JPS6259817A - Load cell type scale - Google Patents

Load cell type scale

Info

Publication number
JPS6259817A
JPS6259817A JP19863885A JP19863885A JPS6259817A JP S6259817 A JPS6259817 A JP S6259817A JP 19863885 A JP19863885 A JP 19863885A JP 19863885 A JP19863885 A JP 19863885A JP S6259817 A JPS6259817 A JP S6259817A
Authority
JP
Japan
Prior art keywords
conductor pattern
load cell
printed wiring
amplifier
load
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP19863885A
Other languages
Japanese (ja)
Inventor
Yoshihisa Nishiyama
西山 義久
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba TEC Corp
Original Assignee
Tokyo Electric Co Ltd
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 Tokyo Electric Co Ltd filed Critical Tokyo Electric Co Ltd
Priority to JP19863885A priority Critical patent/JPS6259817A/en
Publication of JPS6259817A publication Critical patent/JPS6259817A/en
Pending legal-status Critical Current

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  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Structure Of Printed Boards (AREA)

Abstract

PURPOSE:To prevent malfunction from being caused by radio wave disturbance by forming a three-layer structure by sandwiching a printed wiring board where a conductor pattern for by-passing a radio wave is formed between a couple of printed wiring boards where a conductor pattern for a signal circuit is formed. CONSTITUTION:The printed wiring board 9 where the conductor pattern for by-passing a radio wave is sandwiched between the couple of printed wiring boards 8 and 10 where the conductor pattern for the signal circuit is formed to form the three-layer structure; and an amplifier is connected to the signal circuit conductor pattern in it and the radio wave by-passing conductor pattern is connected to the wall surface of a load cell 2. Further, the amplifier is covered with a shield case 13, which is connected to the ratio wave by-passing conductor pattern. Then, the amplifier is composed of an IC-implemented operational amplifier 12 and a through type ceramic capacitor is mounted at each terminal of the amplifier and one electrode of each capacitor is connected to the radio wave by-passing conductor pattern 9. Consequently, malfunction is prevented from being caused by radio wave disturbance.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明はロードセル式秤に関する。[Detailed description of the invention] [Industrial application field] This invention relates to a load cell scale.

[従来の技術] 一般にロードセル式秤はロードセルに荷重をかけてその
荷重に対応した電圧信号を出力し、その電圧信号を演算
増幅器などの増幅器で増幅し、その増幅した電圧信号を
A/D変換器で荷重に対応したカウント信号に変換し、
そのカウント信号から屯は値を算出して表示している。
[Prior Art] Generally, a load cell scale applies a load to a load cell, outputs a voltage signal corresponding to the load, amplifies the voltage signal with an amplifier such as an operational amplifier, and converts the amplified voltage signal into an A/D converter. convert it into a count signal corresponding to the load,
The value is calculated and displayed from the count signal.

[発明が解決しようとする問題点] ところで最近ではマーケットが大形化していることもあ
って店内の防犯管理に携帯用の無線機が使用されること
が多くなっているが、このような無線機をロードセル式
秤の近くで使用されると電波の影響を受けて高周波電圧
が誘起され、このような現象が発生すると従来のもので
は増幅器か高周波電圧の影響を受けて誤動作する問題か
あった。
[Problems to be solved by the invention] Recently, as the market has become larger, portable wireless devices are increasingly being used for security management in stores; When a machine is used near a load cell type scale, it is affected by radio waves and a high frequency voltage is induced, and when this phenomenon occurs, with conventional models, there was a problem that the amplifier would malfunction due to the influence of the high frequency voltage. .

この発明はこのような問題を解決するために為されたも
ので、電波の影響を極力防止でき、電波障害による誤動
作を防止できるロードセル式秤を提供することを目的と
する。
The present invention was made to solve such problems, and an object of the present invention is to provide a load cell scale that can prevent the influence of radio waves as much as possible and prevent malfunctions due to radio wave interference.

