JP5824267B2 - Meter device - Google Patents

Description

  The present invention relates to a meter device that can be used as an instrument for various vehicles such as an automobile instrument, a ship instrument, and an aircraft instrument.

  2. Description of the Related Art Various types of meter devices have been proposed and developed for use in various instruments (see, for example, Patent Documents 1 to 3).

  As shown in FIG. 7, the meter device 100 of Patent Document 1 has a light-transmitting display plate 101 having an indicator described therein and a pointer 102 so that the light from the light source can be used efficiently. A pointer member 103 for instructing, a light source 104 for illumination, a light guide member 105 for guiding irradiation light from the light source 104 to the pointer 102 and the index, and light emitted from the light guide member 105 from the back surface to the display plate 101 And a reflecting plate 106 to be incident. In addition, the light guide member 105 includes a cylindrical portion 105 </ b> A that guides irradiation light from the light source 104 to the pointer 102 and a bent portion 105 </ b> B that guides the reflecting plate 106.

  In the meter device 100, the pointer shaft 107 of the pointer member 103 is inserted into the cylindrical portion 105A, and the light source 104 is disposed to face the lower end surface 105C and the light receiving surface 105D, and incident light from the lower end surface 105C is guided by the pointer. The light is emitted from the upper end surface 105 </ b> E that is opposed to 102. Further, the light guide member 105 has a bent portion 105B extending from the outer peripheral surface of the cylindrical portion 105A to the outer edge side of the display plate 101, and receives incident light from the light receiving surface 105D arranged side by side with the lower end surface 105C. The light is emitted from the light exit surface 105F of the bent portion 105B provided on the outer edge side of 101. Note that Patent Document 2 has the same configuration and has the same function.

  On the other hand, as shown in FIG. 8, the meter device 200 of Patent Document 3 includes a first indicating mechanism 220 that indicates a speed that is a first measurement value based on a rotation angle of the pointer 201, and a rotation center 201 </ b> A of the pointer 201. A pointing device 210 including a second indicating mechanism 230 that indicates the engine speed, which is a second measurement value, by a color development area 203 that extends in the radial direction from the lighting device 202 and an illuminating unit 202 is provided.

  Among these, the second instruction mechanism 230 is configured such that the coloring axis 204 that moves up and down on the rotation axis 206 of the pointer 201 in accordance with the second measurement value and the coloring at the tip of the coloring axis 204 is the rotation center 201A of the pointer 201. And a light guide means 205 having an inverted trapezoidal cross section for projecting to a position spaced from the center to form a color development region 203. Then, the illumination light from the illumination unit 202 is guided to the color development area 203 of the light guide means 205 via the rotation axis 206 and the color development axis 204 of the intrinsic color, and coloring of the color development area 203 is performed at night or the like. Lighting with stable color that is easy to see.

JP 2010-1112933 A JP 2010-48743 A JP 2010-101734 A

  By the way, according to the meter device 100 described in Patent Document 1 shown in FIG. 7, the light guide member 105 is configured to send a lot of illumination light from the light source 104 to the upper pointer member 103. . In addition, the light guide member 105 is configured to send part of the illumination light from the light source 104 to the reflector 106 at the same time. However, according to the light guide member 105, the illumination light is sent to the reflection plate 106 exclusively to the peripheral portion thereof, and it is difficult to send the light closer to the center portion. This situation is the same in Patent Document 2.

  On the other hand, in the meter device 200 described in Patent Document 3 shown in FIG. 8, most of the illumination light from the light source 202 is guided to the upper pointer 201 via the rotation shaft 206 and irradiated. A part of the illumination light propagating through the light is sent from the coloring axis 204 to the light guide means 205. As described above, also in the meter device 200, a part of the illumination light is guided to the light guide unit 205 and the light guide unit 205 is illuminated simultaneously with the pointer 201, but the incident area to the light guide unit 205 is one. Only the partial region S is used, and the entire surface of the light guide unit 205 is not illuminated.

