JP2009058475A - Pointer meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pointer meter that can enhance the luminance of a pointer part formed on a pointer plate, even if the pointer plate is formed thin that should reduce the inertial moment of the pointer plate. <P>SOLUTION: A speedometer 2 is equipped with a first dial 10 formed with figure parts 12; a second dial 20 formed with graduation parts 21; a pointer plate 30 formed with a pointer part 50; a movement 70 for rotationally driving the pointer plate 30; and a light-emitting diode 92 that irradiates light from the center part of the pointer plate 30 toward a reflecting interface 37 of an outer peripheral part. The pointer part 50 has formed first and second reflecting surfaces 51, 52. The reflecting interface 37 is formed so that the reflected light travels toward the first and second reflecting surfaces 51, 52. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pointer instrument.

Conventionally, it is a pointer board made of a transparent light guide member, formed in a substantially disc shape, and having a pointer part pointing to a display part formed on a dial on an axial end face, and the pointer part advances inside the pointer board There is known a pointer instrument having a pointer board made of a reflective surface that reflects light toward the viewer side, and a light source that emits light from the center of the pointer board toward the outer periphery of the pointer board (Patent Literature). 1). In this pointer instrument, the light emitted from the light source is reflected by the outer peripheral portion of the pointer board, and the reflected light is incident on the reflecting surface, thereby allowing the viewer to recognize the pointer portion as a single light streak. . The pointer board is rotationally driven by a movement comprising a motor or the like provided behind the dial.
JP 2006-267081 A

  In the above-described pointer instrument, since the pointer portion is formed on the pointer plate formed in a substantially disc shape, the moment of inertia is larger than that of the needle-shaped pointer portion, and the burden on the movement increases. For this reason, it is necessary to make the pointer board thin in order to reduce the moment of inertia of the pointer board. However, when the pointer board is made thinner, the amount of light supplied from the light source to the pointer board decreases.

  In the above-described pointer instrument, the outer peripheral portion of the pointer board has a smooth shape with almost no step. For this reason, most of the light emitted from the central part of the pointer board toward the outer peripheral part is reflected by the outer peripheral part and returns to the central part again. The light irregularly reflected at the outer peripheral portion reaches the reflecting surface of the pointer portion, and the reflecting surface emits light.

  Since the direction component of irregular reflection is irregular, the amount of light reaching the reflecting surface is small. In addition, if the pointer board is made thin in order to reduce the moment of inertia, the amount of light incident on the pointer board is reduced, so that the amount of light reaching the reflecting surface is further reduced and the brightness of the pointer part is reduced. A problem occurs.

  An object of the present invention is to provide a pointer instrument that can increase the brightness of the pointer portion formed on the pointer board even if the pointer board is formed thin so as to reduce the moment of inertia of the pointer board.

  The invention according to claim 1 of the present invention is made of a dial having a display portion formed thereon and a transparent light guide material for guiding light, and is formed in a substantially disk shape, and points to the display portion on an axial end face. A reflection board formed with an inclination with respect to the axial end face so as to reflect light in the direction along the axial end face traveling inside the pointer board to the viewer side, the pointer board having the pointer part A pointer instrument comprising: a pointer board comprising a surface; and a light source that irradiates light toward a reflective interface provided on an outer peripheral part of the pointer board from a central part of the pointer board, wherein the reflective interface is a reflective interface It is characterized in that the reflected light reflected by the light travels through the pointer board toward the reflecting surface.

  According to this configuration, the pointer portion formed on the pointer plate formed in a substantially disc shape has an axial end surface that reflects light in a direction along the axial end surface traveling inside the pointer plate to the viewer side. It consists of a reflective surface that is inclined with respect to. And since the reflective surface reflects the light reflected by the reflective interface provided in the outer peripheral part of the pointer board to the viewer side, it does not make the viewer recognize the pointer portion as an object, but one pointer portion. It can be recognized as a streak of light, and the pointer part can have a novel appearance.

  In addition, the reflection interface that supplies light to the reflection surface is formed so that the reflected light reflected by the reflection interface travels in the pointer board toward the reflection surface. The number of times the light is reflected at the reflection interface before reaching the second reflecting surface can be reduced as much as possible, and the distance traveled by the light can be shortened as much as possible. As a result, the light traveling inside the pointer board can be efficiently guided to the reflecting surface, and the brightness of the pointer portion can be increased.

