JP3108748B2 - Method of manufacturing plate resistance element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plate resistance element.
It relates to a manufacturing method .

[0002]

2. Description of the Related Art Conventionally, a plate resistance element 85 is used as, for example, a fixed resistor as shown in FIG. That is, in this fixed resistor, a plate resistance element 85 is housed in a ceramic case 80 with its terminals 89, 89 protruding outside, and a filler 90 is placed in the ceramic case 80.
Is filled and solidified.

Here, the plate resistance element 85 is formed by forming a resistance plate 87 made of a meandering wire by punching a flat resistance plate material by a press die, and welding terminals 89, 89 to both ends thereof. ing.
That is, by forming the resistance plate 87 into a meandering wire shape, a predetermined resistance value is obtained between the two terminals 89. This type of plate resistance element is generally used for low resistance and has a resistance value of, for example, 0.22Ω.

The production of the plate resistance element 85 is performed by continuously pressing the resistance plate 87 with a press die on a strip-shaped resistance plate material.
Stamping out the part which becomes
The terminal 89 is continuously welded to both ends of the portion to be formed, and then each resistance plate 87 is cut from the resistance plate material.

[0005]

However, the resistance plate 8
7 and the width of the gap between the wires is 0.3 to
Since the material to be pressed is as fine as about 0.5 mm and the material to be pressed is hard, not only does the cost of the press die for pressing the die increase, but also the polishing of the die is required periodically.

In order to increase the resistance value, it is necessary to further reduce the width of the wire or to reduce the thickness of the material to be pressed. The width of the gap between the wires is 0.3-
The limit is about 0.5 mm. If the thickness of the material to be pressed is reduced, the press cannot be performed well. In addition, if the width between the wires cannot be reduced, the number of parts cut and discarded by the press increases, and it is not possible to reduce the material cost.

[0007] Also, since the mold is expensive, it is not possible to prepare so many types. When changing the resistance value, it is necessary to change the thickness and the material of the material. Fine adjustment of the resistance value was difficult because of the manufacture. Further, the variation in the thickness of the material directly results in the variation in the resistance value.

Further, the terminals 89 are obstructed during the pressing, so that the terminals 89 are attached after the pressing process. However, since the resistance plate 87 after the pressing is a meandering wire, it is extremely easily bent. And welding of the terminal 89 was difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object the purpose of performing fine processing with good precision and ease and at low cost. It is an object of the present invention to provide a method of manufacturing a plate resistance element which can be easily removed and can be finely adjusted easily and reliably.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems , a method of manufacturing a plate resistance element according to the present invention uses a strip-shaped element.
Terminal mounting process for sequentially mounting terminals on the resistance plate material
And measuring the resistance value between the pair of terminals while measuring the resistance value between the pair of terminals.
The resistive plate material located between them is alternately recorded from the upper and lower sides.
Cut by water or water jet cut.
And the measured resistance value becomes a predetermined resistance value.
Laser cut or water jet
And after the cutting process is completed
Cut the resistor plate material of each part to become the plate resistance element
And a cutting step.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a fixed resistor 1 using a plate resistor 10 according to one embodiment of the present invention.
FIG. 3 is an exploded perspective view of FIG. As shown in the figure, the fixed resistor 1 includes a plate resistance element 10 in a ceramic case 80.
Are stored in a state where the terminals 20 and 20 are projected outside,
A filler material 90 is filled and solidified in the ceramic case 80.

The ceramic case 80 is a box having an open upper surface, and is formed by firing ceramic. As the filler 90, for example, a silicon-based thermosetting heat-resistant resin is used.

On the other hand, the plate resistance element 10 is configured by attaching terminals 20, 20 to both ends of a flat resistance plate 13 having a cut groove 11 formed by laser cutting.

FIG. 2 is a view showing a manufacturing process of the plate resistance element 10. That is, as shown in FIG. 3A, first, the resistor plate material 60 formed in a belt shape is sequentially pulled out and the terminals 20 are welded at predetermined intervals. The resistance plate material 60 is made of a desired resistance material, for example, an iron-chromium alloy, a nichrome material, or the like.

Next, as shown in FIG.
In the state where the needles (probes) 65, 65 for measuring the resistance value are in contact with 0, 20, a plurality of cut grooves 11 are formed on the surface of the resistance plate material 60 between the pair of terminals 20, 20 in the vertical direction. Is cut by laser. The cut grooves 11 are alternately provided with those cut from the upper side and those cut from the lower side. These cut grooves 11 connect the pair of terminals 20 with a meandering wire. Various lasers such as a YAG laser and a carbon dioxide laser can be used as the laser.

