JP3714498B2 - Vehicle display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light guide unit and a vehicle display device, and more particularly to a light guide unit and a vehicle display device used in a vehicle combination meter.
[0002]
[Prior art]
FIG. 9 is an exploded perspective view of a conventional vehicle combination meter.
The vehicle combination meter 100 can be broadly divided into a casing 102 provided with a night illumination light source (bulb bulb) 101 for performing illumination at night, an instrument group 103 for displaying the running state of the vehicle, and the like. In order to shield the illumination light guide plate 104 for illuminating each dial of the instrument group 103 by the illumination light emitted from the illumination light source 101, and the user group other than the display part such as the instrument group 103. And a front glass unit 106 that protects the instrument group 103 and prevents dust and the like from entering the vehicle combination meter 100.
[0003]
The instrument group 103 includes a speedometer unit for displaying the speed of the vehicle, a tachometer unit for displaying the number of revolutions of the engine, a fuel gauge unit for displaying the remaining amount of fuel, and the temperature of the engine cooling water. A speed gauge unit, a tachometer unit, a fuel gauge unit, and a temperature gauge unit. The light guide plate for illumination 104, a pointer 123, which will be described later, and a cross coil movement. 120 and the dial 122 are integrated to form a movement assembly.
[0004]
Here, since the structure of the movement assembly is the same, the movement assembly 110 including the speedometer unit will be described as an example.
FIG. 10 is a partial cross-sectional view in the assembled state in the vicinity of the movement assembly 110 including the speedometer unit.
[0005]
A movement assembly 110 including a speedometer unit includes a cross coil type movement 120 having a cross coil for driving a pointer 123 attached to a rotating shaft 120A to which a current corresponding to the speed of the vehicle is passed, and a light source for night illumination. A dial light guide plate 121 for guiding the illumination light LL ′ emitted from the dial 101 to the dial plate, and a dial plate 122 formed integrally with the dial light guide plate 121 and printed or cut out in advance. It is prepared for.
[0006]
Next, the outline operation will be described.
The movement assembly 110 including the speedometer unit displays the speed of the vehicle based on an output signal of a vehicle speed sensor (not shown). The movement assembly including the tachometer unit displays the engine speed based on an output signal of a speed sensor (not shown). The movement assembly including the fuel gauge unit displays the remaining amount of fuel based on an output signal of a fuel sensor (not shown). The movement assembly including the temperature gauge unit displays the engine coolant temperature based on an output signal of a temperature sensor (not shown).
[0007]
In parallel with these, when the power source of the night illumination light source 101 is supplied, as shown in FIG. 10, the illumination light LL ′ emitted from the night illumination light source 101 is used for the dial constituting the movement assembly 110. The light is incident through the light guide plate 121 or is directly incident, and the character is brilliant through the character printed portion or the character cut out portion of the dial plate 122.
[0008]
Further, the illumination light LL ′ emitted from the night illumination light source 101 enters the pointer 123 via the dial light guide plate 121, is emitted from the pointer 123, and the pointer 123 itself shines.
More specifically, in the cross coil type movement 120 corresponding to the speedometer unit, a current corresponding to the speed of the vehicle is passed through the cross coil, and the pointer 123 attached to the rotary shaft 120A is driven to display the speed display. Will be done.
[0009]
In parallel with this, when the power source of the night illumination light source 101 is supplied, the illumination light LL ′ emitted from the night illumination light source 101 is transmitted through the dial light guide plate 121 or directly. Guided by the plate 122, the character display portion is in a bright state.
Furthermore, the illumination light LL ′ emitted from the light source 101 for night illumination enters the pointer 123 through the dial light guide plate 121, is emitted from the pointer 123, and the pointer 123 itself shines.
[0010]
When automating the mounting of the parts of the conventional vehicle combination meter, it is conceivable that each part is surface-mounted using an HPC (Hard print circuit) board as a wiring board. It is conceivable to use surface-mounted LEDs instead of bulb bulbs that have been generally used.
[0011]
[Problems to be solved by the invention]
By the way, the surface-mounted LED has a smaller amount of light than a bulb light bulb and has a narrow viewing angle (angle range for emitting light so that the light can be visually recognized).
