JP2000283798A - Pointer illuminator for instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small and thin pointer illuminator having small number of parts and simple structure in which light from a single light source can be guided efficiently and transmitted to a pointer light receiving part even when a pointer has a structure turning over 180 deg.. SOLUTION: A pointer illuminating light conductor 20 having one end provided with a light illuminating part 21 facing a pointer light receiving part 16a disposed in the vicinity of the journal part of a pointer 15 on the dial 12 and the other end provided with a light introducing part 23 facing a light source 22 is provided on the rear side of the dial 12. A first reflective part 31 for reflecting a part of light from the light source to semi-circumferential part close to the light source, and a second reflective part 32 for reflecting a part of remaining light from the light source to semi-circumferential part on the side opposite to the light source are provided on the rear side of the light irradiating part of the pointer illuminating light conductor 20. These first and second reflective parts comprise substantially parallel inclining faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speedometer, a tachometer for informing a driver of, for example, a running speed of an automobile, an engine speed, a remaining amount of fuel in a tank, a temperature of engine cooling water, and the like.
The present invention relates to a pointer illuminating device for a meter used as a transmission illumination type meter in a meter such as a combination meter provided with an in-vehicle analog meter such as a fuel gauge and a thermometer.

[0002]

2. Description of the Related Art For example, a combination meter, which is provided on a dashboard located in front of a driver's seat for a vehicle and transmits various information to a driver while the vehicle is running, can travel at a high speed during the daytime as well as at nighttime. Even when driving on snowy roads, despite the sunlight,
It is necessary to have visibility so that the display of each meter can be read accurately.

In this recent main combination meter, a dark smoke filter is used on the surface panel of the meter, its transmittance is reduced, and the display background is made to be a so-called black face. ), The parts other than the scales and the like are made less noticeable, and the above-mentioned pointers, the characters on the dial, the scales, etc. are displayed in white and sharp with respect to the display background by the transmission illumination from the back side, so-called backlight. In addition, measures have been taken such as providing sufficient contrast and brightness both day and night to ensure the readability.

As a pointer illuminating device for illuminating and displaying a pointer in the above-mentioned transmission illumination type meter, a pointer is provided with a pointer light guide made of a light-guiding material. There is a structure in which a pointer light guide for guiding light emitted from a light source is provided on the back side of the dial.

FIGS. 10 (a) and 10 (b) show an example of a conventional pointer illuminating device. This device is a pair of plate-like members extending left and right symmetrically with respect to a pointer axis of a pointer (not shown). Light guides 1a and 1b are provided. These light guides 1a, 1b
Are provided with two light introducing portions 3a and 3b for introducing light emitted from the light sources 2a and 2b. Each light source 2 is provided at the inner end of the light guides 1a and 1b.
The reflection surfaces 4a, 4b, which irradiate the light radiated from the light a, 2b and introduced into the light introducing portions 3a, 3b and reflect the light upward in FIG.
4b is formed. The reflecting surfaces 4a and 4b are formed as surfaces having a substantially conical shape as a whole.

In FIG. 1, reference numeral 5 denotes a light irradiator formed in a substantially ring shape. Light from left and right light sources 2a and 2b is guided to the left half and the right half of the light irradiator 5, respectively. Body 1a, 1b,
The light is guided through the reflection surfaces 4a and 4b. Reference numeral 6 denotes an opening that penetrates above and below the light guides 1a and 1b through the center of the light irradiation section 5.

In this example, each of the light guides 1a and 1b has an elliptical side edge having the pointer axis and the light sources 2a and 2b as focal points, and the inner surface of the side edge is used as a reflection surface to form the light sources 2a and 1b. The light from 2b is condensed so that the light can be guided over the entire circumference of the light irradiation section 5. As described above, the light is guided over the entire circumference of the light irradiation unit 5 because the pointer rotates around the pointer axis within a predetermined angle range and the light receiving unit also rotates around the pointer axis. This is because the required light amount is received even at the pointer position.

FIGS. 11 (a) and 11 (b) correspond to FIGS.
(A), (b) is a modified example in which the shape of the light guides 1a and 1b and the method for guiding the light from the light sources 2a and 2b traveling inside the light guides 1a and 1b over the entire circumference of the light irradiation section 5 are different. is there. In this conventional example, in order to guide the light from the light sources 2a, 2b to the entire periphery of the light irradiating section 5, particularly to the side, to the inner end portions of the substantially rectangular plate-like light guides 1a, 1b, a step is formed in the circumferential direction. A plurality of reflecting surfaces 4a and 4b are formed so as to have a shape (actual fairness 2).
-20715).

