JP5228260B2 - Indicating instrument - Google Patents

Description

  The present invention relates to an indicating instrument mounted on, for example, an automobile or a motorcycle, and more particularly, to an indicating instrument of a type having a display member at a central portion in a rotating track of a pointer.

  As this type of indicating instrument, for example, the one described in Patent Document 1 below is known. The indicating instrument includes a driving device in which a pointer shaft is protruded, a display plate disposed in front of the driving device and having an indicator portion, a rotation base connected to the pointer shaft, and an indicator portion that indicates the indicator portion. A pointer made of a light-transmitting material, a case body that supports the display panel from behind and has a space corresponding to the rotation base, and a plurality of light sources arranged in the space so as to correspond to the rotation base, A cylindrical light guide is disposed between the light source and the rotating base so as to surround the pointer shaft and guides the light from the light source to the rotating base and emits the indicator. The inner wall portion of the light guide is formed with a protrusion (first engagement portion) that protrudes toward the pointer shaft side, while the case body extends to the rotation base side along the inner wall portion of the light guide. A cylindrical portion is formed, and a locking portion (second engaging portion) that engages with the protruding portion is provided on the cylindrical portion, and the protruding portion of the light guide is engaged with the engaging portion of the case body. Thus, the light guide is attached to the case body.

JP 2001-31633 A

  However, in the indicating instrument described in Patent Document 1, since the light guide is attached to the case body by engaging the protrusion of the light guide with the engaging portion of the case body, the dimensional error of components and heat There is a concern that the protrusion between the light guide and the engagement portion of the case body may be disengaged or rattle due to influences or the like.

  Therefore, the present invention pays attention to the above-described problems, and an object thereof is to provide an indicating instrument capable of preventing disengagement and rattling of the light guide body and the case body.

The present invention relates to a drive device having a pointer shaft projecting, a display plate disposed in front of the drive device and having an indicator portion, a rotation base connected to the pointer shaft, and an indicator portion for indicating the indicator portion A pointer made of a translucent material, a case body that supports the display plate from behind and has a space corresponding to the rotation base, and is disposed in the space so as to correspond to the rotation base. A light source, and a light guide disposed between the light source and the rotating base so as to surround the pointer shaft and guiding the light of the light source to the rotating base and causing the indicator to emit light. In the indicating instrument in which the light guide is attached to the case body by engaging a first engagement portion provided on the light body with a second engagement portion provided on the case body, the light guide body The first engagement portion is provided on an outer peripheral portion of the case, and the case Said facing wall that faces provided on the outer peripheral portion, the second engagement portion to the opposite wall is provided, the opposing wall the opposing walls so as to suppress the deformation of the opposite walls counter light side of the periphery of the An attachment member having an inner wall peripheral wall portion that presses the pointer toward the pointer shaft side is provided.

Further, the present invention is characterized in that the mounting member has a holding portion for preventing the display plate from being lifted from the case body.
By configuring in this way, it is not necessary to provide a dedicated part for preventing the display plate from being lifted, so that cost reduction can be achieved.

Further, the present invention is characterized in that the attachment member has an elastic hook, and the case body is provided with a receiving portion for attaching the attachment member to the case body by engaging the elastic hook.
By comprising in this way, attachment of an attachment member can be made easy.

  ADVANTAGE OF THE INVENTION According to this invention, the indicating instrument which can prevent disengagement and backlash of a light guide and a case body can be provided.

The front view of the indicating instrument by one Embodiment of this invention. Sectional drawing of FIG. 1 (hatching is abbreviate | omitted). The principal part enlarged view of FIG. 2 (hatching is abbreviate | omitted). The perspective view which shows the attachment member single-piece | unit in the embodiment. The principal part perspective view at the time of removing the display board and the attachment member in the same embodiment.

  An indicating instrument according to an embodiment of the present invention is, for example, a vehicle speedometer, and includes a circuit board 1, a driving device 2, a case body 3, a display board 4, a pointer 5, a light guide body 6, and an attachment. And a member 7.

