JP3201188B2 - Connection structure between motor and substrate in optical axis adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a motor terminal and a substrate constituting a control circuit of the motor in an optical axis adjusting device having a structure in which a reflector is tilted by incorporating a motor. is there.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view showing a headlamp provided with a conventional optical axis adjusting device, which is drawn by judging a main part. FIG. 4 is a front sectional view illustrating an optical axis adjusting unit of the optical axis adjusting apparatus according to the conventional example shown in FIG. 3 described above. FIG.
As shown in FIG. 1, a lens 2 is mounted so as to cover the front opening of the lamp housing 1.
The reflector 3 is supported so as to be tiltable via a ball joint (not shown). An optical axis adjustment unit 4 is mounted on the lamp housing 1. The optical axis adjustment unit 4 of the present example has a built-in motor 4a. The illustrated 4b is:
It shows the axis of the rotation shaft of the motor, and a worm gear 4f is attached to this rotation shaft as shown in FIG. The worm gear meshes with the worm wheel 4c and drives the worm wheel 4c to rotate. The center hole of the worm wheel is formed a female screw, because screwed with the male screw 4d ₁ of the drive rod 4d, the worm wheel 4c
As the drive rod 4d rotates, the drive rod 4d moves in the axial direction (FIG. 3).
Forward and backward). In the present invention,
In the later name, the light projection direction of the headlight is set to the front.

[0003] A shaft end ball 4 is attached to the front end of the drive rod 4d.
d ₂ is being formed, and is relatively rotatably coupled to the bracket 3a of the reflector 3 via a ball joint 4e. As a result, the reflector 3 is tilted as the drive rod moves forward and backward, and the optical axis direction of the reflector is adjusted. In addition to the above-described tilt adjustment of the reflector 3 by the motor 4a, the worm wheel 4
c The turning drive rod 4d are kept stationary, can also be forward and backward the drive rod 4d by a screw action of the external thread 4d _1, so that the can execute the basic adjustment of the factory (aiming). Reference numeral 6 denotes an aiming rod bearing member. Reference numeral 7 denotes a rotation angle detection mechanism for detecting the tilt angle of the reflector, which is transmitted while reducing the rotation of the worm wheel 4c. In the prior art described above, the reflector 3 is supported so as to be tiltable with respect to the lamp housing 1, and the reflector 3 is tilted and driven by the optical axis adjusting device. However, although not shown, as a conventional example different from the above, an optical axis adjusting device of a system in which a reflector is fixed to a lamp housing, the lamp housing is supported so as to be tiltable, and the lamp housing and the reflector are tilted together. Is also used.

FIG. 5 shows a motor 4a in the conventional example shown in FIG. 4 and a substrate 10 on which a control circuit for the motor 4a is formed. FIG. The terminals 4a _{1 of the} motor 4a,
4a ₂ is connected to and electrically connected to the terminals of the substrate 10 via the harnesses 11a and 11b, respectively.

[0005]

FIG. 4 and FIG. 5 described above.
As can be understood with reference to the drawings, in the conventional example, one end of each of the harnesses 11a and 11b is connected to the motor terminal 4a.
1, 4a2, and the other end was soldered to the substrate 10 by drawing the harness. For this reason, soldering work in a narrow space requires a high degree of skill and a great deal of time and labor, and furthermore, the harness is caught in a lid-shaped casing, and the harness is pulled to cause solder peeling. There is a risk of causing trouble. Further, as shown in FIG. 5, no special consideration is given to the positional relationship between the motor terminals 4a1 and 4a2, and the path of the broken line is rationalized and the overall shape is made compact (for example, as shown in FIG. 5). There is room for improvement in the dimension W2 ).

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and (a) a motor terminal can be connected to and electrically connected to a substrate terminal without the need for soldering work.
(B) The motor and board mounting work can be performed quickly and easily, (c) the electrical connection state is stable and durable, and (d) the wiring members are a casing and a casing lid. There is no risk of being caught between
(E) It is an object of the present invention to provide an electrical connection structure that is also effective in reducing the size of the drive unit of the optical axis adjustment device.

[0007]

In order to achieve the above object (improvement of workability and quality), a connection structure between a motor and a substrate according to the present invention comprises a motor for tilting a reflector and a motor for energizing the motor. The substrate on which the circuit to be controlled is formed,
In an optical axis adjusting device installed in a synthetic resin casing, both ends bent at a substantially right angle form a leaf spring-shaped conductive plate that elastically contacts a terminal of a substrate and a terminal of a motor, respectively. And a part of the conductive plate is insert-molded in the casing. To form a leaf spring in the above configuration means not only that the shape is similar to the leaf spring, but also that it has elasticity that can function as a leaf spring. In addition, that a part is insert-molded does not necessarily mean that the part is wrapped in the casing, and it is sufficient that the part is fixed in contact with the casing.

