JP5884686B2 - Luminous pointer instrument - Google Patents

Description

  The present invention relates to a light emission pointer instrument that illuminates a pointer using a light source.

  2. Description of the Related Art Conventionally, there is known a pointer illumination device that is used in an automobile meter or the like and can reduce loss on a reflecting surface of a pointer and emit light with high luminance (for example, Patent Document 1).

  The pointer illumination device of Patent Document 1 includes a light-transmitting pointer member having a pointer reflecting surface that reflects light incident on a predetermined incident surface (hereinafter also referred to as a light receiving surface) and guides the light to a tip of the pointer. A light source disposed around the drive shaft of the pointer member and a light-transmissive light guide member that guides light from the light source to the light receiving surface of the pointer member.

  Further, in the pointer illumination device, the light guide member includes a first light guide reflection surface provided on the drive shaft side, and a second light guide reflection surface provided on the side away from the drive shaft side. And is provided to guide the light reflected by the first light guide reflection surface and the second light guide reflection surface to the light receiving surface, and the second light guide reflection surface is In order to guide the light from the light source to the first light guide reflection surface while reflecting and condensing the light, the first light guide is provided on a surface whose angle with the central axis of the light source increases as the distance from the light source increases. The light reflecting surface is provided on a surface whose angle with the central axis of the light source increases as the distance from the light source increases so that the light from the second light guiding reflecting surface is reflected and converted into a substantially parallel light beam. Yes.

  With such a configuration, since the amount of light taken from the light source into the light guide member is increased as much as possible, even if the light receiving surface of the light guide member is increased, the exit surface can be reduced while ensuring high efficiency.

  The pointer illumination device has a light-shielding cap on the reflecting surface (viewing side) for reflecting the light from the incident surface so that the light taken from the light receiving surface of the pointer member is not directly exposed to the viewing side. Is provided.

JP 2008-197083 A

  By the way, in the pointer illumination device as described above, in order to improve the design, a pointer light shielding cap (or a shape like a seal that blocks light instead of the light shielding cap) is included as much as possible: There is a demand to make it smaller. In order to meet this requirement, for example, it is conceivable to reduce the light guide configuration (light receiving surface, etc.) of the pointer.

  However, the configuration of a general pointer illumination device as described in Patent Document 1 described above, that is, a pointer, a light source for illuminating the pointer, and a light guide provided to guide the light source and the pointer. The pointer is illuminated by emitting light from the light source incident from the light receiving surface of the tip of the pointer having a light-shielding portion (also referred to herein as an indicator) through the light guide. Such a configuration has the following problems.

  In other words, the light incident on the light guide from the light source passes through the internal reflection from various directions even if the light is focused by concentrating the shape of the reflection surface inside the light guide to further narrow the emission angle. Therefore, the light finally emitted from the light guide has various optical paths from the position near the drive axis to the position away from it. Therefore, in the case of using the configuration of a general pointer illumination device as in the cited document 1, light may be emitted from the light guide in different directions. For this reason, if the structure of the light receiving surface of the pointer indicating portion is made smaller in order to form a light shielding portion smaller, the incident efficiency on the incident surface is lowered. As a result, there has been a problem that the illumination brightness of the pointer indicating portion is reduced.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a light emitting pointer instrument that can suppress a decrease in illumination brightness of the pointer indicating portion even if the structure of the light receiving surface of the pointer indicating portion is further reduced. .

In order to achieve the above object, a light emitting pointer instrument according to claim 1 is arranged around a drive bearing connected to a drive shaft and having a translucent indicator, and a drive bearing of the drive shaft of the pointer. And a light guide provided between the light source and the pointer. The light receiving surface for guiding the light emitted from the light source to the pointing unit is formed as a surface substantially perpendicular to the axis of the drive shaft, and the light source is at least partially out of the position facing the light receiving surface. And it is arrange | positioned in the position of predetermined distance with respect to a drive bearing. The light guide is disposed opposite to the light source, and receives the light emitted from the light source from the tip of the corner formed at a substantially acute angle, and the reflection that reflects the light incident from the light receiving unit. And a light output surface that emits light reflected by the reflecting surface toward the light receiving surface of the pointer.