[問題点を解決するための手段] この発明は、荷重に応じた電圧信号を出力するロードセ
ルを有し、そのロードセル出力を増幅器で増幅して荷重
信号を得るようにしたロードセル式秤において、信号回
路用導体パターンを形成した一対のプリント配線板の間
に電波のバイパス用導体パターンを形成したプリント配
線板を挟んで3層構造とし、その内の信号回路用導体パ
ターンに増幅器を接続し、かつ電波のバイパス用導体パ
ターンをロードセルの壁面に接続したものである。
[Means for Solving the Problems] The present invention provides a load cell type scale that has a load cell that outputs a voltage signal corresponding to a load, and the load cell output is amplified by an amplifier to obtain a load signal. A three-layer structure is constructed by sandwiching a printed wiring board on which a conductor pattern for bypassing radio waves is formed between a pair of printed wiring boards on which a conductor pattern for circuits is formed, and an amplifier is connected to the conductor pattern for signal circuits, and A bypass conductor pattern is connected to the wall of the load cell.

またこの発明は、増幅器を金属体のシールドケースで包
囲し、そのシールドケースを電波のバイパス用導体パタ
ーンに接続したものである。
Further, in the present invention, the amplifier is surrounded by a metal shield case, and the shield case is connected to a conductor pattern for bypassing radio waves.

またこの発明は、増幅器をIC化された演算増幅器で構
成し、その増幅器の各端子に貫通形・セラミックコンデ
ンサを装石し、その各コンデンサの一ノjの電極を電波
のバイパス用導体パターンに接続したものである。
In addition, this invention configures the amplifier with an operational amplifier integrated into an IC, has a through-type ceramic capacitor installed at each terminal of the amplifier, and connects one electrode of each capacitor to a conductor pattern for bypassing radio waves. It is connected.

さらにこの発明は、ロードセルからの信号線にフィルタ
回路を介挿し、そのフィルタ回路のバイパス電極を電波
のバイパス用導体パターンに接続したものである。
Further, in the present invention, a filter circuit is inserted into the signal line from the load cell, and a bypass electrode of the filter circuit is connected to a conductor pattern for bypassing radio waves.

[作用] このような構成の本発明においては外部から電波が入込
むと内部のリード線やロードセルに高周波電圧が誘起さ
れ、プリント配線板を介して増幅器に印加しようとする
。しかしこのとき一対の信号回路用導体パターンとその
間の電波のバイパス用導体パターンとの間に分布容量が
形成され高周波電圧がバイパス−用導体パターンにバイ
パスされて減衰し、増幅器への高周波電圧の印加を弱め
る。
[Function] In the present invention having such a configuration, when a radio wave enters from the outside, a high frequency voltage is induced in the internal lead wire or load cell, and is applied to the amplifier via the printed wiring board. However, at this time, a distributed capacitance is formed between the pair of signal circuit conductor patterns and the radio wave bypass conductor pattern between them, and the high frequency voltage is bypassed and attenuated by the bypass conductor pattern, and the high frequency voltage is not applied to the amplifier. weaken.

またこの発明では増幅器を金属体のシールドケースで包
囲しそのケースを電波のバイパス用導体パターンに接続
することにより、増幅器に直接誘起される高周波電圧を
弱め、また高周波電圧を信号回路用導体パターンに影響
を与えることなくバイパス用導体パターンにバイパスで
きるのでよりその高周波電圧の影響を弱めることができ
る。
In addition, in this invention, the amplifier is surrounded by a metal shield case and the case is connected to the radio wave bypass conductor pattern, thereby weakening the high frequency voltage directly induced in the amplifier, and also directing the high frequency voltage to the signal circuit conductor pattern. Since it can be bypassed to the bypass conductor pattern without any influence, the influence of the high frequency voltage can be further weakened.

