JP5536564B2 - Instrument lighting structure - Google Patents

Description

  The present invention relates to an illumination structure for a meter that can attach a substantially rod-shaped light guide member for illuminating a dial of a meter such as a speedometer or a tachometer of an automobile with one touch.

  Conventionally, various lighting structures have been proposed in order to illuminate a dial in an instrument such as an automobile speedometer or tachometer.

  For example, in Patent Document 1, a latching claw that protrudes in reverse is engaged with a notch portion between a dial and a light guide plate on the back side thereof, and a gap is provided between the dial and the reverse, and the back side of the light guide plate An internal unit (driving unit) is arranged on the back of the internal unit, and the dial is illuminated by reflecting back the emitted light from the light source provided on the meter case side of the internal unit.

  Further, in Patent Document 2, a tapered reflecting surface is provided on a case, an annular light guide member is disposed in an opening at the center of the reflecting surface, and is fixed to a fixing claw integrated with the case. The shaft of the pointer passes through the center hole and is connected to the movement (drive unit) on the back side of the wiring board. A light source (LED) on the wiring board is provided close to the back side of the light guide member, and the light emitted from the light source is emitted. It is described that the light guide member guides to the reflection surface.

  Further, in Patent Document 3, the light guide plate is disposed on the lower side of the case, the rear end portion of the light guide plate is in contact with the light source, the front end portion of the light guide plate is bent upward in front of the transparent cover, and is used as a reflection surface. It is described that light from a light source is reflected obliquely upward on a reflecting surface through a light guide plate and irradiated on a dial.

JP-A-9-236457 (FIG. 4) JP 2009-294076 A (FIG. 1) Japanese Patent Laid-Open No. 10-239114 (FIGS. 1 and 2)

  However, in the illumination structure of the instrument described in the above-mentioned conventional patent document 3, or in the instrument 71 as shown in FIG. 6, for example, a rod-shaped light guide member (not shown) is arranged on the upper side 72 a of the instrument 71. When the light emitted from the light source on the circuit board on the back side of the dial plate 73 is guided to the light guide member to illuminate the dial surface from the opening of the upper part 72a, the light guide member is fixed by screws. It has to be done through tightening or other members, and the workability of mounting the light guide member is poor, which causes a problem that it takes a lot of time to mount the light guide member.

  In FIG. 6, reference numeral 72 is a look back, 72 a is a top look, 74 is a transparent front cover (front glass), 73 is a dial, 75 is a pointer, 76 is a trip knob, and 77 is a winker display section. A shift indicator (not shown) is arranged on the right side of the section 77, and a tachometer (not shown) is arranged on the right side thereof.

  In view of the above-described points, the present invention provides, for example, a rod-shaped light guide member on the outer side of the dial of the instrument, and guides the light emitted from the light source on the circuit board on the back side of the dial to the light guide member. An object of the present invention is to provide an illumination structure for a meter that can easily attach a light guide member with good workability even when the dial surface is illuminated.

In order to achieve the above object, the illumination structure for a meter according to claim 1 of the present invention is such that a light guide member is disposed on the outer surface side of the counterfeit of the meter, and the light guide member is inserted into the case from the hole of the counterfeit. In a lighting structure of a meter that inserts a rear end portion, guides light from the light source in the case to the front end portion side of the light guide member, and illuminates the dial from the opening of the turning light, the light guide member includes front and rear A rod-shaped light guide member main body that is long in the direction, a flange provided on the rear end side of the light guide member main body, and abutting on the periphery of the hole, and provided on the front end side of the light guide member main body A locking portion that engages with the locked portion of the head, a positioning portion that engages with the positioned portion of the head, and a support portion that supports the head. the equipped, in a state where the rear end portion of the light guide member body the collar portion is inserted into the hole portion is in contact with the periphery of the hole portion, conductor to fulcrum the collar portion By rotating the front end side of the member body toward the opening, the locked portion is engaged with the locking portion, the positioned portion is engaged with the positioning portion, and the head is It is supported by the support portion .

