JPH0437554B2 - - Google Patents

Description

[Detailed description of the invention]

【0001】

[Field of Industrial Application] The present invention relates to an adjustment resistor terminal suitable for automatically mounting a cylindrical adjustment resistor on a printed circuit board. This invention relates to a terminal for adjusting resistance that can be automated.

[0002]

[Prior Art] Generally, when various electronic components such as diodes, transistors, integrated circuits, etc. are mounted on a printed circuit board, in order to adjust voltage errors of each electronic component, adjustment resistors are installed at one location on the printed circuit board. I try to wear it.

[0003] Therefore, FIG. 7 shows an example in which a conventional adjustment resistor is mounted on a printed circuit board.

[0004] In the figure, 1 indicates a printed circuit board, on which a printed wiring (not shown) or the like with a predetermined pattern is formed, and in the middle of this printed wiring, for example, a diode, a transistor, an integrated circuit, etc. are formed. Electronic components (not shown) such as circuits are attached thereto. In order to adjust the voltage error of each electronic component, mounting parts 2, 2 for adjustment resistors are formed in one place on the printed circuit board 1 with small holes, and each of the mounting parts 2 is connected to the It is designed to be connected to each electronic component via printed wiring.

[0005] Reference numerals 3 and 3 indicate adjustment resistors each having a predetermined resistance value, and each adjustment resistor 3 is formed in the shape of a gourd with a length of about 6 mm, for example.
Leads 3A, 3A of a predetermined size are protruded in the shape of pins from both ends thereof. And each lead 3A
The diameter is, for example, about 0.5 mm.

[0006] Reference numerals 4 and 4 indicate terminals for attaching each of the adjustment resistors 3 to the printed circuit board 1, each of which is made of a conductive metal material, and has a base portion 4A having a substantially U-shaped cross section. and the base 4
A pair of arm portions 4B, 4B formed by bending so as to protrude into a substantially V-shape on both sides of A, and a terminal pin 4 integrally protruding downward from the lower end side of the base portion 4A.
Terminal pin 4C of each terminal 4
are mounted in the small holes of each of the mounting portions 2 and fixed by soldering or the like. Each adjusting resistor 3 is inserted into the terminal 4 in the direction of the arrow in FIG. 7, and each lead 3A of each adjusting resistor 3 is latched between each base 4A and each arm 4B. It's getting old.

[0007] The conventional technology has the above-mentioned configuration, and each lead 3A of each adjustment resistor 3 is latched between the base 4A of each terminal 4 and each arm 4B by soldering or the like. The adjusting resistors 3 are fixed to the relevant parts to prevent each adjusting resistor 3 from falling off due to vibrations during driving, for example, when mounted on an automobile or the like. Thus, printed circuit board 1
Each adjustment resistor 3 mounted above adjusts voltage errors and the like of each electronic component, and supplies a predetermined voltage to each electronic component.

[0008]

[Problems to be Solved by the Invention] However, the above-mentioned conventional technology has the following drawbacks.

[0009] First, since each lead 3A is provided on both ends of the adjustment resistor 3, the overall length becomes long, and it is necessary to take a large interval between each terminal 4, so that other terminals on the printed circuit board 1 are In order to prevent short-circuit accidents with other electronic components, it occupies a relatively large area, making it impossible to increase the mounting density of each electronic component on the printed circuit board 1.

[0010] Also, each terminal 4 has each adjustment resistor 3
With the adjustment resistor 3 attached, the base 4A etc.
This protrudes unnecessarily from the printed circuit board 1 and takes up an unnecessarily large space when the printed circuit board 1 is mounted on a control panel or the like. Since each lead 3A of each adjustment resistor 3 is formed to protrude greatly in the axial direction and have a small diameter,
It is easy to misalign in the axial direction with respect to each terminal 4, making it difficult to automate soldering and the like.