またこの発明では誘起された高周波電圧がセラミックコ
ンデンサを介してバイパス用導体パターンにバイパスさ
れるのでこのものにおいてもよりその高周波電圧の影響
を弱めることができる。
Further, in this invention, the induced high frequency voltage is bypassed to the bypass conductor pattern via the ceramic capacitor, so that the influence of the high frequency voltage can be further weakened.

さらにこの発明ではロードセルの信号線に誘起された高
周波電圧をフィルタ回路によってバイパスしているので
より高周波電圧の影響を弱めることができる。
Furthermore, in this invention, the high frequency voltage induced in the signal line of the load cell is bypassed by the filter circuit, so that the influence of the high frequency voltage can be further weakened.

[実施例] 以ド、この発明の一実施例を図面を参照して説明する。[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

第1図及び第2図に示すようにベース板1−の上にロー
ドセル2の一端側下部を固定している。前記ロードセル
2の他端側」二部には荷重受は機構3かねじ4によって
固定され、その荷重受は機構3のにに荷重受は皿5が′
載置されている。
As shown in FIGS. 1 and 2, a lower portion of one end of a load cell 2 is fixed onto a base plate 1-. A load receiver is fixed to the other end of the load cell 2 by a mechanism 3 or a screw 4;
It is placed.

前記ねじ4は前記荷重受は機構3とはスペーサ6.7に
よって絶縁され、ロードセル2に螺着されている。
The screw 4 is insulated from the load receiver mechanism 3 by a spacer 6.7, and is screwed onto the load cell 2.

また、前記ベース板1上には3枚のプリント配線板8,
9.10が積層され、−格上と一番下のプリント配線板
8,10には信号回路用導体パターンが形成され、また
中間のプリント配線板9には1・6波のバイパス用の導
体パターンが形成されている。前記各プリント配線板8
.10の信号回路用・9体パターンと前記プリント配線
板9のバイパス用導体パターンとは絶縁されている。
Further, on the base board 1, there are three printed wiring boards 8,
9 and 10 are stacked, and conductor patterns for signal circuits are formed on the upper and lower printed wiring boards 8 and 10, and conductors for bypassing waves 1 and 6 are formed on the intermediate printed wiring board 9. A pattern is formed. Each printed wiring board 8
.. The 9 signal circuit patterns 10 and the bypass conductor pattern of the printed wiring board 9 are insulated.

前記プリント配線板9のバイパス用導体パターンはリー
ド線11を介して前記ロードセル2の壁面、例えば起歪
体2aに接続されている。
The bypass conductor pattern of the printed wiring board 9 is connected to the wall surface of the load cell 2, for example, the strain body 2a, via a lead wire 11.

前記−格上のプリント配線板8には前記ロードセル2か
らの電圧信号を増幅するIC化された演算増幅器12が
固定されている。前記演算増幅器12はその周囲をさら
に金属体のシールドケース13によって包囲されている
。前記シールドケース13はプリント配線板8の導体パ
ターンとは絶縁され、中間のプリント配線板9のバイパ
ス用導体パターンに接続されている。
An operational amplifier 12 configured as an IC for amplifying the voltage signal from the load cell 2 is fixed on the printed wiring board 8 above the - level. The operational amplifier 12 is further surrounded by a metal shield case 13. The shield case 13 is insulated from the conductor pattern of the printed wiring board 8 and connected to the bypass conductor pattern of the intermediate printed wiring board 9.

さらに第3図に示すように前記ロードセル2から前記演
算増幅器12の端子に接続される信号線14.15及び
前記ロードセル2からのその他の信号線16.17の途
中には1個のコイルと2個のコンデンサからなるフィル
タ回路18,19゜20.21がそれぞれ介挿されてい
る。そして前記各フィルタ回路18〜21のバイパス電
極を前記プリント配線板9のバイパス用導体パターンに
接続している。
Furthermore, as shown in FIG. Filter circuits 18, 19, 20, and 21 each consisting of a capacitor are inserted. The bypass electrodes of each of the filter circuits 18 to 21 are connected to the bypass conductor pattern of the printed wiring board 9.