With the above configuration, the rear end portion of the light guide member main body is inserted into the facing hole portion, and the flange portion is in contact with the peripheral edge of the hole portion, so that the longitudinal direction (front-rear direction) of the light guide member is positioned. In this state, the head portion of the light guide member is pressed toward the facing support portion, so that the positioned portion of the head is positioned and positioned, and the locked portion of the head is smoothly and securely The head is securely locked and in this state, the head is stably supported by the support portion. The light guide member main body is transparent (translucent), but the head and the collar need not be transparent. The light emitted from the light source is guided in the longitudinal direction of the light guide member from the rear end of the light guide member main body, reflected by the inclined reflecting surface on the front end side, and illuminates the dial from the facing opening. Guiding member head while turning toward the support portion as a fulcrum the flange portion is positioned by the positioning unit Ru is locked by the locking portion.

  The illumination structure of the instrument according to claim 2 is the illumination structure of the instrument according to claim 1, wherein the locked portion is an opening, the locking portion is a pair of left and right locking claws, and the positioned portion Is a pair of left and right ribs, the positioning portion is a protruding plate that enters between the ribs, and the support portion includes a wall portion that engages with a left and right concave groove of the head. .

  With the above configuration, the protruding plate enters and engages between the pair of ribs on the left and right sides of the head, that is, in the light guide member width direction (short direction), and the head is positioned in the left and right directions and locked to the opening of the head. The claw enters and engages, and at the same time, the wall portion of the support portion engages with a concave groove extending in the left-right direction of the head (in the transverse direction), so that the head is positioned in the front-rear direction and vertically Is supported stably.

  The illumination structure of the meter according to claim 3 is the illumination structure of the meter according to claim 1 or 2, wherein the light guide member main body and the collar portion are guided in the return from the hole portion to the support portion. In addition, a pair of left and right guide walls is provided.

  With the above configuration, the rear end portion of the light guide member main body is inserted into the hole while the flange portion is smoothly guided along the inner surfaces of the pair of guide walls, and the light guide member main body is aligned along the inner surfaces of the pair of guide walls. The head is roughly positioned toward the support portion while being smoothly guided. Since the light guide member main body is accommodated in the pair of guide walls, light leakage to the outside is prevented. The pair of guide walls includes a portion having a wide internal space with respect to the flange portion and a portion having a narrow internal space with respect to the light guide member main body.

  According to the first aspect of the invention, the light guide member is positioned in the longitudinal direction by inserting the rear end portion of the light guide member into the reverse hole portion and bringing the collar portion into contact with the peripheral edge of the hole portion. In this state, by pressing the head toward the support portion, the head can be smoothly and reliably engaged with the locking portion while the head is positioned by the positioning portion. Can be easily and reliably performed with good workability.

  According to the second aspect of the invention, the head is positioned in the left-right direction by the engagement between the pair of ribs and the protruding plate, that is, centered, and in this state, the locking claw is smoothly and reliably engaged with the opening of the head. At the same time, by engaging the wall portion of the support portion with the concave groove in the transverse direction, the head portion can be stably supported in the vertical direction while positioning the head portion in the front-rear direction. Can do. Thereby, the positioning and locking of the head can be improved.

  According to the invention of claim 3, by guiding the light guide member so as to be inserted into the pair of guide walls, the rear end portion of the light guide member main body can be smoothly and easily inserted into the reversing hole portion. In addition, the head portion can be smoothly positioned in the left-right direction with respect to the support portion and the like, and the assembling property of the light guide member to the reverse can be improved.

It is a longitudinal cross-sectional view which shows one Embodiment of the illumination structure of the meter which concerns on this invention. It is a disassembled perspective view which shows the principal part of the illumination structure of a meter. It is a longitudinal cross-sectional view before the light guide member assembly | attachment which shows the principal part of the illumination structure of a meter. It is a longitudinal cross-sectional view after the light guide member assembly | attachment which shows the principal part of the illumination structure of a meter. The form of the assembly | attachment structure of the head of a light guide member is shown, (a) is a front view, (b) is a top view. It is a front view which shows the external appearance of one form of the meter for existing cars.

  1 to 5 show an embodiment of an illumination structure of a meter according to the present invention.

