JP5713704B2 - Pointer member, pointer unit, and pointer instrument - Google Patents

Description

  The present invention relates to a pointer member made of a light-transmitting material that receives light from a light source, a pointer unit having the pointer member, and a pointer instrument having the pointer unit.

  In general, a vehicle is equipped with a vehicle display device that displays measurement values such as a vehicle speed and an engine speed, and in many vehicles, the vehicle display device includes a pointer instrument. The pointer instrument is equipped with a dial with a scale and indicators such as numbers, letters or symbols on the surface, a pointer unit that is placed on the front side of the dial and points to the indicator on the dial, and a pointer unit The meter case includes a driving device that rotates the pointer shaft according to the measurement amount, and a wiring board on which a circuit pattern, electronic components, and the like are provided and the driving device is fixed.

  And in order to make it easy to see the pointer unit provided in such a pointer instrument even in the dark, the pointer member constituting the pointer unit is formed of a light-transmitting synthetic resin as a light-transmitting material. Various techniques have been disclosed in which light from a light source is guided into a member to shine the pointer member. And the light emission pointer | guide shown in patent document 1 etc. has a hollow reflective part provided with the reflective surface which reflects a part of light from a light source toward the front-end | tip direction of a pointer | guide.

  For example, a pointer instrument 901, a part of which is shown in FIG. 9, includes a dial 902, a self-luminous pointer 903 as a pointer unit, a driving device 904 including a pointer shaft 914 that is rotated according to a measurement amount, a wiring A plate 905 and a light source 906 are provided. The self-light emitting pointer 903 includes a pointer main body 931 as a pointer member having a base portion 940 and a pointer portion 950 integrally formed of a translucent synthetic resin, and covers the pointer main body 931 and an upper surface 953 of the pointer portion 950. And a cover member 932 provided with a slit for exposing toward the surface. The pointer main body 931 guides the light received by the base portion 940 to the pointer portion 950 and emits the light from the upper surface 953 of the pointer portion 950 toward the viewer, whereby the upper surface 953 of the pointer portion is slit in the cover member 932. Light emission is visible through.

  The base 940 of the pointer main body 931 includes a cylindrical base main body 941 attached to the tip of the pointer shaft 914 that also serves as a light guide member, a light receiving portion 942 that receives the light L of the light source 906 guided by the pointer shaft 914, Is provided. The pointer portion 950 of the pointer main body 931 is provided with a pointing portion 951 and a rear portion 952 that are extended from the base portion 940 in the pointing direction S1 that intersects the axis P of the pointer shaft 914 and in the opposite rear end direction S2, respectively. Further, a hollow reflecting portion 960 that penetrates the pointer portion 950 in the width direction (front-back direction in FIG. 9) is provided in the pointer portion 950 in the vicinity of the upper end 941a of the base body 941.

  The hollow reflecting portion 960 is formed in a substantially isosceles triangle shape including a pointing direction reflecting surface 961, a rear end direction reflecting surface 962, and a transmitting surface 963 that are each formed in a flat shape. Further, a corner portion 960 a formed by intersecting the indication direction reflection surface 961 and the rear end direction reflection surface 962 is disposed to face the light receiving portion 942 of the base portion 940. As shown in FIG. 10, the pointing direction reflecting surface 961 reflects a part L1 of the light L received by the light receiving unit 942 in the pointing direction S1 (left direction in FIG. 10) and the other part of the light L. L3 is transmitted to the transmission surface 963 side. Further, the rear end direction reflecting surface 962 reflects a part L2 of the light L received by the light receiving unit 942 in the rear end direction S2 (right direction in FIG. 10) and transmits another part L3 of the light L. The light passes through the surface 963 side.

  The light L1 travels in the pointing portion 951 in the pointing direction S1 and is emitted from the portion R1 on the upper surface 953 on the pointing portion 951 side, and the light L2 travels in the rear portion 952 in the rear end direction S2. In addition, the light L3 is emitted from the portion R2 on the upper surface 953 on the rear portion 952 side, and the light L3 enters the transmission surface 963 and then exits from the portion R3 on the upper surface 953 above the hollow reflective portion 960. The entire upper surface 953 shines.

Japanese Utility Model Publication No. 6-12995

  As schematically shown in FIG. 11, in the vicinity of the hollow reflecting portion 960, a part of the light L, L1 ′ and L2 ′, is directed directly from the light receiving portion 942 to the upper surface 953 or the indication direction reflecting surface 961. After being reflected by the rear-end-direction reflecting surface 962, it proceeds through the pointer portion 950 toward the upper surface 953. The light component L3 ′ near the pointing direction reflection surface 961 and the light component L3 ″ near the rear end direction reflection surface 962 included in the light L3 pass through the hollow reflection portion 960 and pass through the transmission surface 963. Then, the light travels through the pointer portion 950 toward the upper surface 953.