According to a second aspect of the present invention, the pointer portion passes through the central axis of the pointer board, and a virtual dividing line that divides the pointer board into a semicircular first region and a semicircular second region is provided. When the dividing line is set as a reference direction, it is formed from the center part of the pointer board toward the outer peripheral part, and the reflecting surface of the pointer part is the outer periphery on the first region side with the dividing line as a boundary. A first reflecting surface inclined with respect to the axial end surface so as to face the portion, and a second reflecting surface inclined with respect to the axial end surface so as to face the outer peripheral portion on the second region side,
A plurality of reflective interfaces are formed over the entire circumference of the outer periphery of the pointer board. The reflective interface on the first region side reflects the reflected light reflected by the reflective interface on the first region side toward the first reflective surface. The reflective interface on the second region side is formed such that the reflected light reflected by the reflective interface on the second region side travels toward the second reflective surface. It is said.

  According to this configuration, the reflective interface on the first region side is formed such that the reflected light reflected by the reflective interface on the first region side travels toward the first reflecting surface, and the reflective surface on the second region side The interface is formed so that the reflected light reflected by the reflective interface on the second region side travels toward the second reflecting surface, so that it reaches the first and second reflecting surfaces from the center of the pointer board. By doing so, the number of times the light is reflected at the reflection interface can be reduced as much as possible, and the distance traveled by the light can be shortened as much as possible. For this reason, the light traveling inside the pointer board can be efficiently guided to the first and second reflecting surfaces, and the brightness of the pointer portion can be increased.

  Further, the light traveling in the first area of the pointer board at the dividing line is supplied to the first reflecting surface, and the light traveling in the second area of the pointer board in the second area is supplied to the second reflecting surface. Therefore, the brightness of the first and second reflecting surfaces can be made uniform.

  Specifically, as described in claim 3, a plurality of reflective interfaces are formed at a predetermined pitch angle over the entire circumference of the outer peripheral portion of the pointer board, and the reflective interface on the first region side is further formed. Is inclined so that the reflected light reflected by the reflective interface on the first region side is directed toward the first reflective surface with respect to the tangent line of the virtual circle passing through the reflective interface, and the reflective interface on the second region side is Since the reflected light reflected by the reflective interface on the second region side is inclined toward the second reflective surface with respect to the tangent to the circle, each reflected by the reflective interface on the first and second regions side Can be efficiently guided to the first and second reflecting surfaces.

  The invention described in claim 4 of the present invention is characterized in that the reflection interface is formed symmetrically with respect to the dividing line. According to this configuration, since the progress of light in the first and second regions is substantially the same, the luminance of the first and second reflecting surfaces can be made uniform.

  The invention according to claim 5 of the present invention is characterized in that a highly reflective member covering the reflective interface is provided on the outer periphery of the reflective interface. According to this configuration, it is possible to suppress light from being transmitted from the reflection interface and escaping to the outer peripheral side, so that the brightness of the pointer portion can be further increased.

In the invention according to claim 6 of the present invention, the pointer portion passes through the central axis of the pointer board, and is on a virtual dividing line that divides the pointer board into a semicircular first region and a semicircular second region. , Formed extending from the center part of the pointer board toward the outer peripheral part, the reflecting surface of the pointer part is inclined to face the outer peripheral part on the first region side,
A plurality of reflective interfaces are formed over the entire circumference of the outer periphery of the pointer board, and the reflected light reflected by the reflective interface on the first region side travels toward the reflective surface on the first region side. The reflective interface on the second region side is formed by the reflected light reflected by the reflective interface on the second region side, and the central portion of the pointer board on the side where the pointer portion is not formed in the dividing line. It is characterized by being formed so as to proceed toward the first region through a line connecting the outer peripheral portion.

  According to this configuration, the reflective interface on the first region side is formed such that the reflected light reflected by the reflective interface on the first region side proceeds toward the reflective surface, and the reflective interface on the second region side is The reflected light reflected by the reflective interface on the second region side passes through a line connecting the central portion and the outer peripheral portion of the pointer board on the side where the pointer portion is not formed among the dividing lines, and enters the first region. Since the light on the first area side, as well as the light on the second area side, wraps around the first area and reaches the reflecting surface, it radiates from the center of the pointer board. The irradiated light can be efficiently guided to the reflecting surface, and the brightness of the pointer portion can be increased.

