JPH04177801A - Electric resistor for vertical type mounting and mounting method therefor - Google Patents

Abstract

PURPOSE:To make it possible to insert an electric resistor main body in an electric wiring board by a general-purpose automatic as well as to contrive the improvement of the heat dissipation effect of an electric resistor by a method wherein a heat dissipation element is provided on the lower end of the main body to lead out a lead wire and a lead wire is led out downward through the upper end of the main body. CONSTITUTION:A flat plate-shaped heat dissipation element 4 is mounted on a terminal part 2 under the lower end of an electric resistor main body 1 integrally with the terminal part 2 and a narrow and slim lead wire 7 is formed on the central part of the lower end of the element 4. On the other hand, a lead wire 8 is lead out through a terminal part 3 on the upper end of the main body 1. A part 8c of the wire 8 and the wire 7 are fixed holding a pair of tapes 12 between them, the part 8c of the wire 8 and the wire 7 are cut off by an automatic inserter along each one side edge of the tapes 12 and the main body 1 is vertically mounted on an electric wiring board 10. Thereby, the electric resistor 1 is automatically inserted in the board 10 by the general-purpose automatic inserter and an adverse effect to the board 10 and components adjacent to the board 10 due to heat, which is generated from the resistor 1, is eliminated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is suitable for vertical mounting when applied to nonflammable metal oxide film resistors used in electric circuits, especially electric circuits that consume a lot of power. This invention relates to an electrical resistor and its mounting method.

[Summary of the invention]

In the present invention, a heat dissipation element is provided at the terminal at the lower end of the electrical resistor body, a lead wire is taken out, and the lead wire is guided downward from the upper end of the electrical resistor body at a predetermined distance from the electrical resistor body. This is a vertically mounted electrical resistor that has a structure that allows the electrical resistor body to be inserted into an electrical wiring board using a general-purpose automatic insertion machine, and also takes into consideration heat dissipation and tilt prevention.

[Conventional technology]

For example, in a conventional non-flammable metal oxide film resistor, as shown in FIG. The ends of both the lead wires 101a and 101b are fixed with tapes 102a and 102b, and the tapes 102
A large number of electrical resistors are arranged in the longitudinal direction of a and 102b. This is a so-called axial taped electrical resistor, and it was developed and commercially available for automatic insertion into electrical wiring boards using an automatic insertion machine.

Such axially taped electrical resistors are manufactured by the Electronics Industries Association of Japan (hereinafter referred to as EIAJ).

), and there are two types in which the distance Ly between the tape 102a and the tape 102b is 52 mm and 73 mm, and there are also electric resistors with a power capacity of 1 watt, 2 watts, and 3 watts. When axially mounting the electrical wiring board 103 as shown in FIG. 7A, the so-called insertion pitch Lz for inserting the lead wires 101a and 101b of the electrical resistor into the holes of the electrical wiring board is 12.5 mm, respectively. , 15mm and 20mm.

As mentioned above, these electrical resistors are designed to be compatible with automatic insertion, but in reality, the tape spacing L
A special automatic insertion machine tailored to y and pitch Lz is required.
Introducing such individual dedicated automatic insertion machines is said to be extremely difficult in terms of cost as well as quality control of electrical wiring boards on which various electrical components are mounted, and their productivity.

Therefore, at present, instead of using the axially taped electrical resistor shown in FIG. 6, a pre-homed cut-form product is purchased and manually inserted and mounted onto the electrical wiring board 103. .

Furthermore, the crushing kinks 104a and 104b may not be provided on both lead wires 101a and 101b, and when axial mounting is performed manually, the
As shown in the figure, the distance Hx between the surface temperature of the electrical resistor body and the electrical wiring board varies, and in the worst case, the electrical resistor main body 100 comes into contact with the surface of the electrical wiring board 103, causing the electrical resistor main body 100 to emit light. There is a risk of burning the surface due to the heat. Furthermore, even if a dipping kink is attached, when radially mounting as shown in FIG. 7B, the crushed kink 104b attached to one lead wire, for example, the lead wire 101b, will be cut. , the distance Hy between one end of the electrical resistor body and the surface of the electrical wiring board varies, and the above-mentioned danger still exists, and even if the distance Hy can be maintained at a predetermined interval, the length of the lead wire 101b Since the heat is not sufficiently cooled, there is a risk that the electric wiring board and circuits around it may be burned out through the lead wire 101b and the solder 105 without being sufficiently cooled.

Furthermore, in the conventional axial mounting method and radial mounting method as shown in FIG. 7A and FIG. 7B, since the electrical resistor body 100 is supported at two points, it may be installed at an angle, and the adjacent approaching or touching parts;
This caused problems in terms of safety, as it scorched neighboring parts and had an adverse thermal effect.

