JP5317747B2 - Electronic scale with static elimination function - Google Patents

Electronic scale with static elimination function Download PDF

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JP5317747B2
JP5317747B2 JP2009032533A JP2009032533A JP5317747B2 JP 5317747 B2 JP5317747 B2 JP 5317747B2 JP 2009032533 A JP2009032533 A JP 2009032533A JP 2009032533 A JP2009032533 A JP 2009032533A JP 5317747 B2 JP5317747 B2 JP 5317747B2
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electronic balance
static elimination
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JP2010190600A (en
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直人 出雲
久則 織田
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A&D Co Ltd
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  • Elimination Of Static Electricity (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus which neutralizes a sample on which static electricity is built up effectively and surely by an electronic scale without using another apparatus. <P>SOLUTION: The electronic scale includes a weighing space 5 and a mechanical chamber 3 behind the weighing space. The weighing space 5 is divided into an upper neutralization chamber 6 and a lower weighing chamber 7 by a partition 4. Positive or negative neutralization needles 11A to 11D are alternately arranged on the back wall 6A of the neutralization chamber 6. A neutralizer 12 for applying voltage to the neutralization needles 11A to 11D is arranged in the mechanical chamber 3 behind the back wall 6A. In order to neutralize the sample, the neutralization chamber 6 is filled with ions by the neutralization needles, and the static electricity build up on the sample is neutralized through the ions. When the neutralization is done, the sample is mounted on a weighing tray 2 in the lower weighing chamber 7 to weigh the sample without being affected by the static electricity. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は電子秤に係り、特に除電機能を有する電子秤に関する。   The present invention relates to an electronic balance, and more particularly to an electronic balance having a charge removal function.

電子秤、特に電磁平衡式の所謂電子天秤は、例えば１００万分の１ｇ（１μｇ）までの極めて微量な質量の計測が可能となっているが、反面例えば気圧変化、湿度変化等従来では無視されていた環境要素が計量時の誤差要因として問題となっている。   An electronic balance, particularly an electromagnetic balance type so-called electronic balance, can measure a very small amount of mass up to, for example, 1 g per million (1 μg). Environmental factors have become a problem as an error factor during weighing.

このような誤差要因の一つとして静電気の影響がある。例えば冬場の太平洋側地域のような低湿度の環境、或いはウイルスや細菌等の繁殖を抑える環境を維持するため湿度０パーセントに設定されているクリーンルーム等、静電気が発生し易い環境下においては計量対象物の帯電により数１０ｍｇの計量誤差が発生することがある。   One such error factor is the influence of static electricity. For example, in a low-humidity environment such as the Pacific region in winter, or in an environment where static electricity is likely to occur, such as a clean room where the humidity is set to 0% to maintain an environment that suppresses the growth of viruses and bacteria. A weighing error of several tens of mg may occur due to charging of an object.

冬場において１０ＫＶ程度に帯電した状態でドアのノブを触った時に電撃を受けたりすることによって、静電気を意識することは我々が日常体験することであるが、反面１００Ｖ程度の微小な帯電では気づかないことが多い。しかし、微量な質量の計測が可能な電子天秤を始めとする高分解能の電子秤の場合には、計測対象物である試料そのものが帯電していると、試料と周囲の金属或いは絶縁物とも静電誘導による浮遊電荷が相手面に発生し、当該試料と計量皿周辺機器との間に静電誘導によるクーロン力が発生し、このため計量値は試料の本来の質量に対して大きな誤差を含んだものとなる。電子天秤は試料の質量×重力加速度に平衡する電気量に変換して当該試料の重量を計測するため、質量に対して重力加速度以外の力が加わると平衡する電気量も変化し、結局加わった力がそのまま誤差として測定されてしまう。   It is a daily experience that we are aware of static electricity by being shocked when touching the door knob in a state of being charged to about 10 KV in winter, but on the other hand we are not aware of a minute charge of about 100 V. There are many cases. However, in the case of a high-resolution electronic balance such as an electronic balance capable of measuring a small amount of mass, if the sample itself as a measurement object is charged, both the sample and the surrounding metal or insulator are static. Floating charges due to electrical induction are generated on the mating surface, and a Coulomb force is generated between the sample and the weighing pan peripheral device due to electrostatic induction. Therefore, the measured value includes a large error with respect to the original mass of the sample. It will be. Since the electronic balance measures the weight of the sample by converting it to the amount of electricity that balances the mass of the sample × gravity acceleration, the amount of electricity that balances changes when a force other than gravity acceleration is applied to the mass, and eventually added The force is directly measured as an error.