  The circuit board 1 is made of a hard wiring board obtained by printing a circuit pattern (not shown) on an insulating member such as paper phenol or glass epoxy, and the driving device 2 is fixedly supported, and is made of, for example, a light emitting diode. A plurality of light sources L for illuminating the pointer 5 and various circuit elements (not shown) are mounted. In this case, a plurality of light sources L for illuminating the pointer 5 are arranged at appropriate intervals so as to surround a pointer shaft 21 (to be described later) of the driving device 2.

  The drive device 2 is formed of, for example, a stepping motor, and includes a pointer shaft 21 that is fixedly disposed on the back side of the circuit board 1 and penetrates the circuit board 1.

  The case body 3 is made of, for example, milky white synthetic resin and is disposed on the front side of the circuit board 1 to support the display board 4 from behind. The case body 3 also has a function as a reflecting member that guides light from the light source L to the display plate 4 and the pointer 6. Further, the case body 3 includes a cylindrical portion 31, a receiving wall 32, and an opposing wall 33, and the cylindrical portion 31, the receiving wall 32, and the opposing wall 33 form a portion having a cross-section “H” shape. Forming.

  The cylindrical portion 31 is formed in a cylindrical shape extending along the direction of the pointer shaft 21 corresponding to a rotation base portion of the pointer 5 which will be described later.

  The receiving wall 32 extends in parallel with the circuit board 1 from the middle of the inner peripheral wall of the cylindrical portion 31 in the direction of the pointer shaft 21, and a through hole 34 is formed through which an elastic hook described later of the mounting member 7 passes. A receiving portion 35 with which an elastic hook engages is formed at the rear periphery of the through hole 34.

  The opposing wall 33 defines a space for disposing the light source L and the light guide 6 in the case body 3 so as to correspond to a rotation base portion of the pointer 5 to be described later, and the entire wall 33 rotates along the pointer shaft 21. It has a cylindrical shape extending to the base side. As shown in FIG. 5, a plurality of slits 36 are formed in the facing wall 33, and one of a plurality of flange portions (to be described later) of the light guide 6 is positioned through the slits 36 and the other flange portions are received. Mounted on the wall 32. Moreover, the slit 36 makes the opposing wall 33 bend easily.

  Of the opposing wall 33 divided by the slit 36, the opposing wall 33 corresponding to a later-described protrusion of the light guide 6 has an engaging portion (second engaging portion) protruding toward the pointer shaft 21 side. 37 is formed.

  The display board 4 is composed of a well-known print panel provided with an index portion 41 such as a scale or a character to be indicated by the pointer 5 by performing screen printing on a transparent substrate made of a synthetic tree species and the background thereof. An opening 42 corresponding to the rotation base is formed.

  The pointer 5 is made of, for example, a translucent synthetic resin. The pointer 5 includes a rotation base 51 that is connected to the pointer shaft 21 and an instruction unit 52 that indicates the index unit 41, and a light shielding cover 53 that covers the periphery of the rotation base 61. doing. The light shielding cover 53 is configured not to cover the back surface of the rotation base 51. The rotation base 51 is formed with a reflection unit (not shown) that receives light from the light source L and reflects the light toward the instruction unit 52 side.

The light guide 6 is made of, for example, a translucent synthetic resin, and is disposed between the light source L and the rotation base 51.
The light guide 6 has a cylindrical shape (annular shape) surrounding the pointer shaft 21, and the back surface thereof faces the light source L. The six light guides facing the rotation base 51 have a plurality of convex lens portions 61, and one convex lens 61 corresponds to one light source L.