[0008]

According to the above structure, since a part of the conductive plate is insert-molded in the casing, it is not necessary to attach and fix the conductive plate to the casing. In addition, both ends of the conductive plate form a leaf spring,
Since the terminals of the motor and the terminals of the substrate are elastically contacted, contact continuity can be obtained without the need for soldering work. That is, conduction can be obtained only by fitting the motor and the substrate to the leaf spring-like portion at the end of the conduction plate that is insert-fixed to the casing. In addition, since the contact is made elastically, the contact is maintained even if it is subjected to vibration, and there is no possibility that a conduction failure occurs. Furthermore, since there is no need for soldering as described above, no space is required for soldering work, and the entire optical axis adjustment device can be made compact.

Since the conductive plate is partially positioned with respect to the casing by insert molding, there is no possibility that a trouble such as being sandwiched between the casing and the lid will occur. Also, since no soldering work is required, there is no risk of causing thermal damage near the terminals, and special assembling work is not required, so-called one-touch assembly is possible.

[0010]

Next, referring to FIGS. 1 and 2 together,
An embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view of a drive unit portion of an optical axis adjusting device having one embodiment of a connection structure between a motor and a substrate according to the present invention, as viewed in a direction parallel to a rotation axis of the motor. , And is not necessarily a realistic projection view of the embodiment. FIG. 2 is a schematic cross-sectional view of the drive unit of the embodiment shown in FIG. 1 as viewed from a direction perpendicular to the rotation axis of the motor, and is not necessarily a realistic projection view. The portion where the conductive plate insert-molded to the casing is covered and hidden by the casing is also drawn in the figure as shown in the figure. (See FIG. 1) A motor 9b and a substrate 10 are housed in a casing 9a of an optical axis adjustment unit (also called a drive unit) 9. The rotational output of the motor 9b is transmitted to a drive rod 9d via a reduction gear group 9c, and the drive rod 9d is moved forward and backward in a direction perpendicular to the plane of the drawing. A female screw is formed in the center hole of the drive rod 9d, and the male screw rod 9e is screwed thereto. When the male screw rod 9e is turned, the drive rod 9d is turned.
Forward and backward relative to. This function is used for aiming (initial value setting of optical axis adjustment). A stopper / guide piece 9f protrudes laterally from the drive rod 9d, and the guide surfaces 9a ₁ and 9a ₂ prevent rotation around the axis and guide parallel movement in a direction perpendicular to the paper surface. . (See mainly FIG. 1 and FIG. 2 together.) Terminals 9b ₁ and 9b _{2 of} motor 9b
Are provided to the terminals of the substrate 10, respectively. The conductive plates 12 and 13 of this example are formed by punching a phosphor bronze plate into an elongated shape, and bending the vicinity of both ends of the plate at substantially right angles. The center portions 12a and 13a of the conductive plates 12 and 13 having both ends bent are embedded and fixed in the casing 9a by insert molding. As a result, the ends of the conductive plates 12 and 13 facing the motor 9b have the motor spring pieces 12b and 13b rising from the bottom surface of the casing 9a by the height H. It is formed and elastically contacts and conducts with the terminals 9b ₁ and 9b ₂ of the motor 9b.

[0011] Similarly, the conductive plate A12 and the conductive plate A13
The ends facing the substrate 10 are formed with substrate spring pieces 12c and 13c rising from the bottom surface of the casing 9a by the height dimension h so as to be in contact with the terminals of the substrate 10,
Conducted.

With the above construction, there is no need to attach the conductive plates 12 and 13 to the casing 9a, and the central portion thereof is positioned and fixed by insert molding. Just by inserting the substrates 10, respectively, the conductive plates 12 and 13 are brought into contact with each other to achieve conduction, and no soldering work is required.

(Refer to FIG. 1.) The force of elastically pressing the motor spring piece 12b of the conductive plate / instep 12 against the motor terminal 9b2 and the motor spring piece 13b of the conductive plate / part 13 are connected to the motor terminal 9b1. It is desirable that the force to be elastically pressed against the pressure is equal. For this reason, the rising height of the motor spring piece 12b and the rising height of the motor spring piece 13b are set to H. Similarly, the rising dimension of the board spring piece 12c and the rising dimension of the board spring piece 13c are set to h. An inevitable result of the above configuration is that the two terminals 9b of the motor 9b
1 and 9b2 are positioned at the same height with respect to the bottom surface of the casing 9a, and are arranged in parallel with the plate surface of the substrate 10. In general, the cross-sectional shape of the motor is not necessarily circular, but has a major axis direction and a minor axis direction. In this embodiment, as shown in FIG. 1, the arrangement direction of the two terminals 9b1 and 9b2 is changed to the motor 9b. In the minor axis direction. Thereby, the motor 9
The overall width W1 including the substrate b and the substrate 10 is shorter than the overall width W2 in the conventional example shown in FIG. In addition, the conductive plate / A12 and the conductive plate /
Since it is positioned and fixed with respect to a by insert molding, there is no possibility that a member for conduction (such as a conduction plate or a harness) is sandwiched between the casing 9a and the casing lid 9g. Furthermore, two motor spring pieces 1
Since the motors 2b and 13b have the same height (dimension H), the motor 9b is inserted into the casing 9a and its terminals 9b
It is easy to bring the motor spring pieces 1 and 9b2 into contact with the motor spring pieces 13b and 12b, respectively. For the same reason, the work of assembling the substrate 10 is also easy. The motor 9 inserted into the casing 9a and covered by the casing lid 9g
b denotes a motor supporting rib 9 provided on a casing 9a.
a 1 and a motor supporting rib 9g1 provided on the casing lid 9g. In this way, mechanical support and electrical continuity of the motor 9b are performed very easily and quickly.

