JP5440463B2 - Pointer and display device - Google Patents

Description

  The present invention relates to a pointer that is used in a display device that displays an index and emits light by light emitted from a light source of the display device, and a display device that includes the pointer.

  2. Description of the Related Art Conventionally, a display device that displays an index using a pointer that is displaced along a display plate when driven by a motor is known. As a kind of pointer used in such a display device, for example, a light emitting pointer disclosed in Patent Document 1 includes a pointer cover attached to a pointer shaft or the like of a motor, and a light guide extending from the pointer cover along the display plate. And. The light emission pointer disclosed in Patent Document 1 receives light emitted from a light source in the display direction by a pointer light receiving portion formed on the light guide on the side opposite to the display direction of the pointer cover, and guides the light. Emits light by emitting in the display direction from the body. With the above-described configuration, the indicator of the display device can be formed by being displaced along the display plate by being driven by the motor even in an environment with little extraneous light.

JP 2006-242576 A

  In recent years, in order to improve the appearance of a display device, there is a strong demand for a longer light emitting portion that emits light by emitting light from a light source. Therefore, the inventors of the present application have conceived a configuration in which a light emitting portion that emits light is formed long by exposing the light guide to a position beyond the center of the pointer cover.

  However, when the light guide is exposed to a position beyond the center of the pointer cover based on the configuration of Patent Document 1, the pointer light receiving portion formed on the light guide and the light guide are exposed. A case where the light emitting portion is formed to overlap each other in the display direction is likely to occur. If the pointer light receiving unit and the light emitting unit are positioned so as to overlap with each other in this way, the light emitted from the light source in the display direction and received by the pointer light receiving unit is part of the light emitting unit while maintaining the traveling direction. Will be emitted. Therefore, when the intense light is radiated from only a part of the light emitting unit, the luminance unevenness of the light emitting unit is generated. As described above, the pointer could not emit the light emitting part formed long without unevenness.

  As a countermeasure against such luminance unevenness, the inventors of the present application have come up with a configuration in which a diffusing member for diffusing light received by the light receiving unit is provided inside the pointer. However, the shadow of the diffusing member appears on the light emitting part, and the unevenness generated in the light emitting part has not been eliminated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a pointer provided with a light emitting portion that is formed long in the stretching direction and can emit light without unevenness.

In order to achieve the above object, according to the first aspect of the present invention, the display device is used in a display device for displaying an index, and is displaced along a display board by being driven by a motor to form the index. It is a pointer that emits light by light emitted from the light source of the device, an attachment part attached to the motor, an extension part extending from the attachment part along the display plate, and a direction opposite to the indicator display direction in the attachment part A light receiving portion that is formed and receives light emitted from the light source in the display direction, and extends from the extending portion beyond the center of the mounting portion along the extending direction of the extending portion, and displays the light received by the light receiving portion. A light emitting portion that emits light by radiating in a direction, and a reflective portion that is formed on the mounting portion and reflects light from the light source received by the light receiving portion toward the light emitting portion, and the light receiving portion emits light in the display direction. In a position shifted from the part Made, reflecting portion is formed at a position overlapping the light receiving portion in the display direction, characterized that you have convexly curved toward the center line of the pointer that passes through the center of and attachment portion extending along the extending direction As a guideline.

  In the present invention, the light emitting portion that emits light by emitting light in the display direction extends from the extending portion beyond the center of the mounting portion along the extending direction of the extending portion. With this shape, a light emitting portion that is long in the direction along the extending direction of the extending portion can be formed on the pointer.

  In addition, the light receiving portion and the light emitting portion formed together on the attachment portion are formed at positions shifted from each other in the display direction. Therefore, the light emitted from the light source in the display direction and received by the light receiving unit is difficult to be emitted from a part of the light emitting unit while maintaining the traveling direction. As described above, it is possible to suppress the occurrence of uneven brightness of the light emitting unit due to the strong light emitted from only a part of the light emitting unit. Therefore, the pointer can be provided with a light emitting part that is long in the extending direction of the extending part and can emit light uniformly.

  According to the present invention, the light received by the light receiving unit can first reach the reflecting unit formed at a position overlapping the light receiving unit in the display direction. Therefore, the situation where the light received by the light receiving unit is emitted from a part of the light emitting unit while maintaining the traveling direction can be reliably suppressed by the reflecting unit.

  In addition, the reflection unit reflects light from the light source received by the light receiving unit toward the light emitting unit. Therefore, even if the light receiving unit and the light emitting unit are positioned so as to be shifted from each other in the display direction, the amount of light emitted from the light emitting unit can be ensured. As described above, the unevenness of the light emitting unit is reduced while maintaining the high luminance of the light emitting unit.