上記のような観点から、現在までに静電気の影響を避けるために以下のような対策が実施されている。
（ａ）イオナイザーと称されるイオン発生器を用いて帯電した試料にイオン風を当てて、帯電した試料の電荷と逆の電荷（イオン）を吸着させることにより電荷の中和を行なう方法。
（ｂ）Ｘ線の除電効果を利用し、帯電している試料に対してＸ線を照射して電荷（イオン）を中和する方法。
（ｃ）帯電した試料及び電子天秤を構成する部材に対して除電効果のある液体（帯電防止剤）を吹き付ける方法。
（ｄ）帯電した試料を金属等で被い、試料表面の電荷から発生する電気力線を遮断する方法。
（ｅ）加湿器等を利用して空気中の湿度を上昇させ、自然放電を促進させる方法。 From the above viewpoint, the following measures have been implemented so far to avoid the influence of static electricity.
(A) A method of neutralizing charges by applying ion wind to a charged sample using an ion generator called an ionizer and adsorbing charges (ions) opposite to those of the charged sample.
(B) A method of neutralizing charges (ions) by irradiating a charged sample with X-rays by utilizing the X-ray neutralization effect.
(C) A method of spraying a liquid (antistatic agent) having a charge eliminating effect on a charged sample and members constituting the electronic balance.
(D) A method in which a charged sample is covered with a metal or the like and electric lines of force generated from the charge on the sample surface are blocked.
(E) A method of increasing the humidity in the air using a humidifier or the like to promote natural discharge.

上記（ａ）乃至（ｅ）の方法は何れも試料の計測前に除電のために別の作業を必要とし、手間がかかると共に、気化熱による温度変化、風の影響、試料の吸湿による質量の変化等により除電作業自体が計測誤差を招来する可能性もある。より具体的には（ａ）、（ｂ）の方法は別の装置を用いて予め除電する必要があり、また（ｃ）の方法は帯電防止剤を噴霧すること自体が試料の質量を変化させたり、液体の気化による気化熱に起因して発生する対流による計量誤差等を発生させてしまうおそれがある。また（ｄ）の方法は試料を被う金属の重量を予め計測し、この計測値を風袋引きする操作をする必要がある等何れの方法も問題がある。   Any of the above methods (a) to (e) requires a separate operation for charge removal before measurement of the sample, which is time-consuming and takes time, changes in temperature due to heat of vaporization, influence of wind, and mass of the sample due to moisture absorption. There is a possibility that the static elimination work itself causes a measurement error due to a change or the like. More specifically, in the methods (a) and (b), it is necessary to remove static electricity in advance using another device. In the method (c), spraying the antistatic agent itself changes the mass of the sample. Or a measurement error due to convection caused by the heat of vaporization caused by the vaporization of the liquid may occur. Further, the method (d) has a problem in that it is necessary to measure the weight of the metal covering the sample in advance and to tare the measured value.

上記のような点に鑑み、静電気除去（中和）手段を電子秤（電子天秤）と一体化し、或いはこの電子天秤に内蔵する構成が以下のとおり提案されている。
特開２００１−１６５７６０ 特開２００７−１９９０６１ In view of the above points, a configuration in which static elimination (neutralization) means is integrated with an electronic balance (electronic balance) or built in the electronic balance has been proposed as follows.
JP 2001-165760 A JP2007-199061A

上記特許文献の構成とすることにより、試料の電荷を中和（以下「除電」と称する）ために特別の装置を設置したり、除電用の素材を用いたりする必要が無くなった。
このうち特許文献１の発明は、いわば（ａ）の方法を実施する手段を電子天秤に組み込んだ構成であると言える。即ち、ベンチレータを用いてイオン化された空気流を計量皿上の試料に吹き付けて試料を除電する構成となっている。この構成は試料の除電には有効であるが、計量皿に対して空気流が当たるため、計量皿がこの空気流に煽られてしまい計量値が安定しなくなる虞がある。また試料の多くは粉体であるが、粉体である試料の一部がこの空気流により飛散するという問題もある。 By adopting the configuration of the above-mentioned patent document, it is no longer necessary to install a special device or use a material for charge removal in order to neutralize the charge of the sample (hereinafter referred to as “charge removal”).
Among these, it can be said that the invention of Patent Document 1 has a configuration in which means for carrying out the method (a) is incorporated in an electronic balance. That is, the sample is neutralized by spraying an ionized air flow using a ventilator onto the sample on the weighing pan. This configuration is effective for removing the charge from the sample, but since the airflow is applied to the weighing pan, the weighing pan may be swept by the airflow and the measurement value may not be stable. Many of the samples are powders, but there is also a problem that some of the samples that are powders are scattered by the air flow.