  As shown in FIG. 1, the lighting structure of this instrument is provided with a turn 3 on the front side of the case 2, a transparent cover 4 on the front of the turn 3, and a dial 5 between the case 2 and the turn 3. The circuit board 6 and the drive unit 7 on the back side of the case 2 are disposed at the rear of the case 2, the pointer 8 is disposed on the front side of the dial 5, and the shaft 9 of the pointer 8 is connected to the drive unit 7. The drive unit 7 and the circuit board 6 are covered with a back cover 10, and a transparent substantially rod-shaped light guide member 12 is mounted on the upper side (outer side) of the upper wall 11 along the upper surface of the inclined upper wall 11 of the facing 3. Then, the base end (rear end) 13 a of the light guide member 12 is brought close to the light source 14 on the upper surface of the circuit board 6, and the front end portion (tip end portion) 15 of the light guide member 12 is turned back into the opening 16 of the upper wall 11. The light emitted from the light source 14 is guided from the base end 13a of the light guide member 12 to the front end 15 and irradiated from the front end 15 to the dial plate 5. , It is in the instrument 1 so as to illuminate the dial plate 5.

  That is, hole portions (openings) 19 and 20 are provided in communication with the vertical wall 17 at the upper rear side of the turn 3 and the vertical wall 18 at the upper upper portion of the case 2, and the rod-shaped light guide member main body 21 of the light guide member 12. The light guide member 12 is made to penetrate the rear end portion 13 through the holes 19 and 20, and the flange portion 22 provided in the light guide member main body 21 is brought into contact with the front surface of the vertical wall 17 that is the periphery of the hole portion 19. The head 23 having a substantially rectangular shape on the front end side thereof is looked back and is fixed stably and easily on the front upper side (outside) of the upper wall 11 with positioning means, locking means and support means (reference numerals will be described later). It is characterized by.

  As the instrument 1, a speedometer, a tachometer, or the like in the automobile combination meter shown in FIG. 6 of the conventional example is suitable. In FIG. 1, the circuit board 6 is housed in the rear part of the case 2 and is covered and protected by the rear cover 10, and the case 2 has a front curved wall 24 around the shaft part 9 of the pointer 8. The curved wall 24 has an opening 25 in the center, a light source (LED) 26 for pointer illumination on the surface side of the circuit board 6 is disposed in the opening 25, and a transparent (translucent) tube around the shaft portion 9. The guide 8 has a light-impermeable cap portion 28 following the shaft portion 9.

  The circuit board 6 is supported by the step portions of the upper and lower horizontal wall portions 29 and 30 of the case 2 and the rear end of the horizontal wall portion 31 that extends orthogonally to the lower side of the upper vertical wall 18, and the horizontal wall. A light source (LED) 14 for illumination is positioned above the portion 31, and the hole 20 of the upper vertical wall 18 is a space 32 surrounded by upper and lower horizontal wall portions 29, 31 and the upper portion of the circuit board 6 behind. The rear end portion 13 of the light guide member main body 21 of the light guide member 12 is inserted into the space 32 through the holes 19 and 20.

  The upper vertical wall 17 of the turn-back 3 is penetrated and locked to the frame piece 34 of the upper wall 29 of the case 2 by a horizontal claw portion 33, and a character is formed on a step portion on the front end side of the upper horizontal wall 31 and the lower wall 30 of the case 2. The plate 5 is disposed, and the upper and lower ends of the dial plate 5 are sandwiched between the rear end portion of the upper wall 11 of the facing plate 3 and the lower lower wall 35 of the facing plate 3 between the step portions, and the front cover 4 is inclined. The upper horizontal claw portion 36 penetrates and is locked to the front frame piece 37 of the upper wall 11 and the lower horizontal claw portion 38 passes through the lower lower wall 35 and passes through the lower wall 35. The frame piece 39 of the wall 30 is penetrated and locked. The case 2, the facing 3, the covers 4, 10, the dial 5, the pointer 8, and the light guide member 12 are made of synthetic resin.

