JP2009204472A - Pointer instrument device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pointer instrument device capable of illuminating a pointer efficiently. <P>SOLUTION: This pointer instrument device is equipped with the pointer 1 for emitting light by receiving light supply from a light receiving part 14 provided on a rotation center part 12; a driving device 3 formed by projecting a pointer shaft 37 for driving the pointer 1 to the front side from a housing 38; a circuit board 4 arranged on the rear side of the driving device 3; and a light source 5 arranged on the front side of the circuit board 4, for supplying illumination light at least to the pointer 1. In the device, the driving device 3 has an arc-shaped housing part 380 corresponding to a rotation orbit of the light receiving part 14 around the pointer shaft 37 of the housing 38, and a plurality of light sources 5 are arranged on the circuit board 4 along the arc shape of the housing part 380, and the housing part 380 has the first wall part 381 facing to the pointer 1 and the second wall part 382 adjacent to the light source 5, and a tilt part 383 is provided between the first wall part 381 and the second wall part 382. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pointer-type instrument device using a drive device that is mounted on an instrument device such as a vehicle.

  Conventionally, for example, a coil-type movable magnet type instrument described in Patent Document 1 below is generally known as a drive unit used in this type of pointer-type instrument device. This movable magnet type instrument has a rotor magnet magnetized with N and S poles in a space formed in the housing, and accommodates the rotor magnet and projects the pointer shaft fixed to the rotor magnet forward. A housing that supports the shaft, and a pair of coils are wound around the outer periphery of the housing so as to intersect with each other. By controlling the supply according to the amount to be measured such as the vehicle speed and the engine rotation, the pointer is angularly moved according to the measured amount.

The drive device configured as described above is provided with a circuit board on the rear side for supplying a drive signal to the coil, and a display board provided with a shaft hole for penetrating the pointer shaft on the front side. A pointer made of a light guide material is attached to the tip of the pointer shaft. In the case of a light receiving type that emits light upon receiving light, the pointer is a light source disposed around the driving device on the circuit board, and the pointer is illuminated by this light source. In this case, the pointer is formed of a light-transmitting material, and a light receiving portion that receives light from the light source is formed. On the other hand, the housing of the driving device is an arc-shaped housing around the pointer shaft according to the rotation trajectory of the light receiving portion. A portion is formed, and a plurality of light sources are arranged on the circuit board along the arc shape of the housing portion so that illumination light can be supplied to the light receiving portion of the pointer.
JP2001-41981

  However, in the pointer-type instrument device described in Patent Document 1, the housing portion of the driving device has a first wall portion facing the pointer, and a second wall portion adjacent to each light source located on the circuit board. The side view (when viewed from the direction orthogonal to the pointer axis) is rectangular, and the light source must be placed slightly away from the drive device to prevent the illumination light from being reflected off the wall of the housing. There is a problem that the place where the light source is mounted is limited, and the degree of freedom in design is reduced.

  In addition, since the light source for the pointer illumination must be arranged at a position away from the pointer, a large arrangement diameter of the light source arranged concentrically along the turning trajectory of the pointer around the pointer shaft is secured. There is a problem that the degree of freedom of design is reduced because the dead space becomes large.

  The present invention has been made in view of these points, and provides a pointer-type instrument device that can efficiently illuminate a pointer without increasing the number of light sources and can further improve the degree of design freedom. For the purpose.

  In order to solve the above problems, the present invention provides a pointer that emits light by receiving light from a light receiving portion provided at a rotation center portion, and a driving device that projects a pointer shaft that drives the pointer forward from the housing, A circuit board disposed on the rear side of the driving device; and a light source disposed on the front side of the circuit board for supplying illumination light to at least the pointer, the driving device around the pointer shaft of the housing In the pointer-type instrument device, wherein a plurality of the light sources are arranged on the circuit board along the arc shape of the housing portion. The housing part has a first wall part facing the pointer and a second wall part adjacent to the light source, and an inclined part is provided between the first wall part and the second wall part. It is a thing.

ADVANTAGE OF THE INVENTION According to this invention, the pointer type instrument apparatus which can illuminate a pointer efficiently can be obtained.

  Hereinafter, an embodiment of the present invention will be described based on a pointer-type instrument device to which a coil-type movable magnet instrument is applied. FIG. 1 is a front view of a driving apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the pointer-type instrument device according to an embodiment of the present invention (the pointer cap, the pointer main body, and the display plate are not hatched). FIG. 3 is a top view of the driving device according to the embodiment of the present invention with the upper case removed. FIG. 4 is a sectional view of a driving apparatus according to an embodiment of the present invention.