  Therefore, although all of those described in the patent documents are configured such that a part of the illumination light is sent to the reflecting plate and the light guide means, the illumination to them is unevenly distributed in some areas. It is an illumination mode and does not have a structure capable of performing uniform illumination.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a meter device capable of performing uniform illumination from the back side of the dial simultaneously with illumination in the direction of the pointer. There is.

In order to achieve the above-described object, the meter device according to the present invention is characterized by the following (1) to (4).
(1) A movement having a rotating shaft on which light emitted from a light source is incident, a motor that rotates the rotating shaft, and a movement case that houses the rotating shaft and the motor inside,
Dial with various marks,
A reflection part in the case of the instrument in which the movement is arranged in a concavely curved depression located on the back surface of the dial,
A state in which a part of the light from the light source that has been propagated through the rotation shaft is diffused toward the movement case outer surface of the movement or the reflection part in the case. a light guide member for refraction in,
A pointer main body indicating a mark on the dial, and a base end side of the pointer main body that is suspended from the base of the pointer main body toward the dial is inserted into the shaft hole of the dial in a rotatable state and the light guide member A pointer shaft that can be connected to the tip end side of the rotary shaft via
On the back side of the dial, a light-shielding member that is attached to the proximal end of the pointer shaft and prevents light emitted from the light guide member from leaking to the outside from the shaft hole of the dial ,
Be provided.
( 2 ) In the meter device configured as described in ( 1 ) above,
The light guide member and the light shielding member constitute means for connecting the pointer shaft and the rotation shaft,
about.
( 3 ) In the meter device configured as described in ( 2 ) above,
The light guide member includes an upper hole into which the tip end of the pointer shaft is press-fitted as means for connecting the pointer shaft, and a pilot hole into which the tip end of the rotary shaft is press-fitted as means for connecting the rotary shaft. And
The upper hole has a convex lens shape in which a floor surface bulges, and a lower inner peripheral surface extending from the floor surface expands upward,
The pilot hole has a convex lens shape in which a ceiling surface bulges, and an upper inner peripheral surface extending from the ceiling surface expands downward.
about.
( 4 ) In the meter device having any one of the above ( 1 ) to ( 3 ),
A light transmission suppressing member that suppresses transmission of light from the inside of the pointer shaft to the outside is provided in a portion of the outer peripheral surface of the pointer shaft that is located closer to the dial than the light shielding member. Yes,
about.

According to the meter device having the above configuration (1), it is possible to guide the illumination light in a state of being dispersed toward the movement case outer surface of the movement and the reflection part in the case by the refraction action of the light guide member. It becomes. As a result, the dial can be uniformly illuminated using the reflected light from the outer surface of the movement case and the reflected light from the reflection part in the case. In other words, it is possible to perform uniform illumination from the back of the dial simultaneously with illumination in the direction of the pointer.
Further, it is not necessary to put a large cap on the tip exposed from the dial of the pointer shaft. In other words, even with a small cap, light leakage from the shaft hole through which the pointer shaft of the dial penetrates can be suppressed as much as possible. Thereby, the meter apparatus with favorable design property is realizable.
According to the meter device having the above configuration ( 2 ), it is not necessary to provide a dedicated connecting means between the pointer shaft and the rotating shaft, so that the cost can be reduced.
According to the meter device having the above configuration ( 3 ), a certain amount of light can be secured in the direction of the pointer shaft. Further, it is possible to promote the propagation of the illumination light toward the movement case outer surface of the movement or the reflection part within the case.
According to the meter device having the above configuration ( 4 ), since the leakage of illumination light from the outer peripheral surface of the pointer shaft is suppressed by the light transmission suppressing member, light leaks from the back side of the dial through the shaft hole. Can also be avoided. Furthermore, it is no longer necessary to put a large cap on the tip exposed from the dial of the pointer shaft, and even with a small cap, light leakage from the shaft hole through which the pointer shaft of the dial penetrates can be suppressed as much as possible. . As a result, a design-display meter device with good design can be provided.