  2 and 3, the light guide member 12 includes a rear end portion (base end portion) 13 curved downward, an intermediate portion 40 extending straight in the horizontal direction, and a front end portion (front end portion) curved downward. ) 15, a rod-shaped light guide member main body 21, a vertical flange 22 fixed between the rear end portion 13 and the intermediate portion 40 (boundary portion) of the light guide member main body 21, The head part 23 is located between the middle part 40 (boundary part) and the front of the front end part 15 and is continuous with the front end part 15. The light guide member main body 21 is transparent (translucent), but the collar portion 22 and the head portion 23 do not have to be transparent.

  The rear end portion 13 of the light guide member body 21 is formed in a rectangular cross section with the same cross-sectional area as the intermediate portion 40, and the rear end surface 13a is inclined from the upper surface 13b to the lower surface 13c of the rear end portion 13 so as to be vertical when mounted. ing. The front end portion 15 of the light guide member main body 21 forms a reflecting surface 15a with the upper surface 15a inclined more steeply than the lower surface 15b so that the thickness in the vertical direction gradually becomes thinner as shown in FIG. The light is reflected obliquely backward and downward by the reflecting surface 15a. A front end (lower end) 15 c of the front end portion 15 is integrally connected to a vertical rear wall 41 that hangs downward from the head 23.

  As shown in FIGS. 2 and 5B, the head portion 23 extends rearward from the vertical rear wall 41 on the left and right sides of the front end portion 15 of the light guide member body 21 to the boundary between the front end portion 15 and the intermediate portion 40. A pair of left and right side walls 42, a rectangular opening 43 that is formed between the pair of side walls 42 as shown in FIG. 2 and accommodates the reflecting surface 15a, and a horizontal portion extending forward at the top of the vertical rear wall 41. 2 and 3, a rectangular locking opening (locked portion) 45 provided on the plate wall 44, and the rear end lower portion is orthogonal to the left and right ends of the plate wall 44. A pair of left and right vertical plate portions 46 that follow the front end of the ridge wall 42, and a reinforcing rib 47 that is inclined from the rear ends of the left and right plate portions 46 along the upper surface of the horizontal ridge wall 42 that is horizontal. And a pair of left and right parallel positioning ribs (positioned portions) 48 suspended from the lower surface of the central portion of the horizontal plate wall 44; Is obtained by a groove 49 for positioning and supporting provided by notches in the vertical direction along the rear wall 41 at the proximal end (rear end) the lower portion of the rib 48 of the pair.

  As shown in FIG. 3, the pair of ribs 48 are connected and reinforced with horizontal wall portions 44 and 50 at the top and bottom of the front end. The vertical rear wall 41 following the front end of the light guide member main body 21, the horizontal wall portion 50 having the concave groove 49 on the lower side, the vertical rib 48, the rear flange portion 22 and the like are formed by upper and lower molding dies ( (Not shown) at the same time.

  As shown in FIGS. 2 and 5, a gap 51 for positioning engagement is formed between the pair of ribs 48. A pair of ribs 48 forming the gap 51 functions as positioning means. The opening 45 of the horizontal plate wall 44 is formed wider outside the pair of ribs 48, and the left and right ends of the opening 45 are positioned in front of the inner surfaces of the left and right plate portions 46. A locking edge 44 a is provided on the upper surface of the plate wall 44 between the inner surface and the inner surface. The opening edge 44a functions as a locking means. Further, the concave groove 49 functions as a positioning / supporting means.

  As shown in FIGS. 2 and 3, the vertical collar portion 22 on the rear side of the light guide member 12 has an upper half portion 22 a located rearward and a lower half portion 22 b located forward, and the upper half portion 22 a and the lower half portion. 22b is disposed so as to be displaced forward and backward via a step 22c. This corresponds to the shape of the turnover 3 on the assembly side. 2 and 3, an example will be described in which the inclined upper wall 11 of the turning 3 in FIG. 1 is a horizontal upper wall 11.

  As shown in FIGS. 2 and 3, the upper vertical wall 17 raised at the rear end of the upper wall 11 of the facing 3 is provided with a rectangular hole 19 and protrudes backward from the upper end of the upper vertical wall 17. 33 is engaged with the frame piece 34 of the case 2. On the left and right sides of the hole 19, a pair of left and right short rear guide walls 52 are erected on the upper wall 11 perpendicular to the upper vertical wall 17 with a wide gap, and the rear guide wall 52 is Following the pair of left and right long guide walls 53 that form a narrow gap on the front side through the inward wall portion 52a at the front end, the lower front end of the long guide wall 53 is inclined obliquely upward from the upper wall 11 Crossing the wall portion 54, the front end wall 54 a of the inclined wall portion 54 is bent in parallel with the upper wall 11.

