JP3136586B2 - Mounting structure of indicating instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicating instrument, such as a fuel gauge, a thermometer,
The present invention relates to a mounting structure of an indicating instrument for assembling and fixing an instrument main body used for an engine tachometer, a speedometer, a voltmeter, etc. in an instrument case.

[0002]

2. Description of the Related Art As a mounting structure of a conventional indicating instrument, as shown in, for example, Japanese Patent Application Laid-Open No. Hei 7-266931, a dial is attached and fixed to the front side of a movable magnet type instrument serving as an instrument main body. At the same time, a pointer is attached to the upper end of the pointer shaft of the movable magnet type instrument, and a circuit board for driving the movable magnet type instrument is attached and fixed to the bottom side of the movable magnet type instrument, and the dial and the circuit board are attached. A magnet type instrument is housed in an instrument case and fixed with screws or the like.

In this case, for example, as a night illumination of an indicating instrument, a light guide plate is disposed between the dial and the movable magnet type instrument, and a light source is installed corresponding to a light receiving portion of the light guide plate. The light emitted from the light source illuminates the scales, numerals, and symbols provided on the dial through the light guide plate, or illuminates the hands by guiding light rays into the base of the hands.

In the case where the circuit board provided inside the instrument case is electrically routed from the circuit board to the outside of the instrument case, as an example, a pin terminal connector is provided on the circuit board. A female connector is inserted into the pin terminal connector from the outside of the instrument case through an opening of the instrument case, fixedly connected thereto, and is drawn out from the connector by an electric cord.

[0005]

In the meantime, as an assembling and mounting structure of the above-mentioned indicating instrument, an electric component and a wiring pattern are provided on the circuit board, and the wiring pattern of the circuit board is short. It is necessary to install a predetermined gap between the instrument case and the circuit board in order to prevent a phenomenon such as a short circuit or a short circuit in the circuit. In addition, since it is mounted and fixed via a spacer or an erect rib from an instrument case, there is a problem that the number of parts is increased and the assembling work efficiency is likely to be lowered.

For night illumination of the indicating instrument, a light guide plate is disposed between the dial and the movable magnet type instrument and fixedly supported, or a light source is individually provided corresponding to a light receiving portion of the light guide plate. It has to be installed and mounted, and there is a drawback in terms of workability in assembling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it has been found that the efficiency of assembling the indicating instrument can be reduced without adding almost any number of components to the components of the normally used indicating instrument. It is an object of the present invention to provide a mounting structure of an instrument which can be increased.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an instrument main body having a built-in instrument movable part, and an instrument main body provided behind the instrument main body for driving the instrument movable part of the instrument main body. A circuit board, a pointer attached to the pointer shaft of the instrument main body, a dial for reading the indication of the pointer, and a light guide disposed on the back side of the dial for guiding light to the pointer and the dial. An optical body, a light source provided behind the light guide, fixed to the circuit board, and an instrument case for accommodating the instrument body, the circuit board, the light guide, and the like. A frame body provided integrally with the light guide and integrally holding the instrument body;
A mounting leg portion provided integrally with the light guide and for assembling the circuit board, and provided integrally with the light guide and extending further behind the circuit board to be fixedly held by the instrument case. And a fixing leg portion. Further, a pointer shaft insertion hole for inserting the pointer shaft of the instrument main body is provided in the light guide, and a flat surface portion of the light guide extends in a depth direction along a region connecting the pointer shaft insertion hole and the light source. A step portion is partially provided, and the step portion forms a light guide portion for illumination of the pointer, and reflects and guides a light beam to the pointer around the pointer shaft insertion hole of the light guide portion. A light-receiving part is formed at the other end of the light-guiding part so as to face the light source.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An instrument mechanism such as an instrument body or a circuit board housed in an instrument case has a dial attached to the front side with respect to a light guide, and an instrument body, Since the unit can be sequentially assembled with the circuit board and configured as one unit, the unitized indicator can be easily set in the instrument case, and the efficiency of assembling the indicator can be increased. In addition, a step portion is provided partially from the flat surface portion of the light guide toward the depth direction, and the step portion forms a light guide portion for illumination of the pointer, and the periphery of the pointer shaft insertion hole of the light guide portion. By forming a reflective surface for reflecting and guiding light rays to the pointer at the part, and forming a light receiving part opposite to the light source at the other end of the light guide part, it is separate from the illumination light path of the dial and dedicated Since the illumination light path for the illumination of the pointer can be formed, the illumination effect can be enhanced.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 6 show a first embodiment of the present invention. In this embodiment, a cross-coil movable magnet type instrument is applied as an instrument body H, and a bobbin made of a synthetic resin divided vertically. A movable magnet 3 is built in the pointer 1 via a pointer shaft 2, the upper end of the pointer shaft 2 protrudes from above the bobbin 1, a pointer 4 is mounted on the tip, and a coil 5 is mounted on the peripheral surface of the bobbin 1. Are wound crosswise to electrically connect the coil 5 to the upper end of the female terminal 6 attached to the leg of the bobbin 1.