[Problem to be solved by the invention]

Therefore, the present invention aims to eliminate the above-mentioned drawbacks and develop an electrical resistor that can be automatically inserted into an electrical wiring board using a general-purpose automatic insertion machine (for example, Panasert RHU manufactured by Matsushita Electric Industrial ■). That is. Furthermore, measures are being taken to prevent the heat generated by the electrical resistor from having an adverse effect on the electrical wiring board and adjacent components, that is, from the standpoint of safety.

[Means to solve the problem]

Therefore, in the present invention, a heat dissipation element is provided at the terminal at the lower end of the electrical resistor body, a lead wire is taken out, and the lead wire is inserted downward from the upper end of the electrical resistor body at a predetermined distance from the electrical resistor body. The electrical resistor for vertical mounting was derived, and the heat dissipation element had a function of preventing the main body of the electrical resistor from tilting.

[For production]

Therefore, the electrical resistor of the present invention can be automatically inserted into an electrical wiring board using a general-purpose automatic insertion machine, and there is no need for special inspections that require many man-hours for safety measures.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the electrical resistor for vertical mounting (hereinafter simply referred to as an electrical resistor) of the present invention and its mounting method will be explained using the drawings.

FIG. 1 shows a first embodiment of the electrical resistor of the present invention, and FIG.
is a front view, B is a rear view, and C is a side view.

First, its configuration will be explained. 1 is an electrical resistor main body, and a flat heat dissipating element 4 is integrally attached to a terminal portion 2 at the lower end of the electrical resistor main body. The flat plate constituting the heat dissipation element 4 is preferably made of a metal with good conductivity, heat conduction, and heat dissipation properties, such as copper. The shape of the plate and its thickness are
Make it as thin as possible in terms of strength and heat dissipation. Further, when the electrical resistor main body 1 is cylindrical, its width should be such that it does not protrude beyond its diameter. With such dimensions, when the electrical resistor is mounted on the electrical wiring board 10 as shown in FIG. 5, it does not take up much space. Furthermore, if the width is too narrow, it will tend to tilt when the electrical resistor is mounted on the electrical wiring board 10, so the dimensions are taken so as not to make the width too narrow. Heat conduction prevention holes 5 were provided in the flat plate constituting this heat dissipation element 4. When such a heat conduction prevention hole 5 is provided, heat dissipation is promoted by the heat conduction prevention hole 5. Although such a heat conduction prevention hole 5 may be provided at the heat dissipation element 4, the present inventors have found that when the heat conduction prevention hole 5 is provided above the heat dissipation element 4, that is, on the side of the electrical resistor main body l. Experiments have confirmed that it is effective. This is thought to be because by providing the heat conduction preventing hole 5 near the heat generation source, the generated heat can be immediately dissipated through the heat conduction preventing hole 5. Therefore,
When the electrical resistor is mounted on the electrical wiring board 10 as shown in FIG. 5, the temperature at the lower end of the heat dissipating element 4 is relatively low, so that the electrical wiring board 10 can be prevented from being adversely affected by heat.

Furthermore, the heat dissipation element 4 also has the role of a lead wire, and at the center of the lower end of the flat plate that is the heat dissipation element 4, a narrow and elongated lead wire 7 is formed as shown in FIG. do. Note that the heat conduction prevention hole 5 and the lead wire 7 can be integrally formed when punching out a flat plate. The width of the lead wire 7 is thin as described above, but it is wider than the thickness of the flat plate. As shown in A and FIG. 1C, the lead wire 7 is twisted by 90° at the boundary between the flat plate 4 and the lead wire 7.

On the other hand, a lead wire 8 is led out from the terminal portion 3 at the upper end of the electrical resistor main body l. The lead wire 8 includes a portion 8a extending perpendicularly to the long axis of the electrical resistor main body l, and a portion 8a extending at a predetermined distance from the electrical resistor main body l and parallel to the long axis thereof. It consists of a portion 8b extending downward, and a portion 8c that is inserted into the electrical wiring board 1O and held and fixed with tape when taped. Lead wire 8
The lead wire 8 is bent and led out so that the flat plate is at a right angle or at an angle close to a right angle to the line connecting the portion 8b and the center line of the flat plate.

Further, a crushing kink 9 is provided between the portion 8b and the portion 8C of the lead wire 8. The lower end of this crushed kink 9 is aligned with the same height as the lower end of the heat dissipation element 4. Further, the flat surface of the crushing kink 9 is formed to be perpendicular to the flat surface of the heat radiating element 4.

FIG. 2 shows a modification of the heat dissipation element 4 of this embodiment.

That is, a notch 11 is provided at the lower end of the flat heat dissipating element 4 that contacts the electrical wiring board 10, so that the heat dissipating element 4 or the electrical wiring board 1 is provided with a cutout 11.
The surface corresponding to 0 is made small to reduce thermal stress on the electrical wiring board 10 due to heat conducted through the heat dissipation element 4. In the illustrated case, two notches 11 are provided, but it goes without saying that a configuration may be adopted in which one, for example, rectangular notch 11 is provided in the center of the flat plate, leaving both ends of the lower end of the flat plate. .

