JP3582752B2 - Assembly structure of electric instrument movement - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an assembling structure of an electric instrument movement such as a cross-coil type movement, and particularly, to a contact receiving piece provided on a printed wiring circuit board disposed on the back of a synthetic resin meter case. The contacts of the motorized instrument movement housed and fixed in the meter case are inserted from the inside of the meter case and electrically connected, and an electric signal is supplied to the instrument movement via the contact receiving piece and the contact. The present invention relates to an assembling structure of an electric instrument movement which is installed so as to supply electric power for driving a pointer attached to a shaft to a rotational position according to a measured amount such as a vehicle speed.
[0002]
[Prior art]
Conventionally, as this type of assembling structure, there has been one shown in FIG. 5 (partially broken side view) and FIG. 6 (exploded view). In the figure, a cross-coil type movement 1 as an instrument movement includes a magnet rotor having NS poles magnetized radially in a space of a hollow coil bobbin around which a pair of coils 1a are wound so as to cross each other on the outer periphery. The magnet rotor is rotatably arranged, and a current whose magnitude changes in accordance with the measured amount is passed through the pair of coils 1a. At this time, the magnet rotor is moved so that the NS poles coincide with the combined magnetic field direction obtained by combining the magnetic fields generated by the respective coils. The magnet 1 is configured to be rotated, and the rotating shaft of the magnet rotor is used as the pointer shaft 1b, and the pointer 1c attached thereto is driven to a rotational position corresponding to the measured amount.
[0003]
The coil wound around the coil bobbin is accommodated in a magnetic shielding case 11 that blocks internal and external magnetic interference. A support portion 12 is integrally formed 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 13 a of a contact 13 held by the support portion 12. It is soldered and electrically connected. The upper end 13a of the contact 13 to which the coil ends are electrically connected is bent, but is straight when each coil end is wound.
[0004]
The entire cross-coil movement 1 is configured such that a fixing screw 15 inserted from the front side of the dial member 14 constituted by the dial 14a on the front side and the light guide plate 14b on the rear side is screwed to the support 12. Thus, it is fixed to the back surface of the dial member 14. The cross-coil movement 1 has a pointer shaft 1b that is driven to a rotational position in accordance with the measured amount when a current of which magnitude changes according to the measured amount is applied to each coil. The dial member 14 to which is fixed is provided with a hole 14c so that the tip of the pointer shaft 1b can pass through to the front side of the dial 14a. The pointer 1c is press-fitted and fixed to the pointer shaft 1b, and indicates the measurement amount in cooperation with the scale of the dial 14a.
[0005]
The attachment of the cross-coil type movement 1 to the combination meter case 2 can be performed, for example, by mounting the dial member 14 to a plurality of positioning holes (not shown) formed in the periphery of the light guide plate 14b at the periphery of the combination meter case 2 made of synthetic resin. This is performed by fitting positioning pins (not shown) protruding from the respective parts and fixing them with fixing screws (not shown), whereby the cross-coil movement 1 is positioned and fixed to the combination meter case 2. Is done. Of course, the cross-coil movement 1 may be directly fixed to the inside of the bottom of the combination meter case 2 by a fixing screw.
[0006]
The lower end of the contact 13 is formed in a pin shape by forming a plate piece or cutting a round bar, and the lower end of the contact 13 penetrates the bottom of the combination meter case 2 from the outside of the case to the case hole 2b. Is inserted into the contact receiving piece 3 inserted through the contact hole. The contact receiving piece 3 stands upright on a printed circuit board 4 arranged on the outer surface of the bottom of the combination meter case 2. Since the printed wiring circuit board 4 supplies power to flow a current of which magnitude changes according to the measured amount to each coil of the cross-coil movement 1, the resist layer is printed on the insulating substrate except for a portion to be electrically connected. Having electrical wiring covered by the wire. The leg 3a of the contact receiving piece 3 erected on the printed wiring board 4 is inserted into the terminal insertion hole 4a of the printed wiring board 4 from the upper surface side, and is soldered to the electric wiring on the back surface. Electrically and mechanically on the insulating substrate. The printed circuit board 4 is positioned and fixed to the outer surface of the bottom of the combination meter case 2 by a fixing screw (not shown) or the like, whereby the contact receiving piece 3 is positioned and fixed to the combination meter case 2 via the printed circuit board 4. Will be done.
