JPS6176946A - Water quantity-sensitive window wiper - Google Patents
Water quantity-sensitive window wiperInfo
- Publication number
- JPS6176946A JPS6176946A JP59199061A JP19906184A JPS6176946A JP S6176946 A JPS6176946 A JP S6176946A JP 59199061 A JP59199061 A JP 59199061A JP 19906184 A JP19906184 A JP 19906184A JP S6176946 A JPS6176946 A JP S6176946A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- wiper
- output
- detecting
- water
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
- B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/955—Proximity switches using a capacitive detector
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の分野〕
本発明は雨ＡｔＦ−窓に付着する水の量に感応して動作
する車両等の水量感応窓拭器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a water volume sensitive window cleaner for vehicles, etc., which operates in response to the amount of water adhering to a rain window.
車両等に用いられる窓拭器は手動により一定の速度又は
間欠動作によって作動するように構成されている。しか
しながらガラス面への雨滴の付着によって自動的に動作
し、その速度も変化することが好ましい。このようなガ
ラス面の自動窓拭器としては、例えば日産技報昭和５８
年１２月号（第１９号）第９７頁に示されているように
、車両のボンネット上に圧電検知素子を配置した水滴検
知センサを用いたものが知られている。この水滴検知セ
ン号は圧電検知素子を用いて雨滴の落下による振動を電
気信号として検出し積分回路に導き、そのレベルが一定
値に達すればワイパーを動作させると共に積分コンデン
サをリセットするようにしたものである。Window cleaners used in vehicles and the like are configured to be manually operated at a constant speed or intermittently. However, it is preferable that it operates automatically and its speed changes depending on the adhesion of raindrops to the glass surface. An example of such an automatic window cleaner for glass surfaces is the Nissan Giho 1983
As shown on page 97 of the December issue (No. 19), a sensor using a water droplet detection sensor in which a piezoelectric detection element is arranged on the hood of a vehicle is known. This water drop detection sensor uses a piezoelectric detection element to detect vibrations caused by falling raindrops as an electrical signal and sends it to an integrating circuit.When the level reaches a certain value, it operates the wiper and resets the integrating capacitor. It is.
しかしながらこのような水滴検知センサによれば、車両
の撮動やホーン等外部の雑音により誤動作する恐れがあ
った。又降雪時にもワイパーを動作させる必要があるが
、圧電検知素子を車両のボンネット上に取付けているた
め雪がボンネット上に積もれば雪を検知することができ
なくなり、ワイパーが動作しなくなるという問題点があ
った。However, such a water droplet detection sensor may malfunction due to external noise such as vehicle photography or a horn. Additionally, it is necessary to operate the wipers when it snows, but since the piezoelectric detection element is installed on the hood of the vehicle, if snow accumulates on the hood, it will not be able to detect the snow, and the wipers will no longer operate. there were.
又圧電検知素子の代わりに光電センサによってガラス面
に付着する雨滴を検知する方法も考えられるが、周囲の
明るさが大幅に変化するため雨滴のみを検知することが
困難であり、ガラス面に一様に雨滴が付着する場合には
充分検出することができないという問題点があった。Another option is to use a photoelectric sensor instead of a piezoelectric sensor to detect raindrops on the glass surface, but it is difficult to detect only raindrops because the surrounding brightness changes significantly, and it is difficult to detect only raindrops on the glass surface. There is a problem in that sufficient detection is not possible when raindrops adhere to the sensor.