このような構成の本発明実施例においては外部から電波
を受けると内部のリード線やロードセル2の特に起歪体
2aに高周波電圧が誘起される。
In the embodiment of the present invention having such a configuration, when a radio wave is received from the outside, a high frequency voltage is induced in the internal lead wires and especially in the strain body 2a of the load cell 2.

この高周波電圧はプリント配線板8の導体パターンを介
して演算増幅器12に印加される。しかしこのときプリ
ント配線板8,10とプリント配線板9の導体パターン
との間には分布容量が形成され、演算増幅器12に印加
される高周波電圧がバイパス用導体パターンにバイパス
される。しかして、演算増幅器12に印加される高周波
電圧はかなり減衰し弱められる。また起歪体2aは荷重
受は機hllS3が取付けられるため秤の中で最大の表
面積をaすることになり、誘起される高周波電圧も最大
となるがその起歪体2aをバイパス用導体パターンに接
続しているので、高周波電圧の減衰作用は最大となり、
電波による影響を極力弱めることかできる。
This high frequency voltage is applied to the operational amplifier 12 via the conductor pattern of the printed wiring board 8. However, at this time, a distributed capacitance is formed between the printed wiring boards 8, 10 and the conductor pattern of the printed wiring board 9, and the high frequency voltage applied to the operational amplifier 12 is bypassed to the bypass conductor pattern. Thus, the high frequency voltage applied to operational amplifier 12 is considerably attenuated and weakened. In addition, since the load receiver is attached to the flexure element 2a, the machine hllS3 has the largest surface area in the scale, and the induced high-frequency voltage is also the largest. Because it is connected, the attenuation effect of high frequency voltage is maximum,
It is possible to weaken the influence of radio waves as much as possible.

また演算増幅器12は金属体のシールドケース13によ
っても包囲されているので、外部から演算増幅器12に
直接到達する電波を町止し、それによって演算増幅器1
2で誘起される高周波電圧を低下させ、演算増幅器12
に対する高周波電圧の悪影響をさらに弱めることができ
る。しかも、シールドケース13は中間のプリント配線
板9のバイパス用導体パターンに接続されているので、
シールドケース13に誘起される高周波電圧はプリント
配線板の信号回路用導体パターンに影響を与えることな
くバイパスされることになる。従ってこれによっても高
周波電圧の演算増幅器12に与える影響を弱めることが
できる。
In addition, since the operational amplifier 12 is also surrounded by a metal shield case 13, radio waves that directly reach the operational amplifier 12 from the outside are blocked, thereby blocking the operational amplifier 1.
The operational amplifier 12 reduces the high frequency voltage induced in the operational amplifier 12.
It is possible to further weaken the negative influence of high frequency voltage on Moreover, since the shield case 13 is connected to the bypass conductor pattern of the intermediate printed wiring board 9,
The high frequency voltage induced in the shield case 13 is bypassed without affecting the signal circuit conductor pattern of the printed wiring board. Therefore, this also makes it possible to weaken the influence of the high frequency voltage on the operational amplifier 12.

さらに、ロードセル2に大きな高周波電圧が誘起される
ことからロードセル2からの信号線14〜17にも大き
な高周波電圧が誘起される。しかしこの高周波電圧はフ
ィルタ回路18〜21によってバイパス用導体パターン
にバイパスされるのでこれによっても演算増幅器12に
印加される高周波電圧を充分に減、衰させることができ
る。
Furthermore, since a large high frequency voltage is induced in the load cell 2, a large high frequency voltage is also induced in the signal lines 14 to 17 from the load cell 2. However, since this high frequency voltage is bypassed to the bypass conductor pattern by the filter circuits 18 to 21, the high frequency voltage applied to the operational amplifier 12 can be sufficiently attenuated and attenuated.