特許文献２の構成は、電子天秤のスライド式のサイドドア（以下本発明の実施例も含めて単に「サイドドア」とする）手前或いは秤量室側にイオン発生源を配置し、秤量室に試料を入れる一連の作業の間に当該試料がイオン発生源を通過することにより試料の除電が行なえるよう構成されている。しかしその構成上イオン発生源である針は計量作業操作面を向いてるため手が触れると電撃が発生して危険である。また、計量室内に試料を搬入する行程で除電するため除電が不十分になる場合が生じる。更に試料が細長い絶縁物であると、開放空間で除電をせざる得なくなり、試料全体を除電することができない可能性もある。   The configuration of Patent Document 2 is that an ion generation source is arranged in front of the sliding side door of the electronic balance (hereinafter simply referred to as “side door” including the embodiments of the present invention) or the weighing chamber side, and the sample is placed in the weighing chamber. The sample is neutralized by passing the sample through the ion generation source during a series of operations. However, the needle, which is an ion generation source, faces the measuring work operation surface because of its construction, and it is dangerous to generate an electric shock when touched by a hand. Moreover, since the charge is removed in the process of loading the sample into the measurement chamber, the charge removal may be insufficient. Furthermore, if the sample is an elongated insulator, there is a possibility that the charge must be removed in an open space, and the entire sample may not be removed.

本発明は上記特許文献記載の発明の利点を保持したまま、その問題点を解決するよう構成した除電機能を有する電子秤であることを特徴とする。
即ち、本発明は電子秤の秤量室を上下に区画し、上下空間の一方、例えば上部空間に除電用の放電手段を複数配置することにより当該上部空間を閉空間としての除電室（除電空間）として構成し、かつ下部空間を秤量空間（秤量室）として構成する電子秤であることを特徴とする。また要すれば除電室或いは除電室周辺に湿度センサを配置し、この湿度センサで検知した湿度に対応して自動的に除電手段を起動させたり、あるいは電子秤使用者に対して除電の要否を提示する手段を搭載した電子秤である。 The present invention is characterized in that it is an electronic balance having a charge eliminating function configured to solve the problems while maintaining the advantages of the invention described in the above patent document.
That is, according to the present invention, a weighing chamber of an electronic scale is divided into upper and lower parts, and a plurality of discharging means for discharging are disposed in one of the upper and lower spaces, for example, the upper space, so that the upper space becomes a closed space (discharge space). And an electronic balance having a lower space as a weighing space (weighing chamber). In addition, if necessary, a humidity sensor is arranged in or around the static elimination chamber, and the static elimination means is automatically activated in response to the humidity detected by the humidity sensor, or whether the electronic scale user needs to eliminate static electricity. It is an electronic balance equipped with means for presenting.

秤量室の上部に密閉空間として除電室が区画形成され、この除電室には静電気を中和するイオンが充満するため、除電室に入れた試料は確実に除電される。またイオン発生用の放電針は除電室の後壁に配置することにより試料の出し入れ時に手に触れる等の危険が生じない。   A static elimination chamber is formed as a sealed space in the upper part of the weighing chamber, and the static elimination chamber is filled with ions that neutralize static electricity, so that the sample placed in the static elimination chamber is reliably eliminated. In addition, the discharge needle for generating ions is arranged on the rear wall of the static elimination chamber, so that there is no danger of touching the hand when the sample is taken in and out.

除電手段としてとしては風の出ない直流電圧印加方式が好適であるが、除電室が秤量室と隔離されているため送風によるイオンの搬送が必要となる交流電圧印加方式も採用可能となる。   As the charge removal means, a direct current voltage application system that does not generate wind is suitable, but since the charge removal chamber is isolated from the weighing chamber, an alternating voltage application system that requires ion transport by air blowing can also be employed.