[0011] In order to solve the above drawbacks, it has recently been proposed to use a Melf resistor 10 as shown in FIG. 1, which will be described later, instead of the adjustment resistor 3. The terminal for attachment is almost the same as the terminal 4 described above, and there are problems such as automatic attachment of the MELF resistor 10, etc., lowering of positioning accuracy with respect to the terminal, and difficulty in automated soldering.

[0012] The present invention was made in view of the drawbacks of the prior art described above, and the present invention can automatically attach a cylindrical adjustment resistor such as a Melf resistor, improve positioning accuracy, and eliminate soldering etc. The purpose of the present invention is to provide a terminal for adjusting resistors that can be automated and that can significantly improve the mounting density of printed circuit boards.

【0013】

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an adjustment resistor formed in a cylindrical shape and provided with electrodes on the outer periphery of both ends, in order to mount it on a printed circuit board. A terminal for adjusting resistance formed of a metal plate, which includes a support part on the flat plate, an inner surface extending upwardly from the support part to the left and right, and facing each other in the left and right directions. At least a pair of left and right front side clamping parts formed in a concave curved shape corresponding to the outer peripheral surface of the electrode of the adjustment resistor, and a pair of front side clamping parts facing each front side clamping part at a predetermined distance rearward from each front side clamping part. , left and right rear side clamping parts whose inner surfaces facing each other in the left and right directions are formed in a concave curved shape corresponding to the electrode outer peripheral surface of the adjustment resistor; Left and right connecting portions extending in the front and rear directions and spaced apart from each other in the left and right directions to be connected to the upper end of the front holding portion; a guide part formed at the upper end of the inner surface of the holding part and the upper end of the inner side of the rear holding part, and guiding the electrode between each of the front holding parts and between each rear holding part; and each of the front holding parts. A notch is formed in the support part so as to cut out downward between the two, and provides spring properties to each of the front side clamping part and each rear side clamping part, and a notch part protrudes downward from the lower end side of the support part, and the notch part is formed in the support part so as to cut out the space between the front and rear side clamping parts downward. It adopts a configuration consisting of terminal pins that are attached to the board.

【0014】

[Operation] With the above configuration, the electrode of the adjustment resistance is inserted from above through each guide part between each front side clamping part and each rear side clamping part whose inner surfaces facing each other in the left and right directions are formed in a concave curved shape. At this time, each front side clamping part and each rear side clamping part are given spring properties by notches, which not only facilitates automatic insertion, but also allows for adjustment within the space between these clamping parts. When a resistive electrode is attached, there is a large contact area between the electrode and the resistor, so that the electrode can be strongly held.
It becomes possible to improve the positioning accuracy of the adjustment resistor.

【0015】

Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 6. In the embodiment, the same components as those of the prior art shown in FIG.

[0016] In the figure, reference numerals 10 and 10 indicate Melf resistances as adjustment resistors formed in a cylindrical shape, and each Melf resistance 10 has a length of 2 to 6 mm, a diameter of about 2 mm, and a predetermined resistance. electrodes 10 are formed on both ends in the axial direction over the entire circumference.
A, 10A are provided.

[0017] Reference numerals 11 and 11 indicate terminals for mounting each Melf resistor 10 on the printed circuit board 1, and each terminal 11 is a conductive metal plate,
For example, after a plate material such as copper is previously formed into a predetermined shape by means such as a press, arm parts 13 and 14, which will be described later, are bent rearward into a substantially U-shape as shown in FIG. It is formed by bending. The terminals 11 are spaced apart from each other by a predetermined dimension in the axial direction of the Melf resistor 10, that is, by a dimension corresponding to the spacing between the electrodes 10A, and are connected to the printed circuit board.
The two MELF resistors 10, 10 are connected in parallel.

[0018] In this case, the printed circuit board 1 is provided with two mounting portions 2 for each terminal 11, so that each terminal 11 can be stably mounted on the printed circuit board 1.