本発明はこのような従来の水量感応窓拭器の問題点に鑑
みてなされたものであって、静電容量の変化によって検
知面に付着する水滴を検知しワイパーを駆動する水量感
応窓拭器を提供することを目的とする。The present invention has been made in view of the problems of conventional water volume sensitive window cleaners, and provides a water volume sensitive window cleaner that detects water droplets adhering to the detection surface by changes in capacitance and drives the wiper. The purpose is to provide
本発明はガラス面に密着するブレードを含み該ブレード
を掃引するワイパーを有し、掃引によってガラス面に付
着する水滴を除去する窓拭器であって、ガラス面の掃引
領域の裏面に設けられ検知電極と該検知電極を取り囲む
接地電極とを有する検知電極板と、検知電極板の電極間
の静電容量を含む共振回路により構成され、検知電極板
の検知面の水滴の有無による振幅変化が水腹の有無によ
る振幅変化より大きい周波数を発１辰周波数とした発振
回路と、発振回路の発振振幅を所定の基準値と比較し、
振幅変動に基づいて水滴の付着を検知する比較回路と、
比較回路の比較出力により前記ワイパーを駆動する駆動
手段と、を具備することを特徴とするものである。The present invention is a window cleaner that includes a wiper that includes a blade that closely contacts the glass surface and that sweeps the blade, and that removes water droplets that adhere to the glass surface by sweeping. It is composed of a sensing electrode plate having an electrode and a ground electrode surrounding the sensing electrode, and a resonant circuit including a capacitance between the electrodes of the sensing electrode plate. An oscillation circuit whose oscillation frequency is greater than the amplitude change due to the presence or absence of an antinode, and the oscillation amplitude of the oscillation circuit is compared with a predetermined reference value,
a comparison circuit that detects adhesion of water droplets based on amplitude fluctuations;
The present invention is characterized by comprising a driving means for driving the wiper using a comparison output of a comparison circuit.
このような特徴を有する本発明によれば、検知電極板が
設けられる窓ガラスの検知領域に付着する水滴によって
電極間の静電容量の変化に基づ（発振振幅を検知し水滴
の有無を検出しているため、外部の音や光量変化の影響
を受けることがない。According to the present invention having such characteristics, the presence or absence of water droplets is detected based on the change in capacitance between the electrodes due to water droplets adhering to the detection area of the window glass on which the detection electrode plate is provided (by detecting the oscillation amplitude). Therefore, it is not affected by external sounds or changes in light intensity.
又発振回路の発振周波数は水滴の有無による変化量を、
薄い水腹の有無による変化量より大きくなるように周波
数を選択し、その振１順変化により水滴を検知している
ため、ワイパー動作後に残る薄い水膜でなく水滴のみを
確実に検出するこ止が可能となる。従って運転者は動作
スイッチを入れておくだけでこの水量感応窓拭器がガラ
ス面に付着する水滴の量を自動的に検出してワイパーを
動作させる。又ワイパーの動作後水滴がなくなれば動作
を停止するが、続いて水滴が付着した場合には速やかに
ワイパーが駆動されるので水滴の量に応してワイパーを
高速及び低速で動作させることができる。それ故車両の
ガラス面を一定の視界に保つことが可能となり、運転の
安全性を高めることができる。In addition, the oscillation frequency of the oscillation circuit is determined by the amount of change due to the presence or absence of water droplets.
The frequency is selected so that it is larger than the amount of change due to the presence or absence of a thin water belly, and water droplets are detected by the sequential change in the frequency, making it possible to reliably detect only water droplets and not the thin water film that remains after wiper operation. becomes possible. Therefore, the driver only has to turn on the operation switch, and this water-sensitive window cleaner automatically detects the amount of water droplets adhering to the glass surface and operates the wiper. In addition, the wiper will stop operating if there are no more water droplets after it has been activated, but if water droplets subsequently adhere to the wiper, the wiper will be activated immediately, allowing the wiper to operate at high or low speeds depending on the amount of water droplets. . Therefore, it is possible to maintain a constant field of view on the glass surface of the vehicle, and driving safety can be improved.
第２図は本発明の水量感応窓拭器に用いられるセンサ部
の一実施例を示す回路図である。本図において検知電極
板１が発振回路２に接続されその静電容量によって所定
の周波数で発振し、その出力が検波回路３によって検波
される。検知電極板１は第３図に電極面を示すように中
央に細長い楕円状の検知電極１ａと、その周囲を取巻く
環状の副電極１ｂとを有している。そして検知電極板１
の外周に副電極１ｂから一定の距離を隔ててそれらを環
状に取巻く接地電極ＩＣが設けられている。FIG. 2 is a circuit diagram showing an embodiment of the sensor section used in the water volume sensitive window cleaner of the present invention. In this figure, a detection electrode plate 1 is connected to an oscillation circuit 2 and oscillates at a predetermined frequency due to its capacitance, and its output is detected by a detection circuit 3. As shown in FIG. 3, the detection electrode plate 1 has an elongated elliptical detection electrode 1a at the center and an annular sub-electrode 1b surrounding the detection electrode 1a. And detection electrode plate 1
A ground electrode IC is provided on the outer periphery of the sub-electrode 1b at a certain distance from the sub-electrode 1b and surrounding the sub-electrode 1b in an annular manner.
