JP2005150567A - Resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lengthen a path on a resistor film to which an electric current flows without increasing the number of grooves of a resistor having a resistor film 5 formed in a band shape so as to extend to an appropriate width with an appropriate length on the upper surface of an insulating substrate 2 provided with a first getting-in groove 6 having a starting point 5' at one side of both the side faces 5', 5" along in a longitudinal direction and extending in a width direction to a region near to the other side face 5", and a second getting-in groove 7 having a starting point 5" at the other side 5" and extending in a width direction to a region near the one side 5'. <P>SOLUTION: An extending-groove 6' continued and extending from a tip of the first getting-in groove 6 to the region near the second getting-in groove 7, and an extending-groove 7' continued and extending from a tip of the first getting-in groove 7 to the region near the first getting-in groove 6 are provided between the first getting-in groove 6 and the second getting-in groove 7 of the resistor film 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resistor having improved surge resistance among resistors formed by forming a resistive film in a strip shape on the upper surface of an insulating substrate.

  In general, in a resistor formed by forming a resistive film on the upper surface of an insulating substrate, when a surge voltage generated by the influence of static electricity or power supply noise is applied to the resistor, its resistance value is likely to change. There is.

  It is known that the change in the resistance value due to the application of the surge voltage is improved by increasing the length of the path through which electricity flows in the strip-shaped resistance film.

  Therefore, Patent Document 1 and Patent Document 2 as the prior art propose to configure as described below in order to improve the surge resistance in this type of resistor.

  That is, this prior art resistor 31 includes a chip-shaped insulating substrate 32 and a pair of terminal electrodes 33 and 34 formed on the left and right ends of the upper surface of the insulating substrate 32, as shown in FIGS. The resistance film 35 is formed in a band shape having an appropriate width W so that both ends of the upper surface of the insulating substrate 32 are electrically connected to the terminal electrodes 33 and 34 between the terminal electrodes 33 and 34. The resistive film 35 has a starting end on one side surface 35 ′ of left and right side surfaces 35 ′ and 35 ″ along the length direction from the one terminal electrode 33 to the other terminal electrode 34. Then, the first entering groove 36 extending to the portion approaching the other side surface 35 ″ in the width direction perpendicular to the length direction, and the other side surface 35 ″ of the left and right side surfaces 35 ′, 35 ″ in the length direction. Have the same end Second resistance grooves 37 extending to a portion approaching one side surface 35 ′ in the width direction are alternately provided along the length direction of the resistance film 35 at an appropriate pitch P, and the resistance film 35 is A plurality of entering grooves 36 and 37 are formed in a zigzag shape that alternately bends in the width direction of the resistance film 35 in the state of the narrow width S, so that one terminal electrode 33 to the other terminal in the resistance film 35. The path through which electricity flows toward the electrode 34 is lengthened.

However, FIG.1 and FIG.2 shows the case where the said 1st penetration groove | channel 36 is made into two, and the said 2nd penetration groove | channel 37 is made into three.
JP-A-9-205004 JP 2001-338801 A

  In this prior art, the resistance film 35 is formed into a zigzag shape that is alternately bent in the width direction at the first entering groove 36 from one side surface 35 ′ and the second entering groove 37 from the other side surface 25 ″. Since the width of the zigzag fold does not exceed the width W of the resistance film, the length of the zigzag fold can be increased in order to lengthen the path of electricity flow in the resistance film. As a result, the number of the first and second entering grooves 36 and 37 must be increased.

  In this case, it is possible to form all the entering grooves 36 and 37 having a large number as described above by screen printing at the same time when the resistance film 35 is formed by screen printing. , 37 must be widened, and the pitch P between the respective entrance grooves 36, 37 must be widened, resulting in a significant increase in the size of the resistor 31 as a whole. .

