JP5013178B2 - Vehicle display device - Google Patents

Description

  The present invention relates to a vehicular display device that performs lighting control of a light source provided on a circuit board by switching an on / off state of a switch unit composed of a transistor or the like, and performs a display to be notified to a vehicle user.

  Conventionally, various vehicles are equipped with a vehicle display device as described in, for example, Patent Document 1 below, and the vehicle display device includes a pointer-type display unit including a speedometer, a fuel meter, and the like. A plurality of indicators for displaying various types of notification information are provided. Each of these pointer-type display units and indicators are usually provided with corresponding light sources, and when the surroundings are dark, such as at night, the light sources should be turned on to illuminate each of the pointer-type display units or make notifications The light source is turned on to illuminate the indicator when the situation is reached.

  That is, each needle-type display unit is attached to a rotating shaft provided in the instrument movement and operates in accordance with the output of the speed sensor or the fuel sensor, and an indicator such as a scale or a number to be indicated by the pointer. And a plurality of light sources corresponding to the pointers and the display board are mounted on the circuit board.

  On the other hand, the indicator is composed of an indicator plate disposed between the display plates, and a plurality of predetermined notification marks made of a light transmissive material are formed adjacent to each other so as to form a row. A plurality of indicator light sources corresponding to the notification marks are mounted adjacent to each other on the circuit board so as to form a row, and there is a situation in which notification should be performed according to signals from various sensors such as a vehicle speed sensor and a fuel sensor. When it is turned on, a notification mark is emitted and displayed.

This is because when the detection signals (predetermined input signals) from various sensors such as a vehicle speed sensor and a fuel sensor are input to the control means, the control means determines the predetermined signals based on the input signals from these sensors. When a calculation process is performed and it is determined from the calculation process result that the indicator should be notified, a control signal for turning on the light source for the indicator is output to the switch means such as a transistor, and is output to the switch means It means that a display to be notified to the user of the vehicle is performed on the indicator plate by controlling lighting of a predetermined indicator light source based on the control signal.
Japanese Patent Laid-Open No. 11-59227

  By the way, in such a vehicle display device, for example, there may be a change in design specifications (that is, a new model design) in which only the design of each notification mark in the indicator differs depending on the destination. In this case, for example, due to a change in design specifications, the lighting of a front fog lamp requiring low brightness from an overspeed indicator indicating that the design of a certain indicator requires excessive travel speed (alarm information) is less urgent than the alarm information. When it is changed to the front fog indicator indicating normal operation information), it is necessary to newly add circuit components for brightness adjustment, etc., so a dedicated circuit board is separately designed for each design specification. It was.

Furthermore, when adding circuit components for brightness adjustment to cope with the brightness change in this way, the electrical noise level radiated from the dedicated circuit board designed by changing the design specifications is harmless. The circuit board product evaluation work for reducing the circuit board to a certain level must be performed for each design specification. As a result, the circuit board design work and the product evaluation work require a huge amount of man-hours. It was the cause of up.
SUMMARY OF THE INVENTION In order to address the above-described problems, the present invention aims to provide a display device for a vehicle that can simplify circuit board design work and product evaluation work and achieve cost reduction. .

The present invention provides a display device for a vehicle that performs light emission control of a light source provided on a circuit board by switching an on / off state of a switch means, and performs a display to be notified to a user of the vehicle. Is a first connection land that can connect a power source and the light source, and a constant voltage circuit that is connected in parallel to the first connection land and that outputs a power source voltage supplied from the power source as a predetermined constant voltage. the light source and the provided second connection land that allows connection, said first, second and one of the possible implementations of the resistive element to the connection land configuration of the connection lands, said resistor element It has a function of adjusting a current value supplied to the light source .

  According to the present invention, it is possible to provide a display device for a vehicle that can achieve an initial purpose, simplify circuit board design work and product evaluation work, and achieve cost reduction.

  Hereinafter, an embodiment of a display device for a vehicle according to the present invention will be described with reference to the accompanying drawings. 1 is a front view of the vehicular display device according to the present embodiment, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a block diagram showing an indicator control circuit according to the present embodiment.

  In FIG. 1, the vehicle display device according to the present embodiment includes, for example, a pointer-type display unit D1 including a speedometer that displays vehicle speed as vehicle information, a pointer-type display unit D2 including a tachometer that displays engine speed, It is arrange | positioned between each pointer type | formula display parts D1 and D2, and is provided with the indicator D3 which displays various alarm information and alerting | reporting information.

  As shown in FIG. 2, each of the pointer-type display units D1 and D2 is mounted on a rotating shaft M1 provided in the instrument movement M, and rotates according to the output of a speed sensor or a rotation sensor mounted on the vehicle. 1 and a display board 2 on which indicators D11 (see FIG. 1) such as scales, characters, marks and the like to be indicated by the pointer 1 are formed, and behind the pointer 1 and the display board 2, A plurality of light sources 3 and 4 corresponding to each are arranged. In this case, the pointer 1 is formed of a light transmissive material that can receive and emit light when the light source 3 is turned on, and the indicator portion D11 of the display panel 2 emits light when the light source 4 is turned on and receives the irradiation light. It is made of a light transmissive material.

