JP2007085994A

JP2007085994A - Distortion detecting device

Info

Publication number: JP2007085994A
Application number: JP2005277743A
Authority: JP
Inventors: Yasunobu Kobayashi; 康展小林; Toshiro Otobe; 敏郎乙部; Takaaki Ogawa; 孝昭小川; Yoshimitsu Ikeyama; 佳光池山
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2005-09-26
Filing date: 2005-09-26
Publication date: 2007-04-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distortion detecting device that improves the tensile strength. <P>SOLUTION: The distortion detecting device comprises an insulating substrate 11, providing at least two distortion elements 15 and 16 on one face and providing a sensitive hole 19 substantially at the center, a pushing member 20 for pushing the vicinity of the sensitive hole 19 against the insulating substrate 11, a fixing member 29 fixed on the insulating substrate 11, and a support member 25 for supporting the insulating substrate 11 via the fixing member 29. The fixing member 29 is fixed, running over the entire circumstance of the peripheral edge part of the other face of the side opposite to the one face providing distortion-resistant elements 15 and 16 in the insulating substrate 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、特に荷重を付加することによって発生する歪を検出する歪検出装置に関するものである。 The present invention relates to a strain detection apparatus that detects strain generated by applying a load.

従来のこの種の歪検出装置は、図５に示すような構成を有していた。 This type of conventional strain detection apparatus has a configuration as shown in FIG.

図５は従来の歪検出装置の側断面図、図６は同歪検出装置における支持部材の斜視図である。 FIG. 5 is a side sectional view of a conventional strain detection device, and FIG. 6 is a perspective view of a support member in the strain detection device.

図５、図６において、１は弾性材料からなる絶縁基板で、この絶縁基板１は略中央に上面から下面にわたって検出孔２を設けている。また、前記絶縁基板１の下面には歪抵抗素子３を４個設けており、この４個の歪抵抗素子３は電源電極（図示せず）、ＧＮＤ電極（図示せず）、一対の出力電極（図示せず）と電気的に接続することによりブリッジ回路を構成している。そしてまた、前記絶縁基板１の上面には押圧部材４を当接させるとともに、この押圧部材４により前記検出孔２の周囲を押圧している。さらに、前記絶縁基板１の下面には固定部材５を設けており、この固定部材５を前記押圧部材４に螺合させている。さらにまた、前記絶縁基板１の下側には、４個の歪抵抗素子３を覆うように支持部材６を設けるとともに、この支持部材６の上端には図６に示すように固着部材７を設け、この固着部材７を前記絶縁基板１の下面と当接させ、かつこの固着部材７の一部には切欠き８を設けている。 5 and 6, reference numeral 1 denotes an insulating substrate made of an elastic material. The insulating substrate 1 is provided with a detection hole 2 at the substantially center from the upper surface to the lower surface. Further, four strain resistance elements 3 are provided on the lower surface of the insulating substrate 1, and these four strain resistance elements 3 are a power supply electrode (not shown), a GND electrode (not shown), and a pair of output electrodes. A bridge circuit is configured by electrical connection with (not shown). Further, a pressing member 4 is brought into contact with the upper surface of the insulating substrate 1 and the periphery of the detection hole 2 is pressed by the pressing member 4. Further, a fixing member 5 is provided on the lower surface of the insulating substrate 1, and the fixing member 5 is screwed to the pressing member 4. Furthermore, a support member 6 is provided on the lower side of the insulating substrate 1 so as to cover the four strain resistance elements 3, and a fixing member 7 is provided on the upper end of the support member 6 as shown in FIG. The fixing member 7 is brought into contact with the lower surface of the insulating substrate 1, and a notch 8 is provided in a part of the fixing member 7.

以上のように構成された従来の歪検出装置について、次にその動作を説明する。 Next, the operation of the conventional strain detection apparatus configured as described above will be described.

絶縁基板１の略中央の上面に押圧部材４により押圧力が付加されると、この押圧力により前記絶縁基板１には曲げモーメントが発生し、この曲げモーメントにより前記絶縁基板１の下面に設けた歪抵抗素子３にも曲げモーメントが発生する。そして、この歪抵抗素子３に曲げモーメントが生じると歪抵抗素子３の抵抗値が変化するため、この抵抗値の変化を一対の出力電極（図示せず）と接続したリード線（図示せず）を介して外部のコンピュータ（図示せず）等に出力することにより、絶縁基板１に加わる押圧力を測定するものである。 When a pressing force is applied to the upper surface of the substantially central portion of the insulating substrate 1 by the pressing member 4, a bending moment is generated in the insulating substrate 1 by the pressing force, and the bending moment is provided on the lower surface of the insulating substrate 1. A bending moment is also generated in the strain resistance element 3. When a bending moment is generated in the strain resistance element 3, the resistance value of the strain resistance element 3 changes. Therefore, the change in the resistance value is connected to a pair of output electrodes (not shown). The pressing force applied to the insulating substrate 1 is measured by outputting to an external computer (not shown) or the like via the.