FIGS. 12 (a) and 12 (b) show the case where the reflecting surfaces 4a and 4b for guiding light to the entire circumference of the light irradiation section 5 are formed by the same inclined surface 4 formed on the light guide 1. FIG. In such a structure, one light source 2 is sufficient.

[0010]

However, FIG.
The conventional examples shown in FIG. 12 to FIG. 12 all have a problem in that the size of the apparatus is increased and the light from the light source is not effectively used. That is, in the structure shown in FIGS. 10 and 11, since the light guides 1a and 1b and the light sources 2a and 2b are required on the left and right around the pointer axis, not only the number of parts increases but also the size in the plane direction increases. Can not avoid.

In the structure shown in FIGS. 10 and 11 described above, each light source 2 traveling in each light guide 1a, 1b is provided.
Of the light from the light sources a and 2b, the light incident on the reflection surfaces 4a and 4b at a critical angle or more is totally reflected by the reflection surfaces 4a and 4b and guided from the light irradiation unit 5 to the pointer light receiving unit. On the other hand, the reflection surface 4
The light incident on the a, 4b at less than the critical angle is reflected by the reflecting surfaces 4a, 4b.
The light is refracted at b and reaches the inside of the opening 6 and escapes below the pointer shaft (the back of the dial). Therefore, in such a conventional example, it cannot be said that the light from the light sources 2a and 2b is effectively used, and it is necessary to provide a light source for at least each of the light guides 1a and 1b.

The structure shown in FIG. 12 eliminates the above-mentioned problems of an increase in the number of components and an increase in the plane direction, and can be constituted by one light source 2 and the light guide 1. However, since the reflecting surfaces 4a and 4b need to be formed by one surface 4, the thickness is required to be approximately double. Therefore, in such a conventional example, enlargement in the thickness direction is unavoidable, and there is also a waste of light that bends and escapes from the reflecting surfaces 4a and 4b at a critical angle or less.

The problem with the pointer lighting device as described above is that the rotation range of the pointer extends over 180 ° and the light source irradiates an area of 180 ° or more of the light irradiating portion of the light guide for pointer illumination. When it is necessary to guide the light, a structure like the above-mentioned conventional example must be adopted.

The present invention has been made in view of such circumstances, and when the rotation range of the pointer extends over 180 °, light from a single light source can be efficiently guided, and the number of parts is small. It is an object of the present invention to provide an instrument pointer lighting device which is small and simple in structure, and which can reduce the size and thickness of the entire device.

[0015]

SUMMARY OF THE INVENTION In order to meet such an object, a pointer illuminating device for an instrument according to the present invention has a light receiving portion which rotates on a dial plate having an indication display portion and faces a shaft support portion. In a meter provided with a pointer having a pointer light guide, a light irradiating section facing the turning trajectory of the light receiving section at one end and a light introducing section facing a light source at the other end are provided. A pointer illumination light guide provided on the back side, and reflecting a part of the light emitted from the light source to a half-circumferential portion near the light source on the back side of the light irradiation unit of the pointer illumination light guide. First
And a second reflecting portion that reflects the remaining part of the light emitted from the light source in a half-circumferential portion on the back side of the light emitting portion and on the side opposite to the light source; The second reflecting portion is constituted by a slope inclined substantially in parallel.

According to the present invention, the light emitted from the light source is made incident from the light introducing portion of the light guide for illuminating the pointer, and the incident light is advanced in the light guide. Of the light reaching the first reflector, the light incident at a critical angle or more is reflected on the slope of the first reflector and guided to the light irradiator, and from the light irradiator to the light receiver side of the pointer. be introduced. Also, of the light that has reached the first reflecting portion, light that is incident at a critical angle or less is refracted on the slope and proceeds, is guided to the second reflecting portion, is reflected on the slope, and is reflected on the light irradiation portion. At last, it is introduced to the light receiving portion side of the pointer. The light receiving portion of the pointer is a first light guide to the light irradiation portion.
Alternatively, of the light reflected by the second reflector, the light corresponding to the turning position of the pointer is received.

