JP3147218B2 - Electrical connection structure of instrument movement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection structure of an instrument movement, and more particularly to an electric signal for driving a pointer attached to a pointer shaft to a rotational position corresponding to a measured amount such as a vehicle speed, for example, in a vehicle combination meter. The present invention relates to an electrical connection structure of an instrument movement for making an electrical connection to supply the instrument movement to an instrument movement such as a cross-coil type movement.

[0002]

2. Description of the Related Art Conventionally, there has been an electric connection structure of this kind as shown in FIG. In the figure, a cross-coil movement 1 as an instrument movement rotates a magnet rotor having NS poles magnetized radially in the space of a hollow coil bobbin around which a pair of coils are wound so as to cross each other on the outer periphery. Arrange freely, and apply a current of varying magnitude to the pair of coils according to the measured amount. At this time, rotate the magnet rotor so that the NS poles match the combined magnetic field direction that combines the magnetic fields generated by each coil. The rotary shaft of the magnet rotor is used as a pointer shaft 1a, and the pointer 1b attached thereto is driven to a rotational position corresponding to the measured amount.

[0003] The coil wound around the coil bobbin is entirely housed in a magnetic shielding case 11 for blocking internal and external magnetic interference. A support portion 12 is formed integrally with the coil bobbin so as to protrude out of the magnetic shielding case 11, and each coil end is wound around an upper end portion 13a of a relay terminal 13 held by the support portion 12. It is soldered and electrically connected. Upper end 1 of relay terminal 13 to which coil end is electrically connected
3a is bent but straight when each coil end is wound.

[0004] The entire cross-coil movement 1 has a fixing screw 15 inserted from the front side of the light guide plate 14b on the back side constituting the dial member 14 together with the dial plate 14a on the front side, and screwed into the support portion 12. As a result, it is fixed to the back surface of the dial member 14. When a current varying in size according to the measured amount is applied to each coil on the dial member 14 to which the cross-coil movement 1 is fixed, the pointer shaft 1a is driven to a rotational position according to the measured amount. A hole 14c is formed so that the tip of the hole 14c can pass through to the surface of the dial 14a. The pointer 1b is press-fitted and fixed to the pointer shaft 12, and indicates the measurement amount in cooperation with the scale of the dial 14a.

The dial plate member 14 has a positioning hole 14d formed in the periphery of the light guide plate 14b and a positioning pin 2 projecting from the periphery of the combination meter case 2 made of synthetic resin.
After a is fitted, it is positioned and fixed to the combination meter case 2 by fixing with a fixing screw (not shown).

A base 13b is formed at the lower end of the relay terminal 13 by bending it into an L-shape, and a screw hole 13c of the base 13b penetrates the bottom of the combination meter case 2 from the case back side. A headed screw 15 inserted through 2b is screwed. The back of the combination meter case 2 has a cross-coil movement 1
A printed wiring circuit board 16 composed of a flexible printed wiring circuit board having electric wiring for supplying a current of which magnitude changes according to the measured amount to each coil is provided. The electric wiring of the printed wiring circuit board 16 is printed on an insulating sheet, and is covered with a resist layer except for parts to be electrically connected. This printed wiring circuit board 16
Is sandwiched between the back surface of the combination meter case 2 and the head 15a of the headed screw 15 by an electric wiring portion, and at this time, the electric wiring and the head 15a are brought into electrical contact. Thereby, power is supplied to each coil of the cross-coil movement 1 via the electric wiring of the printed wiring circuit board 16, the headed screw 15, and the relay terminal 13.

Although not shown, a light source that is turned on by being supplied with electric power through the electric wiring of the printed circuit board 16 is provided at the bottom of the combination meter case 2.
Light from the light source is introduced from a light introducing portion provided at an edge of the light guide plate 14b, is guided through the light guide plate 14b, and irradiates the back of the dial 14a.
The dial 14a is illuminated by passing through the dial and the scale printed with the character and printed on the dial surface surface side so that the dial and the like can be visually recognized even when the surroundings are dark such as at night.

