JP5360590B2 - Indicating instrument - Google Patents

Description

  The present invention relates to an indicating instrument provided with an indicating portion that rotates in front of a display member made of a dial, a liquid crystal display, or the like.

  Conventionally, as this kind of indicating instrument, for example, the one described in Patent Document 1 below is known. The indicator instrument described in Patent Document 1 includes a dial plate (display member) having a display unit, a circuit board disposed behind the dial board, and a driving device that is conductively mounted behind the circuit board. And a substantially U-shaped indicating member that bypasses the dial and is mounted on a rotating shaft of a driving device that extends through the hole provided in the circuit board and extends toward the dial.

International Publication No. 2006/5821

  In this case, the indicating member is attached to the rotating shaft so as to avoid the dial, and includes a base portion formed of a substantially bar-shaped arm piece disposed between the dial and the circuit board, a side periphery of the dial, and a character. It is arranged on the front side of the plate and is composed of a substantially L-shaped connecting body connected to the base.

  The coupling body is made of a light-transmitting synthetic resin, and an indication portion positioned on the front side of the dial so as to indicate the display portion, and a side of the dial so as to connect between the indication portion and the base portion. The connecting portion located around is integrally formed, and a base hole corresponding to the lower end portion of the connecting portion is formed with a through hole, and the lower end portion of the connecting portion is fitted into the through hole so that the base portion And the connected body are connected. The light source is fixed (arranged) on the back surface of the lower end portion of the connecting portion.

  The light source includes a light emitting body that emits light from the indicator unit connected to the base through a connection unit, and illumination light emitted from the light source is guided to the instruction unit through the connection unit located directly above the light source. As a result, the instruction unit emits light. Moreover, in the indicating instrument described in Patent Document 1 described above, the light source and the circuit board are conductively connected via a flexible substrate such as a flexible wiring board in order to supply lighting power to the light source. The flexible substrate is provided so as to wrap around the rotation shaft of the driving device disposed behind the dial so as to follow the rotation of the indicating member (indicating portion). With a predetermined slack.

However, in the indicating instrument described in Patent Document 1 described above, the winding state of the flexible substrate around the rotating shaft changes momentarily in conjunction with the movement of the indicating member (indicating portion), and thus changes with time. As a result, the flexible substrate may be disconnected. When the flexible substrate is disconnected, there is a problem that stable power (the power for lighting) cannot be supplied to the light source, and there remains room for further improvement in this respect.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an indicating instrument capable of supplying stable power to a light source in order to cope with the above-described problems.

The present invention includes a display member having a display unit, a drive device disposed behind the display member, a base unit mounted on a rotation shaft of the drive device and positioned around the rotation shaft, and the display unit. In an indicating instrument comprising an indicating member having an indicating portion for indicating, and a light source disposed on the indicating member to cause the indicating portion to emit light, a first coil provided on the drive device side, the first coil A second coil provided on the base side so as to correspond to the first coil, and a wiring member for electrically connecting the second coil and the light source, and the first coil Power is supplied to the light source through the wiring member by electromagnetic induction action with the second coil, and the driving device is mounted behind a circuit board on which a wiring pattern is applied, The first coil includes the circuit board. Housed in a first frame body disposed above, wherein the first magnetic shielding member that is interposed between the first coil and the first frame.

According to the present invention, the second coil is housed in a second frame disposed in the base, and the first magnetic shield member functions to block the release of magnetic lines of force to the circuit board side. And the second magnetic shield member interposed between the second coil and the second frame has the base portion of the magnetic field lines extending from the first coil to the second coil. It has a function of blocking the release to the side .

The present invention is, between the front SL circuit board and the base, a peripheral wall open end side is disposed close to said second coil with surrounding the first coil located on the circuit board A third magnetic shield member having a bottom wall portion disposed between the circuit board and the first coil is provided.

According to another aspect of the present invention, there is provided a display member having a display unit, a drive device disposed behind the display member, a base unit mounted on a rotation shaft of the drive device and positioned around the rotation shaft, and the display unit In an indicating instrument comprising: an indicating member having an indicating portion that indicates a light source; and a light source disposed on the indicating member to cause the indicating portion to emit light, a first coil provided on the drive device side, A second coil provided on the base side so as to correspond to the first coil; and a wiring member for electrically connecting the second coil and the light source. And the second coil are configured to supply power to the light source through the wiring member, and the base portion is positioned around the rotating shaft behind the display member. A first arm portion; A second arm portion positioned on the side of the display member so as to connect the arm portion of the display member and the indicating portion positioned in front of the display member, and the wiring member includes the first arm A first wiring portion disposed so as to correspond to the portion, a second wiring portion disposed so as to correspond to the second arm portion, the first wiring portion, and the second wiring portion. A curved wiring portion or an inclined wiring portion is provided at a boundary portion with the wiring portion.

