JP4848861B2 - Pointer instrument and manufacturing method thereof - Google Patents

Description

  The present invention relates to a pointer instrument having a pointer that emits light and a method for manufacturing the pointer instrument.

  Conventionally, a pointer instrument having a pointer that emits light has been adopted as a pointer instrument for a vehicle.

  For example, a pointer instrument is disclosed in which a plurality of light sources having different emission colors are used as pointer light sources, and a dial is transmitted and illuminated by these pointer light sources (see Patent Document 1).

  The pointer instrument includes a light source including a plurality of light sources having different emission colors, a light guide unit, and an adjusting unit that adjusts the light emission luminance of each light source. The light source and the light guide are arranged behind the dial, and the light guide guides the cylindrical part that guides the light emitted from the light source into the pointer and emits the pointer, and guides the light emitted from the light source to the dial. And a plate-like portion for transmitting the dial transparently.

  In this configuration, the light emitted from the light source is mixed color light by adjusting the light emission luminance of each light source by the adjusting means. This mixed color light is guided into the pointer by the cylindrical portion of the light guide unit to emit the pointer with mixed color light, and is guided to the back of the dial by the plate portion of the light guide unit and transmitted through the dial with the mixed color light. Illuminate.

As a result, the color of the mixed color light can be arbitrarily changed by the adjusting means, so that the emission color of the pointer and the color of the transmitted illumination of the dial can be arbitrarily changed. As a result, the pointer capable of novel display. Instrument can be provided.
JP 2001-208573 A

  Although not described in Patent Document 1, since the pointer rotates along the front side of the dial on the viewing side, the luminance of the light emitted from the light source guided into the pointer may vary depending on the rotation position of the pointer. . This variation causes a problem that the light emission luminance of the pointer varies depending on the rotation position of the pointer, and various measures are taken to suppress this variation. For example, the number of light sources is increased, the arrangement thereof is devised, and the shape of the cylindrical portion of the light guide is devised.

  However, these measures have a problem that the manufacturing cost of the pointer instrument increases due to an increase in the number of light sources and a complicated shape of the light guide. In addition, there is a problem that design restrictions arise due to the necessity of increasing the number of light sources, the necessity of elaborating the shape of the light guide unit, and the necessity of elaborating the arrangement of light sources. Also occurs.

  These problems are not limited to the case where the dial is transmissively illuminated by the pointer light source, but is not limited to the case where a plurality of light sources having different emission colors are used as the pointer light source. This is a problem common to a pointer instrument that emits light along a pointer that rotates along.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a pointer instrument including a pointer that emits light and a method for manufacturing the pointer instrument, and to easily suppress fluctuations in light emission luminance of the pointer due to a rotation position.

  In order to achieve the above object, the present invention employs the following technical means.

The pointer instrument according to claim 1 includes a dial having an opening, and a rotary inner unit disposed behind the dial and extending the pointer shaft through the opening from the rear side to the viewing side of the dial. A pointer formed from a translucent resin material and fixed to the tip side of the pointer shaft so as to rotate along the front side of the dial, and a light source disposed behind the dial and emitting the pointer And a light guide portion disposed behind the dial and guiding light emitted from the light source into the pointer, and the light guide portion includes an emitting portion for emitting light emitted from the light source to the pointer through the opening. guidance is provided with a light receiving portion for receiving the light emitted from the emitting portion, light receiving portion and an exit portion and the opening, in the range where the pointer is rotated, Ri heavy Do as viewed in the axial direction of the pointer shaft, the exit portion all of the light receiving portion opening portion that overlaps are overlapped region is formed, the openings Jo is set so as to block partially with dial the light entering directly the light receiving portion from the emission unit, substantially intensity of the light emitted from the emitting portion in the portion that overlaps based on the shape of the opening in the rotational range It is characterized by being set to be constant.

