WO2020203269A1 - 抵抗器 - Google Patents

抵抗器 Download PDF

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Publication number
WO2020203269A1
WO2020203269A1 PCT/JP2020/011807 JP2020011807W WO2020203269A1 WO 2020203269 A1 WO2020203269 A1 WO 2020203269A1 JP 2020011807 W JP2020011807 W JP 2020011807W WO 2020203269 A1 WO2020203269 A1 WO 2020203269A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistor
prismatic
exterior
resistance element
cap
Prior art date
Application number
PCT/JP2020/011807
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
隆史 内藤
亮 浦野
智順 須崎
Original Assignee
Koa株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koa株式会社 filed Critical Koa株式会社
Priority to CN202080021976.0A priority Critical patent/CN113811961B/zh
Publication of WO2020203269A1 publication Critical patent/WO2020203269A1/ja

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/034—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being formed as coating or mould without outer sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/148—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals embracing or surrounding the resistive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
    • H01C17/24—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material

Definitions

  • the present invention relates to a resistor, and more particularly to a surface-mounted resistor having a structure in which a columnar resistance element is molded.
  • a resistance film is formed on the peripheral surface of an insulating round bar-shaped substrate, metal hat-shaped caps are fitted on both ends, and the surface of the resistance film is further formed.
  • a resistor having an insulating coating (exterior body) formed therein is known.
  • An insulating and non-circular covering is formed around the entire periphery of the resistor film so that the cap comes into direct contact with the circuit body when the resistor is surface-mounted on the circuit board.
  • Patent Document 1 When manufacturing a resistor as shown in Patent Document 1, it is common to design a mold for forming a prismatic portion of an exterior body according to a distance (dimension) between cap terminals. By the way, there are variations in the dimensions between the terminals.
  • the dimensions between the cap terminals are> the dimensions of the exterior body, the resistance element is exposed from the exterior body, and when the dimensions between the cap terminals are ⁇ the dimensions of the exterior body, the exterior is on the cap terminals. Body resin may adhere. If the resistance element is exposed from the exterior body, the moisture resistance deteriorates, and the resistance value fluctuates and other adverse effects occur.
  • An object of the present invention is to improve the moisture resistance and mounting stability of a resistor regardless of the dimensional variation of the resistance element.
  • the resistor is a resistor in which cap terminals are attached to both ends of a cylindrical resistance element, and the entire body except for the cap terminals at both ends of the resistance element is covered with an exterior body.
  • a resistor is provided in which the body includes a prismatic exterior portion that covers a central portion of the resistance element, and a cylindrical exterior portion that is integrally formed with the prismatic exterior portion and is in contact with the cap terminal. It is preferable that the prismatic exterior portion is a prismatic type having a flat surface portion, and the flat surface portion has substantially the same dimensions as the outer diameter of the cap terminal.
  • the cylindrical exterior portion preferably has the same dimensions as the outer diameter of the cap terminal.
  • the longitudinal dimension of the prismatic exterior portion is preferably 90% or more of the dimension between the cap terminals at both ends of the resistance element. More preferably, it is 95% or more.
  • the resistance element is formed of a film resistor, and when a trimming groove is formed in the film resistor, the end portion of the trimming groove is located at a position corresponding to the corner portion of the prismatic exterior portion. It is good to do so.
  • This specification includes the disclosure of Japanese Patent Application No. 2019-069860, which is the basis of the priority of the present application.
  • moisture resistance and mounting stability can be improved regardless of the dimensional variation of the resistance element.
  • FIG. 2A is a side sectional view of the surface mount resistor shown in FIG. 1 along the line Ia-Ib, a sectional view cut along the line IIa-IIb, and an end view seen from the cap terminal direction.
  • FIG. 2B is a side sectional view of the surface mount resistor shown in FIG. 1 along the Ic-Id line, a sectional view cut along the IIc-IId line, and an end view seen from the cap terminal direction.
  • 3 (a) to 3 (c) are diagrams showing an example of a process of forming an exterior body of a resistor according to the present embodiment. It is a side view (FIG.
  • FIG. 4 (a) shows one structural example of the resistor which has the prismatic exterior part by 2nd Embodiment of this invention, and is the figure corresponding to the end view seen from the cap terminal direction in FIG. 2A. It is an end view seen from the cap terminal direction which shows the modification of the structure of the resistor which has the prismatic exterior part shown in FIG. It is a side view which shows one structural example of the resistor by the 3rd Embodiment of this invention.
  • FIG. 1 is a perspective view showing a configuration example of a surface-mounted resistor according to the first embodiment of the present invention.
  • FIG. 2A is a side sectional view of the surface mount resistor shown in FIG. 1 along the line Ia-Ib and a sectional view cut along the line IIa-IIb thereof.