  According to this configuration, by having the light receiving portion that is incident from the tip of the corner portion that is formed at a substantially acute angle inside the light guide, the light from the light source is guided almost in a bundle and emitted from the light exit surface. Can do. Therefore, even when it is desired to make the structure of the light receiving surface of the pointer indicating portion smaller, it is possible to suppress a decrease in illumination luminance of the pointer indicating portion.

  The light emission indicator meter according to claim 2 is characterized in that the light source is a point light source, and the light receiving portion is disposed relative to the center of the point light source.

  For example, in the case of a point light source (light emitting element) such as an LED, the luminance of the central portion of the light source is the highest. Therefore, according to this configuration, the light from the light source can be used for illumination of the pointer more efficiently.

  The light emission indicator meter according to claim 3 is characterized in that the light receiving portion is disposed so as to be substantially in contact with the center of the point light source so that the light at the center of the point light source can enter.

  According to this configuration, in order to receive light in the peak light state of the point light source, they are arranged so as to be in close contact with each other. Since the corner of the light receiving portion of the light guide of the present invention is formed with a substantially acute angle, it is particularly effective to improve the light receiving efficiency of the light guide so that light can be received in the peak light state from the tip of the corner. is there.

  Furthermore, the reflection surface of the light guide of the light emission pointer meter according to claim 4 is parallel to the first reflection surface and the first reflection surface where the light incident from the light receiving portion into the light guide is first reflected. And a second reflecting surface capable of emitting the light reflected by the first reflecting surface from the light emitting surface.

  According to this configuration, since light passing through the inside of the light guide can be emitted with the number of reflections (two times), loss due to reflection (reduction in light guide efficiency) can be reduced.

  Further, the light emitting pointer instrument according to claim 5 is arranged so that one end of the light receiving portion and the first reflecting surface is in contact with the vertical line when it is assumed that a vertical line is drawn in the direction of the pointer based on the light source. The corner portion formed at a substantially acute angle of the portion is formed based on an angle at which the first reflecting surface can totally reflect light.

  According to this configuration, since the first reflecting surface of the light guide can be optimally reflected, loss due to light leakage from the first reflecting surface to the outside of the light guide (reduction in light guide efficiency) can be reduced. it can.

  Further, the light emitting pointer instrument according to claim 6 is provided so as to cover the pointer reflecting surface for reflecting the light incident from the light receiving surface in the direction of the pointing unit and the viewing side of the pointer reflecting surface, and is incident on the light receiving surface. The light-emitting device further includes a light-shielding portion that shields light from being directly exposed to the viewing side.

  According to this configuration, even when the size of the light-shielding portion (for example, the light-shielding cap) is further reduced, it is possible to suppress a decrease in illumination luminance of the pointer instruction portion.

It is sectional drawing in the housing | casing of the speedometer in embodiment of this invention. It is the perspective view which looked at the light guide in FIG. 1 and the prism stand from diagonally upward on the pointer side. It is sectional drawing of the principal part in FIG. FIG. 3 is an enlarged cross-sectional view of a light guide and a pointer light source in the main part of FIG. 2.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which the present invention is applied to a speedometer, which is one of light emission indicator instruments for automobiles, will be described with reference to the drawings. The speedometer is disposed in an instrument panel (not shown) in front of the driver's seat. Hereinafter, the overall configuration of the speedometer will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a cross-sectional view of the inside of a housing (not shown) of a speedometer 1 in the embodiment.

  First, as shown in FIG. 1, the speedometer 1 is provided with a driving device 5 formed by projecting a drive shaft 3 supported by a drive bearing 2 on the viewing side (provided in a protruding state), and on the viewing side. The circuit board 6 is located on the upper side (drive bearing 2 side) of the drive device 5. Moreover, it has the dial 8 supported by the cylinder 7 provided on the circuit board 6 by the side of visual observation, and the dial 8 has the character and the scale formed in the scale area 8a. A pointer 4 is connected to the tip of the drive shaft 3, and this pointer 4 is configured to be rotationally driven by a driving device 5 so as to be rotatable in a plane substantially parallel to the surface side of the dial 8. Yes.