  1 and 2, the pointer-type instrument device of the present embodiment drives the pointer 1, the display plate 2 disposed behind the pointer 1, and the pointer 1 on the display plate 2 based on the survey value. A driving device 3, a circuit board 4 disposed behind the driving device 3, and a light source 5 disposed on the circuit board 4 are provided.

  The pointer 1 includes a pointer main body 11 made of a translucent synthetic resin such as polycarbonate or acrylic resin, and a pointer cap 13 that covers the rotation center portion 12 of the pointer main body 11.

  The pointer main body 11 indicates an indicator portion (not shown) described later, and a red hot stamp layer (not shown) is printed on the back surface or the surface thereof. A light receiving part 14 for introducing illumination light and a reflection part 15 for reflecting the illumination light introduced from the light receiving part 14 toward the pointer 1 are formed in the rotation center part 12, and light is supplied to the rotation center part 12. The pointer 1 is shining.

  The display plate 2 is obtained by performing various printings on a base material made of a transparent member, and has an index portion (not shown) such as a scale or a mark corresponding to the pointer 1. 12 and an opening 21 is provided at a location corresponding to the orientation of the illumination light of the light source 5.

  The drive device 3 includes a rotor magnet 31 magnetized with multiple poles, a rotor gear 32 fixed to the rotor magnet 31, a first gear 32a meshing with the rotor gear 32, and coaxially with the first gear 32a. An intermediate gear 33 having a second gear 32 b provided, an output gear 34 meshing with the second gear 32 b of the intermediate gear 33, and two excitation coils that generate a rotating magnetic field and apply a rotational force to the rotor magnet 31. 35, a metal first rotating shaft 36a that becomes the rotation center of the rotor magnet 31, a metal second rotating shaft 36b that becomes the rotation center of the intermediate gear 33, and a metal that becomes the rotation center of the output gear 34. An output shaft 37 made of a metal and a housing 38 in which these are housed are mainly configured.

  The rotor magnet 31 is made of, for example, a synthetic resin having magnetism, such as a plastic magnet. The rotor magnet 31 has a circular shape and includes a through hole 31a through which the rotor gear 32 and the first rotating shaft 36a pass. In the case of this embodiment, the rotor magnet 31 includes a total of four magnetic poles, each having two N poles and two S poles, so as to be uniform in the radial direction around the rotation axis.

  The rotor gear 32 is made of a synthetic resin that does not have magnetism, and a gear having an appropriate number of continuous teeth formed on the outer periphery of the rotor gear 32 rotates as the rotor magnet 31 rotates, and the first rotating shaft 36a is rotated by the rotor gear 32. It penetrates.

  The intermediate gear 33 is made of a synthetic resin that does not have magnetism, and includes a first gear 32a that meshes with the rotor gear 32 and a second gear 32b that meshes with the output gear. The first gear 32a is larger in diameter than the rotor gear 32, has more continuous teeth on the outer periphery than the rotor gear 32, and is fixed to the second rotating shaft 36b. The second gear 32 b is provided in a through-hole through which the second rotation shaft 36 b passes, and the number of continuous teeth is smaller than that of the rotor gear 32.

  The output gear 34 is made of a synthetic resin not having magnetism, meshes with the second gear 32b of the intermediate gear 33, and is provided with an output shaft 37 serving as a rotation center.

  The exciting coil 35 is formed by winding a conductive metal wire such as copper around a bobbin 35a made of a synthetic resin of a cylindrical body having a through hole having a rectangular cross-sectional shape, and is provided on the bobbin 35a. It is connected to the control means via a terminal 35b.

  The housing 38 is made of a synthetic resin, and is formed of a first frame 39a positioned on the upper side and a second frame 39b positioned on the lower side, as shown in FIG. 4, and these first and second frames are formed. A space is formed between the bodies 39a and 39b as a storage portion S for storing the drive internal unit, and the first and second rotary shafts 36a and 36b and the output shaft 37 are supported, and a part of the output shaft 37 is a housing. 38 protrudes to the outside.

  The second frame 39b is integrally provided with a second protrusion 392 at a position where it abuts on the first protrusion 391 provided on the output gear 34. The rotation is stopped at a predetermined position.