  According to the present invention, the light reflected by the reflecting portion that extends along the extending direction and passes through the attachment portion and is curved in a convex shape toward the center line of the pointer is diffused in the extending direction to the center line. Proximity. In this way, the reflection part can uniformly reflect the light received by the light receiving part toward the entire light emitting part that is formed long in the extending direction by being curved in a convex shape. Therefore, the unevenness of the light emitting part can be surely reduced.

In the invention according to claim 2 , the reflecting portion reflects the light received by the light receiving portion toward the portion of the light emitting portion that is formed closer to the tip of the extending portion than the mounting portion. A reflecting surface portion and a proximal-side reflecting surface portion that reflects light received by the light-receiving portion toward a portion formed in the mounting portion of the light-emitting portion, and the distal-side reflecting surface portion reflects the proximal-side reflection The area is larger than the surface portion.

  In the present invention, the portion of the light emitting portion that is formed closer to the tip of the extending portion than the attachment portion is caused by the reflection portion being formed at a distance from the reflection portion formed on the attachment portion. The light reflected at is difficult to reach. On the other hand, the light reflected by the reflecting portion is likely to reach the portion formed in the mounting portion of the light emitting portion due to the short distance from the reflecting portion.

  Therefore, the area of the front-side reflecting surface part that reflects light toward the part formed near the tip of the extending part in the light emitting part reflects light toward the part formed in the mounting part of the light emitting part. It is made wider than the area of the base end side reflecting surface portion. Thereby, the quantity of the light which goes to the part formed near the front-end | tip of an extending | stretching part among light emission parts increases. In addition, the amount of light toward the portion formed in the attachment portion of the light emitting portion is reduced. Therefore, the reflection unit can uniformly reflect the light received by the light receiving unit toward the entire light emitting unit. Therefore, the unevenness of the light emitting unit is surely reduced.

According to a third aspect of the present invention, a light guide formed of a translucent material and provided with a light receiving portion and a radiation surface that emits light from the light source received by the light receiving portion toward the display direction; A sheet member formed of a light-sensitive material and provided with a textured surface with irregularities formed thereon, and the sheet member is disposed with the textured surface facing the radiation surface in the display direction of the light guide. Thus, the light emitting part is formed integrally with the radiation surface.

  In the present invention, in the light guide formed of a light-transmitting material, light emitted from the emission surface toward the display direction is incident on a textured surface on which irregularities that are opposite to the emission surface are formed. Refracted in various directions. And the light which passed the embossed surface is formed with a translucent material, and is radiated | emitted toward a display direction from the sheet | seat member which forms a light emission part integrally with the radiation | emission surface of a light guide. In this way, light passes through the textured surface and is diffused by refracting action in various directions on the textured surface. Therefore, the light emitting part formed by the radiation surface and the sheet part can emit light more evenly.

The invention according to claim 4 is characterized in that a gradation for changing the light transmittance in the extending direction is formed in the light emitting portion.

  As described above, it is difficult for the light received by the light receiving portion to reach the portion of the light emitting portion that is formed closer to the tip of the extending portion than the mounting portion. On the other hand, the light received by the light receiving portion easily reaches the portion formed in the mounting portion of the light emitting portion. Therefore, in the present invention, an imbalance in the extending direction of the amount of light reaching the light emitting unit is corrected by a gradation formed in the light emitting unit and changing the light transmittance in the extending direction. Thus, according to the effect of gradation that equalizes the amount of light emitted from the light emitting unit, unevenness of the light emitting unit is reliably reduced.

Moreover, in the form which combined the structure of Claim 4 with the structure of Claim 3 , among the radiation | emission surface of a light guide and the embossed surface of a sheet | seat member which has integrally formed the light emission part. The gradation should just be formed in at least one.

In the invention according to claim 5 , the extending portion is provided with an extending reflecting surface that is located on the side opposite to the light emitting portion in the display direction and reflects light toward the light emitting portion. A gradation for changing the reflectance of the film in the extending direction is formed.

  The configuration for leveling the amount of light emitted from the light emitting unit may be a gradation formed on the stretched reflecting surface as in the present invention. The amount of light reflected toward the light emitting unit can be adjusted by changing the reflectance of the extended reflecting surface located on the opposite side of the light emitting unit in the display direction in the extending direction. Then, according to the effect of gradation that equalizes the amount of light reaching the light emitting portion, the unevenness of the light emitting portion is reliably reduced.

In the invention described in claim 6 , the light guide is formed of a light-transmitting material and provided with the light emitting part and the light receiving part, and is formed of a light shielding material, and the side opposite to the display direction of the light guide is provided. A light shielding member that covers the light receiving portion in the display direction, and a passage hole for allowing light emitted from the light source to pass in the display direction is formed in the light shielding member.