  • FIG. 2B shows a side sectional view of the surface mount resistor shown in FIG. 1 along the Ic-Id line and a sectional view cut along the IIc-IId line (the sectional view shown in FIG. 2A is X1. Corresponds to the cross-sectional view rotated by 45 degrees with the rotation axis as the axis of rotation).
  • the resistor A includes the entire resistor element 1 (excluding the entire resistor element 1 except for the cap terminals 3a and 3b at both ends of the resistor element 1).
  • the resistor element 1 for example, a resistor covered with a mold resin.
  • the resistance element 1 is not limited, but for example, the following can be used. 1) A film resistance element in which a metal film, a carbon film, a metal glaze film, a metal oxide film resistance film, etc. are formed on the surface of a columnar insulating substrate (alumina, mullite, forsterite, etc.). 2) A resistance element in which a resistance wire (CuNi, NiCr, FeCr, CumnNi, etc.) is wound around a columnar insulating substrate or an outer peripheral surface of a glass fiber bundle. 3) A resistance element made of a conductive ceramic substrate.
  • the cap terminals 3a and 3b are, for example, metal terminals made of bottomed tubular stainless steel or the like, which are attached to both ends of the resistance element 1. In order to improve the solder wettability at the time of mounting the resistor A, plating such as Sn may be applied.
  • Exterior body (mold resin)
  • the entire resistance element 1 is covered with an exterior body 4 molded with an epoxy resin or the like.
  • the exterior body 4 is formed integrally with the prismatic prismatic exterior portion 5 that covers the central portion of the resistance element 1 and the prismatic exterior portion 5, and is a cylindrical exterior that is in contact with the cap terminals 3a and 3b. It has parts 7a and 7b.
  • the exterior body 4 has a length of L11 and a height of t1.
  • the width (depth) of the prismatic exterior portion 5 is W1.
  • the thickness of the mold resin is formed so as to be approximately ((t2-t1) / 2) thicker in the vicinity of the corner portion (ridge line) of the prismatic exterior portion 5.
  • the dimension between the cap terminals 3a and 3b is the prismatic exterior portion 5.
  • the length L10 is equal to the sum of the length L10a of the cylindrical exterior portion 7a and the length L10b of the cylindrical exterior portion 7b, and the prismatic exterior portion 5 and the cylindrical exterior portions 7a and 7b are integrally formed. Therefore, it is possible to prevent the resistance element 1 from being exposed from the exterior body 4 and the resin of the exterior body 4 from adhering to the cap terminals 3a and 3b. Therefore, the moisture resistance and the mounting stability can be improved regardless of the dimensional variation between the cap terminals 3a and 3b attached to both ends of the resistance element 1.
  • the prismatic exterior portion 5 is a prismatic type having a flat surface portion (first flat surface) 5a to 5d, for example, a flat surface portion (first flat surface) 5a to 5d.
  • the width W1 and the height t1 are substantially the same as the outer diameters (D1) of the cap terminals 3a and 3b.
  • the prismatic exterior portion 5 is a prismatic type having a wide flat surface portion (first flat surface) 5a to 5d, rotation with X1 as a rotation axis at the time of mounting is suppressed.
  • the width W1 and height t1 of the flat surface portion (first flat surface) 5a to 5d of the prismatic exterior portion 5 have substantially the same dimensions as the outer diameter D1 of the cap terminals 3a and 3b, so that the cap terminals 3a and 3b
  • the resistor A can be mounted on the circuit board with the bottom surface flat, so that the resistor A can be stably mounted on the circuit board. It will be possible.
  • the length L10 (FIG. 2B) of the prismatic exterior portion 5 in the X-axis direction is a portion of the resistance element 1 that is not covered by the cap terminals 3a and 3b, that is, the cap terminals 3a at both ends of the resistance element 1.
  • the heat generated from the resistance element 1 can be transmitted to the circuit board via the exterior body 4, and the heat dissipation of the resistor A is improved.
  • the corner portion (ridge line) of the prismatic exterior portion 5 can have a rounded shape according to the shape of the internal resistance element 1.
  • a characteristic step not found in the prior art in the method for manufacturing a resistor according to the present embodiment is a step of forming the exterior body 4 (molding step) using a mold.
  • 3 (a) to 3 (c) are views showing an example of a process of forming the exterior body 4 of the resistor according to the present embodiment.
  • FIG. 3A is a plan view of a step before molding in the molding step for forming the exterior body 4.
  • FIG. 3B is a cross-sectional view of the pre-molding step in the molding step along the lines IIIa-IIIb of FIG. 3A.
  • FIG. 4 is a side view (FIG. 4 (a)) and an end view (FIG. 4 (b)) of the molded resistor. It will be described as appropriate with reference to FIGS. 1 and 2.
  • the molds 21 and 23 have an inner surface shape for molding the exterior body 4 on the resistance element 1 to which the cap terminals 3a and 3b are mounted.
  • the cap terminals 3a and 3b of the produced resistance element 1 are sandwiched between the molds 21 and 23 heated to a predetermined temperature, and the resin R (FIG. 3 (b). )) Is poured from the gate G.
  • the mold 21 is for forming the inner surfaces 21c and 23c having a length L10 for forming the prismatic exterior portion 5 and the columnar exterior portions 7a and 7b. It has inner surfaces 21b, 23b and 21d, 23d that come into contact with the outer circumferences of the cap terminals 3a and 3b, respectively.
  • both end faces of the cap terminals 3a and 3b are designed to be in contact with the inner surfaces 21x, 23x and 21y, 23y of the molds 21 and 23, respectively. Thereby, leakage of the mold resin can be prevented.