The bobbin 1 incorporates the movable magnet 3, is a bearing member at least on the lower side of the pointer shaft 2, and is a frame for winding the coil 5.
In addition, it is also a holding member for the terminal 6 which is formed by being electrically routed from the coil 5 to the outside. In this embodiment, a mounting arm 8 is formed integrally extending from the bobbin 1 to the side of the cylindrical case 7 so as to block disturbance factors. The instrument body H of the entire cross-coil movable magnet instrument is constituted.

On the front side of the instrument body H, the pointer 4
A dial 9 for contrasting and reading the instruction is provided, and the irradiation light is guided to the hands 4 and the dial 9 on the back side of the dial 9 and on the front side of the instrument main body H. A translucent light guide 10 made of a synthetic resin material is provided.

A circuit board 11 is provided on the lower surface side of the instrument main body H. A pin terminal connector 11A electrically connected to a conductive pattern provided on the circuit board 11 has a circuit. The pin terminal connector 11A is provided on the surface of the board 11, and the female terminal 6 provided on the instrument main body H is electrically connected to the pin terminal connector 11A. Electric component 12 for driving
The light source 13 for illuminating the hands 4 and the dial 9 is mounted on the circuit board 11.
Connected to the upper conductive pattern, and
The pin-type electrical connector 14 serving as an external lead-out portion that is formed by being electrically routed to the outside at an appropriate position is provided on the circuit board 11.
In this embodiment, a light emitting diode in the form of a chip is used as the light source 13 in this embodiment.

Further, in this embodiment, the light guide 10 is provided with a pointer shaft insertion hole 15 through which the pointer shaft 2 of the instrument main body H is inserted, and the pointer shaft insertion hole 15 and the light source 13 are connected to each other. A step portion is provided in the depth direction from the flat surface portion 16 of the light guide 10 on which the dial 9 is placed along the connecting region, and the light guide portion 17 for pointer illumination is provided by the step portion. In addition, a reflection surface 18 for reflecting and guiding illumination light toward the base 4A side of the pointer 4 is formed in the periphery of the pointer shaft insertion hole 15 of the light guide 17 and the other end of the light guide 17 A light receiving portion 19 is formed opposite to a position where the light source 13 is disposed in the portion, and the pointer shaft insertion hole 15 has a pointer shaft 2 and a base of the pointer 4 which is pressed into the pointer shaft 2. 4A is inserted and the pointer axis is inserted. Upper bearing 20 of the pointer shaft 2 by 径少 portion at the lower side of narrowed inner diameter of the pointer shaft insertion hole 15 of the hole 15 is formed.

The light guide 10 is provided with the light guide 1
A frame body 21 for assembling and holding the mounting arm 8 of the instrument main body H is integrally formed from the back side of the light guide 10, and the frame is integrally formed from the back side of the light guide 10.
A predetermined number of mounting legs 22 for mounting the circuit board 11 extending slightly behind the bottom position of the instrument body H mounted on the body 21 are formed.
On the back side, fixed legs 23 extending to the rear side of the circuit board 10 with respect to the protruding height of the mounting legs 22 of the circuit board 11 are integrally formed from the light guide 10,
The fixed leg portion 23 and an instrument case 24 described later are fixedly held.

