WO2005027150A1 - チップ抵抗器とその製造方法 - Google Patents
チップ抵抗器とその製造方法 Download PDFInfo
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- WO2005027150A1 WO2005027150A1 PCT/JP2004/013621 JP2004013621W WO2005027150A1 WO 2005027150 A1 WO2005027150 A1 WO 2005027150A1 JP 2004013621 W JP2004013621 W JP 2004013621W WO 2005027150 A1 WO2005027150 A1 WO 2005027150A1
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- WIPO (PCT)
- Prior art keywords
- groove
- resistive film
- longitudinal side
- trimming
- film
- Prior art date
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Classifications
-
- 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
- H01C17/26—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by converting resistive material
- H01C17/265—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by converting resistive material by chemical or thermal treatment, e.g. oxydation, reduction, annealing
- H01C17/267—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by converting resistive material by chemical or thermal treatment, e.g. oxydation, reduction, annealing by passage of voltage pulses or electric current
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
-
- 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
-
- 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
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
- H01C3/10—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration
- H01C3/12—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration lying in one plane
-
- 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
- H01C7/003—Thick film resistors
Definitions
- the present invention relates to a chip resistor having improved resistance to surges, and a method of manufacturing the same, among chip resistors formed by forming a resistive film on the upper surface of a chip-shaped insulating substrate.
- a chip resistor formed by forming a resistive film on the upper surface of a chip-shaped insulating substrate has a resistance when a surge voltage generated by the influence of static electricity, power supply noise, or the like is applied.
- a surge voltage generated by the influence of static electricity, power supply noise, or the like is applied.
- the value is easily changed. It is known that the change in the resistance value due to the surge voltage can be improved by increasing the length of the path through which electricity flows in the resistance film.
- Patent Documents 1 and 2 as prior arts describe chip resistors having improved surge resistance characteristics by being configured as described below.
- the chip resistor described in the former patent document 1 of the two patent documents is provided at the left and right ends of the upper surface of the chip-shaped insulating substrate ⁇ along the longitudinal direction.
- one end 5 and the other end 5b ′ in the longitudinal direction of the resistive film are electrically connected to the terminal electrodes and ′ while keeping the same width dimension W of the resistive film 5 ′.
- the resistance film 5 ′ further has a substantially central portion of the resistance film 5 ′ in the longitudinal direction, and the left and right long sides 5 c ′ and ⁇ ′ of the resistance film are connected from one long side 5 to the other long side 5 cT A first entry groove extending toward the second longitudinal side 5cT A second entry groove extending toward one longitudinal side surface 5, a first entry groove is located on the other end 51 side of the resistance film, and a second entry groove 8 ′ is located on one end 5 side of the resistance film 5 ′.
- the resistive films are formed at the same time when they are formed by screen printing so that they are adjacent to each other.
- a first trimming groove ⁇ is provided at a portion between the one end 5 and the second entry groove ⁇ of the resistive film from the one longitudinal side surface 5 to the other longitudinal side surface ⁇ '. It is engraved by irradiation of a laser beam or the like so as to extend in a direction toward the surface, and further, a second trimming groove 10 ′ is formed in a portion between the other end 5 and the first entering groove of the resistive film 5 ′. Is engraved by irradiation of a laser beam or the like so as to extend from the other longitudinal side surface 5cT toward the one longitudinal side surface 5 so as to extend the resistance film 5 ′ to the both entrance grooves 7 ′ and 8 ′.
- the chip resistor 21 'described in the former Patent Document 2 of the two Patent Documents is arranged along the longitudinal direction on the upper surface of the chip-shaped insulating substrate 22 ⁇ as shown in FIG.
- the terminal electrodes 23 ', 24' are formed on both left and right ends, and the insulating substrate 22 'having an appropriate width dimension W is formed on the upper surface of the insulating substrate 22', between the terminal electrodes 23 ', 24'.