  Further, the invention is characterized in that a holding portion for holding the second coil is formed on the base portion.

  In the invention, it is preferable that the wiring member is disposed so as to be in close contact with the base portion.

  According to the present invention, it is possible to provide an indicating instrument that can achieve an initial purpose and can supply stable power to a light source.

The front view of the indicating instrument by 1st Embodiment of this invention. AA sectional drawing of FIG. The expanded sectional view which expands and shows the B section in FIG. Sectional drawing of the principal part of the indicating instrument by 2nd Embodiment of this invention. Sectional drawing of the principal part of the indicating instrument by 3rd Embodiment of this invention. Sectional drawing of the indicating instrument by 4th Embodiment of this invention. Sectional drawing of the indicating instrument by 5th Embodiment of this invention.

(First Embodiment) An embodiment in which the present invention is applied to an indicating instrument comprising a speedometer mounted on a vehicle will be described below with reference to FIGS.

  In FIG. 1 and FIG. 2, the indicating instrument M is composed of a speedometer that displays the speed of the vehicle, and is connected to the display member 10, the circuit board 20 arranged behind the display member 10, and the circuit board 20. The drive device 40 that is mounted and the rotation shaft 30 extends toward the display member 10, the pointing member 50 that is mounted at the tip of the rotation shaft 30 so as to bypass the display member 10, and the frame body that is placed on the circuit board 20 60, an instrument housing 70 serving as an outer case of the indicating instrument M, and a turning member 80 disposed on the instrument housing 70 so as to expose the display member 10 and an indicating portion to be described later of the indicating member 50. ing.

  The display member 10 includes a display 11, a storage case 12 that stores the display 11, and a front cover 13 that covers an opening window 12 a provided on the front surface of the storage case 12. It is fixed to the substrate 20.

  The display 11 displays information related to the vehicle. Examples of the vehicle-related information include various information such as route guidance, vehicle warning display, and outside air temperature.

  The display 11 includes a dot matrix type liquid crystal display element 14 for displaying the various information, a plurality of element light sources 15 for illuminating the liquid crystal display element 14, a liquid crystal display element 14, and an element light source. 15, an optical member 16 made of a diffusion plate or the like for uniformizing illumination light from the element light source 15 to the liquid crystal display element 14, the liquid crystal display element 14, the element light source 15, and the optical member. 16, and a cover 18 that covers the periphery of the case body 17 and the periphery of the liquid crystal display element 14 so as to face a display area (not shown) of the liquid crystal display element 14.

  A boss portion 17a that protrudes toward the bottom wall portion 12b of the storage case 12 is provided at the bottom side central portion of the case body 17, and this boss portion 17a is a through-hole provided at a substantially central portion of the bottom wall portion 12b. The indicator 11 is fixed to the storage case 12 by being fitted into the hole 12c.

  The storage case 12 is made of a light-shielding synthetic resin and is formed in a bottomed cup shape, and surrounds the above-described opening window 12a, the above-described bottom wall portion 12b corresponding to the opening window 12a, and the bottom wall portion 12b. It is mainly comprised from the side wall part 12d. In the storage case 12, an opening 12e for taking in illumination light from a light emitter, which will be described later, is formed at and around the boundary portion between the bottom wall portion 12b and the side wall portion 12d.

  The front cover 13 is made of a translucent synthetic resin, and is made of a see-through portion that can visually recognize the inside of the display 11 and the storage case 12 from the vehicle user side. The front cover 13 in this example is configured to have a part of the indicator of the instrument dial, and a display portion 13a composed of a speed number corresponding to the operating range of the indicating portion is formed on the periphery thereof. Become.

  In addition, although the detailed illustration is abbreviate | omitted in this example, the display part 13a is formed by the fine unevenness | corrugation provided in the back surface of the front cover 13. FIG. Further, a wall portion 13 b that hangs down toward the driving device 2 is provided on the periphery of the front cover 13. The wall portion 13b serves to fix the front cover 13 to the storage case 12, and also serves to incorporate illumination light from the light emitter.

  As a result, the display unit 13a provided on the front cover 13 is illuminated and displayed by the illumination light introduced into the storage case 12 through the opening 12e and the illumination light introduced from the wall 13b of the front cover 13. .

  The circuit board 20 is made of a hard circuit board in which, for example, a glass epoxy base material is provided with a wiring pattern (not shown). On the circuit board 20, a light emitter 21, a first coil unit 22, and a frame are formed. The body 60 is placed.