  According to the meter device of the present invention, it is possible to guide the illumination light in a state of being dispersed toward the movement case outer surface of the movement and the reflection part in the case by the refracting action of the light guide member. As a result, the dial can be uniformly illuminated using the reflected light from the outer surface of the movement case and the reflected light from the reflection part in the case. In other words, it is possible to realize a meter device capable of performing uniform and effective illumination on the dial simultaneously with illumination in the direction of the pointer.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

It is a top view which shows the meter apparatus which concerns on embodiment of this invention. It is arrow sectional drawing in the II-II line | wire of FIG. It is sectional drawing which shows the pointer | guide main part of the meter apparatus shown in FIG. It is a perspective view which shows the prism which comprises the light guide member of the meter apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the optical path of the illumination light in the principal part of the prism of FIG. It is a perspective view which shows the light-shielding member of the meter apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the conventional meter apparatus. It is sectional drawing which shows the principal part of the other conventional meter apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a meter device 1 according to an embodiment of the present invention.

  The meter device 1 includes a light source 3 mounted on a substrate 2, a movement 4 attached at a predetermined location on the substrate 2 including a region where the light source 3 is mounted, and a numeral installed on the top of the movement 4. , Letters, symbols, etc., a dial 5 for indicating necessary information regarding the car itself or the environment around the car, a pointer 6 for indicating numbers, letters, symbols, etc. of the dial 5, and a light guide member (to be described in detail later) , Called “prism”) 7 and a light shielding member 8. In FIG. 1, reference numeral 11 denotes a display unit using an LCD (Liquid Crystal Display) that digitally displays a trip meter, an odometer, etc., reference numeral 10 denotes a case in which these members are accommodated, and reference numeral 12 denotes a display board. Show. Further, in FIG. 2, reference numeral 13 denotes an in-case reflecting portion located inside the instrument case 10, and the surface of the in-case reflecting portion 13 is effectively reflected without absorbing illumination light. It is formed of an appropriate material with enhanced glossiness.

  The light source 3 is composed of, for example, an LED (Light Emitting Diode) that emits visible light having a predetermined wavelength (λ), and is an end face on the lower side of the rotating shaft 41 (hereinafter referred to as “base end face”). It is mounted on the substrate 2 directly below in a state of facing. The LED which is the light source 3 of the present embodiment has an optical axis set in the Z direction perpendicular to the upper surface of the substrate 2, and most of the light from this LED (hereinafter referred to as “illumination light”). Things are emitted toward the base end face of the rotation shaft 41 directly above.

  The movement 4 accommodates movement parts such as a step motor M, a reduction gear train G, and a rotating shaft 41 in a movement case 40 of the movement shown in FIG. The upper surface 4A side of the movement case 40 is guided to the dial plate 5 or the reflection part 13 in the case by reflecting the refracted illumination light by a prism 7 described later, and finally illuminates the dial plate 5 uniformly. As it goes to the outer periphery, a slope inclined downward toward the in-case reflection portion 13 is presented. For this reason, the movement case 40 is formed of an appropriate material that effectively reflects the illumination light without being absorbed.

  The step motor M is for rotating the rotary shaft 41 and further the pointer 6 and rotates the rotary shaft 41 while decelerating via the reduction gear train G, that is, the intermediate gear G1 and the output gear G2. By rotating the rotary shaft 41, the pointer 6 integrated therewith is rotated along the surface of the dial plate 5 to indicate various necessary information. As shown in FIG. 2, the step motor M of the present embodiment includes a stator M1 and a rotor M2 including a rotor shaft that is installed at the opened central portion of the stator M1. In addition, the structure which decelerates with the single gear instead of the above reduction gear trains G may be sufficient.

  The output gear G2 is formed integrally with the rotary shaft 41 in the vicinity of the intermediate portion of the rotary shaft 41. For example, the output gear G2 of the present embodiment is integrally formed with the rotary shaft 41 having a light guiding function by using an appropriate transparent resin material. In the present embodiment, the output gear G2 and the rotary shaft 41 are integrally formed as described above. However, the output gear G2 and the rotary shaft 41 are formed as separate bodies, and then the rotary shaft 41 is passed through and fixed to the output gear G2. A configuration may be adopted.