なお、この出願の発明に関する先行技術文献情報としては、例えば、特許文献１が知られている。
特開２００５−１０６８００号公報 As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 2005-106800 A

しかしながら、上記した従来の構成においては、支持部材６における固着部材７に切欠き８を設けているため、押圧部材４が上側に引張られると、支持部材６における切欠き８の近傍の固着部材７に引張応力が集中することになり、これにより、支持部材６における固着部材７と絶縁基板１との間が剥がれやすくなって、歪検出装置の引張強度が小さくなるという課題を有していた。 However, in the above-described conventional configuration, since the notch 8 is provided in the fixing member 7 in the support member 6, when the pressing member 4 is pulled upward, the fixing member 7 in the vicinity of the notch 8 in the support member 6. As a result, the tensile stress is concentrated on the support member 6, whereby the fixing member 7 and the insulating substrate 1 in the support member 6 are easily separated from each other, and the tensile strength of the strain detection device is reduced.

本発明は上記従来の課題を解決するもので、引張強度を向上させることができる歪検出装置を提供することを目的とするものである。 The present invention solves the above-described conventional problems, and an object of the present invention is to provide a strain detection device capable of improving the tensile strength.

上記目的を達成するために、本発明は以下の構成を有するものである。 In order to achieve the above object, the present invention has the following configuration.

本発明の請求項１に記載の発明は、少なくとも２つの歪抵抗素子を一方の面に設け、かつ略中央に検出孔を設けた絶縁基板と、この絶縁基板における検出孔の近傍を押圧する押圧部材と、前記絶縁基板に固着される固着部材と、この固着部材を介して前記絶縁基板を支持する支持部材とを備え、前記固着部材を絶縁基板における歪抵抗素子を設けた一方の面とは反対側の他方の面の周縁部全周にわたって固着したもので、この構成によれば、固着部材を絶縁基板における歪抵抗素子を設けた一方の面とは反対側の他方の面の周縁部全周にわたって固着しているため、前記押圧部材に引張力が発生した場合、固着部材の端部に引張応力が集中するということはなくなり、これにより、絶縁基板と固着部材との間は剥がれにくくなるため、引張強度の向上が図れるという作用効果を有するものである。 According to the first aspect of the present invention, there is provided an insulating substrate provided with at least two strain resistance elements on one surface and a detection hole at a substantially center, and a pressure for pressing the vicinity of the detection hole in the insulating substrate. A member, a fixing member that is fixed to the insulating substrate, and a support member that supports the insulating substrate via the fixing member, and the fixing member is a surface on which the strain resistance element is provided on the insulating substrate. According to this configuration, the fixing member is fixed to the entire periphery of the other surface opposite to the one surface on which the strain resistance element is provided on the insulating substrate. Since it is fixed over the circumference, when a tensile force is generated in the pressing member, the tensile stress is not concentrated on the end portion of the fixing member, thereby making it difficult to peel off between the insulating substrate and the fixing member. For tensile strength Improving and has a effect that can be achieved.

本発明の請求項２に記載の発明は、特に、固着部材の絶縁基板への固着手段として溶接または接着により固着したもので、この構成によれば、固着部材の絶縁基板への固着手段として溶接または接着により固着しているため、ネジ等の締結部材を設ける必要はなく、これにより、小型化が可能となる歪検出装置を提供できるという作用効果を有するものである。 The invention according to claim 2 of the present invention is particularly one in which the fixing member is fixed to the insulating substrate by welding or adhesion, and according to this configuration, the fixing member is fixed to the insulating substrate as welding means. Alternatively, since it is fixed by adhesion, there is no need to provide a fastening member such as a screw, and this has the effect of providing a strain detection device that can be miniaturized.