Here, as an adjusting means when the light amount from the light source is unbalanced in the half-peripheral portion on the light source side and the half-peripheral portion on the semi-light source side of the light irradiating section, the light emitting surface on the larger light intensity side The surface of the light source is subjected to graining and satin finishing, or the light source is changed and the direction of the main axis light is changed and introduced into the light guide.
It is conceivable to irradiate the light on the surface on the side of the second reflection unit instead of the side of the reflection unit, or to change the inclination angles of the slopes in the first and second reflection units.

According to a first aspect of the present invention, in the instrument for illuminating a pointer according to the present invention, the light guide for illuminating the pointer and the light source are positioned substantially at the center of a rotation range of a light receiving portion of the pointer which rotates on the dial. Characterized by being arranged along a ray passing through.

According to the present invention, a part of the light that enters the first reflecting portion at a critical angle or less and travels while being refracted is blocked by the pivot portion of the pointer, but this portion is not rotated by the pointer light receiving portion. Falls into the range. In other parts, the light reflected by the first or second reflection unit is guided to the light irradiation unit and received by the light reception unit.

[0020]

1 to 3 show one embodiment of a pointer illuminating device for a meter according to the present invention. In these drawings, in this embodiment, the present invention is a transmission illumination type meter. Description will be made using an example used for illumination of a pointer in a certain in-vehicle combination meter (exemplifying a speedometer).

In FIG. 1, an analog speedometer 10 of a combination meter to which the present invention is applied is shown in FIG.
As shown in the figure, there is an instruction display section 11 consisting of numerical values corresponding to the scale for performing the speed display and other numbers, characters, symbols, etc. necessary as a meter, and other portions are shaded and printed. A dial 12 formed in a sheet shape from a translucent material, and a pointer shaft 14 rotatably supported by a pointer shaft 14 through an opening 13 formed in the center of the dial 12 to indicate the indication at the tip of the pointer. There is provided a pointer 15 pointing to the part 11.

The pointer 15 includes a pointer light guide 16 having a light receiving portion 16a for receiving light emitted from the back side of the dial 12 and formed in a pointer shape from a light-guiding material. FIG.
(B) Reference numeral 17 denotes a cap formed of a light-shielding material for holding the base end portion of the pointer light guide 16. The cap 17 is provided on the shaft 17 a provided on the cap 17 and on the back side of the dial 12. The pointer shaft 14 is constituted by the needle shaft from the pointer driving mechanism 18.

An opening 13 slightly larger than the pointer 15 is formed in the pointer shaft supporting portion of the dial 12 so as to correspond to the rotation locus of the light receiving portion 16a of the pointer light guide 16 in the pointer 15. In addition to the above, the speedometer 10 includes a meter case, a meter cover, a light guide for a dial illumination, a light source, and the like for illuminating and displaying the instruction display unit 11 with light transmitted from the back surface of the dial 12. However, detailed illustration and description here are omitted.

According to the present invention, at one end, a light irradiating section 21 facing the opening 13 from the back side of the dial 12 is provided.
A pointer illumination light guide 20 having a light introduction part 23 at the other end facing the light source 22, and a light source 22 for irradiating the light introduction part 23 of the pointer illumination light guide 20 with light are provided.

Light irradiating section 21 of pointer light guide 20
And a half-circumferential portion near the light source 22 (FIG. 2,
A first reflecting portion 31 that reflects a part of the light emitted from the light source 22 is provided on a right side portion in FIG. 3, and a half-circumferential portion on the back side of the light emitting portion 21 and on the side opposite to the light source 22 ( 2 and 3) is provided with a second reflector 32 that reflects the remaining part of the light emitted from the light source 22. The first and second reflecting portions 31 and 32 are constituted by inclined surfaces that are inclined substantially in parallel.

Here, in this embodiment, the first and second reflecting portions 31 and 32 are arranged along the half circumference of the light irradiation portion 21 as shown in FIGS. 3 (a) and 3 (b). It is formed by a plurality of formed inclined surfaces.