検知電極板ｌの他方の面は窓ガラス等を介して、又は直
接に水等が付着することがある検知面として構成される
。これらの３つの電ＪＭ１ａ〜ＩＣは夫々第１図に示す
端子４．５．６に接続される。The other surface of the detection electrode plate 1 is configured as a detection surface to which water or the like may adhere directly or through a window glass or the like. These three electric terminals JM1a to IC are respectively connected to terminals 4.5.6 shown in FIG.
ここで検知電極板１は検知電極１ａ、副電極１ｂ間の静
電容量を０１とし、検知電極１ａと接地電極１０間の静
電容量をＣ２とすると、夫々の静電容量が発振回路２の
抵抗Ｒ１，Ｒ２に並列に接続されることとなる。発振回
路２はトランジスタＴｒ１及びトランジスタＴｒ２が縦
続接続されて増幅器を構成しており、トランジスタＴｒ
２のエミッタとトランジスタＴｒｉのベース間に抵抗Ｒ
１，トランジスタＴｒｉのベース・アース間に抵抗Ｒ２
が接続されている。そしてトランジスタＴｒｉのエミッ
タ・アース間には抵抗Ｒ３が接続され、その両端の電圧
がコンデンサＣ３を介して可変抵抗Ｒ４の中点に与えら
れる。可変抵抗Ｒ４は周波数を可変するための抵抗であ
って、抵抗Ｒ５と共にトランジスタＴｒ２のエミッタ抵
抗を構成している。こうして抵抗Ｒ１，静電容量Ｃ１と
抵抗Ｒ２，静電容量Ｃ２、及び抵抗Ｒ３と抵抗Ｒ４，コ
ンデンサＣ１とによってブリッジ回路が形成されて発振
周波数が定められる。この発振回路２の発振出力は検波
回路３に伝えられコンデンサＣ４，抵抗Ｒ６を介して増
幅用トランジスタＴｒ３に与えられる。検波回路３は与
えられた高周波出力を増幅し検波するものであって、コ
ンデンサＣ５，Ｃ６と抵抗Ｒ７から成る平滑回路を有し
ている。Here, in the detection electrode plate 1, if the capacitance between the detection electrode 1a and the sub-electrode 1b is 01, and the capacitance between the detection electrode 1a and the ground electrode 10 is C2, then each capacitance is the same as that of the oscillation circuit 2. It will be connected in parallel to resistors R1 and R2. The oscillation circuit 2 includes a transistor Tr1 and a transistor Tr2 connected in series to form an amplifier.
A resistor R is connected between the emitter of 2 and the base of transistor Tri.
1. Resistor R2 between the base and ground of transistor Tri
is connected. A resistor R3 is connected between the emitter of the transistor Tri and ground, and the voltage across it is applied to the midpoint of the variable resistor R4 via a capacitor C3. The variable resistor R4 is a resistor for varying the frequency, and together with the resistor R5 constitutes the emitter resistor of the transistor Tr2. In this way, a bridge circuit is formed by the resistor R1, the capacitor C1, the resistor R2, the capacitor C2, and the resistor R3, the resistor R4, and the capacitor C1, and the oscillation frequency is determined. The oscillation output of the oscillation circuit 2 is transmitted to the detection circuit 3 and applied to the amplification transistor Tr3 via a capacitor C4 and a resistor R6. The detection circuit 3 amplifies and detects the applied high frequency output, and has a smoothing circuit including capacitors C5 and C6 and a resistor R7.
第４図は車両の前面に設けられるワイパーの動作面を拡
大して示す図である。本図においてワイパー１０はアー
ム１１と窓ガラス１２の面に密着したラバーから成るブ
レード１３を有している。FIG. 4 is an enlarged view showing the operating surface of the wiper provided on the front of the vehicle. In this figure, a wiper 10 has an arm 11 and a blade 13 made of rubber that is in close contact with the surface of a window glass 12.
アーム１１は図示の矢印のように往復運動をし、それに
よってブレード１３は窓ガラス１２上に扇型の拭き払い
面１４を形成する。そしてこの拭き払い面１４の一部に
図示のように水滴の量を検出する検知領域１５が設けら
れる。窓ガラス１２の検知領域１５の裏面には第３図に
示す検知電極板１が形成され、検知電極１ａと副電極１
ｂ及び接地電極１ｃが形成されている。The arm 11 reciprocates as shown by the arrow, so that the blade 13 forms a fan-shaped wiping surface 14 on the window glass 12. As shown in the figure, a detection area 15 for detecting the amount of water droplets is provided on a part of this wiping surface 14. The detection electrode plate 1 shown in FIG.
b and a ground electrode 1c are formed.