また、放電針は一定の使用時間経過により清掃、交換を行なう必要があるが、除電室を独立に構成しているため、放電針の設置方法に関する自由度が高く、清掃・交換の容易性を考慮した位置での放電針の設置が可能であり、従って放電針の交換・清掃等のメンテナンスを容易にすることが可能である。   In addition, the discharge needle needs to be cleaned and replaced after a certain period of use, but since the static elimination chamber is configured independently, there is a high degree of freedom regarding the installation method of the discharge needle, making it easy to clean and replace. It is possible to install the discharge needle at the position considered, and therefore it is possible to facilitate maintenance such as replacement and cleaning of the discharge needle.

更に、計量皿が配置される計量用空間は、一般的に大きな風袋に対して微小量を計測することが可能に構成されているため、微小量の試料のみを計測する場合には必要以上に計量用空間の体積が大きくなり、計量用空間に対する試料の出し入れの際に生じる攪乱された空気が安定するまでに時間がかる。このため気流安定化を促進するために計量用の空間を小さくした装置が提案されているが、本発明では除電室を設けることにより結果的に計量室を小型化することができ上記問題を解決することができる。   In addition, the weighing space in which the weighing pan is placed is generally configured to be able to measure a minute amount with respect to a large tare, so it is more than necessary when measuring only a minute amount of sample. The volume of the measuring space increases, and it takes time for the disturbed air generated when the sample is taken in and out of the measuring space to stabilize. For this reason, a device with a small space for measurement has been proposed in order to promote airflow stabilization. However, in the present invention, by providing a static elimination chamber, the measurement chamber can be reduced in size, thereby solving the above problem. can do.

以下本発明の実施例を図面を参考に具体的に説明する。
図１及び図２において、矢印１は電子秤の一種としての電磁平衡式の電子天秤を示す。この電子天秤の基本構成は、図１（Ａ）及び図２に示すように装置前部に計量皿２が配置された計量用空間５が形成され、かつ計量用空間５の後部には荷重伝達機構や電子回路が配置された機構室３が形成された構成となっいる。 Embodiments of the present invention will be specifically described below with reference to the drawings.
1 and 2, an arrow 1 indicates an electromagnetic balance type electronic balance as a kind of electronic balance. As shown in FIGS. 1A and 2, the basic structure of this electronic balance is that a weighing space 5 in which a weighing pan 2 is arranged is formed at the front of the apparatus, and a load is transmitted to the rear of the weighing space 5. A mechanism chamber 3 in which a mechanism and an electronic circuit are arranged is formed.

符号４は仕切板である。この仕切板４は上記電子天秤の基本構成において計量用空間５として形成される空間を上下に仕切るように配置され、これにより上部空間を後述するような構成の除電室６に、また下部空間を計量室７に区間形成する。なお仕切板４としては導電性を付加した板状部材、例えば透明ガラス等が好適である。   Reference numeral 4 denotes a partition plate. The partition plate 4 is arranged so as to partition the space formed as the measurement space 5 in the basic configuration of the electronic balance above and below, thereby removing the upper space in the static elimination chamber 6 configured as described later and the lower space. A section is formed in the measuring chamber 7. The partition plate 4 is preferably a plate-like member with added conductivity, such as transparent glass.

仕切板４は当該計量用空間５内に固定的に配置することも可能であるが、メンテナンスの利便性及びフラスコに入った試料等、大きな風袋の試料を計測する場合もあることを考慮すれば着脱式に構成することが望ましい。符号８ａ、８ｂは仕切板４取付用の梁材であり、図示の構成では計量用空間５のぼほ中間の高さでかつ計量用空間５を開閉するためのサイドドア１０ａ、１０ｂの近傍においてそれぞれ配置固定されている。仕切板４はその両端がこの梁材８ａ、８ｂに差し渡し配置され、かつビス９により梁材８ａ、８ｂに着脱可能に取り付けられることにより計量用空間５を上部の除電室６及び下部の計量室７に仕切ることになる。   The partition plate 4 can be fixedly arranged in the measuring space 5, but considering the convenience of maintenance and the measurement of a large tare sample such as a sample in a flask. It is desirable to make it detachable. Reference numerals 8a and 8b are beam members for attaching the partition plate 4. In the illustrated configuration, the beam 8 is at an intermediate height of the measuring space 5 and in the vicinity of the side doors 10a and 10b for opening and closing the measuring space 5. Each is fixed. The partition plate 4 is arranged so that both ends thereof are passed between the beam members 8a and 8b and are detachably attached to the beam members 8a and 8b by screws 9, so that the measuring space 5 is formed in the upper charge removing chamber 6 and the lower measuring chamber. It will be divided into seven.