  In this configuration, the shape of the opening is determined so that the luminous intensity of the emitted light from the emitting portion at the portion where the emitting portion, the opening, and the light receiving portion overlap is substantially constant in the rotation range of the pointer. In principle, the luminous intensity at the overlapping part is calculated as the product of the luminance of the emitted light from the emission part at the overlapping part and the area of the overlapping part. Further, the light emission luminance of the pointer is determined by the luminous intensity of the emitted light from the emission portion guided into the pointer.

  As a result, even if the brightness of the emitted light from the emitting portion guided into the pointer varies depending on the rotation position of the pointer, the luminous intensity of the emitted light from the emitting portion guided into the pointer can be made substantially constant. Can be kept substantially constant. That is, fluctuations in the light emission luminance of the pointer due to the rotation position can be easily suppressed by a simple configuration of the shape of the opening.

  The pointer instrument according to claim 2 calculates the luminance of the emitted light from the emitting portion in the overlapping portion by simulation calculation, and calculates the luminous intensity in the overlapping portion as a product of the calculated value and the area of the overlapping portion. It is characterized by that.

  Even with this configuration, the above-described effects can be obtained.

  The pointer instrument according to claim 3 measures the luminance of the emitted light from the emitting portion in the overlapping portion by the luminance measuring means, and calculates the luminous intensity in the overlapping portion as a product of the measured value and the area of the overlapping portion. It is characterized by being.

  Even with this configuration, the above-described effects can be obtained.

The method for manufacturing a pointer instrument according to claim 4 includes a dial having an opening, and a rotation that is disposed behind the dial and extends from the rear side to the viewing side of the dial through the opening through the opening. An inner unit, a pointer formed of a translucent resin material and fixed to the tip side of the pointer shaft so as to rotate along the front side of the dial, and a pointer disposed behind the dial and A light source that emits light and a light guide that is disposed behind the dial and guides light emitted from the light source into the pointer, and the light guide emits light emitted from the light source to the pointer through the opening. site includes a section, guidance is provided with a light receiving portion for receiving the light emitted from the emitting portion, the exit portion and the opening portion and a light receiving portion, in a range where the pointer is rotated, overlapping when viewed in the axial direction of the pointer shaft a constructed indicating instrument manufacturing method to form a portion that overlaps A first step for obtaining the luminance of the emitted light from the emitting portion and a second step for calculating the luminous intensity of the emitted light from the emitting portion at the overlapping portion as a product of the luminance obtained in the first step and the area of the overlapping portion. And a third step of determining the shape of the opening so that the luminous intensity calculated in the second step is substantially constant in the rotation range.

  In this manufacturing method, the luminance of the emitted light from the emitting portion in the portion where the emitting portion, the opening portion, and the light receiving portion overlap is obtained in the first step, and the luminous intensity of the emitted light from the emitting portion in the overlapping portion is determined in the first step. As a product of the brightness obtained in step 2 and the area of the overlapping portion, the second step calculates the shape of the opening. In the third step, the luminous intensity calculated in the second step is substantially constant in the rotation range of the pointer. decide.

  As a result, even if the brightness of the emitted light from the emitting portion guided into the pointer varies depending on the rotation position of the pointer, the luminous intensity of the emitted light from the emitting portion guided into the pointer becomes substantially constant. The emission luminance of is kept substantially constant. That is, the variation in the light emission luminance of the pointer due to the rotation position can be easily suppressed by a simple method of determining the shape of the opening.

  Hereinafter, a case where the pointer instrument according to the present invention is applied to a combination meter mounted on an automobile will be described with reference to the drawings.

(Constitution)
FIG. 1 is a partial front view of a combination meter 1 which is a pointer meter according to an embodiment of the present invention.

  2 is a cross-sectional view taken along line II-II in FIG.

  3A is an enlarged view of the IIIA portion in FIG. 2, and FIG. 3B is an enlarged view of the IIIB portion with the pointer 3 removed in FIG.