  According to this invention, the light guide provided with the light receiving portion is covered on the side opposite to the display direction by the light shielding member formed of the light shielding material. Therefore, light emitted from the light source in the display direction cannot enter the light guide except for light received by the light receiving unit by passing through the passage hole. Therefore, it is possible to prevent a situation in which light received by a portion that is not the light receiving portion in the light guide causes a part of the light emitting portion provided in the light guide to emit light with high luminance.

In the invention according to claim 7 , the attachment portion has a fitting portion that fits the drive shaft of the motor in order to attach the pointer to the motor, and the fitting portion is provided on the light shielding member. And

  In general, the attaching portion attaches the pointer to the motor by fitting the fitting portion to the drive shaft of the motor. In this embodiment, if the fitting portion is provided in the light guide, light emitted from the light source may enter the light guide from the fitting portion. Therefore, the fitting portion of the attachment portion is preferably provided on the light shielding member that covers the light guide. Thereby, the situation where the light received by the fitting part causes a part of the light emitting part provided in the light guide to emit light with high luminance can be prevented in advance.

According to an eighth aspect of the present invention, the pointer according to any one of the first to seventh aspects, a motor that drives the pointer, a display board that forms an indicator together with the pointer driven by the motor, and light reception of the pointer And a light source that emits light toward the unit.

  In the present invention, the pointer configured so that the light emitting portion is long and emits light uniformly can significantly improve the appearance of the indicator of the display device in an environment with little extraneous light. Thus, in order to realize a display device with excellent appearance, the above-described configuration guideline is particularly suitable.

It is a front view of the speedometer by one Embodiment of this invention. It is a figure for demonstrating the structure of the speedometer by one Embodiment of this invention, Comprising: It is the II-II sectional view taken on the line of FIG. It is a perspective view for demonstrating the structure of the pointer by one Embodiment of this invention. It is a figure for demonstrating the shape of a light guide, Comprising: (a) It is a top view of a light guide, (b) It is a side view of a light guide.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a pointer 10 and a speedometer 100 including the pointer 10 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view for explaining the structure of the speedometer 100. The speedometer 100 is a part of a combination meter housed in an instrument panel provided in a vehicle interior of the vehicle, and is arranged with the front side shown in FIG. 1 facing the driver's seat side.

  As shown in FIGS. 1 and 2, the speedometer 100 includes a display board 80, a stepping motor 60, light emitting diodes 70 and 71, a pointer 10, and the like. The speedometer 100 displays the traveling speed of the vehicle on which the combination meter is mounted as an index by the pointer 10 that is rotationally displaced along the display plate 80. The speedometer 100 drives the pointer 10 by a stepping motor 60. In addition, the speedometer 100 causes the pointer 10 to emit light by light emitted from the light emitting diode 70.

  The display board 80 has a plurality of scales 81 and numerals 82 for displaying the traveling speed of the vehicle together with the rotating pointer 10. The plurality of scales 81 and numerals 82 are formed along the displacement trajectory of the pointer 10. In the display direction in which the speedometer 100 displays an indicator such as a traveling speed, one of the plurality of scales 81 overlaps the tip of the pointer 10. Thereby, the display board 80 can form a display showing the traveling speed together with the pointer 10.

  The display board 80 is formed in a disk shape with a translucent material such as colorless and transparent polycarbonate. The display board 80 is formed by performing light-shielding printing on the surface of a sheet material such as polycarbonate molded to a thickness of about 0.5 millimeters. In the display board 80, portions corresponding to the scales 81 and the numbers 82 are light-transmitting portions where light-transmitting printing is performed instead of light-blocking printing. This translucent portion radiates from the light emitting diode 71 and the like provided in the direction opposite to the display direction of the display panel 80 (hereinafter referred to as the back direction, and the side opposite to the display direction as the back side). Transmitted light can be transmitted. Further, a circular opening 83 concentric with the display plate 80 is formed in the central portion of the display plate 80 in the radial direction.

  The stepping motor 60 has a pointer shaft 61 that rotates in accordance with a control signal from a control circuit (not shown) of the combination meter. The pointer shaft 61 protrudes in the display direction from the main body of the stepping motor 60 attached to the circuit board 90 of the combination meter. A pointer 10 is attached to the tip of the pointer shaft 61 in the protruding direction. The stepping motor 60 causes the speedometer 100 to display an indicator such as a traveling speed by rotating the pointer 10 together with the pointer shaft 61.

  The light emitting diodes 70 and 71 are light emitting elements that emit light when a voltage is applied from a control circuit (not shown) of the combination meter. The light emitting diodes 70 and 71 are mounted on the surface of the circuit board 90 in the display direction. A plurality of the light emitting diodes 70 are mounted so as to surround the pointer shaft 61 and emit light toward the display direction. The light emitting diode 71 is located in the back direction of the display panel 80 as described above. The light emitting diode 71 emits light toward the display direction, and causes the light transmitting portion of the display panel 80 to emit light.

