JP6544102B2 - Display device for motorcycles - Google Patents

Description

  The present invention relates to a display device.

  Conventionally, as a display device for a vehicle, for example, as disclosed in Patent Document 1, an atmospheric pressure detection unit for detecting an atmospheric pressure is provided, and based on the detection result of the atmospheric pressure detection unit in addition to vehicle information such as vehicle speed. It is known to display elevation values.

Japanese Utility Model Application Publication No. 4-102420

  Generally, in a display device for a vehicle, various sensors such as the air pressure detection unit described in Patent Document 1 are mounted on a circuit board and then incorporated in a case. As described above, since the air pressure detection unit is built in the case, although the air pressure inside the case can be detected, there is a possibility that the atmospheric pressure outside the case can not be detected with high accuracy.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a display device which detects the atmospheric pressure outside the case more accurately.

In order to achieve the above object, a display device for a motorcycle according to the present invention is provided on a display unit for displaying information on the front side, a circuit board whose front surface faces the back surface of the display unit, and a back surface of the circuit board An atmospheric pressure detection sensor for detecting an atmospheric pressure, and a case in which the display unit and the circuit board are accommodated, and the case includes an inner space of the case at a position facing the atmospheric pressure detection sensor. And a vent communicating with the outside space, and the vent is closed by a porous member.

  According to the present invention, the atmospheric pressure outside the case can be detected more accurately.

It is a front view of a display concerning one embodiment of the present invention. (A) which concerns on one Embodiment of this invention is the sectional view on the AA line of FIG. 1, Comprising: (b) is the elements on larger scale of (a). It is a block diagram which shows the electric constitution of the display apparatus which concerns on one Embodiment of this invention.

  An embodiment of a display device according to the present invention will be described with reference to the drawings.

  The display device 10 is mounted on a motorcycle and, as shown in FIG. 1, indicates vehicle information such as the traveling speed of the motorcycle, engine speed, remaining fuel amount, and the altitude at which the motorcycle is located. The screen is displayed on the liquid crystal panel 20a. The driver can recognize the vehicle information and the altitude through visual recognition of the liquid crystal panel 20a.

  In this specification, the horizontal direction of the liquid crystal panel 20a viewed from the driver is defined as the X direction, the vertical direction of the liquid crystal panel 20a is defined as the Y direction, and the direction orthogonal to the X direction and the Y direction is the Z direction. Define as Further, in the present specification, “upper”, “lower”, “front” and “back” all refer to positions viewed from the driver.

(Mechanical configuration of display device)
Specifically, as shown in FIG. 2A, the display device 10 includes a display unit 20, a circuit board 40, and a case 30 made of resin and accommodating the display unit 20 and the circuit board 40.

  The case 30 has a back case 33 located on the back side of the display device 10, a front case 31 fitted to the back case 33 from the front side, and a middle case 32 located in the inner space of the fitted back case 33 and front case 31. And. The back case 33 is formed in a box shape opened toward the front side (the front case 31 side), and includes a substantially rectangular bottom plate 33 c.

  The circuit board 40 is formed in a rectangular plate shape and installed inside the back case 33. The circuit board 40 faces the bottom plate 33 c of the back case 33 with a predetermined distance. As shown in FIG. 2B, the bottom plate 33c of the back case 33 is formed with a ventilation wall portion 33a extending from the bottom plate 33c to the front side. The ventilating wall portion 33 a is, for example, formed in a cylindrical shape whose diameter decreases toward the front side, and is located on the upper side of the bottom plate 33 c of the back case 33. The ventilation wall portion 33a may have any shape as long as it has a cylindrical shape corresponding to an atmospheric pressure detection sensor 41 described later. For example, the ventilation wall portion 33a may have an elliptical cylindrical shape, a rectangular cylindrical shape, or a polygonal cylindrical shape. In the inside of the ventilation wall portion 33a, a ventilation hole 33b is formed to connect between the internal space and the external space of the case 30. As described above, by forming the ventilation wall portion 33a, an external space can be formed inside the case 30. A porous member 35 is attached to the tip of the ventilation wall 33a so as to close the ventilation hole 33b. The porous member 35 is, for example, a waterproof and moisture-permeable air-permeable filter formed in a sheet shape made of polytetrafluoroethylene resin, which is a type of a fluorocarbon resin porous film.