さらにまた、2枚の信号回路用導体パターンを形成した
プリント配線板Ill、10を間にバイパス用導体パタ
ーンを形成したプリント配線板9を介して積層している
ので、信号回路用導体パターンとバイパス用導体パター
ンとの対向する長さが短くてすみ、これにより高周波に
よる共振作用を極力防止することができこの点において
も誤動作防上の対策を講じることができる。
Furthermore, since the two printed wiring boards Ill and 10 on which the signal circuit conductor pattern is formed are laminated with the printed wiring board 9 on which the bypass conductor pattern is formed in between, the signal circuit conductor pattern and the bypass The length facing the conductor pattern for use can be shortened, thereby making it possible to prevent resonance effects due to high frequencies as much as possible, and in this respect as well, measures can be taken to prevent malfunctions.

このように電波を受けることによって内部に誘起される
高周波電圧が演算増幅器12に印加するのを最大限防止
しているので、電波の影響によって演算増幅器12が誤
動作する虞れはなく、常に正確な計量動作ができる。
In this way, the high-frequency voltage induced internally by receiving radio waves is prevented from being applied to the operational amplifier 12 to the maximum extent possible, so there is no risk that the operational amplifier 12 will malfunction due to the influence of radio waves, and it will always be accurate. Can perform weighing operations.

次にこの発明の他の実施例を図面を参照して説明する。Next, another embodiment of the invention will be described with reference to the drawings.

なお、この実施例は演算増幅器12のプリント配線板に
対する固定部について述べその他は省略する。
Note that in this embodiment, only a portion of the operational amplifier 12 fixed to the printed wiring board will be described, and other details will be omitted.

第4図及び第5図に示すように演算増幅器12の各端子
12a、12a、・・・に貫通形のセラミックコンデン
サ31,31.・・・を装着している。前記演算増幅器
12の各端子12a、12a、・・・は前記セラミック
コンデンサ31,31.・・・の中央部を貫通して一番
下のプリント配線板10の信号回路用導体パターンに接
続している。前記セラミックコンデンサ31は外側に設
けられた一方の電極32を前記中間のプリント配線板9
のバイパス用導体パターンに接続している。
As shown in FIGS. 4 and 5, through-type ceramic capacitors 31, 31 . I am wearing... Each terminal 12a, 12a, . . . of the operational amplifier 12 is connected to the ceramic capacitor 31, 31 . ... and is connected to the signal circuit conductor pattern of the lowermost printed wiring board 10. The ceramic capacitor 31 has one electrode 32 provided on the outside connected to the intermediate printed wiring board 9.
Connected to the bypass conductor pattern.

このような(11〜成であれば誘起された高周波′小月
4が演や増幅a:: 12の各端子からセラミックコン
デンサ31を介してプリント配線板9のバイパス用導体
パターンにバイパスされるので、このようにしてもプリ
ント配線板8,10の導体パターンに高周波電圧の影響
を与えることなく演算増幅器12に印加される高周波電
圧を減衰させることができる。しかもシールドケースに
比べて取付は面積は少なくてすむ。
If such (11 to 11) are formed, the induced high frequency wave 4 is bypassed from each terminal of the output and amplification a:: 12 to the bypass conductor pattern of the printed wiring board 9 via the ceramic capacitor 31. Even in this way, the high frequency voltage applied to the operational amplifier 12 can be attenuated without affecting the conductor patterns of the printed wiring boards 8 and 10.Moreover, the installation area is smaller than that of a shield case. Less is needed.