For this reason, in order to uniformly illuminate the dial without causing uneven brightness over a wide range, a large number of surface-mounted LEDs are used, and the transmitted light quantity is applied to the portion of the dial that transmits the illumination light LL ′. There was a problem that light control printing or the like had to be performed for control.
[0012]
Therefore, an object of the present invention is to provide a light guide unit and a vehicle display device that can illuminate a uniform dial and hands with a simple configuration using a small number of surface-mounted LEDs.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 is provided with a dial, a pointer provided on the front side of the dial, the dial and the back side of the pointer, and guides illumination light to the dial and the pointer. A light guide unit having a plate-shaped light guide plate body for the light guide plate main body, the light guide plate main body including an incident portion into which the illumination light is incident from an external light source, and the incident portion A conical side-shaped radiation reflecting surface that radially reflects the illumination light incident from the light, an emission unit that emits the illumination light reflected by the radiation reflection surface to the dial in a diffused state, and rotation of the pointer A plane reflecting surface that is integrally formed with the radiation reflecting surface on the axis side, reflects the illumination light incident from the incident portion, and guides it toward the rotation axis of the pointer, and the plane reflecting surface. The reflected illumination light is reflected and emitted to the pointer. A reflecting emitting portion is configured with a.
[0014]
According to the first aspect of the present invention, when illumination light is incident on the incident portion of the light guide plate body from an external light source, the radiation reflecting surface radially reflects the illumination light incident from the incident portion, and then exits. The unit emits the illumination light reflected by the radiation reflection surface to the dial in a diffused state.
[0016]
In addition, the plane reflecting surface formed integrally with the radiation reflecting surface on the rotating shaft side of the pointer reflects the illumination light incident from the incident portion and guides it toward the rotating shaft side of the pointer, and the reflection emitting portion Reflects the illumination light reflected by the plane reflecting surface and emits it to the pointer .
[0017]
According to a second aspect of the invention, in the vehicle display device according to claim 1, wherein the radial reflecting faces and the flat reflective surface set to n sets: a reflection surface group of the (n 2 or more integer), the reflection And n number of the incident portions provided at positions corresponding to the surface group.
According to the invention described in claim 2 , in addition to the operation of the invention described in claim 1, n sets (n: an integer of 2 or more) of reflecting surfaces each including a radiation reflecting surface and a plane reflecting surface, and this Since n incident portions provided at positions corresponding to the n sets of reflecting surface groups are provided, illumination can be performed over a large area.
[0018]
According to a third aspect of the present invention, in the vehicular display device according to the first or second aspect , the incident portion includes a condensing unit that makes the illumination light substantially parallel to the illumination light.
According to invention of Claim 3 , in addition to the effect | action of invention of Claim 1 or 2, the condensing means of an incident part makes illumination light substantially parallel light.
[0021]
According to a fourth aspect of the present invention, in the vehicle display device according to any one of the first to third aspects, the light source is a surface-mounted LED.
According to invention of Claim 4 , in addition to the effect | action of the invention of any one of Claim 1 thru | or 3, surface mount LED which is a light source inject | emits the light for illumination.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a vehicle combination meter.
The vehicle combination meter 1 can be broadly divided into an HPC substrate 3 on which a surface-mounted LED 2 that is a light source for emitting illumination light L is mounted, and guides the illumination light L to a dial 8 and a pointer 5 described later. The light guide unit 4, a movement 7 having a pointer 5 attached to the rotary shaft 6, and a dial plate 8 on which characters and the like for performing various displays are printed.
[0023]
FIG. 2 is a plan view of the light guide unit, FIG. 3 is a cross-sectional view taken along line AA of the light guide unit in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB of the light guide unit in FIG.
The light guide unit 4 is provided with a light guide plate main body 10 with a part of a disc cut out, and a projection light projecting on one surface side of the light guide plate main body 10 and the illumination light L emitted from the corresponding surface mount LED 2. Are incident on the three incident portions 11, the spectroscopic portion 12 constituting the reflecting surface group provided corresponding to the three incident portions 11, and the illumination light L reflected by the spectroscopic portion 12 and incident thereon. Is reflected to the pointer 5 side, and an emitting part 14 is provided for emitting the illumination light L reflected by the spectroscopic part 12 and entering the dial 8 in a diffused state.
