JP6350029B2 - Instrument device - Google Patents

Description

  The present invention relates to an instrument device that displays the speed of a moving body, and more particularly to an instrument device that displays the speed of a two-wheeled vehicle.

  Conventionally, an instrument device that displays the speed of a moving body such as a two-wheeled vehicle receives a detection signal from a rotation detector provided on a hub of a front wheel of the two-wheeled vehicle via a wiring cord. The instrument device displays the speed of the two-wheeled vehicle based on the sent detection signal (see, for example, Patent Document 1).

In this conventional instrument device, the rotation detector employs a Hall IC or MR element as a sensor. Since the place where the rotation detector is installed is a hub of a front wheel of a two-wheeled vehicle, a waterproof and dustproof structure has to be applied to protect the sensor, and there is a problem that costs are increased. Thus, there has been an instrument device that has been made paying attention to such a problem (for example, Patent Document 2).
JP-A-9-229714 JP 2008-32615 A

  In a conventional instrument device, a speedometer that displays the speed of the vehicle, a circuit board that is electrically connected to the speedometer, a case that houses the speedometer and the circuit board, and rotation of the speed of the vehicle are transmitted. It is known that a magnet that rotates together with a rotating cable and a Hall IC that detects the rotation of the magnet are provided, and the Hall IC is provided on a circuit board and accommodated in a case.

  In such an instrument device, the magnet is surrounded by a metal cover so that the magnetic field from the magnet does not affect the speedometer, and static electricity charged on the rotating cable is transmitted from the cover to the liquid crystal control line, which is displayed on the liquid crystal display. In order not to adversely affect the liquid crystal, the liquid crystal control line is arranged at a position away from the cover.

  However, the structure in which the rotary cable is arranged apart from the liquid crystal control line has a problem that the degree of freedom in arrangement on the circuit board is impaired.

  Therefore, the present invention has been made paying attention to such a problem, and an object thereof is to provide an instrument device having an improved degree of freedom in arranging components.

An instrument device according to the present invention includes a display that displays a traveling state of a vehicle, a circuit board that is electrically connected to the display, a case that accommodates the display and the circuit board, and rotation of a vehicle speed. comprising a detection object that rotates together with the rotating cable for transmitting a detection unit for detecting the rotation of the body to be detected, the a, provided with the detecting portion to the circuit board, accommodating the detecting portion within the case In the instrument device having a cover that simultaneously accommodates the detection target and the detection unit, the circuit board has a ground pattern formed on a surface of the circuit board opposite to the display , liquid crystal control line is formed on a surface disposed in the display, the ground pattern is provided at a position opposed to the circuit board at least the cover, the liquid crystal control line, the object In which is provided at a position facing the Detai.

Moreover, the said ground pattern is provided in the location facing the front-end | tip of the standing wall of the said cup-shaped cover.

  As described above, according to the instrument device of the present invention, it is possible to provide an instrument device in which the degree of freedom of component placement is improved.

Explanatory drawing of the two-wheeled vehicle carrying the instrument apparatus of the Example of this invention. Sectional drawing of the instrument apparatus of the Example.

  FIG. 1 shows the basic configuration of the present invention, and will be described by taking a two-wheeled instrument device as a moving body as an example.

  The two-wheeled vehicle 1 includes a frame 2 made of metal such as aluminum, an internal combustion engine (engine) 3 that uses gasoline as fuel, a fuel tank 4 that stores gasoline, a seat 5 on which a driver of the two-wheeled vehicle 1 sits, and a front wheel 6. And two front forks 7 that rotatably hold the front wheel 6, an instrument device 8, and a rotating cable 9 that transmits the rotation of the front wheel 6 to the instrument device 8. The engine 3, the fuel tank 4, and the seat 5 are attached to the frame 2, and the two front forks 7 are attached to the frame 2 so as to be steerable to the left and right.