  The rotating shaft 41 is formed integrally with the output gear G2 from an appropriate light-transmitting (or light-guiding) resin material having excellent light guiding properties, and transmits the rotational force from the step motor M to the pointer shaft 61. In addition, the illumination light from the light source 3 is propagated to the pointer shaft 61. Specifically, the rotary shaft 41 is provided so as to protrude upward and downward from the center of the disk-shaped gear body of the output gear G2. And, the upper axis of the rotation shaft 41 extending vertically upward with respect to the gear body, the lower axis of the rotation shaft 41 extending vertically downward with respect to the gear body, and the gear axis of the gear body are all Located on the same straight line. The rotating shaft 41 has a substantially cylindrical shape in order to effectively guide the illumination light from the light source 3 to the pointer 6.

  In order to secure a required light amount, the rotating shaft 41 has an outer diameter that is larger than that of the rotating shaft that does not have a light guide function, in particular, an outer diameter on the lower side of the attachment portion with the output gear G2. Thus, since the outer diameter dimension of the lower side of the rotating shaft 41 is made larger, the light receiving efficiency with respect to the illumination light from the light source 3 is higher than that of the small diameter dimension. In particular, the rotating shaft 41 of the present embodiment is configured such that the outer diameter dimension on the lower side is the same as that on the upper side. Therefore, unlike the structure in which the diameter is reduced from a large diameter to a small diameter in a part between the upper side and the lower side, the illumination light guided through the rotary shaft 41 leaks in the reduced diameter part. Such a phenomenon can be avoided, so that the light guide efficiency is also increased.

  The rotating shaft 41 protrudes outward from the upper outer surface of the movement case 40, that is, the upper surface 4A, and the upper side, which is the protruding distal end side, is an end portion of a pointer shaft 61 described later (this is referred to as a “base end”). ) And the prism 7 and the light shielding member 8. Further, the rotating shaft 41 is pivotally supported on the shaft hole 40 </ b> A of the movement case 40 on the distal end side, and is rotatably supported on a shaft hole 40 </ b> B serving as a bearing provided on the movement case 40.

  As described above, the rotating shaft 41 is directly opposed with the base end face installed immediately above the light source 3. Therefore, when the illumination light from the light source 3 is incident on the base end surface, most of the illumination light is reflected at the interface with the outer peripheral surface of the rotating shaft 41, for example, is guided while repeating total reflection or regular reflection. Then, it is propagated upward, which is the tip.

  In the case of this embodiment, the dial device 5 is fitted over the entire surface of the speedometer. Further, the dial 5 is provided with holes for installing various instruments including the movement 4 and various display windows. Further, the dial 5 is covered at its upper part with a transparent front glass (not shown). The surface glass is not limited to being colorless and transparent, but may be any transparent material such as a black transparent material or a so-called smoked glass on which a smoke film is stretched.

  In the case of this embodiment, the meter device 1 including the movement 4 constitutes a speedometer as described above. In this speedometer, based on a sensor signal corresponding to a current speed detected by a sensor (not shown), a later-described pointer 6 is rotated by a predetermined angle, and a specific number formed on the dial 5 is pointed to indicate the current speed. Is displayed in analog.

  In the present embodiment, the dial 5 displays necessary information regarding the vehicle itself or the environment around the vehicle in a proper place. The dial plate 5 is provided with a shaft hole 50 through which the pointer shaft 61 of the pointer 6 passes in the center.

  As described above, the pointer 6 has the light transmitting pendulum shaft 61 suspended from the base 63 of the pointer main body 62 so that the illumination light propagating through the rotary shaft 41 is incident and propagated to the pointer main body 62. Yes. The pointer shaft 61 is integrally connected to the rotary shaft 41 via a prism 7 and a light shielding member 8 described later. The pointer 6 includes the cap 9 described above that covers the base 63 that is directly above the pointer shaft 61.