次に第１図は本発明による水量感応窓拭器の一実施例を
示すブロック図である。前述したように検知電極板１が
発振回路２に接続され、発振出力が検波回路３に与えら
れて水滴検知センサ７を構成している。水滴検知センサ
７の出力は本図に示すように反転増幅回路２０に伝えら
れて増幅される。この増幅出力は発振回路２や検波回路
３及び反転増幅回路２０の長時間に渡る温度変化等の発
振振幅の変動や、窓ガラス１２の汚れ等の付着に伴う長
期間に渡る変化を取除くために微分回路２１に与えられ
る。微分回路２１は水滴の付着に伴う短時間の発振振幅
の変化のみを次段の比較回路２２に伝えるものである。Next, FIG. 1 is a block diagram showing an embodiment of a water volume sensitive window cleaner according to the present invention. As described above, the detection electrode plate 1 is connected to the oscillation circuit 2, and the oscillation output is given to the detection circuit 3 to constitute the water droplet detection sensor 7. The output of the water droplet detection sensor 7 is transmitted to an inverting amplifier circuit 20 and amplified as shown in the figure. This amplified output is used to remove fluctuations in the oscillation amplitude caused by long-term temperature changes in the oscillation circuit 2, detection circuit 3, and inverting amplifier circuit 20, as well as long-term changes caused by dirt, etc. on the window glass 12. is applied to the differentiating circuit 21. The differentiating circuit 21 transmits only short-term changes in oscillation amplitude due to adhesion of water droplets to the next-stage comparison circuit 22.
比較回路２２には更に設定器２３より所定の基準電圧が
与えられている。The comparator circuit 22 is further supplied with a predetermined reference voltage from a setter 23.
設定器２３はワイパー１０を動作させる感度を調整する
ものであってその基準値レベルをＶ ｒｅｆとする。比
較回路２２は入力信号がこの基準電圧Ｖｒｅｆを越える
場合にキ★知出力をワイパー駆動部２４に伝える。ワイ
パー駆動部２４は検知出力に基づいて車両に設けられた
ワイパー１０に所定時間通電することによって動作させ
るものである。The setting device 23 is for adjusting the sensitivity for operating the wiper 10, and its reference value level is set to V ref. Comparison circuit 22 transmits a key output to wiper drive unit 24 when the input signal exceeds this reference voltage Vref. The wiper drive unit 24 operates by energizing the wiper 10 provided on the vehicle for a predetermined period of time based on the detection output.
次に第５図は発振回路２の発振周波数に対して窓ガラス
１２に付着する水の有無による出力電圧変化の特性を示
すものである。本図において窓ガラス１２の表面に薄い
水膜が一様に付着する場合には、周波数に対応する出力
電圧の変化量は図示の曲線Ａで示される。一方窓ガラス
１２上に水滴が付着する場合には周波数に対応した出力
電圧変化量は図中の直線Ｂで示される。この水滴検知セ
ンサを車両のワイパーの駆動信号源として用いる場合に
は、窓ガラス１２上にワイパー駆動後等に薄い水膜が付
着していてもその水膜は極めて短時間で乾燥し、窓ガラ
ス１２と水膜を通して前方の状態を充分把握することが
できるので、特にワイパーを動作させる必要はない。従
ってこのときには水滴検知センサより検知信号を得る必
要はないが、窓ガラス１２上に水滴が付着した場合には
窓ガラスを通して前方の把握が困難であるので速やかに
ワイパーを動作させる必要がある。従って水膜による出
力電圧の変化量はできる限り少なく水滴による出力電圧
変化量が多いことが好ましい。Next, FIG. 5 shows the characteristics of the output voltage change depending on the presence or absence of water adhering to the window glass 12 with respect to the oscillation frequency of the oscillation circuit 2. In this figure, when a thin water film is uniformly attached to the surface of the window glass 12, the amount of change in the output voltage corresponding to the frequency is shown by the illustrated curve A. On the other hand, when water droplets adhere to the window glass 12, the amount of change in output voltage corresponding to the frequency is shown by straight line B in the figure. When using this water droplet detection sensor as a driving signal source for a vehicle wiper, even if a thin film of water adheres to the window glass 12 after the wiper is driven, the water film dries in a very short time and There is no need to operate the wipers because the conditions ahead can be fully grasped through the windshield 12 and the water film. Therefore, at this time, it is not necessary to obtain a detection signal from the water drop detection sensor, but if water droplets adhere to the window glass 12, it is difficult to see what is ahead through the window glass, so it is necessary to operate the wiper promptly. Therefore, it is preferable that the amount of change in the output voltage due to the water film is as small as possible and the amount of change in the output voltage due to the water droplets is as large as possible.