[0008]

In the above-described conventional structure, the relay terminals 13 of the cross-coil movement 1 existing inside and outside the combination meter case 2 and the electric wiring of the printed wiring circuit board 16 are electrically connected. A headed screw 15 is inserted into the case hole 2 b of the combination meter case 2 and the headed screw 15 is screwed into the screw hole 1 of the relay terminal 13.
3c, the bottom of the combination meter case 2 is sandwiched between the headed screw 15 and the relay terminal 13 in this structure.
5 is reduced by the stress relaxation of the synthetic resin forming the case, and the contact of the headed screw 15 with the electric wiring of the printed wiring circuit board 16 becomes unstable. There is a problem that the reliability of the electrical connection between the electrical wiring of the printed wiring circuit board 16 and the relay terminal 13 is impaired.

In addition, a screw hole 13c into which a headed screw 15 inserted into the case hole 2b of the combination meter case 2 is screwed to electrically connect the electric wiring of the printed wiring circuit board 16 and the relay terminal 13 is relayed. Base 1 of terminal 13
3b, the cost is increased.

In the conventional structure described above, the cross-coil movement 1 is fixed to the combination meter case 2 via the dial member 14 positioned and fixed to the combination meter case 2, so that the printed wiring circuit board is provided. Since the electrical wiring 16 and the relay terminal 13 are electrically connected, the positions of the headed screw 15 inserted into the case hole 2b of the combination meter case 2 and the screw hole 13c of the relay terminal 13 do not match. Despite such displacement, if the headed screw 15 is forcibly screwed into the screw hole 13c, stress due to the displacement is accumulated in the relay terminal 13 and the headed screw 15 is also inclined, so that the stress is reduced. Since there is no escape place, the electrical contact between the electric wiring of the printed wiring circuit board 16 and the headed screw 15 becomes unstable, and the electric wiring of the printed wiring circuit board 16 via the headed screw 15 and the relay terminal 13 There has been a problem that the reliability of the electrical connection is impaired.

Further, the relay terminal 13 has only a base 13b formed by bending the lower end thereof into an L-shape, and is straight from the upper end 13a to the base 13b, which is bent after the coil end is electrically connected. Since there is no allowance, the stress due to dimensional change due to thermal expansion and contraction of the combination meter case 2 and the like is applied to the relay terminal even if the stress due to positional deviation is not accumulated in the relay terminal 13. In addition, this causes the base 1 of the relay terminal 13
3b, the screwing of the headed screw 15 into the screw hole 13c is loosened, and the contact of the headed screw 15 with the electric wiring of the printed wiring circuit board 16 becomes unstable, and the printed wiring circuit via the headed screw 15 There is a problem that the reliability of the electrical connection between the electrical wiring of the substrate 16 and the relay terminal 13 is impaired.

Accordingly, in view of the above-mentioned conventional problems, the present invention provides a printing apparatus in which a relay terminal of an instrument movement fixed to a meter case via a dial member positioned and fixed to the meter case and a rear surface of the meter case are arranged. An object of the present invention is to provide an electrical connection structure of an instrument movement that can perform electrical connection with electrical wiring of a printed circuit board at low cost without impairing its reliability.

In view of the above-mentioned conventional problems, the present invention also provides a relay terminal of an instrument movement fixed to a meter case via a dial member positioned and fixed to the meter case, and printing disposed on a back surface of the meter case. The reliability of the electrical connection between the electrical wiring on the printed circuit board and the relay terminals is maintained even if there is a displacement between the electrical wiring on the printed circuit board and dimensional fluctuation due to thermal expansion or contraction of the meter case. An object of the present invention is to provide an electrical connection structure for an instrument movement that is not damaged.

