to the second case member.

5. The inside cover member has a plurality of locking portions that lock with the first case member or the second case member, 5. The instrument assembly of claim 4, wherein the acoustic member is disposed between a plurality of the stops.

Images