  Further, as described above, all or most of the large number of each of the entering grooves 36 and 37 are formed by screen printing the resistance film 35, and then the trimming process such as laser beam irradiation to the resistance film 35 is performed. Although engraving can avoid an increase in the size of the resistor 31 as a whole, the number of places to which the trimming process is to be performed increases, so that the trimming process for engraving each of the entering grooves 36 and 37 is increased. There is a problem that the time required increases and the cost increases.

  An object of the present invention is to solve this problem and to ensure that the path through which electricity flows can be made long with a small number of entering grooves.

In order to achieve this technical problem, claim 1 of the present invention provides:
“Consisting of an insulating substrate and a resistive film formed in a strip shape on the upper surface of the insulating substrate so as to have an appropriate width dimension and an appropriate length, and one of the left and right side surfaces along the length direction of the resistive film. A first entry groove having a start end on the side surface and extending to a portion approaching the other side surface in the width direction perpendicular to the length direction, and a start end on the other side surface of the left and right side surfaces in the length direction. In the resistor, the second penetration groove extending to the portion approaching the one side surface in the width direction is provided at an appropriate interval in the length direction of the resistance film.
In the portion of the resistance film between the first and second entering grooves, the second entering groove extends from the tip of the first entering groove to the length direction continuously from the leading end of the first entering groove. And an extension groove extending continuously from the tip of the second entering groove to the part approaching the first entering groove in the length direction. "
It is characterized by that.

Further, claim 2 of the present invention provides
“In the description of claim 1, a plurality of the first entering grooves and the second entering grooves are provided.”
It is characterized by that.

Furthermore, claim 3 of the present invention provides
“In the first aspect of the present invention, an additional extension groove extending continuously from the tip of the extension groove in the first entering groove and a tip extending from the tip of the extension groove in the second entering groove are continuously extended. An additional extension groove is provided, and each of the entering grooves, these extension grooves, and each of the additional extension grooves constitutes a spiral as a whole.
It is characterized by that.

Effects and effects of the invention

  As in the first aspect of the present invention, an extension groove extending continuously from the tip of the first entry groove to a portion approaching the second entry groove in the length direction is provided, and the extension groove extends from the tip of the second entry groove. By providing an extension groove that extends continuously to the portion approaching the first entry groove in the length direction, a portion of the resistance film between the first entry groove and the second entry groove is provided. The first entry groove and its extension groove and the second entry groove and its extension groove can be formed into a zigzag shape that alternately bends in the length direction of the resistance film in a narrow width state.

  In other words, with the configuration described above, the zigzag folding direction can be the length direction of the resistive film, and the lateral width dimension of the zigzag folding can be increased so as to exceed the width dimension of the resistive film. The flowing path can be reliably lengthened without increasing the number of entering grooves provided therein.

  Therefore, according to the present invention, since the number of entering grooves provided in the resistance film can be reduced as compared with the conventional case described above, each of the entering grooves is simultaneously screen-printed when the resistance film is formed by screen printing. The size of the resistor can be avoided, and when the engraving grooves are engraved by trimming such as laser beam irradiation after the resistive film is formed by screen printing, the trimming is performed. The number of parts to be processed is reduced, and an increase in cost can be avoided.

  In particular, the configuration described in claim 2 can increase the number of zigzag folds and increase the length of the path through which electricity flows in the resistive film, thereby further improving the surge resistance characteristics of the resistor.

  Further, by adopting the configuration described in claim 3, the path through which electricity flows becomes spiral, and the path through which electricity flows in the resistance film can be made longer, so that surge resistance characteristics in the resistor are further improved. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  3 and 4 show the first embodiment.

  The resistor 1 according to the first embodiment includes a chip-shaped insulating substrate 2, a pair of terminal electrodes 3 and 4 formed on both left and right ends of the upper surface of the insulating substrate 2, and an upper surface of the insulating substrate 2. Of these, the resistor film 5 is formed between the terminal electrodes 3 and 4 in a band shape with a width W as appropriate so that both ends are electrically connected to the terminal electrodes 3 and 4.