  However, since the transmission surface 963 is formed in a flat shape, when the light components L3 ′ and L3 ″ are incident on the transmission surface 963, the refractive index of the synthetic resin is higher than the refractive index of air, which is shown in FIG. As described above, the refraction angles θ2 and θ4 are smaller than the incident angles θ1 and θ3. Therefore, the light components L3 ′ and L3 ″ advance in the traveling direction inwardly (toward each other). The same applies to light components other than the light components L3 ′ and L3 ″ included in the light L3.

  In other words, the spread angle (θ2 + θ4) of the light L3 after entering the transmission surface 963 is narrower than the spread angle (θ1 + θ3) of the light L3 before entering the transmission surface 963, thereby The portion R3 of the upper surface 953 of the pointer portion 950 is narrowed, and the amount of light emitted from the portion R4 (between the portion R1 and the portion R3) located on the extension of the pointing direction reflection surface 961 on the upper surface 953 is reduced. Similarly, a portion R5 (between the portion R2 and the portion R3) located on the extension of the rear end direction reflection surface 962 on the upper surface 953 of the pointer portion 950 is also a dark portion. There was a problem that. In order to prevent such a problem, as shown in FIG. 12, a synthetic resin containing a diffusing agent that transmits and scatters light is used in the hollow reflecting portion 960 so that the hollow reflecting portion 960 has substantially the same shape. A configuration in which the formed light diffusion component 970 is inserted or a filter member is provided on the transmission surface 963 as in the light emission guideline disclosed in Patent Document 1 can be considered. There is another problem that the number of man-hours increases and the manufacturing cost of the pointer member increases.

  The present invention aims to solve the above problems. That is, an object of the present invention is to provide an inexpensive pointer member that can prevent uneven brightness on the upper surface of the pointer portion, a pointer unit having the pointer member, and a pointer instrument having the pointer unit.

  In order to achieve the above-mentioned object, the invention described in claim 1 is extended to a base portion that receives light from a light source, and to a pointing direction and a rear end direction opposite to the pointing direction from one end of the base portion. And a hollow reflecting portion provided in the pointer portion so as to be opposed to the base portion so as to reflect light received by the base portion in the pointing direction and the rear end direction. In the pointer member made of material, the hollow reflecting portion is configured to reflect a part of the light received by the base portion in the pointing direction and to transmit the other part of the light. After being formed so as to cross a surface and the direction-direction reflecting surface and reflect a part of the light received by the base in the rear end direction and transmit the other part of the light End direction reflection surface, the indication direction reflection surface and the rear end direction reflection And a transmission surface arranged opposite to the upper surface of the pointer portion, and the transmission surface is connected from the one end connected to the pointing direction reflection surface to the rear end direction. The pointer member is characterized in that it is formed in a convex curved surface toward the upper surface of the pointer portion over the other end connected to the reflecting surface.

  In order to achieve the above object, the invention described in claim 2 covers the pointer member according to claim 1 and the pointer portion that covers the pointer portion of the pointer member and is directed to the side opposite to the base portion side. And a cover member provided with a slit through which light from the upper surface passes.

  In order to achieve the above object, a third aspect of the present invention is directed to the pointer unit according to the second aspect, and a drive device that rotates the pointer shaft to which the pointer unit is attached in accordance with the measurement amount. And a light source that emits light received by the pointer member of the pointer unit.

  According to the present invention, the hollow reflecting portion provided in the pointer portion of the pointer member has the pointing direction reflecting surface, the rear end direction reflecting surface and the transmitting surface, and the transmitting surface is connected to the pointing direction reflecting surface. Since it is formed in a curved surface convex toward the upper surface of the pointer portion from one end to the other end connected to the rear end direction reflecting surface, the light transmitted through each of the pointing direction reflecting surface and the rear end direction reflecting surface is transmitted. The light is adjusted such that the spread angle after the incident angle to the surface is adjusted and the light is incident on the transmission surface is larger than the spread angle when the transmission surface is formed in a flat shape. Therefore, by adjusting the shape of the transmission surface and adjusting the spread angle of the light appropriately, the dark portion in the vicinity of the position located on the extension of the pointing direction reflection surface and the rear end direction reflection surface on the upper surface of the pointer portion Providing a light diffusing member, etc. Ku, it is possible to prevent luminance unevenness on the upper surface of the pointer portion inexpensive.