  According to the seventh aspect of the present invention, the reflective interface is formed at a predetermined pitch angle over the entire outer periphery of the pointer board, and the reflective interface on the first region side is a virtual circle passing through the reflective interface. With respect to the tangent line, the reflected light reflected by the reflection interface on the first region side is inclined so as to go to the first reflection surface, and the reflection interface on the second region side is Reflected light reflected at the reflective interface on the region side travels toward the first region through a line connecting the central portion and the outer peripheral portion of the pointer board on the side where the pointer portion is not formed among the dividing lines. It is characterized by sloping.

  Specifically, as described in claim 7, a plurality of reflective interfaces are formed at a predetermined pitch angle over the entire circumference of the outer peripheral portion of the pointer board, and the reflective interface on the first region side is further formed. Is inclined so that the reflected light reflected by the reflective interface on the first region side is directed toward the reflective surface with respect to the tangent of the virtual circle passing through the reflective interface, and the reflective interface on the second region side is tangent to the virtual circle On the other hand, the reflected light reflected by the reflective interface on the second region side passes through a line connecting the central portion and the outer peripheral portion of the pointer board on the side where the pointer portion is not formed among the dividing lines, Since it inclines so that it may progress toward 1 area | region, each reflected light reflected in the reflective interface of the 1st, 2nd area | region side can be efficiently guide | induced to a reflective surface.

  The invention according to claim 8 of the present invention is characterized in that a highly reflective member covering the reflective interface is provided on the outer periphery of the reflective interface. According to this configuration, it is possible to suppress light from being transmitted from the reflection interface and escaping to the outer peripheral side, so that the brightness of the pointer portion can be further increased.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
FIG. 1 is a front view of a speedometer as a pointer instrument according to a first embodiment of the present invention incorporated in a combination meter. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The combination meter 1 is arranged in an instrument panel provided in front of a driver's seat in a passenger compartment of an automobile, and displays various information on the vehicle. As shown in FIG. 1, the combination meter 1 has a speedometer 2 that displays the traveling speed of the automobile.

  The speedometer 2 includes an annular ring portion 11 that forms the outer shape of the meter. On the inner peripheral side of the ring part 11, a numerical part 12 representing a traveling speed is provided, and on the further inner peripheral side of the numerical part 12, a scale part 21 is provided. As shown in FIG. 1, the numeral portion 12 and the scale portion 21 are arranged on a concentric circle with the center of the ring portion 11 as the center. The number part 12 and the scale part 21 are equivalent to the display part as described in a claim.

  On the further inner peripheral side of the scale part 21, a pointer part 50 indicating the numeral part 12 and the scale part 21 is provided. The pointer portion 50 has the center of the ring portion 11 as a rotation center, and extends in the radial direction from the rotation center.

  The speedometer 2 displays the traveling speed of the automobile by pointing the numeral section 12 or the scale section 21 corresponding to the traveling speed when the pointer section 50 rotates by a predetermined angle according to the traveling speed of the automobile.

  Next, the structure of the speedometer 2 will be described in detail with reference to FIGS. The speedometer 2 rotates the first dial 10 on which the numeral part 12 is formed, the second dial 20 on which the scale part 21 is formed, the pointer board 30 on which the pointer part 50 is formed, and the pointer board 30. A movement 70 to be driven is provided, and these are accommodated in a case 80 and a facing plate 81.

  The first dial 10 is arranged on the viewer side (upper side in FIG. 2), and the second dial 20 is arranged behind it. The first dial 10 and the second dial 20 are supported by a diffusion plate 83 disposed behind the second dial 20 and fixed to the case 80. The pointer board 30 is disposed between the first dial 10 and the second dial 20, and the movement 70 is disposed behind the diffusion board 83.

  The first dial 10 is formed in a substantially annular shape from a light-transmitting material such as a colorless and transparent polycarbonate resin or acrylic resin. As shown in FIGS. 1 and 2, the first dial 10 includes an opening 13 at the center and a ring 11 at the outer periphery.