  The circuit board 20 includes a light emitter 21, a first coil (described later) provided in the first coil unit 22, a drive circuit (not shown) for driving and controlling the drive device 40, and a liquid crystal display element. 14, an element drive circuit (not shown) that performs display control, a first light source drive circuit (not shown) that performs light emission control of the element light source 15, and a second light source that performs light emission control of the light emitter 21. A drive circuit (not shown) and various circuit components (not shown) such as resistors and capacitors are conductively connected to the wiring pattern.

  The light emitter 21 is formed of a light emitting diode that emits a color as appropriate, and illuminates the periphery of the display 11 and the display unit 13a.

  As shown in FIG. 3, the first coil unit 22 includes a first coil 23, a first frame body 24, and a first magnetic shield member 25.

  The first coil 23 is composed of a planar coil (flat coil) formed in a spiral shape in the same plane, and the drive device is arranged so as to surround the end portion 31 of the rotating shaft 30 located on the circuit board 20 side. It is provided on the circuit board 20 on the 40 side.

  The first frame 24 is made of a substantially annular plate having a first through portion 24a surrounding the end portion 31 of the rotating shaft 30, and the material is made of synthetic resin. The first frame body 24 is disposed on the circuit board 20, and includes an inner annular protrusion 24b, an outer annular protrusion 24c, a lower end side of the inner annular protrusion 24b, and a lower end side of the outer annular protrusion 24c. And a first annular plate portion 24d having a substantially annular plate shape.

  The inner annular protruding portion 24b protrudes toward the display member 10 so as to surround the first through portion 24a. The outer annular protrusion 24c is located outside the inner annular protrusion 24b and protrudes toward the display member 10 in the same manner as the inner annular protrusion 24b. The first annular plate portion 24d and the circuit board 20 corresponding to the first annular plate portion 24d are closely fixed by a double-sided tape or the like (not shown), whereby the second coil unit 22 (first frame body 24). ) Is fixed (arranged) on the circuit board 20.

  And the 1st coil 23 which consists of the planar coil formed in the spiral shape in the hollow part enclosed by the inner side annular protrusion part 24b, the outer side annular protrusion part 24c, and the bottom part 24c is embedded. That is, this means that the first coil 23 is housed in the first frame body 24.

  The first magnetic shield member 25 is made of, for example, SPC (cold rolled steel plate) classified as a soft magnetic material in a ferromagnetic material, and is interposed between the first coil 23 and the first annular plate portion 24d. As such, it is accommodated in the first frame 24. The first magnetic shield member 25 blocks the release of magnetic lines of force to the side opposite to the position where the second coil, which will be described later, is disposed (that is, the back side of the first coil unit 22 on the circuit board 20 side). It has a function.

  The first magnetic shield member 25 is not the cold-rolled steel sheet, but a configuration in which a ferromagnetic film made of a ferromagnetic metal thin film is formed on a resin film such as a PET film, although not shown in detail. It is also possible to do. In this case, the first magnetic shield member 25 is disposed in the first frame 24 so that the ferromagnetic film is positioned on the first coil 23 side.

  The driving device 40 is composed of a movable magnet-type instrument or a stepping motor, and is disposed on the back side of the display member 10, and the main part thereof is so that the rotating shaft 30 extends through the circuit board 20 to the display member 10 side. It is mounted behind the circuit board 20 and is conductively connected to the wiring pattern (the driving means) by appropriate conductive means such as soldering.

  The indication member 50 is formed in a substantially U-shape and is connected to the base 51 as a substantially L-shaped arm piece disposed so as to avoid the display member 10, and the display unit 13a is connected to the base 51. An instruction unit 52 is provided in front of the front cover 13 (display member 10) so as to instruct (see FIG. 2).

  The base 51 is made of synthetic resin and is substantially parallel to the plate surface of the circuit board 20. One end of the base 51 is attached to the rotary shaft 30, and one end of the first arm 53 is connected to the first arm 53. Is formed integrally with a second arm portion 54 extending from the other end side of the first arm portion 53 on the opposite side to the facing member 80 side so as to be orthogonal to the plate surface.

  A substantially circular through-hole 53a is formed in the first arm portion 53 at the rotary shaft 30 side so as to penetrate the tip end portion 32 of the rotary shaft 30 located on the side opposite to the end portion 31 of the rotary shaft 30. Is formed (see FIG. 3). In this example, the display member 10 is connected so that the first arm portion 53 positioned around the rotation shaft 30 on the back side of the display member 10, and the first arm portion 53 and the instruction portion 52 are connected. The curved surface part 55 is formed in the boundary part with the 2nd arm part 54 located in the side of this.

  In addition, the second coil unit 90 is provided so as to surround 30 rotation shafts located between the distal end portion 31 and the distal end portion 32 on the bottom side peripheral edge of the through hole 53a in the base portion 51 (first arm portion 53). Is arranged (see FIG. 3). The second coil unit 90 includes a second coil 91, a second frame 92, and a second magnetic shield member 93 that are arranged so as to be capable of electromagnetic induction with the first coil 23. I have.