It is sectional drawing of the display apparatus for vehicles which is one Embodiment of the pointer instrument of this invention. FIG. 2 is an exploded three-dimensional view of a self-luminous pointer (pointer unit) included in the vehicle display device of FIG. 1. (A) is the partial perspective view which looked at the pointer main body of the self-light-emitting pointer of FIG. 2 from the diagonal direction, (b) is the partial side view which looked at the pointer part of the pointer main body from the width direction. It is a figure for demonstrating the light reflected and permeate | transmitted by the hollow-shaped reflection part of the pointer main body of FIG. It is the figure which expanded the hollow reflective part vicinity of FIG. It is a figure which shows typically the light which advances along the indication direction reflective surface and rear end direction reflective surface in the hollow reflection part of FIG. (A) is a figure which shows typically the spreading | diffusion angle (alpha) 1 of the light after injecting into the permeation | transmission surface formed in planar shape, (b)-(d) is the convex from which the extent (curvature) becomes large sequentially. It is a figure which shows typically the divergence angles (alpha) 2-(alpha) 4 of the light after injecting into each transmission surface formed in this curved surface shape. It is a fragmentary sectional view which shows the structure of the modification of the self-light-emitting pointer | guide of FIG. It is a figure which shows the structure of the conventional pointer instrument and a self-light-emitting pointer. It is a figure for demonstrating the light reflected and permeate | transmitted by the hollow reflection part of the pointer main body of the self-light-emitting pointer | guide of FIG. It is a figure which shows typically the light which advances the hollow reflective part vicinity of FIG. It is a figure which shows the structure which provided the light-diffusion member in the hollow reflection part in the self-light-emitting pointer | guide of FIG.

  Hereinafter, a display device for a vehicle which is an embodiment of a pointer instrument according to the present invention will be described with reference to FIGS.

  In FIG. 1, a vehicle display device 1 is a speed meter that displays a vehicle speed, for example, and is a character provided with a scale and an index such as a number, a character, or a symbol on a surface 2 a (a surface visually recognized by a viewer). A driving device 4 having a plate 2, a self-luminous pointer (hereinafter also referred to as a pointer) 3 as a pointer unit disposed on the surface 2 a of the dial 2, and a pointer shaft 14 to which the pointer 3 is attached at the tip; A circuit board 5 provided with a circuit pattern, electronic parts, and the like and a driving device 4 fixed, a plurality of light sources 6 provided on the circuit board 5, and from the center of the circuit board 5 toward the edge of the dial 2. The case 7 having the tapered portion 7 a formed as described above, the back cover 8 covering the back side of the wiring board 5, and the front glass 9 are provided.

  The dial plate 2 is a member formed in a substantially disc shape made of, for example, a transparent or translucent synthetic resin such as polycarbonate. A light-shielding ink (not shown) is printed on the surface 2a of the dial plate 2 respectively. In addition, a light-shielding region and an indicator as a translucent design formed by removing the light-shielding ink along the shape of characters, scales, etc. (without printing the light-shielding ink) are provided. Each index is visually recognized by being illuminated from the back side of the dial 2 by a light source 6 described later.

  The pointer 3 is arranged on the surface 2a side of the dial plate 2, and indicates the measurement amount in cooperation with each of the indicators by indicating each indicator provided on the dial plate 2. As shown in FIG. 2, the pointer 3 is provided in the cover member 32 to balance the pointer 3 by providing a pointer main body 31 as a pointer member, a cover member 32 made of an opaque synthetic resin covering the pointer main body 31. And a balance member 39 to be adjusted.

  As shown in FIGS. 3A and 3B, the pointer main body 31 is integrally formed with a base portion 40 using a light-transmitting synthetic resin as a light-transmitting material such as polycarbonate resin or acrylic resin. And a pointer portion 50.

  The base 40 includes a cylindrical base main body 41 and a light receiving portion 42 provided in the vicinity of the upper end 41 a inside the base main body 41. The base body 41 is fixedly attached to the pointer shaft 14 coaxially by inserting and fitting the tip of the pointer shaft 14 to the lower end 41b. That is, the center of the base body 41 coincides with the axis P of the pointer shaft 14. The light receiving part 42 is formed in the same circular shape and plane as the inside of the base body 41, and is spaced from the end surface 14 a at the tip of the pointer shaft 14 when the pointer shaft 14 is fitted to the base body 41. Are placed relative to each other. Of course, the shape of the light receiving unit 42 is not limited to a planar shape, and may be any shape that can receive light from a light source, such as a curved surface shape or a shape in which a plurality of surfaces are combined. In addition, the light receiving unit 42 may be disposed in close contact with the end surface 14 a of the pointer shaft 14.