本発明の請求項３に記載の発明は、特に、支持部材に下方ストッパーを設け、この下方ストッパーにより、押圧部材の下方向への移動を規制するようにしたもので、この構成によれば、押圧部材に過大な押圧力が加わった場合、押圧部材は支持部材の下方ストッパーに当接して押圧部材の下方向への移動が規制されるため、絶縁基板が必要以上に変形するということはなくなり、これにより、絶縁基板が塑性変形してしまうということはなくなるため、歪検出装置の出力特性が劣化することはないという作用効果を有するものである。 In the invention according to claim 3 of the present invention, in particular, the support member is provided with a lower stopper, and the lower stopper restricts the downward movement of the pressing member. According to this configuration, When an excessive pressing force is applied to the pressing member, the pressing member abuts against the lower stopper of the support member and the downward movement of the pressing member is restricted, so that the insulating substrate is not deformed more than necessary. Thus, since the insulating substrate is not plastically deformed, the output characteristic of the strain detecting device is not deteriorated.

本発明の請求項４に記載の発明は、特に、固着部材に上方ストッパーを設け、この上方ストッパーにより、押圧部材の上方向への移動を規制するようにしたもので、この構成によれば、押圧部材に過大な引張力が加わった場合、押圧部材は固着部材の上方ストッパーに当接して押圧部材の上方向への移動が規制されるため、絶縁基板が必要以上に変形するということはなくなり、これにより、絶縁基板が塑性変形してしまうということはなくなるため、歪検出装置の出力特性が劣化することはないという作用効果を有するものである。 In the invention according to claim 4 of the present invention, in particular, the upper member is provided with an upper stopper, and the upper stopper restricts the upward movement of the pressing member. According to this configuration, When an excessive tensile force is applied to the pressing member, the pressing member contacts the upper stopper of the fixing member and the upward movement of the pressing member is restricted, so that the insulating substrate is not deformed more than necessary. Thus, since the insulating substrate is not plastically deformed, the output characteristic of the strain detecting device is not deteriorated.

以上のように本発明の歪検出装置は、少なくとも２つの歪抵抗素子を一方の面に設け、かつ略中央に検出孔を設けた絶縁基板と、この絶縁基板における検出孔の近傍を押圧する押圧部材と、前記絶縁基板に固着される固着部材と、この固着部材を介して前記絶縁基板を支持する支持部材とを備え、前記固着部材を絶縁基板における歪抵抗素子を設けた一方の面とは反対側の他方の面の周縁部全周にわたって固着しているため、前記押圧部材に引張力が発生した場合、固着部材の端部に引張応力が集中するということはなくなり、これにより、絶縁基板と固着部材との間は剥がれにくくなるため、引張強度の向上が図れるという優れた効果を有するものである。 As described above, the strain detection device of the present invention has an insulating substrate provided with at least two strain resistance elements on one surface and a detection hole substantially at the center, and a pressure that presses the vicinity of the detection hole in the insulating substrate. A member, a fixing member that is fixed to the insulating substrate, and a support member that supports the insulating substrate via the fixing member, and the fixing member is a surface on which the strain resistance element is provided on the insulating substrate. Since it is fixed over the entire periphery of the peripheral edge of the other surface on the opposite side, when a tensile force is generated in the pressing member, the tensile stress does not concentrate on the end of the fixing member. Since it is difficult to peel off between the fixing member and the fixing member, the tensile strength can be improved.

以下、一実施の形態を用いて、本発明の特に請求項１〜４に記載の発明について、図面を参照しながら説明する。 Hereinafter, the inventions described in the first to fourth aspects of the present invention will be described with reference to the drawings.

図１は本発明の一実施の形態における歪検出装置の分解斜視図、図２は同歪検出装置の側断面図、図３は同歪検出装置における絶縁基板の上面図、図４は同絶縁基板における保護層を取り外した状態を示す上面図である。 1 is an exploded perspective view of a strain detection device according to an embodiment of the present invention, FIG. 2 is a side sectional view of the strain detection device, FIG. 3 is a top view of an insulating substrate in the strain detection device, and FIG. It is a top view which shows the state which removed the protective layer in a board | substrate.

図１〜図４において、１１は略正方形形状のニッケルを約０．１重量％含有するステンレスからなる絶縁基板で、この絶縁基板１１の一方の面である上面には図４に示すように、銀からなる電源電極１２、一対の出力電極１３、ＧＮＤ電極１４、２つの圧縮側歪抵抗素子１５および２つの引張側歪抵抗素子１６を設けており、これらを回路パターン１７によって電気的に接続することによりブリッジ回路を構成している。また、前記絶縁基板１１の上面には、図３に示すように、図４に示した圧縮側歪抵抗素子１５、引張側歪抵抗素子１６および回路パターン１７を覆うように保護層１８を設けている。さらに、前記絶縁基板１１には略中央に上面から下面にかけて検出孔１９を設けている。 1 to 4, reference numeral 11 denotes an insulating substrate made of stainless steel containing approximately 0.1% by weight of nickel having a substantially square shape. On the upper surface, which is one surface of the insulating substrate 11, as shown in FIG. A power supply electrode 12 made of silver, a pair of output electrodes 13, a GND electrode 14, two compression side strain resistance elements 15 and two tension side strain resistance elements 16 are provided, and these are electrically connected by a circuit pattern 17. Thus, a bridge circuit is configured. Further, as shown in FIG. 3, a protective layer 18 is provided on the upper surface of the insulating substrate 11 so as to cover the compression side strain resistance element 15, the tension side strain resistance element 16 and the circuit pattern 17 shown in FIG. Yes. Further, the insulating substrate 11 is provided with a detection hole 19 from the upper surface to the lower surface at substantially the center.