  Further, in the bottom plate 33c of the back case 33, apart from the air vents 33b, cable insertion holes 33d which penetrate the bottom plate 33c in the thickness direction are formed. The cable insertion hole 33 d is located at the lower end of the bottom plate 33 c of the back case 33.

  The atmospheric pressure detection sensor 41, the time measuring unit 42, the control unit 43, and the connector 44 are mounted on the back surface of the circuit board 40 (the surface facing the bottom plate 33c of the back case 33) in order from the upper side to the lower side ing. The control unit 43, the atmospheric pressure detection sensor 41, the timer unit 42, and the connector 44 are electrically connected to each other through printed wiring on the back surface of the circuit board 40. The atmospheric pressure detection sensor 41 is positioned on the upper side of the back surface of the circuit board 40 so as to be opposed to the vent holes 33 b of the back case 33. In other words, as viewed in the Z direction, the atmospheric pressure detection sensor 41 is positioned so as to overlap the vent 33b (vent wall 33a). Further, the atmospheric pressure detection sensor 41 faces the porous member 35 with a slight gap in the Z direction. In addition, the light detection unit 48 is mounted on the surface of the circuit board 40. The light detection unit 48 is located at the lower end of the surface of the circuit board 40. The connector 44 is located at the lower end of the back surface of the circuit board 40. A cable 46 is connected to the connector 44. The cable 46 is connected to a vehicle (exactly, an ECU 60 described later) through a cable insertion hole 33 d formed in the bottom plate 33 c of the back case 33. A seal member 45 is provided between the cable 46 and the cable insertion hole 33 d to fill the gap therebetween. The function of each element mounted on the circuit board 40 will be described in detail later.

  The middle case 32 is located inside the back case 33 and on the front side of the circuit board 40. The middle case 32 has a box shape open toward the front side. The display unit 20 is housed in the middle case 32 with the liquid crystal panel 20 a exposed to the front side. The distance between the circuit board 40 and the display unit 20 is determined by the middle case 32.

  The front case 31 is formed in a box shape opened toward the back side (the rear case 33 side), and includes a substantially rectangular ceiling plate 31 a located on the front side. The front case 31 is fitted to the back case 33 in a state in which the middle case 32 is sandwiched from the Z direction with the back case 33. Between the front case 31 and the back case 33, a seal member 47 is disposed which suppresses the entry of water, dust or the like into the inside of the case 30. In the ceiling plate 31 a of the front case 31, a rectangular through hole 31 b penetrating in the thickness direction of the ceiling plate 31 a is formed. A translucent cover glass 39 is fitted in the through hole 31 b of the front case 31. Light representing an image from the liquid crystal panel 20 a of the display unit 20 is transmitted to the cover glass 39.

  Further, the front case 31 is formed with a light guiding cylindrical portion 31 c having a through hole extending in the Z direction. The light guide tube portion 31 c is located on the side of the display unit 20. The light guide tube portion 31c is closed through a translucent resin cover 38 located on the front side of the light guide tube portion 31c. The translucent resin cover 38 is formed of, for example, a translucent acrylic resin, and suppresses the penetration of liquid or dust into the display device 10 from the outside. The rear end of the light guide tube portion 31 c is positioned to face the light detection portion 48. According to this configuration, the outside light enters the inside of the light guide cylindrical portion 31 c through the translucent resin cover 38 and then enters the light detection portion 48.