  FIG. 4A is a schematic diagram for explaining the relationship between the portion where the emitting portion 61, the opening 23, and the light receiving portion 31 overlap with each other and the rotational position of the pointer 3 shown in FIG. ) Is a schematic graph for explaining the relationship between the brightness of the emitted light from the emitting portion 61 in the overlapping portion, the area of the overlapping portion, and the rotation position of the pointer 3. FIG.

  FIG. 5 is a circuit configuration diagram illustrating an electric circuit of the combination meter 1 according to one embodiment of the present invention.

  The combination meter 1 which is a pointer instrument is arranged in front of the driver's seat of the automobile and displays various vehicle information related to the automobile. As shown in FIG. 1, the combination meter 1 according to the present embodiment forms a speedometer that indicates the traveling speed of an automobile.

  The combination meter 1 includes a dial 2 for displaying information and causing the driver to visually recognize the information. The dial 2 is formed of a translucent material, for example, a plate material such as a transparent polycarbonate resin, and is provided with letters (including numerals) 21 and a scale 22 as a speedometer.

  The background portion of the dial 2 is matte so that the character 21 and the scale 22 are in a white light-transmitting state, for example, blue light-impermeable, for example, on the viewing side surface (the upper surface in FIG. 2). It is formed by printing or hot stamping so as to be in a state (or a state where the translucency of the matte is low).

  Behind the dial 2 (lower side in FIG. 2), a movement 4 that is a rotating inner unit, two light-emitting diodes 5 that are light sources (FIG. 3B), a light guide 6, a case 7, and A printed circuit board 8 constituting the electric circuit section of the combination meter 1 is disposed. The movement 4, the light-emitting diode 5, and a control device 9 (FIG. 5) that drives the movement 4 and turns on and off the light-emitting diode 5 are mounted on the printed circuit board 8. The control device 9 is composed of, for example, a microcomputer.

  The movement 4 is composed of, for example, a cross coil movement or a stepping motor, and rotates the shaft 41 that is a pointer shaft by an angle corresponding to an external electric signal (a vehicle speed signal in the combination meter 1 according to the present embodiment). It is something to be made.

  An opening 23 is provided at substantially the center of the dial 2, and the shaft 41 opens from the movement 4 on the back side (lower side in FIG. 2) of the dial 2 to the viewing side (upper side in FIG. 2). It extends through part 23. The pointer 3 is fixed to the distal end side of the shaft 41, and the movement 4 rotates the shaft 41, thereby rotating the pointer 3 along the front side of the dial 2 on the viewing side (the upper surface in FIG. 2).

  The light guide unit 6 is formed of a translucent resin material such as a transparent acrylic resin, and is configured to be supported and fixed by the case 7. The light guide unit 6 guides the light emitted from the light emitting diode 5 into the pointer 3 to emit the pointer 3, and transmits the light emitted from the light emitting diode 5 to the back side of the dial 2 (the lower surface in FIG. 2). The dial 2 is transmitted and illuminated.

  As shown in FIG. 3, the light guide 6 includes a cylindrical portion 62 formed in a cylindrical shape so as to cover the shaft 41, and a surface on the viewing side of the cylindrical portion 62 (upper surface in FIG. 3A). The light emitting diode 61 emits light emitted from the light-emitting diode 5 to the pointer 3 through the opening 23.

  Here, the range in which the pointer 3 rotates is the rotation position where the pointer 3 points to the scale 22 corresponding to “0” of the character 21 and the rotation where the pointer 3 points to the scale 22 corresponding to “240” of the character 21. The range between positions.

In this rotation range, the luminance (candela / square meter (cd / m ² )) of the light emitted from the emission unit 61 varies depending on the rotation position of the pointer 3. Specifically, as shown in FIG. 4B, the luminance of the light emitted from the light emitting portion 61 is a rotational position where the light emitting diode 5 is disposed, that is, a rotational movement of “60” and “180”. It becomes higher at the position, and lower at the rotation position away from these rotation positions. This is because the light emitting diode 5 is disposed at the rotational positions of “60” and “180” as shown in FIGS. 3B and 4A.