The light guide 20 is made of a colorless and transparent acrylic resin, polycarbonate resin or the like having a light guiding property. For example, the light guide 20 formed of an acrylic resin has a refractive index of 1.49 and a critical angle of 42.16.
°. The light that is introduced into the light guide 20 and travels on the inclined surface of the first reflecting portion 31 has an angle larger than the critical angle (a total reflection range of 47.84 ° in FIG. 2). 2), the light is totally reflected by the surface of the first reflecting portion 31 as is apparent from the light beam indicated by a in FIG. 2 and is introduced into the light irradiation portion 21 in the upper part of the drawing.

On the other hand, light (light ray b) incident at an angle smaller than the above-mentioned critical angle (for example, 28.33 ° in the figure)
Is refracted on the surface of the first reflecting portion 31 and is transmitted to the outside of the light guide 20. Among them, the light beam b incident at an angle of, for example, 28.33 ° with respect to the normal to the surface of the first reflecting portion 31 is refracted at 45 ° with respect to the normal as shown in FIG. 2 toward the slope of the reflecting portion 32, and the surface of the second reflecting portion 32 is totally reflected in the same manner as the first reflecting portion 31,
The light is introduced into the light irradiation unit 21 in the upper part of the figure.

That is, on the inclined surfaces (first and second reflecting portions 31 and 32) of the light guide 20, the refractive index differs depending on the material of the light guide 20, but the refraction angle is n = sin. It is determined by i / sin r. Here, i is an incident angle of an angle i ° formed with the normal on the reflecting surface, and r is a refraction angle formed by r ° with the normal on the reflecting surface. If the incident angle i is 90 °, the refraction angle r becomes the critical angle.

Here, compared with the light totally reflected by the surface of the first reflecting portion 31 from the light source 22, the second reflecting portion 3
The light reflected by the second surface reflects the light inside the light guide 20 and the first light.
The reflection luminance is apt to be reduced because the light is attenuated by refraction or the like on the surface of the reflection portion 31. Therefore, as shown by reference numeral 35 in FIG.
3 is subjected to a graining process or a satin finish process (marked 35 in FIG. 3), and by adjusting the light transmission amount of this portion, the brightness is substantially equal to that of the left half 21b on the low brightness side. Good to do.

That is, the amount of light reflected on the surface of the first reflector 31 and guided to the light irradiator 21 is balanced by taking into account the attenuation of the light in the optical path before reaching the second reflector 32. It may be adjusted so that

As described above, the following modified examples can be considered as means for adjusting the difference in luminance (light quantity imbalance) between the left and right sides of the light irradiation section 21. As shown in FIG.
By setting the optical axis for irradiating the surface of the second reflecting portion 32 to be the principal axis light of the directional characteristic (or light distribution characteristic) of the light source 20 (see the light ray c), the luminance on the surface of the first reflecting portion 31 is improved. The difference in brightness from the brightness on the surface of the second reflecting portion 32 is reduced, and
The illumination quality at the time of turning can be improved.

That is, as described above, the light irradiation surface 21 (21a, 21a, 21b) of the light reflected by the first and second reflection portions 31, 32 is provided.
When the luminance difference in 21b) is reduced, the amount of light introduced from the light receiving unit 16a is made substantially equal even if the pointer 15 is rotated, so that a change in brightness depending on the pointer position can be reduced. In addition, d in FIG. 4 is a light beam from the light source 22 reaching the surface of the first reflecting portion 31.

As the light source 22 described above, for example, an LED
FIG. 7 shows the directivity characteristics when using. For example, in FIG. 4 described above, the amount of light applied to the surface of the first reflecting portion 31 is an LED (light source 22) having the directivity shown in FIG. 7 and is 45 ° to 28.33 with respect to the main axis light. ° 16.
When irradiated at 67 °, the brightness becomes about 80% when the brightness of the main axis light is 100%. Here, 28.33
° is the light guide 20 when refracted by the surface of the first reflecting portion 31.
In the horizontal direction (c in the figure), and is totally reflected by the surface of the second reflecting section 32, and is the left half of the light irradiation section 21 (21 in the figure).
This is the angle at which the light reaches b).

FIG. 8 shows light distribution characteristics when the light source 22 is a light bulb. Here, the main axis light of the light bulb is
2 shows a state in which the light emitting device is arranged toward the light introducing unit 23 and has directivity. Even if a light bulb having such light distribution characteristics is used, the same operation and effect can be obtained as long as it has directivity similarly to the LED described above.