それ故発振回路２の発振周波数は少なくとも水滴による
出力電圧変化量（直線Ｂ）が水腹による出力電圧変化量
（曲線Ａ）より大きな周波数帯域とし、好ましくはその
差が充分大きい周波数帯、即ち図中斜線で示すように周
波数ＬＭ）ｌｚ前後の帯域を発振周波数とすることによ
って水滴のみを検出することが可能となる。Therefore, the oscillation frequency of the oscillation circuit 2 should be set at least in a frequency band in which the amount of change in output voltage due to water droplets (straight line B) is larger than the amount of change in output voltage due to water belly (curve A), and preferably in a frequency band where the difference is sufficiently large, that is, in the frequency band shown in FIG. By setting the band around the frequency LM)lz as the oscillation frequency as shown by the middle diagonal line, it becomes possible to detect only water droplets.
次にこの水量感応窓拭器の動作について第６図の波形図
を参照しつつ説明する。今発振回路２のブリッジの回路
定数を調整することによって発振周波数を曲線Ａ、直線
Ｂの差が最も大きい周波数、例えばＩＭＨｚと定めたと
する。そして動作を開始させると発振回路２は所定の周
波数で発振する。Next, the operation of this water volume sensitive window cleaner will be explained with reference to the waveform diagram in FIG. Suppose now that the oscillation frequency is determined by adjusting the circuit constants of the bridge of the oscillation circuit 2 to the frequency at which the difference between the curve A and the straight line B is the largest, for example, IMHz. When the operation is started, the oscillation circuit 2 oscillates at a predetermined frequency.
発振周波数は水膜による振幅変化が少ない周波数に選択
されているので、窓ガラス１２上に水膜が付着してもそ
の振幅値はほとんど変化しない。又第６図（ａｌに示す
ように長期間の動作により反転増幅回路２０の出力は温
度変化等によって徐々に変化するが、微分回路２１にそ
れらの出力が伝えられないので第６図山）に示すように
微分回路の出力はほぼ一定となっている。さて時刻Ｌ１
より窓ガラス１２に雨滴が付着し始めたとすると、検波
回路３の出力が低下するので第６図ｆａｔに示すように
反転増幅回路２０の出力は徐々に増加する。微分回路２
１はその出力変化を次段の比較回路２２に伝える。従っ
て比較回路２２の入力レベルが設定器２３に定まる基準
値レベルＶｒｅｆに達する時刻ｔ２には第６図（Ｃ）に
示すように比較回路２２より出力がワイパー駆動部２４
に伝えられる。ワイパー駆動部２４は第６図（ｄ）に示
すように比較回路２２の立上りに基づいて一定時間ワイ
パー１０を駆動するものである。そうすれば第６図（ｅ
）に示すようにワイパー１０が動作を開始する。そのと
きワイパーのブレード１３が検知領域１５にさしかかっ
てその部分にイ」着した雨滴を除去し、同時にブレード
１３の通過によって第６図（ａｌに示すように時刻ｔ３
． ｔ４にピーク値信号が得られることとなる。ブレー
ドＩ３が通過すれば検知領域１５の雨滴が除去されるた
め反転増幅回路２０の出力レベルは急激に低下するが、
引き続いて雨が降っている場合には時刻Ｌ４以後再びそ
の出力レベルが上昇する。Since the oscillation frequency is selected to be a frequency where the amplitude change due to the water film is small, even if the water film adheres to the window glass 12, the amplitude value hardly changes. Also, as shown in Fig. 6 (al), the output of the inverting amplifier circuit 20 gradually changes due to temperature changes due to long-term operation, but since these outputs are not transmitted to the differentiating circuit 21, As shown, the output of the differentiator circuit is almost constant. Now time L1
As more raindrops begin to adhere to the window glass 12, the output of the detection circuit 3 decreases, so that the output of the inverting amplifier circuit 20 gradually increases as shown in fat in FIG. Differential circuit 2
1 transmits the output change to the comparison circuit 22 at the next stage. Therefore, at time t2 when the input level of the comparator circuit 22 reaches the reference value level Vref determined by the setter 23, the output from the comparator circuit 22 is sent to the wiper drive unit 24 as shown in FIG. 6(C).