  The pointer portion 50 is connected to the upper end 41a of the base main body 41 (that is, one end of the base portion 40), and is perpendicular to the axis P from the upper end 41a with the axis center P of the pointer shaft 14 as a boundary (substantially perpendicular). The indicator 51 extended in one direction intersecting (including the indication direction S1), and the rear portion extended shorter than the indication unit 51 in the other direction opposite to the one direction (ie, the rear end direction S2). 52. That is, the pointer portion 50 extends from the upper end 41a of the base body 41 in the instruction direction S1 and the rear end direction S2. The instruction direction S1 and the rear end direction S2 coincide with (including substantially coincide with) the radial direction of the pointer shaft 14. The instruction direction S1 and the rear end direction S2 are also the longitudinal direction of the pointer portion 50. Further, the pointer portion 50 is provided with a hollow reflection portion 60 as a reflection portion.

  The bottom surface 54, which is the surface of the pointer portion 50 directed toward the base portion 40, is formed by being colored white or silver by a hot stamp or the like so as to reflect light incident on the bottom surface 54 from within the pointer portion 50. The reflective layer 54a is provided so as to overlap. In addition, a diffusion layer 53a formed in a red color or the like with a hot stamp or the like is formed on the upper surface 53 which is the surface of the pointer portion 50 opposite to the bottom surface 54 so as to diffuse light emitted from the upper surface 53. Overlaid. In addition, the reflection layer 54 a and the diffusion layer 53 a may be formed by forming a texture or a fine prism structure on the bottom surface 54 and the top surface 53. In the present embodiment, the reflective layer 54a is provided only on the bottom surface 54 on the indication unit 51 side. However, a similar reflective layer 54a may be provided on the bottom surface 54 on the rear portion 51 side. In the following description, the description “bottom surface 54” represents the surface of the pointer portion 50 including the reflective layer 54 a on the base 40 side, and the description “top surface 53” refers to the diffusion layer opposite to the bottom surface 54. It represents the surface of the pointer portion 50 including 53a, and the bottom surface 54 and the reflective layer 54a, and the top surface 53 and the diffusion layer 53a will be described separately only when necessary. Note that the reflective layer 54a and the diffusion layer 53a may be provided with only one of them.

  As shown in FIGS. 3A and 3B, the hollow reflecting portion 60 is provided in the pointer portion 50 near the upper end 41 a of the base body 41 so as to face the light receiving portion 42 of the base portion 40. The hollow reflection part 60 has a pointing direction reflection surface 61, a rear end direction reflection surface 62, and a transmission surface 63, and penetrates the pointer part 50 in the width direction (front-back direction in FIG. 3B). It is formed into a shape.

  The pointing direction reflecting surface 61 is formed in a substantially flat shape, and one end closer to the lower side in the drawing is disposed in the vicinity of the base 40, and from this one end toward the pointing direction S1 (left direction in FIG. 3B). Further, it is formed so as to be inclined so as to be gradually separated from the base portion 40 in the axis P direction of the pointer shaft 14 (upward direction in FIG. 3B). Thereby, the indication direction reflection surface 61 reflects a part L1 of the light L received by the light receiving unit 42 in the indication direction S1, and transmits another part L3 of the light L to the transmission surface 63 side.

  The rear end direction reflecting surface 62 is formed in a substantially flat shape, and one end is connected to the one end of the pointing direction reflecting surface 61, and the one end is directed to the rear end direction S2 (right direction in FIG. 3B). Accordingly, it is formed to be inclined so as to be gradually separated from the base portion 40 in the axis P direction of the pointer shaft 14 (upward direction in FIG. 3B). That is, the rear end direction reflection surface 62 is connected to intersect the indication direction reflection surface 61. Thereby, the rear end direction reflection surface 62 reflects a part L2 of the light L received by the light receiving unit 42 in the rear end direction S2, and transmits the other part L3 of the light L to the transmission surface 63 side. . Further, a corner portion 60 a formed by intersecting the indication direction reflection surface 61 and the rear end direction reflection surface 62 is disposed on the axis P of the pointer shaft 14 and toward the light receiving portion 42 of the base portion 40. . Of course, the arrangement of the corner portion 60a is not limited to the axis P of the pointer shaft 14, and may be shifted from the axis P toward the instruction direction S1 or the rear end direction S2.