- one end 25 in the longitudinal direction of the resistive film 25 ⁇ is attached to one of the left and right longitudinal side surfaces 25 and 25cT of the resistive film 2.
- a first narrow portion 26 ' is integrally provided on a portion of the longitudinal side face 25, and is electrically connected to the one terminal electrode 23 ⁇ via the first narrow portion 26 ⁇ , thereby forming the resistive film 25'.
- the other end 25b 'in the longitudinal direction of the resistive film 25' is connected to the left and right longitudinal side surfaces 25, 25 (1 'of the resistive film 25'.
- a narrow portion 27 ' is integrally provided at the portion of the longer side surface 25cT, and electrically connected to the other terminal electrode 24' through the second narrow portion 27 '.
- the resistance film 2 has a first entry groove 28 ′ extending from the other longitudinal side surface 25 d ′ toward the one longitudinal side surface 25 c ′ in a portion of the resistive film 25 ′ adjacent to the other end 25 b ′.
- a second entry groove 29 ′ that extends with the force of the one longitudinal side surface 25 toward the other longitudinal side surface 25 d ′ is formed, and the resistive film 2 is formed by screen printing. Form simultaneously when forming.
- a portion of the resistive film 25 'between the two entrance grooves 28' and 29 ', which is adjacent to the first entrance groove 28', is subjected to a first irradiation by a laser beam or the like.
- the trimming groove 30 'to the other long side 25cT Further, a portion of the resistive film 25 'between the two entrance grooves 28', 29 'adjacent to the second entrance groove 29' is irradiated with a laser beam or the like.
- the second trimming groove 31 ' is engraved so that the other longitudinal side face 25cT also extends toward the one longitudinal side face 25, and the resistive film 25' is trimmed to the two entrance grooves 28 ', 29' and both trimming sides.
- Patent Document 1 JP-A-2002-338801
- Patent Document 2 JP-A-9-205004
- the resistance film is formed into a zigzag shape at both of the grooves 7 ′ and 8 ′ and the trimming grooves, and 10 ′.
- the surge resistance can be reliably improved in a compact and lightweight state.
- the trimming grooves ⁇ and 10 ' are used to increase the number of windings for increasing the length of the path through which electricity flows in the resistive film, and to set the resistance between the terminal electrodes 4' to a predetermined value.
- the trimming groove ⁇ , 10 ′ is formed on both terminal electrodes 4 ′, 4 ′ while maintaining its width dimension W while the trimming groove ⁇ , 10 ′ is formed with both the trimming adjustment and the trimming adjustment so as to fall within the standard range. Since the rate of change in the resistance value per unit length in both the trimming grooves ⁇ and ic is small by being provided in the portion to be connected to the By engraving both trimming grooves and 10 ′, it takes time to adjust the resistance so that the resistance value falls within a predetermined rated range, and the productivity is low.
- the resistive film is intended to reduce the difference between the resistance value before forming both trimming grooves ⁇ and 10 'and the resistance value after forming both trimming grooves ⁇ and 10'.
- both ends of the resistive film 2 are provided with the narrow portions 26 ′ and 27 ′ that overlap the two terminal electrodes 23 ′ and 24 ′, thereby forming a meander.
- the number can be increased as compared with the case where one end of the resistive film 25 ⁇ is connected to the terminal electrode with a wide width as in Patent Document 1 without interposing a narrow portion, and
- the surge resistance can be greatly improved in a small and light state.
- the trimming grooves 3 (, 31 'are formed by increasing the number of folds in order to lengthen the path through which electricity flows in the resistive film, and between the terminal electrodes 23', 24 '.
- the trimming is performed separately so as to adjust the trimming so that the resistance value falls within a predetermined standard range.
- the position where the trimming groove is formed is determined by the resistance. If there is a shift in the longitudinal direction of the film, there is an error!
- the two trimming grooves 3 (, 31 / are formed so as to be adjacent to each other and are carved next to each other, the two trimming grooves 30 ', 31 / are carved separately.