  Similarly to the first coil 23, the second coil 91 is configured by a planar coil (flat coil) formed spirally in the same plane, and is located between the end portion 31 and the tip portion 32. It is provided on the first arm portion 53 side (base portion 51 side) so as to surround 30 rotation shafts.

  The second coil 91 faces the first coil 23 (corresponds to the first coil 23) in the thickness direction of the indicating instrument M (in other words, the direction orthogonal to the plate surface of the circuit board 20). Thus, it is configured to be installed on the first arm portion 53 side (base portion 51 side).

  The second frame body 92 is made of a substantially annular plate having a second through portion 92a surrounding the 30 rotation shafts located between the end portion 31 and the tip portion 32, and the material is made of synthetic resin. Become. The second frame 92 has a substantially annular plate-like shape that connects the inner annular hanging portion 92b, the outer annular hanging portion 92c, the upper end side of the inner annular hanging portion 92b, and the upper end side of the outer annular hanging portion 92c. 2 annular plate portions 92d.

  The inner annular hanging portion 92b is formed to protrude toward the circuit board 20 so as to surround the second through portion 92a. The outer annular hanging portion 92c is located outside the inner annular hanging portion 92b, and protrudes toward the circuit board 20 similarly to the inner annular hanging portion 92b. In addition, a hole 92e for allowing the end portion C of the second coil 91 to pass through is formed in the outer annular hanging portion 92c. As a result, the end portion C of the second coil 91 is led out from the hole 92e and extends to the flexible substrate described later, and is electrically connected to the conductor provided in the flexible substrate. ing.

  The second annular plate portion 92d and the back surface portion of the first arm portion 53 corresponding to the second annular plate portion 92d are closely fixed by a double-sided tape or the like (not shown), whereby the second coil unit 90 (first The second frame body 92) is fixed (arranged) to the back surface of the first arm portion 53 (that is, the base portion 51).

  And the 2nd coil 91 which consists of a plane coil formed spirally in the hollow part surrounded by inner annular hanging part 92b, outer annular hanging part 92c, and the second annular board part 92d, and It has become. That is, this means that the second coil 91 is housed in the second frame 92. In this case, it is needless to say that the second coil 91 is fixedly held on the second frame 92 by a fixing means as appropriate in order to prevent the second coil 91 from falling off.

  The second magnetic shield member 93 is made of, for example, SPC (cold rolled steel plate), and is disposed in the second frame 92 so as to be interposed between the second annular plate portion 92 d and the second coil 91. Be contained. The second magnetic shield member 93 has a function of blocking the release of magnetic lines of force extending from the first coil 23 to the second coil 91 to the first arm portion 53 side (base portion 51 side).

  The second magnetic shield member 93 is not the cold-rolled steel sheet, but a configuration in which a ferromagnetic film made of a ferromagnetic metal thin film is formed on a resin film such as a PET film although not shown in detail. It is also possible to do. In this case, the second magnetic shield member 93 is disposed in the second frame 92 so that the ferromagnetic film is positioned on the second coil 91 side.

  On the other hand, a space 56 is provided in the second arm portion 54 on the instruction unit 52 side, and a light source 57 is provided in the space 56. The light source 57 is composed of a light emitting diode that emits an appropriate color, and is a light emitter for supplying illumination light to the instruction unit 52 to cause the instruction unit 52 to emit light. The light source 57 is flexible so that the light emitting surface faces the instruction unit 52 side. It is mounted on a conductive substrate 58 (that is, a conductor described later provided in the flexible substrate 58).

  Thus, the flexible substrate (wiring member) 58 electrically connected to the light source 57 is formed of a flexible wiring board in which a conductor (signal transmission line) (not shown) is provided on a soft insulating substrate such as polyimide. Become.

  The flexible substrate 58 has a light source 57 on one end side and a base portion so that the other end side is located on the bottom surface portion of the first arm portion 53 near the terminal portion C of the second coil 91. The configuration is fixed (arranged) to 51.

  At this time, the flexible substrate 58 is disposed along the outer peripheral surface of the second arm portion 54 on the light source 57 side, the outer peripheral surface of the curved surface portion 55, and the bottom surface of the first arm portion 53. The conductive portions located on the bottom surface side of the first arm portion 53 and the terminal portion C of the second coil 91 are electrically connected to each other by appropriate conduction means such as soldering. Yes.