  The transmission surface 63 is formed in a curved surface in which the cross-sectional shape along the longitudinal direction of the pointer portion 50 (that is, the pointing direction S1) is a smooth curved shape protruding in a direction away from the corner portion 60a. It is arranged to face the upper surface 53. That is, the transmission surface 63 is formed in a concave lens shape. The transmission surface 63 has one end connected to the other end near the upper side of the indication direction reflection surface 61 so as to cross the indication direction reflection surface 61, and the other end connected to the other end near the upper side of the rear direction reflection surface 62. The end-direction reflecting surface 62 is crossed and connected. In other words, the transmission surface 63 is formed as a convex curved surface from one end connected to the pointing direction reflection surface 61 to the upper surface 53 of the pointer portion 50 from the other end connected to the rear end direction reflection surface 62. The longitudinal center of the pointer portion 50 of the transmission surface 63 is disposed on the axis P of the pointer shaft 14. Of course, the shape of the transmission surface 63 is not limited to the concave lens shape, and the arrangement of the transmission surface 613 is not limited only to the case described above.

  The pointer main body 31 reflects and transmits the light received by the light receiving portion 42 of the base portion 40 through the hollow reflecting portion 60, guides the light in the pointer portion 50, and emits the light from the upper surface 53 of the pointer portion 50. Thereby, the upper surface 53 of the pointer portion 50 emits light, and the upper surface 53 is visually recognized through the slit 71 of the cover member 32.

  As shown in FIG. 2, the cover member 32 has an upper cover 33 and a lower cover 38 that are divided into upper and lower parts.

  The upper cover 33 includes a first cover portion 34 formed in a substantially rectangular tube shape that gradually decreases from the rear end 34b toward the tip end 34a in accordance with the outer shape of the pointer portion 50 of the pointer main body 31, and a base portion of the pointer main body 31. And a second cover part 35 formed in a circular dish shape covering the periphery of 40. The first cover portion 34 and the second cover portion 35 are opened downward in the figure, and the pointer portion 50 of the pointer main body 31 is accommodated inside from the opening.

  The upper wall 34c of the first cover part 34 is provided with a slit 71 extending from the rear end 34b to the front end 34a. The slit 71 is formed so that when the pointer main body 31 and the cover member 32 are assembled, the upper surface 53 of the pointer portion 50 of the pointer main body 31 is exposed in a straight line over the entire longitudinal direction thereof. That is, the slit 71 is formed along the longitudinal direction of the pointer portion 50. The length and width of the slit 71 can be arbitrarily designed according to the design of the pointer 3 and the like. Further, a translucent coloring member or a light diffusing member may be provided in the slit 71, and the slit 71 only needs to be configured so that light emitted from the upper surface of the pointer portion 50 passes therethrough. In addition, a pair of bosses (not shown) are formed on the inner surface of the second cover portion 35 so as to protrude downward in the figure and fit into the pair of fitting holes 38d of the lower cover 38. .

  The lower cover 38 includes a first lid 38 a having an annular plate shape formed in accordance with the opening shape of the second cover portion 35 of the upper cover 33, and the first cover 33 of the upper cover 33 that accommodates the instruction portion 51 of the pointer portion 50. A band-shaped second lid portion 38b extending in the radial direction from the first lid portion 38a, which is formed in accordance with the opening shape of the tip side portion of the one cover portion 34, and a pointer main body provided on the first lid portion 38a 31 through the base portion 40, a pair of fitting holes 38d provided in the first lid portion 38a corresponding to the pair of bosses of the upper cover 33, and a mounting boss to which the balance member 39 is attached. 38e. The lower cover 38 is assembled to the upper cover 33 to close the openings of the first cover portion 34 and the second cover portion 35, and forms a space for accommodating the pointer portion 50 of the pointer main body 31 together with the upper cover 33. And by accommodating the pointer part 50 of the pointer main body 31 in this accommodation space, it is possible to prevent the light emitted from the surface such as the bottom surface 54 of the pointer part 50 from illuminating the dial plate 2 or the like.

  The balance member 39 is formed with a weight set in consideration of the pointer portion 50 of the pointer main body 31, and has a fitting hole 39 a that is fitted to a mounting boss 38 e provided on the lower cover 38 of the cover member 32. Have. The balance member 39 is positioned by the mounting boss 38e and is accommodated in the cover member 32.

  The pointer 3 configured in this manner is assembled as follows, for example. First, the base 40 of the pointer main body 31 is passed through the through portion 38 c of the lower cover 38, the pointer main body 31 is set on the lower cover 38, and the balance member 39 is set on the lower cover 38. Then, the upper cover 33 is placed close to the pointer main body 31 so as to cover the pointer main body 31 from the upper surface 53 side of the pointer main body 31, and the pair of bosses and the lower cover 38 provided in the second cover of the upper cover 33 are covered. By fitting the pair of fitting holes 38d, the upper cover 33 and the lower cover 38 are fixed to each other, the pointer main body 31 is accommodated in the cover member 32, and the assembly is completed.