[0007]
An opening 3b for receiving the lower end of the contact 13 is formed in the head of the contact receiving piece 3, and an elastic piece 3c for elastically contacting the outer periphery of the received contact 13 is integrally formed in the opening 3b. As a result, power is supplied to each coil of the cross-coil movement 1 via the electric wiring of the printed wiring circuit board 4, the contact receiving piece 3, and the contact 13.
[0008]
Although not shown, at the bottom of the combination meter case 2 is provided a light source which is turned on by being supplied with power through the electric wiring of the printed circuit board 4, and the light from this light source is, for example, the edge of the light guide plate 14b. The light is introduced from a light introducing unit provided in the unit, is guided through the light guide plate 14b, and is irradiated on the back surface of the dial 14a. The dial 14a is illuminated by passing through to the front side, so that the scale and the like can be visually recognized even when the surroundings are dark such as at night.
[0009]
[Problems to be solved by the invention]
In the above-described conventional structure, when the cross-coil movement 1 is positioned and fixed in the combination meter case 2 and assembled, the contact 13 of the cross-coil movement 1 is provided upright on the printed wiring circuit board 4. 3, it is necessary to make electrical connection. However, if the contact 13 is slightly displaced with respect to the contact receiving piece 3, as shown in FIG. In many cases, the contact 13 is inserted completely into the contact receiving piece 3 at one time, and this largely depends on the skill of the assembling operator. Such a tendency is that when the assembling work is performed in a state where the cross-coil movement 1 is fixed to the back surface of the dial member 14, the entire cross-coil movement 1 is shaded by the dial member 14, Since the contact 13 and the contact receiving piece 3 of the combination meter case 2 cannot be directly viewed, there is a problem that the contact 13 and the contact receiving piece 3 are particularly strengthened and the assembling workability is deteriorated.
[0010]
Accordingly, the present invention has been made in view of the above-described conventional problems, and performs mutual electric wiring by inserting the contacts of the instrument movement into the contact receiving pieces raised on the printed wiring circuit board arranged on the back of the meter case. An object of the present invention is to provide an assembling structure of a motor-driven instrument movement that improves the assembling workability when assembling the instrument movement to a meter case.
[0011]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a conductive type instrument movement assembling structure, wherein the instrument movement is positioned and fixed to the bottom of a synthetic resin meter case, and the contact of the instrument movement is provided. A contact is inserted into a contact receiving piece erected on a printed circuit board disposed outside the bottom of the meter case, and is electrically connected to the electric wiring of the printed circuit board. And an assembling structure of the electric instrument movement configured to supply power for driving a pointer attached to the pointer shaft of the instrument movement to a rotation position according to a measured amount through the contact, at least corresponding to the contact receiving piece. At the position where the bottom of the meter case is partially projected inward, the projection is partially recessed from the outside to accommodate the contact receiving piece. An insertion part which is formed with a concave part and which substantially penetrates the convex part and the concave part, substantially coincides with the axis of the contact receiving piece accommodated in the concave part, and inserts the insertion part at the lower end of the contact to the contact receiving part. A hole is formed, and the opening of the insertion hole on the side of the convex portion is enlarged in a conical shape.
[0012]
In this structure, the contacts included in the instrument movement positioned and fixed to the bottom of the meter case made of synthetic resin are inserted into the contact receiving pieces standing upright on the printed circuit board disposed outside the bottom of the meter case, and the printing is performed. It is electrically connected to the electric wiring of the printed circuit board, and power is supplied to drive the pointer attached to the pointer shaft of the instrument movement to the rotating position according to the measured amount through the electric wiring, contact receiving piece and contact. The structure for supplying the drive current to the electric instrument movement has become extremely simple.