[0019] Here, as shown in FIGS. 2 to 5, each terminal 11 has a flat support part 12 that constitutes the main body of the terminal 11, and the support part 12 in order to support the two Melf resistors 10, 10. Left from part 12,
The left and right arms 13, 13 are spaced apart in the right direction and extend upward, the central arm 14 is located between the arms 13, and the support part 12 has a predetermined dimension in the left and right directions from the lower end side. It is roughly composed of a pair of terminal pins 15, 15 that protrude downward at a distance of about 5 mm (for example), are inserted into each mounting part 2, and are fixed by soldering, etc., and each arm part 13, 14 is shown in FIG. By being bent backwards into a substantially U-shape as shown in
Each front side holding part 13A, 14A, each connection part 1 which will be described later
3B, 14B and each rear side clamping part 13C, 14C
etc., are now integrated.

[0020] That is, each of the left and right arm parts 13 has a front clamping part 13A and a substantially rectangular connecting part extending rearward from the upper end of the front clamping part 13A with a predetermined length of, for example, about 1 mm. 13B and the connecting portion 13B
It extends downward from the tip of the front side clamping part 13A so that the lower end side thereof becomes a free end, and is generally composed of a rear side clamping part 13C that is spaced apart from the front side clamping part 13A by a predetermined distance rearward and facing the front side clamping part 13A at the front and rear. Rear side holding part 1
3C and the front holding portion 13A have inner surfaces in the left and right directions formed into a concave curved shape with a circular arc corresponding to the outer peripheral surface of the electrode 10A.

[0021] The central arm 14 also has front clamps on both the left and right sides that oppose the front clamp part 13A and the rear clamp part 13C of each arm part 13 in the left and right directions and form a pair with these. portions 14A, 14A and rear side clamping portions 14C, 14C are formed, and each clamping portion 14
The upper ends of A and 14C are connected to the connecting portion 13 in the front and rear directions.
They are integrally connected by a connecting portion 14B extending to have the same length as B. Each front side clamping part 14A and each rear side clamping part 14C are formed in a concave curved shape like each clamping part 13A, 13C of the arm part 13, and each Merck resistor 10 is formed between each of these clamping parts 13A, 13C. In order to firmly hold the electrode 10A,
The distance between the holding parts 13A and 13C in the left and right directions is smaller than the diameter of each electrode 10A at both the upper and lower end sides.

[0022] In addition, each rear side clamping part 14C of the arm part 14
The lower end side is a free end, and as shown in FIG. 4, the distance between the arm part 13 and the rear side holding part 13C is smaller than the diameter of each electrode 10A due to left and right separation parts 16, 16. Each arm portion 13, 14 has tapered guide portions 13D, 13 located at both ends of the connecting portions 13B, 14B, and tapered guide portions 13D, 13 at the upper ends of the inner surfaces of the respective clamping portions 13A, 13C, 14A, 14C.
D, . . . , 14D, 14D, .
C, 14A, and 14C smoothly.

[0023] Furthermore, 17, 17 are each front side clamping part 1
Left and right notches are shown that are formed in a substantially U-shape in the support part 12 by cutting downward between 3A and 14A, and each of the notches 17 is cut out downwardly between the left and right notches 17 through the central arm part 14. Formed symmetrically, left and right arm portions 13,
13 is spaced apart from the central arm portion 14 in the left and right directions. The notches 17 provide spring properties to the front clamping parts 13A, 14A and the rear clamping parts 13C, 14C, and allow each electrode 10A to be smoothly and automatically inserted between them as described later. After that, each holding part 13A, 13
Each electrode 10A is strongly sandwiched by C, 14A, and 14C.