  Further, as shown in FIG. 3, illumination light propagating through the pointer shaft 61 toward the base 63 of the pointer main body 62 leaks from the outer peripheral surface of the pointer shaft 61 to the outside on the outer peripheral surface of the pointer shaft 61. In order to suppress this, a light transmission suppressing member (hereinafter referred to as a suppressing member) 60 is formed. The suppression member 60 is made of an appropriate reflective film or the like, and the portion where the suppression member 60 is formed should be at least the outer peripheral surface ahead of the light shielding member 8, that is, near the tip of the pointer shaft 61. That's fine.

  The prism 7 is integrally assembled on the distal end side of the rotation shaft 41. The prism 7 receives illumination light propagating through the rotation shaft 41. Of the illumination light incident on the prism 7, the illumination light other than the illumination light directly above along the axial direction is refracted downward. Accordingly, the dial 5 is directly incident on the back surface, or after being reflected by the reflection part 13 in the case and incident on the back surface of the dial plate 5, so that the dial plate 5 is uniformly illuminated. Therefore, the prism 7 is formed in a shape as shown in FIG. 4 using an appropriate transparent material, and has a unique substantially disk shape with a thickness decreasing toward the outer periphery.

  Specifically, the prism 7 has a pilot hole 71 into which the tip of the rotating shaft 41 is press-fitted in the center part of the lower surface, and an upper hole 72 into which a bearing part 81 (to be described later) of the light shielding member 8 is press-fitted in the central part of the upper surface. Have. By installing such a prism 7, the illumination light from the single light source 3 can be used as the illumination of the dial plate 5 together with the illumination of the pointer 6, so that the meter device 1 can be reduced in size and cost. Figured. Here, a structure in which the rotating shaft 41 and the prism 7 are separated will be described. However, the prism 7 and the rotating shaft 41 may be integrally formed. At that time, the shape of the movement case 40 is appropriately changed. In addition, here, a structure in which a later-described bearing portion 81 of the light shielding member 8 is press-fitted into the upper hole 72 will be described. However, a pointer shaft 61 penetrating a later-described through-hole 80 shaft is press-fitted into the upper hole 72. There may be.

  As shown in FIG. 5, the lower hole 71 has a convex lens shape in which the ceiling surface 71A bulges toward the lower hole 71, and the upper inner peripheral surface 71B of the lower hole 71 extending from the ceiling surface 71A is downward. An inclined surface that expands and curves in a concave shape is formed. As a result, the illumination light incident on the ceiling surface 71A among the illumination light transmitted through the rotation shaft 41 is deflected in the vertical (Z) direction along the central axis of the prism 7, so that the direction of the pointer shaft 61 Ensure a certain amount of light.

  On the other hand, the illumination light incident on the upper inner peripheral surface 71B out of the illumination light transmitted through the rotary shaft 41 is diffused outwardly, thereby allowing the case upper surface 4A of the movement 4 to be described later or the case internal reflection portion 13 to be diffused. Head towards the bottom.

  As shown in FIG. 5, the upper hole 72 also has a convex lens shape in which the floor surface 72A bulges, and a lower inner peripheral surface 72B extending from the floor surface 72A expands upward and is inclined to be convex. A surface is formed. As described above, the prism 7 has a convex lens shape in the portion sandwiched between the ceiling surface 71A and the floor surface 72A by both the ceiling surface 71A and the floor surface 72A. Thereby, by deflecting the illumination light in the vertical (Z) direction along the central axis of the prism 7, a certain amount of light can be secured in the direction of the pointer shaft 61. The upper inner peripheral surface 71B refracts the illumination light incident on the upper inner peripheral surface 71B and directs it toward the lower inner peripheral surface 72B. The lower inner peripheral surface 72B is the case upper surface 4A of the movement 4 or the in-case reflecting portion. Turn to 13. Thereby, propagation of the illumination light toward the case upper surface 4 </ b> A of the movement 4 or the in-case reflection part 13 can be promoted.

  In particular, the prism 7 has a lower surface 73 side at the outer edge portion so that a part of the illumination light from the light source 3 propagating in the rotating shaft 41 is refracted in the direction opposite to the dial plate 5. It is inclined upward in the direction and has a concave curved shape. Further, the upper surface 74 of the prism 7 has a shape that bulges in a convex shape slightly inclined downward toward the outer edge.