[0013]
In addition, at least in the portion of the meter case corresponding to the contact receiving piece, the convex portion is formed by partially projecting the bottom of the meter case inward, and the concave portion for accommodating the contact receiving piece by partially depressing from the outside is formed. Each formed, through the convex portion and the concave portion, substantially coincides with the axis of the contact receiving piece housed in the concave portion, forming an insertion hole for inserting the insertion portion at the lower end of the contact to the contact receiving portion, In addition, the opening on the convex side of the insertion hole is enlarged in a conical shape.
[0014]
Therefore, when trying to insert the insertion portion at the lower end of the contact through the insertion hole to the contact receiving piece, the axis of the insertion portion at the lower end of the contact does not match the axis of the insertion hole, that is, the axis of the contact receiving piece. However, if it is within the range of the opening, the insertion portion at the lower end of the contact is guided by the inclined surface of the opening enlarged in a conical shape so as to coincide with the insertion hole.
[0015]
In order to solve the above-mentioned problem, in the assembling structure of the electric instrument movement according to claim 2 made according to the present invention, the area of the opening that is enlarged in a conical shape is wider than at least the opening of the contact receiving piece. It is characterized by.
[0016]
In this structure, since the area of the opening conically expanded is at least larger than the opening of the contact receiving piece, the deviation between the axis of the insertion portion at the lower end of the contact and the insertion hole, that is, the axis of the contact receiving piece is large. Also, the insertion portion at the lower end of the contact is drawn into the insertion hole and guided so as to coincide with the insertion hole.
[0017]
According to a third aspect of the present invention, there is provided a motorized instrument movement assembly structure according to the present invention, wherein the convex portion has a flat surface around the conically enlarged opening. I have.
[0018]
In this structure, since the flat surface is provided around the conically enlarged opening, the axis of the insertion portion at the lower end of the contact and the axis of the insertion hole, that is, the axis of the contact receiving piece, are out of the range of the opening. When the tip of the insertion part is greatly displaced so as to be located, it comes to ride on the flat part, and in this state, the instrument movement can be translated so as to enter the range of the opening, and then inserted Guided to match the hole.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are a side view and an exploded view showing an embodiment of an assembling structure of a conductive type instrument movement according to the present invention, with a part thereof cut away, and FIG. 5 and FIG. The same reference numerals are given to the same parts as the conventional ones.
[0020]
A cross-coil type movement 1 as a conductivity type instrument movement has a magnet rotor (not shown) rotatably arranged in a space of a hollow coil bobbin around which a pair of coils 1a are wound so as to intersect with each other on the outer periphery. The magnet rotor is rotated to a rotational position corresponding to the measured amount by passing an electric current whose magnitude changes in accordance with the measured amount, and the rotating shaft of the magnet rotor is used as the pointer shaft 1b, and the pointer 1c attached thereto is adapted to the measured amount. It is configured to drive to the designated position.
[0021]
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 a so as to protrude outside the magnetic shielding case 11. Each support portion 12 holds two contacts 13 and screw-supports the cross-coil movement 1 to a dial member 14 composed of a dial 14a and a light guide plate 14b with a fixing screw 15 composed of a tapping screw. The support portion 12 has a terminal insertion hole (not shown) for holding the contact 13 and a tapping screw hole.
[0022]
As the contact 13, for example, a brass sheet having a thickness of about 0.3 mm formed by sheet metal forming and having a surface plated with tin is used. The contact 13 is shaped so as to have a narrow coil winding portion 13a at the upper end and an insertion portion 13b formed in a bag shape at the lower end. When the coil winding portion 13a of the contact 13 inserted along the longitudinal direction of the pointer shaft 1b is completely removed above the support portion 12, a part of the insertion portion 13b is inserted into the terminal insertion hole of the support portion 12. It is formed in a shape that stops when it hits.
[0023]
The contact 13 is temporarily fixed to a state held in the terminal insertion hole by the coil winding portion 13a passing through the terminal insertion hole and coming out of the support portion 12, and in this state, the coil winding portion 13a is fixed to the coil winding portion 13a. After the coil ends are wound and then soldered and electrically connected, they are bent at substantially right angles and permanently fixed as shown in the figure.