  Further, the speedometer 1 has a pointer light source 9 disposed on the circuit board 6 inside the cylindrical body 7 and a light guide 10 for guiding the irradiation light of the pointer light source 9 to the pointer 4. ing. A dial light source 11 for illuminating characters and scales in the scale area 8 a of the dial 8 is provided on the circuit board 6 outside the cylinder 7.

  The pointer 4 includes a light transmitting (= translucent) resin (for example, acrylic, polycarbonate, etc.) as a basic configuration including the instruction unit 4b, and the irradiation light of the pointer light source 9 is incident through the light guide 10. A pointer light receiving surface 4a is provided, and a pointer reflecting surface 4c that reflects and illuminates the irradiation light incident from the pointer light receiving surface 4a toward the pointing unit 4b is provided. Further, the pointer 4 is provided with a light shielding cap 12 serving as a light shielding portion so as to cover the viewing side of the pointer reflecting surface 4c of the pointer 3 so that the irradiation light taken from the pointer light receiving surface 4a is not directly exposed to the viewing side. Yes. In this way, the irradiation light emitted from the pointer light source 9 is finally emitted from the instruction unit 4b to the viewing side, thereby illuminating the pointer.

  The drive device 5 is mounted so that the drive shaft 3 penetrates the circuit board 6. The drive device 5 is composed of an electric actuator such as a stepping motor or a cross coil type rotary machine, and rotates the drive shaft 3 by an angle corresponding to an external electric signal (here, a speed signal of an automobile) although not shown. Is.

  The circuit board 6 is a well-known printed circuit board made of epoxy resin or the like, and various electronic components (for example, a capacitor, a resistor, a transistor, an IC, etc.) are mounted (not shown). Although not shown, a driving circuit for driving the driving device 5 according to an electric signal from the outside is formed and wired so that power can be supplied to the pointer light source 9 and the dial light source 11. Yes.

  The cylindrical body 7 is formed in a cylindrical shape with a white synthetic resin having a high light reflectance in order to increase the light reflection efficiency of the peripheral wall to the pointer 4. Inside the cylindrical body 7, a pointer light source 9, a light guide 10, a drive bearing 2, a drive shaft 3, and a part of the pointer 9 on the pointer light receiving surface 4a side are accommodated.

  The dial 8 is formed of a well-known printed display board, and a diffusion plate (not shown) for diffusing the light emitted from the dial light source 11 disposed on the circuit board 6 is provided on the back side layer of the dial 8. It has been. The illumination light of the dial light source 11 allows the characters and scales (corresponding to the rotation of the pointer 6) in the scale area 8a to be displayed in a light-emitting manner, and the pictorial diagrams such as marks in areas other than the scale area 8a ( (Not shown) can also be displayed.

  The pointer light source 9 is not shown in FIG. 1, but four LEDs (L1 to L4) serving as point light sources are arranged on the circuit board 6 at substantially equal intervals in the circumferential direction around the drive shaft 3. ing. That is, in the cross-sectional view of FIG. 1, two (L1, L3) of the pointer light sources 9 (L1 to L4) are shown, and (L2, L4) not shown is the same light source as (L1, L3). It has a structure and light emission characteristics. In order to make the explanation easier to understand, explanation will be given using the pointer light sources 9 (L1, L3), but the explanation is similarly applied to the pointer light sources 9 (L2, L4).

  The light guide 10 is provided between the pointer light receiving surface 4 a of the pointer 4 and the light sources 9 (L 1, L 3) of the pointer 4, and the light of the pointer light sources 9 (L 1, L 3) is reflected through light reflection inside the light guide 10. The irradiation light is configured to enter the pointer light receiving surface 4a. A prism base 10 a is provided to support the light guide 10 from the circuit board 6.

  Regarding the speedometer 1 (light emitting pointer instrument) as described above, the basic configuration of the pointer 4 that can be illuminated, the optical principle, and the control method of the pointer and the light source are disclosed in Japanese Patent Laid-Open No. 2003-194592. Since the well-known technique described in the gazette is used, detailed description is omitted here.