  Next, the instrument device 8 will be described with reference to FIG. The instrument device 8 includes a speedometer 10 that displays the speed of the motorcycle 1, a liquid crystal display 11 that displays a travel distance of the motorcycle 1, and a circuit board 12 that is electrically connected to the speedometer 10 and the liquid crystal display 11. , A case 13 for housing the speedometer 10, the liquid crystal display 11 and the circuit board 12, a magnet 14 that is a detected object that rotates together with the rotating cable 9 that transmits the rotation of the front wheel, which is the rotation of the vehicle speed A Hall IC 15 serving as a detection unit for detecting the rotation of the magnet 14 is provided. The magnet 14 and the Hall IC 15 are accommodated by a cover 40. Reference numeral 16 denotes a dial, and reference numeral 17 denotes a control unit that controls the speedometer 10 and the liquid crystal display 11.

  The speedometer 10 is a pointer-type meter provided with a pointer 18. The speedometer 10 includes, in addition to the pointer 18, a dial plate 16 having scales and characters (not shown) indicated by the pointer 18, and an instrument body 19 that rotationally drives the pointer 18.

  The dial 16 includes a through hole 20 and a window portion 21. The through-hole 20 passes through the rotary shaft 22 that connects the pointer 18 and the instrument body 19.

  The instrument main body 19 includes a cross coil instrument main body, a stepping motor, and the like, and is driven by a drive process of the control unit 17.

  The liquid crystal display 11 may display the remaining fuel amount, the engine coolant temperature, the time, and the like in addition to the travel distance described above. The liquid crystal display 11 includes a liquid crystal display element 23, a support 24 that holds the liquid crystal display element 23, and a wiring member 25 that electrically connects the liquid crystal display element 23 and the circuit board 12. Reference numeral 26 denotes a light source that illuminates the liquid crystal display element 23 from behind, and for example, a light emitting diode is preferable.

  The support 24 is made of a white synthetic resin and has a box shape to support the liquid crystal display element 23 and to form a space for making the light of the light emitting diode 26 uniform.

  The wiring member 25 has conductivity such as conductive rubber. The wiring member 25 supplies an electric signal from the circuit board 12 to the liquid crystal display element 23.

The liquid crystal control line 121 is wired on the surface of the circuit board 12, one is electrically connected to the wiring member 25, and the other is electrically connected to the control unit 17 provided on the circuit board 12 by a wiring pattern (not shown). The

  The case 13 includes a back case 13a and a front cover 13b. The back case 13a and the front cover 13b are assembled so as to perform waterproof and dustproof functions for a motorcycle. In addition, it is not a complete sealing structure, and it is possible to ventilate the air inside and outside the case 13 by providing a filter (not shown) that does not transmit water but transmits gas. The back case 13 a does not transmit light, and is made of, for example, black synthetic resin, and forms the back side of the instrument device 8. The front cover 13b is made of a synthetic resin that transmits light, and is colorless in this embodiment. The front cover 13 b forms the front side of the instrument device 8.

  The magnet 14 has a disk shape, and a rotating shaft 28 passes through the center thereof. The magnet 14 rotates with the rotating shaft 28. The magnet 14 is magnetized, and a plurality of N poles and S poles are provided in the radial direction around the rotation center. In the present embodiment, the N pole and the S pole are combined to provide eight magnetic poles.

  The rotary shaft 28 is made of metal, and is rotatably supported by the back case 13a by a bearing 29. A recess 28a is provided on the side of the rotating shaft 28 opposite to the side on which the magnet 14 is provided. The end 9a of the rotary cable 9 is inserted into the recess 28a. The recess 28a has a quadrangular cross-sectional shape in the direction perpendicular to the longitudinal direction, and the end 9a inserted into the recess 28a also has a shape matching the recess 28a. The rotation of the rotary cable 9 is transmitted to the rotary shaft 28, and the rotary shaft 28 rotates. The bearing 29 is also made of metal and has a cylindrical shape. The bearing 29 includes a groove 30 on the outer periphery, and the back case 13a is fitted in the groove 30 and the bearing 29 is fixed to the back case 13a. Reference numeral 31 denotes a retaining ring which has a metal donut shape and prevents the rotating shaft 28 from coming off the bearing 29.