In this embodiment, in order to enhance the workability of assembly, the circuit board 11 is attached to a part of the mounting legs 22 of the predetermined number of mounting legs 22 provided integrally from the light guide 10. Are formed integrally with the positioning portion 25,
Also, of a predetermined number of fixed legs 23 integrally provided from the light guide 10, a positioning portion 26 for positioning with the instrument case 24 is integrated with a part of the fixed legs 23. A positioning hole 27 is formed in the circuit board 11 and a positioning hole 28 is formed in the meter case 24 in accordance with the positional relationship in which the positioning portions 25 and 26 are formed.

An opening 29 is formed in the instrument case 24 at a position corresponding to the position of the pin-type electrical connector 14 provided on the circuit board 11, and the instrument case 24 is formed through the opening 29. The pin-type electrical connector 1 is connected to a female connector 30 connected to an electrical cord from outside.
And electrically connected to the pointer 4
Is constructed by using a light-emitting pointer having a reflecting surface of an appropriate shape known in, for example, Japanese Utility Model Publication No. 58-13693 and Japanese Utility Model Application Publication No. Sho 56-175795. Examples of the structure of the expression type dial 9 include Japanese Utility Model Publication No. Sho 53-31815 and Japanese Utility Model Publication No. Sho 5-5.
A dial plate structure for transmitting and illuminating a display unit such as a scale, a number, or a symbol, which is known from Japanese Patent Publication No. 8-13299 or Japanese Utility Model Publication No. 4-16179, is used.

In the mounting structure of the indicating instrument having the above construction, the dial 9 is fixed on the front side of the light guide 10 with a double-sided adhesive tape or a fixing screw. On the rear side of the instrument 10, the mounting arm 8 of the instrument main body H composed of a movable magnet instrument is attached to a frame body 21 integrally formed with the light guide 10, and the instrument is attached by means of heat welding, bonding or fixing screws. The main body H is mounted and fixed on the light guide 10 side, and then the circuit board 11 is fixed to the mounting leg 22 formed integrally with the light guide 10 by a fixing screw S.
At this time, the circuit board 11 can be easily assembled and set on the back side of the light guide plate 10 while the positioning portion 25 provided on the mounting leg 22 is guided by the positioning hole 27 of the circuit board 11. At the time of this assembling setting, the electrical connection between the female terminal 6 of the instrument main body H and the pin terminal 11A on the circuit board 11 can be simultaneously performed.

The pointer 4 is fixed at a predetermined position by fixing the instrument body H to the light guide 10 and then press-fitting the tip of the pointer shaft 2 of the instrument body H.

Therefore, as described above, the instrument mechanism such as the instrument main body H and the circuit board 11 has the dial 9 mounted on the front side with respect to the light guide 10 and the instrument body H and the circuit board 11 on the rear side. 11 and can be assembled as a single unit, so that the unitized indicator can be easily set in the instrument case 24. In this case, the fixed legs provided integrally from the light guide 10 The unit 23 and the instrument case 24 can be fixedly held by turning and fixing the unit 23 and the instrument case 24 with fixing screws S. In this embodiment, the fixed leg unit 23 is used. The positioning part 26 provided in the instrument case 24
The indicator in the unit state can be easily assembled and set in the instrument case 24 while being guided by the positioning holes 28, whereby the fixing operation by the fixing screws S can be easily performed. Can improve the assembling work efficiency.

When the unitized indicating instrument is assembled in the instrument case 24, the fixed leg portion 23 connects the fixed leg 2 between the inner surface of the instrument case 24 and the circuit board 11.
By appropriately setting the height of 3, the electric component 12 mounted on the circuit board 11 and the instrument case 24 can be formed without contact, and a short phenomenon due to the contact, a short circuit of the circuit, etc. Can be prevented.

Further, the light guide 10 is provided with a stepped portion from the flat surface portion 16 of the light guide 10 on which the dial 9 is placed toward the depth direction. In addition to forming the light portion 17, a reflection surface 18 for reflecting and guiding light rays to the hands 4 is formed in the periphery of the pointer shaft insertion hole 15 of the light guide portion 17, and at the other end of the light guide portion 17. By forming the light receiving portion 19 in opposition to the light source 13, an illumination light path for dedicated pointer illumination can be formed separately from the illumination light path of the dial 9, so that the illumination effect can be enhanced. .