The width of the laser cut is as narrow as about 0.03 mm. Therefore, one cut groove 11 is formed by moving the laser cut line in a U-shape.
When the width of the cut groove 11 may be about 0.03 mm, one cut groove 11 may be formed by only one linear laser cut line.

As described above, the width of the cut groove 11 is 0.03
mm can be set freely, and the width of the wire remaining after cutting can be similarly reduced. Therefore, not only can the width of the entire plate resistance element 10 be reduced accordingly, but also the width of the settable resistance value can be reduced by the conventional press working. Can be significantly larger than the plate resistance element 85. In addition, the amount of material cut and discarded is reduced, and material cost can be reduced.

In this embodiment, since the resistance value is measured while performing laser cutting, the last cut groove 11a is cut.
Stops the cut when the measured resistance value reaches the resistance value to be set (therefore, the length of the cut groove 11a to be cut last differs depending on each plate resistance element 10). This provides an accurate resistance value.

After the cutting step is completed, if the resistor plate material 60 is cut along a cutting line DD shown in FIG. 1B, the plate resistor elements 10 shown in FIG. 1 are sequentially completed. .

The plate resistance element 10 is automatically inserted into the ceramic case 80 in sequence, and the filler 90 is filled and solidified, whereby fixed resistors are sequentially manufactured.

In the above embodiment, the cut groove 11 is formed by cutting the resistance plate material 60 by laser cutting, but the cut groove 11 may be formed by cutting with a water jet instead of laser cutting. The water jet cutting is for polishing the metal plate material 60 by spraying water mixed with an abrasive at a high pressure and a high speed, and replacing the laser cutting process with a water jet cutting process. The same operation and effect as described above can be obtained. The cut width is, for example, about 0.8 mm.
In the case of water jet cutting, the resistance between the terminals 20 and 20 cannot be measured while cutting due to the conductivity of the water. Therefore, the last cut groove 11 is slightly cut, and the water is blown off with air or the like to remove the resistance. It is preferable to measure the resistance value and cut it a little to measure the resistance value to obtain a desired resistance value.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and for example, the following various modifications are possible. It goes without saying that the shape of the cut groove 11 can be variously deformed as required.

It goes without saying that various materials can be used for the resistance plate.

[0024]

[0025]

[0026]

[0027]

As described in detail above, the present invention has the following excellent effects. Since the cut grooves are formed by laser cutting or water jet cutting, fine processing can be performed accurately, easily, and at low cost.

Since fine processing can be performed, the resistance value can be easily increased in spite of being a plate resistance element, and the change width of the resistance value can be increased from a small resistance value to a large resistance value. In addition, the size of the resistor plate for obtaining the same resistance value can be made smaller than before, and the width of the cut groove can be easily reduced, so that there are few portions that are cut and discarded, and material costs can be reduced.

Since cutting is performed while measuring the resistance value,
Fine adjustment of the resistance value can be performed easily and reliably. Even if the thickness of the material or the mounting position of the terminal varies, the resistance value does not vary.

Various types of cut groove shapes can be easily formed simply by changing the cut shape by laser or water jet, so that various types of dies are prepared as in the prior art, or various types of resistance plate materials are used. -It is not necessary to prepare a thing with a thickness, the manufacturing cost is reduced, and a mold and maintenance such as mold polishing are not required.

Even if the thickness of the material to be pressed becomes thin, a cut groove can be easily formed in the laser cut or water jet cut.

Since the cut grooves can be formed in a state where the terminals are attached to the resistor plate material in advance, the terminals can be attached to the resistive plate material which does not easily bend before the cut grooves are formed, and the attachment can be performed easily and accurately. You.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fixed resistor 1 using a plate resistance element 10 according to one embodiment of the present invention.

FIG. 2 is a view showing a manufacturing process of the plate resistance element 10;

FIG. 3 is an exploded perspective view of a conventional fixed resistor using a plate resistance element 85.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Plate resistance element 11, 11a Cut groove 13 Resistance plate 20 Terminal 60 Resistance plate material 80 Ceramic case 90 Filler

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01C 3/00 H01C 17/24

Claims (1)

(57) [Claims] 1. A terminal mounting step of sequentially mounting terminals on a strip-shaped resistor plate material, and measuring the resistance value between the pair of terminals while measuring the resistance value between the pair of terminals.
Lasers are alternately applied from the upper and lower sides of the resistor plate material
Cut by water or water jet cut
And the measured resistance value reaches a predetermined resistance value.
A plate, comprising: a cutting step for stopping a laser cut or a water jet cut; and a cutting step of cutting the resistor plate material after the completion of the cutting step for each portion to be a plate resistance element. A method for manufacturing a resistance element.