[0014]

According to a first aspect of the present invention, there is provided an electrical connection structure for an instrument movement, which is provided with a dial member positioned and fixed to a synthetic resin meter case. The instrument movement is fixed to the meter case, and a relay terminal of the instrument movement is electrically connected to an electric wiring of a printed wiring circuit board arranged on the back of the meter case, and the instrument movement is passed through the electric wiring and the relay terminal. In the electrical connection structure of the instrument movement, which is configured to supply power for driving the pointer attached to the pointer shaft to a rotation position according to the measured amount, the meter case and the printed wiring board are provided with terminal tip insertion holes, respectively. The tip of the relay terminal inserted through the terminal tip insertion hole is printed on the back surface of the printed circuit board. It is characterized in that by electrical wiring and electrical connections of the line circuit board.

In this structure, the relay terminal of the instrument movement is inserted through a terminal tip insertion hole provided in the meter case and the printed wiring board, and the leading end of the printed wiring board which is pulled out on the back side is printed on the back side of the printed wiring board. It is designed to be electrically connected to the electric wiring of the printed circuit board.

Therefore, the electrical wiring of the printed wiring circuit board and the relay terminal, which are both present outside the meter case, are electrically connected on the back surface of the printed wiring board, so that the electrical connection for clamping the synthetic resin meter case is sandwiched therebetween. This eliminates the need for a structure, and eliminates the need to provide a screw hole in the relay terminal.

According to a second aspect of the present invention, there is provided an electrical connection structure for an instrument movement, wherein a distal end portion of a relay terminal is formed in a flat plate shape allowing deformation.

In this structure, since the instrument movement is fixed to the meter case via the dial member that is positioned and fixed to the meter case, even if there is some deviation in the fixed position of the instrument movement, the relay terminal can be moved. The displacement is absorbed by the deformation of the plate-shaped part, and through the terminal end insertion hole of the meter case and the printed wiring circuit board,
The printed wiring circuit board can be inserted so as to pass through the back side.

According to a third aspect of the present invention, there is provided an electrical connection structure for an instrument movement, which guides the insertion of the tip of the relay terminal into the terminal tip insertion hole of the meter case. The guide portion is provided.

In this structure, since the insertion of the relay terminal into the terminal tip insertion hole of the meter case is performed by being guided by the guide, smooth insertion is possible even if there is a slight displacement.

According to a fourth aspect of the present invention, there is provided an electric connection structure for an instrument movement, wherein the relay is electrically connected to an electric wiring of the printed circuit board on a back surface of the printed circuit board. Screws formed at the tip of the relay terminal and the printed wiring of the printed wiring board by bending the tip of the terminal along the back surface of the printed wiring board and making electrical contact with the electrical wiring of the printed wiring board. The tip end of the relay terminal and the printed wiring of the printed wiring board are sandwiched between the headed screw inserted into the insertion hole and screwed into the meter case and the back surface of the meter case so as to maintain the electrical contact. It is characterized by having.

In this structure, the relay terminal of the instrument movement is inserted through a terminal tip insertion hole provided in the meter case and the printed wiring board, and the tip part which has come out to the back side of the printed wiring board extends along the back side of the printed wiring board. Bends and makes electrical contact with the electrical wiring of the printed circuit board. Headed screws are inserted into the screw insertion holes formed in the tip of the relay terminal and the printed wiring of the printed circuit board, and screwed into the meter case. The tip of the relay terminal and the printed wiring of the printed wiring board are sandwiched between the head and the back of the meter case, so that electrical contact therebetween is maintained.

Accordingly, the headed screw is screwed into the synthetic resin meter case so as to keep the electric wiring of the printed wiring circuit board and the relay terminal in direct contact with each other. Is held forever and does not lower, and the headed screw can be screwed together by using a self-tapping screw.

According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, an electric connection structure for an instrument movement is provided in which a relay terminal is bent along a back surface of a printed wiring board. In addition, a weakened portion for facilitating the above process is formed, and a screw insertion hole formed at a tip end portion of the relay terminal is formed as an elongated hole.