- both trimming grooves 30 ', 31 / force When approaching each other due to the misalignment error, the distance S1 between the trimming grooves 30 'and 31' of the resistive film 25 'is set to a predetermined value, for example, the other end of the resistive film 25'. 251 /
- the gap between the force and the gap between the first groove 28 'and the one end 25a' The force also becomes smaller than the gap and the gap between the second groove 29 'and becomes defective. And the occurrence rate of defective products increases.
- the length dimension of the insulating substrate 22 must be increased accordingly, resulting in an increase in size and weight.
- the first aspect of the present invention relates to the above-mentioned problem that the chip resistor described in Patent Document 1 has, and the second aspect has the above-described problem that the chip resistor described in Patent Document 1 has. It is a technical task to solve each of the problems.
- a first aspect of the present invention is directed to a chip-shaped insulating substrate, a pair of terminal electrodes formed on both right and left ends of the upper surface of the insulating substrate, and the two terminal electrodes on the upper surface of the insulating substrate.
- a resistive film formed by screen printing so as to extend in the direction of both terminal electrodes with an appropriate width dimension in a portion between the resistive films, and the resistive film is provided on one side of one of the left and right longitudinal sides of the resistive film.
- a first entering groove extending toward the other longitudinal side and a second entering groove extending from the other longitudinal side toward the one longitudinal side are formed simultaneously when the resistive film is formed by screen printing.
- the one end in the longitudinal direction of the resistive film is electrically connected to the one terminal electrode while keeping the width dimension of the resistive film, and the other end in the longitudinal direction of the resistive film is formed.
- the first terminal groove and the second terminal groove are connected to the other terminal electrode via a narrow portion provided on the other longitudinal side surface of the left and right longitudinal sides of the resistive film.
- a first entry groove is disposed adjacent to each other at a substantially central portion in the longitudinal direction of the resistance film, with a first entry groove located at the other end of the resistance film and a second entry groove located at one end of the resistance film.
- a first trimming groove extends from the one longitudinal side surface to the other longitudinal side surface at a portion of the resistive film between one end thereof and the second entry groove.
- a second trimming groove extending from the other longitudinal side toward one longitudinal side at a portion between the other end of the resistive film and the first entrance groove. It is characterized by being carved.
- the first trimming groove of the two trimming grooves engraved in the resistive film is provided in a portion of the resistive film connected to one terminal electrode while keeping its width dimension.
- the rate of change of the resistance value per unit length in the first trimming groove is small as in the case of the prior art.
- the second trimming groove of the two trimming grooves is connected to the other end of the resistive film connected to the other terminal electrode via the narrow width portion and the first entry groove. And the rate of change of the resistance value per unit length in the second trimming groove is larger than the rate of change of the resistance value in the first trimming groove.
- a second trimming groove having a large rate of change in resistance value is formed by engraving the second trimming groove.
- the value is roughly trimmed so as to approach the specified rated value, and then the first trimming groove with a small rate of change in resistance value is carved so that the resistance value falls within the specified rated value range.
- the trimming can be precisely adjusted.
- the time required for trimming the resistance value so as to fall within a predetermined rated range by engraving the two trimming grooves while measuring the resistance value between both terminal electrodes is reduced by the first time.
- it Prior to the precise trimming adjustment by the trimming groove, it can be shortened by the amount of coarse trimming adjustment in the second trimming groove, so that productivity can be improved and the yield rate can be reduced, so that the manufacturing cost can be reduced.
- the distance between the first trimming groove force and the second entry groove, the distance between the first entry groove force and the second penetration groove, and the resistance The position at which each of the trimming grooves is also engraved with respect to the distance between the other end of the film and the second trimming groove is larger than the distance between the first and second grooved grooves.
- a step of forming terminal electrodes on both left and right ends of the upper surface of the chip-shaped insulating substrate, and a step of forming a terminal electrode between the two terminal electrodes on the upper surface of the insulating substrate Forming the resistive film by screen printing.