２０はニッケルを約４重量％含有するステンレス材料からなる押圧部材で、この押圧部材２０は絶縁基板１１の他方の面である下面側から絶縁基板１１の検出孔１９に挿入され、さらにこの押圧部材２０には、前記絶縁基板１１における検出孔１９の近傍を絶縁基板１１の他方の面である下面側から押圧する当接部２１を設けるとともに、図２に示すように、上部の外側面全体に雄ネジ２２を設け、かつ下端部に外方に突出するフランジ状のストッパー２３を設けている。２４はナットからなる金属製の固定部材で、この固定部材２４は内周部に設けた雌ネジ２４ａを前記押圧部材２０に設けた雄ネジ２２に螺合させることにより、前記絶縁基板１１を前記押圧部材２０とで挟持している。 Reference numeral 20 denotes a pressing member made of a stainless material containing about 4% by weight of nickel. This pressing member 20 is inserted into the detection hole 19 of the insulating substrate 11 from the lower surface side which is the other surface of the insulating substrate 11, and further this pressing member. 20 is provided with a contact portion 21 for pressing the vicinity of the detection hole 19 in the insulating substrate 11 from the lower surface side which is the other surface of the insulating substrate 11, and as shown in FIG. A male screw 22 is provided, and a flange-like stopper 23 protruding outward is provided at the lower end. Reference numeral 24 denotes a metal fixing member made of a nut. The fixing member 24 is formed by screwing a female screw 24 a provided on the inner peripheral portion with a male screw 22 provided on the pressing member 20, thereby fixing the insulating substrate 11. It is sandwiched between the pressing member 20.

２５は凹部形状をなす金属製の支持部材で、この支持部材２５は外底面に固定部２６を形成するとともに、この固定部２６の外側面全体には雄ネジ２７を設けている。また、前記凹部形状をなす支持部材２５の内底面には凸形状の下方ストッパー２８を設けており、そしてこの下方ストッパー２８は前記押圧部材２０における下端面に対向するものである。 Reference numeral 25 denotes a metal support member having a concave shape. The support member 25 has a fixed portion 26 formed on the outer bottom surface, and a male screw 27 is provided on the entire outer surface of the fixed portion 26. A convex lower stopper 28 is provided on the inner bottom surface of the concave support member 25, and the lower stopper 28 faces the lower end surface of the pressing member 20.

２９は前記支持部材２５を絶縁基板１１に固着するために用いられる円筒形状の固着部材で、この固着部材２９は図１に示すように、下部の外側面全体に雄ネジ２９ａを設けており、この雄ネジ２９ａに前記支持部材２５の内周部に設けた雌ネジ２５ａを螺合させることにより、この固着部材２９に前記支持部材２５を取り付けるようにしている。また、前記固着部材２９には、図１、図２に示すように、前記押圧部材２０の下端部に形成した外方に突出するストッパー２３が対向する上方ストッパー３０を設けている。 Reference numeral 29 denotes a cylindrical fixing member used for fixing the support member 25 to the insulating substrate 11. This fixing member 29 has a male screw 29a on the entire outer surface of the lower portion as shown in FIG. The support member 25 is attached to the fixing member 29 by screwing a female screw 25a provided on the inner peripheral portion of the support member 25 into the male screw 29a. Further, as shown in FIGS. 1 and 2, the fixing member 29 is provided with an upper stopper 30 opposed to an outwardly protruding stopper 23 formed at the lower end portion of the pressing member 20.