  Next, the overall shape of the light guide 10 and the prism base 10a will be described with reference to FIG. FIG. 2 is a perspective view of the light guide 10 and the prism base 10a as viewed obliquely from the pointer side (the sectional view II-II in FIG. 1 corresponds to the II-II portion in FIG. 2). .

  The light guide 10 is formed of a transparent synthetic resin (here, acrylic resin) in a donut shape in the axial direction of the drive shaft 3 so as to surround the drive shaft 3 around the drive shaft 3 (one-dot chain line). Has been. The prism base 10 a is formed as a support around the drive shaft 3 so as to surround the lower portion of the first reflecting surface 10 c of the light guide 10. In addition, pointer light sources 9 (L1 to L4) are arranged at a lower portion of the light guide body 10 at substantially equal intervals (approximately 90 ° intervals) in the circumferential direction around the drive shaft 3. The irradiation light emitted from the pointer light sources 9 (L1 to L4) is emitted to the prism light exit surface 10e through light reflection inside the light guide 10. The prism light exit surface 10e is formed to face the pointer light receiving surface 4a of FIG. 1 substantially horizontally.

  Next, the characteristic part of the light guide 10 is explained in full detail using FIG.3 and FIG.4.

  FIG. 3 is an enlarged view of a portion including the light guide 10 which is a main part in the cross-sectional view of the speedometer 1 of FIG.

  Note that the pointer light receiving surface 4a for guiding the inside of the bearing of the pointer 4 is formed to be a surface substantially perpendicular to the axis of the drive shaft 3, and the light guide 10 is formed as shown in FIG. The light receiving surface 4aa that is in contact with the drive shaft 3 and the light receiving surface 4ab that is slightly apart from the drive shaft 3 are provided. The reason that the pointer light receiving surface 4a has two light receiving surfaces (4aa and 4ab) is that the pointer light receiving surface 4a of the pointer 4 is all set to 4aa (that is, the shape of 4ab is 4aa) and is molded at the time of manufacture. It takes time. For this reason, all the pointer light receiving surfaces 4a may be 4aa, but in this embodiment, the shape is provided with a surface 4ab away from the light guide 10 whose material is shaved.

  The pointer light source 9 (L1, L3) (not described, but the description of the pointer light source 9 in FIG. 3 is also applied in common to the other L2, L4) is provided on the circuit board 6 on the drive shaft 3 The drive bearing 2 is disposed at a position separated by a predetermined distance.

  In the first place, if the pointer light source 9 (L1, L3) can be provided near the drive shaft 3 (for example, a position in contact with the drive bearing 2), the pointer light source 4a of the pointer 4 is directly (that is, a straight line). Therefore, the light guide 10 that makes the irradiation light incident by reflection should be unnecessary. However, for example, when it is desired to use an LED with strong output light in the pointer light source 9 (L1, L3), the drive shaft 3 is driven as in the present embodiment for convenience of the light source design specifications (LED size, etc.). It is necessary to dispose the light guide 10 at a predetermined position slightly away from the bearing 2.

  That is, in the present embodiment, the pointer light source 9 (L1, L3) is at a position where at least a part of the light source deviates from the position facing the pointer light receiving surface 4a (particularly 4aa) and to the drive bearing 2. Are arranged at a predetermined distance. In addition, the position of this predetermined distance is a position which does not contact the drive bearing 2 at least.

  The irradiation light of the pointer light sources 9 (L1, L3) arranged in this manner is efficiently condensed in the light guide 10 which is a condensing prism and is incident on the pointer light receiving surface 4a of the pointer 4. In addition, the shape of the light guide 10 (detailed in FIG. 4) is devised.

  4 is an enlarged cross-sectional view of the light guide 10 and the pointer light source 9 (L1) in the main part of FIG. 3 (note that in FIG. 4, this is limited to L1, but for the pointer of FIG. The description of the light source 9 is applied in common to the other L2 to L4). The cross-sectional view of the light guide 10 shown in FIG. 4 is a diagram excluding the pedestal and the L3 side cutaway view of the trapezoidal acrylic resin prism shown in FIG. 2 cut in the II-II direction. As a result, the cross-sectional view of the light guide in FIG. 4 is shown as one trapezoidal shape.

