JP5539166B2 - Illumination structure of meter device - Google Patents

Description

  The present invention relates to a meter device mounted on a vehicle, an aircraft, a ship, and the like, and in particular, a meter device that can effectively suppress illumination unevenness caused by the rotation of the pointer even when the pointer rotates largely. It relates to a lighting structure.

  As a conventional lighting device using a light guide, for example, the one described in Patent Document 1 is known. That is, the illumination device is an illumination device for an instrument such as a vehicle, for example, and as shown in FIGS. 9 and 10, the pointer 102 that is the first illumination object that rotates around the rotation shaft 101, and the pointer 102 A dial 103, which is a display member that is located behind the pointer 102 (lower side in the figure) and is transmitted and illuminated, and a hard glass epoxy resin that is located behind the dial 103 (lower side in the figure). The circuit board 104, the light emitting diodes 105 and 106, which are provided on the circuit board 104 and illuminate the pointer 102 and the dial plate 103, respectively, and the illumination areas of the light emitting diodes 105 and 106, respectively. A cylindrical partition wall 107 which is a partition member for partitioning, a measuring instrument main body 108 for rotating the rotating shaft 101 fixed behind the circuit board 104, and the light from the light emitting diode 105 for indicating the pointer 1 2, a second light guide 111 that guides the light of the light emitting diode 106 to the dial plate 103, and a case 112 that supports the first and second light guides 110 and 111. The illumination device is provided with a connecting portion 113 that connects the first light guide 110 and the second light guide 111. The connecting portion 113 has a recess 114.

  According to this illuminating device, since the connecting portion 113 has an inverted U shape, light from the light emitting diodes 105 and 106 that are the first and second light sources having different illumination colors enters the connecting portion 113. Therefore, the light emitting diodes 105 and 106 are prevented from being mixed in the first and second light guides 110 and 111, and the deterioration of the illumination quality is suppressed. can get.

  However, in the illumination device having such a configuration, the LED as the light source is a point light source and has high directivity. Therefore, in order to prevent uneven illumination due to the rotation of the pointer, a circle around the pointer axis is used. It was necessary to install many light sources around the circumference.

  In order to avoid the need to install a large number of such light sources, for example, the one described in Patent Document 2 is also known. That is, in this display device, as shown in FIGS. 11 and 12, the optical axis D of the light source 201 is arranged so as to be offset upward by ΔL with respect to the axis C of the pointer unit 202. A part of the emitted light enters the light guide member 204 from the first light incident surface 203, passes through the cylindrical portion 204 </ b> A, and enters the pointer portion 202. Further, the light incident on the pointer portion 202 is reflected by the reflecting surface 205 of the pointer portion 202 toward the tip of the pointer 202A, while a part of the light emitted from the light source 201 is the second light incident surface. The light is incident on the light guide member 204 from 206, is refracted and reflected by the inner surface of the conical surface 207, and is directed toward the light reflecting surface 208 on the outer peripheral side. In the figure, reference numeral 202B denotes a pointer shaft, and 209 denotes a dial.

JP 2005-77185 A JP 2010-48743 A

  Since the latter display device described above can illuminate both the dial and the hands using a small number of light sources, there is no problem in that respect. However, depending on the position of the pointer that moves as the pointer rotates, the light incident surface at the pointer may be separated from the light source, and the amount of illumination light at the pointer may be significantly reduced.

  As a result, there is no problem if the rotation angle of the pointer, such as a fuel gauge or water temperature gauge, is narrow, but there is no problem, but the pointer rotates at a large rotation angle such as a speedometer or tachometer. In the moving type, depending on the pointer angle position, the light amount of the pointer illumination light may vary, and the quality of the illumination device may be degraded.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to display a pointer and a dial using a small number of light sources, even when the pointer rotates greatly. An object of the present invention is to provide an illumination structure for a meter device that can effectively suppress uneven illumination due to rotation.