With this structure, even when the tip of the middle liquid terminal that has passed through the terminal tip insertion hole is slightly misaligned when it is bent, it can be bent at an arbitrary position in the weakened portion, and the relay can be performed. Since the screw insertion hole at the tip of the terminal is a long hole, the headed screw inserted through this screw insertion hole can be screwed into the meter case through the screw insertion hole formed in the printed wiring of the printed wiring board. .

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are a side sectional view, an exploded perspective view and a partial plan view showing an embodiment of an electrical connection structure of an instrument movement according to the present invention. Equivalent parts are given the same reference numerals.

A cross-coil type movement 1 as an instrument movement has a magnet rotor (not shown) rotatably arranged in a space of a hollow coil bobbin around which a pair of coils 1c are wound so as to intersect with each other.
An electric current whose magnitude changes in accordance with the measured amount is passed through c to rotate the magnet rotor to a rotational position corresponding to the measured amount, and the rotating shaft of the magnet rotor is used as the pointer shaft 1a and the pointer 1b attached thereto is used as the measured amount It is configured to drive to a designated position according to the instruction.

A pair of support portions 12 are integrally formed with the coil bobbin housed in the magnetic shielding case 11 together with the coil 1 c so as to protrude outside the magnetic shielding case 11.
Each support portion 12 holds two relay terminals 13 and
The cross-coil movement 1 is screwed and supported on a dial member 14 composed of a dial 14a and a light guide plate 14b by a fixing screw 15 formed of a tapping screw. The support portion 12 holds a relay terminal 13. Terminal insertion hole 12a and a tapping screw hole 12b are formed.

The relay terminal 13 is formed by sheet metal forming a brass sheet having a thickness of, for example, about 0.3 mm.
The surface is tin-plated, and as shown in FIGS. 4 and 5, a narrow coil winding portion 13d is provided at the upper end, a bag-shaped insertion portion 13e is provided below the coil winding portion 13d, and a plate-like shape is further provided thereunder. It has a U-shaped electric connection portion 13f. The terminal insertion hole 12a of the support portion 12 is formed such that the coil winding portion 13d of the relay terminal 13 inserted along the longitudinal direction of the pointer shaft 1a completely comes out above the support portion 12, and the insertion portion 1
When the whole of 3e is accommodated in the terminal insertion hole 12a, it is formed in a shape such that a part of the bag-shaped insertion portion 13e hits and stops.

A projecting portion 13d1 is formed at the boundary between the coil winding portion 13d of the relay terminal 13 and the insertion portion 13e. , The relay terminal 13 is the terminal insertion hole 1
Temporarily fixed to the state held in 2a. The coil winding portion 13d is wound around the coil end, soldered and electrically connected, and then formed at the boundary between the protrusion 13d1 and the bag-like insertion portion 13e for weakening. Constriction 1
By bending the protrusion 13d1 at a right angle at 3d2, the bag-like insertion portion 13e is lifted by the principle of leverage with the protrusion 13d1 as a fulcrum so that the bag-like insertion portion 13e is securely held in the terminal insertion hole 12a without play. Become. In addition, the relay terminal 1
The third electrical connection portion 13f is formed by bending at the lower end of the bag-shaped insertion portion 13e at a right angle in the horizontal direction and then further at a right angle downward, and a reinforcing rib 13f is provided at the downward bending portion.
1, a long hole 13f2 is provided at the lower end, and a rectangular hole 13f3 is provided above the long hole 13f2 such as this oval hole.

The entire cross-coil movement 1 is supported by a fixing screw 15 inserted from the front side of the light guide plate 14b on the back side constituting the dial member 14 together with the front side of the dial plate 14a of the dial member 14. It is fixed to the back surface of the dial member 14 by being screwed into the tapping screw hole 12 b of the portion 12. The pointer shaft 12 of the fixed cross-coil movement 1 has holes 14c formed in the dial 14a and the light guide plate 14b of the dial member 14, respectively.
The pointer 1a is press-fitted and fixed to the front end portion of the dial 14a that has come out through the surface of the dial 14a through 1 and 14c2. When a current whose magnitude changes according to the measured amount is applied to each coil of the cross-coil movement 1, the pointer 1a together with the pointer shaft 12
Is driven to the rotational position according to the measured amount, and instructs the measured amount in cooperation with the scale of the dial 14a.