  Since the light guide 6 has a cylindrical shape surrounding the pointer shaft 21 as described above, the inner peripheral portion 62 that forms a cylindrical surface through which the pointer shaft 21 passes is positioned opposite to the radially outer side of the inner peripheral portion 62. The outer peripheral part 63 which forms the cylindrical surface which faces the wall 33 is formed, and the outer peripheral part 63 is formed with a plurality of flange parts 64 and 65 and a protruding part (first engaging part) 66, respectively. (See FIG. 5).

  A plurality of flange portions 64 and 65 are formed as projecting pieces protruding outward in the radial direction, abut against the front surface of the receiving wall 32, and position the light guide 6 in the axial direction of the pointer shaft 21. Of these, the flange portion 64 positions the light guide 6 in the circumferential direction by being fitted in the slit 36 as well as in the axial direction.

  The protruding portion 66 protrudes toward the opposing wall 33 that is opposite to the pointer shaft 21 side, and engages with the engaging portion 37 of the case body 3.

  The mounting member 7 is made of, for example, a light-shielding synthetic resin, and is formed on a cylindrical outer peripheral wall portion 71 along the inner wall of the cylindrical portion 31, a disk-shaped bottom wall portion 72 along the receiving wall 32, and an outer wall of the opposing wall 33. A cylindrical inner peripheral wall portion (regulating portion) 73 is provided.

  An end portion of the outer peripheral wall portion 71 is formed with an annular flange-shaped holding portion 74 that is bent from the outer peripheral wall portion 71 and extends along the front surface of the display panel 4. The restraining portion 74 prevents the display plate 4 from being lifted from the case body 3 when the attachment member 7 is attached to the case body 3.

  An elastic hook 75 having a engaging portion at the tip protrudes from the rear surface of the bottom wall portion 72 and corresponds to the through hole 34, and the elastic hook 75 engages with the receiving portion 35. Thus, the attachment member 7 is attached and fixed to the case body 3.

  The inner peripheral wall portion 73 presses the opposing wall 33 toward the light guide 6 (pointer shaft 21) when the attachment member 7 is attached, or the outer circumferential direction in which the opposing wall 33 is separated from the light guide 6 (anti-light guide). Suppress deformation to the body side.

Next, attachment of the light guide 6 and the attachment member 7 will be described.
The light guide 6 is attached before the pointer 5 is attached to the pointer shaft 21, and the light guide 6 is inserted into the opposing wall 33 while passing the hollow portion of the light guide 6 through the pointer shaft 21 from the front side. When the flange portions 64 and 65 are in contact with the front surface of the receiving wall 32 and the projection portion 66 engages with the engagement portion 37 in a state where the flange portion 64 is fitted in the slit 36, the attachment is completed. At this time, since the inclined surface is formed in each of the protrusion 66 and the engaging portion 37, smooth insertion is possible.

  The attachment member 7 is attached after the light guide 6 is attached, and the attachment member 7 is inserted into the cylindrical portion 31 from the front side, and the holding portion 74 is in contact with the periphery of the opening 42 of the display plate 4. The attachment member 7 is attached and fixed to the case body 3 by the elastic hook 75 engaging with the receiving portion 35. As a result, the inner peripheral wall portion 73 presses the opposing wall 33 toward the pointer shaft 21 and prevents disengagement or rattling.

  As described above, in the present embodiment, the drive device 2 formed by projecting the pointer shaft 21, the display plate 4 disposed in front of the drive device 2 and having the indicator portion 41, and the rotation connected to the pointer shaft 21. A pointer 5 made of a translucent material having a base 51 and an indicator 52 for indicating the indicator 41; a case body 3 that supports the display panel 4 from the back and has a space corresponding to the rotating base 51; A plurality of light sources L arranged so as to correspond to the rotation base 51 in the space, and the light of the light source L arranged around the pointer shaft 21 between the light sources L and the rotation base 51 to the rotation base 51. A light guide 6 that guides the indicator 52 to emit light, and a protrusion (first engagement portion) 66 provided on the light guide 6 is provided with a locking portion (second engagement) provided on the case body 3. The light guide 6 is attached to the case body 3 by engaging with the joint portion 37. In the indicating instrument, the outer peripheral portion 63 of the light guide 6 is provided with a projection 66 that protrudes on the side opposite to the pointer shaft 21 side, and the case body 3 is provided with an opposing wall 33 that faces the outer peripheral portion 63. In the mounting member 7, a locking portion 37 that protrudes toward the pointer shaft 21 is provided, and a mounting member 7 that suppresses deformation of the opposing wall 3 toward the anti-light guide body is provided around the opposing wall 33. It is possible to prevent the opposing wall 33 from being deformed to the side opposite to the light guide body, and to prevent disengagement or rattling between the light guide body and the case body.