Next, an electric resistor according to a third embodiment of the present invention will be described using FIG. Figure A is a front view, Figure B is a rear view, and Figure C is a side view. The same parts as in FIG. 1 are given the same reference numerals.

The electrical resistor of this third embodiment differs from the first embodiment in that the lead wire I is connected to the terminal 2 at the lower end of the electrical resistor main body l.
A heat dissipating element 4 having a cylindrical shape is attached to the terminal 2 through the lead wire 7, which is electrically connected to the terminal 2. This cylinder may be constructed by extending the terminal. A heat conduction prevention hole 5 was provided on the cylindrical electrical resistor main body l side.

In the case of this embodiment, four heat conduction prevention holes 5 were provided at equal intervals. This number can be increased or decreased depending on the efficiency of heat dissipation and the mechanical strength of the cylinder. The other configurations of this embodiment are the same as those of the first embodiment, and will therefore be omitted.

Next, a structure in which the electrical resistor of the first embodiment of the present invention is taped will be described. FIG. 5 is a front view thereof.

Since the electrical resistor of the present invention has the above-described structure, it can be automatically inserted into an electrical wiring board using a radial mounting method using a general-purpose automatic insertion machine. be able to. Their dimensions are described below using the symbols shown in FIG.

La: Maximum diameter 18mmΦ Lb: Maximum 26.0mm Lc: Maximum 46.0mm Ld: 7.5mm Le: 15. Omm Therefore, the electrical resistor of the present invention can satisfy these dimensions.

The lead wires 8C and 7 are arranged in parallel and protrude from one side edge 13 of the tape 12, leaving at least a length that is inserted into the electrical wiring board 10, bent and soldered. Then, it is fixed by sandwiching it with a pair of tapes 12. As mentioned above, the lead wire 7 has a narrow width, but it is connected to the flat plate 4.
Since the width is wider than the thickness of the lead wire 7, the lead wire 7 is twisted 90 degrees at the border between the flat plate 4 and the lead wire 7, and the wide side is along the tape surface, so when taping The electrical resistor of the present invention can be stably fixed. 14 is a hole for feed pitch, and Le
A large number of them are provided at intervals of .

Lead wire 8c and lead wire 7 are two feed pitch holes 1
A large number of electrical resistors are arranged and fixed so as to be located in the center of 4.

When the electrical resistor of the present invention is automatically inserted into the electrical wiring board 10 using a general-purpose automatic insertion machine, the lead wires 8c and 7 are cut along one side edge 13 of the tape 12 by the automatic insertion machine. , is radially mounted on the electrical wiring board 10 as shown in FIG. In this case, the heat dissipating element 4 and the crushing kink 9 should be sufficiently inserted into the electrical wiring board 10 so that the lower ends of the crushing kink 9 do not rise above the surface of the electrical wiring board 100, and the lower end of the heat dissipating element 4 should be placed on the surface of the electrical wiring board lO. Fix it so that it is in contact with the

As mentioned above, since the plane of the crushing kink 9 is configured to be perpendicular to the plane of the flat plate of the heat dissipation element 4,
It is difficult to tilt in the direction of the arrow X, and since the flat plate is oriented at right angles or at an angle close to the line connecting the center line of the flat plate that is the heat dissipation element 4 and the lead wire 8b, the electrical resistor is tilted in the direction of the arrow Y. It's getting harder to lean towards. That is, since the flat plate is in contact with the electrical wiring board 10 along its width,
A force of 200g, which is above the safety standards, is applied to the electrical resistor body.
According to the structure and radial mounting method of the electrical resistor of the present invention, the electrical resistor will not tilt in the direction of the arrow Y even if the electrical resistor is added to the angle .

〔Effect of the invention〕

As described above, the vertically mounted electrical resistor and its mounting method of the present invention can satisfy all EIAJ taping standards for radial mounted electrical resistors, and therefore can be used with a general-purpose automatic insertion machine. Electrical resistors such as watt, 2 watt, 3 watt, etc. can be automatically inserted at the same pitch. Furthermore, since it is a radial mount, it is possible to increase the mounting density when designing an electrical wiring board. And compared to a dedicated special automatic insertion machine, the takt time for automatic insertion can be halved. Furthermore, since the heat dissipation element is provided at the lower end of the electrical resistor main body, it is possible to prevent the electrical wiring board from being adversely affected by heat. Furthermore, since the heat dissipation element is provided with a heat conduction prevention hole and a notch at the lower end of the heat dissipation element 4, a -required heat dissipation effect can be obtained. Furthermore, since this heat dissipation element is self-sustaining and independent in relation to the electrical resistor lead wire and the heat dissipation element, it does not tilt even when radially mounted on an electrical wiring board, making it safe. Safety can also be ensured from the standpoint of standards.