  The indicator D3 includes an indicator plate 5 disposed between the display plates 2. A plurality of predetermined warning marks and notification marks (not shown) made of a light-transmitting material are arranged on the indicator plate 5 in a row. A plurality of light sources 6 corresponding to each alarm mark and each notification mark are arranged adjacently behind each other, and signals from various sensors such as the vehicle speed sensor, hydraulic sensor, fuel sensor (described later) The alarm mark or notification mark is lit and displayed to the vehicle user.

  Each light source 3, 4, 6 is made of a light emitting diode that emits light in a predetermined color, for example, and is mounted (mounted) on the front side of the rigid circuit board 7 located behind each display plate 2 and indicator plate 5. The lighting power is supplied through the circuit board 7. In the present embodiment, light emitting diodes are used as the light sources 3, 4, and 6, but all or part of them may be replaced with filament bulbs. An instrument movement M is mounted on the back side of the circuit board 7 provided with the light sources 3, 4, 6, and driving power is supplied through the circuit board 7.

  Further, on the front side of the circuit board 7, a case body 8 made of, for example, a white light-shielding synthetic resin and having a reflector and frame body function is provided. A plurality of illumination chambers for accommodating the light 6 and guiding the light toward the display plate 2 and the indicator plate 5 are formed.

  Further, a protective cover 9 made of a transparent synthetic resin is disposed in front of the pointer type display portions D1 and D2 and the indicator D3.

  Next, a control circuit for controlling light emission / non-light emission of a predetermined indicator 10 (see FIG. 1) located at the upper center of the indicator D3 in the vehicle display device of the present embodiment will be described with reference to FIG. To do. In addition, this indicator 10 shall be an indicator which alert | reports to the user of the said vehicle that the running speed of a vehicle is exceeded, for example (detailed illustration is abbreviate | omitted).

  The control circuit is provided on the circuit board 7, and includes a control means 11, a transistor (switch means) 12, a light source 13, a limiting resistor 14, a first connection land 15, and a second connection land 16. The constant voltage circuit 17 is provided. Further, the control circuit includes a connection member 18 made of a jumper wire or the like mounted on either one of the first and second connection lands 15 and 16.

  For example, a microcomputer can be applied to the control unit 11 and connected to a device such as a CAN (Controller Area Network) communication cable or an ignition switch, and input signals (pulse signals) output from the various sensors are input. Based on the above, a control signal for controlling the on / off state of the transistor 12 is generated and output to the transistor 12. The control means 11 includes a CPU for performing arithmetic processing based on the input signal, a readable / rewritable RAM for temporarily storing arithmetic processing results and the like in the CPU, and a ROM for storing a control program and the like. A storage unit configured, and an input / output interface connected by a bus for exchanging the input signal and the control signal.

  The transistor 12 serves as switch means for controlling light emission of the light source 13 by switching the on / off state in accordance with the control signal. The collector side is connected to the cathode side of the light source 13, and the emitter side is grounded. Grounded to the level, the base side is connected to the output section of the control means 11.

  The light source 13 is one of the plurality of light sources 6 described above, and is mounted on the circuit board 7 corresponding to (facing) the indicator 10 (see FIGS. 1 and 2). To the ground level.

  When the connection member 18 is mounted on the first connection land 15, the light source 13 is connected to the battery (power source) 19 on the anode side via the limiting resistor 14 and the connection member 18, and the connection member 18 is the second. In this case, the anode side is connected to the battery (power source) 19 via the limiting resistor 14, the connecting member 18 and the constant voltage circuit 17.

  The limiting resistor 14 includes a resistance element such as a chip resistor for adjusting (setting) a current value supplied to the light source 13, and is connected to the anode side of the light source 13.

  The first connection land 15 is formed of a pair of lands that are pattern-printed in a shape capable of mounting the connection member 18 such as a jumper wire. Then, when the connection member 18 is mounted not on the second connection land 16 but on the first connection land 15, the anode side of the light source 13 and the battery 19 can be electrically connected via the limiting resistor 14. Is set.

  The second connection land 16 includes a pair of lands that are pattern-printed in a shape in which a connection member 18 such as a jumper wire can be mounted, and the first connection land 15 is separated from the position of the first connection land 15. 15 and connected in parallel. When the connection member 18 is mounted not on the first connection land 15 but on the second connection land 16, the anode side of the light source 13 and the constant voltage circuit 17 can be electrically connected via the limiting resistor 14. Is set to

  The constant voltage circuit 17 includes, for example, a transistor, a bias resistor, and a Zener diode. When the connection member 18 is mounted on the second connection land 16 instead of the first connection land 15, the constant voltage circuit 17 is mounted on the vehicle. The power supply voltage (for example, 12V) input (supplied) from the battery 19 is output as a predetermined constant voltage (for example, 10V) lower than the power supply voltage.