  That is, the flexible substrate 58 is positioned between the light source 57 and the second coil 91 in a state of being in close contact with the base 51 and is disposed so as to correspond to the first arm portion 53 (that is, the first arm 53). The first wiring portion 58a is in close contact with the bottom surface of the arm portion 53 and the second arm portion 54 is disposed so as to correspond to the second arm portion 54 (that is, in close contact with the outer peripheral surface of the second arm portion 54). ) A curved wiring portion having a curved shape disposed so as to be in close contact with the outer peripheral surface of the curved surface portion 55 at the boundary portion between the second wiring portion 58b and the first wiring portion 58a and the second wiring portion 58a. 58c, and has a function as a connection member for electrically connecting the light source 57 and the second coil 91.

  By the way, when a power supply circuit (not shown) provided on the circuit board 20 operates, an alternating current is supplied to the first coil 23 connected to the power supply circuit along with the operation of the power supply circuit.

  Then, electric power (alternating current) is transmitted to the second coil 91 by electromagnetic induction, and the electric power is flexibly connected to the second coil 91 and the second coil 91 (terminal portion C). The light is transmitted to the light source 57 that is conductively connected to the flexible substrate 58 (the conductor) through the conductive substrate 58 (the conductor). As a result, the light source 57 is turned on, and the instructing unit 52 shines (emits light). That is, this means that when the alternating current is supplied to the first coil 23, the second coil 91 and the second coil 91 are electrically connected by the electromagnetic induction action between the first coil 23 and the second coil 91. This means that power is supplied to the light source 57 through the flexible substrate 58 connected to the light source 57, and the indicator 52 shines.

  Here, for example, the flexible substrate 58 is configured by only the first and second wiring portions 58a and 58b without providing the curved wiring portion 58c at the boundary portion, and the second wiring portion 58b is the first wiring portion. When the signal transmission line is bent at a right angle with respect to 58a (in other words, when the curved wiring portion 58c is eliminated in the state of FIG. 2 and a corner portion having an angular shape is formed at the boundary portion), the signal transmission line When the transmission signal transmitted through the line (that is, the AC waveform signal that is the alternating current) is transmitted from the first wiring part 58a to the second wiring part 58b through the corner part, the transmission is performed at the corner part. It is known that the characteristic impedance value of a signal becomes discontinuous.

  Then, at the discontinuous point of the characteristic impedance of the transmission signal, the transmission signal is reflected from the corner portion to the first wiring portion 58a side as a reflected transmission signal, for example, the first wiring portion. When the transmission signal (hereinafter referred to as a traveling transmission signal) from 58a toward the corner and the reflected transmission signal are combined so as to have a waveform distortion, signal transmission in the first wiring portion 58a is performed. Unnecessary electromagnetic waves (noise) are radiated from the line. Further, the transmission signal is less likely to be transmitted to the second wiring portion 58b side (light source 57 side) with the reflection of the transmission signal.

  However, in the present embodiment, the first wiring portion 58a and the transmission signal characteristic impedance value in the first wiring portion 58a and the characteristic impedance value of the transmission signal in the curved wiring portion 58c are substantially matched. A curved wiring portion 58c is formed at the boundary with the second wiring portion 58b that is orthogonal to each other, instead of forming the corner portion that becomes a discontinuous point of the characteristic impedance.

  As a result, the characteristic impedances of the three components in the first wiring portion 58a, the curved wiring portion 58c, and the second wiring portion 58b are substantially matched, so that the reflected transmission signal that has caused the radiation noise described above is generated. Generation is suppressed. In addition, since the transmission signal is satisfactorily transmitted from the flexible substrate 58 to the light source 57 as the generation of the reflected transmission signal is suppressed, stable power can be supplied to the light source 57. Become.

  In addition, the instruction unit 52 that rotates on the front cover 13 by driving the driving device 40 is made of a substantially elongated bar-like light-transmitting synthetic resin, and is connected and fixed to the base 51 (second arm portion 54), and the display unit. 13a and an indicator portion for indicating a scale portion to be described later.

  The frame body 60 is made of a white synthetic resin and has a function as a reflector for efficiently reflecting the illumination light from the light emitter 21 toward the display member 10. The frame 60 includes a first reflecting wall 61 having an inclined shape disposed to face the light emitter 21 so as to reflect illumination light emitted from the light emitter 21 to the outside (peripheral direction), and the first reflecting wall. And a second reflecting wall 62 which is located outside 61 and reflects the illumination light reflected toward the outer peripheral direction toward the display member 10 (opening 12e side).

  The instrument housing 70 is made of a light-shielding synthetic resin, and is formed in a bottomed cup shape. The display housing 10, the circuit board 20, the rotating shaft 30, the driving device 40, the indicating member 50, the frame body 60, and the like are indicated therein. Each component of the meter M is accommodated.