In order to achieve the above-described object, an illumination structure of a meter device according to the present invention is characterized by the following (1) to (4).
(1) a translucent display board;
A pointer, a pointer shaft, a head that is connected to the pointer and the pointer shaft, and has a light receiving surface provided at a position different from the pointer shaft on a back surface to which the pointer shaft is connected; A pointer portion that pivots about
A light amount adjusting element formed of a translucent material, the surface of which is disposed to face the light receiving surface and is penetrated by the pointer shaft while avoiding the central portion;
A light source that emits illumination light to the central portion of the back surface of the light amount adjusting element;
Driving means for rotating the pointer shaft penetrating the light amount adjusting element and the display plate;
With
The light amount adjusting element is formed on a surface of the surface facing the light receiving surface in a region where the light receiving surface passes over the surface when the pointer portion passing through the light amount adjusting element rotates. As the distance from the part increases, an illumination light increasing and emitting part for increasing the emitted light quantity from the surface of the light quantity adjusting element is formed,
about.
(2) An illumination structure of the meter device having the configuration of (1) above,
The illumination light increasing and emitting portion has a substantially mountain-shaped cross section in which the height of the mountain is increased so that the inclination angle gradually increases from the central portion to the peripheral portion of the light amount adjusting element, or the depth of the valley is increased. It is composed of serrations provided with a large number of concave and convex portions having a substantially valley shape in cross section.
about.
(3) An illumination structure of the meter device having the configuration of (1) or (2) above,
The light amount adjusting element has a mortar shape in which the surface of the central portion is recessed in a concave shape.
about.
(4) The illumination structure of the meter device having any one of the constitutions (1) to (3),
The illumination light increasing and emitting portion is formed in a substantially fan shape centered on the central portion,
about.

According to the illumination structure of the meter device described in (1) above, it is possible to display the pointer and the dial using a small number of light sources, and the pointer rotates greatly when displaying with the pointer. Even in this case, the illumination unevenness accompanying the rotation of the pointer can be effectively suppressed, and the illumination structure of the high-quality meter device can be provided.
According to the illumination structure of the meter device described in the above (2), the illumination light increasing and emitting part can be constituted by a serration part having a serration structure having a relatively simple structure, and thus the cost can be reduced. Become.
According to the illumination structure of the meter device described in (3) above, it is possible to guide the light propagating through the illumination light increasing emission part to the surface of the illumination light increasing emission part. As a result, the limited amount of illumination light can be used effectively, and accordingly the illumination efficiency for the display board and the pointer can be increased.
According to the illumination structure of the meter device described in the above (4), the illumination light increasing and emitting part can be configured with a relatively simple shape having a substantially fan shape, so that the cost of the mold or the like can be reduced. As a result, the manufacturing cost can be reduced.

According to the illumination structure of the meter device of the present invention, the light quantity reduction increases as the light receiving surface of the pointer portion gradually moves in the direction deviated from the optical axis of the light source with the turning operation of the pointer portion. Contrary to this, the overlapping area of the light receiving surface to the illumination light increasing and emitting portion is increased.
Accordingly, both light quantity changes can be canceled out, so that even if the pointer rotates largely, a substantially uniform light quantity can be incident on the pointer. As a result, in the present invention, when displaying the pointer and the dial with a small number of light sources, even when the pointer is largely rotated, illumination unevenness due to the rotation of the pointer can be effectively suppressed. Become.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

It is a figure explaining the meter apparatus with which the illumination structure concerning embodiment of this invention was applied, Comprising: (A) is the top view, (B) is explanatory drawing to which the principal part was expanded. It is the II-II sectional view taken on the line in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the pointer part used for the meter apparatus to which the illumination structure concerning embodiment of this invention was applied, Comprising: (A) is the perspective view, (B) is a perspective view which shows the back surface side. . It is a principal part expansion perspective view of the pointer part used for the meter apparatus with which the illumination structure concerning embodiment of this invention was applied. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the head and prism of a pointer part used for the meter apparatus to which the illumination structure which concerns on embodiment of this invention was applied, Comprising: (A) is a description which shows the relative positional relationship of the head and prism of the pointer part. It is a figure, (B) is a VB-VB arrow directional cross-sectional view in FIG.1 (B). It is explanatory drawing which shows the effect | action of the meter apparatus to which the illumination structure which concerns on embodiment of this invention was applied. It is explanatory drawing which shows the optical path of the illumination light which advances the inside of the prism to which the illumination structure which concerns on embodiment of this invention was applied. It is explanatory drawing of the meter apparatus to which the illumination structure of the modification of this invention was applied. It is sectional drawing of the meter apparatus to which the conventional illumination structure was applied. It is a top view which shows the state which removed the indicator and dial of the meter apparatus to which the conventional illumination structure was applied. It is an external appearance front view of the meter apparatus to which other conventional illumination structures were applied. It is sectional drawing of the meter apparatus to which the other conventional illumination structure was applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG.1 and FIG.2 shows the meter apparatus 1 to which the illumination structure of this invention was applied.
The meter device 1 includes a light source 3 mounted on a substrate 2, a movement 4 attached to a predetermined location on the back side of the substrate 2 on which the light source 3 is mounted, a light source 3 and A display board 5 that constitutes a display board that displays necessary information about the design itself, such as numbers, letters, symbols, etc., or the environment around the car, installed in a biased state on the top of the movement 4, and pointers And a prism 7 constituting a light amount adjusting element. In addition, the code | symbol 8 in the same figure shows a part of casing which an inner surface comprises a reflecting plate.