  Between the ring part 11 and the opening part 13, the above-described numeral part 12 is formed (see FIG. 1). The number portion 12 is formed on the surface of the first dial 10 and is formed by providing an opaque coloring layer that blocks light in a portion other than the portion that becomes the number portion 12. This opaque color layer is composed of, for example, opaque black ink. By irradiating light from behind the first dial 10, the number portion 12 is lit and displayed.

  The second dial 20 is formed in a substantially disc shape from a light transmissive material, for example, a colorless and transparent polycarbonate resin or acrylic resin. As shown in FIG. 2, the diameter of the second dial 20 is slightly larger than the inner diameter of the opening 13. A through hole 22 is formed at the center of the second dial 20.

  The scale part 21 mentioned above is formed between the outer peripheral part of the 2nd dial 20 and the through-hole 22 (refer FIG. 1). The scale portion 21 is formed on the surface of the second dial 20 and is formed by providing an opaque coloring layer that blocks light in a portion other than the portion that becomes the scale portion 21. This opaque color layer is composed of, for example, opaque black ink. By irradiating light from behind the second dial plate 20, the scale portion 21 is lit and displayed.

  A circuit board 90 is disposed behind the diffusion plate 83. The circuit board 90 is also fixed to the case 80. A light emitting diode 91 that irradiates light toward the number part 12 and the scale part 21 is mounted on the surface of the circuit board 90 on the diffusion plate 83 side.

  The light emitted from the light emitting diode 91 is supplied to the number part 12 and the scale part 21 via the diffusion plate 83. The diffusion plate 83 is made of a milky white resin material, and uniformly supplies the light emitted from the light emitting diode 91 to the number portion 12 and the scale portion 21.

  A movement 70 is mounted on the surface of the circuit board 90 opposite to the diffusion plate 83. The movement 70 is composed of an electric actuator such as a stepping motor or a cross coil type rotating machine, and rotates the shaft 71 by an angle corresponding to an external electric signal (in the case of the speedometer 2, a vehicle traveling speed signal). It is. As shown in FIG. 2, a pointer board 30 disposed between the first dial 10 and the second dial 20 is attached to the tip of the movement 70.

  The pointer board 30 includes a disk part 31 and a cap part 40. The disk part 31 is comprised from COP (cycloolefin polymer), and is formed in the substantially disk shape. In the central part of the disk part 31, an incident part 34 that extends in a direction penetrating the through hole 22 of the second dial 20 and receives light is formed. A reflecting portion 35 that irradiates the light incident from the incident portion 34 toward the outer peripheral portion of the disc portion 31 is formed at the center portion of the disc portion 31. Thereby, the light incident from the incident part 34 is reflected by the reflecting part 35 and the light travels inside the disk part 31 toward the outer peripheral part.

  Between the central portion and the outer peripheral portion of the disk portion 31, a pointer portion 50 is formed so as to extend from the central portion toward the outer peripheral portion (see FIGS. 1 and 2). As shown in FIG. 2, the pointer portion 50 is formed on the axial end surface 33 on the second dial 20 side. As shown in FIG. 3, the pointer portion 50 includes two surfaces that are inclined with respect to the axial end surface 33. These two surfaces are inclined so that the space between the surfaces expands toward the axial end surface 33. One of the two surfaces is referred to as a first reflecting surface 51, and the other surface is referred to as a second reflecting surface 52. The first and second reflecting surfaces 51 and 52 are formed by forming grooves having a triangular cross section in the axial end surface 33.

  As shown in FIG. 3, the first and second reflecting surfaces 51 and 52 are inclined toward the viewer side (upper side in FIG. 3), and therefore reflect light traveling inside the disk portion 31, The reflected light is emitted to the viewer side. This allows the viewer to recognize the pointer portion 50 as a single light streak. The configuration of the disk part 31 will be described in detail later.

  The cap part 40 is comprised from POM (polyacetal), and is arrange | positioned so that the incident part 34 and the reflection part 35 of the disk part 31 may be covered. As shown in FIG. 2, the cap portion 40 has a boss portion 41 protruding in the direction of the second dial 20 at the center portion, and is press-fitted into the shaft 71. The cap portion 40 has a protruding portion 42 on the outside of the boss portion 41. After inserting the boss part 41 into the hole 36 provided in the disk part 31, the disk part 31 and the cap part 40 are fixed by applying heat caulking to the tip of the protruding part 42.