そして前記固着部材２９は、図２に示すように、絶縁基板１１における２つの圧縮側歪抵抗素子１５および２つの引張側歪抵抗素子１６を設けた一方の面とは反対側の他方の面の周縁部全周に上面円形部２９ｂを溶接によって固着しているもので、これにより、絶縁基板１１の周縁部は、固着部材２９に取り付けられた支持部材２５により支持されるものである。そして、この固着部材２９に設けた上方ストッパー３０は、図２に示すように、前記押圧部材２０を絶縁基板１１の検出孔１９に挿入した場合、押圧部材２０の下端部に形成した外方に突出するストッパー２３と前記絶縁基板１１との間に位置するように構成されている。 As shown in FIG. 2, the fixing member 29 is formed on the other surface of the insulating substrate 11 opposite to the one surface on which the two compression side strain resistance elements 15 and the two tension side strain resistance elements 16 are provided. The upper surface circular portion 29 b is fixed to the entire periphery of the peripheral portion by welding, whereby the peripheral portion of the insulating substrate 11 is supported by the support member 25 attached to the fixing member 29. As shown in FIG. 2, the upper stopper 30 provided on the fixing member 29 is formed outwardly at the lower end portion of the pressing member 20 when the pressing member 20 is inserted into the detection hole 19 of the insulating substrate 11. It is configured to be positioned between the protruding stopper 23 and the insulating substrate 11.

３１は金属製の取付板で、この取付板３１は支持部３２を一体的に形成しており、そしてこの支持部３２は図２に示すように、前記固着部材２９と支持部材２５とにより挟持されるものである。３３は回路基板で、この回路基板３３は上面にＩＣからなる処理回路３４を設けており、そしてこの処理回路３４は接続端子３５を介して前記絶縁基板１１における電源電極１２、一対の出力電極１３、ＧＮＤ電極１４と電気的に接続するようにしている。また、前記回路基板３３における処理回路３４は電源電極１２に電圧を負荷するとともに、ブリッジ回路を構成する圧縮側歪抵抗素子１５および引張側歪抵抗素子１６からの出力信号を処理している。 Reference numeral 31 denotes a metal mounting plate. The mounting plate 31 integrally forms a support portion 32. The support portion 32 is sandwiched between the fixing member 29 and the support member 25 as shown in FIG. It is what is done. Reference numeral 33 denotes a circuit board, and the circuit board 33 is provided with a processing circuit 34 made of an IC on its upper surface. , And are electrically connected to the GND electrode 14. The processing circuit 34 on the circuit board 33 applies a voltage to the power supply electrode 12 and processes output signals from the compression side strain resistance element 15 and the tension side strain resistance element 16 constituting the bridge circuit.

３６は樹脂製のケースで、このケース３６は内側にコネクタ端子３７を設けており、このコネクタ端子３７は前記回路基板３３における処理回路３４と電気的に接続されている。また、このケース３６は外底部に位置決め用の突部３８を設けており、そしてこの突部３８を前記取付板３１に設けた位置決め穴３９に挿入することにより、取付板３１に取り付けているものである。 Reference numeral 36 denotes a resin case, and the case 36 is provided with a connector terminal 37 on the inner side. The connector terminal 37 is electrically connected to the processing circuit 34 on the circuit board 33. The case 36 is provided with a positioning projection 38 on the outer bottom, and is attached to the mounting plate 31 by inserting the projection 38 into a positioning hole 39 provided in the mounting plate 31. It is.

上記したように本発明の一実施の形態においては、支持部材２５を絶縁基板１１に固着するための固着部材２９を前記絶縁基板１１における圧縮側歪抵抗素子１５および引張側歪抵抗素子１６を設けた一方の面とは反対側の他方の面の周縁部全周にわたって固着しているため、前記押圧部材２０に引張力が発生した場合、固着部材２９の端部に引張応力が集中するということはなくなり、これにより、絶縁基板１１と固着部材２９との間は剥がれにくくなるため、引張強度の向上が図れるものである。 As described above, in one embodiment of the present invention, the fixing member 29 for fixing the support member 25 to the insulating substrate 11 is provided with the compression side strain resistance element 15 and the tension side strain resistance element 16 in the insulating substrate 11. Since the entire periphery of the peripheral portion of the other surface opposite to the one surface is fixed, when a tensile force is generated in the pressing member 20, the tensile stress is concentrated on the end portion of the fixing member 29. As a result, it becomes difficult for the insulating substrate 11 and the fixing member 29 to peel off, so that the tensile strength can be improved.

また、本発明の一実施の形態においては、固着部材２９の絶縁基板１１への固着手段として溶接により固着しているため、ネジ等の締結部材を設ける必要はなく、これにより、小型化が可能となる歪検出装置を提供できるという効果を有するものである。 In the embodiment of the present invention, since the fixing member 29 is fixed to the insulating substrate 11 by welding, it is not necessary to provide a fastening member such as a screw. This has the effect of providing a strain detection device.

