JPS58206101A - Composite resistor and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite resistor in which a plurality of resistance elements are housed in one chip, and a method for manufacturing the same.

Conventionally, such composite resistors as shown in FIGS. 1 to 4 are known.

Figure 1 (A) is an example of a half-finished product of a thick-film composite resistor (one chip), in which a conductor paste 2 (palladium-silver, etc.) and a resistor paste 3 are prepared based on a pattern set on the surface of a ceramic substrate l. (# & ruthenium chloride, etc.)
is screen printed, and after drying and baking, an overcoat 4 is applied thereon. Reference numeral 5 denotes a trimming portion, in which overcoat 4 and resistance paste 3 are applied to adjust the resistance value by laser or sandblasting.
It is a deleted version. Figure 1 (B) shows the li! This is a one-way diagram, and both have a common terminal.

FIG. 2 shows a state in which the naps 1-9 are inserted into the lead frame 7 (made of phosphor bronze, etc.) and soldered to each lead 7'. FIG. 3 shows a state in which an insulating device is further applied. When completed, each leat 7' is cut from the flakes 1 and 7 as shown by the two points &Jl line.

FIG. 4 omits the irregular pattern and trimming 5 when the resistance values of each paste resistance element 3 are made different.

However, conventional composite resistors using thick resistors produced by such a printing method have a fatal drawback of first-order principle.

~ ■ In the case of trial production, the resistance temperature characteristic that can be achieved is ±100
ppm/”C is the limit.

■ Because multiple resistor elements in one chip are printed with one type of resistor paste, even if the pattern is made a little more frugal as shown in Figure 4, the relative resistance range between each element is 5 to 6 times larger. is the limit.

If you want a wider resistance range than this, you can also prepare a different type of sheet resistance paste and screen.
The only option is to increase the number of prints.

■ Resistor failures are likely to occur after the trimming process. If even one element in a chip becomes defective, the chip becomes defective even if the other elements are good. Therefore, the requirements for integration, characteristics, and Deteriorate.

■ In the case of counterfeit products, the relative deviation between resistance value accuracy and chip content element integration is limited to 11%.

■ Material costs and business costs are low because we use woven thread paste and phosphor bronze lead frames.

■ Manufacturing equipment includes firing furnace, trimming equipment, etc. +441
Many of them are expensive, and the manufacturing costs are skyrocketing.

■ The range in which the initial resistance value can be adjusted to the target resistance value and accuracy by trimming is extremely narrow.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the drawbacks of the above-mentioned conventional techniques and to provide a composite resistor that has surface accuracy, is easy to manufacture, and is inexpensive, and a method for manufacturing the same.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

Figure 5 shows the external shape of the composite resistor (I chip) of the present invention. M is 1. IO is a saw body which is molded and has an insulating exterior, and 11 is an exposed reed.

6 to 8 each illustrate the internal structure of the composite resistor of the present invention.

Figure 6 (A) shows the curve of the composite resistor before it is coated with insulation.
The same figure <13) is a section rupture i1-direction view C. A plurality of axial lead type fixed resistors 13 having exposed leads 2 on one side of the axial direction of the base body I2, and one common terminal component (metal) 14 are arranged in one row in the axial direction of the base body 12. C'F4i is arranged and connected in air on the opposite side to the exposed Riet river l. '44 (Straw, Figure 6 (Δ) (B)
The exposed lead 11 is cut to an appropriate length on the opposite side, bent, and then the adjacent leads are soldered to each other. The exposed part (main body 10) excluding the exposed part 1-11 is physically molded, and then the electrical connection part is insulated as shown by the two-dot chain line. A device 6 is provided.

Figure 7 (A) (B) Smell - (Exposed part - 111 and the opposite side glue - 1" l 5 are cut to the root, and the base I
A conductive paste 19 is applied to the bottom of the cap 18, which is ground so that the end surface of the cap (metal) 17 placed over the end of the cap 18 is exposed.
is painted, and the common terminal component 14 and each fixed resistor 13 are electrically connected. Thereafter, an insulating device 6 is provided at the electrical connection portion as shown by the two-dot chain line in FIG. 7(B).

In FIG. 8 (A>(B), a metal wire 20 with a hole is fitted into the base of each lee F'15 on the opposite side to the exposed areas -1 and 11 in a direction substantially perpendicular to the axis of the base 12. Common terminal parts 14 by passing and soldering or by soldering metal wires 20.
and each fixed resistor 13 are electrically connected. After this, after cutting the tip from the connection part marked J, mold the molding material by injecting the molding material while supporting the glue on one side in a cantilevered manner.
・Mold.