  A light emitting diode 92 that irradiates light to the incident portion 34 of the disk portion 31 is mounted on the circuit board 90. A plurality of light emitting diodes 92 are mounted around the shaft 71. A prism 93 for condensing the light emitted from the light emitting diode 92 on the incident portion 34 is provided between the light emitting diode 92 and the incident portion 34. A light shielding member 94 is provided around the light emitting diode 92. The light emitting diode 92 corresponds to the light source described in the claims.

  Next, the pointer board 30 will be described in detail with reference to FIGS. 4 and 5. 4 is a plan view of the pointer board 30 when viewed from the IV direction in FIG. FIG. 5 is an enlarged view of a portion surrounded by a broken line in FIG.

  The disk part 31 is composed of a substantially disk-shaped main body part 32 having an incident part 34 and a reflection part 35, and a cover part 39 that covers the outer peripheral part of the main body part 32. In this embodiment, the diameter of the disk part 31 is 80 mm. The thickness of the disk portion 31 decreases toward the outer peripheral portion. In the vicinity of the reflection part 35 of the disk part 31, it is 1.0 mm, and in the outer peripheral part of the disk part 31, it is 0.4 mm.

  As described above, the disk part 31 uses COP having a lighter specific gravity than polycarbonate resin or acrylic resin. And the disc part 31 is formed so that thickness may become thin, so that it goes to an outer peripheral part. For this reason, the moment of inertia of the disk part 31 can be made as small as possible. Moreover, since the center part of the disk part 31 is thick compared with an outer peripheral part, the intensity | strength of the disk part 31 can also be ensured.

  As shown in FIG. 4, the main body portion 32 has a reflection interface 37 that reflects light emitted from the reflection portion 35 on the outer peripheral portion. The reflection interface 37 is a surface formed in plural around the outer peripheral portion of the main body 32 and reflects light from the reflection portion 35. The reflective interface 37 reflects the light incident from the reflective portion 35 and guides it to the first and second reflective surfaces 51 and 52 of the pointer portion 50 as shown in FIG.

  As shown in FIG. 5, the reflection interface 37 is formed to be inclined at an angle θ with respect to a tangent 62 (two-dot chain line) of a virtual circle 61 (one-dot chain line) passing through the reflection interface 37. The direction in which the reflection interface 37 is inclined is such that the reflected light reflected from the reflection part 35 is directed toward the first reflection surface 51 and the second reflection surface 52 of the pointer part 50. Specifically, the direction in which the reflective interface 37 is inclined is divided into an upper half area (referred to as a first area 63) of the dividing line 60 indicated by a one-dot chain line passing through the center of the main body 32 shown in FIG. It differs in a half area (referred to as the second area 64). As shown in FIG. 4, the pointer portion 50 is formed on the dividing line 60, and the first reflecting surface 51 formed on the pointer portion 50 is formed toward the outer peripheral portion on the first region 63 side, and second The reflection surface 52 is formed toward the outer peripheral portion on the second region 64 side.

  The reflective interface 37 on the first region 63 side is formed by rotating the angle θ clockwise with respect to the tangent 62 of the virtual circle 61 (see FIGS. 4 and 5). FIG. 5 shows the reflective interface 37 on the first region 63 side. The reflective interface 37 on the second region 64 side is formed by rotating the angle θ counterclockwise, as opposed to the reflective interface 37 on the first region 63 side (see FIG. 4).

  According to this configuration, as illustrated by an arrow in FIG. 4, among the light emitted radially from the reflecting portion 35 of the main body portion 32 toward the outer peripheral portion, the light on the first region 63 side is The light is reflected by the reflective interface 37 on the first region 63 side and guided to the first reflecting surface 51 of the pointer portion 50 (see the arrow shown in FIG. 4). On the other hand, the light on the second region 64 side is reflected by the reflection interface 37 on the second region 64 side and guided to the second reflecting surface 62 of the pointer portion 50 (see the arrow shown in FIG. 4).

  Thereby, the frequency | count of reflection in the reflective interface 37 can be decreased as much as possible. Therefore, the loss of light when the light is reflected at the reflection interface 37 can be reduced as much as possible. In addition, the distance that the light travels from the reflecting portion 35 to the first and second reflecting surfaces 51 and 52 can be shortened as much as possible, and the loss of light can be minimized.