[発明の効果] 以−ト詳述したようにこの発明によれば、電波の影響を
極力防止でき、電波障害による誤動作を防止できるロー
ドセル式秤を提供できるものである。
[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a load cell scale that can prevent the influence of radio waves as much as possible and prevent malfunctions due to radio wave interference.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図〜第3図はこの発明の一実施例を示すもので、第
1図はロードセル取付は部の側面図、第2図はベース板
に対するロードセルとプリント配線板の取付は状態を示
す斜視図、第3図はロードセルと演算増幅器とのブロッ
クを含む部分回路図、第4図及び第5図はこの発明の他
の実施例を示すもので、第4図は演算増幅器の斜視図、
第5図は演算増幅器をプリント配線板に取付けた状態を
示す断面図である。 2・・・ロードセル、8,10・・・信号回路用導体パ
ターンを形成したプリント配線板、9・・・電波のバイ
パス用導体パターンを形成したプリント配線板、12・
・・演算増幅器、13・・・金属体のシールドケース、
18,19,20.21・・・フィルタ回路、31・・
・貫通形のセラミ7クコンデンサ。 出願人代理人 弁理士 鈴江武彦 第1図 第2図
Figures 1 to 3 show one embodiment of the present invention. Figure 1 is a side view of the load cell mounting section, and Figure 2 is a perspective view showing the mounting state of the load cell and printed wiring board to the base plate. 3 is a partial circuit diagram including blocks of a load cell and an operational amplifier, FIGS. 4 and 5 show other embodiments of the present invention, and FIG. 4 is a perspective view of the operational amplifier.
FIG. 5 is a sectional view showing a state in which the operational amplifier is attached to a printed wiring board. 2... Load cell, 8, 10... Printed wiring board on which a signal circuit conductor pattern was formed, 9... Printed wiring board on which a radio wave bypass conductor pattern was formed, 12.
...Operation amplifier, 13...Metal shield case,
18, 19, 20.21...filter circuit, 31...
・Through-type ceramic 7 capacitor. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (4)