  Thus, the lower surface 73 of the prism 7 forms a slope inclined obliquely upward. Accordingly, the lower surface 73 reflects the illumination light that is incident on the prism 7 from the front end surface of the rotation shaft 41 or the outer peripheral surface on the front end side and then goes outward from the upper side without directing upward, or reflects the case upper surface 4A of the movement 4 or in the case. The light is refracted in the state of diffusion toward the vicinity of the bottom of the portion 13.

  On the other hand, the upper surface 74 of the prism 7 also constitutes a slope inclined obliquely downward, so that among the illumination light traveling inside the prism 7, the illumination light reflected at the interface with air in the upper surface 74 is The light path after the reflection is diffused as much as possible.

  Unlike the lower surface 73, the upper surface 74 is illumination light that travels near the center of the illumination light that travels inside the prism 7, and then refracts without being reflected by the upper surface 74 and exits from the prism 7. The illumination light to be refracted is directly refracted as much as possible and directed toward the light shielding member 8. For this reason, the upper surface 74 of the prism 7 is formed in a shape slightly slanted compared to the lower surface 73.

  The light shielding member 8 prevents a part of the illumination light refracted by the prism 7 and traveling in various directions from leaking outside the dial plate 5 through the shaft hole 50 of the display plate 5. The presence of the light shielding member 8 can prevent light from leaking to the outside of the dial plate 5 through the shaft hole 50 of the display plate 5, so that it is not necessary to cover the base 63 of the pointer 6 with a large outer diameter. It is like that.

  As shown in FIG. 6, the light shielding member 8 of the present embodiment is formed in a substantially umbrella shape using an appropriate opaque material. The light shielding member 8 basically needs to be configured to absorb or reflect at least light having a wavelength serving as illumination light. Preferably, the light shielding member 8 has light having a wavelength in the visible light region, that is, approximately from 380 nm. A structure that absorbs or scatters all light in the wavelength band of 760 nm is preferable.

  The light shielding member 8 of the present embodiment has at least an upper surface portion facing the dial plate 5 formed or colored in a similar color to the dial plate 5. The light shielding member 8 is located on the back side of the dial 5 having transparency or translucency. However, the light shielding member 8 is formed or colored with the same color as the dial 5 so that the dial 5 is Even if it transmits light, the light blocking member 8 is prevented from being seen through from the upper surface side of the dial plate 5.

  The light shielding member 8 has a structure that can be attached to a part of the proximal end side of the pointer shaft 61. In the present embodiment, the light shielding member 8 is formed so as to penetrate the bearing portions 81 and 82 projecting from the central portion of the lower and upper surfaces. The through hole 80 is assembled integrally.

Next, the operation of this embodiment will be described.
The illumination light emitted from the light source 3 is incident from the base end surface of the rotating shaft 41, guided to the distal end surface of the rotating shaft 41 protruding from the upper surface 4A of the movement case 40, and then enters the prism 7 and enters the inside thereof. proceed. After that, the illumination light emitted mainly from the vicinity of the central portion of the upper surface 74 in the prism 7 to the outside of the illumination light is incident on the pointer shaft 61 from the base end surface and proceeds upward in the interior. In this way, the illumination light propagating through the pointer shaft 61 is subsequently emitted from the pointer main body 62, so that the pointer 6 is illuminated.

  In this way, among the illumination light that enters the prism 7 and travels inside, the illumination light traveling near the center of the prism 7 is transmitted as much as possible without being reflected by the upper surface 74, and directly above. Toward the pointer shaft 61. In particular, the illumination light can be condensed in the axial direction of the prism 7 on the floor surface 72A having a convex lens function. As a result, it is possible to secure a certain amount of incident light quantity with respect to the pointer shaft 61 and to emit light with a sufficient light quantity from the pointer main body 62 correspondingly.