  Of the trapezoidal shape of the light guide 10 of FIG. 4, the upper bottom portion is the first reflecting surface 10c, the lower bottom portion is the second reflecting surface 10d, one end of the lower bottom portion is the prism light receiving unit 10b, and the prism light receiving unit 10b. A portion formed by one end and an upper bottom of the lower bottom portion on the opposite side is called a prism light exit surface 10e. When the light from the light source is incident on the prism light receiving unit 10b, the incident light is reflected by the first reflecting surface 10c and the second reflecting surface 10d and is emitted from the prism light emitting surface 10e.

  In FIG. 4, a vertical line (long broken line) is drawn as a hypothetical line in the direction of the pointer side with reference to the light source at the center of the light source of the pointer light source 9 (L1). On this vertical line, it arrange | positions so that the end of the prism light-receiving part 10b and the 1st reflective surface 10c may contact | connect. Here, the angle α formed by the intersection of the vertical line and the second reflecting surface 10d of the light guide 10 corresponds to a substantially acute corner of the prism light receiving unit 10b. An angle formed by the intersection of the vertical line and the first reflecting surface 10c of the light guide 10 is referred to as an angle β. As will be described later, this angle β is used when adjusting to an ideal angle (total reflection angle) at which light incident from the prism light receiving unit 10b and hitting the first reflection surface 10c can be totally reflected.

  The light guide 10 is the portion of the irradiation light having the highest luminance among the LED lights of the light source 9 (L1) for pointers, and here the central portion (long broken line) of the light source is the corner of the prism light receiving unit 10b of the light guide 10. It is arranged (≈arranged) so that it can be incident from the tip of the part α. More specifically, the tip of the corner portion α of the prism light receiving portion 10b is disposed so as to face the pointer light source 9 (L1) at a substantially acute angle (45 ° in this embodiment).

  Here, the corner of the prism light receiving unit 10b is not an acute angle but a substantially acute angle. The reason for this is that even if the corner is designed at an acute angle, the corner at the tip is not an ideal perfect acute angle during actual manufacturing. It is formed in an arc shape. For this reason, a substantially acute angle is formed, and in this embodiment, the arcuate radius R is formed such that R≈0.1 mm.

  In the present embodiment, the substantially acute corner α is formed at 45 °. When the light guide 10 is made of, for example, acrylic resin, the ideal angle (total reflection angle) β for totally reflecting light is set to β = 42.9 °. (Α = β) is ideal. However, in actuality, taking into consideration the ideal angle, the installation position of the pointer light source 9 (L1), the first reflecting surface 10c and the second reflecting surface 10d being formed in parallel, the pointer light receiving surface 4a (particularly, 4a), the prism light exit surface 10e is arranged in parallel, and other design conditions are taken into consideration. Therefore, here, a corner portion α = 45 °, which is a substantially acute angle in design, is adopted. ing. As described above, the corner portion α of the prism light receiving unit 10b is designed based on an ideal angle that totally reflects light. However, in consideration of the various conditions, the corner portion α is approximately 40 ° to 50 ° at the time of design. These values are adopted.

  In addition, a method of obtaining the highest luminance with the pointer light source 9 (L1) is a method of directly confirming a position with high luminance using a luminance measuring device in advance, or, in general, with a point light source (LED), the center of the light source is around the light source. For example, there is a method in which the central portion of the pointer light source 9 (L1) is regarded as the position with the highest luminance.

  Then, as shown in FIG. 4, the irradiation light incident from the tip of the corner α of the prism light-receiving unit 10 b is seen from the cross-section of the light guide 10, the first reflecting surface 10 c serving as the upper base of the trapezoidal shape, and the lower base The second reflecting surface 10d is reflected and collected almost in the form of a bundle, and is emitted from the prism light emitting surface 10e (the solid line L1a indicates the flow of light). The irradiation light L1a emitted as a bundle of light is configured to be incident on 4aa of the pointer light receiving surface 4a.