- the step of forming the resistive film by screen printing includes the step of forming one end of the resistive film in the longitudinal direction while maintaining the width of the resistive film at one end.
- a step of engraving so as to extend with the directional force.
- a second aspect of the present invention is directed to a chip-shaped insulating substrate, a pair of terminal electrodes formed on both right and left ends of an upper surface of the insulating substrate, and one of the upper surfaces of the insulating substrate.
- a resistor film formed by screen printing so as to extend in the direction of the both terminal electrodes with an appropriate width in a portion between the two terminal electrodes, and at one end in the longitudinal direction of the resistive film, the left and right sides of the resistive film are provided.
- a first narrow portion that is electrically connected to the one terminal electrode at one of the longitudinal side surfaces of the longitudinal side surface is provided at the other end in the longitudinal direction of the resistive film at the other end of the left and right longitudinal side surfaces of the resistive film.
- a second narrow portion which is electrically connected to the other terminal electrode is integrally provided at a portion of the longitudinal side surface, and further, a first portion extending from the one longitudinal side surface to the other longitudinal side surface on the resistive film. Entrance groove and other Of a second enter grooves extending towards the longitudinal side force one longitudinal side, the resistance In a chip resistor formed at the same time when a film is formed by screen printing, the above-mentioned first entering groove and the second entering groove are provided at a substantially central portion in the longitudinal direction of the resistive film with a first entry groove.
- the entry groove is disposed adjacent to each other with the second entry groove located on the other end side of the resistance film and the second entry groove is located on the one end side of the resistance film, respectively, and one end of the resistance film is connected to the second entry groove.
- a first trimming groove is engraved in a portion between the first and second longitudinal side surfaces so as to extend from the one longitudinal side surface to the other longitudinal side surface. Further, a first trimming groove is formed between the other end of the resistive film and the first entrance groove.
- a second trimming groove is engraved in a portion between the two so as to extend from the other longitudinal side surface toward the one longitudinal side surface.
- the first trimming groove and the second trimming groove are formed under the condition that the number of times that the resistive film is formed into two winding grooves and two trimming grooves in a zigzag manner is the same as in the prior art. Since the trimming grooves are separated from each other so that two entry grooves are located between them without being adjacent to each other, the positions at which these two trimming groove forces are separately engraved are separately engraved. When the distance between the two entry grooves and the two trimming grooves becomes smaller than a predetermined value when they approach each other due to a displacement error, the length dimension on the insulating substrate is reduced. The increase can be avoided without fail.
- both the one-end force in the resistive film and the interval dimension between the first trimming groove and the first trimming groove force and the first entrance groove force are different.
- the distance between the second trimming groove and the other end force in the resistive film is also smaller than the distance between the first groove and the second groove.
- the left and right sides of the upper surface of the chip-shaped insulating substrate A step of forming terminal electrodes at both ends and a step of forming a resistive film by screen printing on a portion of the upper surface of the insulating substrate between the two terminal electrodes, wherein the resistive film is formed by screen printing.
- the step of performing the first step includes, at one end in the longitudinal direction of the resistance film, a first narrow portion that is electrically connected to one terminal electrode at one of the left and right long side surfaces of the resistance film.
- a second narrow portion which is electrically connected to the other terminal electrode at a portion of the other one of the left and right longitudinal sides of the resistive film; and A first entrance groove extending from the one longitudinal side surface to the other longitudinal side surface, and a second entrance groove extending from the other long side surface to the one longitudinal side surface.
- FIG. 1 is a plan view of a chip resistor according to a first embodiment of the present invention.
- FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. 1.
- FIG. 3 is a view showing a first step in manufacturing the chip resistor of the first embodiment.
- FIG. 4 is a view showing a second step in manufacturing the chip resistor of the first embodiment.
- FIG. 5 is a view showing a third step in manufacturing the chip resistor of the first embodiment.
- FIG. 6 is a view showing a fourth step in manufacturing the chip resistor of the first embodiment.