[0014]

According to the present invention, since a part of the conductive plate is insert-molded in the casing, it is not necessary to attach and fix the conductive plate to the casing. In addition, since both ends of the conductive plate bent at a substantially right angle form a leaf spring and are in elastic contact with the terminals of the motor and the terminals of the substrate, no soldering work is required. Contact conduction is obtained. That is, conduction can be obtained only by fitting the motor and the substrate to the leaf spring-like portion at the end of the conduction plate that is insert-fixed to the casing. In addition, since the contact is made elastically, the contact is maintained even if it is subjected to vibration, and there is no possibility that a conduction failure occurs. Furthermore, since there is no need for soldering as described above, no space is required for soldering work, and the entire optical axis adjustment device can be made compact.

Since the conductive plate is partially positioned with respect to the casing by insert molding, there is no possibility that a trouble such as being sandwiched between the casing and the lid will occur. Also, since there is no need for soldering work, there is no risk of causing thermal damage near the terminals, and no special skill is required for the assembly work, so that an excellent practical effect that so-called one-touch assembly is possible. Play.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a drive unit portion of an optical axis adjusting device having one embodiment of a connection structure between a motor and a substrate according to the present invention, as viewed in a direction parallel to a rotation axis of the motor. Therefore, it is not necessarily a realistic projection view of the embodiment because it is schematically drawn.

FIG. 2 is a schematic cross-sectional view of the drive unit of the embodiment shown in FIG. 1 as viewed from a direction perpendicular to the rotation axis of the motor, and is not necessarily a realistic projection view, ,
The portion where the conductive plate insert-molded to the casing is covered and hidden by the casing is also depicted in the figure as it appears.

FIG. 3 shows a headlamp provided with a conventional optical axis adjusting device;
FIG. 4 is a vertical cross-sectional view of a main part cut away.

4 is a front sectional view illustrating an optical axis adjusting unit of the optical axis adjusting apparatus according to the conventional example shown in FIG. 3 described above.

FIG. 5 is a motor 4a in the conventional example shown in FIG.
FIG. 2 is a diagram in which a wiring member is added to an end view of the substrate 10 on which a control circuit of the motor 4a is formed and which is viewed in the direction of arrow A.

[Explanation of symbols]

1 lamp housing, 2 lens, 3 reflector
3a ... Bracket, 4 ... optical axis adjusting unit (aka, the drive unit), 4a ... motor, 4a _1, 4a ₂ ... motor terminals, 4b ... motor axis, 4c ... worm wheel 4
d: drive rod, 4d ₁ : male screw, 4d ₂ : shaft end ball,
4e: ball joint, 4f: worm gear, 5: initial aiming rod, 6: aiming rod bearing, 7: rotation angle detecting mechanism, 9: optical axis adjustment unit, (also called drive unit), 9a: casing, 9b: motor, 9b _1, 9
b ₂ ... motor terminals, 9c ... reduction gear group, 9d ... drive rod, 9e ... male screw rod, 9f ... stopper and the guide piece, 9
g ... casing lid, 9 g ₁ ... motor support rib, 10 ...
Substrates, 11a, 11b: Harness, 12: Conducting plate / upper,
12a: insert part, 12b: motor spring piece, 12
c ... Spring piece for board, 13 ... Conducting plate / b, 13a ... Insert part, 13b ... Spring piece for motor, 13c ... Spring piece for board.

Claims (1)

(57) [Claims] A motor for tilting a reflector and a substrate on which a circuit for controlling energization of the motor are formed are bent at a substantially right angle in an optical axis adjusting device installed in a synthetic resin casing. A conductive plate in the form of a leaf spring is provided, the ends of which are elastically in contact with the terminals of the board and the terminals of the motor, respectively, and a part of the conductive plate is inserted into the casing. A connection structure between a motor and a substrate in an optical axis adjustment device, which is formed by molding.