  • the molds 21 and 23 have inner surfaces 21f and 23f forming a gate G into which the resin R is poured, and a flat surface portion (first flat surface) of the prismatic exterior portion 5 of the resistor A.
  • the exterior bodies 4 of the plurality of resistors can be molded.
  • the prismatic exterior portion 5 molded into the resistor 1 and the cylindrical exterior portions 7a and 7b are integrally molded by the mold resin, there is no gap, so that moisture and the like are prevented from entering and the moisture resistance is improved.
  • the gate of the prismatic exterior portion 5 A gate mark 31 remains at the position of G, and a parting line 33 remains.
  • the parting line refers to the protrusion of the injection material found in the parts molded using the mold.
  • a resin mold is formed by pouring a melted resin material into a place where two or more molds are combined. In the molded product, a portion where the resin material protrudes linearly appears at the joint of the mold, and this is called a parting line.
  • the molten resin material passes through a runner from a nozzle (not shown) and flows into the gate (inflow port) G, which is the entrance to the cavity of the molds 21 and 23.
  • the inflowing resin material is cooled and solidified as it is, and is cut after the molded product is taken out from the mold, so that the gate mark 31 remains on the molded product.
  • the gate mark 31 and the parting line 33 project to the outside of the prismatic exterior portion 5. Therefore, when the resistor A is mounted on a mounting board (not shown), the gate is formed on the flat surface portion (first flat surface) 5a to 5d (FIGS. 1 and 2) of the prismatic exterior portion 5 of the resistor A that comes into contact with the mounting board. If the marks 31 and the parting line 33 are present, an adsorption error occurs during mounting, or the resistor A (product) floats after mounting, resulting in poor stability, poor heat conduction, and poor solderability. Various problems such as becoming occur.
  • the molds 21 and 23 are designed to be tilted by 45 degrees so that the gate mark 31 and the parting line 33 are located diagonally to the prism of the prism exterior 5 as shown in FIG. did.
  • FIG. 5 is an end view showing a configuration example of a resistor having a prismatic exterior portion according to the second embodiment of the present invention, and corresponds to the end view seen from the cap terminal direction in FIG. 2A. It is a figure.
  • the resistor B according to the present embodiment is different from the resistor A according to the first embodiment in the following points.
  • the resistor B has a shape in which the corner portion of the mold resin along the ridgeline of the square pillar formed by the four first planes 5a to 5d forming the prismatic exterior portion 5 in the resistor A is curved. Instead, it is formed by the second planes 6a to 6d.
  • the widths of the first planes 5a to 5d are W12
  • FIG. 6 is a front view of the resistor C in which the second planes 6a to 6d are widened ( ⁇ Y corresponds to ⁇ Z) in the structure of the resistor having the prismatic exterior portion 5 shown in FIG. ..
  • the widths of the adjacent planes 6e, 6f and 6h, 6g shown in FIG. 6 of the second planes 6a to 6d of the resistor B are widened. It has a configuration in which the first plane (5b, 5d in FIG. 5) between 6e, 6f and 6h, 6g is narrowed so that, for example, only the vertices are formed.
  • the amount of mold resin used can be further reduced.
  • the lengths of the first planes 5a and 5c are lengthened to some extent. This makes it possible to prevent the central axis X1 from being easily rolled around the rotation axis.
  • the resistor according to the present embodiment has an advantage that the amount of the mold resin used can be reduced.
  • FIG. 7 is a side view showing a configuration example of a resistor according to the present embodiment.
  • the prismatic exterior portion 5 and the cylindrical exterior portions 7a and 7b are shown by broken lines.
  • the resistance element 1 is formed of a film resistor 8 that covers the surface of a cylindrical insulator or the like.
  • the resistance value can be adjusted by removing the film on the surface of the film resistor 8 (forming the trimming groove 8a).
  • the trimming start position P1 and the trimming end position P2 are arranged on the molds 21 and 23 (FIG. 3A) so as to be located within the range of the prismatic exterior portion 5 to form the exterior body 4. To do. At this time, it is more preferable that the ends P1 and P2 are located directly below the corner portion (ridge line of the prism) of the prismatic exterior portion 5. By doing so, the thick portion of the mold (prism-shaped exterior portion 5) can protect the ends P1 and P2 of the trimming groove 8a, which are vulnerable to pulse current. Therefore, in the resistor E having the coated resistor of the present embodiment, it is possible to suppress the deterioration of the resistor due to the pulse current, that is, to improve the pulse resistance.
  • the present invention can be used for resistors.
  • Resistors 1 Resistors 3a, 3b Cap terminals 4 Exterior 5 Prism-shaped exterior (part of exterior) 7a, 7b Cylindrical exterior part (part of exterior body) 8 Film Resistor 8a Trimming Grooves 21, 23 Molds 31 Gate Marks 33 Parting Line All publications, patents and patent applications cited herein are incorporated herein by reference in their entirety.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Details Of Resistors (AREA)
  • Non-Adjustable Resistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
PCT/JP2020/011807 2019-04-01 2020-03-17 抵抗器 WO2020203269A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080021976.0A CN113811961B (zh) 2019-04-01 2020-03-17 电阻器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-069860 2019-04-01
JP2019069860A JP7319811B2 (ja) 2019-04-01 2019-04-01 抵抗器