The dial member 14, to which the cross-coil movement 1 is fixed on the back side, is provided with a positioning hole 14d formed in a boss 14b1 provided on the periphery of the light guide plate 14b and a peripheral portion of the combination meter case 2 made of synthetic resin. The positioning pin 2a protruding from the bracket is fitted and fixed with a fixing screw or the like (not shown) to fix the positioning to the combination meter case 2. The positioning and fixing of the dial member 14 causes the cross to the combination meter case 2 to be fixed. The positioning of the coiled movement 1 is also performed.

The bottom of the combination meter case 2 and the printed wiring circuit board 16 composed of a flexible printed circuit board disposed on the back surface of the combination meter case 2 are positioned on the combination meter case 2 via the dial member 14. Terminal tip insertion holes 2c and 16a into which the electrical connection portions 13f of the respective relay terminals 13 of the cross coil type movement 1 are inserted, and the tip ends of which are pulled out to the back side of the printed circuit board 16.
Is open. At the bottom of the combination meter case 2, a guide portion 2d for guiding the electric connection portion 13f to be inserted into the terminal tip insertion hole 2c is formed integrally with the case protruding inside the case when the case is formed. The guide portion 2d is formed by four inclined surfaces 2e of a pyramid-shaped depression connected to the terminal tip insertion hole 2c.

The distal end of the electrical connection portion 13f that has escaped to the back side of the printed circuit board 16 is bent at a right angle along the back surface of the printed circuit board 16 at a portion weakened by the rectangular hole 13f3. I have. And the electrical connection 13
The screw insertion hole 1 is formed in a portion of the printed wiring circuit board 16 corresponding to the oblong hole 13f2 such as an oblong hole formed at the tip of the f.
6b, and a tapping screw hole 2 is provided in a portion of the combination meter case 2 corresponding to the screw insertion hole 16b.
f are formed respectively. At the portion of the printed circuit board 16 where the screw insertion hole 16b is opened, the connection land 16c where the mask layer at the end of the electric wiring 16c for supplying power to each relay terminal is removed to expose the copper foil portion of the electric wiring.
There is one. The combination meter case 2
The boss 2f protruding into the bottom of the hole is for forming a tapping screw hole 2f.

A headed screw 1 made of a self-tapping screw through an elongated hole 13f2 such as an oval hole at the tip of the electrical connection portion 13f and a screw insertion hole 16b of the printed circuit board 16.
7 is screwed into the tapping screw hole 2f of the combination meter case 2 and tightened, so that the printed wiring circuit board 16 and the front end of the electrical connection portion 13f are connected to the back surface of the combination meter case 2 and the head 17a of the headed screw 17.
Between the relay terminal 13 and the electrical wiring 16c of the printed wiring circuit board 16 while the distal end of the electrical connecting portion 13f is held in contact with the connection land 16c1 of the electrical wiring 16c of the printed wiring circuit board 16. Are electrically connected. As a result, power is supplied through the electric wiring 16c of the printed wiring circuit board 16 and the relay terminal 13 to flow a current of which magnitude changes according to the measured amount to each coil of the cross-coil movement 1.

The bottom of the combination meter case 2 and the printed circuit board 16 are provided with a mounting hole 2g for mounting a light source 18 which is supplied with power through an electric wiring (not shown) and which is lit when the surroundings are dark such as at night. 16d is open. Light from the light source 18 is introduced from a light introducing portion provided at an edge of the light guide plate 14b, is guided through the light guide plate 14b, and irradiates the back of the dial 14a. The dial 1 is transmitted through the printed scale, characters, etc., and escapes to the dial surface side.
4a is illuminated so that the scale and the like can be visually recognized even when the surroundings are dark such as at night.