  The pointer 10 includes an attachment part 11, an extending part 13, a light emitting part 15, and a light receiving part 17. The attachment portion 11 is disposed at the center portion of the speedometer 100 in the radial direction, and is attached to the distal end of the pointer shaft 61 protruding from the stepping motor 60. The attachment portion 11 is located in the display direction of the opening portion 83 of the display plate 80 and covers the opening portion 83. The attachment portion 11 is formed in a cylindrical shape. The axial direction of the attachment portion 11 is along the display direction.

  The extending portion 13 extends from the attaching portion 11 to the radially outer side of the attaching portion 11. The extending direction in which the extending portion 13 extends is along the surface of the display plate 80 in the display direction. The extending portion 13 is rotationally displaced along the surface of the display plate 80 by the rotation of the pointer 10. The tip of the extending portion 13 in the extending direction can overlap with any one of the plurality of scales 81 formed on the display plate 80 in the display direction by the rotation of the pointer 10.

  The light receiving portion 17 is formed on the back side of the attachment portion 11. The light receiving unit 17 faces the light emitting diode 70 in the display direction. The light receiving unit 17 receives light emitted from the light emitting diode 70 in the display direction.

  The light emitting part 15 is formed in the attachment part 11 and the extending part 13 at a position visible from the front side. The light emitting portion 15 extends from the extending portion 13 beyond the center of the attaching portion 11 along the extending direction of the extending portion 13. One end of the light emitting portion 15 in the extending direction reaches the tip of the extending portion 13. On the other hand, the other end of the light emitting portion 15 in the extending direction reaches the periphery of the attachment portion 11. With such a shape, the length of the light emitting portion 15 in the extending direction is approximately the same as the combined length of the extending portion 13 and the outer diameter of the mounting portion 11. The light emitting unit 15 emits light by emitting the light received by the light receiving unit 17 in the display direction.

  The speedometer 100 having the above configuration causes the scale 81 and the number 82 to be displayed in a light-emitting manner. In addition, the speedometer 100 causes the light emitting unit 15 of the pointer 10 to emit light. As a result, the speedometer 100 can allow the viewer to visually recognize the traveling speed of the vehicle even in an environment with little extraneous light.

  Next, the characteristic part of the pointer 10 will be described. In the pointer 10, the light receiving portion 17 is formed at a position shifted from the light emitting portion 15 in the display direction. Hereinafter, the configuration of the pointer 10 will be described in more detail with reference to FIGS. 3 and 4.

  The pointer 10 includes a front cap 20, an optical sheet 30, a light guide 40, a back cap 50, and the like.

  The front cap 20 is made of a material having high light shielding properties, such as ABS resin or polypropylene (PP) resin. A space for accommodating the light guide 40 and the optical sheet 30 is formed inside the front cap 20. The front cap 20 has a cap body 21 and a cap extension 23. A light emitting hole 25 is formed in the front cap 20.

  The cap main body portion 21 is formed in a columnar shape, and constitutes the attachment portion 11 together with the light guide 40, the back cap 50, and the like. The cap extending portion 23 extends outward in the radial direction from the cap main body portion 21 and constitutes the extending portion 13 together with the light guide 40 and the back cap 50.

  The light emitting hole 25 is opened from the cap main body portion 21 to the cap extending portion 23 in the front cap 20. The shape of the light emitting hole 25 defines the contour of the light emitting unit 15. From the front side of the speedometer 100, the optical sheet 30 accommodated in the front cap 20 is visually recognized through the light emitting hole 25.

  The light guide 40 is formed of a translucent material, such as an acrylic resin or a polycarbonate resin. The light guide 40 has a light guide body 41 and a light guide extension 43. The light guide 40 is formed with a light receiving portion 17, a radiation surface 47, a reflection surface 44, and a stretched reflection surface 45.

  The light guide main body 41 is formed in a cylindrical shape and is accommodated in the cap main body 21 of the front cap 20. The light guide body portion 41 is included in the attachment portion 11. The light guide extending portion 43 extends radially outward from the cap body portion 21 and is accommodated in the cap extending portion 23 of the front cap 20. The light guide extension 43 is included in the extension 13.

  The light receiving portion 17 is formed on the bottom surface 41 a located on the back side of the light guide main body portion 41. A pair of light receiving portions 17 are formed symmetrically with respect to the center line 10 a of the pointer 10. The light receiving portion 17 is formed so as to avoid a range overlapping with the radiation surface 47 in the display direction. The bottom surface 41 a of the light guide main body 41 faces the light emitting diode 70 in the display direction in a state where the pointer 10 is attached to the pointer shaft 61. The light receiving unit 17 receives light emitted in the display direction by the light emitting diode 70 and causes the light to enter the light guide 40. The center line 10 a of the pointer 10 is a virtual line that extends along the extending direction of the extending portion 13 and passes through the communication of the mounting portion 11.