  Further, in this embodiment, since the mounting member 7 has the holding portion 74 that prevents the display plate 4 from lifting from the case body 3, it is not necessary to provide a dedicated component for preventing the display plate 4 from lifting, thereby reducing the cost. Can be achieved.

  In the present embodiment, the attachment member 7 has the elastic hook 75, and the case body 3 is provided with the receiving portion 35 for attaching the attachment member 7 to the case body 3 by engaging the elastic hook 75. Attachment of the attachment member 7 can be facilitated.

  In the present embodiment, the protrusion (first engagement portion) 66 is formed so as to protrude on the opposite wall 33 side opposite to the pointer shaft 21 side, and the locking portion (second engagement portion) 37 is formed. Although it is formed so as to protrude toward the pointer shaft 21, the shape of each engaging portion is arbitrary, and for example, either one may be a stepped portion.

  Further, in the present embodiment, the inner peripheral wall portion 73 is a restricting portion that suppresses deformation of the opposing wall 33 toward the anti-light guide, but the shape of the restricting portion is also arbitrary.

DESCRIPTION OF SYMBOLS 1 Circuit board 2 Drive apparatus 3 Case body 4 Display board 5 Pointer 6 Light guide 7 Mounting member 21 Pointer shaft 31 Tube part 32 Receiving wall 33 Opposite wall 34 Through-hole 35 Receiving part 36 Slit 37 Locking part (2nd engagement) Joint)
DESCRIPTION OF SYMBOLS 41 Index part 42 Opening part 51 Rotation base part 52 Instruction part 53 Light shielding cover 61 Convex lens part 62 Inner peripheral part 63 Outer peripheral part 64,65 Flange part 66 Projection part (1st engaging part)
71 Outer peripheral wall portion 72 Bottom wall portion 73 Inner peripheral wall portion (regulating portion)
74 Holding part 75 Elastic hook L Light source

Claims (3)

A driving device having a pointer shaft projecting therefrom, a display plate disposed in front of the driving device and having an indicator portion, a rotating base connected to the pointer shaft, and an indicating portion for indicating the indicator portion. A pointer made of an optical material, a case body that supports the display plate from behind and has a space corresponding to the rotation base, a light source disposed in the space so as to correspond to the rotation base, and A light guide disposed between the light source and the rotating base so as to surround the pointer shaft and guiding the light of the light source to the rotating base and causing the indicator to emit light, and is provided in the light guide In the indicating instrument in which the light guide is attached to the case body by engaging the first engagement portion with the second engagement portion provided on the case body, the outer peripheral portion of the light guide body The first engaging portion is provided, and the case body is provided with the outer portion. The opposing wall is provided opposite to the part, the second engaging portion provided on the opposite wall, the pointer to the opposite wall so as to suppress the deformation of the counter-light side of the opposing walls around the opposing walls An indicating instrument comprising an attachment member having an inner wall peripheral wall portion that presses toward the shaft side . The indicating instrument according to claim 1, wherein the attachment member includes a holding portion that prevents the display plate from being lifted from the case body. The instruction according to claim 1, wherein the attachment member has an elastic hook, and the case body is provided with a receiving portion for attaching the attachment member to the case body by engaging the elastic hook. Instrument.

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