  The relationship between the luminance and the rotation position shown in FIG. 4B is obtained by luminance measuring means (two-dimensional luminance meter CA-1500HMK manufactured by Konica Minolta Sensing Co., Ltd.), but it can also be obtained by simulation calculation. is there.

  The pointer 3 is formed of a transparent resin material such as a transparent acrylic resin, and receives the light emitted from the light emitting portion 61 and reflects the light introduced from the light receiving portion 31 toward the distal end side of the pointer 3. And a reflecting portion 32. The pointer 3 is formed so as to emit light in a predetermined color by reflected light from the reflecting portion 32. In addition, in order to distinguish the output part 61 and the light-receiving part 31 from another site | part, it shows with a thick line in Fig.3 (a).

  The light shielding cap 33 shown in FIGS. 1 and 2 prevents light from the light emitting diode 5 from directly entering the eyes of the driver, and is formed of, for example, a light-shielding resin or a metal plate. .

  As shown in FIG. 4A, the combination meter 1 is viewed from the axial direction of the shaft 5 within a range in which the emitting portion 61, the opening 23, and the light receiving portion 31 (31A, 31B) rotate. Configured to overlap. For example, the light receiving unit 31A corresponds to the rotation position where the pointer 3 indicates the scale 22 corresponding to “0” of the character 21, and the light receiving unit 31B corresponds to “180” of the pointer 3 corresponding to the character 21. This corresponds to the rotation position indicating the scale 22.

  A portion where the emitting portion 61, the opening 23 and the light receiving portion 31 overlap with each other at the rotation position where the pointer 3 is “0” is indicated by a hatched portion in the light receiving portion 31A. A portion where the emission part 61, the opening 23, and the light receiving part 31 overlap at a position is indicated by a hatched part in the light receiving part 31B. This overlapping portion is indicated by a hatched portion in the light receiving portion 31 in FIG.

  The shape of the opening 23 is formed in such a manner that the area of the overlapping portion becomes smaller at the rotation position where the light emitting diode 5 is disposed, that is, at the rotation positions of “60” and “180”. And as shown in FIG. Specifically, as shown in FIG. 4B, the area of the overlapping portion decreases at the rotation positions “60” and “180” and increases at the rotation position away from these rotation positions. Thus, the shape of the opening 23 is determined.

  Here, the light emission luminance of the pointer 3 is determined by the luminous intensity (candela (cd)) of the emitted light from the emitting portion 61 guided into the pointer 3. That is, the light emission luminance of the pointer 3 is determined by the luminous intensity of the emitted light from the emitting part 61 at the part where the emitting part 61, the opening 23 and the light receiving part 31 overlap. This is because the light receiving unit 31 cannot receive the light emitted from the light emitting unit 61 excluding the overlapping portion by being obstructed by the dial 2.

  In principle, the luminous intensity of the emitted light from the emitting portion 61 in the overlapping portion is calculated as the product of the area of the overlapping portion and the luminance of the emitted light from the emitting portion 61 in the overlapping portion. As described above, the brightness of the light emitted from the emitting portion 61 is high at the rotational positions of “60” and “180”, while the area of the overlapping portion is the rotational position of “60” and “180”. The shape of the opening 23 is determined so as to be smaller. Thereby, the luminous intensity of the emitted light from the emission part 61 in the overlapping part becomes substantially constant in the rotation range of the pointer 3.

  That is, the shape of the opening 23 is determined so that the luminous intensity of the emitted light from the emission part 61 at the overlapping portion is substantially constant in the rotation range of the pointer 3. As a result, the brightness of the emitted light from the emitting portion 61 guided into the pointer 3 varies depending on the rotation position of the pointer 3, whereas the emitted light from the emitting portion 61 guided into the pointer 3 The luminous intensity can be made substantially constant in the rotation range of the pointer 3.

  As described above, the luminance of the emitted light from the emitting portion 61 in the overlapping portion is obtained, and the luminous intensity of the emitted light from the emitting portion in the overlapping portion is calculated as the product of the obtained luminance and the area of the overlapping portion. The shape of the opening 23 is determined so that the calculated luminous intensity becomes substantially constant in the rotation range of the pointer 3.