  The radiation surface 47 forms the light emitting portion 15 of the pointer 10 together with the optical sheet 30. The radiation surface 47 is the top surface of the light guide 40 in the display direction, and is formed from the light guide extension 43 to the light guide body 41. The radiation surface 47 is formed at a position shifted from the light receiving unit 17 in the display direction. The radiation surface 47 radiates the light from the light emitting diode 70 that has entered the light guide 40 through the light receiving unit 17 in the display direction. On the radiation surface 47, a gradation 47a for changing the light transmittance in the extending direction is formed by printing.

  The reflection surface 44 is formed on the top surface 41 b located in the display direction of the light guide main body 41. A pair of reflecting surfaces 44 is formed at a position overlapping the light receiving unit 17 in the display direction. Each reflecting surface 44 faces the back direction. In addition, the reflecting surfaces 44 face each other across the center line 10 a of the pointer 10. With the above shape, the reflection surface 44 reflects the light from the light emitting diode 70 received by the light receiving unit 17 toward the radiation surface 47.

  Further, the shape of the reflecting surface 44 will be described in detail. The reflecting surface 44 is curved in a convex shape toward the center line 10a of the pointer 10. Specifically, the shape of the side surface of the cone is applied to the shape of the reflection surface 44. The reflective surface 44 has a mortar shape, such as a part of the cylindrical light guide main body 41 scraped off by a conical shape, and as it goes from the top surface 41b to the bottom surface 41a along the display direction, Curvature curvature is increasing.

  For the sake of convenience, the reflection surface 44 is divided into a distal-end-side reflection surface portion 44a, a proximal-end-side reflection surface portion 44c, and a central reflection-surface portion 44b. The front-end-side reflection surface portion 44a reflects light received by the light receiving portion 17 toward a portion of the radiation surface 47 that is formed closer to the front end of the light guide extension portion 43 than the light guide main body portion 41. It is the range to do. The proximal-side reflection surface portion 44 c is a range in which light received by the light receiving portion 17 is reflected toward a portion of the radiation surface 47 mainly formed in the light guide main body portion 41. The central reflection surface portion 44b is a range between the distal-end-side reflection surface portion 44a and the proximal-end-side reflection surface portion 44c. In the present embodiment, the position at which the reflecting surface 44 is formed and the angle at which the reflecting surface 44 is formed so that the area increases in the order of the base-side reflecting surface portion 44c, the center reflecting surface portion 44b, and the tip-side reflecting surface portion 44a. Have been adjusted.

  The stretch reflecting surface 45 is formed on the bottom surface of the light guide stretching portion 43. The stretch reflecting surface 45 is located on the back side of the radiation surface 47 in the display direction, and reflects the light in the light guide stretching portion 43 toward the radiation surface 47. A gradation 45a for changing the light reflectance in the extending direction is formed on the extended reflecting surface 45 by printing.

  The optical sheet 30 is formed in a sheet shape from a light-transmitting material such as an acrylic resin or a polycarbonate resin. The optical sheet 30 is formed larger than the light emitting hole 25 of the front cap 20. The optical sheet 30 is accommodated in a space in the front cap 20 together with the light guide 40 and is sandwiched between the front cap 20 and the light guide 40. The surface of the optical sheet 30 in the display direction is a radiation surface 31 for emitting light. The radiation surface 31 is a smooth plane. On the other hand, the surface of the optical sheet 30 in the back direction is a textured surface 33 on which minute irregularities are formed. The optical sheet 30 is disposed in the display direction of the light guide 40 with the embossed surface 33 opposed to the radiation surface 47, thereby forming the light emitting portion 15 of the pointer 10 integrally with the radiation surface 47. The embossed surface 33 is in close contact with the radiation surface 47 of the light guide 40 and suppresses the total reflection of light on the radiation surface 47, thereby increasing the amount of light incident on the optical sheet 30 from the light guide 40. . Further, when entering the optical sheet 30, the light is refracted in various directions by the unevenness of the embossed surface 33. By exhibiting the refracting action of the embossed surface 33, the optical sheet 30 can diffuse the light incident from the embossed surface 33 inside and radiate it from the radiation surface 31 in a state where unevenness is reduced.

  The back cap 50 is made of a highly light-shielding material such as ABS resin or PP resin. The back cap 50 limits the light incident on the light guide 40 by covering the back direction of the light guide 40. The back cap 50 has a cover main body 51 and a cover extending portion 53. The cover main body 51 is formed in a disc shape, and constitutes the attachment portion 11 together with the light guide main body 41 of the light guide 40 and the cap main body 21 of the front cap 20. The cover extending portion 53 extends outward in the radial direction from the cover main body portion 51 and constitutes the extending portion 13 together with the light guide extending portion 43 of the light guide 40 and the cap extending portion 23 of the front cap 20. .

