JPH04325353A - Outside mirror with waterdrop splashing device - Google Patents
Outside mirror with waterdrop splashing deviceInfo
- Publication number
- JPH04325353A JPH04325353A JP3122224A JP12222491A JPH04325353A JP H04325353 A JPH04325353 A JP H04325353A JP 3122224 A JP3122224 A JP 3122224A JP 12222491 A JP12222491 A JP 12222491A JP H04325353 A JPH04325353 A JP H04325353A
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- vibrator
- frequency
- outside mirror
- circuit
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 238000010408 sweeping Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は自動車用のアウトサイド
ミラーに関し、特に超音波振動子による超音波振動によ
って、ミラー表面に付着した水滴を飛散する事によって
良好な視界を得る様構成した水滴飛散装置付アウトサイ
ドミラーに関する。[Industrial Application Field] The present invention relates to an outside mirror for automobiles, and more particularly, to an outside mirror for automobiles, and more particularly, the present invention relates to a water droplet scattering system configured to obtain a good visibility by scattering water droplets attached to the mirror surface using ultrasonic vibrations caused by an ultrasonic vibrator. Regarding an outside mirror with a device.
【０００２】0002
【従来の技術】水滴飛散装置付アウトサイドミラーの構
成を図１に示す。ミラー１に超音波を発生する振動子２
を接着し、この振動子に信号発生回路５と増幅回路６か
ら成る駆動回路４により高周波の信号を入力し駆動して
いる。増幅回路６は従来は、図７に示すように電界効果
トランジスタ（ＦＥＴ）によるプッシュプル回路で構成
して信号を増幅し、トランス７により増幅回路６と振動
子２とのインピーダンスを整合し駆動している。水滴飛
散装置付アウトサイドミラーに於て振動子に加える周波
数を変え、振動子のインピーダンス特性を測定した結果
を図３に示す。図３に示すように３５ＫＨｚないし６５
ＫＨｚの間で励振周波数をスイープした時、５０ＫＨｚ
付近にインピーダンスが最小となる点があり、その前後
の周波数では複雑にインピーダンスが変化し、又駆動回
路からの出力電力を周波数をスイープして振動子に供給
しているので、振動子には各周波数に於けるインピーダ
ンスに追従してパワーが加えられている。この時増幅回
路の出力はＦＥＴのプッシュプル回路となっているため
電圧波形の対称性がよく、波形はより正弦波に近いため
特にインピーダンス最小の点で最もパワーが入力され、
水滴の飛散状態を見ると、インピーダンスが最小となる
周波数に於て振動振幅は際立って大きくなり、ミラー表
面上の水滴が霧状となって飛散するが、一部は再びミラ
ー面に付着し、結果としてミラー表面に付着した水滴の
除去する性能が低下するという欠点があった。2. Description of the Related Art FIG. 1 shows the structure of an outside mirror equipped with a water droplet scattering device. Vibrator 2 that generates ultrasonic waves on mirror 1
A high-frequency signal is inputted to this vibrator by a drive circuit 4 consisting of a signal generation circuit 5 and an amplifier circuit 6 to drive the vibrator. Conventionally, the amplifier circuit 6 is configured as a push-pull circuit using field effect transistors (FETs) as shown in FIG. 7 to amplify the signal, and a transformer 7 matches the impedances of the amplifier circuit 6 and the vibrator 2 and drives them. ing. Figure 3 shows the results of measuring the impedance characteristics of the vibrator by changing the frequency applied to the vibrator in the outside mirror with a water droplet scattering device. 35KHz to 65KHz as shown in Figure 3
When sweeping the excitation frequency between KHz, 50KHz
There is a point near which the impedance is minimum, and the impedance changes in a complicated manner at frequencies before and after that point.Also, since the output power from the drive circuit is supplied to the vibrator by sweeping the frequency, the vibrator has a Power is added following impedance at frequency. At this time, the output of the amplifier circuit is a FET push-pull circuit, so the voltage waveform has good symmetry, and the waveform is closer to a sine wave, so the most power is input especially at the point of minimum impedance.
Looking at the state of water droplet scattering, the vibration amplitude becomes significantly large at the frequency where the impedance is minimum, and the water droplets on the mirror surface scatter in the form of mist, but some of them adhere to the mirror surface again. As a result, there was a drawback that the ability to remove water droplets adhering to the mirror surface deteriorated.