Publications (1)

Publication Number Publication Date
WO2020203269A1 true WO2020203269A1 (ja) 2020-10-08

Family

ID=72668643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/011807 WO2020203269A1 (ja) 2019-04-01 2020-03-17 抵抗器

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Country Link
JP (1) JP7319811B2 (zh)
CN (1) CN113811961B (zh)
TW (1) TWI720845B (zh)
WO (1) WO2020203269A1 (zh)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128651U (zh) * 1974-04-08 1975-10-22
JPS5275763U (zh) * 1975-12-05 1977-06-06
JPH031524U (zh) * 1989-05-25 1991-01-09
JPH0346227U (zh) * 1989-09-11 1991-04-30
JPH0817603A (ja) * 1994-06-24 1996-01-19 Matsushita Electric Ind Co Ltd 面実装部品
JPH10135001A (ja) * 1996-10-31 1998-05-22 Taiyo Yuden Co Ltd チップ部品及びその製造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003303705A (ja) * 2002-04-09 2003-10-24 Matsushita Electric Ind Co Ltd 静電気対策部品
JP2008141017A (ja) * 2006-12-01 2008-06-19 Taiyo Yuden Co Ltd サーミスタ及びサーミスタの製造方法
CN103151127B (zh) * 2013-03-07 2016-04-27 重庆大学 基于磁流变胶泥的电阻装置及磁控变阻器
CN206271486U (zh) * 2016-12-14 2017-06-20 深圳市格瑞特电子有限公司 一种方形塑封电阻器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128651U (zh) * 1974-04-08 1975-10-22
JPS5275763U (zh) * 1975-12-05 1977-06-06
JPH031524U (zh) * 1989-05-25 1991-01-09
JPH0346227U (zh) * 1989-09-11 1991-04-30
JPH0817603A (ja) * 1994-06-24 1996-01-19 Matsushita Electric Ind Co Ltd 面実装部品
JPH10135001A (ja) * 1996-10-31 1998-05-22 Taiyo Yuden Co Ltd チップ部品及びその製造方法

Also Published As

Publication number Publication date
JP7319811B2 (ja) 2023-08-02
TW202040600A (zh) 2020-11-01
CN113811961A (zh) 2021-12-17
JP2020170742A (ja) 2020-10-15
CN113811961B (zh) 2023-05-05
TWI720845B (zh) 2021-03-01

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