In the structure described above, the printed circuit board 16 is disposed between the bottom of the combination meter case 2 and the head 17a of the headed screw 17 screwed into the tapping screw hole 2f.
Since the electrical wiring 16c of the printed wiring circuit board 16 and the electrical connecting portion 13f of the relay terminal 13 are held in direct contact with each other with the electrical wiring 16c and the electrical connecting portion 13f of the relay terminal 13 interposed therebetween. The tightening force of the headed screw 17 is maintained forever and does not decrease, and the contact of the electrical connection portion 13f of the relay terminal 13 with the electrical wiring 16c of the printed wiring circuit board 16 is stable, and The reliability of the electrical connection between the electrical wiring 16c and the relay terminal 13 is not impaired.

Moreover, the electrical connection between the electrical wiring 16c of the printed wiring circuit board 16 and the relay terminal 13 is held by directly screwing the headed screw 17 into the combination meter case 2 made of synthetic resin. By using a self-tapping screw, it is not necessary to form a screw hole for screwing the headed screw 17 in advance, and cost can be reduced.

In the above-described structure, the dial member 14 is positioned and fixed to the combination meter case 2.
The cross-coil movement 1 is fixed to the combination meter case 2 via the connector, so that even if the fixing position of the cross-coil movement 1 slightly shifts, the flat connection of the relay terminal 13 is obtained. Part 13
The f can be inserted into the back surface of the printed circuit board 16 through the bottom of the combination meter case 2 and the terminal tip insertion holes 2c and 16a of the printed circuit board 16 after the displacement is absorbed by the deformation. In particular,
Since the insertion of the electrical connection portion 13f into the terminal tip insertion hole 2c is guided by the guide portion 2d, smooth insertion is possible even if there is some displacement.

Moreover, since the long hole 13f2 such as an oval hole is formed at the tip of the electric connection portion 13f, when the electric connection portion 13f that has passed through the terminal tip insertion holes 2c and 16a is bent. Even if there is some displacement, the electrical connection 1
The headed screw 17 can be screwed into the tapping screw hole 2f through the elongated hole 13f2 such as an oval hole and the screw insertion hole 16b of the connection land 16c1 without applying any stress to 3f or the like. Electric contact between the electric wiring of the circuit board 16, the electric connection 16c of the circuit board 16 and the electric connection portion 13f of the relay terminal 13 is stably performed, and the reliability of the electric connection is not impaired.

Further, the electrical connection portion 13f of the relay terminal 13
Is formed at the lower end of the bag-shaped insertion portion 13e by bending at a right angle in the horizontal direction and then further at a right angle downward. In the portion weakened by this, it is bent at a right angle along the back surface of the printed circuit board 16. This allows the headed screw 1 to be inserted from the lower end of the bag-shaped insertion portion 13e.
7 is formed into a U-shape by a flat plate and has a structure which can be easily deformed by an external force, so that the thermal expansion of the combination meter case 2 etc.
Even if a dimensional change due to shrinkage is applied to the relay terminal 13, the deformation of the electrical connection portion 13f absorbs the stress, and the stress does not concentrate on the screw fixing portion. Therefore, the headed screw 17 is fixed at the screw fixing portion of the relay terminal 13 due to the stress concentration.
Of the printed wiring circuit board 16 is prevented.
The contact between the electrical wiring 16c of the printed wiring circuit board 1 and the electrical connection portion 13f of the relay terminal 13 does not become unstable.
The reliability of the electrical connection between the electrical wiring 16c and the relay terminal 13 is not impaired.