[0024]
As shown in the perspective view of FIG. 5, the spectroscopic unit 12 has a concave part 20 in which a conical concave part and a triangular pyramid concave part are integrally formed, and more specifically, the incident part 11. The conical side-shaped radiation reflecting surface 15 that reflects the illumination light L incident from the radial direction and the radiation reflecting surface 15 are formed integrally with the radiation reflecting surface 15, and the illumination light L incident from the incident portion 11 is directed toward the reflection emitting portion 13. And a planar planar reflecting surface 16 for reflecting.
[0025]
As shown in the sectional view of FIG. 6, the incident portion 11 has a substantially cylindrical shape, and its incident surface 11 </ b> A has a spherical shape, and the illumination light L incident from the surface mount LED 2 is substantially parallel. By using light, the reflection efficiency in the spectroscopic unit 12 is improved.
The emitting portion 14 is white-coated or hot stamped, or has a diffusion surface formed by molding, and emits the illumination light L toward the dial 8 in a diffused state.
[0026]
FIG. 7 shows a partially enlarged front view in the middle of assembly of the vehicle combination meter 1 in a state where the light guide unit 4 is attached to the dial 8.
The light guide unit 4 is provided on the back surface of the dial plate 8 so as to illuminate the tachometer display portion 8A formed on the dial plate 8.
[0027]
Next, the operation of the light guide unit 4 will be described.
The illumination light L emitted from the surface mount LED 2 enters the light guide plate main body 10 from the incident surface 11A of the incident portion 11 of the light guide unit 4.
At this time, since the incident surface 11A has a substantially spherical shape, the illumination light L emitted from the surface-mounted LED that operates as a point light source is condensed into substantially parallel light.
[0028]
A portion of the illumination light L that is substantially parallel light is reflected radially by the radiation reflecting surface 15 (see FIG. 2), propagates in the light guide plate body 10, and diffuses in the direction of the dial 8 by the emitting portion 14. It is injected in the state.
Further, another part of the illumination light L that has been made substantially parallel light is reflected by the planar reflecting portion 16 toward the reflecting and emitting portion 13 (see FIG. 2), and the reflecting and emitting portion 13 is reflected by the planar reflecting portion 16. Then, the incident illumination light L is emitted to the pointer 5 side.
[0029]
As a result, as shown in FIG. 8, the light emitting unit AR5 corresponding to the character display area and the pointer 5 emits light by the light guide unit 4.
As described above, according to the present embodiment, even when a surface-mounted LED is used as a light source for illumination, pointer illumination and dial illumination can be efficiently performed without unevenness, and dimming is performed on the dial. Without printing, high-quality illumination using a small number (three in the above description) of surface-effective LEDs can be realized at low cost.
[0030]
Further, by using the surface mount LED, the vehicle combination meter can be thinned, and the assembly can be automated.
In addition, it is possible to perform pointer illumination and dial illumination with high brightness and uniformity, so it can be applied to a combination meter for black-face type vehicles, and the user can reliably recognize the illumination state even during the daytime. can do.
[0031]
Further, it is possible to illuminate any color by using a surface-mounted LED as a full-color LED and individually performing on / off control and light amount control of the red LED, green LED, and blue LED constituting the full-color LED. In this case, in order to reduce color unevenness, it is possible to insert a diffusion filter or the like between the incident surface and the incident surface.
[0032]
【The invention's effect】
According to the first aspect of the present invention, when illumination light is incident on the incident portion of the light guide plate body from an external light source, the radiation reflecting surface radially reflects the illumination light incident from the incident portion, and then exits. The unit emits the illumination light reflected by the radiation reflecting surface to the dial plate in a diffused state, so that even if a light source such as a surface-mounted LED is used as a light source and the viewing cabinet is narrow, a wide area is used. Uniform illumination is possible.
