JP2004061861A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for vehicle without need of a wiring member for electrically connecting a microswitch to detect the position of a reflection mirror to a circuit board. <P>SOLUTION: A display unit 21 emits display light L. A reflection member 23 reflects the display light L. A motor 26 moves the member 23 in terms of angle through a driving mechanism 27. The microswitch 32 detects a given angle position of the member 23. An actuation piece 31 for pressing the microswitch 32 is provided in the mechanism 27. The motor 26 and the microswitch 32 are provided on one circuit board 33. The mechanism 27 has a cam 30, and the actuation piece 31 is provided integrally with the cam 30. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device for a vehicle, and more particularly to a display device for a vehicle that adjusts an angular position of a reflection member that reflects display light emitted from a display device so as to match a viewpoint position.
[0002]
[Prior art]
Conventionally, there is a head-up display device that displays a virtual image V by projecting display light L from a display unit 2 onto a windshield 1 of a vehicle (see FIG. 4). The display unit 2 includes a display 6 such as a fluorescent display tube, a reflecting mirror 4 for reflecting the display light L emitted by the display 3, a motor 5 for rotating the reflecting mirror 4, and the like in a housing 6. (See FIG. 5). A gear 7 is attached to a rotating shaft of the motor 5, and the gear 7 is meshed with a gear 9 fixed to a holding member 8 that holds the reflecting mirror 4.
[0003]
By operating a push button switch (not shown), the driver sets the angular position of the reflecting mirror 4 within a movable range (for example, 6 °) between the upper limit position and the lower limit position, and projects the display light L onto the windshield 1. Direction can be adjusted. For example, if the angle position of the reflecting mirror 4 is set near the lower limit position, it is possible to match the driver D1 with a higher viewpoint position, and if the angle position of the reflecting mirror 4 is set near the upper limit position, the viewpoint position is changed. It can be adjusted to the low driver D2. In order to avoid complicating the drawing, FIG. 6 shows an enlarged angle range between the upper limit position and the lower limit position.
[0004]
Microswitches 10 and 11 are provided at the upper limit position and the lower limit position of the movable range of the reflecting mirror 4, and when the holding member 8 contacts the microswitches 10 and 11, the driving of the motor 5 stops. The microswitches 10 and 11 are arranged near both ends of the holding member 8 and are electrically connected to a circuit board 12 on which the motor 5 is mounted by a wiring member 12 such as a wiring code. Such micro switches 10 and 11 are sometimes referred to as limit switches.
[0005]
[Problems to be solved by the invention]
However, a fixing member (not shown) for fixing the microswitches 10 and 11 and a wiring member 12 are required, which not only increases the number of components but also increases the number of assembling steps, so that the display unit 2 is expensive. There was a problem of becoming.
The present invention has been made in view of the above problem, and an object of the present invention is to provide a display device for a vehicle that does not require a wiring member for electrically connecting a micro switch for detecting a position of a reflector and a circuit board.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a display 21 that emits display light L, a reflecting member 23 that reflects the display light L, and a motor 26 that moves the reflecting member 23 through a driving mechanism 27 at an angle. A micro switch 32 for detecting a predetermined angular position of the reflection member 23, wherein the drive mechanism 27 is provided with an operating piece 31 for pressing the micro switch 32.
[0007]
In the present invention, the motor 26 and the microswitch 32 are provided on a single circuit board 33.
[0008]
In the present invention, the driving mechanism 27 has a cam 30, and the operating piece 31 is provided integrally with the cam 30.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a head-up display device will be described with reference to the accompanying drawings.
Reference numeral 20 denotes a display unit, which is arranged on a dashboard of the vehicle. The display light L projected by the display unit 20 is reflected by the windshield in the direction of the driver. The driver of the vehicle can visually recognize the virtual image superimposed on the scenery.