FIG. 5 shows that the angle of inclination of the surface of the first reflecting portion 31 is set to an angle of 45 ° or less, for example, 42.16 °, and the angle of reflection is different from that of the surface of the second reflecting portion 32. Indicates the status. Here, the angle at which the light is refracted by the surface of the first reflecting portion 31 and reaches the second reflecting portion 32 is 26.77 ° which is smaller than the angle of 28.33 ° in the above-described embodiment. The attenuation of the refracted light is reduced, and the second reflecting portion 32
The amount of light totally reflected on the surface can be improved.

In this way, the amount of light totally reflected on the surface of the first reflecting portion 31 is reduced, and the amount of light transmitted through the first reflecting portion 31 and guided to the second reflecting portion 32 is reduced. Can be increased. Then, with this configuration, the light is reflected by the first and second reflecting portions 31 and 32 and is reflected by the light irradiation portion 21 (21).
a, 21b) can be made substantially uniform in the amount of light guided to it.

FIG. 6 shows a case in which the main axis light of the light source 22 is inclined and provided as a light beam reaching the surface of the second reflecting portion 32 in the embodiment of FIG. 5 described above. ing. With this configuration, the above-described effect due to the inclination of the main axis light and the effect due to the inclination of the surface of the first reflecting portion 31 are synergized. And also with such a structure, like the above-described respective examples, the first,
It goes without saying that the luminance difference of the light guided to the light irradiation unit 21 via the second reflection units 31 and 32 can be adjusted to a required state.

Here, in FIG. 1 described above, the pointer light guide 20 and the light source 22 are arranged on the back surface of the dial 12 so that the light receiving portion 16a of the pointer 15 which rotates on the dial 12 can rotate. Are arranged along a ray (a line extending in the radial direction from the center of rotation) that passes through substantially the center of.

According to such a configuration, the first reflecting portion 3
Although a part of the light which enters at 1 below the critical angle, refracts and travels is blocked by the pivotal support of the pointer 15, this part corresponds to the non-rotational range of the pointer light receiving unit 16a. In other portions, the light reflected by the first or second reflecting portions 31 and 32 is guided to the light irradiation portions 21 (21a and 21b), and the light receiving portion 1
6a can receive light.

That is, by arranging the pointer-illuminating light guide 20 and the light source 22 in such an arrangement position, the pointer-light guide 16 always provides appropriate pointer illumination regardless of the rotating position of the pointer 15. Can be performed. In particular, such an advantage is that the rotation range of the pointer 15 is 180 °.
In the case described above, it is effective to efficiently guide the light from the single light source 22 to illuminate the pointer 15.

FIG. 9 shows a modification of FIG. 1 described above. In this example, the holding position of the light receiving portion 16a of the pointer 15 by the cap 17 is different. Since the rotation range of the light receiving portion 16a is located in a point-symmetric state on the opposite side to the rotation range of the pointer 15, the pointer illumination light guide 20 and the light source 22 provided on the back surface of the dial 12 are provided. Is located on the opposite side of FIG. The rotation range of the light receiving section 16a is indicated by a dashed line in the figure.

The present invention is not limited to the structure described in the above embodiment, and the shape, structure, etc. of each part can be appropriately modified or changed. For example, in the pointer lighting light guide 20 which is a lighting device, the first and second reflecting portions 3 are provided.
The brightness of the light reflected on the slopes in the light irradiators 2 and 1
As the balance adjusting means in the case where the first and second reflectors 1 and 2 are different, the inclination angles of the surfaces of the first and second reflecting portions 31 and 32 may be changed, or the position of the light source 22 and the direction of the principal axis light may be changed.

In the above embodiment, the pointer 15
As an example, a case is described in which a pointer light guide 16 made of a light-guiding material and a cap 17 made of a light-shielding material that covers the base end thereof are formed. However, the present invention is not limited to this. As is widely known from U.S.A., it may be a guide having various structures. In short, it is sufficient if the pointer has a light guide so that the pointer can be illuminated by the light from the lighting device.

Further, in the above-described embodiment, the speedometer in the vehicle-mounted combination lamp which is an instrument provided with the pointer 15 for illuminating the pointer is illustrated. However, the present invention is not limited to this. If it ’s an instrument pointer,
It is applicable to various instruments used in various fields.

The dial 12 is, for example, a panel made of a translucent material and having a light-shielding layer formed on its surface except for the indication display section 11. However, the present invention is not limited to this. The instruction display unit 11 may be formed by punching out a plate, and a light diffusion sheet may be attached to the back surface.