[0033]
According to the first aspect of the present invention, the planar reflecting surface formed integrally with the radiation reflecting surface on the rotating shaft side of the pointer reflects the illumination light incident from the incident portion, thereby rotating the pointer on the rotating shaft side. The reflection light emitting part reflects the illumination light reflected by the plane reflection surface and emits it to the pointer, so that the illumination light reflected by the radiation reflection surface is assigned for dial illumination, By assigning the illumination light reflected by the plane reflecting surface for the pointer illumination, it is possible to simultaneously illuminate the character display area and the pointer on the dial without increasing the number of light sources.
[0034]
According to the invention described in claim 2 , in addition to the operation of the invention described in claim 1, n sets (n: an integer of 2 or more) of reflecting surfaces each including a radiation reflecting surface and a plane reflecting surface, and this Since n incident portions provided at positions corresponding to the n sets of reflecting surface groups are provided, illumination can be performed over a large area, and uniform illumination without unevenness can be achieved with higher brightness.
[0035]
According to the invention described in claim 3 , in addition to the operation of the invention described in claim 1 or 2, the condensing means of the incident part makes the illumination light substantially parallel light. The amount of light incident on the light source can be increased, the total reflection efficiency can be improved, and illumination with higher luminance can be performed.
[0037]
According to the invention described in claim 4 , in addition to the operation of the invention described in claim 3 , since the surface-mounted LED is used as the light source for emitting the illumination light, the assembly can be automated and the bulb light bulb can be used. Compared with the case where the above is used, the vehicle display device can be made thinner.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vehicle combination meter according to an embodiment.
FIG. 2 is a plan view of a light guide unit.
3 is a cross-sectional view taken along the line AA of the light guide unit of FIG. 2;
4 is a cross-sectional view taken along the line BB of the light guide unit in FIG. 2;
FIG. 5 is a perspective view of a spectroscopic unit.
FIG. 6 is an enlarged cross-sectional view of an incident part.
FIG. 7 is an explanatory diagram of a mounting state of the light guide unit.
FIG. 8 is an explanatory diagram of an illumination state.
FIG. 9 is an exploded perspective view of a conventional vehicle combination meter.
FIG. 10 is a diagram illustrating the configuration of a conventional movement assembly.
[Explanation of symbols]
1 Vehicle combination meter 2 Surface mount LED
3 HPC board 4 Light guide unit 5 Pointer 6 Rotating shaft 7 Movement 8 Dial 10 Light guide plate main body 11 Incident part 11A Incident surface 12 Spectroscopic part 13 Reflective emission part 14 Ejection part 15 Radiation reflective surface 16 Planar reflective surface 20 Recessed part 83 Light guide Reflective surface L Illumination light

Claims (4)

A dial plate, a pointer provided on the front side of the dial, and a plate-shaped light guide plate body provided on the back side of the dial and the pointer for guiding illumination light to the dial and the pointer A vehicle display device comprising a light guide unit having
The light guide plate main body has an incident portion where the illumination light is incident from an external light source;
A cone-shaped radiation reflecting surface that radially reflects the illumination light incident from the incident portion;
An emission unit that emits the illumination light reflected by the radiation reflecting surface to the dial in a diffused state;
A plane reflecting surface that is integrally formed with the radiation reflecting surface on the rotating shaft side of the pointer, reflects the illumination light incident from the incident portion, and guides the light toward the rotating shaft of the pointer;
A reflection emitting unit that reflects the illumination light reflected by the planar reflecting surface and emits the light to the pointer;
A vehicle display device comprising: The vehicle display device according to claim 1 ,
N sets (n: an integer of 2 or more) of reflecting surfaces each including the radiation reflecting surface and the planar reflecting surface;
N incident portions provided at positions corresponding to the reflecting surface group;
A vehicle display device comprising: The vehicle display device according to claim 1 or 2 ,
The vehicle display device according to claim 1, wherein the incident portion includes a condensing unit that makes the illumination light substantially parallel light. The vehicle display device according to any one of claims 1 to 3 ,
The vehicle display device, wherein the light source is a surface-mounted LED.

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