can be conveyed to. The wiper driving section 24 drives the wiper 10 for a certain period of time based on the rising edge of the comparison circuit 22, as shown in FIG. 6(d). Then, Figure 6 (e
), the wiper 10 starts operating. At that time, the wiper blade 13 approaches the detection area 15 and removes the raindrops that have landed on that area, and at the same time, as the blade 13 passes, as shown in FIG.
．． A peak value signal will be obtained at t4. When the blade I3 passes, the raindrops in the detection area 15 are removed, so the output level of the inverting amplifier circuit 20 drops rapidly.
If it continues to rain, the output level increases again after time L4.
そして第６図（ｂｌに示すように微分回路２１の出力が
設定″ｃＩ２３の基準値レベルＶ ｒｅｆに達する時刻
ｔ５には再びワイパー駆動部２４を介してワイパー１０
が駆動され、以後同様の動作を繰り返す。このとき雨滴
の量に応じて時刻ｔ２からｔ５までの時間が連続的に変
化するため雨滴の量に応じてワイパーの動作時間を連続
的に変化させることが可能となる。Then, as shown in FIG. 6 (bl), at time t5 when the output of the differentiating circuit 21 reaches the reference value level V ref of the setting "cI23," the wiper 10 is again
is driven, and the same operation is repeated thereafter. At this time, since the time from time t2 to t5 changes continuously depending on the amount of raindrops, it is possible to continuously change the wiper operating time depending on the amount of raindrops.
尚本実施例は車両のフロントガラスに用いられる窓拭器
について説明したが、本発明はリアウィンドに用いるも
のであってもよく、又車両に限らず船舶等の窓拭器に適
用することも可能である。Although this embodiment describes a window washer used for the windshield of a vehicle, the present invention may also be used for a rear window, and can also be applied to a window washer not only for vehicles but also for ships, etc. It is possible.
第１図は本発明による水量感応窓拭器の一実施例を示す
ブロック図、第２図はそのセンサ部分の回路図、第３図
はセンサに用いる検知電極板を示す上面図、第４図は車
両の前面に設けられるワイパーの動作面の拡大図、第５
図は水滴検知センサに用いる発振回路の発振周波数と水
の状態による出力電圧変化量を示すグラフ、第６図は本
実施例の各部の波形を示す波形図である。
１−−−−−−一検知電極板 １ａ−・−・−検知電
極 １ｂ−−−−ｍ−・副電極 １ ｃ −−−−
−−一接地電極 ２−・−発振回路 ３−・−・−
検波回路 ７−−−−−−−水滴検知センサ １１
−−−−−−・ワイパー １２−・−窓ガラス１３−
−−−−一・ブレード ｌ ４−−−−−−一拭き払
い面 １５−・−・検知領域 ２０・−一−−−−
反転増幅回路 ２Ｉ・−−−一−−微分回路 ２２
−・・−比較回路 ２３−・−・設定器 ２４−−
−−−ワイパー駆動部特許出願人 立石電機株式会
社
代理人 弁理士 岡本宜喜（化１名）
第４図
第５図
間層［ｊ（Ｈｚ）
第６図
ｔ’１ｔ３’
ｔ’２１ｔ４ ｔｓ
） ：
ｉFig. 1 is a block diagram showing an embodiment of a water volume sensitive window cleaner according to the present invention, Fig. 2 is a circuit diagram of its sensor portion, Fig. 3 is a top view showing a detection electrode plate used in the sensor, and Fig. 4 5 is an enlarged view of the operating surface of the wiper installed on the front of the vehicle.