以上のように構成された本発明の一実施の形態における歪検出装置について、次にその組立方法について説明する。 Next, a method for assembling the strain detection apparatus according to the embodiment of the present invention configured as described above will be described.

まず、ステンレス板（図示せず）の下面にガラスペースト（図示せず）を印刷した後、約８５０℃で約１０分間焼成して絶縁基板１１を形成する。 First, after a glass paste (not shown) is printed on the lower surface of a stainless steel plate (not shown), the insulating substrate 11 is formed by baking at about 850 ° C. for about 10 minutes.

次に、前記絶縁基板１１の上面に位置して銀のペースト（図示せず）を印刷し、約８５０℃で約１０分間焼成することにより、前記絶縁基板１１の上面に電源電極１２、一対の出力電極１３、ＧＮＤ電極１４および回路パターン１７を形成する。 Next, a silver paste (not shown) is printed on the upper surface of the insulating substrate 11 and baked at about 850 ° C. for about 10 minutes. The output electrode 13, the GND electrode 14, and the circuit pattern 17 are formed.

次に、前記絶縁基板１１の上面の圧縮側歪抵抗素子１５および引張側歪抵抗素子１６を設ける位置にメタルグレーズ系ペースト（図示せず）を印刷した後、約１３０℃で約１０分間乾燥した後、絶縁基板１１を約８５０℃で約１０分間焼成することにより、絶縁基板１１に２つの圧縮側歪抵抗素子１５および２つの引張側歪抵抗素子１６を形成する。 Next, a metal glaze paste (not shown) is printed on the upper surface of the insulating substrate 11 at a position where the compression side strain resistance element 15 and the tension side strain resistance element 16 are provided, and then dried at about 130 ° C. for about 10 minutes. Thereafter, the insulating substrate 11 is baked at about 850 ° C. for about 10 minutes to form two compression-side strain resistance elements 15 and two tension-side strain resistance elements 16 on the insulating substrate 11.

次に、前記電源電極１２、一対の出力電極１３、ＧＮＤ電極１４を除くように絶縁基板１１の上面にガラスからなるペースト（図示せず）を印刷した後、約６４０℃で約１０分間焼成することにより、絶縁基板１１の上面に保護層１８を形成する。 Next, a paste made of glass (not shown) is printed on the upper surface of the insulating substrate 11 so as to remove the power supply electrode 12, the pair of output electrodes 13, and the GND electrode 14, and then baked at about 640 ° C. for about 10 minutes. Thus, the protective layer 18 is formed on the upper surface of the insulating substrate 11.

次に、前記絶縁基板１１の下面の周縁部全周に固着部材２９の上面円形部２９ｂを当接させた後、溶接により固着部材２９を絶縁基板１１の下面に固着する。 Next, after the upper surface circular portion 29b of the fixing member 29 is brought into contact with the entire periphery of the peripheral surface of the lower surface of the insulating substrate 11, the fixing member 29 is fixed to the lower surface of the insulating substrate 11 by welding.

次に、前記円筒形状の固着部材２９の内側に押圧部材２０を位置させるとともに、この押圧部材２０を絶縁基板１１の下面側から絶縁基板１１の検出孔１９に挿入する。これにより、押圧部材２０は当接部２１が絶縁基板１１の下面側における検出孔１９の周辺部に当接するとともに、雄ネジ２２を設けた押圧部材２０の上部が絶縁基板１１の上面側に突出するため、この突出した上部の雄ネジ２２に固定部材２４の雌ネジ２４ａを螺合させることにより、押圧部材２０を絶縁基板１１に取り付ける。 Next, the pressing member 20 is positioned inside the cylindrical fixing member 29, and the pressing member 20 is inserted into the detection hole 19 of the insulating substrate 11 from the lower surface side of the insulating substrate 11. As a result, the pressing member 20 comes into contact with the peripheral portion of the detection hole 19 on the lower surface side of the insulating substrate 11 and the upper portion of the pressing member 20 provided with the male screw 22 protrudes toward the upper surface side of the insulating substrate 11. Therefore, the pressing member 20 is attached to the insulating substrate 11 by screwing the female screw 24a of the fixing member 24 into the protruding upper male screw 22.

次に、取付板３１の支持部３２を固着部材２９の雄ネジ２９ａの外周に装着し、そして固着部材２９の雄ネジ２９ａに支持部材２５の内周部に設けた雌ネジ２５ａを螺合させることにより、取付板３１を固着部材２９と支持部材２５との間に挟持する。 Next, the support portion 32 of the mounting plate 31 is attached to the outer periphery of the male screw 29a of the fixing member 29, and the female screw 25a provided on the inner peripheral portion of the support member 25 is screwed into the male screw 29a of the fixing member 29. Thus, the mounting plate 31 is sandwiched between the fixing member 29 and the support member 25.