  The Hall IC 15 serving as a detection unit is mounted on the circuit board 12 and is electrically connected to a wiring pattern (not shown) provided on the circuit board 12. The Hall IC 15 includes a Hall element 15a and a protective portion 15b made of a synthetic resin. The protection unit 15b covers the hall element 15a in order to protect the hall element 15a. The Hall element 15a is a kind of sensor using a semiconductor and detects magnetism. In this embodiment, the rotation of the magnet 14 is detected by detecting the change in the magnetic field accompanying the rotation of the magnet 14.

Control unit 17 is an integrated circuit such as IC, it is mounted on the circuit board 12, and is electrically a wiring pattern provided on the circuit board 12 connected. The control unit 17 includes a circuit unit 17a that is a main unit and a protection unit 17b that protects the circuit unit 17a. The protection unit 17b covers the circuit unit 17a in order to protect the circuit unit 17a.

  The cover 40 is a metal cup-shaped enclosure member, and the rotation shaft 28 passes through the center thereof. The cover 40 has an opening composed of a disc-shaped bottom and a cylindrical standing wall. The cover 40 is held on the rotation shaft 28. The cover 40 is a magnetic metal that attenuates the magnetic field from the magnet 14, and prevents malfunction of the speedometer 10 due to magnetic interference from the magnet 14 to the instrument body 19. The cover 40 accommodates the magnet 14 and the Hall IC 15 inside thereof.

A ground pattern 122 is formed on the surface (back surface) of the circuit board 12 where the liquid crystal display 11 is not disposed. The ground pattern 122 is for discharging static electricity from the cover 40 to the ground pattern 122 so that static electricity is not induced to the liquid crystal control line 121 on the surface (surface) on which the liquid crystal display 11 is disposed. Further, the ground pattern 122 is formed on the back surface of the circuit board 12 with a gap at a location facing the cover 40 (the tip of the standing wall). The ground pattern 122 only needs to face at least a part of the cover 40 so as not to contact the cover 40 and to have a slight gap. The size and shape of the ground pattern 122 and the ground pattern 122 from the cover 40 to the ground pattern 122 are sufficient. The gap can be changed as appropriate.

As described above, the magnet 14 and the Hall IC 15 are accommodated in the cover 40, the ground pattern 122 is formed on the back surface of the circuit board 12, and the ground pattern 122 faces at least a part of the cover 40. Since the cover 40 can be opposed to the pattern 122 to discharge static electricity, there is no need to dispose the liquid crystal control line 121 at a position away from the cover 40, and the instrument device 8 with improved freedom of component placement is provided. Can do.

In addition, since the ground pattern 122 is provided at a position facing the cover 40, the magnet 14 and the liquid crystal display 11 can be disposed on the back surface via the circuit board 12, so that the ground pattern 122 is located away from the cover 40. There is no need to dispose the liquid crystal control line 121 having a weak electric signal, and the instrument device 8 with an improved degree of freedom of component placement can be provided.

8 Instrument device 9 Rotating cable 10 Speedometer (indicator)
11 Liquid crystal display (display)
12 Circuit board 13 Case 14 Magnet (detected body)
15 Hall IC (detector)
15a Hall element 17 Control unit 40 Cover 121 Liquid crystal control line 122 Ground pattern

Claims (2)

An indicator that displays the driving status of the vehicle;
A circuit board electrically connected to the display;
A case for housing the indicator and the circuit board;
A detected object that rotates together with a rotating cable that transmits rotation of the vehicle speed;
And a detector for detecting the rotation of the body to be detected,
While providing the detection unit on the circuit board, the detection unit is accommodated in the case,
In an instrument device having a cover that simultaneously accommodates the detected object and the detection unit,
The circuit board has a ground pattern formed on a surface of the circuit board opposite to the display, and a liquid crystal control line is formed on the surface of the circuit board where the display is disposed.
The ground pattern is provided at a position facing at least the circuit board of the cover ,
The liquid crystal control line is provided at a position facing the object to be detected . The ground pattern, the meter device according to claim 1, characterized in that provided at a position facing the tip end wall section of the cover of the mosquito-up form.

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