A pair of left and right rear walls 55 is erected on the upper surface of the front end wall 54a of the inclined wall portion 54, and the pair of rear walls 55 is a rectangular frame-like frame wall (with front left and right and front side walls 56, 57 ). 3), the three wall portions 55 to 57 are erected on the upper wall 11, and the upper end of the frame wall 58, which is the four wall portions of this example as shown in FIG. To position. As shown in FIG. 2, the left and right side walls 54 b of the inclined wall portion 54 continue to the rear ends of the left and right wall portions 56 of the frame wall 58. A front end portion 54 a of the inclined wall portion 54 slightly protrudes from the upper portion of the space in the frame wall 58, and a thin plate-like bottom wall 59 is provided at the lower front half in the frame wall 58, and the bottom wall 59 is integrated with the upper wall 11. Subsequently, the front end wall 54a and the bottom wall 59 of the inclined wall portion 54 are positioned stepwise up and down, and an opening 16a is formed in a step shape between the front end wall 54a and the bottom wall 59, as shown in FIG. Communicates with the wide opening 16 of the upper wall 11, and the wide opening 16 is located below the inclined wall portion 54.

  As shown in FIG. 2, a pair of left and right locking claws (locking portions) 60 are erected on the thick portion 11a of the upper wall 11 in front of the front wall (wall portion) 57 of the frame wall 58, and the locking claws 60 are allowed. It is composed of a flexible (elastic) plate piece 60a and a claw portion 60b protruding outward from the upper portion of the plate piece 60a. A positioning projecting plate (positioning portion) 61 is erected vertically to the thick portion 11 a of the upper wall 11 slightly in front of the pair of locking claws 60.

  As shown in FIG. 3, the locking claw 60 protrudes higher than the frame wall 58, and the protruding plate 61 protrudes at the same height as the frame wall 58. The front protruding plate 61 is located on the center line of the frame wall 58 (the center in the left-right direction), and the center line (the center in the left-right direction) between the pair of left and right guide walls 52, 53 and the frame wall 58 coincides with each other on the center line. The rear hole 19 is located at the rear. The upper wall 11, the inclined wall portion 54, the frame wall 58, the locking claw 60, the projecting plate 61, and the opening 16 are simultaneously resin-molded by the upper and lower molding dies for the turning 3.

  As shown in FIG. 3, the rear end portion (base portion) 13 of the light guide member 12 is looked back in a posture in which the light guide member 12 is inclined forward (rearward). 4, the flange 22 on the rear end 13 side is brought into contact with the front surface of the vertical wall 17, and then the head 23 side of the light guide member 12 is pushed downward, as shown in FIG. While inserting the engaging claw 60 on the facing side 3 into the opening 45 in the front half, the protruding side plate 61 on the facing side is inserted between the pair of positioning ribs 48 at the lower front end of the head 23, and at the same time the head 23 The pair of flange walls 42 in the latter half of the frame are supported by the upper ends of the frame walls 58 on the facing side, and the upper part of the front wall 57 of the frame wall 58 is entered and engaged with the concave groove 49 at the boundary between the flange wall 42 and the rib 48.

  The contact of the flange portion 22 with the vertical wall 17 of the turning 3 is performed first from the upper half flange portion 22a, and the head portion 23 side of the light guide member 12 is rotated downward with the upper half flange portion 22a as a fulcrum. As shown in FIG. 4, the lower half collar portion 22 b comes into contact with the lower portion of the vertical wall 17. By bringing the collar portion 22 into contact with the vertical wall 17, the light guide member 12 is positioned in the longitudinal (front-rear) direction, and the head 23 is easily and reliably engaged with the locking claw 60 and the like with one touch.