  In the present embodiment, the upper surface 74 of the prism 7 has a slope that is gently inclined obliquely downward. For this reason, among the illumination light traveling inside the prism 7, in particular, for the illumination light that travels outside the central portion of the prism 7 and is reflected by the upper surface 74 in the prism 7, the optical path is slightly converged but is almost uniform. Can be deflected so that

  Further, the lower surface 73 of the prism 7 has a shape inclined obliquely upward. For this reason, most of the illumination light that is refracted by the lower surface 73 after being reflected by the upper surface 74 in the prism 7 and travels outward is located inside the upper surface 4A of the movement case 40 or the inside of the instrument case 10 after the refraction. It progresses in a state of being diffused almost uniformly toward any of the in-case reflection portions 13.

  In addition, the illumination light traveling toward the upper surface 4A of the movement case 40 or the in-case reflection portion 13 is configured so that the illumination light is not absorbed by those surfaces. Eventually, the dial 5 can be transmitted upward from the back surface. Thereby, even if it is the illumination light by the single light source 3, illumination of both the pointer | guide 6 and the dial 5 is attained. In particular, the dial 5 can be uniformly illuminated indirectly from the back.

  As described above, the illumination light from one light source 3 is partially refracted outward by using the prism 7 configured as in the present embodiment, and only in the vicinity of the central portion of the reflection part 13 in the case. The illumination light can be diffused evenly and evenly near the outer edge.

  Such light emission illumination with the pointer 6 is performed in exactly the same way regardless of the direction in which the pointer 6 is rotating, even if the pointer 6 is stopped rotating. That is, the propagation operation when the illumination light from the light source 3 propagates to the rotation shaft 41, the prism 7, the pointer shaft 61, and the pointer main body 62 (these are referred to as rotating members here) is the rotation operation. While the member is rotating, the same operation is performed regardless of the rotation angular velocity or the rotation position of the rotation member. On the other hand, the light emission illumination for the dial plate 5 is performed without change regardless of the turning operation of the pointer 6. As a result, the pointer 6 and the dial 5 are illuminated and illuminated in the same uniform state.

  Further, according to the present embodiment, when the illumination light from the light source 3 leaks from, for example, the outer peripheral surface of the rotating shaft 41, even if the leaked illumination light tries to go upward (Z), the prism 7 Incident light is mostly absorbed or reflected by the light shielding member 8. Therefore, the illumination light leaking from the narrow shaft hole 50 of the dial plate 5 to the outside of the dial plate 5 through the gap between the light shielding member 8 and the back surface of the dial plate 5 can be almost suppressed. In particular, in this embodiment, since the shaft hole 50 is formed to have a minimum required inner diameter, light leakage can be further avoided.

  The same applies to the illumination light refracted from the prism 7 in the upward (Z) direction, and light leakage from the shaft hole 50 of the dial plate 5 can be avoided by the light shielding member 8. Further, a suppressing member 60 shown in FIG. 3 is formed on the outer peripheral surface of the pointer shaft 61. Accordingly, it is possible to avoid the inconvenience that light leaks to the outside from the outer peripheral surface of the pointer shaft 61 and goes upward (Z) and leaks from the shaft hole 50 of the dial plate 5 to the outside of the dial plate 5. As a result, according to the present embodiment, light leakage from the shaft hole 50 through which the pointer shaft 61 of the dial plate 5 penetrates can be suppressed as much as possible. Therefore, the cap 9 is configured as shown in FIG. The length L on the short diameter side is slightly larger than the inner diameter D having the minimum required size of the shaft hole 50, and can be formed much smaller than the conventional one.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention.

  For example, the light-shielding member 8 of the present invention has a structure that can be attached to a part of the proximal end side of the pointer shaft 61. In the present embodiment, the light-shielding member 8 is inserted into the through-hole 80 formed in the central portion. Are integrally assembled in the inserted state, but not particularly limited thereto. For example, the light shielding member 8 may be integrally assembled on the back surface which is the inner surface of the dial 5. In that case, the light shielding member 8 can be fixed to the back surface of the dial 5 in a state where the through hole 80 having a bearing for supporting the pointer shaft 61 at the center is aligned with the shaft hole 50 of the dial 5. That's fine.

