JP2535609Y2 - Display device for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. 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 in which a dial is irradiated with a laser to visually recognize an interference image as a pseudo pointer.

[0002]

2. Description of the Related Art Conventionally, a display device using a laser beam as a pseudo pointer has been devised because it does not require a movement with a large driving torque and has a new design. 193012
A technique as described in Japanese Patent Application Laid-Open Publication No. HEI 10-203,086 is known. In this conventional display device, as shown in a schematic sectional view of FIG. 3, a first reflecting mirror 3 and a second reflecting mirror 4 are connected to an axis of a rotating shaft 2 of a movement 1 attached to an instrument case (not shown). The two reflecting mirrors 3 and 4 are arranged opposite each other so that they coincide with each other in the center, and the
And a bracket 6 extending from the rotation axis 2 of the movement 1
It is fixed to.

Further, the dial 7 is formed of a resin, and a light diffusing substance is sealed therein, so that when the laser beam is irradiated, the laser beam is diffused. A laser beam 8 is applied to the center of the dial
A hole 7a for allowing the light to enter the inside is provided. In addition,
A shield plate 9 and a cap 10 are provided so that the inside of the instrument and the inside of the hole 7a cannot be seen through.

[0004] The pseudo pointer P of the laser beam is formed by the following method in the above display device. That is,
The laser beam 8 traveling straight on the back surface of the dial 7 parallel to the dial 7 is reflected by the first reflecting mirror 3 and travels along the rotation axis 2 to the second reflecting mirror 4. The second reflecting mirror 4 is the first reflecting mirror 3
Is reflected from the side end surface of the hole 7a of the dial 7 into the dial 7. When the laser beam 8 is incident on the dial 7, the laser beam is diffused by a diffusing substance mixed in the dial 7, and the
A pseudo pointer P that shines linearly outward in the radial direction from a will be formed. It should be noted that the scale and the like are provided on the surface of the dial 7.

[0005] In this way, the pseudo hands P formed in the dial 7 accurately indicate a character scale or the like corresponding to the measured amount.

[0006]

However, in the above display device, the laser beam is diffused by the light scatterer sealed in the dial and formed as a pseudo pointer.
There is a point that the pseudo pointer is difficult to clearly see, and special care is required to uniformly enclose a light scattering body such as a diffusing substance in a transparent resin material dial.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device for a vehicle in which a pointer which can be clearly recognized by laser interference is formed on a dial surface.

[0008]

A display device for a vehicle according to the present invention includes a movement having a rotation shaft that rotates a predetermined angle in accordance with an amount to be measured, and a peripheral portion through which the rotation shaft of the movement is inserted. A dial on which characters, scales, etc. are displayed, and a light source attached to the tip of the rotating shaft and irradiating a laser in the peripheral direction of the dial, and disposed on the front surface of the light source,
An optical means for expanding the laser in a direction perpendicular to the dial and restricting the spread in a direction parallel to the dial, and a laser arranged at a peripheral portion of the dial and reflecting the laser emitted from the light source to the dial surface; A light-transmissive first reflecting member,
A second reflector disposed behind the first reflecting member for reflecting the laser transmitted through the first reflecting member and irradiating the vicinity of the dial surface irradiated with the laser reflected by the first reflecting member; And a reflection member.

[0009]

According to the above arrangement, when the light source is turned on and an input signal corresponding to the measured amount is input to the movement, the rotation axis of the movement rotates to a position corresponding to the input signal. The laser beam emitted from the light source attached to the tip of the rotating shaft is controlled by optical means to restrict the spread of the dial in the horizontal direction, and is radiated toward the peripheral portion of the dial as a vertically opened laser. Is done. The irradiated laser is reflected by the first reflecting member and irradiates the dial surface to cause interference, thereby forming a pointer for indicating a character, a scale, etc. corresponding to an input signal. Also, the laser transmitted through the first reflecting member is reflected by the second reflecting member and returns,
A similar pointer-like interference image is formed substantially parallel to the vicinity of the pointer-like interference image on the dial by the first reflection member.

[0010]

An embodiment will be described with reference to the drawings. The same parts as those in FIG. 3 described in the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 1A and 1B show an embodiment of a vehicle display device according to the present invention. As shown in the figure, the display device for a vehicle has a substantially semi-circular white dial 7.
In the periphery of the surface, characters, scales, etc. are displayed, and a hole 7a is formed in the center.
The rotating shaft 2 of the movement 1 is fitted into the hole 7a, and the rotating shaft 2 is rotated by a predetermined angle in accordance with an input signal input to the movement 1 in accordance with the measured amount. It is configured. A pointer forming portion 11 is attached to the tip of the rotating shaft 2. The pointer forming portion 11 has a laser diode 12 serving as a light source and an optical means for controlling a laser beam of the diode 12. The cylindrical lens 13 is housed.

As shown in FIG. 2, when a parallel light beam enters the cylindrical lens 13, the parallel light beam does not converge or diffuse in the X-axis direction, but converges in the Y-axis direction and focuses in the Z-axis direction. It is formed as a straight line parallel to the X axis at the position of the distance F. Therefore, as shown in FIG. 1A, when the laser diode 12 disposed behind the cylindrical lens 13 is turned on, the laser beam 8 transmits through the cylindrical lens 13 and moves in a direction horizontal to the surface of the dial 7. It has a constant width w, and once converges in the direction perpendicular to the face of the dial 7, then spreads and advances toward the periphery.