  The resistance film 5 has a starting end on one side surface 5 'of the left and right side surfaces 5' and 5 "along the length direction from the one terminal electrode 3 to the other terminal electrode 4, and has the long end. A first entry groove 6 extending to a portion approaching the other side surface 5 ″ in the width direction perpendicular to the vertical direction, and the other side surface 5 ′ of the left and right side surfaces 5 ′, 5 ″ in the length direction has a start end. Similarly, a second entry groove 7 extending to the portion approaching the one side surface 5 ′ in the width direction is provided at an appropriate distance L in the length direction of the resistance film 5.

  The length of the resistive film 5 between the first entering groove 6 and the second entering groove 7 continues from the tip of the first entering groove 6 to the length direction. An extension groove 6 ′ extending to a portion approaching the second entering groove 7, and a portion approaching the first entering groove 6 in the length direction continuously from the tip of the second entering groove 7. The extending groove 7 'is provided.

  Reference numeral 8 denotes a cover coat that covers the entire resistance film 5, and the terminal electrodes 3 and 4 extend from the end surface of the insulating substrate 2 to the back surface of the insulating substrate 3. The extension groove 6 ′ in the first entry groove 6 and the extension groove 7 ′ in the second entry groove 7 are portions that divide the resistance film 5 into three equal narrow dimensions S in the width direction. Is provided.

  With this configuration, a portion of the resistance film 5 between the first entering groove 6 and the second entering groove 7 is formed between the first entering groove 6 and its extension groove 6 ′. In addition, the second entering groove 7 and its extension groove 7 ′ can be formed into a zigzag shape that alternately bends in the length direction of the resistance film 5 in the state of the narrow width S.

  That is, with the above-described configuration, the direction of the zigzag fold can be set to the length direction of the resistive film 5, and the lateral width dimension of the zigzag fold exceeds the width dimension W of the resistive film 5. Since the distance L between the second penetration groove 7 and the second penetration groove 7 can be increased, the path through which electricity flows in the resistance film 5 can be reliably lengthened without increasing the number of the penetration grooves provided therein.

  In the case of the first embodiment shown in FIG. 3 and FIG. 4, the path through which electricity flows by simply providing the two entrance grooves 6 and 7 in the resistance film 5 is shown in FIG. As in the conventional case shown in FIG.

  Next, FIG. 5 shows a resistor 11 according to the second embodiment.

  In the resistor 21 according to the second embodiment, the resistive film 15 is formed on the upper surface of the insulating substrate 12 in a strip shape so that both ends thereof are electrically connected to the pair of left and right terminal electrodes 13, 14. The first entering groove provided so as to enter from one side surface 15 'of the first and second side grooves 15a and 16b is formed as two first entering grooves 16a and the first entering groove 16b, and the other side surface 15' 'of the resistance film 15 This is a case where the second entering groove provided so as to enter from the inside is constituted by two of the second entering groove 17a and the second entering groove 17b.

  Even in this case, both the first entry grooves 16a and 16b of the resistance film 15 are provided between the first entry grooves 16a and 16b and the second entry grooves 17a and 17b. Extension grooves 16a 'and 16b' extending from the tip to the portion approaching the second entering grooves 17a and 17b in the longitudinal direction are provided, and the tips of the second entering grooves 17a and 17b are provided. Therefore, the extension grooves 17a 'and 17b' extending to the portions approaching the first entering grooves 16a and 16b in the length direction are provided continuously.

  In the case of this configuration, the extension groove 16a 'in one of the first entering grooves 16a and 16b and the second one of the two entering grooves 17a and 17b. The extension groove 17a 'in the entry groove 17a is provided in a portion of the resistive film 15 near the left and right side surfaces 15', 15 "in the length direction, and the other first of the first entry grooves 16a, 16b. An extension groove 16b 'in the second entry groove 16b is provided between the extension grooves 17a' and 17b 'in the second entry grooves 17a and 17b, and the other of the second entry grooves 17a and 17b. The extension groove 17b 'in the second entry groove 17b is provided between the extension grooves 16a' and 16b 'in the first entry grooves 16a and 16b.