  Thereby, the luminous intensity of the emitted light from the emitting part 61 guided into the pointer 3 can be made substantially constant in the rotation range of the pointer 3, so that the light emission luminance of the pointer can be kept substantially constant. As a result, the fluctuation of the light emission luminance of the pointer 3 due to the rotation position can be easily suppressed by the simple configuration of the shape of the opening 23.

  The electric circuit configuration of the combination meter 1 according to the present embodiment described above will be described with reference to FIG.

  Electric power is constantly supplied from the battery 12 to the control device 9. The ignition switch 11 is connected to be able to detect its operating state (on or off), and a speed sensor 10 that detects the traveling speed of the vehicle is connected to be able to input a detection signal. Further, the light emitting diode 5 and the movement 4 are also connected to the control device 9.

  The operation of the combination meter 1 which is a pointer meter according to an embodiment of the present invention in the above configuration will be described below.

(Operation)
When the ignition switch 11 is turned on by the driver, the control device 9 detects it and starts operation. That is, in FIG. 4, the vehicle speed of the vehicle is calculated based on the output signal from the speed sensor 10, and the movement 4 is driven so that the shaft 41 is rotated by an angle corresponding to the calculated vehicle speed.

  The control device 9 turns on the light emitting diode 5. As shown in FIG. 2, the light emitted from the light-emitting diode 5 is guided by the light guide 6, emits the pointer 3 according to the optical path P1, and transmits and illuminates the dial 2 according to the optical path P2.

  Hereinafter, the light emission of the pointer 3 will be described.

  The light emitted from the light-emitting diode 5 is guided to the light guide 6 according to the optical path P11 shown in FIG. 3 and enters the pointer 3, and is guided to the tip side of the pointer 3 according to the optical path P1 shown in FIG. Reflected upward in FIG. As a result, the pointer 3 is caused to emit light. Specifically, the light from the light emitting diode 5 enters the light guide 6 and exits from the emitting part 61 to the light receiving part 31 of the pointer 3 through the opening 23. Incident light from the light receiving unit 31 is reflected by the reflecting unit 32 toward the distal end side of the pointer 3 and causes the pointer 3 to emit light.

  As described above, the light emission luminance of the pointer 3 is determined by the luminous intensity of the emitted light from the emission part 61 at the part where the emission part 61, the opening 23 and the light receiving part 31 overlap. In addition, the shape of the opening 23 is determined so that the luminous intensity of the emitted light from the emitting portion 61 at the overlapping portion is substantially constant in the rotation range of the pointer 3. As a result, the brightness of the emitted light from the emitting portion 61 guided into the pointer 3 varies depending on the rotation position of the pointer 3, whereas the emitted light from the emitting portion 61 guided into the pointer 3 The luminous intensity can be made substantially constant in the rotation range of the pointer 3.

  As a result, the fluctuation of the light emission luminance of the pointer 3 due to the rotation position can be easily suppressed by the simple configuration of the shape of the opening 23.

(Modification)
FIG. 6 is an enlarged view showing a modification of FIG.

  FIG. 7A is a schematic diagram for explaining the relationship between the portion where the emitting portion 61, the opening 23, and the light receiving portion 31 overlap with each other and the rotational position of the pointer 3 shown in FIG. ) Is a schematic graph for explaining the relationship between the brightness of the emitted light from the emitting portion 61 in the overlapping portion, the area of the overlapping portion, and the rotation position of the pointer 3. FIG.

  In this modified example, as shown in FIG. 6, in order to increase the brightness of the emitted light from the emitting part 61 in the rotation range between “60” and “180” in FIG. It forms in the light guide part 6, Thereby, the opening part 23 is formed in the shape different from the shape shown in FIG.

  In addition, in order to distinguish the output part 61, the reflection part 63, and the light-receiving part 31 from another site | part, it shows with a thick line in FIG. 6 and FIG. 7 (a).