  As shown in FIG. 4, the locking claw 60 is located at the approximate center of the opening 45 in the front-rear direction. The latching claw 60 bends inward while sliding the inclined surface of the outward claw portion 60b (FIG. 2) to the lower end of the opening 45, so that the claw portion 60b enters the opening 45 and is elastically removed. The claw portion 60b is engaged with the left and right upper edges 44a of the opening 45 by restoring the orientation. Since the projecting plate 61 enters and engages between the pair of ribs 48, the positional displacement of the head portion 23 in the left-right direction is prevented, and the engagement of the pair of left and right engaging claws 60 with the opening 45 is smoothly performed without positional displacement. Done. Further, since the upper portion of the front wall 58 of the frame wall 58 is engaged with the concave groove 49 of the head portion 23, the head portion 23 is prevented from being displaced in the front-rear direction (positioning is performed), and the upper end of the frame wall 58 is Supports the left and right collar walls 42, whereby the head 23 and the light guide member body 21 are positioned in the vertical direction.

  The frame wall 58 generally supports the left and right collar walls 42 at the upper ends of the front, rear, left and right wall portions 55 to 57 (the upper ends of the left and right and rear wall portions 55 and 56 support the lower surfaces of the left and right collar walls 42. Is preferred. For this purpose, it is preferable that the upper portion of the front wall 57 is extended (protruded) upward from the left and right and rear wall portions 55 and 56 and engaged with the groove 49. It is also possible to form a concave groove 49 in the lower part of the left and right flange walls 42 so that the upper parts of the front and rear wall parts 55 to 57 of the frame wall 58 are engaged in the concave groove 42. The frame wall 58 functions as a support means or a receiving portion for the light guide member 12.

  The lower half side of the light guide member main body 21 enters between the pair of left and right rear walls 55 of the frame wall 58. The light guide member main body 21 is guided and accommodated between a pair of left and right guide walls 53, and the rear end portion 13 of the light guide member main body 21 and the flange are placed in a wide space (inside the guide wall 52) on the proximal end side of the guide wall 53. The unit 22 is guided. The light guide member main body 21 is positioned substantially in parallel on the top wall 11 of the turnback 3, and the inclined front end portion 15 having the reflection surface 15 a of the light guide member main body 21 has a stepped opening in the top wall 11 of the turnover 3. It is located in close proximity to 16a.

  The front end portion 15 of the light guide member main body 21 is accommodated in the frame wall 58, and the upper opening of the frame wall 58 is sealed with the left and right collar walls 42 to prevent light leakage to the outside. Further, the step surface 22c at the lower end of the front half of the rear flange portion 22 is supported by the lower end edge 17a (FIG. 4) of the hole 19 of the turn-back 3 so that the rear end portion 13 of the light guide member main body 21 is in the vertical direction. The rear end surface 13a of the light guide member main body 21 is positioned in close proximity to the front surface of the light source 14 of the vertical circuit board 6.

  In FIG. 5, reference numeral 60 is a locking claw, 61 is a protruding plate for positioning, 44 is a horizontal plate wall, 45 is an opening thereof, 48 is a rib, 46 is a vertical plate portion, 21 is a light guide member body, and 3 is a look back. , 11 is an upper wall thereof, 54 is an inclined wall portion, 58 is a frame wall, and 53 is a guide wall. The left and right side surfaces of the light guide member main body 21 are located close to the inner surfaces of the left and right guide walls 53. 2 is positioned close to the inner surface of the guide wall 52 in the wide space.

  According to the above embodiment, the rear end portion 13 of the light guide member 12 is looked back 3 and inserted into the holes 19 and 20 of the case 2 so that the flange portion 22 contacts the wall portion 17 of the look back 3. 12 is inserted between a pair of ribs 48 provided on the head portion 23 on the distal end side of the twelve head, and the locking claw 60 is inserted into the head in a state where the center position in the left-right direction of the light guide member 12 is defined. By engaging with the opening 45 of the portion 23, the light guide member 12 is easily and securely coupled and fixed to the turn-back 3. In order to perform this fixing stably, a part 57 of the frame wall 58 of the turn 3 is fitted in the downward groove 49 of the head 23 to support the head 23. In addition, a pair of left and right guide walls (guide ribs) 52 and 53 are provided in order to enhance the assembling property of the light guide member 12 to the turn-back 3.