[0024]
The entire cross-coil movement 1 constitutes the dial member 14 together with the light guide plate 14b on the back side. The fixing screw 15 inserted from the front side of the dial 14a on the front side is inserted into the tapping screw hole of the support portion 12. By being screwed together, it is fixed to the back surface of the dial member 14. The pointer 1c is press-fitted into the pointer shaft 1b of the fixed cross-coil type movement 1 through the front end of the dial 14a through the hole 14c formed in the dial 14a and the light guide plate 14b. Fixed. When a current varying in magnitude according to the measured amount is applied to each coil of the cross-coil type movement 1, the pointer 1c is driven to a rotating position in accordance with the measured amount together with the pointer shaft 1b, and the scale of the dial 14a, etc. Instruct the measured quantity in cooperation with.
[0025]
The dial member 14, to which the cross-coil movement 1 is fixed on the back side, has a positioning hole formed in a boss formed in the periphery of the light guide plate 14b and protruding from the peripheral edge of the combination meter case 2 made of synthetic resin. After the pins are fitted, the positioning is fixed to the combination meter case 2 by fixing with fixing screws (not shown) or the like. The positioning and fixing of the dial member 14 positions the cross-coil movement 1 with respect to the combination meter case 2. Is also performed.
[0026]
On the printed wiring circuit board 4 disposed on the outside of the bottom of the combination meter case 2, that is, on the back surface, the contact receiving piece 3 formed in a substantially cylindrical shape is provided upright. Since the printed wiring circuit board 4 supplies power to flow a current of which magnitude changes according to the measured amount to each coil of the cross-coil movement 1, the resist layer is printed on the insulating substrate except for a portion to be electrically connected. Having electrical wiring covered by the wire. The contact receiving piece 3 erected on the printed wiring circuit board 4 has its legs 3a inserted into the terminal insertion holes 4a and is soldered to the electric wiring on the back surface, so that the contact receiving piece 3 is electrically and mechanically mounted on the insulating substrate. Is combined with The printed wiring circuit board 4 is positioned and fixed to the back surface of the combination meter case 2 by a fixing screw (not shown) or the like, whereby the contact piece 3 is positioned and fixed to the combination meter case 2 via the printed wiring circuit board 4. Become so.
[0027]
On the other hand, the bottom of the combination meter case 2 is partially protruded inward at a portion corresponding to the contact receiving piece 3 erected on the printed wiring circuit board 4 positioned and fixed to the bottom. The convex portion 2c having a flat upper surface is partially depressed from the outside to form a concave portion 2d. The recess 2d accommodates a contact receiving piece 3 formed in a substantially cylindrical shape and standing on the printed wiring circuit board 4. An insertion hole 2e is formed at the center of the projection 2c and the depression 2d so as to penetrate them and substantially coincide with the axis of the contact receiving piece 3 housed in the depression 2d. The insertion portion 13b at the lower end is inserted to the contact receiving piece 3.
[0028]
The opening of the insertion hole 2e on the concave portion 2d side is formed slightly larger than the diameter of the insertion portion 13b at the lower end of the contact 13, and the opening 2f on the convex portion 2c side is larger than at least the opening 3b of the contact receiving piece 3. Are enlarged conically so as to leave a flat surface 2g therearound. Thus, when the insertion portion 13b at the lower end of the contact 13 is to be inserted through the insertion hole 2e to the contact receiving piece 3, the axis of the insertion portion 13b at the lower end of the contact 13 and the insertion hole 2e, that is, the contact Even if the axis of the receiving piece 3 does not match as shown in FIG. 3, if it is within the range of the opening 2f, it is guided by the inclined surface of the opening 2f which is enlarged in a conical shape, and finally the contact 13 The insertion portion 13b at the lower end of the contact hole reaches the opening of the contact piece 3 through the insertion hole 2e. The opening 2f may have a pyramid shape instead of a conical shape. In short, the opening 2f only needs to have an inclined surface for guiding the insertion portion 13b at the lower end of the contactor 13 shifted to the insertion hole 2e.