Considering these various points, the unit price of the electrical resistor itself according to the present invention will be high, or the number of man-hours in the manufacturing process will be significantly reduced, and the above-mentioned safety can be ensured. Electrical circuit boards mounted with electrical resistors can lower overall costs and prevent dangerous burnouts. Therefore, an electrical device equipped with such an electrical wiring board can have many excellent advantages, such as being able to ensure quality, reliability, safety, etc. at low cost.

[Brief explanation of drawings]

FIG. 1 shows a vertically mounted electric resistor according to a first embodiment of the present invention, in which FIG. 1A is a front view, FIG. 1B is a rear view, and FIG. 1C is a side view. FIG. 2 is a front view for explaining a modification of the vertical mount electrical resistor of the first embodiment. Figure 3 shows a vertically mounted electric resistor according to a second embodiment of the present invention, in which Figure A is a front view, Figure B is a rear view, and Figure C is a rear view.
shows a side view. FIG. 4 shows a front view of the electrical resistor for vertical mounting according to the first embodiment of the present invention, which is taped. FIG. 5 is a perspective view for explaining the mounting method of the vertically mounted electrical resistor of the present invention. FIG. 6 is an explanatory plan view of a conventional axially taped electrical resistor. FIG. 7 is an explanatory diagram of a conventional method for mounting an electrical resistor on an electrical wiring board, and FIG. 7A is a side view of an axially mounted electrical resistor;
Figure B is a side view of a radially mounted electrical resistor. (Explanation of symbols) 1.100... Electric resistor body 2.3... Terminal portion 4... Heat dissipation element 5... Heat conduction prevention hole 7.8. 101a, 101b-... Lead wire 9 .104
a, 104b--Dipping kink 10.103...Electric wiring board 11...Notch 12.102a, 102b--Tape 14...Hole for feed pitch 105...Solder ALE side view B Rear view C side view Figure 1 Electrical resistor for vertical mount according to the first embodiment of the present invention Figure 2 Electrical resistor for the vertical mount according to the first embodiment of the present invention
Figure 3: A front view of the r-teme explaining the deformation of the resistor Figure 4: The electric parishioner nine electric parishioners for the fiber-shaped maulet of the second prize example of Honkomei Figure 4: Vertical mount of the first example of Honkomei A front view of the electrical resistor and the taping of the electric resistor.A perspective view of the mounting method and explanation of the mounting method.16. Side view B of electrical resistor
Radial mount and harness (side view of electric twist I)
Figure 1 An explanatory diagram of how to mount the electrical wiring board of Hikira's Kamekiki resistor

Claims (9)

[Claims] 1. A heat dissipation element is provided at the terminal at the lower end of the electrical resistor body, a lead wire is provided, and the lead wire is guided downward from the upper end of the electrical resistor body at a predetermined distance from the electrical resistor body. Electrical resistor for vertical mounting. 2. 2. The electrical resistor for vertical mounting according to claim 1, wherein the heat dissipation element has a function of preventing the electrical resistor main body from tilting outside a predetermined range. 3. 2. The electric resistor for vertical mounting according to claim 1, wherein the heat dissipation element is formed of a flat plate. 4. 2. The electrical resistor for vertical mounting according to claim 1, wherein the heat dissipation element is formed of a cylinder. 5. 2. The electrical resistor for vertical mounting according to claim 1, wherein a heat conduction prevention hole is provided on the electrical resistor main body side of the heat dissipation element. 6. Claims characterized in that a crushed kink is formed in the lead wire led out from the upper end of the electrical resistor main body, and the lower end of the crushed kink is aligned at the same height as the lower end of the heat dissipation element. The electrical resistor for vertical mounting according to item 1. 7. 2. The electrical resistor for vertical mounting according to claim 1, wherein the lower end of the heat dissipation element is comprised of a plurality of protrusions. 8. The electric resistor for vertical mounting according to claim 6 is mounted on a long tape at predetermined intervals in the length direction of the tape and along one side edge of the tape. Particularly, automatic insertion into an electric wiring board, characterized in that a plurality of heat dissipating elements and the lower ends of the crushing kinks are arranged side by side with a predetermined distance from one side edge and fixed to the tape. Electrical resistor for vertical mounting suitable for. 9. When mounting the vertical mounting electric resistor according to claim 3 on an electric wiring board, a line connecting the center line of the flat plate and the lead wire led out downward from the upper end of the electric resistor main body. On the other hand, a method for mounting an electric resistor for vertical mounting, characterized in that the flat plate is mounted at a right angle or at an angle close to it, and the lower end of the flat plate is in contact with the surface of the electric wiring board.