- FIG. 7 is a plan view of a chip resistor according to a second embodiment of the present invention.
- FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG. 7.
- FIG. 9 is a view showing a first step in manufacturing the chip resistor of the second embodiment.
- FIG. 10 is a view showing a second step in manufacturing the chip resistor of the second embodiment.
- FIG. 11 is a view showing a third step in manufacturing the chip resistor of the second embodiment.
- FIG. 12 is a view showing a fourth step in manufacturing the chip resistor of the second embodiment.
- FIG. 13 is a plan view of a conventional chip resistor.
- FIG. 14 is a plan view of another conventional chip resistor.
- FIG. 1 and FIG. 2 show a chip resistor 1 according to a first embodiment of the present invention.
- the chip resistor 1 has terminal electrodes 3 and 4 formed on the left and right ends along the longitudinal direction on the upper surface of a rectangular chip-shaped insulating substrate 2 having a width D and a length L.
- a resistive film 5 extending in the longitudinal direction of the insulating substrate 2 with an appropriate width dimension W is screen-printed with a material paste, and thereafter. Formed by firing.
- one end 5a of the resistive film 5 in the longitudinal direction overlaps the one terminal electrode 3 while keeping the width dimension W of the resistive film 5 as it is.
- the other end 5b in the longitudinal direction of the resistive film 5 is integrally provided with a narrow portion 6 on the other longitudinal side 5d of the left and right longitudinal sides 5c and 5d of the resistive film 5. And electrically connected to the other terminal electrode 4 via the narrow portion 6, and further extends from the one longitudinal side surface 5c to the other longitudinal side surface 5d on the resistance film 5.
- the first entry groove 7 and the second entry groove 8 extending from the other longitudinal side surface 5d toward the one longitudinal side surface 5c are formed simultaneously when the resistive film 5 is formed by screen printing.
- the first entry groove 7 and the second entry groove 8 are placed substantially at the center of the resistance film 5 in the longitudinal direction, and the first entry groove 7 is connected to the other end 5b of the resistance film 5
- the second entry grooves 8 are disposed adjacent to each other with the second entry grooves 8 located on the one end 5a side of the resistance film 5 on the sides.
- a portion of the resistive film 5 between the one end 5a and the second entry groove 8 is A first trimming groove 9 formed by irradiating a light beam or the like is engraved so as to extend from the one longitudinal side surface 5c toward the other long side surface 5d, and further, is formed with the other end 5b of the resistance film 5.
- a second trimming groove 10 also formed by laser beam irradiation or the like is formed in the portion between the first entrance groove 7 so as to extend from the other longitudinal side surface 5d toward the one longitudinal side surface 5c. Accordingly, the resistive film 5 is formed in a zigzag shape by the two entering grooves 7 and 8 and the two trimming grooves 9 and 10.
- Reference numeral 11 denotes a cover coat formed so as to cover the entire resistive film 5 after engraving the trimming grooves 9 and 10.
- the terminal electrodes 3 and 4 extend to the back surface of the insulating substrate 2 via the left and right end surfaces 2a and 2b of the insulating substrate 2.
- the first trimming groove 9 of the two trimming grooves 9 and 10 engraved in the resistance film 5 has one of the resistance films 5 having the same width dimension W as that of the resistance film 5. Since the first trimming groove 9 is provided at a portion connected to the terminal electrode 3, the rate of change of the resistance value per unit length in the first trimming groove 9 is small as in the case of the prior art.
- the second trimming groove 10 of the two trimming grooves 9 and 10 is connected to the other terminal electrode 4 of the resistive film 5 via the narrow portion 6. Since the second trimming groove 10 is provided at a portion between the other end 5b and the first entrance groove 7, the rate of change of the resistance value per unit length in the second trimming groove 10 is equal to the resistance in the first trimming groove. Larger than the rate of change of the value.