[0029]
Further, even if the insertion portion 13b at the lower end of the contact 13 to be inserted into the contact receiving piece 3 through the insertion hole 2e is out of the range of the opening 2f, as shown in FIG. When the tip of the insertion portion 13b at the lower end of the contact 13 rides on the flat surface 2g around the conically enlarged opening 2f, the cross-coil movement 1 is moved in parallel in this state, thereby opening the opening. 2f. Once inside the range, the insertion portion 13b at the lower end of the contact 13 is finally guided by the inclined surface and passes through the insertion hole 2d. The opening of the receiving piece 3 is reached.
[0030]
As described above, after the insertion portions 13b at the lower ends of all the contacts 13 of the cross-coil movement 1 are inserted into the contact receiving pieces 3 of the printed wiring circuit board 4 disposed outside the bottom of the combination meter case 2, By positioning and fixing the dial member 14 at a position (not shown), the cross-coil movement 1 is positioned and fixed inside the bottom of the combination meter case 2 and each contact 13 of the cross-coil movement 1 is connected to a printed circuit board. The power supply is electrically connected to the electrical wirings 16 and supplies a current of which magnitude changes according to the measured amount to each coil of the cross-coil movement 1 via the electrical wiring of the printed wiring circuit board 4 and the contact 13. Become like
[0031]
In the above-described structure, the bottom portion is partially projected inward at the bottom portion of the meter case corresponding to the contact receiving piece 3 erected on the printed circuit board 4 positioned and fixed outside the bottom portion of the meter case 2. The protrusion 2c is partially recessed from the outside to form recesses 2d for accommodating the contact receiving pieces 3, respectively. The contact receiving pieces 3 penetrating the protrusions 2c and the recesses 2d and accommodated in the recesses 2d are formed. An insertion hole 2e is formed which is substantially coincident with the axis and allows the insertion portion 13b at the lower end of the contact 13 to pass through to the contact receiving piece 3. The opening 2f of the insertion hole 2e on the side of the convex portion 2c is enlarged in a conical shape. Therefore, when trying to insert the insertion portion 13b at the lower end of the contact 13 through the insertion hole 2d to the contact receiving piece 3, the axis of the insertion portion 13b at the lower end of the contact 13 and the insertion hole 2e, that is, the contact receiving portion 3 The axis of piece 3 does not match Also, if it is within the range of the opening 2f, it is guided by the inclined surface of the opening 2f that is enlarged in a conical shape, and finally the insertion portion 13b at the lower end of the contact 13 passes through the insertion hole 2e and the contact receiving piece. 3 and the workability of assembling the cross-coil movement 1 is improved.
[0032]
In particular, since the area of the opening which is conically enlarged is wider than at least the opening of the contact receiving piece, workability is improved as compared with a case where the insertion portion 13b at the lower end of the contact 13 is directly inserted into the contact receiving piece 3. .
[0033]
In addition, the axis of the insertion portion 13b at the lower end of the contact 13 and the insertion hole 2e, that is, the axis of the contact receiving piece 3 are greatly displaced, and the tip of the insertion portion 13b at the lower end of the contact 13 is located outside the range of the opening 2f. Then, it comes to ride on the flat surface 2g around the conical-shaped enlarged opening 2f. In this state, the cross-coil movement 1 is moved in parallel so as to fall within the range of the opening 2f. After entering the range once, it is guided by the inclined surface so that the insertion portion 13b at the lower end of the contact 13 finally reaches the opening of the contact receiving piece 3 through the insertion hole 2d. Therefore, the workability of assembling the cross-coil movement 1 is further improved.
[0034]
In the illustrated embodiment, the convex portions and the concave portions are respectively formed at the portions corresponding to the respective contact receiving pieces 3, but they may be combined into one to form one convex portion and the concave portion. That is, one convex portion corresponding to one concave portion accommodating all of the plurality of contact receiving pieces 3 may be used.