  The driving device 4 is a well-known stepping motor, and supports a pointer shaft 14 formed in a substantially cylindrical shape with a light-transmitting synthetic resin such as polycarbonate resin, and the pointer shaft 14 so as to be rotatable. A main body 15 that rotates the pointer shaft 14 according to the principle of a stepping motor in accordance with a speed measurement amount by a speed sensor that does not. A concave portion 15b is provided in a bottom surface 15a of a main body portion 15 disposed so as to overlap with a wiring board 5 described later, and an end surface 14b on the lower side of the pointer shaft 14 in the figure is exposed in the concave portion 15b. The base portion 40 of the pointer main body 31 described above is attached to the tip of the pointer shaft 14 at the upper side in the drawing. The pointer shaft 14 is configured to turn the pointer main body 31 and guide light to the base 40 as a light guide member.

  The wiring board 5 is a well-known printed circuit board provided with electronic components and wiring patterns for electrically connecting these electronic components. A driving device 4 and a plurality of light sources 6 are mounted on the surface of the wiring board 5 on the dial 2 side.

  The plurality of light sources 6 use LEDs, bulbs, and the like, and are controlled to be turned on and off by a control unit (not shown) provided on the wiring board 5. The plurality of light sources 6 emit light for causing the indicator of the dial 2 and the pointer main body 31 of the pointer 3 to emit light. One of the plurality of light sources 6 is disposed in the recess 15 b of the main body 15 of the driving device 4 so as to be opposed to the end surface 14 b of the pointer shaft 14. Thereby, the pointer shaft 14 guides the light incident on the end surface 14b from the light source 6 and emits the light from the end surface 14a at the tip.

  In the case 7, the tapered surface that is the surface of the tapered portion 7 a is a reflecting surface, and reflects the light emitted from the light source 6 toward the dial 2. Thereby, each index provided on the surface 2a of the dial 2 emits light. The back cover 8 is assembled to the case 7 so as to cover the back of the wiring board 5. The front glass 9 is disposed so as to cover the dial 2, the pointer 3 and the like, and is attached to the case 7 via a turn 10 by fixing means (not shown) such as a locking claw. The back cover 8 and the front glass 9 prevent dust and the like from entering the vehicle display device 1.

  Next, an example of the operation (action) of the pointer (self-luminous pointer) 3 according to the present invention having the above-described configuration will be described with reference to FIGS. In each figure, the arrow described in the pointer main body 31 schematically shows the traveling direction of the light guided to the pointer main body 31.

  In this embodiment, as shown in FIGS. 4 and 5, the hollow reflecting portion 60 provided in the pointer portion 50 of the pointer main body 31 includes a pointing direction reflecting surface 61, a rear end direction reflecting surface 62, and a transmitting surface 63. It is formed in a substantially fan shape.

  The pointing direction reflecting surface 61 reflects a part L1 of the light L received by the light receiving unit 42 in the pointing direction S1 (left direction in FIG. 5) and transmits another part L3 of the light to the transmitting surface 63 side. To penetrate. The rear end direction reflection surface 62 reflects a part L2 of the light L received by the light receiving unit 42 in the rear end direction S2 (right direction in FIG. 5) and transmits another part L3 of the light to the transmission surface. Transmits to the 63 side. The light L1 travels in the pointing portion 51 in the pointing direction S1 and is emitted from the location R1 on the upper surface 53 on the pointing portion 51 side, and the light L2 travels in the rear portion 52 in the trailing end direction S2. And the light L3 enters the transmission surface 63 and then exits from the location R3 on the upper surface 53 on the upper side of the hollow reflective portion 60. As a result, the entire upper surface 53 of the pointer portion 50 shines.

  As schematically shown in FIG. 6, in the vicinity of the hollow reflective portion 60, the light L part L 1 ′, L 2 ′ is directed directly from the light receiving portion 42 toward the upper surface 53, or the indication direction reflective surface 61, After being reflected by the rear-end-direction reflecting surface 62, it proceeds through the pointer portion 50 toward the upper surface 53. Further, the light component L3 ′ near the pointing direction reflection surface 61 and the light component L3 ″ near the rear end direction reflection surface 62 included in the light L3 pass through the hollow reflection portion 60 and pass through the transmission surface 63. Then, the light travels through the pointer portion 50 toward the upper surface 53.