  The facing member 80 is made of a substantially annular light-shielding synthetic resin, and is placed on the instrument housing 70 so as to cover the periphery of the front opening 71 of the instrument housing 70. On the turning member 80, a scale portion 81 corresponding to the display portion 13a is raised. In addition, each scale part 81 in this example is formed in the substantially elongated rod shape, and is provided in the area | region from the approximate center part of the turning member 80 to the front cover 13 periphery.

  As described above, in the present embodiment, the display member 10 having the display unit 13a, the driving device 40 disposed behind the display member 10, and the rotating shaft 30 of the driving device 40 are attached to the display member 10 to avoid the display member 10. The indicator 51 having the base 51 arranged in this manner and the indicator 52 connected to the base 51 so as to indicate the display unit 13a, and the second arm part in the indicator 50 for causing the indicator 52 to emit light In the indicating instrument M provided with the light source 57 disposed at 54, the first coil 23 provided on the circuit board 20 side (drive device 40 side) and the first coil 23 corresponding to the first coil 23 are provided. The first coil includes a second coil 91 provided on the arm 53 side (base 51 side), and a flexible substrate 58 for electrically connecting the second coil 91 and the light source 57. 23 and the second coil 91 The electromagnetic induction between the feed to the light source 57 via the flexible substrate 58 is configured to be made. Further, the flexible substrate 58 is fixed (arranged) so as to be in close contact with the base 51.

  Therefore, the flexible substrate is wound around the rotation shaft of the driving device as in the conventional case, and the winding state of the flexible substrate on the rotation shaft is momentarily interlocked with the movement (rotation) of the indication member (instruction unit). The flexible substrate 58 is fixed to the base 51 so as to be conductively connected to the second coil 91 using the electromagnetic induction action between the first coil 23 and the second coil 91, instead of the configuration that changes. Therefore, there is no possibility of the flexible substrate 58 being disconnected. Thereby, an indicating instrument capable of supplying stable power to the light source 57 can be provided.

  In the present embodiment, the driving device 40 is conductively attached to the back of the circuit board 20 having the wiring pattern, and the first coil 23 is placed in the first frame 24 provided on the circuit board 20. While being housed, the second coil 91 is housed in a second frame 92 disposed on the first arm portion 53 (base 51), and the first coil 23 and the first frame 24 ( The first magnetic shield member 25 for blocking the release of the magnetic lines of force toward the circuit board 20 is interposed between the first annular plate portion 24d), and the second coil 91 and the second frame body 92 are interposed. A second magnetic shield member 93 for blocking the release of the magnetic lines of force extending from the first coil 23 to the second coil 91 toward the base 51 side is interposed between the second annular plate portion 92d and the second circular plate portion 92d. Thus, the lines of magnetic force generated by the first coil 23 and the second coil 91 are Part 51 side or is inhibited from being diffused to the circuit board 20 side, thereby for example it is possible to prevent malfunction of the various circuits provided in the circuit board 20 (the element driving circuit and the light source drive circuit).

  In the present embodiment, the base 51 includes a first arm portion 53 positioned around the rotation shaft 30 on the back side of the display member 10, and an instruction unit positioned in front of the first arm portion 53 and the display member 10. The flexible substrate 58 that is a wiring member corresponds to (adheres to) the first arm portion 53. The second arm portion 54 is located on the side of the display member 10 so as to be connected to the display member 10. The first wiring part 58a, the second wiring part 58b, the first wiring part 58a, the second wiring part 58b, the second wiring part 58b, and the second wiring part 58a. By providing the curved wiring portion 58c disposed at the boundary portion with the wiring portion 58b (that is, disposed in close contact with the outer peripheral surface of the curved surface portion 55), the characteristic impedance of the three parties can be reduced. By substantially matching, the signal transmission line in the first wiring part 58a is obtained. Possibility that unnecessary electromagnetic waves are radiated from the down is eliminated.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 4. The same reference numerals are used for the same or corresponding parts as in the first embodiment, and a detailed description thereof will be given. Is omitted. In the second embodiment, the second frame 92 in the second coil unit 90 employed in the first embodiment is eliminated, and the second coil is formed on the base 51 (first arm portion 53). A holding portion 59 that holds the second coil unit 90 composed of 91 and the second magnetic shield member 93 is integrally formed.

  The holding portion 59 is formed to hang (projected) from the bottom surface of the first arm portion 53 toward the circuit board 20 so as to surround the rotation shaft 30, and is positioned between the end portion 31 and the tip portion 32. A first cylindrical portion 59a that is an inner annular hanging portion that surrounds 30 shafts, and an outer annular hanging portion that is positioned outside the first cylindrical portion 59a so as to further surround the first tubular portion 59a. A second tubular portion 59b.

  The second cylindrical portion 59b is formed with a hole 59c for allowing the end portion C of the second coil 91 to pass therethrough. As a result, the end portion C of the second coil 91 is led out from the hole 59c and extends toward the flexible substrate 58, and is electrically connected to the conductor provided on the flexible substrate 58. ing.