[0035]
【The invention's effect】
As described above, according to the assembling structure of the instrument movement according to the first aspect, when the insertion portion at the lower end of the contact is to be inserted to the contact receiving piece through the insertion hole, the lower end of the contact is inserted. Even if the axis of the part does not coincide with the axis of the insertion hole, that is, the axis of the contact receiving piece, if it is within the range of the opening, the insertion part at the lower end of the contact is inserted into the insertion hole by the inclined surface of the opening that is conically expanded. , So that the insertion part at the lower end of the contact finally reaches the opening of the contact receiving piece through the insertion hole, and the workability of assembling the cross-coil movement is improved. Become like
[0036]
According to the assembling structure of the instrument movement according to claim 2, the area of the opening enlarged in a cone shape is at least larger than the opening of the contact receiving piece, and the axis of the insertion portion at the lower end of the contact and the insertion hole, that is, the contact. Even if there is a large deviation from the axis of the receiving piece, the insertion part at the lower end of the contact is drawn into the insertion hole and guided so as to match the insertion hole, so that the lower end of the contact is inserted into the contact receiving piece. Workability is improved as compared with the case where the part is directly inserted.
[0037]
According to the assembling structure of the instrument movement according to the third aspect, the flat surface is provided around the opening which is enlarged in a conical shape, and the axis of the insertion portion at the lower end of the contact and the axis of the insertion hole, that is, the axis of the contact receiving piece. However, when the tip of the insertion part at the lower end of the contact is largely displaced out of the range of the opening, it comes to ride on the flat part, and in this state, the instrument movement is translated to within the range of the opening. Since it can be inserted into the hole and then guided to match the insertion hole, the workability of assembling the cross-coil movement is further improved.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an embodiment of an instrument movement assembling structure according to the present invention.
FIG. 2 is an exploded view of an assembly structure of the instrument movement of FIG. 1;
FIG. 3 is a partial cross-sectional view for explaining an operation and effect obtained by an assembling structure of the instrument movement of FIG. 1;
FIG. 4 is a partial cross-sectional view for explaining another operation and effect of the assembling structure of the instrument movement of FIG. 1;
FIG. 5 is a side view showing a partially assembled structure of a conventional instrument movement.
FIG. 6 is an exploded view of an assembling structure of the conventional instrument movement of FIG.
7 is a side view, partially broken away, showing a problem of an assembling structure of the instrument movement of FIG. 5;
[Explanation of symbols]
1 motorized instrument movement (cross-coil movement)
1b Pointer shaft 1c Pointer 13 Contact 2 Meter case (combination meter case)
2c convex portion 2d concave portion 2e insertion hole 2f opening 2g flat surface 3 contact receiving piece 4 printed wiring circuit board

Claims (3)

An instrument movement is positioned and fixed to the bottom of a synthetic resin meter case, and the contacts of the instrument movement are inserted into contact receiving pieces standing upright on a printed wiring circuit board arranged outside the bottom of the meter case. The power supply is electrically connected to the electric wiring of the printed wiring circuit board, and the electric wiring drives the pointer attached to the pointer shaft of the instrument movement through the electric contact, the contact receiving piece and the contact to a rotation position corresponding to the measured amount. In the assembly structure of the electric instrument movement
At least in a portion corresponding to the contact receiving piece, a convex portion is formed by partially projecting a bottom portion of the meter case inward, and a concave portion for accommodating the contact receiving piece by partially depressing from the outside is formed. Then, an insertion hole which penetrates through the convex portion and the concave portion, substantially coincides with the axis of the contact receiving piece housed in the concave portion, and inserts the insertion portion at the lower end of the contact to the contact receiving piece is formed. ,
An assembling structure for a motor-driven instrument movement, wherein an opening 2f of the insertion hole on the side of the convex portion is enlarged in a conical shape. 2. The assembly structure for an electric instrument movement according to claim 1, wherein an area of the conically enlarged opening is larger than at least an opening of the contact receiving piece. The assembly structure of an electric instrument movement according to claim 1, wherein the convex portion has a flat surface around the conically enlarged opening.

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