  The back cap 50 is formed with a light receiving hole 55 and a fitting shaft 57. The light receiving hole 55 is a through hole formed in the cover main body 51 in order to allow light emitted from the light emitting diode 70 in the display direction to pass therethrough. The light receiving hole 55 is formed in the cover main body portion 51 in a range overlapping the light receiving portion 17 in the display direction. The shape of the light receiving portion 17 is defined by the shape of the light receiving hole 55.

  The fitting shaft 57 protrudes from the center of the cover main body 51 in the back direction. The fitting shaft 57 is a structure for attaching the pointer 10 to the stepping motor 60. The fitting shaft 57 is formed in a cylindrical shape and is fitted on the pointer shaft 61 of the stepping motor 60.

  Here, the gradations 47a and 45a formed on the radiation surface 47 and the extended reflection surface 45 will be described in more detail. The printing for forming the gradations 47a and 45a is to form fine dots on the radiation surface 47 and the stretched reflection surface 45 with a paint. By changing at least one of the size of dots and the density of dots, the transmittance changes in the gradation 47a, and the reflectance changes in the gradation 45a. This gradation is for suppressing unevenness in luminance of the light emitting unit 15, and the size of each dot and the density of the dots may be changed as appropriate. In addition, gradation may be formed on the radiation surface 31 and the textured surface 33 of the optical sheet 30.

  In the present embodiment described so far, the light emitting portion 15 extends from the extending portion 13 beyond the center of the mounting portion 11 along the extending direction of the extending portion 13. With this shape, the light emitting portion 15 that is long in the direction along the extending direction of the extending portion 13 can be formed on the pointer 10.

  In addition, the light receiving portion 17 and the light emitting portion 15 formed together with the attachment portion 11 are formed at positions shifted from each other in the display direction. Therefore, the light emitted from the light emitting diode 70 in the display direction and received by the light receiving unit 17 is difficult to be emitted from a part of the light emitting unit 15 while maintaining the traveling direction. As described above, the occurrence of uneven brightness in the light emitting unit 15 due to the strong light being emitted from only a part of the light emitting unit 15 can be suppressed. Therefore, the pointer 10 can be provided with the light emitting portion 15 that is long in the extending direction of the extending portion 13 and can emit light uniformly.

  In addition, in the present embodiment, the light received by the light receiving unit 17 can first reach the reflection surface 44 formed at a position overlapping the light receiving unit 17 in the display direction. Therefore, the situation where the light received by the light receiving unit 17 is emitted from a part of the light emitting unit 15 while maintaining the traveling direction can be reliably suppressed by the reflecting surface 44.

  In addition, the reflection surface 44 reflects light from the light source received by the light receiving unit 17 toward the radiation surface 47. Therefore, even if the light receiving unit 17 and the light emitting unit 15 including the radiation surface 47 are shifted from each other in the display direction, the amount of light emitted from the light emitting unit 15 can be ensured. As described above, the pointer 10 can reduce unevenness of the light emitting unit 15 while maintaining the high luminance of the light emitting unit 15.

  In the present embodiment, the light reflected by the reflecting surface 44 that is curved in a convex shape toward the center line 10a of the pointer 10 is diffused in the extending direction and approaches the center line 10a. Thus, the reflecting surface 44 uniformly reflects the light received by the light receiving unit 17 toward the entire light emitting unit 15 formed long in the extending direction due to the convexly curved shape. obtain. Therefore, the unevenness of the light emitting unit 15 can be surely reduced.

  Furthermore, in the present embodiment, the portion of the light emitting portion 15 that is formed closer to the tip of the extending portion 13 than the mounting portion 11 is caused by the distance from the reflecting surface 44 being far away from the reflecting surface 44. The light reflected at 44 is difficult to reach. On the other hand, the light reflected by the reflecting surface 44 is likely to reach the portion of the light emitting portion 15 formed on the mounting portion 11 because the distance from the reflecting surface 44 is short.

  Thus, by making the area of the distal-end-side reflecting surface portion 44a larger than the area of the proximal-side reflecting surface portion 44c, the amount of light toward the portion of the light emitting portion 15 that is close to the distal end of the extending portion 13 is increased. On the other hand, the amount of light traveling toward the portion of the light emitting portion 15 formed on the attachment portion 11 is reduced. Therefore, the reflecting surface 44 can uniformly reflect the light received by the light receiving unit 17 toward the entire light emitting unit 15. Therefore, the pointer 10 can more reliably reduce the unevenness of the light emitting unit 15.

  In addition, in the present embodiment, the gradation 47 a that changes the light transmittance of the radiation surface 47 and the gradation 45 a that changes the light reflectance of the extended reflecting surface 45 are the extending direction of the amount of light reaching the light emitting unit 15. It can exert the effect of correcting the imbalance. Further, the embossed surface 33 can refract light incident on the optical sheet 30 in various directions. Therefore, light passes through the textured surface 33 and is diffused by refraction of the textured surface 33 in various directions. By these actions, the unevenness of the light emitting unit 15 can be further reliably reduced.