[0047]

As described above, according to the pointer illuminating device for a meter according to the present invention, the pointer that rotates over the range of 180 ° or more around the pointer axis so as to point to the indication display portion on the dial is provided. By using a single light source and a pointer-shaped light guiding body for pointer illumination having a simple shape, it is possible to easily and surely illuminate and display with substantially uniform brightness regardless of the rotational position. Further, according to the present invention, it is possible to reduce the size of the pointer illumination light guide in the surface direction and the thickness in the thickness direction.

According to the present invention, the light from the light source can be efficiently guided to the light irradiating section by the first and second reflecting sections provided on the pointer illuminating light guide. Irrespective of the rotation position, illumination can be performed with substantially uniform luminance and light amount.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows one embodiment of a pointer illumination device for a meter according to the present invention, in which (a) is a schematic front view of a meter using a pointer illuminated by the illumination device, and (b) is a cross-sectional view of a main part thereof. FIG.

FIG. 2 is a cross-sectional view of a main part in which a light guide is enlarged in the pointer lighting device of FIG. 1;

FIG. 3 shows the light guide for pointer illumination used in FIG. 1,
(A) is a front view, (b) is a side sectional view.

FIG. 4 is a cross-sectional view of a main part of an enlarged part of a light guide, showing another embodiment of the pointer illumination device for a meter according to the present invention.

FIG. 5 is a cross-sectional view of a main part of an enlarged part of a light guide, showing another embodiment of a pointer illumination device for a meter according to the present invention.

FIG. 6 is a cross-sectional view of a main part of a further embodiment of a pointer lighting device for an instrument according to the present invention, in which a light guide is enlarged.

FIG. 7 is a diagram showing directional characteristics of an LED used as a light source for pointer illumination.

FIG. 8 is a characteristic diagram showing light distribution characteristics of a light bulb used as a light source for pointer illumination, which is arranged with directivity.

FIGS. 9A and 9B show a modified example of the instrument to which the pointer lighting device shown in FIG. 1 is applied, wherein FIG. 9A is a schematic front view of the instrument, and FIG.

FIG. 10 shows an example of a conventional instrument pointer lighting device;
(A) is a front view showing a pointer illumination light guide and a light source,
(B) is a side sectional view thereof.

11A and 11B show another example of a conventional instrument pointer lighting device, and FIG. 11A is a front view showing a pointer illumination light guide and a light source;
(B) is a side sectional view thereof.

12A and 12B show another example of a conventional instrument pointer lighting device, and FIG. 12A is a front view showing a pointer illumination light guide and a light source;
(B) is a side sectional view thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Speedometer (instrument), 11 ... Instruction display part, 12 ... Dial, 13 ... Opening, 14 ... Pointer shaft, 15 ... Pointer, 16 ... Pointer light guide, 16a ... Light receiving part, 17 ... Cap, 18 ... Pointer driving mechanism, 20 ... Light guide for pointer lighting, 21 (21a,
21b): Light irradiation unit, 22: Light source, 23: Light introduction unit, 3
Reference numeral 1 denotes a first reflection portion (reflection surface), 32 denotes a second reflection portion (reflection surface).

Claims (2)

[Claims] 1. Rotating on a dial having an instruction display unit,
In a meter provided with a pointer having a pointer light guide having a light receiving portion facing the shaft support portion, a light irradiating portion opposed to a rotation trajectory of the light receiving portion is provided at one end portion,
The other end has a light introducing section facing the light source, and includes a pointer illumination light guide provided on the back side of the dial, and the back side of the light irradiation section of the pointer illumination light guide. A first reflecting portion that reflects a part of the light emitted from the light source to a half-circumferential portion near the light source, and a half-circumferential portion on the back side of the light irradiating portion and on the side opposite to the light source is irradiated from the light source. And a second reflector for reflecting the remaining part of the light, and the first and second reflectors are formed by slopes inclined substantially in parallel. 2. The pointer illumination device for a meter according to claim 1, wherein the pointer illumination light guide and the light source are positioned substantially at the center of a rotation range of a light receiving portion of the pointer that rotates on the dial. A pointer illuminating device for an instrument, wherein the illuminating device is arranged along the passing radiation.