  The meter device 1 of the present embodiment constitutes a part of a combination meter, and the periphery is covered with a facing plate. In addition, the display plate is opened with various display windows for installing various instruments including the meter device 1, and is integrated with a combination meter case constituting the side surface and the back surface side. Further, the facing plate is covered with a transparent cover glass such as black.

  Note that the meter device 1 of the present embodiment constitutes a speedometer, and based on a sensor signal corresponding to a speed detected by a sensor (not shown), the pointer 6B of the pointer section 6 is rotated by a predetermined angle to display. A specific number or scale formed on the plate 5 is indicated.

  The light source 3 is installed immediately below the optical axis A so that the optical axis A passes through the incident surface 7B provided at the center of the back surface opposite to the surface (upper surface in FIG. 2) of the prism 7 which is a light amount adjusting element (FIG. 5 ( B)), and the illumination light is emitted toward the incident surface 7B located at the center of the back surface of the prism 7. The light source 3 of the present embodiment is configured by, for example, an LED (Light Emitting Diode) that emits visible light having a predetermined wavelength (λ), and light emitted from the light source 3 (hereinafter referred to as illumination light). Has a distribution state in which the central portion where the optical axis A is provided is the maximum light quantity, but the phase angle does not depend on the direction and has uniform emission characteristics. That is, the light source 3 of the present embodiment has a light quantity distribution characteristic that emits a substantially uniform light quantity over the entire circumference in the horizontal plane (XY plane) direction. The light source 3 of the present embodiment is not particularly limited to this LED, but is preferably a small point light source with low power consumption.

  Although not shown in the figure, the movement 4 includes a motor that is a driving means for rotating the pointer shaft 6A of the pointer portion 6, a gear, an output shaft that is integrally connected to the pointer shaft 6A, and the like. .

  The motor is for rotating the pointer portion 6, and by rotating the output shaft via the gear, the pointer 6 </ b> B is rotated along the surface of the display plate 5, and various types of pointer 6 </ b> B are required. It points to information. In addition, the motor of this embodiment comprises the stepper motor.

  The display plate 5 has translucency and is provided with the speed display numbers and scales constituting the illumination light design on the outer surface side, and is emitted from the light source 3 and transmitted through the prism 7. Numbers and scales are emitted by the illumination light.

  The pointer portion 6 is connected to the pointer shaft 6A, the pointer 6B, the pointer shaft 6A and the pointer 6B, and the back surface to which the pointer shaft 6A is connected is provided with a light receiving surface 6D at a position different from the pointer shaft 6A. 6C. The pointer shaft 6A passes through the shaft hole 5A (see FIGS. 1A and 2) of the display plate 5 and the through hole 7A of the prism 7, and is integrally connected to the output shaft of the motor. The head 6C and the pointer 6B rotate about the speed corresponding to the speed detected by a sensor (not shown).

  Further, as the pointer portion 6 rotates so that the light receiving surface 6D moves away from a zero phase position α (see FIG. 6), which will be described later, as the pointer 6B rotates, illumination light to the light receiving surface 6D is also described later. Instead of reducing the amount of incident light from the illumination light general emitting portion 7D (see FIG. 7), the amount of illumination light that proceeds to the pointer 6B by increasing the incident light from the serration portion 7C, which is an illumination light increasing and emitting portion to be described later. It is configured to achieve uniformity.

  The prism 7 constituting the light amount adjusting element of this embodiment is formed of an appropriate material having translucency. As shown in FIG. 5B, the prism 7 has a surface (upper surface in FIG. 5B) facing an inner surface (lower surface in FIG. 5) opposite to the outer surface (upper surface in FIG. 2) of the display panel 5. In addition, it is installed by an appropriate means in the vicinity of the inner surface of the display plate 5 with the surface facing the light receiving surface 6D of the pointer portion 6. The prism 7 is installed in a state in which the relative position with respect to the light source 3 is adjusted so that the optical axis A passes through the center position of the incident surface 7B provided at the center of the back surface, and at the center of the incident surface 7B. Illumination light enters.