In the above-described embodiment, the front end of the relay terminal 13 electrically connected to the electric wiring 16c on the back surface of the printed wiring board 16 is bent along the back surface of the printed wiring board 16 and the electrical distribution 16c is formed. The head 17a of the headed screw 17 which is inserted into the screw insertion holes 13f2 and 16b formed in the distal end portion of the relay terminal 13 and the printed wiring 16c and screwed into the meter case 2, and the back surface of the meter case 2 Between the end of the relay terminal 13 and the printed wiring 16.
By maintaining electrical contact with the terminal c, the tip of the relay terminal 13 inserted through the terminal tip insertion holes 2c and 16a is electrically connected to the electrical wiring 16c on the back surface of the printed wiring board 16. However, instead of this, the relay terminal 1
3 may be electrically connected to the electric wiring 16c on the back surface of the printed wiring board 16 by soldering,
Alternatively, the connection of the distal end of the relay terminal 13 with the electric wiring 16c on the back surface of the printed wiring board 16 may be performed via an intermediate conductive member. The conventional problem is solved by electrically connecting the tip with the electric wiring 16c.

In the above-described embodiment, the portion from the lower end of the bag-shaped insertion portion 13e to the portion fixed by the headed screw 17 is formed in a U-shape so that the structure can be easily deformed by an external force. However, it is not always necessary to form this portion in a U-shape, and even if a dimensional change due to thermal expansion or contraction is applied to the relay terminal 13, a slight margin enough to absorb this change may be provided in the middle. For example, as shown in FIG. 6, it may be formed into a substantially straight flat plate. In addition,
Although not visible in the drawing, in this case also, the electrical connection portion 13f of the relay terminal 13 corresponds to the oblong hole 13f2 and the oblong hole 13f3 such as the oblong holes of the relay terminal of FIGS. Are formed.

Also, an elongated hole 13f2 such as an oval hole for inserting a headed screw 17 formed at the lower end of the electrical connection portion 13f of the relay terminal 13 in the above-described embodiment.
7, the side edge in the longitudinal direction may be deformed toward the head 17a of the headed screw 17 to form the spring seat 13f4. By doing this, it is easy to install other parts such as spring washers,
Looseness of the headed screw 17 can be more reliably prevented.

Further, in the illustrated embodiment, the case where the printed wiring circuit board 16 disposed on the back surface of the combination meter case 2 is formed of a flexible printed wiring circuit board which is easy to handle is shown. It may be a circuit board.

[0046]

As described above, according to the electric connection structure of the instrument movement according to the first aspect, the electric wiring and the relay terminal of the printed wiring circuit board which are present outside the meter case are connected to the back surface of the printed wiring board. In this case, the electrical connection is not required, and there is no need to provide an electrical connection structure that clamps the synthetic resin meter case, and it is not necessary to provide a screw hole in the relay terminal. The electric connection between the electric wiring of the printed circuit board and the relay terminal does not become unstable, the connection of the relay terminal to the electric wiring of the printed circuit board is stable, and the electric wiring of the printed circuit board and the relay terminal The reliability of the electrical connection with the device is not impaired. Moreover, it is not necessary to form a screw hole in the relay terminal in advance, and cost can be reduced.

According to the electric connection structure of the instrument movement according to the second aspect, even if a slight displacement occurs in the fixed position of the instrument movement, the displacement is absorbed by the deformation of the flat portion of the relay terminal. It can be inserted through the meter case and the terminal tip insertion hole of the printed circuit board so as to be pulled out to the back side of the printed circuit board, and even if a dimensional change occurs thereafter, it is absorbed by the deformation of the flat plate portion. Therefore, the stress does not concentrate on the screw fixing portion, the electric wiring of the printed wiring circuit board and the electric contact between the relay terminal 13 are stably performed, and the reliability of the electric connection is not impaired. .

According to the third aspect of the present invention, the insertion of the relay terminal into the terminal tip insertion hole of the meter case is guided by the guide portion. , Smooth insertion is possible.

According to the electric connection structure of the meter movement of the fourth aspect, the head case is made of synthetic resin so that the electric wiring of the printed wiring circuit board and the relay terminal are kept in direct contact with each other. , So that the tightening force of the headed screw is maintained for a long time and does not decrease, the contact of the relay terminal with the electric wiring of the printed wiring circuit board is stable, and the electric wiring of the printed wiring circuit board is The reliability of the electrical connection between the terminal and the relay terminal is not impaired. Moreover, since the headed screw can be screwed by using the self-tapping screw, it is not necessary to previously form a screw hole for screwing the headed screw, and cost can be reduced.