(Electric configuration of display device)
As shown in FIG. 3, the display device 10 includes an atmospheric pressure detection sensor 41, a timer unit 42, a control unit 43, a light detection unit 48, and a display unit 20. The timer unit 42 is, for example, a real-time clock, measures time by periodic vibration of a quartz oscillator, and outputs the measured time to the control unit 43. The display unit 20 includes a liquid crystal panel 20a and a light source 20b that illuminates the liquid crystal panel 20a from the back. The atmospheric pressure detection sensor 41 detects an atmospheric pressure, and based on the temperature detected by the atmospheric pressure detection unit 41a configured by, for example, a thermistor, a temperature detection unit 41b that detects a temperature, and the temperature detection unit 41b, And a correction unit that corrects the atmospheric pressure detected by the atmospheric pressure detection unit. The atmospheric pressure detection sensor 41 is configured such that the atmospheric pressure detection unit 41a, the temperature detection unit 41b, and the correction unit 41c are covered by one package. The atmospheric pressure detection sensor 41 outputs the corrected atmospheric pressure and the temperature detected through the temperature detection unit 41 b to the control unit 43. The light detection unit 48 is, for example, a phototransistor, and outputs the detected light intensity to the control unit 43 as an electric signal.

  The control unit 43 is, for example, a microcomputer, and controls the entire display device 10. The control unit 43 is electrically connected to the light detection unit 48, the timer unit 42, the atmospheric pressure detection sensor 41, and the display unit 20. The control unit 43 is also electrically connected to an ECU (Electronic Control Unit) 60 mounted on the motorcycle via a cable 46. The control unit 43 can exchange information with the ECU 60 through a controller area network (CAN). Specifically, the control unit 43 receives vehicle information such as the vehicle speed from the ECU 60 and transmits information related to the corrected atmospheric pressure to the ECU 60. The ECU 60 performs fuel injection amount control of the engine in consideration of the corrected air pressure.

  The control unit 43 calculates the altitude based on the corrected atmospheric pressure. The control unit 43 displays the calculated altitude and the vehicle information from the ECU 60 (for example, the traveling speed of the vehicle, the number of engine rotations, etc.) on the liquid crystal panel 20a.

  The control unit 43 uses the temperature detected by the temperature detection unit 41 b of the atmospheric pressure detection sensor 41 as the use environmental temperature in the case 30 to correct the time measured by the timer unit 42. Thus, even if the vibration frequency of the quartz oscillator contained in the timekeeping unit 42 changes with temperature change, the control unit 43 can perform control based on the correct time after correction.

  In addition, the control unit 43 reduces the brightness of the light source 20b of the display unit 20 or turns off the light source 20b when the temperature detected by the temperature detection unit 41b of the atmospheric pressure detection sensor 41 is equal to or higher than the threshold. Perform processing (derating processing). Thereby, it is suppressed that the temperature of the display apparatus 10 becomes high too much by the light from the light source 20b. Here, an error occurs in the illuminance detected by the light detection unit 48 depending on the operating environment temperature. Therefore, the control unit 43 corrects the illuminance detected by the light detection unit 48 based on the temperature detected by the temperature detection unit 41b of the atmospheric pressure detection sensor 41, and adjusts the brightness of the light source 20b based on the corrected illuminance. Do. Specifically, the control unit 43 increases the luminance of the light source 20b as the corrected illuminance increases. Thereby, the visibility of the liquid crystal panel 20a is secured regardless of the brightness around the display device 10.

(effect)
According to the embodiment described above, the following effects can be obtained.

  (1) The display device 10 has a display unit 20 for displaying vehicle information and altitude, an atmospheric pressure detection sensor 41 for detecting atmospheric pressure, and a case 30 in which the display unit 20 and the atmospheric pressure detection sensor 41 are accommodated. Prepare. In the case 30, a vent 33 b communicating between the internal space and the external space of the case 30 is formed at a position facing the atmospheric pressure detection sensor 41. The air vents 33 b are closed by the porous member 35. According to this configuration, the atmospheric pressure detection sensor 41 detects the atmospheric pressure outside the display device 10 through the vent 33b located opposite to itself. For this reason, the atmospheric pressure detection sensor 41 is hard to be affected by the internal environment of the case 30, and the atmospheric pressure outside the case 30 can be detected more accurately. Since the air holes 33 b are closed by the porous member 35, the outside air can be taken into the internal space of the case 30, and entry of water or dust into the internal space of the case 30 is suppressed. In particular, in the above embodiment, since the display device 10 is mounted on a motorcycle, the display device 10 is easily exposed to rain, wind and dust, but the penetration thereof can be suppressed by the porous member 35.