  Further, as shown in FIG. 5B, the prism 7 has a vertical (Z) through-hole 7A through which the pointer shaft 6A is rotatably inserted at a position avoiding the central portion where the incident surface 7B is located. Drilled through in the direction. Furthermore, a serration portion 7C constituting an illumination light increasing and emitting portion is provided in a specific area of the prism 7 having a predetermined shape, and the other surface portion constitutes the illumination light general emitting portion 7D.

  The serration portion 7C is formed on the surface opposite to the light receiving surface 6D of the head 6C in a region where the light receiving surface 6D passes over the surface when the pointer portion 6 penetrating the prism 7 rotates. The amount of light emitted from the surface of the prism 7 is increased as the distance from the portion increases. The serration unit 7C will be described in more detail with reference to FIG. First, the position where the serration portion 7C is formed on the surface of the prism 7 is as follows.

That is, the serration unit 7C rotates from the zero phase position α (see FIG. 6) at which the light receiving surface 6D rotating about the axis B is closest to the central part of the prism 7 to the maximum angle allowed by the pointer unit 6. Formed in a region on the surface of the prism 7 including the light receiving surface positions 6D _α , 6D _β , and 6D _γ through which the light receiving surface 6D passes through the maximum phase position β (see FIG. 6) where the light receiving surface 6D is positioned. Has been. When the light receiving surface 6D is at the zero phase position α, the pointer 6B is positioned on the line indicated by 6B _α in FIG. 6, and when the light receiving surface 6D is at the maximum phase position β, the pointer 6B is at 6B in FIG. Located on the line indicated by _β .

  The serration portion 7C is provided with a large number of irregularities on the surface of the prism 7 shown in FIG. 7 so that the inclination angle gradually increases toward the outer surface edge portion away from the surface central portion A of the prism 7 corresponding to the zero phase position α. I'm allowed. That is, the serration portion 7C is formed with a serration structure in which a large number of fine irregularities having a substantially mountain-shaped cross section or a substantially valley-shaped cross section are continuously provided so that a mountain gradually increases or a valley gradually deepens. ing.

  The serration portion 7 </ b> C has a substantially fan-shaped shape with a radius extending from the vicinity of the surface central portion A of the prism 7 to the outer edge portion of the prism 7.

  In addition, as shown in FIG. 5B, the prism 7 has a mortar-shaped inclined curved surface area in which the surface of the prism 7 immediately above the incident surface 7B is recessed, and the inclined curved surface area includes serrations. An inner internal reflection surface 71 that reflects illumination light toward the portion 7C is provided. Further, the prism 7 further increases the amount of illumination light emitted from the serration portion 7C by further internally reflecting the illumination light transmitted through the interior after being internally reflected by the inner internal reflection surface 71 on the outer peripheral portion of the surface of the prism 7. An outer internal reflection surface 72 is provided. Thereby, the light propagating through the serration unit 7C can be guided to the surface of the serration unit 7C.

The illumination light general emitting portion 7D is the surface of the prism 7 excluding the region where the serration portion 7C is formed. As shown in FIG. 7, the illumination light general emitting section 7D also transmits illumination light emitted from the surface of the prism 7 toward the display plate 5 and the light receiving surface 6D after passing through the prism 7. By the way, when the pointer 6B of the pointer portion 6 is positioned at 6B _α in FIG. 6, the light receiving surface position 6D _α of the light receiving surface 6D is closest to the optical axis A. For this reason, in this case, a sufficient amount of light can be expected even with illumination light incident on the light receiving surface 6D from the illumination light general emitting portion 7D. On the other hand, when the pointer 6B of the pointer section 6 is positioned away from 6B _γ and 6B _{β in} FIG. 6 and gradually from 6B _α , the light receiving surface positions 6D _β and 6D _γ of the light receiving surface 6D move away from the optical axis A. If there is no serration part 7C on the surface of the prism 7, the illumination light incident on the light receiving surface 6D from the illumination light general emitting part 7D decreases, and a sufficient amount of light cannot be expected with only the illumination light. Therefore, in the illumination structure of the meter device of the present invention, the diminishing amount of the illumination light incident on the light receiving surface 6D from the illumination light general emitting portion 7D is supplemented by the illumination light incident on the light receiving surface 6D from the serration portion 7C.