In addition, in FIGS. 5 to 8, the pitch P between each exposed REIT 11 is the shortest hole distance 1i of the printed circuit board to be mounted.
11 (for example, 2.5 cranes or a multiple thereof).

Next, a method for manufacturing the above composite resistor will be explained.

FIG. 9 (A1-(E)) shows the process of manufacturing the composite resistor of the present invention as shown in FIG. A plurality of axial 9-torque fixed resistors 813 and one common terminal component 14 are arranged substantially parallel to the axial direction of the base body 12 (
A): Mold in this state.

That is, as shown in FIG.
The two end parts are mounted in the recess 22 of the lower die 21, and the respective parts 11 and 15 are fitted fully 23 and supported on both sides. Next, fit the middle mold 24 into the lower mold 21, and gradually lower the 1-mold 25.
Synthetic resin 27 is injected into the resin reservoir 26 and molded.
It will be molded.

After drying, the product taken out is shown in FIG. 9(B). Although the above molding method is a bot type, it can also be performed by one langeer set transfer molding or other methods.

Thereafter, the reed 15 is cut to an appropriate length (C), bent and soldered (D), and the electrical connection portions are insulated with each insulating device 6 (E).

11(A) to (E) show the steps for manufacturing the composite resistor of the present invention as shown in FIG. 7, and the steps up to (B) are the same as in the case of FIG. 9.

Below, each leat 15 is cut to the root C), lA1
8 in the direction perpendicular to the base 12, and 4I on the bottom.
19 to electrically connect the common terminal component 14 and each fixed resistor 13 (D), and fill in each insulating device 6 (E).

Moreover, FIGS. 12(A) to 12(D) simplify the steps for manufacturing the composite resistor of the present invention as shown in FIG. 8. First, a plurality of axial lead type fixed resistors I3 having grooves 11.15 on both sides in the axial direction of the base body 12 and one colloid M1 product 14 are arranged almost parallel to each other in the axial direction of the base body 12. (A), a conductive plate 20 with a hole is inserted into the root of each reat 15 in a direction substantially perpendicular to the base 12, or a metal wire 20 is soldered to connect it electrically.
&(B), each outside of this electrical connection -115
Cut (C).

Next, as shown in FIG. 13, the state shown in FIG. 12(C) is set in the molding die 28, and the molding die is Synthetic resin 27 is injected from the side of 28 and molded. In this case, the electrical connections are also integrally molded. Then, there is a C that was taken out at 7゛C in Figure 12 (1.

After this, 1. , passing through the culmζ
, the product is finished.

Firstly, since the composite resistor of the present invention and its manufacturability consist of the configuration described in 1 above, the following effects can be achieved.

■ Each of the 3-degree fixed resistors that make up a composite resistor has a unique appearance, and its characteristics such as groove cutting, knee bows, ribbing, and intermediate painting are determined before compounding by molding. Almost all the processing has already been completed, and only good products are selected after thorough examination, so products that are defective due to the presence of defective elements, such as conventional composite resistors using thick and thin gland resistors, are is almost eliminated, and the yield is good.

■ Commercially expensive equipment such as a firing furnace or trimming device is not required, and various automatic machines that are already widely used can be used for the process that requires characterization up to intermediate painting. .

・■ Resistance temperature characteristics can be achieved within ±5 ppm/°C, and resistance value accuracy can be achieved within a range of 0.1% to ±0.05%.

■ The relative resistance value range between each fixed resistor in the 1,000-knob is extremely wide, from several times to tens of thousands of times, because the resistance value of each fixed resistor can be determined arbitrarily.

② Material costs are low because expensive paste materials, Rietbrame, etc. are not used.

■ Since the resistance value can be adjusted in a very wide range, it is possible to mass-produce semi-finished products such as initial resistors, and its utilization is extremely advantageous in terms of sales and delivery.

(!,) The distance between the ends is 1m, and the axial length of the resistor body is 1m. ), I/4W'
C5 Dragon Pi, →- (Previously 12.5 to 15 ■ Cao Pinona)
Therefore, the mounting area on the printed board can be reduced to a large or medium size.