  And the 1st cylindrical part 59a, the 2nd cylindrical part 59b, the bottom face location of the 1st arm part 53 located between these 1st cylindrical parts 59a and the 2nd cylindrical part 59b, and The second coil 91 and the second magnetic shield member 93 are embedded in a hollow portion having a substantially annular groove shape surrounded by a circle. At this time, it goes without saying that the second coil 91 is fixed and held by the holding portion 59 as appropriate by means of fixing so as to prevent the second coil 91 from falling off. Accordingly, the second magnetic shield member 93 is sandwiched between the bottom surface portion of the first arm portion 53 and the second coil 91.

  Also in the second embodiment, a flexible substrate fixed to the base 51 so as to be conductively connected to the second coil 91 using the electromagnetic induction action between the first coil 23 and the second coil 91. Since the power is supplied to the light source 57 via 58, an indicating instrument capable of supplying stable power to the light source 57 as in the first embodiment can be provided.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. 5. The same reference numerals are used for the same or corresponding parts as in the first and second embodiments, and the details thereof are used. The detailed explanation is omitted. In the third embodiment, the first and second magnetic shield members 25 and 93 employed in the first and second embodiments are abolished with the configuration of the second embodiment as a basic configuration. The coil 23 and the first annular plate portion 24d are brought into close contact with each other, the second coil 91 and the second annular plate portion 92d are brought into close contact with each other, and the circuit board 20 and the first arm portion 53 (base portion 51). The third magnetic shield member 100 made of a ferromagnetic material is disposed between the two.

  The third magnetic shield member 100 is made of SPC or the like. In this case, the third magnetic shield member 100 has a substantially cylindrical cup shape, and surrounds the first coil unit 22 (first coil 23) located on the circuit board 20. The cylindrical peripheral wall portion 101 provided on the bottom wall portion 102 and the bottom wall portion 102 formed so as to cover the lower end side opening of the peripheral wall portion 101 are integrally formed. Is formed with a hole 103 composed of a substantially circular through hole through which the end portion 31 of the rotary shaft 30 passes.

  The lower end side of the peripheral wall portion 101 surrounds the first coil unit 22 (first coil 23), and the open end side, which is the front end side, extends to the first arm portion 53 side. The portion is disposed close to the second cylindrical portion 59b (second coil 91) of the holding portion 59 so that the portion does not leak to the outside (around the third magnetic shield member 100).

  That is, in this case, a minute clearance of about several millimeters is formed between the distal end side of the peripheral wall portion 101 and the second cylindrical portion 59b in order to smoothly rotate the indicating member 50. It has become. Such a state means that the distal end side of the peripheral wall portion 101 is in a state of being disposed close to the second cylindrical portion 59b (second coil 91).

  On the other hand, an annular bottom wall portion 102 having a hole portion 103 formed in a substantially central portion is disposed between the circuit board 20 and the first frame body 24 (first coil 23). The first coil 23 is located above the wall 102 and the circuit board 20 is located below the bottom wall 102. In the case of the third embodiment, the bottom wall portion 102 is configured (mounted) on the circuit board 20 via an insulating resin (insulating member) (not shown). The substrate 20 and the third magnetic shield member 100 are electrically insulated by the insulating resin.

  According to the third embodiment, the substantially cylindrical cup-shaped third magnetic shield member 100 is disposed between the circuit board 20 and the first arm portion 53 (base portion 51). The cup-shaped third magnetic shield member 100 includes a cylindrical peripheral wall portion 101 that surrounds the first coil 23 located on the circuit board 20 and has a distal end side disposed close to the second coil 91, and the peripheral wall. The bottom wall portion 102 is disposed between the circuit board 20 and the first coil 23 so as to cover the lower end side opening of the portion 101.

  Therefore, a part of the lines of magnetic force emitted from the first coil 23 due to the electromagnetic induction action is the first coil 23 → the second coil 91 → the peripheral wall 101 as shown by a one-dot chain line in FIG. In order to form a pair of substantially loop-shaped closed magnetic paths T passing through the distal end side → the lower end side of the peripheral wall portion 101 → the bottom wall portion 102 → the first coil 23, a part of the magnetic lines of force is the third magnetic shield member 100. And the like, the same effects as the first and second embodiments can be obtained, and various circuits (the element driving circuit and the light source driving circuit) provided in the circuit board 20 can be obtained. Etc.) can be prevented from malfunctioning.