【特許請求の範囲】[Claims] (1)荷重に応じた電圧信号を出力するロードセルを有
し、そのロードセル出力を増幅器で増幅して荷重信号を
得るようにしたロードセル式秤において、信号回路用導
体パターンを形成した一対のプリント配線板の間に電波
のバイパス用導体パターンを形成したプリント配線板を
挟んで3層構造とし、その内の信号回路用導体パターン
に前記増幅器を接続し、かつ電波のバイパス用導体パタ
ーンを前記ロードセルの壁面に接続したことを特徴とす
るロードセル式秤。
(1) In a load cell type scale that has a load cell that outputs a voltage signal according to the load, and the output of the load cell is amplified by an amplifier to obtain the load signal, a pair of printed wiring formed with a signal circuit conductor pattern is used. A printed wiring board on which a conductor pattern for bypassing radio waves is formed is sandwiched between the boards to form a three-layer structure, the amplifier is connected to the conductor pattern for the signal circuit among the boards, and the conductor pattern for bypassing radio waves is attached to the wall surface of the load cell. A load cell type scale characterized by being connected.
(2)荷重に応じた電圧信号を出力するロードセルを有
し、そのロードセル出力を増幅器で増幅して荷重信号を
得るようにしたロードセル式秤において、信号回路用導
体パターンを形成した一対のプリント配線板の間に電波
のバイパス用導体パターンを形成したプリント配線板を
挟んで3層構造とし、その内の信号回路用導体パターン
に前記増幅器を接続し、かつ電波のバイパス用導体パタ
ーンを前記ロードセルの壁面に接続し、さらに前記増幅
器を金属体のシールドケースで包囲し、そのシールドケ
ースを前記電波のバイパス用導体パターンに接続したこ
とを特徴とするロードセル式秤。
(2) In a load cell type scale that has a load cell that outputs a voltage signal according to the load, and the output of the load cell is amplified by an amplifier to obtain the load signal, a pair of printed wiring formed with a signal circuit conductor pattern is used. A printed wiring board on which a conductor pattern for bypassing radio waves is formed is sandwiched between the boards to form a three-layer structure, the amplifier is connected to the conductor pattern for the signal circuit among the boards, and the conductor pattern for bypassing radio waves is attached to the wall surface of the load cell. A load cell type weigher, further comprising: connecting the amplifier with a metal shield case, and connecting the shield case to the radio wave bypass conductor pattern.
(3)荷重に応じた電圧信号を出力するロードセルを有
し、そのロードセル出力をIC化された演算増幅器で増
幅して荷重信号を得るようにしたロードセル式秤におい
て、信号回路用導体パターンを形成した一対のプリント
配線板の間に電波のバイパス用導体パターンを形成した
プリント配線板を挟んで3層構造とし、その内の信号回
路用導体パターンに前記演算増幅器を接続し、かつ電波
のバイパス用導体パターンを前記ロードセルの壁面に接
続し、さらに前記演算増幅器の各端子に貫通形セラミッ
クコンデンサを装着し、その各コンデンサの一方の電極
を前記電波のバイパス用導体パターンに接続したことを
特徴とするロードセル式秤。
(3) Forming a conductor pattern for a signal circuit in a load cell scale that has a load cell that outputs a voltage signal according to the load, and the load cell output is amplified by an IC-based operational amplifier to obtain the load signal. A three-layer structure is formed by sandwiching a printed wiring board on which a conductor pattern for bypassing radio waves is formed between a pair of printed wiring boards, and the operational amplifier is connected to the conductor pattern for a signal circuit among the boards, and the conductor pattern for bypassing radio waves is connected to the operational amplifier. is connected to the wall surface of the load cell, a feedthrough ceramic capacitor is attached to each terminal of the operational amplifier, and one electrode of each capacitor is connected to the radio wave bypass conductor pattern. Scales.
(4)荷重に応じた電圧信号を出力するロードセルを有
し、そのロードセル出力を増幅器で増幅して荷重信号を
得るようにしたロードセル式秤において、信号回路用導
体パターンを形成した一対のプリント配線板の間に電波
のバイパス用導体パターンを形成したプリント配線板を
挟んで3層構造とし、その内の信号回路用導体パターン
に前記増幅器を接続し、かつ電波のバイパス用導体パタ
ーンを前記ロードセルの壁面に接続し、さらに前記ロー
ドセルからの信号線にフィルタ回路を介挿し、そのフィ
ルタ回路のバイパス電極を前記電波のバイパス用導体パ
ターンに接続したことを特徴とするロードセル式秤。
(4) In a load cell type scale that has a load cell that outputs a voltage signal according to the load, and the output of the load cell is amplified by an amplifier to obtain the load signal, a pair of printed wiring formed with a conductor pattern for a signal circuit is used. A printed wiring board on which a conductor pattern for bypassing radio waves is formed is sandwiched between the boards to form a three-layer structure, the amplifier is connected to the conductor pattern for the signal circuit among the boards, and the conductor pattern for bypassing radio waves is attached to the wall surface of the load cell. A load cell type weigher, further comprising a filter circuit inserted in the signal line from the load cell, and a bypass electrode of the filter circuit connected to the radio wave bypass conductor pattern.
JP19863885A 1985-09-10 1985-09-10 Load cell type scale Pending JPS6259817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19863885A JPS6259817A (en) 1985-09-10 1985-09-10 Load cell type scale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19863885A JPS6259817A (en) 1985-09-10 1985-09-10 Load cell type scale

Publications (1)

Publication Number Publication Date
JPS6259817A true JPS6259817A (en) 1987-03-16

Family

ID=16394535

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19863885A Pending JPS6259817A (en) 1985-09-10 1985-09-10 Load cell type scale

Country Status (1)

Country Link
JP (1) JPS6259817A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55140113A (en) * 1979-04-19 1980-11-01 Tokyo Electric Co Ltd Weighing device employing load cell
JPS58132621A (en) * 1982-02-03 1983-08-08 Tokyo Electric Co Ltd Load cell balance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55140113A (en) * 1979-04-19 1980-11-01 Tokyo Electric Co Ltd Weighing device employing load cell
JPS58132621A (en) * 1982-02-03 1983-08-08 Tokyo Electric Co Ltd Load cell balance

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