  In FIG. 4, for example, as indicated by the flow of light of the broken line L1b, when the light from the pointer light source 9 (L1) is irradiated in the prism light receiving unit 10b other than the tip of the substantially acute corner portion α, Light that is reflected off the surface of the second reflecting surface 10d and goes out of the light guide, or is emitted from the prism light exit surface 10e via internal reflection of the light guide 10, but is incident on 4aa of the pointer light receiving surface 4a. There are things that do not. However, even if there is light that exits from the prism light exit surface 10e and cannot enter 4aa, for example, as shown in FIG. 3, 4ab of the pointer light-receiving surface 4a can receive light.

  As described above, in the present embodiment, light from the light source is incident from the tip of the corner α of the prism light receiving unit 10b, and the incident light is emitted from the prism light exit surface 10e in a nearly bundled state. Light can be intensively incident on the pointer light receiving surface 4aa. In other words, the light from the pointer light source 9 can be condensed so as to be as close as possible to the drive shaft 3 side, and the condensed light can be guided to the pointer light receiving surface 4aa of the instruction section 4b. Therefore, even when it is desired to reduce the size of the light-shielding cap 12 in order to improve the appearance of the design (= the structure of the pointer light receiving surface 4a of the indication portion 4b of the pointer 4 is desired to be smaller), the illumination of the indication portion 4b of the pointer 4 It is possible to realize a speedometer 1 having a design while suppressing a decrease in luminance.

  In addition, among the pointer light receiving surfaces 4a, as a merit of receiving light at 4aa, 4aa is closer to the prism light emitting surface 10e of the light guide 10 than 4ab, and 4aa is used for other light emitted from the prism light emitting surface 10e. It can be incident efficiently without leaking. Therefore, even if the design is such that the size of the light-shielding cap 12 is hardly reduced, the embodiment in which the incident light is incident at 4aa from the viewpoint of being excellent in the molding process and suppressing the decrease in the illumination brightness of the instruction portion 4b of the pointer 4. The configuration of is effective.

  Further, the tip of the corner portion α of the prism light receiving unit 10b is arranged to be opposed to the central portion having the highest luminance of the pointer light source 9 (L1) which is a point light source, so that the light from the light source is efficiently guided. It can be incident on the body 10, and consequently, a decrease in illumination brightness of the instruction portion 4 b of the pointer 4 can be suppressed.

  Further, the reflection surface inside the light guide 10 includes a first reflection surface 10c on which light incident on the light guide 10 from the prism light receiving unit 10b is first reflected, and light reflected by the first reflection surface 10c. Since the second reflection surface 10d for emitting light from the prism light exit surface 10e is provided, light passing through the light guide 10 can be emitted with a small number of reflections (two times). It is possible to reduce loss due to reflection (decrease in light guide efficiency).

  As mentioned above, although embodiment in the light emission pointer meter of this invention was described, this invention is not limited to embodiment mentioned above, This invention deviates from the summary of the invention which concerns on each claim of a claim The present invention is applicable not only to the automobile speedometer described in the embodiment, but also to a tachometer, etc., and is not limited to the automobile field, and can also be applied to pointer instruments such as for aviation and ships.

  In another embodiment, for example, the prism light receiving unit 10b (the tip of the corner) is disposed so as to be substantially in contact with the center of the light source so that light at the center of a point light source such as an LED can enter.

  In the case of a point light source such as an LED, although depending on the lens provided on the element, generally the light from the light source diffuses to the surroundings as the distance from the light source increases. Therefore, in the present invention that must be incident at the tip of a substantially acute corner of the prism light receiving unit 10b, the point light source increases as the distance between the pointer light source 9 (L1 to L4) and the prism light receiving unit 10b of the light guide 10 increases. The light is diffused and the light receiving efficiency is lowered. Therefore, in order to enable light reception in the state of the peak light before the light of the point light source is diffused, the pointer light sources 9 (L1 to L4) and the prism light receiving unit 10b are arranged adjacent to each other so as to be in contact with each other. Thus, it becomes effective especially for the light reception efficiency improvement of the light guide 10 by enabling it to light-receive in a peak light state.

