JP2000016119A - Display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine tachometer which uses electromagnetic waves as a medium and supplies electric power from an alternator to the meter body and also supplies revoling speed pulse signals from an engine speed sensor to the meter body without depending upon wirings, etc. SOLUTION: An engine tachometer is equipped with a meter body 10 installed removably on the upper wall of an instrument panel and a transmitter 20 which transmits the electric power from alternator G to the meter body 10 using electromagnetic waves as a medium and also transmits revolving speed pulse signals to the meter body 10 using infrared rays as a medium. The meter body 10 operates on the basis of the electric power given by the transmitter 20 and displays the engine speed in conformity to the transmitted signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display device for a vehicle.

[0002]

2. Description of the Related Art Conventionally, as exemplified in Japanese Utility Model Laid-Open No. 5-41940, there is a vehicle display device arranged on an instrument panel of a vehicle and in front of a driver's seat. An example of such a vehicle display device is an engine tachometer as shown in FIG.

This engine tachometer includes an interface circuit 1, a liquid crystal drive circuit 2, and a liquid crystal panel 3, as shown in FIG. The interface circuit 1 performs a waveform shaping process on a rotational speed pulse signal from the engine rotational speed sensor S, and outputs a processed signal to the liquid crystal drive circuit 2. The liquid crystal drive circuit 2 drives the liquid crystal panel 3 in a matrix according to the processing signal from the interface circuit 1 based on the power from the alternator G. Then, the liquid crystal panel 3 indicates and displays the engine speed of the vehicle.

[0004]

In the above-described engine tachometer, the supply of electric power from the alternator G to the liquid crystal drive circuit 2 and the supply of a rotational speed pulse signal from the engine rotational speed sensor S to the interface circuit 1 are usually performed. , Using wiring such as a wire harness. However, the use of such wiring is inconvenient because the engine tachometer cannot be freely separated and moved from the engine speed sensor S or the like outside the vehicle, for example.

[0005] In order to cope with such a problem, the present invention uses electromagnetic waves as a medium to supply power from a power supply to a display and to supply information from a vehicle information supply source without depending on wiring or the like. An object of the present invention is to provide a vehicle display device that supplies a vehicle information signal to a display.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a display (10) detachably disposed at an appropriate position in a vehicle compartment of a vehicle, and a power supply (G). (20) for transmitting both the power from the vehicle and the vehicle information signal from the vehicle information supply source (S) to the display using electromagnetic waves as a medium, and the display operates based on the power from the transmitter. The vehicle information is displayed according to the vehicle information signal from the transmitter.

As described above, the supply of the power and the vehicle information signal from the transmitter to the display is performed by using the electromagnetic wave as a medium without depending on the wiring. For this reason, the display can be freely separated and moved from the installation location, which is convenient. According to the second aspect of the present invention, the transmitter may include a transmission unit (23) that transmits a vehicle information signal from a vehicle information supply source using infrared rays as a medium.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an engine tachometer E according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, the engine tachometer E is disposed in a portion of the instrument panel I in front of the handle H. As shown in FIGS. It has a main body 10 and a transmitter 20.

The instrument body 10 has a case 10a as shown in FIG. 1. The case 10a has an instrument panel I on its bottom wall with an adhesive tape.
The upper wall is detachably fixed to a portion in front of the handle H. The meter main body 10 includes a receiving unit 11, an auxiliary power supply 12, a receiving unit 13, a liquid crystal driving circuit 14, and a liquid crystal panel 15 in a case 10a, as shown in FIG. The receiving unit 11 includes a transmitting unit 2 of a transmitter 20 described later.
1 receives electric power from an electromagnetic wave as a medium. Further, the auxiliary power supply 12 stores power from the receiving unit 11.

The receiving section 13 receives a transmission signal (indicating the engine speed of the vehicle as described later) using an infrared ray as an example of an electromagnetic wave from the transmission section 23 of the transmitter 20 as a medium and generates a reception signal. . The liquid crystal drive circuit 14 receives the power from the receiver 11 or the auxiliary power supply 12
The liquid crystal panel 15 is driven in a matrix in accordance with the above-mentioned received signal from. The liquid crystal panel 15 indicates and displays the engine speed.

The transmitter 20 is housed in a concave portion Ia (see FIG. 1) of the instrument panel I. As shown in FIG. An interface circuit 22 is provided. The concave portion Ia is provided in a portion of the upper wall of the instrument panel I facing the bottom wall of the case 10a of the instrument main body 10.

The transmitting section 21 transmits the electric power from the alternator G to the receiving section 11 of the instrument main body 10 using an electromagnetic wave as a medium. The interface circuit 22 performs a waveform shaping process on the rotational speed pulse signal from the engine rotational speed sensor S, and transmits the processed signal to the transmitting unit 23. The transmission unit 23 transmits a transmission signal to the reception unit 13 of the instrument main body 10 using infrared rays as a medium based on the processing signal from the interface circuit 22.