[0010]
Reference numeral 21 denotes a liquid crystal display (display). The liquid crystal display 21 comprises a TFT type liquid crystal display element and backlight means. Reference numeral 22 denotes a circuit board on which the liquid crystal display 21 is mounted. Reference numeral 23 denotes a reflection mirror (reflection member). The reflection mirror 23 reflects the display light L emitted from the liquid crystal display 21 to a windshield. The reflecting mirror 23 is formed by depositing a metal such as aluminum on a resin such as polycarbonate to form a reflecting surface 23a. The reflecting surface 23a of the reflecting member 23 is concave, and the display light L from the liquid crystal display 21 can be enlarged and projected on the windshield.
[0011]
Reference numeral 24 denotes a holding member, and the reflecting mirror 23 is fixed to the holding member 24 with a double-sided adhesive tape. A shaft portion 24a is integrally formed with the holding member 24, and the shaft portion 24a is supported by a bearing portion provided in a housing described later. The reflecting mirror 23 and the holding member 24 are supported so as to be swingable, and move angularly about the shaft portion 24a. The holding member 24 has a protruding portion 24b. Reference numeral 25 denotes a stopper, which restricts the movable range of the reflecting mirror 23 by bringing the protrusion 24b into contact with the stopper 25.
[0012]
Reference numeral 26 denotes a stepping motor (motor). The stepping motor 26 swings the reflecting mirror 23 and the holding member 24 via a driving mechanism described later. A driving mechanism 27 has a gear 28, a gear 29 and a cam 30. The driving mechanism 27 adjusts the angular position of the reflecting mirror 23 in an angle range between the upper limit position and the lower limit position. The gear 28 is fixed to a rotating shaft of the stepping motor 26, and the gear 29 is meshed with the gear 28. The cam 30 is fixed to the gear 29 and rotates around the axis of the gear 29. The holding member 24 is pressed against the cam 30 by a coil spring (not shown), and the rotation of the cam 30 causes the reflecting mirror 23 to move angularly together with the holding member 24.
[0013]
A striker (operating piece) 31 is formed integrally with the cam 30. Reference numeral 32 denotes a micro switch, and the micro switch 32 has a lever 32a. The micro switch 32 is turned on by the striker 31 when the reflection member 23 is at the origin position. That is, the microswitch 32 detects whether or not the reflecting mirror 33 is at the origin position. Reference numeral 33 denotes a circuit board on which the stepping motor 26 and the microswitch 32 are mounted.
[0014]
Reference numeral 34 denotes a housing, in which the liquid crystal display 21, the circuit board 22, the reflecting mirror 23, the driving mechanism 27 and the like are accommodated. Reference numeral 34a denotes a light-shielding wall. The light-shielding wall 34a is formed integrally with the housing 34 to prevent a phenomenon (washout) in which external light such as sunlight enters the liquid crystal display 21 and a virtual image becomes difficult to see. I have. The housing 34 is provided with a translucent cover 34b through which the display light L passes. The light-transmitting cover 34b is made of a light-transmitting resin such as acryl, and has a curved shape.
[0015]
FIG. 2 is a block diagram showing an electrical configuration of the head-up display device. A speed sensor 35 detects the speed of the vehicle, and outputs a speed signal to the microcomputer 36. 37 and 38 are pushbutton switches. When the push button switches 37 and 38 are turned on, a switch operation signal is output to the microcomputer 36, and the microcomputer 36 outputs a drive signal to the stepping motor 26 via a driver circuit (not shown), and the rotation of the stepping motor 26 The shaft 28 is rotated. When the push button switch 37 is turned on, the reflecting mirror 23 moves downward in angle, and when the push button switch 38 is turned on, the reflecting mirror 23 moves upward in angle.