  Next, the operation of the present embodiment will be described mainly with reference to FIGS. In addition, although description of the meter apparatus 1 here demonstrates the effect | action, taking a speedometer as an example among each measuring instrument, it is not limited to this in particular. This operation is the same in the case of other analog type meter devices.

  A motor provided in the movement 4 of the meter device 1 is driven to rotate based on a sensor signal corresponding to a current speed detected by a speed sensor (not shown), and a pointer 6B connected thereto is rotated by a predetermined angle. Then, a specific number or scale that is a design formed on the display board 5 is indicated.

  That is, the motor-side output shaft and the pointer shaft 6A integral therewith start to rotate at a predetermined angular velocity, and the pointer 6B whose base end is fixed to the head 6C to which the pointer shaft 6A is attached is rotated by a predetermined angle. A specific number or scale on the display board 5 is indicated at the tip of the pointer. As a result, the current speed can be notified to the driver by analog display.

  In the meter device 1 that performs such speed display, at the same time, as shown in FIG. 5B, the center A of the incident surface 7B provided at the center of the lower surface of the prism 7 (the portion of the optical axis A is the maximum). Illumination light is emitted from the facing light source 3 toward the light quantity). In this case, since the light amount distribution has the optical axis A as the maximum light amount, the illumination light incident on the incident surface 7B passes through the prism 7 and then exits from the upper surface of the prism 7, generally at the center. The amount of emitted light from the light source increases, and the amount of emitted light decreases as it goes toward the periphery along the outer side in the radial direction.

  Incidentally, the light receiving surface 6D of the pointer portion 6 that receives the illumination light emitted from the prism 7 is provided on the front side of the lower surface of the head 6C of the pointer portion 6 near the pointer shaft 6B near the pointer shaft 6A. Is an arrangement configuration that rotates about the axis B. In addition, the axis B, which is the rotation center of the pointer shaft 6A, is displaced from the optical axis A of the light source 3 by a distance δ.

On the other hand, when the pointer 6B is positioned at the center of the upper surface of the prism 7, in other words, when the pointer 6B of the pointer portion 6 is positioned at 6B _α in FIG. 6, the light receiving surface 6D is positioned immediately above the light source 3. The illumination light can be made incident on the light receiving surface 6D with the maximum light amount.

Meanwhile, a specific angle to the right or left direction from the pointer. 6B 6B _alpha (6 clockwise direction) (e.g., omega _gamma rad) when rotated, the head 6C are hung on the rotation of the pointer shaft 6A also Rotate together by the same angle (ω _γ ). However, the axis B of the pointer shaft 6A of the pointer portion 6 is shifted from the optical axis A passing through the central portion of the prism 7 in the radial direction by a distance δ with respect to the optical axis A of the light source 3. For this reason, when the pointer 6B rotates by the angle (ω _γ rad), the light receiving surface 6D moves to the light receiving surface position 6D _γ at the intermediate position γ along the arc line S that is the locus. In other words, this is because it means that apart from the optical axis A that passes through the central portion of the prism 7 surface, the amount of light incident on the light receiving surface 6D on the light receiving surface position 6D _gamma is an amount corresponding away from the optical axis A It is attenuated from the amount of incident light on the optical axis A on the surface of the prism 7. Also, the minute amount of incident light on the light receiving surface position 6D _gamma decays, also decreases the light emission luminance in the guidelines 6B.

However, in the present embodiment, the prism 7 is provided with the serration portion 7C, and the light receiving surface position 6D _γ partially enters the region of the serration portion 7C (almost half in FIG. 6) and overlaps therewith. ing. Accordingly, in the overlapping area with the serration unit 7C, the light amount is increased by the light amount increasing function of the serration unit 7C. Thus, it is possible to offset the reduction in light quantity due to deviate from the optical axis A of the light receiving surface 6D located on the light-receiving surface position 6D _gamma is located in central prism 7.

Similarly, when the pointer 6B is rotated to an allowable maximum angle (for example, ω _β rad), the head 6C is also integrally rotated by the same angle (ω _β ) as the pointer 6B is rotated. As a result, the light receiving surface position 6D _β in the azimuth at the maximum phase position β is further away from the optical axis A at the center of the prism 7. Therefore, the amount of incident light on the light receiving surface 6D at the light receiving surface position 6D _β Will be further attenuated.