  Further, in the present invention, in order to suppress unnecessary electromagnetic radiation from the signal transmission line in the first wiring portion 58a, the curved wiring portion 58c positioned at the boundary portion between the first and second wiring portions 58a and 58b is Although an example in which the curved surface portion 55 that connects the arm portions 53 and 54 is in close contact with the outer peripheral surface has been described, for example, as shown in FIG. Even when the curved wiring portion 58c is loosened so that the curved wiring portion 58c is separated from the curved surface portion 55, the generation of the electromagnetic wave radiation can be suppressed.

  Moreover, although this invention demonstrated the example in which the curved surface part 55 was formed in the boundary part of the 1st arm part 53 and the 2nd arm part 54 in the base 51, for example, it is shown as 5th Embodiment of this invention. 7, when the boundary portion between the first arm portion 53 and the second arm portion 54 is an inclined wall S having an inclined shape instead of the curved surface portion 55, in order to suppress the generation of the electromagnetic radiation, The slanted wiring part 58d may be provided so that the boundary part between the first wiring part 58a and the second wiring part 58b is in close contact with the sloping wall S, or the slack wiring part illustrated in FIG. Also good.

  In the present invention, an example in which the indication member 50 is mounted on the rotary shaft 30 of the drive device 40 so as to avoid (bypass) the display member 10 has been described. Instead of the indicating member 50 adopted, it is connected to a rotating shaft (a tip portion of the rotating shaft) through a through-hole provided in the display member, extends linearly on the display member and is covered with a light-shielding cover. It is also possible to employ an indicating member.

DESCRIPTION OF SYMBOLS 10 Display member 11 Display 13 Front cover 13a Display part 20 Circuit board 22 1st coil unit 23 1st coil 24 1st frame 25 1st magnetic shield member 30 Rotating shaft 40 Drive apparatus 50 Instruction member 51 Base 52 instruction unit 53 first arm unit 54 second arm unit 57 light source 58 flexible substrate (wiring member)
58a First wiring portion 58b Second wiring portion 58c Curved wiring portion 58d Inclined wiring portion 59 Holding portion 80 Turning member 81 Scale portion 90 Second coil unit 91 Second coil 92 Second frame 93 Second frame Magnetic shield member 100 Third magnetic shield member 101 Peripheral wall portion 102 Bottom wall portion

Claims (6)

A display member having a display unit;
A drive device disposed behind the display member;
An indicating member that is attached to the rotating shaft of the driving device and has a base portion that is located around the rotating shaft and an indicating portion that indicates the display portion;
In an indicating instrument comprising a light source disposed on the indicating member to cause the indicating unit to emit light,
A first coil provided on the drive device side;
A second coil provided on the base side so as to correspond to the first coil;
A wiring member for electrically connecting the second coil and the light source;
With the configuration in which power is supplied to the light source through the wiring member by electromagnetic induction between the first coil and the second coil ,
The drive device is mounted behind a circuit board on which a wiring pattern is applied, and the first coil is housed in a first frame body disposed on the circuit board, and the first coil and An indicating instrument comprising a first magnetic shield member interposed between the first frame and the first frame . The second coil is housed in a second frame disposed in the base;
The first magnetic shield member has a function of blocking the release of magnetic lines of force toward the circuit board; and
The second magnetic shield member interposed between the second coil and the second frame blocks the release of magnetic lines of force extending from the first coil to the second coil toward the base side. The indicating instrument according to claim 1 , having a function of Between the circuit board and the base part, a peripheral wall part surrounding the first coil located on the circuit board and having an opening end side disposed close to the second coil, the circuit board and the base part The indicating instrument according to claim 1, further comprising a third magnetic shield member provided with a bottom wall portion disposed between the first coil and the first coil. A display member having a display unit;
A drive device disposed behind the display member;
An indicating member that is attached to the rotating shaft of the driving device and has a base portion that is located around the rotating shaft and an indicating portion that indicates the display portion;
In an indicating instrument comprising a light source disposed on the indicating member to cause the indicating unit to emit light,
A first coil provided on the drive device side;
A second coil provided on the base side so as to correspond to the first coil;
A wiring member for electrically connecting the second coil and the light source;
With the configuration in which power is supplied to the light source through the wiring member by electromagnetic induction between the first coil and the second coil,
The base portion connects the first arm portion positioned around the rotation shaft on the rear side of the display member, and the first arm portion and the indication portion positioned in front of the display member. A second arm portion located on a side of the display member,
The wiring member includes a first wiring portion disposed so as to correspond to the first arm portion, a second wiring portion disposed so as to correspond to the second arm portion, the first wiring portion and the second wiring portion and the finger示計instrument you characterized in that it comprises a curved wire portion or inclined wire portion disposed at a boundary portion. The indicating instrument according to claim 1 or 4 , wherein a holding portion for holding the second coil is formed in the base portion. The wiring member, the indicating instrument according to claim 1 or claim 4, wherein the composed are disposed so as to be in close contact with the base.

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