[0024] The terminal 11 according to this embodiment has the above-mentioned configuration, and is adapted to be attached to the printed circuit board 1 as a set of two terminals as shown in FIG. Each Melf resistor 10 has each front side holding part 13A, 14A of each terminal 11,
The electrodes 10A are inserted between the rear side clamping parts 13C and 14C in the direction of the arrow in FIG. 1 using an automatic insertion machine (not shown), etc. 14A and between each of the holding parts 13C and 14C so as to be wrapped from the left and right directions,
It is held in a stable state with a relatively large contact area on the front, back, left, and right sides. At this time, each guide portion 13D, which is formed in a tapered shape, is provided at the upper end portion of each of these holding portions 13A, 13C, 14A, and 14C.
14D is integrally formed, the guide parts 13D and 14D guide the electrode 10A of each MELF resistor 10 between the respective clamping parts 13A and 14A, and the respective clamping parts 1
You can smoothly guide between 3C and 14C. Also,
Since each approximately U-shaped notch 17 is integrally formed on the lower end side of each front side holding part 13A, 14A,
Relatively large springiness can be imparted to each clamping part 13A, 13C, 14A, 14C, and the electrode 10A can be attached to each clamping part 13A, 13C, 14A, 14C.
A strong clamping force can be applied to the

[0025] Then, each electrode 10 of the Melf resistor 10
Between each clamping part 13A and 14A, each clamping part 13
After mounting between C and 14C, each electrode 10A is soldered to these clamping parts 13A, 13C, 14A, 14C, etc. using an automatic soldering machine (not shown). Melf resistor 10 is mounted on printed circuit board 1.

[0026] According to this embodiment, in order to connect the two Melf resistors 10 in parallel, the left and right arm parts 13, 13 and the central arm part 14 are mounted on the support part 12.
are formed by extending upward, and each of the arm portions 13,1
By bending 4 rearward into a substantially U-shape, each front side clamping part 13A, 1 has a concave curved surface corresponding to the outer peripheral surface of the electrode 10A.
4A, each rear side clamping part 13C, 14C is integrally formed, and each tapered guide part 1 is formed on the upper end side of these.
3D and 14D, and each front side holding part 13
A, 14A are provided with respective notches 17 extending downward in a U-shape, and each clamping portion 13A, 13C, 14
Since A and 14C are configured to have spring properties,
Between these holding parts 13A, 14A, 13C, 1
The electrodes 10A of each MELF resistor 10 can be smoothly and automatically inserted between the 4Cs through the respective guide parts 13D and 14D, and the workability during automatic insertion can be improved, and the clamping force for each electrode 10A can be effectively increased. be able to.

[0027] Then, each electrode 10A is placed between each front side clamping part 13A, 14A and each rear side clamping part 13C, 14C.
Since each electrode 10A is sandwiched between the two electrodes, when each electrode 10A is completely attached, each electrode 10A can be stably sandwiched, and the contact area can be effectively enlarged. In addition, each cutout portion 17 allows the front side clamping portion 1
3A, 14A, etc. can be applied to each electrode 10A from the left and right directions, the positioning accuracy of each MELF resistor 10 can be improved, soldering etc. can be automated, and it is suitable for automobiles etc. Even if installed, Melf resistance 10 due to vibration during driving
It is possible to reliably prevent it from falling off.

[0028] Furthermore, the terminal 11 can be miniaturized similarly to the MELF resistor 10, and the implementation density of the printed circuit board 1 can be dramatically increased. Furthermore, the overall height dimension can be made as small as possible, and various effects can be achieved, such as making it possible to reduce the installation space for a control panel or the like to which the printed circuit board 1 is attached.

[0029] In the above embodiment, the Melf resistor 1
0 is connected in parallel, but instead of this, as in the modification shown in FIG.
Right front clamping parts 23A, 23A, connecting part, left and right rear clamping parts (not shown), and each guide part 23
The left and right arm parts 23, 23 where D etc. were formed,
Notch 25 between each terminal pin 24 and each arm 23
etc., and one Melf resistor 10 or the like may be attached, or a structure may be adopted in which three or more Melf resistors 10 or the like are attached.