次に除電室６の構成について説明する。
除電室の後壁６Ａに直流型イオン発生手段として複数（図示の構成では４個）の放電針が配置されている。例えば放電針１１Ａと、１１Ｄは（＋）、放電針１１Ｂと１１Ｃは（−）に設定することにより（＋）、（−）の放電針が上下左右に交互に配置された構成となっている。なお放電針の設置数は図示の４本に限るものではなく、より多数配置したり、或いは逆に除電空間は減少するものの、（＋）、（−）の２本の放電針を配置する構成も可能である。 Next, the configuration of the static elimination chamber 6 will be described.
A plurality of (four in the illustrated configuration) discharge needles are arranged as DC ion generating means on the rear wall 6A of the static elimination chamber. For example, the discharge needles 11A and 11D are set to (+), and the discharge needles 11B and 11C are set to (−), whereby the (+) and (−) discharge needles are alternately arranged vertically and horizontally. . Note that the number of discharge needles is not limited to the four shown in the figure, and a larger number of discharge needles or a structure in which two discharge needles (+) and (-) are arranged although the static elimination space is reduced. Is also possible.

各放電針１１Ａ乃至１１Ｄの背後には後壁６Ａを介して機構室３内に放電針にイオン発生用の高電圧を印加するための除電器１２が配置されている。なお、各放電針はそれぞれ着脱が可能に構成されている。より具体的には各放電針はホルダー内に収納されてホルダーと共にユニット化されており、このユニットを特別な工具を用いることなく放電針を簡単かつ安全に着脱できるようになっており、放電針の清掃或いは交換を安全かつ容易に実施できるよう構成されている。例えば図２の符号１１Ｄで示されるように、除電針の周囲にホルダーとして機能するよう構成されたリング状の防護部材が配置されて全体がユニット化されている。 Behind each of the discharge needles 11A to 11D, a static eliminator 12 for applying a high voltage for ion generation to the discharge needle is disposed in the mechanism chamber 3 via the rear wall 6A. Each discharge needle is configured to be detachable. More specifically, each discharge needle is housed in a holder and unitized with the holder, and this unit can be easily and safely attached and detached without using a special tool. It is configured so that cleaning or replacement can be performed safely and easily. For example, as indicated by reference numeral 11D in FIG. 2, a ring-shaped protective member configured to function as a holder is disposed around the static elimination needle to form a unit.

次に計量室７は上述のように仕切板４を介して除電室６の下部に位置している。符号１３は計量皿２に載置された試料の重量を計測するために電磁部に荷重を伝達する荷重伝達機構、電気・電子基板を含む荷重計測機構である。   Next, the measurement chamber 7 is positioned below the static elimination chamber 6 through the partition plate 4 as described above. Reference numeral 13 denotes a load transmission mechanism that transmits a load to the electromagnetic unit in order to measure the weight of the sample placed on the weighing pan 2, and a load measurement mechanism that includes an electric / electronic board.

符号Ｓ１、Ｓ２、Ｓ３は湿度センサであって、Ｓ１は除電室６内に配置したものを、Ｓ２は計量室７内に配置したものを、Ｓ３は計量室の外部に配置したものを示すが、これら全てのセンサを設置する趣旨ではなく、必要度に応じて適宜の位置に設置すればよい。なお図示しないが、各湿度センサにより計測された湿度を例えば表示部１４に表示するよう構成する。   Reference numerals S1, S2, and S3 are humidity sensors, S1 indicates a sensor disposed in the static elimination chamber 6, S2 indicates a sensor disposed in the measuring chamber 7, and S3 indicates a sensor disposed outside the measuring chamber. It is not intended that all these sensors be installed, but may be installed at appropriate positions according to necessity. Although not shown, the humidity measured by each humidity sensor is displayed on the display unit 14, for example.