  In addition, in the present embodiment, the light guide 40 is covered by the back cap 50 on the back side. Therefore, light emitted from the light emitting diode 70 in the display direction cannot enter the light guide 40 except for light received by the light receiving unit 17 by passing through the light receiving hole 55. Therefore, it is possible to prevent a situation in which light received by the light guide body 40 that is not the light receiving unit 17 is emitted from the radiation surface 47 and causes a part of the light emitting unit 15 to emit light with high luminance. .

  Furthermore, if the fitting shaft 57 is provided in the light guide, light emitted from the light emitting diode 70 may enter the light guide 40 from the fitting shaft 57. Therefore, as in the present embodiment, the fitting shaft 57 of the mounting portion 11 is preferably provided on the back cap 50 that covers the light guide 40. Thereby, the situation where the light received by the fitting shaft 57 is emitted from the radiation surface 47 of the light guide 40 and causes a part of the light emitting unit 15 to emit light with high luminance can be prevented in advance.

  The pointer 10 configured so that the light emitting unit 15 is long and emits light evenly can remarkably improve the appearance of the index of the speedometer 100 in an environment with little extraneous light. Thus, in order to realize a display device such as the speedometer 100 that is excellent in appearance, the pointer 10 having the above-described configuration is particularly suitable.

  In this embodiment, the optical sheet 30 corresponds to the “sheet member” recited in the claims, the reflecting surface 44 corresponds to the “reflecting portion” recited in the claims, and the back cap 50 is patented. The light receiving hole 55 corresponds to the “passing hole” described in the claims, and the fitting shaft 57 corresponds to the “fitting portion” described in the claims. The stepping motor 60 corresponds to the “motor” described in the claims, the pointer shaft 61 corresponds to the “drive shaft” described in the claims, and the light emitting diode 70 corresponds to the claims. The speedometer 100 corresponds to the “display device” described in the claims.

(Other embodiments)
As mentioned above, although one embodiment by the present invention was described, the present invention is not interpreted limited to the above-mentioned embodiment, and can be applied to various embodiments within the range which does not deviate from the gist.

  In the above embodiment, the reflecting surface 44 is formed at a position overlapping the light receiving unit 17 in the display direction. However, the position where the reflecting surface is formed is not limited to the position overlapping the light receiving unit 17. For example, a light guide having a plurality of reflection surfaces may guide the light from the light emitting diode 70 received by the light receiving unit 17 to the light emitting unit 15 that is shifted from the light receiving unit 17 in the display direction.

  In the above embodiment, the reflecting surface 44 is a curved surface that curves convexly toward the center line 10a, and is a curved surface to which the shape of the side surface of the cone is applied. However, the shape of the reflecting surface is not limited as long as light incident on the light guide from the light receiving unit can be reflected toward the radiation surface and the light emitting unit. For example, the reflective surface may be a flat surface. Alternatively, the reflection surface may be configured by combining a plurality of curved surfaces or planes.

  In the above embodiment, in the reflection surface 44, the distal-end-side reflection surface portion 44a is wider than the central reflection-surface portion 44b and the proximal-end-side reflection surface portion 44c. However, the shape of the reflecting surface may be appropriately changed according to the shape of the pointer as long as light emission without unevenness of the light emitting portion can be realized.

  In the above embodiment, the optical sheet 30 that forms the light emitting unit 15 integrally with the radiation surface 47 of the light guide 40 is provided between the light guide 40 and the front cap 20. However, a sheet member such as the optical sheet 30 may be omitted if light can be emitted from the radiation surface 47 of the light guide 40 without any unevenness. Thereby, the number of parts of the pointer can be reduced, and consequently the cost can be reduced. Further, the configuration of the sheet member is not limited to that of the above embodiment as long as the effect of reducing unevenness of the light emitting portion can be exhibited. For example, wrinkles may be formed on both sides of the sheet member. Alternatively, both surfaces of the sheet member may be smooth surfaces. Furthermore, the sheet member may further exhibit an effect of reducing unevenness of the light emitting part by having a textured surface with the unevenness changed in the stretching direction on the textured surface.

  In the above-described embodiment, gradation by printing is formed on the radiation surface 47 and the extended reflection surface 45. However, if the transmittance or the reflectance can be changed, the method for forming the gradation may not be printing. For example, an effect equivalent to gradation may be imparted to the radiation surface and the stretch reflection surface by forming a texture on the radiation surface and the stretch reflection surface and changing the size of the texture in the stretch direction. Alternatively, the radiating surface and the stretched reflecting surface may be uniformly coated with white or red paint, instead of gradation. In addition, the color of the paint is preferably matched with the light emission color of the light emitting portion.