[0030] Furthermore, in the embodiment, each of the front side clamping parts 13A, 14A and each of the rear side clamping parts 13C, 14
Tapered guide portions 13D at the upper ends of C,
Although it has been described that the guide portions 14D are formed, the present invention is not limited to this, and for example, guide portions may be formed on the inner surfaces facing each other in the left and right directions of the connecting portions 13B and 14B.

【0031】

Effects of the Invention As detailed above, according to the present invention, a terminal is formed by a conductive metal plate, and the terminal is separated from the support part to the left and right and extends upward. a front side clamping part connected to the upper end of each front side clamping part via each connecting part,
Left and right rear side gripping parts facing each front side gripping part at the front and rear, each guide part formed at the upper end of each of these gripping parts, and support by cutting downward between each front side gripping part. Each front clamping part and each rear clamping part have inner surfaces facing each other in the left and right directions facing the outer circumferential surface of the electrode of the adjustment resistor. Since it is formed in a correspondingly concave curved shape, the adjustable resistance can be automatically inserted smoothly from above between each front side clamping part and each rear side clamping part via each guide part, improving work efficiency during automatic insertion. In addition, when the electrode of the adjustment resistor is attached between these clamping parts, the electrode can be held in a stable state with a strong clamping force, and the contact area with the electrode is increased, increasing the positioning accuracy of the adjustment resistor. can be improved and soldering can be automated. In addition, the mounting density of the printed circuit board can be greatly improved, and when installed in an automobile or the like, it is possible to reliably prevent the adjustment resistor from falling off due to vibrations during driving, and various other effects are achieved.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing a state in which a terminal according to an embodiment of the present invention is mounted on a printed circuit board.

FIG. 2 is a front view of the terminal shown in FIG. 1.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a back view of FIG. 2.

5 is a cross-sectional view in the direction of the arrow in FIG. 2. FIG.

FIG. 6 is a front view showing a terminal according to a modified example.

FIG. 7 is a perspective view showing how a conventional adjustment resistor is attached to a terminal on a printed circuit board.

[Explanation of symbols] 1...Printed circuit board, 2...Mounting part, 10...Melf resistance (adjustment resistance), 10A...electrode, 11, 21...terminal, 12, 22...support part, 13, 14, 23...arm part, 13A, 14A,
23A...front holding part, 13B, 14B...connecting part,
13C, 14C...rear side holding part, 13D, 14D,
23D...Guide portion, 15, 24...Terminal pin, 1
7, 25... Notch.

Claims (1)

[Claims] [Claim 1] A terminal for an adjustment resistor formed of a conductive metal plate for mounting on a printed circuit board an adjustment resistor formed in a cylindrical shape and provided with electrodes on the outer periphery of both ends. , a support part on a flat plate, and an inner surface extending upward apart from the support part to the left and right, and facing each other in the left and right directions, and formed in a concave curved shape corresponding to the outer circumferential surface of the electrode of the adjustment resistor. at least a pair of left and right front side clamping parts,
The inner surface facing each front clamping part at a predetermined distance rearward from the front clamping part and facing the front clamping part in the left and right directions is formed in a concave curved shape corresponding to the outer peripheral surface of the electrode of the adjustment resistor. Left and right rear clamping parts, and left and right connections that extend in the front and rear directions and are spaced apart in the left and right directions to connect the upper ends of the rear clamping parts to the upper ends of the front clamping parts. and located at both ends in the front and rear directions of each of the connecting parts, and formed at the upper end of the inner surface of the front clamping part and the upper end of the inner surface of the rear clamping part, between each of the front clamping parts, A guide portion that guides the electrode between each of the rear side clamping portions, a downward cutout between each of the front side clamping portions, and a spring formed on the support portion; A terminal for an adjustment resistor, the terminal comprising: a notch for imparting properties; and a terminal pin that protrudes downward from the lower end of the support and is attached to the printed circuit board.