  (2) The display device 10 includes the circuit board 40 located on the back side of the display unit 20. An atmospheric pressure detection sensor 41 is provided on the back surface of the circuit board 40 at a position facing the vent 33b. In addition, the case 30 includes a bottom plate 33 c facing the circuit board 40 and a cylindrical ventilation wall 33 a extending from the bottom plate 33 c toward the atmospheric pressure detection sensor 41. An air vent 33b penetrating in the thickness direction of the bottom plate 33c is formed in the air vent wall portion 33a. The porous member 35 is located on the tip side of the ventilation wall 33a. By forming the ventilation wall portion 33a, as shown in FIG. 2B, the ventilation hole 33b can be formed at a position near the atmospheric pressure detection sensor 41. The inside of the vent 33b is connected to the external space of the display device 10 to form a part of the external space, so the external space of the display device 10 can be formed at a position near the atmospheric pressure detection sensor 41. As a result, the atmospheric pressure detection sensor 41 can detect the atmospheric pressure in the external space of the case 30 located closer to it more accurately.

  (3) The atmospheric pressure detection sensor 41 uses the atmospheric pressure detection unit 41a based on the temperature detected by the atmospheric pressure detection unit 41a that detects the atmospheric pressure, the temperature detection unit 41b that detects the temperature, and the temperature detection unit 41b. And a correction unit that corrects the detected atmospheric pressure. According to this configuration, it is not necessary to provide the temperature detection unit and the correction unit separately from the atmospheric pressure detection sensor 41, and the display device 10 can be configured more simply.

  (4) The display device 10 includes a clock unit 42 that measures time, and a control unit 43 that corrects the time measured by the timer 42 based on the temperature detected by the temperature detection unit 41 b of the atmospheric pressure detection sensor 41; Equipped with According to this configuration, since the temperature detection unit 41b of the atmospheric pressure detection sensor 41 is used to correct the time measured by the timer unit 42, it is not necessary to newly provide a temperature detection unit. Therefore, the display device 10 can be configured more simply.

  (5) The display unit 20 includes the light source 20b that emits illumination light to the vehicle information and the altitude displayed on the liquid crystal panel 20a. The display device 10 corrects the illuminance detected by the light detection unit 48 based on the temperature detected by the light detection unit 48 that detects the illuminance of the light from the light source 20 b and the temperature detection unit 41 b of the atmospheric pressure detection sensor 41. And a control unit 43 that adjusts the luminance of the light source 20b based on the corrected illuminance. According to this configuration, since the temperature detection unit 41b of the atmospheric pressure detection sensor 41 is used to correct the illuminance detected by the light detection unit 48, it is not necessary to newly provide a temperature detection unit. Therefore, the display device 10 can be configured more simply.

(Modification)
In addition, the said embodiment can be implemented in the following forms which changed this suitably.

  The positions of the ventilation wall portion 33a and the ventilation holes 33b are not limited to the above embodiment, and can be appropriately changed according to the position of the atmospheric pressure detection sensor 41. For example, the ventilation wall 33 a and the ventilation hole 33 b may be formed on the side wall of the back case 33 or may be formed on the front case 31.

  The ventilating wall portion 33a in the above embodiment extends from the bottom plate 33c of the back case 33 to the front side, but may extend from the bottom plate 33c of the back case 33 to the back side. Moreover, although the porous member 35 was provided in the front-end | tip of the ventilation wall part 33a, you may be provided in the proximal end of the ventilation wall part 33a. In this case, the atmospheric pressure detection sensor 41 may be installed in the ventilation wall 33a, that is, in the ventilation hole 33b. Also, the ventilation wall 33a may be omitted. In this case, a vent is formed in the bottom plate 33 c of the back case 33, and the vent is closed by the porous member 35.

  In the above embodiment, the porous member 35 is formed of a polytetrafluoroethylene resin in a sheet shape, but any material may be used as long as it is a waterproof and moisture-permeable air-permeable filter. For example, the porous member 35 may be formed in the shape of a plate provided with a plurality of air holes by the same resin as the case 30. In this case, the porous member 35 may be made of resin integrally with the back case 33.