- the resistance value of the second trimming groove 10 having a large rate of change in resistance value is measured. While trimming, the resistance value is coarsely adjusted so as to approach the specified rated value, and then the first trimming groove 9 with a small rate of change in resistance value is cut while measuring the resistance value. By doing so, the trimming can be precisely adjusted so that the resistance value falls within a predetermined rated value range.
- the chip resistor 1 having the above-described configuration is preferably manufactured through the following steps.
- the step of forming the terminal electrodes 3 and 4 may be performed after the step of forming the resistance film 5.
- a second trimming groove 10 is formed in the resistance film 5 by irradiating a laser beam or the like. At this time, by trimming the second trimming groove 10 while measuring the resistance value between the two terminal electrodes 3 and 4, the trimming is roughly adjusted so that the resistance value approaches a predetermined rated value.
- a first trimming groove 9 is formed in the resistance film 5 by irradiating a laser beam or the like. At this time, the first trimming groove 9 is engraved while measuring the resistance value between the two terminal electrodes 3 and 4 so that the resistance value can be precisely adjusted so as to fall within a predetermined rated value range. Adjust trimming.
- a cover coat 11 that covers the entire resistive film 5 is formed on the upper surface of the insulating substrate 2.
- FIGS. 7 and 8 show a chip resistor 21 according to a second embodiment of the present invention. You.
- the chip resistor 21 has terminal electrodes 23 and 24 on the left and right ends along the longitudinal direction on the upper surface of a rectangular chip-shaped insulating substrate 22 having a width dimension D and a length dimension L.
- a resistive film 25 extending in the longitudinal direction of the insulating substrate 22 with an appropriate width dimension W is screened with a material paste screen. It is formed by printing and subsequent firing.
- one end 25a in the longitudinal direction of the resistive film 25 has one of the left and right longitudinal side surfaces 25c and 25d of the resistive film 25.
- a first narrow portion 26 is integrally provided at the portion, and is electrically connected to the one terminal electrode 23 via the first narrow portion 26, and the other end of the resistive film 25 in the longitudinal direction is formed.
- a second narrow portion 27 is integrally provided on a portion of the other long side surface 25d of the left and right long side surfaces 25c and 25d of the resistive film 25, and the second narrow portion 27 is provided through the second narrow portion 27.
- a first entry groove 28 extending from the one longitudinal side surface 25c to the other longitudinal side surface 25d, and the other longitudinal side surface of the resistive film 25.
- a second insertion groove 29 extending from 25d toward one longitudinal side surface 25c is formed by the resistance Simultaneously formed when forming the 25 by screen printing.
- the first entry groove 28 and the second entry groove 29 are placed at a substantially central portion in the longitudinal direction of the resistance film 25, and the first entry groove 28 is provided at the other end 2 of the resistance film 25.
- the second entry grooves 29 are disposed adjacent to each other in a state where they are located on the one end 25a side of the resistance film 25, respectively.
- a first trimming groove 30 formed by irradiating a laser beam or the like is formed on a portion of the resistance film 25 between the one end 25a and the second entry groove 29 from the one longitudinal side surface 25c to the other. It is engraved so as to extend toward the longitudinal side surface 25d, and a portion between the other end 25b of the resistive film 25 and the first entrance groove 28 is similarly irradiated with a laser beam or the like.
- the resistance film 25 is formed by engraving the trimming groove 31 so as to extend from the other longitudinal side surface 25d toward the one longitudinal side surface 25c. , 31 to form a zigzag shape.
- Reference numeral 32 denotes the resistance after the trimming grooves 30 and 31 are engraved.
- 3 shows a cover coat formed so as to cover the entire film 25.
- the two terminal electrodes 23 and 24 extend to the rear surface of the insulating substrate 22 via the left and right end surfaces 22a and 22b of the insulating substrate 22.
- the number of times that the resistance film 25 is formed into two winding grooves 28 and 29 and two trimming grooves 30 and 31 in a zigzag manner as in the prior art is set.