That is, a part of the irradiation light beam emitted radially from the light emitting diode which is the light source 13 is guided to the flat surface portion 16 of the light guide 10 and directly or directly to the light guide 1.
The display portion of the dial 9 is indirectly transmitted and illuminated while reflecting and guiding the inside of the flat surface portion 16 of the light source 0, and other irradiation light rays are guided from the light receiving portion 19 into the light guiding portion 17, and Optical part 1
The light beam guided by 7 is mainly guided to the base 4A of the pointer 4 via the reflection surface 18 and the indicator emits light via the reflection surface of the pointer 4, and in this case, the light guide Part 1
A part of the light beam guided to 7 is diffracted to the flat surface portion 16 and the illumination of the display portion of the dial 9 is promoted.

Further, the light guide 10 is provided with a pointer shaft insertion hole 15 through which the pointer shaft 2 of the instrument main body H is inserted, and a reflection portion for reflecting and guiding light rays to the pointer 4 around the pointer shaft insertion hole 15. A surface 18 is formed, and the pointer shaft 2 and a part of the base 4A of the pointer 4 to be press-fitted into the pointer shaft 2 are inserted into the pointer shaft insertion hole 15 at the lower end of the pointer shaft insertion hole 15. Since the upper bearing 20 of the pointer shaft 2 is formed by a small-diameter portion where the inner diameter of the pointer shaft insertion hole 15 is reduced, when the instrument main body H is assembled and fixed to the light guide 10, the instrument main body H
Of the pointer shaft 2 can be aligned with the center position of the pointer shaft insertion hole 15, thereby suppressing a positional deviation between the set position of the reflection surface 18 of the light guide 10 and the positional relationship between the base 4A of the pointer 4. The light rays reflected and guided from the reflection surface 18 can be efficiently guided into the pointer 4.

FIG. 7 shows a second embodiment of the present invention. In this embodiment, the female terminal 6 of the instrument main body H of the first embodiment and the pin terminal 11A on the circuit board 11 are connected. Instead of the connection structure, a female terminal 11B is mounted and fixed on the circuit board 11, and the female terminal 11B and the pin terminal 6A provided on the instrument main body H side are detachably provided.

Therefore, in the second embodiment, when the indicating instrument is assembled, the dial 9 is assembled on the front side with respect to the light guide 10 and on the rear side, as in the first embodiment. An instrument body H composed of a movable magnet instrument is assembled and fixed, and then the circuit board 11 is fixed to a mounting leg 22 formed integrally with the light guide 10 by a fixing screw S.
At this time, the circuit board 11 is easily assembled on the back side of the light guide plate 10 while the positioning portion 25 provided on the mounting leg portion 22 and the positioning hole 27 of the circuit board 11 are respectively guided. At this time, the pin terminals 6A of the instrument body H and the circuit board 1 can be set.
The electrical connection with the upper female terminal 11B can also be made at the same time, which has the effect of increasing the efficiency of assembling the indicating instrument.

In the above-described embodiment, the light emitting diode is used as the light source. However, the light emitting diode can be changed as appropriate, such as an incandescent light bulb or a small fluorescent lamp. The shape and the shape of the light receiving section, the length and the number of the mounting leg and the fixed leg, and the like may be appropriately set.

[0028]

According to the present invention, an instrument main body having a built-in instrument movable section, a circuit board provided behind the instrument main body for driving the instrument movable section of the instrument main body, A pointer attached to the pointer shaft, a dial for reading the instruction of the pointer, and a light guide disposed on the back side of the dial and illuminating the pointer and the dial with light,
A light source disposed behind the light guide and fixed to the circuit board; and an instrument case for accommodating the instrument body, the circuit board, the light guide, and the like. Is a frame body provided integrally with the light guide and mounting and holding the instrument body; a mounting leg integrally provided with the light guide and mounting the circuit board; And a fixing leg portion extending further behind the circuit board and fixedly held by the instrument case. -The instrument body such as the instrument body and the circuit board housed in the switch is assembled with a dial on the front side based on the light guide, and the instrument body and the circuit board on the back side in that order. Because it can be configured as a unit, Scan the unitized indicating instrument can be easily set in, it is possible to enhance the working efficiency of assembling the indicating instrument. In addition, a step portion is provided partially from the flat surface portion of the light guide toward the depth direction, and the step portion forms a light guide portion for illumination of the pointer, and the periphery of the pointer shaft insertion hole of the light guide portion. By forming a reflective surface for reflecting and guiding light rays to the pointer at the part, and forming a light receiving part opposite to the light source at the other end of the light guide part, it is separate from the illumination light path of the dial and dedicated Since the illumination light path for the illumination of the pointer can be formed, the illumination effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an indicating instrument showing an entire structure of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing an instrument main body mounted on the light guide of the embodiment and a circuit board before mounting.