  With this configuration, a portion of the resistance film 15 between the first entry grooves 16a and 16b and the second entry grooves 17a and 17b has a resistance of a narrow dimension S. In the case where the film 5 is alternately folded in the length direction, the number of the folding can be increased, so that the path of electricity can be further increased.

  Needless to say, the first entering groove and the second entering groove are not limited to two as described above, and may be a plurality of three or more.

  FIG. 6 shows a resistor 31 according to the third embodiment.

  In the resistor 21 according to the third embodiment, a resistive film 25 is formed on a top surface of an insulating substrate 22 in a strip shape so that both ends thereof are electrically connected to a pair of left and right terminal electrodes 23, 24. In addition, a first entering groove 26 from one side surface 25 'and a second entering groove 27 from the other side surface 25' 'are provided, and the leading end of each of the entering grooves 26, 27 continues to this. Extending extending grooves 26 'and 27' are provided in an L shape.

  Further, in addition to this, by providing additional extension grooves 26 "and 27" extending continuously from the ends of the respective extension tubs 26 'and 27', both of the entering grooves 26 and 27 and the extension grooves thereof are provided. 26 ', 27' and the additional extension grooves 26 ", 27" constitute a spiral as a whole.

  According to this configuration, since the path through which electricity flows in the resistance film 25 is spiral, the path through which electricity flows can be further increased.

It is a top view which shows the conventional resistor. FIG. 2 is a sectional view taken along line II-II in FIG. 1. It is a top view which shows the resistor by the 1st Embodiment of this invention. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a top view which shows the resistor by the 2nd Embodiment of this invention. It is a top view which shows the resistor by the 3rd Embodiment of this invention.

Explanation of symbols

1,11,21 Resistor 2,12,22 Insulating substrate 3,13,23 One terminal electrode 4,14,24 The other terminal electrode 5,15,25 Resistive film 5 ', 15', 25 'Resistive film One side surface 5 ″, 15 ″, 25 ″ The other side surface of the resistive film 6, 16a, 16b, 26 First entry groove 6 ′, 16a ′, 16b ′, 26 ′ Extension groove 7 of the first entry groove 7, 17a, 17b, 27 Second entry groove 7 ', 17a', 17b ', 27' Extension groove of second entry groove
26 "additional extension groove of the first entry groove 27" additional extension groove of the second entry groove

Claims (3)

An insulating substrate and a resistive film formed in a strip shape on the upper surface of the insulating substrate so as to have an appropriate width dimension and an appropriate length. The resistive film has one of left and right side surfaces along the length direction. A first entry groove having a start end on the side surface and extending to a portion approaching the other side surface in the width direction perpendicular to the length direction; and a start end on the other side surface of the left and right side surfaces in the length direction. And a second intrusion groove extending to a portion approaching one side surface in the width direction, with a suitable distance in the length direction of the resistance film,
In the portion of the resistance film between the first and second entering grooves, the second entering groove extends from the tip of the first entering groove to the length direction continuously from the leading end of the first entering groove. An extension groove extending to a portion approaching the first groove, and an extension groove extending continuously from the tip of the second entering groove to the portion approaching the first entering groove in the length direction. vessel.   2. The resistor according to claim 1, wherein a plurality of the first entry grooves and the second entry grooves are provided.   2. The additional extension groove extending continuously from the tip of the extension groove in the first entry groove and the extension extending continuously from the tip of the extension groove in the second entry groove according to claim 1. An extension groove is provided, and each of the entrance grooves, these extension grooves, and each of the additional extension grooves constitutes a spiral as a whole.

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