  The light detection unit 48, the timing unit 42, and the control unit 43 in the above embodiment may be omitted as appropriate. When the light detection unit 48 is omitted, the light guide cylinder 31 c and the translucent resin cover 38 can also be omitted. Furthermore, the light source 20b may be omitted. Further, the control unit 43 may be provided not only inside the case 30 but also outside the case 30.

  Although the atmospheric pressure detection sensor 41 includes the temperature detection unit 41 b in the above embodiment, the temperature detection unit 41 b may be provided separately from the atmospheric pressure detection sensor 41. Similarly, although the atmospheric pressure detection sensor 41 includes the correction unit 41c, the correction unit 41c may be provided separately from the atmospheric pressure detection sensor 41. Further, the temperature detection unit 41b and the correction unit 41c may be omitted.

  In the above embodiment, the case 30 includes the back case 33, the front case 31, and the middle case 32, but the case 30 can accommodate the circuit board 40, the display unit 20, and the like. It is not limited to this configuration.

  In the above embodiment, the display unit 20 is a so-called digital display device including the liquid crystal panel 20a. However, the present invention is not limited to this, and may be an analog display device.

  In the above embodiment, the control unit 43 displays the altitude through the display unit 20. However, the corrected air pressure may be displayed instead of the altitude or together with the altitude.

  In the above-mentioned embodiment, although display 10 was carried in a motorcycle, it may be carried in a car, a plane, a ship, etc.

DESCRIPTION OF SYMBOLS 10 ... Display apparatus 20 ... Display part 20a ... Liquid crystal panel 20b ... Light source 30 ... Case 31 ... Front case 31a ... Ceiling board 31b ... Through hole 31c ... Light guide cylinder part 32 ... Middle case 33 ... Back case 33a ... Aeration wall part 33b ... Ventilation holes 33c-Bottom plate 33d-Cable insertion holes 35-Porous member 38-Translucent resin cover 39-Cover glass 40-Circuit board 41-Atmospheric pressure detection sensor 41a-Atmospheric pressure detection portion 41b-Temperature detection portion 41c-- Correction part 42 ... Time measurement part 43 ... Control part 44 ... Connector 45 ... Seal member 46 ... Cable 47 ... Seal member 48 ... Light detection part 60 ... ECU

Claims (5)

A display unit that displays information on the front side ;
A circuit board whose surface is opposite to the back surface of the display unit;
An atmospheric pressure detection sensor provided on the back surface of the circuit board for detecting atmospheric pressure;
And a case in which the display unit and the circuit board are accommodated.
In the case, an air vent communicating between the inner space and the outer space of the case is formed at a position facing the atmospheric pressure detection sensor,
The vent is closed by a porous member,
A display device for a motorcycle , characterized in that Before Symbol case,
A bottom plate facing the circuit board;
The vent hole is formed in the inside, and a cylindrical vent wall portion extending from the bottom plate to the atmospheric pressure detection sensor;
The porous member is located on the tip side of the ventilation wall portion,
A display device for a motorcycle according to claim 1, characterized in that. The atmospheric pressure detection sensor
An atmospheric pressure detection unit that detects atmospheric pressure;
A temperature detection unit that detects a temperature;
And a correction unit configured to correct the atmospheric pressure detected by the atmospheric pressure detection unit based on the temperature detected by the temperature detection unit.
The display device for a motorcycle according to claim 1 or 2, characterized in that: Timekeeping unit which measures time,
A control unit that corrects the time measured by the timer unit based on the temperature detected by the temperature detection unit of the atmospheric pressure detection sensor;
A display device for a motorcycle according to claim 3, characterized in that. The display unit includes a light source that emits illumination light to the displayed information;
The display device for a motorcycle is:
A light detection unit that detects the illuminance of light from the light source;
And a control unit that corrects the illuminance detected by the light detection unit based on the temperature detected by the temperature detection unit of the atmospheric pressure detection sensor, and adjusts the luminance of the light source based on the corrected illuminance. ,
The display device for a motorcycle according to claim 3 or 4, characterized in that:

Images