  The transmission surface 63 is formed as a convex curved surface from one end connected to the pointing direction reflection surface 61 to the upper surface 53 of the pointer portion 50 from the other end connected to the rear end direction reflection surface 62. The incident angle of the light components L3 ′ and L3 ″ to the transmission surface 63 is adjusted, and the spread angle after the light L3 including the light components L3 ′ and L3 ″ is incident on the transmission surface 63 is adjusted. The light components L3 ′ and L3 ″ are refracted so as to be larger than the divergence angle when the transmission surface 63 is flat. Therefore, the divergence angle of the light L3 is adjusted by adjusting the shape of the transmission surface 63. Can be adjusted appropriately. Further, light components other than the light components L3 ′ and L3 ″ included in the light L3 are also refracted in the same manner. In FIG. 6, as an example, the case where the light components L3 ′ and L3 ″ are incident on the transmission surface 63 at a right angle (that is, with an incident angle of 0 degrees) is schematically illustrated. If the incident angle of each light component of the light L3 is smaller than when the transmission surface 63 is formed in a flat shape, the same effect as described above can be obtained.

  FIG. 7A schematically shows the divergence angle α1 at the transmission surface 63 formed in a flat shape, and FIGS. 7B to 7D are convex curved surfaces in which the extent of protrusion (curvature) increases in order. The spread angles α <b> 2 to α <b> 4 in each of the transmission surfaces 63 formed in a shape are schematically shown. In the figure, the alternate long and short dash line indicates a normal H at a point on the transmission surface 63 where the light components L3 ′ and L3 ″ are incident. In FIG. 7B, the normal H is the pointing direction reflection surface 61 and the rear surface. The normal line H is inclined inward from the end-direction reflecting surface 62. In FIG. 7C, the normal line H is parallel to the pointing-direction reflecting surface 61 and the rear-end direction reflecting surface 62, and in FIG. H is inclined outward from the pointing direction reflection surface 61 and the rear end direction reflection surface 62. Also, in FIGS. 7B to 7D, the planar transmission surface 63 and the light components L3 ′ and L3 ″ of FIG. 7A are indicated by dotted lines for comparison. 7A to 7D, the spread angles have a relationship of α1 <α2 <α3 <α4.

  Therefore, by adjusting the shape of the transmission surface 63 and adjusting the spread angle of the light L3, a location (that is, the location R1 and location) located on the extension of the pointing direction reflection surface 61 on the upper surface 53 of the pointer portion 50. The amount of light emitted from (in between R3) can be prevented from decreasing, and the position of the upper surface 53 of the pointer portion 50 on the extension of the rear-end-direction reflecting surface 62 (that is, between the position R2 and the position R3). In the same manner, it is possible to prevent a decrease in the amount of light. 4 and 5, for convenience of explanation, there are gaps between the locations R1 and R3, and between the locations R2 and R3, but in reality these intervals do not occur. In other words, no dark portion is generated on the upper surface 53 of the pointer portion 50.

  As described above, according to the present invention, the hollow reflecting portion 60 provided in the pointer portion 50 of the pointer main body 31 includes the pointing direction reflecting surface 61, the rear end direction reflecting surface 62, and the transmitting surface 63. 63 is formed as a curved surface that protrudes from the one end connected to the pointing direction reflecting surface 61 to the upper surface of the pointer portion 50 from the other end connected to the rear end direction reflecting surface 62. The incident angle of the light L3 transmitted through each of the rear-end-direction reflecting surfaces 62 to the transmitting surface 63 is adjusted, and the spread angle of the light L3 after entering the transmitting surface 63 is flat. The light L3 is refracted so as to be larger than the divergence angle in the case of being formed, and accordingly, by adjusting the shape of the transmission surface 63 to make the divergence angle of the light appropriate, the pointer portion 50 The pointing direction reflecting surface 61 on the upper surface 53 of It is possible to prevent the occurrence of a dark portion at a location near located on the extension of the micro-rear direction reflecting surface 62, without providing a light diffusion member or the like, it is possible to prevent luminance unevenness on the upper surface 53 of the guide portion 50 at low cost.

  Further, since the cross-sectional shape of the transmission surface 63 along the indication direction S1 is formed in a smooth curved shape convex toward the upper surface 53 of the pointer portion 50, the transmission surface 63 becomes a concave lens-shaped curved surface. The spread light spreads in the longitudinal direction of the pointer part 50 without unevenness, and therefore, uneven brightness on the upper surface 53 of the pointer part 50 can be further prevented.