  In another embodiment, only the tip portion of the corner of the light receiving portion 10b of the light guide 10 may be intentionally formed in a curved shape as long as the effect of the present invention is not lost. By making only the tip of the acute angle portion a curved surface in this way, a margin for misalignment with the light source 9 for the pointer can be secured when the light guide 10 is installed at the time of manufacture, so that it can be installed quickly. Become. Therefore, it is possible to reduce the temporal manufacturing cost while improving the light collection efficiency.

  Further, in the present embodiment, the pointer light receiving surface 4a for guiding the inside of the bearing of the pointer 4 is formed by the surface 4aa close to the light guide 10 and the far surface 4ab. It may be formed only by the surface 4aa.

  In this embodiment, the pointer light source 9 uses four LEDs (L1 to L4). However, the present invention is not limited to this, and the number may be larger or one.

  Moreover, although this embodiment demonstrated using the light shielding cap 12, it is not restricted to this, For example, you may light-shield with a shape thing like the seal | blocker which shields light instead of a cap.

1 Speedometer (equivalent to the emission indicator instrument of the present invention)
2 Drive bearing 3 Drive shaft 4 Pointer (equivalent to the pointer of the present invention)
4a Pointer light receiving surface (corresponding to the light receiving surface of the present invention) 4aa, 4ab
4b indicating unit (corresponding to the indicating unit of the present invention)
4c Pointer reflecting surface 5 Driving device 6 Circuit board 7 Cylindrical body 8 Dial 8a Scale area 9 Pointer light sources (L1 to L4) (corresponding to the light source of the present invention)
10 Light guide (corresponding to the light guide of the present invention)
10a prism base 10b prism light receiving part (corresponding to the light receiving part of the present invention)
10c 1st reflective surface (equivalent to the reflective surface of this invention)
10d 2nd reflective surface (equivalent to the reflective surface of this invention)
10e Prism light exit surface (corresponding to the light exit surface of the present invention)
11 Light source for dial 12 Light shielding cap (corresponding to the light shielding part of the present invention)

Claims (6)

A pointer connected to the drive shaft and having a translucent indicator;
A light source disposed around a drive bearing of the drive shaft of the pointer and illuminating the pointer;
A light guide provided between the light source and the pointer,
The pointer is a surface substantially perpendicular to the axis of the drive shaft, and a light receiving surface for guiding the light emitted from the light source to the indicator is formed.
The light source is disposed at a position where at least a part of the light source deviates from a position facing the light receiving surface and at a predetermined distance with respect to the drive bearing,
The light guide is
A light receiving portion that is disposed to face the light source, and that is incident from the tip of a corner portion formed at a substantially acute angle with light emitted from the light source;
A reflecting surface for reflecting light incident from the light receiving unit;
A light exit surface that emits light reflected by the reflective surface toward the light receiving surface of the pointer;
A luminescent indicator instrument characterized by comprising:   The light emission indicator instrument according to claim 1, wherein the light source is a point light source, and the light receiving unit is disposed to be opposed to the center of the point light source.   The light-emitting pointer instrument according to claim 2, wherein the light-receiving unit is disposed so as to be substantially in contact with the center of the point light source so that light at the center of the point light source can enter. The reflective surface of the light guide is
A first reflecting surface on which light incident on the light guide from the light receiving portion is first reflected;
A second reflecting surface is provided which is formed in parallel with the first reflecting surface and can emit light reflected by the first reflecting surface from the light emitting surface. Item 4. The light emission indicator meter according to any one of Items 1 to 3. When it is assumed that a vertical line is drawn in the direction of the pointer with respect to the light source, the light receiving unit and one end of the first reflecting surface are arranged on the vertical line so as to be in contact with each other,
5. The light emitting pointer instrument according to claim 4, wherein the corner portion of the light receiving portion formed at the substantially acute angle is formed based on an angle at which the first reflecting surface can totally reflect light. A pointer reflecting surface that reflects light incident from the light receiving surface in the direction of the pointing unit;
6. The light guide unit according to claim 1, further comprising a light shielding portion that is provided so as to cover a viewing side of the pointer reflecting surface and shields light incident on the light receiving surface so as not to be directly exposed to the viewing side. The light emission indicator instrument according to claim 1.

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