  In addition, a portion where the emitting portion 61, the opening 23, and the light receiving portion 31 overlap with each other at the rotation position where the pointer 3 is “0” is indicated by a hatched portion in the light receiving portion 31A. A portion where the emitting portion 61, the opening 23, and the light receiving portion 31 overlap in the rotational position is indicated by a hatched portion in the light receiving portion 31B.

  The reflection part 63 reflects the light emitted from the light emitting diode 5 incident on the light guide part 6 to the area A in the emission part 61 according to the optical path P12 shown in FIG. The region A is disposed between “60” and “180” rotating positions where the light-emitting diodes 5 are disposed. Unlike the above example shown in FIG. 4B, the brightness of the light emitted from the output unit 61 by the reflecting unit 63 differs from the above example shown in FIG. It becomes high in the rotation range between “80” and “160”.

  Thereby, as shown in FIG. 7B, the area of the overlapping portion becomes smaller in the rotation range between “80” and “160” unlike the above example shown in FIG. 4B. Thus, the shape of the opening 23 is determined. For this reason, since the luminous intensity of the emitted light from the emitting part 61 guided into the pointer 3 can be made substantially constant within the rotation range of the pointer 3, the light emission luminance of the pointer can be kept substantially constant.

  As a result, also in this modification, the fluctuation of the light emission luminance of the pointer 3 due to the rotation position can be easily suppressed by the simple configuration of the shape of the opening 23.

  If the number and arrangement of the light emitting diodes 5 and the structure of the light guide 6 are changed, the luminance of the emitted light from the emitting part 61 guided into the pointer 3 varies depending on the rotation position of the pointer 3. Even in this case, the shape of the opening 23 is determined so that the luminous intensity of the emitted light from the emitting portion 61 guided into the pointer 3 can be made substantially constant in the rotation range of the pointer 3. Thereby, the fluctuation | variation of the light emission luminance of the pointer | guide 3 by a rotation position can be easily suppressed with the simple structure called the shape of the opening part 23. FIG.

  As described above, the combination meter 1 which is a pointer instrument according to the embodiment of the present invention described above includes a dial 2 having an opening 23, a back side of the dial 2, and a viewing side of the dial 2 from the back side. A movement 4 that extends a shaft 41 that is a pointer shaft through the opening 23 and a shaft that is formed from a translucent resin material and rotates along the front side of the dial 2 on the viewing side. 41, the pointer 3 fixed to the tip side of the dial 41, the light emitting diode 5 that is disposed behind the dial 2 and emits the pointer 3, and the light emitting diode 5 that is disposed behind the dial 2 and emits light. A light guide 6 that guides the emitted light into the pointer 3, and the light guide 6 includes a light emitting portion 61 that emits light emitted from the light emitting diode 5 to the pointer 3 through the opening 23. Receives light emitted from section 61 The light emitting portion 61, the opening portion 23, and the light receiving portion 31 are configured to overlap each other when viewed from the axial direction of the shaft 41 in the range in which the pointer 3 rotates, and the shape of the opening portion 23 is The luminous intensity of the emitted light from the emitting portion 61 at the overlapping portion is determined so as to be substantially constant in the rotation range.

  Thereby, the fluctuation | variation of the light emission luminance of the pointer | guide 3 by a rotation position can be easily suppressed with the simple structure called the shape of the opening part 23. FIG.

  Note that the present invention is not limited to the above example, and various modifications can be considered.