The figure is a graph showing the oscillation frequency of the oscillation circuit used in the water droplet detection sensor and the amount of change in output voltage depending on the state of the water, and FIG. 6 is a waveform diagram showing the waveforms of various parts of this embodiment. 1--------One detection electrode plate 1a----Detection electrode 1b---m-・Sub-electrode 1c----
--1 ground electrode 2-・-oscillation circuit 3-・-・-
Detection circuit 7------Water drop detection sensor 11
--------・Wiper 12-・-Window glass 13-
----1.Blade l 4-------1 Wiping surface 15--Detection area 20--1----
Inverting amplifier circuit 2I・---1---differentiating circuit 22
---Comparison circuit 23---Setting device 24--
---Wiper drive unit patent applicant Tateishi Electric Co., Ltd. Agent Patent attorney Yoshiki Okamoto (1 person) Figure 4 Figure 5 Interlayer [j (Hz) Figure 6 t'1t3't'21t4 ts ) : i
Claims (3)
掃引するワイパーを有し、掃引によってガラス面に付着
する水滴を除去する窓拭器であって、 前記ガラス面の掃引領域の裏面に設けられ検知電極と該
検知電極を取り囲む接地電極とを有する検知電極板と、 前記検知電極板の電極間の静電容量を含む共振回路によ
り構成され、前記検知電極板の検知面の水滴の有無によ
る振幅変化が水膜の有無による振幅変化より大きい周波
数を発振周波数とした発振回路と、 前記発振回路の発振振幅を所定の基準値と比較し、振幅
変動に基づいて水滴の付着を検知する比較回路と、 前記比較回路の比較出力により前記ワイパーを駆動する
駆動手段と、を具備することを特徴とする水量感応窓拭
器。(1) A window washer that has a wiper that includes a blade that comes into close contact with the glass surface and sweeps the blade, and that removes water droplets that adhere to the glass surface by sweeping, the wiper being provided on the back side of the sweeping area of the glass surface. It is composed of a sensing electrode plate having a sensing electrode and a ground electrode surrounding the sensing electrode, and a resonant circuit including a capacitance between the electrodes of the sensing electrode plate, and the amplitude varies depending on the presence or absence of water droplets on the sensing surface of the sensing electrode plate. an oscillation circuit whose oscillation frequency is set to a frequency whose change is larger than an amplitude change due to the presence or absence of a water film; and a comparison circuit which compares the oscillation amplitude of the oscillation circuit with a predetermined reference value and detects adhesion of water droplets based on the amplitude variation. A water volume sensitive window cleaner, comprising: a drive means for driving the wiper based on the comparison output of the comparison circuit.
の有無による振幅変化と水膜の有無による振幅変化との
差が充分大きい周波数を発振周波数としたことを特徴と
する特許請求の範囲第１項記載の水量感応窓拭器。(2) The oscillation circuit has an oscillation frequency set to a frequency at which a difference in amplitude due to the presence or absence of water droplets on the detection surface of the detection electrode plate and an amplitude change due to the presence or absence of a water film is sufficiently large. A water volume sensitive window cleaner as described in Scope 1.
とを特徴とする特許請求の範囲第１項記載の水量感応窓
拭器。(3) The water volume sensitive window cleaner according to claim 1, wherein the ground electrode of the detection plate is connected to a vehicle.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59199061A JPS6176946A (en) | 1984-09-21 | 1984-09-21 | Water quantity-sensitive window wiper |
| US06/777,432 US4748390A (en) | 1984-09-19 | 1985-09-18 | Capacitive-type detection device |
| EP85111828A EP0175362A3 (en) | 1984-09-19 | 1985-09-18 | Capacitive-type detection device |
| KR1019850006855A KR910005905B1 (en) | 1984-09-19 | 1985-09-19 | Capacitive ditection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59199061A JPS6176946A (en) | 1984-09-21 | 1984-09-21 | Water quantity-sensitive window wiper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6176946A true JPS6176946A (en) | 1986-04-19 |
Family
ID=16401454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59199061A Pending JPS6176946A (en) | 1984-09-19 | 1984-09-21 | Water quantity-sensitive window wiper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6176946A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0268248A (en) * | 1988-09-02 | 1990-03-07 | Honda Motor Co Ltd | Automatic control method for electric windshield wiper |
| JP2008195396A (en) * | 2008-05-07 | 2008-08-28 | Ppg Industries Ohio Inc | Moisture detection system and its use |
-
1984
- 1984-09-21 JP JP59199061A patent/JPS6176946A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0268248A (en) * | 1988-09-02 | 1990-03-07 | Honda Motor Co Ltd | Automatic control method for electric windshield wiper |
| JP2008195396A (en) * | 2008-05-07 | 2008-08-28 | Ppg Industries Ohio Inc | Moisture detection system and its use |
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