  The connection member 18 is made of, for example, a jumper line. In this case, the connection member 18 can be mounted on either one of the first connection land 15 and the second connection land 16.

  When the connection member 18 is mounted on the first connection land 15, the battery 19 is connected to the light source 13 via the limiting resistor 14. At this time, when the input signal from the vehicle speed sensor indicating that the vehicle speed is equal to or higher than a predetermined value (for example, 120 km / h) is input to the control unit 11, the control unit 11 turns on the transistor 12. Output a control signal. In response to this control signal, the transistor 12 switches the transistor 12 to the on state, causes the light source 13 to emit light, and displays that should be notified to the user of the vehicle (in this case, the vehicle speed is 120 km / h or higher). Is displayed on the indicator 10.

  By the way, the feature of the present invention is that, for example, depending on the destination, only the design of the indicator 10 turns on the front fog lamp that requires low luminance from the overspeed indicator that indicates excessive travel speed that requires high luminance (the alarm information) (see above). Even if there is a change in the design specification such as a change to a front fog indicator indicating normal operation information that is less urgent than the alarm information), the connection member 18 is not the first connection land 15 but the fixed By simply mounting on the second connection land 16 on the voltage circuit 17 side, the light emission luminance of the indicator 10 can be easily changed from the high luminance specification to the low luminance specification using the circuit board 7 adopted in the present embodiment as it is. It is possible to do that. Accordingly, it is not necessary to separately design and deal with a dedicated circuit board for each design specification as in the past, and at the same time, it is not necessary to perform product evaluation work for the circuit board for each design specification ( That is, if the product evaluation work of the circuit board 7 is performed, a plurality of design specifications can be dealt with), so that the circuit board design work and the product evaluation work can be simplified and cost reduction can be achieved.

  As described above, in this embodiment, the display device for a vehicle that performs light emission control of the light source 13 provided on the circuit board 7 by switching the on / off state of the transistor 12 and performs display to be notified to the user of the vehicle. The circuit board 7 has a first connection land 15 that allows the battery 19 and the light source 13 to be connected, and the power supply voltage that is connected in parallel to the first connection land 15 and is supplied from the battery 19. Is connected to the light source 13 and a constant voltage circuit 17 that outputs the predetermined constant voltage as a predetermined constant voltage, and one of the first and second connection lands 15 and 16 is provided. A connection member 18 made of a jumper wire can be mounted on the connection land.

  Therefore, even when there is a change in design specifications such that only the design of the indicator 10 is changed, the connection member 18 made of a jumper wire is connected to one of the first and second connection lands 15 and 16. Since it is possible to easily change the light emission luminance of the indicator 10 simply by mounting it on the connection land, it becomes unnecessary to separately design and deal with a dedicated circuit board for each design specification as in the past. At the same time, it is not necessary to perform the product evaluation work for the circuit board for each design specification. Therefore, the design work for the circuit board and the product evaluation work are simplified, and an increase in cost can be suppressed.

  In the present embodiment, the case where the connection member 18 mounted on one of the first and second connection lands 15 and 16 is made of a jumper wire has been described. For example, the connection member 18 is not a jumper wire. A resistance element having a predetermined resistance value (for example, 0Ω) or a diode may be used.

  As a modification of the present invention, as shown in FIG. 4, the limiting resistor 14 employed in this embodiment is not connected in series to the anode side of the light source 13, and the first and second connection lands 15 and 16 are connected. If the connecting member 18 is mounted on either one of them, the limiting resistor 14 has a function for selecting the energization of the first and second connection lands 15 and 16 and adjusting the luminance of the light source 13 at the same time. As a result, the number of components can be reduced (that is, no jumper wires or the like are required), and the mounting space can be saved. Therefore, the design work of the circuit board is further simplified, and further cost reduction can be achieved.

It is a front view of the display apparatus for vehicles by this embodiment. It is AA sectional drawing of FIG. It is a block diagram which shows the control circuit of the indicator by the embodiment. It is a block diagram which shows the control circuit of the indicator by the modification of this invention.

Explanation of symbols

7 Circuit board 10 Indicator 11 Control means 12 Transistor (switch means)
DESCRIPTION OF SYMBOLS 13 Light source 14 Limit resistance 15 1st connection land 16 2nd connection land 17 Constant voltage circuit 18 Connection member 19 Battery (power supply)

Claims (1)

A vehicle display device that performs light emission control of a light source provided on a circuit board by switching an on / off state of a switch means, and performs a display to be notified to a user of the vehicle,
The circuit board is connected in parallel with the first connection land that enables connection of a power source and the light source, and the power source voltage supplied from the power source is output as a predetermined constant voltage. And a second connection land that allows connection between the constant voltage circuit and the light source,
A configuration in which a resistance element can be mounted on any one of the first and second connection lands ,
The display device for a vehicle, wherein the resistance element has a function of adjusting a current value supplied to the light source .

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