次に、取付板３１の位置決め穴３９にケース３６の外底部に設けた位置決め用の突部３８を合わせて挿入することにより、ケース３６を取付板３１に取り付ける。 Next, the case 36 is attached to the attachment plate 31 by inserting the positioning projections 38 provided on the outer bottom of the case 36 into the positioning holes 39 of the attachment plate 31.

次に、ケース３６の内側に位置するコネクタ端子３７と回路基板３３とをはんだ付けにより接続する。 Next, the connector terminal 37 positioned inside the case 36 and the circuit board 33 are connected by soldering.

最後に、接続端子３５の一端側を回路基板３３とはんだ付けした後、接続端子３５の他端側を絶縁基板１１の電源電極１２、一対の出力電極１３、ＧＮＤ電極１４にそれぞれはんだ付けする。 Finally, after soldering one end side of the connection terminal 35 to the circuit board 33, the other end side of the connection terminal 35 is soldered to the power supply electrode 12, the pair of output electrodes 13, and the GND electrode 14 of the insulating substrate 11.

以上のように構成され、かつ組み立てられた本発明の一実施の形態における歪検出装置について、次に、その動作を説明する。 Next, the operation of the strain detection apparatus constructed and assembled as described above according to an embodiment of the present invention will be described.

まず、押圧部材２０における雄ネジ２２を相手側取付部材（図示せず）に取り付ける。この状態で、押圧部材２０に上方より押圧力が作用すると、この押圧力により前記絶縁基板１１の表面に歪が発生し、絶縁基板１１の上面に設けた圧縮側歪抵抗素子１５に圧縮応力が作用するとともに、引張側歪抵抗素子１６に引張応力が作用する。そして、この圧縮側歪抵抗素子１５および引張側歪抵抗素子１６に歪が発生すると、この圧縮側歪抵抗素子１５および引張側歪抵抗素子１６は抵抗値が変化するため、この抵抗値の変化を一対の出力電極１３からブリッジ回路としての出力を外部のコンピュータ（図示せず）に出力し、これにより、絶縁基板１１に加わる荷重を測定するものである。 First, the male screw 22 in the pressing member 20 is attached to a counterpart attachment member (not shown). In this state, when a pressing force is applied to the pressing member 20 from above, distortion is generated on the surface of the insulating substrate 11 due to the pressing force, and compressive stress is applied to the compression-side strain resistance element 15 provided on the upper surface of the insulating substrate 11. At the same time, a tensile stress acts on the tension-side strain resistance element 16. When the compression-side strain resistance element 15 and the tension-side strain resistance element 16 are strained, the resistance values of the compression-side strain resistance element 15 and the tension-side strain resistance element 16 change. An output as a bridge circuit is output from a pair of output electrodes 13 to an external computer (not shown), thereby measuring a load applied to the insulating substrate 11.

ここで、歪検出装置における押圧部材２０に、上方から予期せぬ過大な押圧力が作用した場合、押圧部材２０は下方に移動することになるが、この場合、本発明の一実施の形態における歪検出装置においては、押圧部材２０に上方から予期せぬ過大な押圧力が作用した場合、押圧部材２０の下端面が支持部材２５の内底面に設けた下方ストッパー２８に当接するため、それ以上に押圧部材２０が下方に移動することはなくなり、これにより、絶縁基板１１が必要以上に変形するということはなくなるため、絶縁基板１１が塑性変形してしまうということはなくなり、これにより、歪検出装置の出力特性が劣化することはないという効果を有するものである。 Here, when an unexpected excessive pressing force acts on the pressing member 20 in the strain detection apparatus from above, the pressing member 20 moves downward. In this case, in the embodiment of the present invention, In the strain detection device, when an unexpected excessive pressing force is applied to the pressing member 20 from above, the lower end surface of the pressing member 20 comes into contact with the lower stopper 28 provided on the inner bottom surface of the support member 25. In this case, the pressing member 20 does not move downward, so that the insulating substrate 11 is not deformed more than necessary, so that the insulating substrate 11 is not plastically deformed. The output characteristic of the apparatus is not deteriorated.