In the vicinity of the position on the periphery of the dial 7 where characters, scales and the like are displayed, the rotating shaft 2 of the movement 1 is provided.
An arc-shaped reflecting mirror having a substantially radius R with respect to the center C is provided upright as the first reflecting member 14. The first reflecting mirror 14 is formed by semi-evaporating the surface of transparent glass or transparent plastic, and is semi-transmissive so as to transmit a part of the irradiated light and reflect the other.

Behind the first reflecting mirror 14, a second reflecting member 15 is disposed in close contact with the entire back surface of the first reflecting mirror 14. The second reflecting member 15 is formed by joining two mirrors so that the cross section becomes a mountain shape, and is attached in a saw-tooth shape with its apex angle (substantially right angle) outward.
The reflecting members 14 and 15 are placed on the dial 7.
, A transparent protective plate 16 is provided.

In this state, when the laser diode 12 is turned on, the laser beam 8 is emitted toward the reflecting members 14 and 15, a part of which is reflected by the first reflecting member 14, and the rest is transmitted. Second reflection member 1 provided on the back
5 is incident. The laser 8a directed downward from the laser 8 reflected by the first reflecting member 14 irradiates the surface of the dial 7 linearly, causing interference, and is visually recognized as if it were a pointer. Further, a part 8b of the laser 8 transmitted through the first reflecting member 14 and incident on the second reflecting member 15 is:
The light is reflected by the first surface constituting the reflecting member 15 and further reflected by the second surface.
The surface of the dial 7 is illuminated after being transmitted again through the first reflecting member 14 after being reflected by the surface of the dial 7 and returning to the incident direction when viewed from above. For this reason, the pseudo pointer by the second reflection member 15 is formed and visually recognized so as to be parallel to the vicinity of the pseudo pointer formed by the reflection by the first reflection member 14.

When an input signal is input to the movement 1, the rotary shaft 2 rotates in response to the input signal, and accordingly, these pseudo hands also rotate to predetermined positions to indicate a character / scale. I do. In this case, depending on the rotation position of the rotation shaft 2,
Since the surface of the second reflecting member 15 on which the laser 8 is incident changes, the direction of the reflected laser 8b is formed by the first reflecting member 14 as the rotating shaft 2 rotates. It appears alternately and substantially in parallel on both sides of the pseudo pointer.

As described above, the vehicle display device of the present embodiment does not need to use a special procedure such as mixing a special material such as a light diffusing substance, a fluorescent substance or a phosphorescent substance into the dial 7. Therefore, the manufacture of the vehicle display device becomes extremely easy. In the above-described embodiment, a case where a laser diode is used as a laser light source attached to the rotation shaft 2 of the movement 1 has been described. However, other light sources, for example, outputs of a laser oscillator such as a solid-state laser and a gas laser, Alternatively, the same holds true when a laser beam emitted from a laser oscillator is guided by an optical fiber as a light source. In the above-described embodiment, the second reflecting member 15 is formed by joining two mirrors into a mountain shape. However, the present invention is not limited to this. A large number of planes may be arranged.

[Effect of the invention] As described above, according to the invention,
Even if the light diffusing substance is not sealed in the dial, the pseudo pointer by the laser can be clearly recognized. In addition, when the movement is driven, the pseudo pointer by the second reflecting member changes, so that the visibility is further increased.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams schematically illustrating a configuration of a display device according to an embodiment of the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along the line AA.

FIG. 2 is a diagram illustrating the formation of a band-like beam by a cylindrical lens used in the display device according to the embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view illustrating a configuration of a conventional display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movement 2 Rotating axis 7 Dial 8 Laser (laser beam) 11 Pointer forming part 12 Laser diode 13 Cylindrical lens 14 First reflecting member 15 Second reflecting member

Claims (3)

(57) [Scope of request for utility model registration] A movement provided with a rotation axis that rotates by a predetermined angle according to a measured amount; a dial having a rotation axis of the movement inserted therein and displaying characters, scales, and the like on a peripheral edge thereof; A light source attached to the tip of the rotating shaft and irradiating the laser in the direction of the peripheral edge of the dial, and disposed in front of the light source to spread the laser in a direction perpendicular to the dial and parallel to the dial; An optical means for restricting the spread of the direction, a first semi-transmissive reflecting member which is arranged on a peripheral portion of the dial and reflects the laser emitted from the light source to the dial surface; A second reflecting member that is disposed behind the reflecting member, reflects the laser transmitted through the first reflecting member, and irradiates the vicinity of the dial surface irradiated with the laser reflected by the first reflecting member. And a display device for a vehicle. 2. The method according to claim 1, wherein the first reflecting member is arranged in an arc shape at a position on a concentric circle centering on a rotation axis of the movement, and a reflecting surface thereof is arranged substantially perpendicular to the dial. The two reflecting members form a vertical angle of a predetermined angle.
A prism whose surface has been subjected to reflection processing or two mirrors having a predetermined opening angle and having a mountain-shaped cross section are disposed around the entire back surface of the first reflection member with their apexes facing outward. The vehicle display device according to claim 1. 3. The vehicle display device according to claim 1, wherein the vertex angle of the prism or the opening angle formed by the two mirrors is substantially a right angle, and the optical means is a cylindrical lens. .