- the first trimming groove 30 and the second trimming groove 31 are separated from each other so that the two entry grooves 28 and 29 are located between the two adjacent trimming grooves without being adjacent to each other.
- the two entrance grooves 28 and 29 and the two trimming grooves 30, 3 It is possible to reliably prevent the interval dimension between the first and second substrates from becoming smaller than a predetermined value, without increasing the length dimension L of the insulating substrate 2.
- the displacement error of the insulating substrate 22 toward one end and the displacement error of the insulating substrate 22 toward the other end are reduced.
- the minute dimension ⁇ 2 is set, the interval dimension A1 between one end 25a of the resistance film 25 and the first trimming groove 30 and the interval dimension A2 between the first trimming groove 30 and the second entry groove 29, (1)
- the spacing dimension A3 between the entry groove 28 and the second trimming groove 31 and the spacing dimension A4 between the other end 25b of the resistive film 25 and the second trimming groove 31 are each taken from the first entry groove 28. It is larger than the gap B between the second entry groove 29 and the gap error B by the amount of the positional deviation error ⁇ 2.
- the two entry grooves 28 and 29 are formed.
- two trims Each of the spacing dimensions Al, ⁇ 2, A3, and ⁇ 4 between the trimming grooves 30 and 31 has a resistance film 25 due to a positional deviation error when the two trimming grooves 30 and 113 are cut. Can be reliably prevented from being smaller than the interval dimension ⁇ between the two entry grooves 28, 29 formed at the same time when is formed by screen printing.
- the chip resistor 21 having the above-described configuration is preferably manufactured through the following steps.
- Membrane 25 Forming both the narrow portions 26 and 27 and both the indented grooves 28 and 29 on the resistive film 25 so as to overlap the terminal electrodes 23 and 24 by screen printing.
- the step of forming the terminal electrodes 23 and 24 may be performed before the step of forming the resistance film 25.
- a first trimming groove 30 is formed in the resistance film 25 by irradiating a laser beam or the like.
- the first trimming groove 30 is carved while measuring the resistance value between the two terminal electrodes 23 and 24, so that the resistance value is roughly trimmed so as to approach a predetermined rated value. adjust.
- a second trimming groove 31 is formed in the resistance film 25 by irradiating a laser beam or the like.
- the resistance value accurately falls within a predetermined rated value range. Adjust the trimming precisely.
- a cover coat 32 that covers the entire resistive film 25 is formed on the upper surface of the insulating substrate 22.
- the second trimming groove 31 is formed first, and then the first trimming groove 30 is formed so that the resistance value has a predetermined rated value. It may be configured so that the trimming is precisely adjusted to be within the range.
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/572,158 US7286039B2 (en) | 2003-09-17 | 2004-09-17 | Chip resistor and method of manufacturing the same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003324981A JP2005093718A (ja) | 2003-09-17 | 2003-09-17 | チップ抵抗器とその製造方法 |
JP2003-324980 | 2003-09-17 | ||
JP2003324980A JP2005093717A (ja) | 2003-09-17 | 2003-09-17 | チップ抵抗器とその製造方法 |
JP2003-324981 | 2003-09-17 |
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WO2005027150A1 true WO2005027150A1 (ja) | 2005-03-24 |