次に上記構成の電子天秤の使用状態について説明する。
先ず試料の計測に先立って、例えば湿度センサにより測定された湿度を単に数値として示すだけでなく、計測値に対応して計測者に除電の要否を知らせるよう構成しておくことが望ましい。例えば表示部に検知した湿度に対応して除電の要否を表示する。表示方法は各種考えられるが例えば除電の必要性が高い湿度４０％以下の場合には湿度の数字を赤で表示し、４０％から８０％の間で、念の為除電した方が良い場合には湿度の数字を黄色で示し、８０％以上で除電の必要がない場合は湿度の数字を青で示す等である。 Next, the usage state of the electronic balance having the above-described configuration will be described.
First, prior to the measurement of the sample, it is desirable that the humidity measured by the humidity sensor, for example, is not only indicated as a numerical value, but the measurement person is informed of the necessity of static elimination corresponding to the measured value. For example, the necessity of static elimination is displayed on the display unit corresponding to the detected humidity. Various display methods can be considered. For example, when the humidity is 40% or less where the need for static elimination is high, the humidity number is displayed in red, and if it is better to eliminate the charge between 40% and 80% just in case. Indicates the humidity number in yellow, and when it is 80% or more and there is no need for static elimination, the humidity number is indicated in blue.

以上の構成において、試料の除電が必要と判断された場合については、サイドドア１０ａ或いは１０ｂを開け、試料を先ず除電室６内に配置する。この場合除電手段が図示の直流型である場合には送風手段を必要としないが、除電可能なエリアは（＋）針、（−）針のコロナ放電が重複する部分に限られる。   In the above configuration, when it is determined that the sample needs to be neutralized, the side door 10a or 10b is opened, and the sample is first placed in the neutralization chamber 6. In this case, when the static elimination means is the DC type shown in the figure, the blowing means is not required, but the area where static elimination is possible is limited to the portion where the corona discharges of the (+) needle and the (-) needle overlap.

図３（Ａ）、（Ｂ）、（Ｃ）は放電針によるコロナ放電と除電可能な範囲を模式的に示している。なお、この場合放電針１１Ａ、１１Ｄが（＋）、放電針１１Ｂ、１１Ｃを（−）に設定した状態で以下説明する。   FIGS. 3A, 3B, and 3C schematically show the corona discharge by the discharge needle and the range that can be neutralized. In this case, the following description will be made with the discharge needles 11A and 11D set to (+) and the discharge needles 11B and 11C set to (−).

（Ａ）は４個の放電針の配置を上部から見た図であり、かつ（Ｂ）は側部から見た図である。直流型である場合には両放電針のコロナ放電が重複するエリア（斜線で示した部分）のみで除電可能であり、重複しないエリア（斜線を付していないエリア）では放射されたイオンにより逆に帯電してしまう。このような観点から図示の構成のように４本の放電針１１Ａ乃至１１Ｄを配置することにより除電室６全体において除電可能な範囲は、同図（Ｃ）の如く各放電針１１Ａ、１１Ｂ、１１Ｃ、１１Ｄによりコーン状に形成されるコロナ放電エリアの重複部分が除電可能エリアとなり、広い空間で除電が可能となる。また（＋）空間と（−）空間とが上下左右に交互に位置することは上記の効果の外、除電室６内でのイオンバランスの改善、つまり帯電電圧を低減することも可能となる。   (A) is the figure which looked at arrangement | positioning of four discharge needles from the upper part, and (B) is the figure seen from the side part. In the case of the direct current type, it is possible to remove static electricity only in the area where the corona discharge of both discharge needles overlaps (indicated by the hatched area), and in the non-overlapping area (area not indicated by the hatched area) Will be charged. From such a point of view, the range in which the discharge chamber 11 as a whole can be neutralized by arranging the four discharge needles 11A to 11D as shown in the drawing is the discharge needles 11A, 11B, 11C as shown in FIG. , The overlapping part of the corona discharge area formed in a cone shape by 11D becomes an area that can be neutralized, and it is possible to eliminate static electricity in a wide space. In addition to the above effect, the (+) space and the (−) space are alternately positioned on the top, bottom, left and right. In addition, the ion balance in the static elimination chamber 6 can be improved, that is, the charging voltage can be reduced.

上記除電手段の作動は、湿度センサの測定結果に対応して手動で行なうこともできるが、湿度センサによる湿度の計測値に対応して適宜自動的に作動させ、除電に先立って除電室６をイオンで満たしておけば除電が必要な時に、短時間でかつ完全に除電することができる。   The operation of the static elimination means can be performed manually corresponding to the measurement result of the humidity sensor, but it is automatically activated appropriately according to the humidity measurement value by the humidity sensor, and the static elimination chamber 6 is opened prior to static elimination. If it is filled with ions, it can be completely neutralized in a short time when neutralization is required.