According to the electric connection structure of the instrument movement according to the fifth aspect, even if there is a slight misalignment when the tip of the middle liquid terminal that has passed through the terminal tip insertion hole is bent, the weakened portion is formed. Can be bent at any position, and the screw insertion hole at the tip of the relay terminal is a long hole. It can be screwed into the meter case through the hole, and the electric contact between the electric wiring of the printed circuit board and the relay terminal can be stably performed, and the reliability of the electric connection is not impaired.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of an electrical connection structure of an instrument movement according to the present invention.

FIG. 2 is an exploded perspective view of an electrical connection structure of the instrument movement of FIG.

FIG. 3 is a plan view of a portion of the electrical connection structure of the instrument movement of FIG.

FIG. 4 is a view of a relay terminal of the instrument movement of FIG. 1 as viewed from one direction.

5 is a view of the relay terminal of the instrument movement of FIG. 1 as viewed from another direction.

FIG. 6 is a view showing a modification of the screw insertion hole of the relay terminal of FIGS. 4 and 5;

FIG. 7 is a partial sectional side view showing another embodiment of the potential connection structure of the instrument movement according to the present invention.

FIG. 8 is a side sectional view showing an example of an electrical connection structure of a conventional instrument movement.

[Explanation of symbols]

1 Instrument Movement (Cross Coil Movement) 1a Pointer Shaft 1b Pointer 2 Meter Case (Combination Meter Case) 2c Terminal Tip Insertion Hole 2d Guide 13 Relay Terminal 13f2 Screw Insertion Hole (Oval Hole) 13f3 Weakened Portion (Square Hole) 14) Dial member 16 Printed circuit board 16a Terminal insertion hole 16b Screw insertion hole 16c Electrical wiring 17 Headed screw 17a Head

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01D 11/24 G01R 1/04 G01R 5/16

Claims (5)

(57) [Claims] 1. A printed wiring in which an instrument movement is fixed to a meter case via a dial member positioned and fixed to a synthetic resin meter case, and a relay terminal of the instrument movement is arranged on a back surface of the meter case. The electrical connection of the instrument movement, which is electrically connected to the electrical wiring of the circuit board, and supplies electric power for driving the pointer attached to the pointer shaft of the instrument movement to the rotational position according to the measured amount through the electrical wiring and the relay terminal. In the structure, a terminal tip insertion hole is provided in each of the meter case and the printed wiring board, and a tip end of the relay terminal inserted through the terminal tip insertion hole is electrically connected to the printed wiring circuit board on the back surface of the printed wiring board. The electrical connection structure of the instrument movement, which is electrically connected to the instrument movement. 2. The electrical connection structure for an instrument movement according to claim 1, wherein a tip portion of said relay terminal is formed in a flat plate shape allowing deformation. 3. The instrument movement according to claim 1, wherein the meter case is provided with a guide portion for guiding the insertion of the tip of the relay terminal into the terminal tip insertion hole of the meter case. Electrical connection structure. 4. A printed circuit board wherein a front end of the relay terminal electrically connected to an electric wiring of the printed circuit board is bent along a back surface of the printed circuit board on a back surface of the printed circuit board. A head of a headed screw which is inserted into a screw insertion hole formed in each of a tip end portion of the relay terminal and a printed wiring of the printed wiring board and screwed into the meter case, and the meter case. The instrument movement according to any one of claims 1 to 3, wherein the electrical contact is held by sandwiching a front end portion of the relay terminal and a printed wiring of the printed wiring board between the rear surface of the gauge and the printed wiring board. Electrical connection structure. 5. A weakened portion for facilitating bending is formed at a tip portion of the relay terminal that is bent along the back surface of the printed wiring board, and is formed at a tip portion of the relay terminal. 5. The screw insertion hole is a long hole.
The electrical connection structure of the instrument movement according to 1.