FIG. 1 is a partial front view of a combination meter 1 which is a pointer meter according to an embodiment of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. 3A is an enlarged view of the IIIA portion in FIG. 2, and FIG. 3B is an enlarged view of the IIIB portion with the pointer 3 removed in FIG. FIG. 4A is a schematic diagram for explaining the relationship between the portion where the emitting portion 61, the opening 23, and the light receiving portion 31 overlap with each other and the rotational position of the pointer 3 shown in FIG. ) Is a schematic graph for explaining the relationship between the brightness of the emitted light from the emitting portion 61 in the overlapping portion, the area of the overlapping portion, and the rotation position of the pointer 3. FIG. FIG. 5 is a circuit configuration diagram illustrating an electric circuit of the combination meter 1 according to one embodiment of the present invention. FIG. 6 is an enlarged view showing a modification of FIG. FIG. 7A is a schematic diagram for explaining the relationship between the portion where the emitting portion 61, the opening 23, and the light receiving portion 31 overlap with each other and the rotational position of the pointer 3 shown in FIG. ) Is a schematic graph for explaining the relationship between the brightness of the emitted light from the emitting portion 61 in the overlapping portion, the area of the overlapping portion, and the rotation position of the pointer 3. FIG.

Explanation of symbols

1 Combination meter (pointer meter)
2 Dial, 21 characters, 22 scales, 23 Opening 3 Pointer, 31 Light receiving part, 32 Reflecting part, 33 Shading cap 4 Movement (rotating inner unit), 41 Shaft (pointer shaft)
DESCRIPTION OF SYMBOLS 5 Light emitting diode (light source), 6 Light guide part, 61 Output part, 62 Cylindrical part, 63 Reflecting part 7 Case, 8 Printed circuit board, 9 Control apparatus, 10 Speed sensor 11 Ignition switch, 12 Battery

Claims (4)

A dial with an opening,
A rotating inner unit disposed behind the dial and extending a pointer shaft through the opening from the back side to the viewing side of the dial;
A pointer formed from a translucent resin material and fixed to the distal end side of the pointer shaft so as to rotate along the front side of the dial on the viewing side;
A light source disposed behind the dial and emitting the pointer;
A light guide disposed behind the dial and guiding light emitted from the light source into the pointer,
The light guide unit includes an emitting unit that emits light emitted from the light source to the pointer through the opening,
The pointer includes a light receiving unit that receives light emitted from the light emitting unit,
The emitting portion and the opening portion and the light receiving unit, to the extent that the pointer is rotated, the Ri pointer shaft Do heavy viewed from the axial direction, all said emitting portion and the opening portion of the light receiving portion is overlapped Overlapping parts are formed ,
The shape of the opening is set so as to partially block the light that directly enters the light receiving unit from the emitting unit with the dial, and from the emitting unit in the overlapping portion based on the shape of the opening The indicator instrument is set so that the luminous intensity of the emitted light is substantially constant in the rotation range. The brightness of the emitted light from the emitting part in the overlapping portion is calculated by simulation calculation,
The pointer instrument according to claim 1, wherein the luminous intensity at the overlapping portion is calculated as a product of the calculated value and an area of the overlapping portion. The luminance of the emitted light from the emitting portion in the overlapping portion is measured by a luminance measuring means,
The pointer instrument according to claim 1, wherein the luminous intensity at the overlapping portion is calculated as a product of the measured value and the area of the overlapping portion. A dial having an opening, a rotating inner unit disposed behind the dial and extending a pointer shaft through the opening from the back side to the viewing side of the dial, and a translucent resin material And a pointer fixed to the distal end side of the pointer shaft so as to rotate along the front side of the dial on the viewing side, and a light source disposed behind the dial and emitting the pointer, A light guide portion disposed behind the dial and guiding light emitted from the light source into the pointer, and the light guide portion emits light emitted from the light source to the pointer through the opening. The pointer is provided with a light receiving portion that receives light emitted from the emitting portion, and the pointer, the opening, and the light receiving portion are within the range in which the pointer rotates. A method for manufacturing a pointer instrument configured to form overlapping portions when viewed from the axial direction of a shaft,
A first step of determining the luminance of the emitted light from the emitting portion at the overlapping portion;
A second step of calculating the luminous intensity of the emitted light from the emitting portion in the overlapping portion as a product of the luminance obtained in the first step and the area of the overlapping portion;
And a third step of determining the shape of the opening so that the luminous intensity calculated in the second step is substantially constant in the rotation range.

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