なお、電子天秤に配置される放電針同志の配置間隔は２５〜５０ｍｍ程度が好適であって、これより近すぎると各放電針から放たれたイオンが隣接する放電針のイオンと結合して消えてしまうためイオンが遠くまで飛ばない。反対に離れすぎると除電ができないエリアであるイオンが重複しないエリアが多くなり、逆にこの部分では対象物は帯電してしまう。   It should be noted that the interval between the discharge needles arranged on the electronic balance is preferably about 25 to 50 mm, and if it is too close, ions emitted from each discharge needle are combined with the ions of the adjacent discharge needle and disappear. As a result, ions do not fly far. On the contrary, if it is too far away, there are many areas where ions that cannot be neutralized do not overlap, and conversely, the object is charged in this area.

除電室６は上述のように密閉空間であってイオンで満たすことが可能であるため、試料の除電は高効率かつ万遍なく可能である。
除電が完了したならばサイドドアを開け、この状態で試料を下部の計量室７の計量皿２に載置しかつサイドドアを閉めて試料の計量を行なう。 Since the static elimination chamber 6 is a sealed space as described above and can be filled with ions, the static elimination of the sample can be performed with high efficiency and evenly.
When the neutralization is completed, the side door is opened, and in this state, the sample is placed on the weighing pan 2 of the lower weighing chamber 7 and the side door is closed to measure the sample.

上記実施例では除電室６に設置する除電手段は直流電圧印加方式であるが、計量室とは独立して除電室内が密閉されているため、空気流を生じる交流電圧印加方式の除電手段も設置可能である。   In the above embodiment, the static elimination means installed in the static elimination chamber 6 is a DC voltage application method. However, since the static elimination chamber is sealed independently of the measurement chamber, an AC voltage application type static elimination means that generates an air flow is also installed. Is possible.

また実施例では除電室６を上部に、計量室７を除電室６の下部に形成する構成としているが、計量室７の下部に除電室６を構成することも可能である。この場合には除電室６の天井面が除電室６と計量室７とを区画する仕切となり、この仕切の中に計量皿２と荷重計測機構１３とを接続する荷重伝達用のビームが配置されることになる。   In the embodiment, the static elimination chamber 6 is formed in the upper part and the measurement chamber 7 is formed in the lower part of the static elimination chamber 6. However, the static elimination chamber 6 can be configured in the lower part of the measurement chamber 7. In this case, the ceiling surface of the static elimination chamber 6 serves as a partition that divides the static elimination chamber 6 and the weighing chamber 7, and a load transmitting beam for connecting the weighing pan 2 and the load measuring mechanism 13 is disposed in this partition. Will be.

更に、実施例ではサイドドア１０ａ、１０ｂは計量空間５に対して一体的に開閉するドアとして構成されているが、除電室６及び計量室７に対してそれぞれ独立に開閉するサイドドアを配置することも可能である。   Further, in the embodiment, the side doors 10a and 10b are configured as doors that are integrally opened and closed with respect to the weighing space 5, but side doors that are opened and closed independently with respect to the charge removal chamber 6 and the weighing chamber 7 are arranged. It is also possible.

本発明に係る電子秤であって、（Ａ）は側面図、（Ｂ）は正面図である。It is the electronic balance which concerns on this invention, Comprising: (A) is a side view, (B) is a front view. 図１に示す電子秤の斜視図である。It is a perspective view of the electronic balance shown in FIG. 直流電圧印加方式の除電手段における除電針の配置状態と除電可能空間との関係を概念的に示す模式図であって（Ａ）は４個の放電針を配置した構成を上から見た図を、（Ｂ）は側面から見た図を、（Ｃ）は配置状態の斜視図を示す。It is the model which shows notionally the relationship between the arrangement | positioning state of the static elimination needle in the DC voltage application type static elimination means, and the static elimination possible space, (A) is the figure which looked at the structure which has arrange | positioned four discharge needles from the top. , (B) is a side view, and (C) is a perspective view of the arrangement state.

１ 電子秤
２ 計量皿
３ 機構室
４ 仕切板
５ 計量用空間
６ 除電室
７ 計量室
８ａ、８ｂ 梁材
９ （仕切板固定用）ビス
１０ａ、１０ｂ サイドドア
１１Ａ、１１Ｂ、１１Ｃ、１１Ｄ 放電針
１２ 除電器
１３ 荷重計測機構
Ｓ１、Ｓ２、Ｓ３ 湿度センサ DESCRIPTION OF SYMBOLS 1 Electronic scale 2 Weighing pan 3 Mechanism room 4 Partition plate 5 Measurement space 6 Static elimination chamber 7 Measurement chamber 8a, 8b Beam material 9 (For partition plate fixation) Screw 10a, 10b Side door 11A, 11B, 11C, 11D Discharge needle 12 Static eliminator 13 Load measurement mechanism S1, S2, S3 Humidity sensor