  In the present embodiment, an expression indicating directions such as upper, lower, left, right, front, rear, etc. used for explaining the configuration and operation of each part of the display device 1 for the vehicle, the self-light emitting pointer 3 and the pointer main body 31. Is relative rather than absolute, and is appropriate when the vehicle display device 1, the self-luminous pointer 3 and the pointer body 31 or parts thereof are in the posture shown in the figure. Should change and be interpreted according to the change in posture.

  Further, the shape of the hollow reflecting portion 60 is not limited to the above-described substantially fan shape, and as long as it is formed in the pointer portion in a hollow shape, its shape is not contrary to the object of the present invention. Is optional. In addition, the shapes of the indication direction reflection surface 61, the rear end direction reflection surface 62, and the transmission surface 63 are not limited to the above-described configuration, and in particular, the transmission surface 63 is one end connected to the indication direction reflection surface 61. As long as it is formed into a convex curved surface toward the upper surface 53 of the pointer part 50 from the other end connected to the rear end direction reflecting surface 62, the shape thereof is arbitrary as long as it is not contrary to the object of the present invention. is there. In the present specification, the “convex curved surface” includes not only a smooth curved surface but also a curved surface formed by combining a flat surface, a curved surface and an aspherical surface. In addition, the indication direction reflection surface 61 and the rear end direction reflection surface 62 are formed in a substantially flat surface, but the present invention is not limited to this, and each of these surfaces is a flat surface, a curved surface, an aspheric surface, or a composite surface thereof. Or it may be comprised by several surfaces, and the shape is arbitrary unless it is contrary to the objective of this invention.

  In the present embodiment, the base 40 includes a base body 41 attached to the pointer shaft 14 and a light receiving portion 42 that receives the light of the light source 6 guided to the pointer shaft 14. However, the present invention is not limited to this. For example, as shown in FIG. 8, the lower cover 38 is provided with a cylindrical bearing portion 38f that is attached to the pointer shaft 14 in place of the base portion main body 41, and the base portion 40 of the pointer main body 31 is formed only by the light receiving portion 42. As long as the base portion of the pointer main body (pointer member) includes at least a light receiving portion that receives light from the light source, the configuration thereof is arbitrary.

  In the present embodiment, the display device for a vehicle as a speed meter has been described. However, the present invention is not limited to this. For example, the present invention is applied to an engine tachometer, a fuel gauge, and the like in addition to the speed meter. Or may be used for industrial instrument devices other than display devices for vehicles such as instruments used for measuring gas pressure, temperature, etc. in factories, etc. Uses and application devices are arbitrary.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Vehicle display device (pointer instrument)
3 Self-luminous pointer (pointer unit)
4 Driving device 6 Light source 14 Pointer shaft 31 Pointer body (pointer member)
32 Cover member 40 Base 41 Base body 41a Upper end of base body (one end of base)
42 Light-receiving part 50 Pointer part 51 Pointer part 52 Rear part 53 Upper surface of pointer part 54 Bottom surface of pointer part 60 Hollow reflecting part 61 Pointing direction reflecting surface 62 Rear end direction reflecting surface 63 Transmitting surface 60a Pointing direction reflecting surface and rear end direction Corners formed by intersecting reflecting surfaces S1 Indicating direction S2 Rear end direction

Claims (3)

A base that receives light from a light source; a pointer portion that extends from one end of the base in a pointing direction and a rear end direction that is opposite to the pointing direction; and light that is received by the base in the pointing direction and the In a pointer member made of a translucent material having a hollow reflecting portion provided in the pointer portion so as to be reflected in the rear end direction and facing the base portion,
The hollow reflector is
A pointing direction reflecting surface formed so as to reflect a part of the light received by the base in the pointing direction and transmit another part of the light;
Rear end direction reflection formed so as to cross the indication direction reflection surface and to be configured to reflect a part of the light received at the base part toward the rear end and to transmit the other part of the light. Surface,
A transmission surface that is crossed and connected to each of the indication direction reflection surface and the rear end direction reflection surface, and is disposed to face the upper surface of the pointer portion;
The transmission surface is formed as a convex curved surface from one end connected to the pointing direction reflection surface to the upper surface of the pointer part from the other end connected to the rear end direction reflection surface. Pointer member.   The pointer member according to claim 1, and a cover member provided with a slit that covers the pointer portion of the pointer member and that allows light from the upper surface of the pointer portion to face the side opposite to the base side. A pointer unit characterized by having.   The pointer unit according to claim 2, a drive device that rotates a pointer shaft to which the pointer unit is attached according to a measurement amount, and a light source that emits light received by a pointer member of the pointer unit. A pointer instrument characterized by that.

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