  In the present embodiment, the light shielding member 8 is formed in the same color as the dial 5, but is not particularly limited to this configuration. That is, as shown in FIG. 2, a similar color blindfold member 14 having the same shape as or larger than the dial plate 5 is fixed to the case 10 directly above the light shielding member 8 and on the back surface of the dial plate 5. In this case, the light shielding member 8 may be formed of a light shielding material of any color.

  In this case, since the light shielding member 8 can form the outer surface including the upper surface in any appropriate color that absorbs the illumination light from the light source 3, the light shielding member 8 emits the illumination light regardless of the color. What is necessary is just to be able to absorb, and the freedom degree of selection of material increases. On the other hand, the portion directly above the light shielding member 8 on the back side of the dial plate 5 has the same shape as the light shielding member 8 or a larger shape, and transmits only light having a wavelength similar to that of the dial plate 5. A blindfold member 14 that absorbs visible light in a wavelength range other than is provided.

  Further, in the present embodiment, the cap 9 having a minimum necessary size is attached to the pointer 6, but this is not particularly essential.

  Moreover, as a meter apparatus of this invention, it can apply to meter apparatuses, such as various measuring instruments, such as a fuel gauge part, a tachometer part, a speedometer part, and a water temperature gauge, for example. Furthermore, although the meter device of the present invention has been described as an automobile instrument, it can also be applied as an instrument for various vehicles such as a ship instrument and an aircraft instrument.

DESCRIPTION OF SYMBOLS 1 Meter apparatus 11 Display part 12 Display board 13 In-case reflection part 14 Blindfold member 2 Substrate 3 Light source 4 Movement 40 Movement case 4A Upper surface 40A, 40B, 50 Shaft hole 41 Rotating shaft 5 Dial plate 50 Shaft hole 6 Pointer 60 Inhibition member 61 Pointer shaft 62 Pointer body 63 Base 7 Light guide member (prism)
71 Pilot hole 71A Ceiling surface 71B Upper inner peripheral surface 72 Upper hole 72A Floor surface 72B Lower inner peripheral surface 73 Lower surface 74 Upper surface 8 Light shielding member 80 Through hole 81, 82 Bearing portion 9 Cap 10 Case D Shaft hole inner diameter G of dial Reduction gear train L Cap length on short side M Step motor

Claims (4)

A movement having a rotating shaft on which light emitted from a light source is incident, a motor that rotates the rotating shaft, and a movement case that houses the rotating shaft and the motor inside;
Dial with various marks,
A reflection part in the case of the instrument in which the movement is arranged in a concavely curved depression located on the back surface of the dial,
A state in which a part of the light from the light source that has been propagated through the rotation shaft is diffused toward the movement case outer surface of the movement or the reflection part in the case. a light guide member for refraction in,
A pointer main body indicating a mark on the dial, and a base end side of the pointer main body that is suspended from the base of the pointer main body toward the dial is inserted into the shaft hole of the dial in a rotatable state and the light guide member A pointer shaft that can be connected to the tip end side of the rotary shaft via
On the back side of the dial, a light-shielding member that is attached to the proximal end of the pointer shaft and prevents light emitted from the light guide member from leaking to the outside from the shaft hole of the dial ,
The meter device according to claim 1, comprising: The light guide member and the light shielding member constitute means for connecting the pointer shaft and the rotation shaft,
The meter device according to claim 1 . The light guide member includes an upper hole into which the tip end of the pointer shaft is press-fitted as means for connecting the pointer shaft, and a pilot hole into which the tip end of the rotary shaft is press-fitted as means for connecting the rotary shaft. And
The upper hole has a convex lens shape in which a floor surface bulges, and a lower inner peripheral surface extending from the floor surface expands upward,
The pilot hole has a convex lens shape in which a ceiling surface bulges, and an upper inner peripheral surface extending from the ceiling surface expands downward.
The meter device according to claim 2 . A light transmission suppressing member that suppresses transmission of light from the inside of the pointer shaft to the outside is provided in a portion of the outer peripheral surface of the pointer shaft that is located closer to the dial than the light shielding member. Yes,
The meter device according to any one of claims 1 to 3 , wherein

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