Claims (9)

試料を計量する計量用空間を有する電子秤において、当該計量用空間は除電室と計量室とに区画形成され、除電室には除電手段が配置されていることを特徴とする除電手段を有する電子秤。 An electronic balance having a measuring space for measuring a sample, wherein the measuring space is divided into a charge removing chamber and a measuring chamber, and the charge removing device is arranged in the charge removing chamber. Scale. 計量用空間は水平に配置された仕切板により上下の空間に区画形成され、上部の空間は除電室として構成され、下部の空間は計量皿を有する計量室として構成されていることを特徴とする請求項１記載の除電手段を有する電子秤。 The weighing space is divided into upper and lower spaces by partition plates arranged horizontally, the upper space is configured as a static elimination chamber, and the lower space is configured as a weighing chamber having a weighing pan. An electronic balance comprising the charge eliminating means according to claim 1. 仕切板は計量用空間を形成するサイドドア近傍において水平に配置された梁材に対して差し渡し配置されるよう構成され、かつ当該梁材に対して着脱可能に固定されていることを特徴とする請求項２記載の除電手段を有する電子秤。 The partition plate is configured so as to be handed over to a beam material arranged horizontally in the vicinity of the side door forming the measurement space, and is fixed to the beam material so as to be detachable. An electronic balance having the charge eliminating means according to claim 2. 除電手段はプラスの放電針及びマイナスの放電針をそれぞれ１個以上配置した直流電圧印加方式により構成されていることを特徴とする請求項１乃至３の何れかに記載の除電手段を有する電子秤。 4. The electronic balance having the charge eliminating means according to claim 1, wherein the charge eliminating means is constituted by a DC voltage application system in which one or more plus discharge needles and one minus discharge needle are arranged. . 除電手段はプラス又はマイナスの複数の放電針が上下方向及び左右方向にそれぞれ交互に配置されていることを特徴とする請求項４記載の除電手段を有する電子秤。 5. The electronic balance having the charge removing means according to claim 4, wherein the charge removing means has a plurality of plus or minus discharge needles arranged alternately in the vertical direction and the horizontal direction. 各放電針は除電室の後壁に配置され、かつ放電針に電圧を印加する除電器は機構室に配置され、各放電針は機構室と除電室を区画する後壁を介して当該除電器に接続していることを特徴とする請求項４又は５記載の除電手段を有する電子秤。 Each discharge needle is arranged on the rear wall of the static elimination chamber, and a static eliminator for applying a voltage to the discharge needle is arranged in the mechanism chamber, and each discharge needle is connected to the static eliminator via the rear wall dividing the mechanism chamber and the static elimination chamber. The electronic balance having the charge eliminating means according to claim 4, wherein the electronic balance is connected to the balance. 除電手段は空気流を伴う交流電圧印加方式により構成されていることを特徴とする請求項請求項１乃至３の何れかに記載の除電手段を有する電子秤。 4. The electronic balance having the charge eliminating means according to claim 1, wherein the charge eliminating means is configured by an AC voltage application method with an air flow. 除電室内、計量室内、電子秤外部の少なくとも一か所に湿度センサが配置され、当該湿度センサの計測湿度に対応して除電手段の作動を手動又は自動で行なうよう構成したことを特徴とする請求項１乃至７の何れかに記載の除電手段を有する電子秤。 A humidity sensor is disposed in at least one location outside the static elimination chamber, the measurement chamber, and the electronic scale, and the static elimination means is operated manually or automatically in accordance with the measured humidity of the humidity sensor. Item 9. An electronic balance having the charge eliminating means according to any one of Items 1 to 7. 除電室の後壁に配置されている放電針はホルダー内に収納されてホルダーと共にユニット化され、このユニットは特別な工具を用いることなく着脱することが可能に構成され、放電針を簡単かつ安全に着脱できるようにしたことを特徴とする請求項１乃至８の何れかに記載の除電手段を有する電子秤。 The discharge needle placed on the rear wall of the static elimination chamber is housed in the holder and united with the holder. This unit can be attached and detached without using a special tool, making the discharge needle simple and safe. 9. An electronic balance having a charge eliminating means according to claim 1, wherein the electronic balance is removable.
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