  As a result, the light traveling inside the main body 32 can be efficiently guided to the first and second reflecting surfaces 51 and 52, and the brightness of the pointer 50 can be increased.

  In the present embodiment, the absolute value of the angle θ described above is the same in all the reflective interfaces 37. Further, the reflection interface 37 has a line-target relationship at the dividing line 60. According to this, since the reflection of light at the reflection interface 37 can be made substantially the same in the first and second regions 63 and 64, the amount of light reaching the first and second reflection surfaces 51 and 52 is also almost the same. The same can be done. Therefore, the brightness | luminance of the 1st, 2nd reflective surfaces 51 and 52 can be made substantially the same.

  In the present embodiment, a cover portion 39 that covers the reflective interface 37 is provided outside the reflective interface 37 formed on the outer peripheral portion of the main body portion 32. The cover part 39 is made of the same COP as the main body part 32. A predetermined amount of titanium oxide is mixed in the COP employed in the cover portion 39 to form a white resin material. Thereby, the reflectance of the light in the reflective interface 37 can be raised. The cover 39 corresponds to the highly reflective member described in the claims.

  Thereby, since the light from the reflection part 35 of the main body part 32 is transmitted without being reflected by the reflection interface 37 and can be prevented from escaping to the outer peripheral side, the brightness of the pointer part 50 is further increased. be able to.

  Next, the structure near the reflective interface 37 will be described in more detail with reference to FIG. As shown in FIG. 5, a plurality of reflection interfaces 37 are formed at a predetermined pitch angle θp. In the present embodiment, the pitch angle θp is 4.3 °.

  A stepped surface 38 is formed between the adjacent reflective interfaces 37 to connect the end of one reflective interface 37 and the end of the other adjacent reflective interface 37. The step surface 38 is a surface extending radially from the outer peripheral portion of the main body portion 32. The angle between the step surface 38 and the adjacent step surface 38 coincides with the pitch angle θp. In the present embodiment, the length H of the stepped surface 38 is 0.3 mm. Further, the portion h where the thickness in the radial direction of the cover portion 39 provided outside the reflective interface 37 and the stepped surface 38 is the smallest is 0.3 mm.

  In the case of the present embodiment, the dimensions and angles are determined in consideration of the following.

  First, manufacture of the disk part 31 is demonstrated. The disk portion 31 is formed by insert molding in which the main body portion 32 and the cover portion 39 are formed by arranging the main body portion 32 formed in advance by injection molding or the like in a mold for forming the cover portion 39, or in the same die. 32 and cover 39 are formed by two-color molding.

  For this reason, as shown in FIG. 5, an R is formed in manufacturing at a portion where the reflection interface 37 and the stepped surface 38 are connected. For this reason, when light enters the range θd where R is formed, the light cannot be guided in an appropriate direction, that is, in a direction toward the first and second reflecting surfaces 51 and 52. If the pitch angle θp of the reflection interface 37 is too small, the ratio of the θd to the entire circumference of the main body 32 increases, so that the amount of light guided to the first and second reflection surfaces 51 and 52 decreases. On the other hand, if the pitch angle θp is too large, the ratio of θd to the entire circumference of the main body 32 is reduced, but the size of the reflection interface 37 per unit is too large, and the reflected light is appropriately adjusted to the first, It becomes difficult to guide to the second reflecting surfaces 51 and 52.

  As for the length H of the stepped surface 38, if the length H is too long, the reflected light reflected by the reflective interface 37 hits the adjacent stepped surface 38 as shown by the arrow in FIG. , Cannot be guided to the second reflecting surfaces 51 and 52. If it is too small, the angle θ of inclination of the reflective interface 37 with respect to the tangent line 62 becomes small, and it may be difficult to guide reflected light to the first and second reflective surfaces 51 and 52.

  As for the cover part 39, if the h is made too small in order to reduce the moment of inertia of the disk part 31 in order to reduce the burden on the movement 70, the resin material is used when the cover part 39 is insert-molded or two-color molded. However, it becomes difficult to flow between the mold and the reflective interface 37 and the stepped surface 38, and it becomes difficult to form the cover portion 39.

  On the other hand, in the present embodiment, COP is used as the resin material constituting the cover portion 39, as MLR (melt flow rate) is larger than that of polycarbonate resin or acrylic resin. In the present embodiment, in order to achieve the function of the cover portion 39, titanium oxide is mixed into the COP to whiten the material.