[0013] In this embodiment configured as described above,
The receiver 11 of the instrument main body 10 is a transmitter 21 of the transmitter 20.
Receiving electric power from an electromagnetic wave as a medium. Then, the receiving section 13 of the meter main body 10 receives the transmission signal from the transmission section 23 of the transmitter 20 using the infrared ray as a medium, and outputs the reception signal to the liquid crystal drive circuit 14. Then, the liquid crystal drive circuit 14
Drives the liquid crystal panel 15 in a matrix according to the received signal from the red light receiving unit 13 based on the power from the receiver 11. Therefore, the liquid crystal panel 15 indicates and displays the engine speed.

As described above, the supply of the transmission signal and the power from the transmitter 20 to the meter main body 10 is performed without depending on the wiring such as the wire harness. Therefore, the assemblability between the transmitter 20 and the instrument main body 10 is improved. Further, the instrument main body 10 can be freely separated and moved from the installation place, and it is convenient. (1) The instrument body 10 is taken out of the vehicle when the vehicle is parked, which helps to prevent the instrument body 10 from being stolen. (2) The liquid crystal drive circuit 14 connects the instrument main body 10 to the transmitter 20
It operates based on the power from the auxiliary power supply 12 in a state where it is detached from the power supply. For this reason, it is possible to monitor the engine speed of the vehicle with the instrument main body 10 from the outside of the vehicle as well as the vehicle interior. (3) By adding an operation switch and a signal generator that generates an operation signal using infrared rays as a medium in response to the operation of the operation switch to the instrument main body 10, the operation switch responds to the operation signal from the signal generator. Instrument main unit 1 as a driving device for driving various devices such as an air conditioner or a car audio.
0 can be used.

In this case, it is convenient to operate the above-mentioned various devices not only in the vehicle compartment but also outside the vehicle compartment by operating the operation switch. (4) If the instrument main body 10 is provided with a return signal generator that generates a return signal using a transmission signal from the transmitter 20 using infrared light as a medium, various devices in the vehicle are provided according to the return signal from the return signal generator. Instrument body 10 as a driving device for driving
Can also be used. (5) If various functions such as a pedometer, a sphygmomanometer, a body fat meter, a mobile device, a scheduler, a parking place display device, a personal computer, a game device, or a visible radio are added to the meter main body 10, more various types of devices can be provided. The instrument body 10 can be used for the purpose. (6) If the insect cage or the water tank is integrated with the meter main body 10, it is convenient because the pet is accommodated in the insect cage or the water tank so that the pet can act together with the pet. (7) It is convenient to use the concave portion Ia of the instrument panel I for storing glasses or valuables. (8) If a solar cell is mounted on the instrument body 10 along the front surface and the power generated by the solar cell is stored in the auxiliary power supply 12, the instrument body 10 can be operated regardless of the power from the alternator G. It is convenient.

In the embodiment of the present invention, the transmitting section 20 may be provided at a position other than the position in front of the handle H in the instrument panel I. In this case, the installation location of the meter main body 10 can be changed according to the preference of the operator. In the present embodiment, an example in which the case 10a of the instrument main body 10 is detachably fixed to the upper wall of the instrument panel I with an adhesive tape on the bottom wall has been described. The instrument main body 10 may be detachably fixed to the instrument panel I by fastening with screws.

Further, in addition to the above, one of the instrument main body 10 and the instrument panel I is provided with a mounting claw, and the other is provided with a fitting portion which can be fitted with the mounting claw. The instrument panel I may be detachably fixed to the upper wall. Further, in the present embodiment, an example in which the present invention is applied to the engine tachometer E has been described. However, the present invention is not limited to this. May be applied.

In addition to the above, the present invention may be applied to a display device for displaying an abnormality of a vehicle, a drive position of an automatic transmission, a turn signal, or a state of an air conditioner.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the embodiment.

FIG. 3 is a block diagram showing a circuit configuration of a conventional technique.

[Explanation of symbols]

10: instrument body, 20: transmitter, G: alternator, S
... Rotation speed sensor.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mikio Muramatsu 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. (72) Inventor Shingo Kuwamura 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (reference) 3D044 BA03 BB01 BD01 5G435 BB12 EE13 LL17

Claims (2)

[Claims] 1. An indicator (10) removably disposed in a proper place in a vehicle compartment of a vehicle, and an electromagnetic wave for both electric power from a power source (G) and a vehicle information signal from a vehicle information supply source (S). A transmitter (20) for transmitting to the display as a medium, wherein the display operates based on power from the transmitter and displays vehicle information according to a vehicle information signal from the transmitter. Display device. 2. The vehicle display device according to claim 1, wherein the transmitter has a transmission unit (23) for transmitting the vehicle information signal from the vehicle information supply source using infrared rays as a medium.