  In the above embodiment, the light guide 40 is accommodated in the front cap 20 and the back cap 50. However, the light guide may not be covered with a light-shielding member. Moreover, if it can be confirmed that unevenness is not generated in the light emitting portion, a fitting portion for attaching the pointer to the pointer shaft may be provided in the light guide.

  In the said embodiment, although this invention was demonstrated based on the example applied to the speedometer 100 which displays the driving speed of a vehicle, this invention can be applied to the display apparatus in general which displays a parameter | index with a pointer | guide. The present invention may be applied to a display device mounted on a vehicle, for example, a tachometer, a fuel gauge, a water temperature gauge, and the like.

DESCRIPTION OF SYMBOLS 10 Pointer, 10a Center line, 11 Attachment part, 13 Extension part, 15 Light emission part, 17 Light reception part, 20 Table cap, 21 Cap main-body part, 23 Cap extension part, 25 Light emission hole, 30 Optical sheet (sheet member), 33 Wrinkle surface, 40 Light guide body, 41 Light guide body portion, 41a Bottom surface, 41b Top surface, 43 Light guide extending portion, 44 Reflecting surface (reflecting portion), 44a Tip side reflecting surface portion, 44b Central reflecting surface portion, 44c Base end side Reflective surface, 45 Stretched reflective surface, 45a gradation, 47 Radiation surface, 47a gradation, 50 Back cap (light shielding member), 51 Cover body portion, 53 Cover extended portion, 55 Light receiving hole (passing hole), 57 Fitting shaft (Fitting) Joint step), 60 stepping motor (motor), 61 pointer shaft (drive shaft), 70 light emitting diode (light source), 71 light emitting diode, 0 Display panel, 81 graduations, 82 digits, 83 opening, 90 the circuit board, 100 speedometer (display device)

Claims (8)

A pointer that is used in a display device that displays an index, is displaced along a display plate by being driven by a motor to form the index, and emits light by light emitted from a light source of the display device. ,
An attachment portion attached to the motor;
An extending portion extending from the attachment portion along the display plate;
A light receiving portion that is formed on the side opposite to the display direction of the indicator in the mounting portion and receives light emitted from the light source in the display direction;
A light emitting unit that emits light by emitting light received by the light receiving unit in the display direction, extending from the extending unit beyond the center of the mounting unit along the extending direction of the extending unit,
A reflective portion that is formed on the mounting portion and reflects light from the light source received by the light receiving portion toward the light emitting portion ;
The light receiving part is formed at a position shifted from the light emitting part in the display direction ,
The reflecting portion is formed at a position overlapping the light receiving portion in the display direction, and is curved in a convex shape toward the center line of the pointer extending along the extending direction and passing through the center of the mounting portion. Guidelines characterized by that. The reflective portion is
Of the light emitting portion, a tip-side reflecting surface portion that reflects light received by the light receiving portion toward a portion formed closer to the tip of the extending portion than the attachment portion;
Of the light-emitting part, it has a base-end-side reflecting surface part that reflects the light received by the light-receiving part toward the part formed in the attachment part,
The pointer according to claim 1, wherein the distal-end-side reflection surface portion has a larger area than the proximal-end-side reflection surface portion . A light guide formed of a translucent material and provided with a radiation surface that emits light from the light source received by the light receiving unit and the light receiving unit toward the display direction;
A sheet member formed of a translucent material and provided with a textured surface with irregularities;
With
The sheet member, the display direction of the light guide, by being disposed the embossed surface by relatively with said emitting surface, characterized that you form the light emitting portion integral with the emitting surface The guideline according to claim 1 or 2. The indicator according to any one of claims 1 to 3 , wherein a gradation for changing light transmittance in the extending direction is formed in the light emitting portion . The extending portion is provided on the opposite side of the light emitting portion in the display direction and provided with an extending reflecting surface that reflects light toward the light emitting portion,
The stretching reflective surface, Guidelines according to claim 1 gradient for changing the reflectivity of light in the stretching direction is formed, characterized in Rukoto. A light guide formed of a light-transmitting material and provided with the light emitting unit and the light receiving unit;
A light shielding member that is formed of a light shielding material and covers a side opposite to the display direction of the light guide,
6. A passage hole for allowing light emitted from the light source to pass in the display direction is formed in the light shielding member in a range overlapping with the light receiving unit in the display direction. The guideline described in any one of the above. The mounting portion has a fitting portion that fits to a drive shaft of the motor in order to attach the pointer to the motor.
Guidance according to claim 6 wherein the fitting portion, characterized by Rukoto provided in the light shielding member. The guideline according to any one of claims 1 to 7,
  The motor for driving the pointer;
  The display board forming the indicator together with the pointer driven by the motor;
  The light source that emits light toward the light receiving portion of the pointer;
A display device comprising:

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