また、上記とは反対に、押圧部材２０に予期せぬ過大な引張力が作用した場合、押圧部材２０は上方に移動することになるが、この場合、本発明の一実施の形態における歪検出装置においては、押圧部材２０に予期せぬ過大な引張力が作用した場合、押圧部材２０のストッパー２３が固着部材２９の上方ストッパー３０に当接するため、それ以上に押圧部材２０が上方に移動することはなくなり、これにより、絶縁基板１１が必要以上に変形するということはなくなるため、絶縁基板１１が塑性変形してしまうということはなくなり、これにより、歪検出装置の出力特性が劣化することはないという効果を有するものである。 Contrary to the above, when an unexpected excessive tensile force acts on the pressing member 20, the pressing member 20 moves upward. In this case, strain detection in one embodiment of the present invention is performed. In the apparatus, when an unexpected excessive tensile force acts on the pressing member 20, the stopper 23 of the pressing member 20 contacts the upper stopper 30 of the fixing member 29, so that the pressing member 20 moves further upward. As a result, the insulating substrate 11 will not be deformed more than necessary, so that the insulating substrate 11 will not be plastically deformed, thereby deteriorating the output characteristics of the strain detection device. It has the effect of not.

なお、上記本発明の一実施の形態においては、固着部材２９の絶縁基板１１への固着手段として溶接により固着するようにしたものについて説明したが、この固着手段は溶接に限定されるものではなく、溶接以外の接着により固着するようにした場合でも、上記本発明の一実施の形態と同様の効果が得られるものである。 In the above-described embodiment of the present invention, the fixing member 29 is fixed to the insulating substrate 11 by welding, but the fixing means is not limited to welding. Even when fixed by adhesion other than welding, the same effects as those of the embodiment of the present invention can be obtained.

本発明にかかる歪検出装置は、引張強度の向上が図れるという効果を有し、自動車のシート重量を検出する用途に適用できるものである。 The strain detection device according to the present invention has an effect that the tensile strength can be improved, and can be applied to a use for detecting the seat weight of an automobile.

本発明の一実施の形態における歪検出装置の分解斜視図The disassembled perspective view of the distortion | strain detector in one embodiment of this invention 同歪検出装置における側断面図Side sectional view of the strain detection device 同歪検出装置における絶縁基板の上面図Top view of insulating substrate in the strain detection device 同絶縁基板における保護層を取り外した状態を示す上面図Top view showing a state where the protective layer is removed from the insulating substrate 従来の歪検出装置を示す側断面図Side sectional view showing a conventional strain detection device 同歪検出装置における支持部材の斜視図A perspective view of a support member in the strain detection device

符号の説明Explanation of symbols

１１絶縁基板
１５、１６歪抵抗素子
１９検出孔
２０押圧部材
２５支持部材
２８下方ストッパー
２９固着部材
３０上方ストッパー DESCRIPTION OF SYMBOLS 11 Insulation board | substrates 15 and 16 Strain resistance element 19 Detection hole 20 Pressing member 25 Support member 28 Lower stopper 29 Fixing member 30 Upper stopper

Claims

少なくとも２つの歪抵抗素子を一方の面に設け、かつ略中央に検出孔を設けた絶縁基板と、この絶縁基板における検出孔の近傍を押圧する押圧部材と、前記絶縁基板に固着される固着部材と、この固着部材を介して前記絶縁基板を支持する支持部材とを備え、前記固着部材を絶縁基板における歪抵抗素子を設けた一方の面とは反対側の他方の面の周縁部全周にわたって固着した歪検出装置。 An insulating substrate provided with at least two strain resistance elements on one surface and provided with a detection hole substantially at the center, a pressing member for pressing the vicinity of the detection hole in the insulating substrate, and a fixing member fixed to the insulating substrate And a support member that supports the insulating substrate via the fixing member, and the fixing member is disposed over the entire periphery of the other surface of the insulating substrate opposite to the one surface on which the strain resistance element is provided. Fixed strain detection device.

固着部材の絶縁基板への固着手段として溶接または接着により固着した請求項１記載の歪検出装置。 The strain detection device according to claim 1, wherein the fixing member is fixed to the insulating substrate by welding or adhesion.

支持部材に下方ストッパーを設け、この下方ストッパーにより、押圧部材の下方向への移動を規制するようにした請求項１記載の歪検出装置。 The strain detection device according to claim 1, wherein a lower stopper is provided on the support member, and the downward stopper restricts the downward movement of the pressing member.

固着部材に上方ストッパーを設け、この上方ストッパーにより、押圧部材の上方向への移動を規制するようにした請求項１記載の歪検出装置。 The strain detection device according to claim 1, wherein an upper stopper is provided on the fixing member, and the upward movement of the pressing member is regulated by the upper stopper.