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PCT/JP2004/013621 WO2005027150A1 (ja) | 2003-09-17 | 2004-09-17 | チップ抵抗器とその製造方法 |
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US (1) | US7286039B2 (ja) |
KR (1) | KR20060069350A (ja) |
WO (1) | WO2005027150A1 (ja) |
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WO2008009280A1 (de) * | 2006-07-20 | 2008-01-24 | Epcos Ag | Widerstandselement mit ptc-eigenschaften und hoher elektrischer und thermischer leitfähigkeit |
Families Citing this family (6)
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KR20080027951A (ko) * | 2005-08-18 | 2008-03-28 | 로무 가부시키가이샤 | 칩 저항기 |
JP6618248B2 (ja) * | 2014-10-24 | 2019-12-11 | Koa株式会社 | 抵抗器およびその製造方法 |
JP7152184B2 (ja) * | 2018-05-17 | 2022-10-12 | Koa株式会社 | チップ抵抗器およびチップ抵抗器の製造方法 |
KR102137783B1 (ko) * | 2018-09-18 | 2020-07-24 | 삼성전기주식회사 | 세라믹 전자 부품 |
KR20220121379A (ko) | 2021-02-25 | 2022-09-01 | 삼성전기주식회사 | 칩 저항 부품 |
JP2022178503A (ja) * | 2021-05-20 | 2022-12-02 | Koa株式会社 | チップ抵抗器 |
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JPH0831623A (ja) * | 1994-07-20 | 1996-02-02 | Advantest Corp | 微細薄膜抵抗の作成方法 |
JPH09205004A (ja) * | 1996-01-26 | 1997-08-05 | Taiyoushiya Denki Kk | チップ抵抗器及びその製造方法 |
JP2001338801A (ja) * | 2000-05-30 | 2001-12-07 | Matsushita Electric Ind Co Ltd | 抵抗器およびその製造方法 |
JP2003022902A (ja) * | 2001-07-06 | 2003-01-24 | Matsushita Electric Ind Co Ltd | 抵抗器 |
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US4368093A (en) * | 1981-02-23 | 1983-01-11 | The Dow Chemical Company | Heating elements for thermoplastic lamination |
US4588976A (en) * | 1984-11-19 | 1986-05-13 | Microelettrica Scientifica S.P.S. | Resistors obtained from sheet material |
US5223820A (en) * | 1991-01-18 | 1993-06-29 | General Motors Corporation | Adaptive lamp monitor with single piece sensor |
US5379016A (en) * | 1993-06-03 | 1995-01-03 | E. I. Du Pont De Nemours And Company | Chip resistor |
US6401329B1 (en) * | 1999-12-21 | 2002-06-11 | Vishay Dale Electronics, Inc. | Method for making overlay surface mount resistor |
JP4502090B2 (ja) * | 2000-01-26 | 2010-07-14 | Tdk株式会社 | 電子部品及びその製造方法 |
JP2002338801A (ja) | 2001-05-18 | 2002-11-27 | Bando Chem Ind Ltd | Oa機器用導電性部材 |
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- 2004-09-17 KR KR1020057011287A patent/KR20060069350A/ko not_active Application Discontinuation
- 2004-09-17 WO PCT/JP2004/013621 patent/WO2005027150A1/ja active Application Filing
- 2004-09-17 US US10/572,158 patent/US7286039B2/en active Active
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JPH07302704A (ja) * | 1994-05-10 | 1995-11-14 | Matsushita Electric Ind Co Ltd | 抵抗器 |
JPH0831623A (ja) * | 1994-07-20 | 1996-02-02 | Advantest Corp | 微細薄膜抵抗の作成方法 |
JPH09205004A (ja) * | 1996-01-26 | 1997-08-05 | Taiyoushiya Denki Kk | チップ抵抗器及びその製造方法 |
JP2001338801A (ja) * | 2000-05-30 | 2001-12-07 | Matsushita Electric Ind Co Ltd | 抵抗器およびその製造方法 |
JP2003022902A (ja) * | 2001-07-06 | 2003-01-24 | Matsushita Electric Ind Co Ltd | 抵抗器 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008009280A1 (de) * | 2006-07-20 | 2008-01-24 | Epcos Ag | Widerstandselement mit ptc-eigenschaften und hoher elektrischer und thermischer leitfähigkeit |
US7902958B2 (en) | 2006-07-20 | 2011-03-08 | Epcos Ag | Resistor element with PTC properties and high electrical and thermal conductivity |
Also Published As
Publication number | Publication date |
---|---|
US7286039B2 (en) | 2007-10-23 |
US20070035379A1 (en) | 2007-02-15 |
KR20060069350A (ko) | 2006-06-21 |
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