[0016]
Reference numeral 39 denotes a memory switch. When the memory switch 39 is turned on, a switch operation signal is output to the microcomputer 36. When the memory switch 39 is continuously turned on for 0.5 second or more, the microcomputer 36 stores the angular position data of the reflecting mirror 23 at that time in an EEPROM described later. That is, if the memory switch 39 is kept pressed for 0.5 seconds or more, the angular position of the reflecting mirror 13 at that time is stored. When the memory switch 29 is turned on and turned off in less than 0.5 seconds, the microcomputer 26 outputs a drive signal to the stepping motor 18 based on the stored angular position data. That is, when the memory switch 39 is turned on for less than 0.5 seconds, the reflecting mirror 23 is angularly moved to the already stored angular position.
[0017]
An ignition switch 40 outputs to the microcomputer 36 an ignition status signal indicating whether the ignition is in the OFF, ACC, or ON position. The microcomputer 36 has a CPU 42, a ROM 43, and a RAM 44, performs predetermined arithmetic processing based on the speed signal, displays the speed on the liquid crystal display 21, drives the stepping motor 26, and controls the angle of the reflecting mirror 23. Make adjustments. Reference numeral 46 denotes an EEPROM. The EEPROM 46 stores angular position data stored by operating the memory switch 39.
[0018]
According to the present embodiment, since the drive mechanism 27 is provided with the striker 31 that presses the lever 32a of the microswitch 32, the place where the microswitch 32 is arranged is not limited to both ends of the holding member 24. The switch 32 can be arranged on the circuit board 33. Therefore, a wiring member for electrically connecting the micro switch 32 and the circuit board 33 is not required, and there is no possibility that the assembly of the display unit 20 becomes complicated.
[0019]
In this embodiment, the striker 31 is formed integrally with the cam 30. However, the striker 31 may be formed integrally with the gears 28 and 29, for example. Further, the stepping motor 26 and the microswitch 32 may be mounted on separate circuit boards, but if the stepping motor 26 and the microswitch 32 are mounted on one circuit board 33 as in the present embodiment, Further, the number of parts can be reduced.
[0020]
Further, the display of the present embodiment is the liquid crystal display 11, but may be, for example, a fluorescent display tube or an organic EL display panel. Although the motor of the present embodiment is the stepping motor 17, for example, a servo motor may be used. Although the present embodiment is a head-up display device, it goes without saying that the present invention can be applied to, for example, a virtual image display type vehicle combination meter.
[0021]
【The invention's effect】
The present invention provides a display device that emits display light, a reflection member that reflects the display light, a motor that moves the reflection member through a driving mechanism, and a microswitch that detects a predetermined angular position of the reflection member. Wherein the driving mechanism is provided with an actuating piece for pressing the microswitch, and the microswitch for detecting the position of the reflecting mirror and a wiring member for electrically connecting the circuit board are provided. It is not necessary and the number of parts can be reduced.
[0022]
In the present invention, the motor and the microswitch are provided on one circuit board, and the number of components can be further reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view of a display unit showing an embodiment of the present invention.
FIG. 2 is a block diagram of a head-up display device showing the embodiment.
FIG. 3 is an explanatory diagram of a movable range of the reflecting mirror according to the embodiment.
FIG. 4 is a schematic configuration diagram of a head-up display showing a conventional example.
FIG. 5 is a sectional view of a display unit showing the conventional example.
FIG. 6 is an explanatory diagram of a movable range of a reflecting mirror showing the conventional example.
[Explanation of symbols]
21 Liquid crystal display (display)
23 Reflector (reflective member)
26 Stepping motor 27 Drive mechanism 31 Striker (operating piece)
32 Micro switch L Display light

Claims (3)

A vehicle comprising: a display that emits display light; a reflective member that reflects the display light; a motor that angularly moves the reflective member via a driving mechanism; and a microswitch that detects a predetermined angular position of the reflective member. A display device for a vehicle, wherein an actuating piece for pressing the micro switch is provided in the drive mechanism. The vehicle display device according to claim 1, wherein the motor and the microswitch are provided on one circuit board. The display device for a vehicle according to claim 1, wherein the drive mechanism has a cam, and the operating piece is provided integrally with the cam.

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