  Here, the greater the amount of titanium oxide mixed, the more white the COP, which is a transparent material, so that the light reflectance is improved. However, the greater the amount of titanium oxide mixed, the worse the fluidity in the mold or the mold releasability. For this reason, it becomes difficult to make h small in manufacturing, and this hinders the reduction of the moment of inertia.

  In the present embodiment, in consideration of the above, the reflection interface 37 is formed so that light can be guided to the first and second reflection surfaces 51 and 52 as much as possible.

  Moreover, as a manufacturing method of the disk part 31, it is preferable to employ | adopt 2 color molding. According to the two-color molding, it is possible to mold the cover portion 39 with the same mold without releasing the main body portion 32 as the primary molded product. It becomes difficult to get scratches on the place. For this reason, it can suppress that light reflects in the part with a damage | wound, and the part which is not intended emits light.

  In this embodiment, although the speedometer 2 was demonstrated, it is not restricted to this. Any pointer instrument may be used. For example, it may be used for a pointer portion of an engine tachometer or may be used for a pointer portion of a fuel remaining amount meter.

  In the present embodiment, the pointer portion is set on the dividing line passing through the center of the disk, but if the pointer portion is set from the center side toward the outer peripheral side, the same effect is obtained even if it is not on the dividing line. can get.

(Second Embodiment)
6 and 7 show a second embodiment of the present invention. Here, only parts different from the first embodiment will be described. 6 is a drawing corresponding to FIG. 4 of the first embodiment, and FIG. 7 is a drawing corresponding to FIG. 3 of the first embodiment.

  As shown in FIGS. 6 and 7, the shape of the pointer portion 50a formed on the axial end surface 33a of the disc portion 31a of the pointer plate 30a of the present embodiment is different from that of the pointer portion 50 of the first embodiment. The pointer portion 50a of the present embodiment is formed by only the reflecting surface 51a facing the outer peripheral portion of the disc portion 31a on the first region 63 side divided by the dividing line 60. Thus, when the pointer portion 50a is formed, the reflecting surface 51a reflects only the light on the first region 63 side.

  A reflective interface 37a formed on the outer peripheral portion of the main body 32a of the disk portion 31a is different from the reflective interface 37 of the first embodiment. As shown in FIG. 6, in the present embodiment, both the reflective interface 37 a on the first region 63 side and the reflective interface 37 a on the second region 64 side are at an angle θ clockwise with respect to the tangent 62 of the virtual circle 61. It is formed by rotating.

  By forming the reflection interface 37a in this way, the light on the first region 63 side is reflected by the reflection interface 37a on the first region 63 side and guided to the reflection surface 51a as shown by the arrow in FIG. It is burned. The light on the second region 64 side is reflected by the reflection interface 37a on the second region 64 side as shown by the arrows in FIG. The reflected light enters the first region 63 through a line connecting the central portion and the outer peripheral portion of the pointer board 30a on the side of the dividing line 60 where the pointer portion 50a is not formed. Then, the light is reflected by the reflective interface 37a on the first region 63 side and guided to the reflective surface 51a.

  According to this configuration, even if the pointer portion 50a is of a type in which the reflective surface 51a is only on one side, the light existing on the opposite side of the reflective surface 37a, that is, the light on the second region 64 side is transmitted to the first region. It can be led to the reflecting surface 51a by wrapping around to the 63 side. For this reason, light can be efficiently guided to the reflecting surface 51a inside the pointer board 30a, and the luminance of the pointer portion 50a can be increased.

It is a front view of the speedometer by 1st Embodiment of this invention. It is sectional drawing of the II-II line | wire in FIG. It is sectional drawing of the III-III line | wire in FIG. FIG. 4 is a view in the direction of arrows IV in FIG. 2. FIG. 3 is an enlarged view of a V portion in FIG. 2. It is a top view of the pointer board of the speedometer by 2nd Embodiment of this invention. It is sectional drawing of the VII-VII line in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Combination meter, 2 Speedometer (pointer meter), 10 1st dial (dial), 12 Number part (display part), 20 2nd dial (dial), 21 Scale part (display part), 30 Pointer Disc, 31 disc part, 32 body part, 33 axial end face, 34 incident part, 35 reflecting part, 37 reflecting interface, 38 step surface, 39 cover part, 40 cap part, 50 pointer part, 51 first reflecting surface, 52 Second reflecting surface, 60 dividing line, 61 virtual circle, 62 tangent, 63 first region, 64 second region, 70 movement, 90 circuit board, 92 light emitting diode (light source)