However, as described above, in the embodiment, a serration portion 7C is provided, the light-receiving surface position 6D _beta penetrates the entire area of the light receiving surface 6D in the region of the serration portion 7C, the light-receiving surface position 6D _beta is serration portion 7C (See also FIG. 7). Thus, since the light receiving surface 6D entirely overlaps the serration unit 7C, the light amount from the serration unit 7C is further increased by the light amount increasing function of the serration unit 7C. Thus, it is not able to successfully counteract the reduction in light quantity due to the light-receiving surface position 6D _beta deviates greatly from the center position of the prism 7.

  The relationship between the light receiving surface 6D that moves along the arc line S in conjunction with the rotational position of the pointer 6B and the amount of illumination light received is as shown in Table 1 below.

  Therefore, according to the present embodiment, even if the pointer 6B rotates to the maximum phase position β that is farthest from the zero phase position α, the light receiving surface 6D has substantially the same amount of illumination light as the zero phase position α. The amount of light can be secured. That is, it is possible to illuminate and emit light up to the tip of the pointer 6B in almost the same state regardless of the rotation position of the pointer 6B.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention. For example, in the present embodiment, the light receiving surface 6D of the pointer portion 6 that receives the illumination light emitted from the prism 7 is provided on the front side that is closer to the pointer 6B when viewed from the pointer shaft 6A. Is not to be done. As illustrated in FIG. 8, the light receiving surface 6 </ b> D of the pointer portion 6 may be provided on the rear side opposite to the pointer 6 </ b> B when viewed from the pointer shaft 6. Even in such a case, it is not necessary to add any new changes to the shape and arrangement of the illumination light increasing and emitting section (the serration section 7C constituting this) provided in the prism 7.

  Further, as a meter device to which the illumination structure of the present invention is applied, for example, in addition to the speedometer unit of the present embodiment, it can be applied to various instruments such as a tachometer unit, a fuel meter unit, and a water temperature meter. In particular, even a large meter, that is, a type in which the pointer is rotated over a large angle range can be used to make the luminance uniform with the pointer, which is convenient.

DESCRIPTION OF SYMBOLS 1 Meter apparatus 2 Board | substrate 3 Light source 4 Movement 5 Display board 5A Shaft hole 6 Pointer part 6A Pointer axis 6B Pointer 6C Head 6D Light-receiving surface 6D _alpha , 6D _beta , 6D _gamma- light-receiving surface position 7 Prism 7A Through-hole 7B Incidence surface 7C Serration part 7D Illumination light general emission part 71 Inner internal reflection surface 72 Outer internal reflection surface 8 Casing A Optical axis B Axis line S Arc line α Zero phase position β Maximum phase position γ Intermediate position

Claims (4)

A translucent display board;
A pointer, a pointer shaft, a head that is connected to the pointer and the pointer shaft, and has a light receiving surface provided at a position different from the pointer shaft on a back surface to which the pointer shaft is connected; A pointer portion that pivots about
A light amount adjusting element formed of a translucent material, the surface of which is disposed to face the light receiving surface and is penetrated by the pointer shaft while avoiding the central portion;
A light source that emits illumination light to the central portion of the back surface of the light amount adjusting element;
Driving means for rotating the pointer shaft penetrating the light amount adjusting element and the display plate;
With
The light amount adjusting element is formed on a surface of the surface facing the light receiving surface in a region where the light receiving surface passes over the surface when the pointer portion passing through the light amount adjusting element rotates. As the distance from the part increases, an illumination light increasing and emitting part for increasing the emitted light quantity from the surface of the light quantity adjusting element is formed,
The illumination structure of the meter apparatus characterized by the above-mentioned. The illumination light increasing and emitting portion has a substantially mountain-shaped cross section in which the height of the mountain is increased so that the inclination angle gradually increases from the central portion to the peripheral portion of the light amount adjusting element, or the depth of the valley is increased. It is composed of serrations provided with a large number of concave and convex portions having a substantially valley shape in cross section.
The illumination structure for a meter device according to claim 1. The light amount adjusting element has a mortar shape in which the surface of the central portion is recessed in a concave shape.
The illumination structure of the meter device according to claim 1, wherein the illumination structure is a meter device. The illumination light increasing and emitting portion is formed in a substantially fan shape centered on the central portion,
The illumination structure of the meter device according to any one of claims 1 to 3, wherein

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