An arcuate housing portion 380 corresponding to the rotation path of the light receiving portion 14 is formed around the output shaft of the housing 38. The housing portion 380 accommodates the output gear 34 therein, and when the drive device 3 is observed from above the pointer shaft 37 (in the axial direction), the entire shape forms a circular arc portion. The first wall 381 facing the pointer 1 (in this case, formed on the first frame 39a) and the second wall 382 adjacent to the light source 5 (in this case, the second frame 39b) And an inclined portion 383 (in this case, formed on the first frame 39a) formed between the first wall portion 381 and the second wall portion 382. ing.

  2 and 4, the inclined portion 383 has a shape in which the corner portion of the housing portion 380 is cut obliquely so as not to block the illumination light traveling from the light source 5 to the light receiving portion 14, that is, the pointer shaft 37. Is formed so as to have a conical shape obtained by rotating a linear slope.

  The circuit board 4 is a well-known hard circuit board, is equipped with a control means (not shown) for driving and controlling the driving device 3 and the light source 5, and is arranged behind the driving device 3.

  The light source 5 includes a light emitting element such as an LED, and includes a pointer light source 51 and a display panel light source (not shown). The pointer light source 51 receives the illumination light so that the illumination light enters from the light receiving portion 14 provided in the rotation center portion 12 and is reflected toward the pointer main body 11 by the reflection portion 15 also provided in the rotation center portion 12. Arranged along the orbital range of the portion 14.

  Thus, in this embodiment, the pointer 1 that receives light from the light receiving portion 14 provided in the rotation center portion 12 and emits light, and the pointer shaft 37 that drives the pointer 1 protrude from the housing 38 to the front side. A driving device 3; a circuit board 4 arranged on the rear side of the driving device 3; and a light source 5 arranged on the front side of the circuit board 4 for supplying illumination light to at least the pointer 1. Has an arcuate housing portion 380 corresponding to the rotational trajectory of the light receiving portion 14 around the pointer shaft 37 of the housing 38, and a plurality of light sources 5 are arranged on the circuit board 4 along the arc shape of the housing portion 380. In the pointer-type measuring instrument device, the housing portion 380 has a first wall portion 381 that faces the pointer 1 and a second wall portion 382 that is adjacent to the light source 5, and the first wall portion 381 and the first wall portion 381. Between the two wall portions 382 By providing the inclined portion 383, the illumination light blocked by the housing 38 of the drive device 3 can be reduced, so that the illumination light of the light source 5 can be easily received by the light receiving portion 14, and the pointer 1 can be efficiently illuminated. It becomes possible to do.

Moreover, the arrangement | positioning diameter which arrange | positions the light source 5 can be made small, and the light-receiving part 14 of the pointer 1 and the pointer cap 13 can also be reduced in size.

The front view of the drive device by one Embodiment of this invention. 1 is a cross-sectional view of a pointer-type instrument device according to an embodiment of the present invention. The top view of the state which removed the upper case of the drive device by one Embodiment of this invention. 1 is a cross-sectional view of a drive device according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pointer 2 Display board 3 Drive apparatus 4 Circuit board 5 Light source 6 Case body 11 Pointer body 12 Rotation center part 13 Pointer cap 14 Light-receiving part 15 Reflection part 21 Opening part 31 Rotor magnet 31a Through-hole 32 Rotor gear 32a First gear 32b Second gear 33 Intermediate gear 34 Output gear 35 Excitation coil 35a Bobbin 35b Terminal 36a First rotating shaft 36b Second rotating shaft 37 Output shaft (pointer shaft)
38 Housing 39a First frame 39b Second frame 51 Pointer light source 380 Housing portion 381 First wall portion 382 Second wall portion 383 Inclined portion 391 First protrusion portion 392 Second protrusion portion S Part

Claims (1)

A pointer that emits light by receiving light from a light receiving portion provided at the center of rotation;
A driving device in which a pointer shaft for driving the pointer protrudes forward from the housing;
A circuit board disposed on the rear side of the driving device;
A light source disposed on the front side of the circuit board and supplying illumination light to at least the pointer,
The drive device has an arcuate housing portion corresponding to a rotation trajectory of the light receiving portion around the pointer shaft of the housing, and the light source is placed on the circuit board along the arc shape of the housing portion. In the pointer-type instrument device arranged in plurality, the housing portion has a first wall portion facing the pointer and a second wall portion adjacent to the light source, and the first wall portion and the first wall portion A pointer-type instrument device characterized in that an inclined portion is provided between the two wall portions.

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