[Brief explanation of the drawing]

Figure 1(A) shows a conventional composite resistor with mid-addition f4j. 1 (13) is its circuit diagram, Fig. 2 is a 411 side view of the processed product inserted into the Ritsom L-me, and Fig. 1 (13) is an insulating exterior. Fig. 4 is an rH7 view of a conventional compound resistor with a mid-addition when pattern changes are included, and Fig. 5 is a cross-sectional view of a compound resistor of the present invention (example). ) perspective view, No. 6
Figure (A) is a top view of a composite resistor made of an example with an insulating exterior removed by 8%, and Figure 6 (B) is a partially cutaway front view of the same.
Fig. 7 (A) is a partially broken front view of a composite resistor according to another embodiment, Fig. 7 (13) is a partially broken side view, and Fig. 8 (A) is a further separate side view. A partially broken front view of a composite resistor made up of an example of 1, Figure 8 (B) is a partially broken side view of the composite resistor, and Figure 9 L/N (1 U) is shown in Figure 6. Make a composite resistor with a bulge if 4'
Figure 10 is a +L side view of the device used for molding 1, and Figures 11 (A) to (lj) are for manufacturing the composite resistor shown in Figure 7. 12(A) to 12(D) are plan views with the upper part omitted; FIGS.
The figure is a plan view of an apparatus used for molding the molding 1. IO...Composite resistor body, 11...Exposed -1,1
2...Base body, 13...Axo Yarly 1-type fixed i
'm b'+: Device I4... common terminal component, 15...
Reet, 16...Insulating exterior, 18...Groove, 19...
・Conductive paste, 20... conductive or metal wire with holes,
27...Synthetic resin. Patent issue 1 Tokyo Koon Denpa Co., Ltd. Figure 1 Figure 5 Figure 6 Figure 5 LpA'-~" Good Figure 7 1j Figure 8 (A) 0 "-"'V 3 (8) , 16 (B) 11 28 r Procedural Amendment Showa SR, -121R! 1 Patent Office Commissioner Kazuo Sugi Hit 1, Indication of Case 1984 Retention Request No. 8796
7 Yumi 3, the person making the amendment has no relation to 81 cases,,'
Month and date correction, 4th floor (Kokusho 57-87967):
T: A? Two r; #L, ＞'A −; y
! il +m, two toshitsu - Jf Th [two J)
pQ gu';s+jE ding已. 5. 1, 1, 1, 1, 1, 2,
Patent-41gD Immediate enclosure il1 Electrical components such as a plurality of axial lead type fixed resistors having exposed leads on one side of the axis of the base body are arranged approximately parallel to the axis direction of the base body 16J, and one air is connected on the side opposite to the exposed leads. An electrical component such as a composite resistor in which the parts connected to each other are integrally molded and the sliding parts are insulated and coated. (2) Immerse multiple lead-type fixed resistors with leads on both sides of the base. 11. While waiting for DI, inject the bottom mold material and mold, cut each piece 1) cm, and then cut the cut and @ part in one step to make the electrical parts. 131 Completed the restoration of electrical components such as lead-type fixed resistors 4 to enable leads to the substrate field Man C and 11].
After arranging the base in a nearly dry row, one person tied the roots of each reed and cut off the 4 ends beyond the connection, then tied the remaining equal reeds. While supporting it on a cantilever while being careful of: Injecting the i-teika and molding it'r'F! A method for manufacturing electrical components such as a composite resistor having f characteristics. 3. Change “compound resistor and” on page 2, line 8 to “f!l!
4. On page 5, line 1, ``Composite resistor 2'' is ``electrical parts such as low resistors'', 5. In line 3 of page 3, ``to change the truth''? ``For the case of full recovery and low resistance, 4 incontinence V''. , Regarding the above, I explained about rC in the case of 5'L tool, but this can also be applied to 4A parts in that area; and respective supplements., Patent applicant: Tokyo Kosha Ryunpa Co., Ltd.

Claims (1)

[Claims] +11 A plurality of axial lead type fixed resistors each having an exposed lead on one side of the base axis are arranged substantially parallel to the base axis and are electrically connected on the opposite side to the exposed lead. A composite resistor whose parts except the leads are integrally molded, and the electrical connections are covered with an insulated exterior. (2) A plurality of 7-axis lead type fixed resistors having leads on both sides of the base axis are arranged almost parallel to the base axis direction, and molded by injecting molding material while supporting each lead on both sides. After that, each lead on one side is cut, each cut part is electrically connected, and that part is covered with an insulating sheath. (3) After arranging a plurality of 7-wire lead type fixed resistors having leads on both sides of the base axis almost parallel to the base axis direction, the base of each lead on one side electrically connects the root and its 1. A method for manufacturing a composite resistor, which comprises cutting the tip from the connection part, and then injecting a molding material and molding the remaining leads while supporting each lead in a cantilever manner.