  With these configurations, after assembling the dial 6 (FIG. 1), the pointer 8, the case 2, the lookback 3, the covers 4, 10 and the like (afterwards), the light guide member 12 for illumination is assembled. And fixing work can be performed with good workability with a small number of work steps in one process.

  On the light irradiation surface 15b (FIG. 3) of the light guide member 12, that is, the lower inclined surface 15b opposite to the reflection surface 15a, light unevenness (difference in light amount) due to directivity when the LED 14 is used as a light source. In order to diffuse (prevent) the surface, it is preferable to form a texture (not shown). A wrinkle is a leather pattern, a grain pattern, a satin pattern, or the like.

  In the above-described embodiment, the light guide member 12 is mounted on the outside of the upper wall 11 of the facing 3. However, for example, when the light guide member 12 is mounted on the outside of the left and right side walls of the facing 3, or the above-mentioned patent document In the case where the light guide member 12 is mounted on the lower side of the light guide member 12 as in the illumination structure described in (3), the positioning means 48 and 61, the locking means 45 and 60, the support means 49 and 58, etc. are applied. can do.

  In the above-described embodiment, the rear end portion 13 of the light guide member main body 21 of the light guide member 12 is curved downward to be close to the light source 14 on the inner side of the circuit board 6. In the case of being located on the outer side, the rear end portion 13 of the light guide member main body 21 can be formed straight. Moreover, although the holes 19 and 20 for inserting the light guide member are provided in both the look 3 and the case 2, the hole 20 of the case 2 can be replaced with a large opening or a notch.

  Further, as the positioning means, the locking means, and the supporting means in the above embodiment, the protruding plate 61 is replaced with a protrusion, or the pair of ribs 48 are replaced with a pair of block portions or a pair of wall portions or hole portions (a gap between the pair of ribs). The retaining claw 60 is replaced with a locking arm, the left and right (transverse) groove 49 is replaced with a slit or hole, and the frame wall 58 is separated into front, rear, left and right It is also possible to replace with a wall portion or the like.

  The illumination structure of a meter according to the present invention can be used for easily mounting a substantially rod-shaped light guide member for illuminating a dial of an automobile meter, for example, on the outer wall portion of the turning back with good workability.

DESCRIPTION OF SYMBOLS 1 Instrument 2 Case 3 Look-back 5 Dial 12 Light guide member 13 Rear end part 14 Light source 15 Front end part 16 Opening 19 Hole part 21 Light guide member main body 22 Gutter part 23 Head part 45 Opening (locked part)
49 concave groove 48 rib (positioned part)
52, 53 Guide wall 58 Frame wall (support)
57 Front wall (wall)
60 Locking claw (locking part)
61 Veneer (positioning part)

Claims (3)

A light guide member is arranged on the outer surface side of the counter-view of the instrument, a rear end portion of the light guide member is inserted into the case from the counter-view hole, and light from the light source in the case is transmitted to the front end of the light guide member In the illumination structure of the instrument that leads to the part side and illuminates the dial from the facing opening,
The light guide member is a rod-shaped light guide member main body that is long in the front-rear direction, a flange that is provided on the rear end side of the light guide member main body and that contacts the peripheral edge of the hole, and the light guide member main body A head portion provided on the front end portion side, and the turn-back is engaged with a locked portion of the head, a positioning portion engaged with the positioned portion of the head, and A support part for supporting the head ,
With the rear end of the light guide member main body inserted into the hole and the flange contacting the peripheral edge of the hole, the front end of the light guide member main body is the opening with the flange as a fulcrum. By rotating toward the position, the locked portion is engaged with the locking portion, the positioned portion is engaged with the positioning portion, and the head is supported by the support portion. Characteristic lighting structure of the instrument.   The locked portion is an opening, the locking portion is a pair of left and right locking claws, the positioned portion is a pair of left and right ribs, and the positioning portion is a protruding plate that enters between the ribs; The lighting structure for an instrument according to claim 1, wherein the support portion includes a wall portion that engages with a concave groove in a horizontal direction of the head.   The pair of left and right guide walls for guiding and accommodating the light guide member main body and the flange portion are provided in the range from the hole portion to the support portion. Instrument lighting structure.

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