FIG. 3 is a cross-sectional view showing a main part in which an instrument mechanism is assembled in the instrument case of the embodiment.

FIG. 4 is a sectional view of an assembled state showing an illumination light path of the light guide of the embodiment and a case fixing portion.

FIG. 5 is a sectional view of an assembled state of a main part mainly showing the assembly of the circuit board of the embodiment.

FIG. 6 is a sectional view of an assembled state mainly showing a positioning state of the instrument case and the light guide side of the embodiment.

FIG. 7 shows the second embodiment of the present invention, and is a cross-sectional view of a main part showing a meter main body assembled to a light guide and a circuit board before assembly.

[Explanation of symbols]

 H Instrument body 1 Bobbin 2 Pointer shaft 3 Moving magnet 4 Pointer 5 Coil 6 Female terminal 6A Pin terminal 7 Cylindrical case 8 Mounting arm 9 Dial plate 10 Light guide 11 Circuit board 11A Pin terminal connector 11B Female terminal DESCRIPTION OF SYMBOLS 12 Electric component 13 Light source 14 Pin type electric connector 15 Pointer shaft insertion hole 16 Flat surface part 17 Light guide part 18 Reflection surface 19 Light receiving part 20 Upper bearing 21 Frame body 22 Mounting leg part 23 Fixed leg part 24 Instrument cage S 25 Positioning part 26 Positioning part 27 Positioning hole 28 Positioning hole 29 Opening 30 Female connector

Claims (9)

(57) [Claims] An instrument main body having a built-in instrument movable section, a circuit board provided behind the instrument main body for driving the instrument movable section of the instrument main body, and a pointer attached to a pointer shaft of the instrument main body. A dial for reading instructions of the hands, a light guide disposed on the back side of the dial, for guiding and illuminating the hands and the dial, and a light guide disposed behind the light guide. A light source attached to and fixed to the circuit board; and an instrument case for accommodating the instrument body, the circuit board, the light guide, and the like. The light guide is provided integrally with the light guide. A frame body for mounting and holding the instrument body, a mounting leg for integrally mounting the circuit board, and a mounting leg for integrally mounting the circuit board, and further integrally provided from the light guide, further behind the circuit board. Side to extend to the side
And a fixed leg fixed to and held by the terminal. 2. The mounting of the indicating instrument according to claim 1, wherein the instrument main body is provided with a mounting arm for assembling to the frame body, extending from a side of the instrument main body. Construction. 3. A mounting structure for an indicating instrument according to claim 1, wherein a predetermined number of said mounting legs are provided, and a positioning portion is formed in a part of said mounting legs. 4. The mounting structure for an indicating instrument according to claim 1, wherein a predetermined number of the fixed legs are provided, and a positioning portion is formed in a part of the fixed legs. 5. A pointer shaft insertion hole through which the pointer shaft of the instrument main body is inserted in the light guide, and a flat surface portion of the light guide along a region connecting the pointer shaft insertion hole and the light source. A step portion is provided partially in the depth direction, and the step portion forms a light guide portion for illumination of the pointer, and a light beam is transmitted to the pointer around the pointer shaft insertion hole of the light guide portion. The mounting structure for an indicating instrument according to any one of claims 1 to 4, wherein a reflecting surface for reflecting and guiding light is formed, and a light receiving portion is formed at the other end of the light guiding portion so as to face the light source. . 6. The mounting structure for an indicating instrument according to claim 1, wherein the inner diameter of the pointer shaft insertion hole of the light guide is narrowed to form an upper bearing of the pointer shaft. 7. The mounting structure for an indicating instrument according to claim 1, wherein said instrument main body is constituted by a movable magnet type instrument. 8. The mounting structure for an indicating instrument according to claim 1, wherein terminals are provided on the instrument main body and the circuit board, respectively, and the terminals are detachably provided. 9. The mounting structure for an indicating instrument according to claim 1, wherein a light emitting diode is used as said light source.