Claims (8)

A dial with a display,
A pointer board that is made of a transparent light guide material that guides light, is formed in a substantially disk shape, and has a pointer part that points to the display part on an axial end face, and the pointer part advances inside the pointer board A pointer board made of a reflective surface formed to be inclined with respect to the axial end surface so as to reflect the light in the direction along the axial end surface to the viewer side;
A light source for irradiating light from a central part of the pointer board toward a reflection interface provided on an outer peripheral part of the pointer board, and a pointer instrument comprising:
The pointer interface is formed so that the reflected light reflected by the reflection interface travels inside the pointer board toward the reflecting surface. The pointer section sets a virtual dividing line that passes through the central axis of the pointer board and divides the pointer board into a semicircular first region and a semicircular second region, and the dividing line is set as a reference direction. When it is, it is formed from the central portion of the pointer board toward the outer peripheral portion,
The reflecting surface of the pointer portion includes a first reflecting surface inclined with respect to the axial end surface so as to face the outer peripheral portion on the first region side with the dividing line as a boundary, and the second region side A second reflecting surface inclined with respect to the axial end surface so as to face the outer peripheral portion;
A plurality of the reflective interfaces are formed over the entire circumference of the outer peripheral portion of the pointer board,
The reflective interface on the first region side is formed such that reflected light reflected by the reflective interface on the first region side travels toward the first reflective surface,
The reflection interface on the second region side is formed so that reflected light reflected by the reflection interface on the second region side travels toward the second reflection surface. Item 1. The pointer instrument according to item 1. A plurality of the reflective interfaces are formed at a predetermined pitch angle over the entire circumference of the outer peripheral portion of the pointer board,
The reflective interface on the first region side is inclined so that reflected light reflected by the reflective interface on the first region side is directed toward the first reflective surface with respect to a tangent line of a virtual circle passing through the reflective interface. And
The reflection interface on the second region side is inclined with respect to the tangent line of the virtual circle so that the reflected light reflected by the reflection interface on the second region side is directed to the second reflection surface. The pointer instrument according to claim 2, wherein:   The pointer instrument according to claim 2 or 3, wherein the reflection interface is formed symmetrically with respect to the dividing line.   The pointer instrument according to any one of claims 1 to 4, wherein a highly reflective member that covers the reflective interface is provided on a further outer periphery of the reflective interface. The pointer portion passes from the central portion of the pointer board on a virtual dividing line that passes through the central axis of the pointer board and divides the pointer board into a semicircular first region and a semicircular second region. Formed to extend toward the outer periphery,
The reflecting surface of the pointer portion is inclined so as to face the outer peripheral portion on the first region side,
A plurality of the reflective interfaces are formed over the entire circumference of the outer peripheral portion of the pointer board,
The reflective interface on the first region side is formed such that the reflected light reflected by the reflective interface on the first region side travels toward the reflective surface,
The reflective interface on the second region side is the reflected light reflected by the reflective interface on the second region side, and the reflected light reflected by the reflective interface on the second region side of the pointer board on the side where the pointer portion is not formed in the dividing line. 2. The pointer instrument according to claim 1, wherein the pointer instrument is formed so as to travel toward the first region through a line connecting a central portion and the outer peripheral portion. The reflective interface is formed at a predetermined pitch angle over the entire circumference of the outer peripheral portion of the pointer board,
The reflection interface on the first region side is arranged such that the reflected light reflected by the reflection interface on the first region side is directed to the first reflection surface with respect to a tangent line of a virtual circle passing through the reflection interface. Tilt,
The reflecting interface on the second region side is formed by reflecting the reflected light reflected by the reflecting interface on the second region side with respect to the tangent line of the virtual circle. The pointer instrument according to claim 6, wherein the pointer instrument is inclined so as to advance toward the first region through a line connecting the central portion and the outer peripheral portion of the pointer board on the non-side. .   The pointer instrument according to claim 6 or 7, wherein a highly reflective member that covers the reflective interface is provided on a further outer periphery of the reflective interface.

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