【０００３】0003
【発明が解決しようとする課題】本発明はミラーの振動
姿態をミラーの面に垂直方向を主とする振動のみでなく
、ミラーの面に平行な振動姿態を持つよう駆動すること
により水滴の除去性能を向上させる事を目的とする。[Problems to be Solved by the Invention] The present invention aims to remove water droplets by driving the mirror to vibrate not only in a direction perpendicular to the surface of the mirror, but also in a direction parallel to the surface of the mirror. The purpose is to improve performance.
【０００４】0004
【課題を解決するための手段】本発明は、振動子と振動
伝達体とミラーから構成される複雑な振動系全体を、Ｆ
ＥＴのプッシプル駆動でなく単一のトランジスタで駆動
し、しかもトランスによる整合を最大振幅を示す主共振
周波数から低周波側にずらして整合するようにし、超音
波振動子と一緒に駆動されるミラーのアドミッタンス特
性において、虚数部が０で実数部が主たる共振点に於け
る値の２〜３倍の大きさの実数部を持つインピーダンス
を示す周波数に於て、駆動回路の出力インピーダンスを
振動系と整合させた回路条件で駆動する事を特徴とする
。[Means for Solving the Problems] The present invention provides an F
It is driven by a single transistor instead of the push-pull drive of ET, and the matching by the transformer is shifted from the main resonant frequency that exhibits the maximum amplitude to the lower frequency side. In admittance characteristics, the output impedance of the drive circuit is matched with the vibration system at a frequency where the imaginary part is 0 and the real part is 2 to 3 times larger than the value at the main resonance point. It is characterized by being driven under certain circuit conditions.
【０００５】即ち本発明は、ミラーを把持したミラーボ
デーと、該ミラーボデーを傾動自在に駆支したミラーハ
ウジングと、前記ミラーの背面に固着された振動子と、
前記ミラーハウジング内に配設され振動子に振動を付与
する信号発生回路及び増幅回路とを備えた水滴飛散装置
付アウトサイドミラーに於て、ミラーと一体に固着され
た前記振動子とミラーとの振動系を駆動するのに、増幅
回路の振動子駆動回路に単一のトランジスタを用い、増
幅回路と振動子とのインピーダンス整合を主共振周波数
に於けるインピーダンスよりずらし結合するよう構成し
た事を特徴とする水滴飛散装置付アウトサイドミラーで
ある。That is, the present invention comprises: a mirror body that holds a mirror; a mirror housing that drives and supports the mirror body in a freely tiltable manner; and a vibrator that is fixed to the back surface of the mirror.
In the outside mirror with a water droplet scattering device, which is disposed in the mirror housing and includes a signal generation circuit and an amplification circuit for imparting vibration to the vibrator, the vibrator and the mirror are integrally fixed to the mirror. To drive the vibration system, a single transistor is used in the resonator drive circuit of the amplifier circuit, and the impedance matching between the amplifier circuit and the resonator is shifted from the impedance at the main resonant frequency. This is an outside mirror with a water droplet scattering device.
【０００６】[0006]
【作用】水滴飛散装置付アウトサイドミラーの超音波振
動を付与する振動子は、ミラーの裏面に取り付けられて
いるが、超音波振動は振動子とミラーを含め一つの振動
系となっているため、アウトサイドミラーを３５ＫＨｚ
〜６５ＫＨｚで駆動する時は、スイープする周波数に於
ける共振を示すスプリアス特性が大きいが、従来はＦＥ
Ｔを用いたプッシュプル増幅回路を用いているため、超
音波の駆動波形がより正弦波に近く、主共振周波数で最
大の振幅を示し、霧状の雨滴がミラー面に付着し、ミラ
ー面を曇らせていた。本発明による水滴飛散装置付アウ
トサイドミラーでは振動子の駆動には単一のトランジス
タを用いた駆動であるため、振動子を励振する交流電圧
波形は非対称波となり高周波を含み、一方振動子と増幅
回路とを結合するトランスによる整合を粗にし、主共振
周波数に於けるインピーダンスに対しずらし、振動子と
アウトサイドミラーを含む振動系に対するアドミッタン
スループを求め主共振点以下の低い周波数の共振点にト
ランスによる振動系と駆動回路系とのインピーダンスの
整合を行うことにより、ミラーの表面に平行方向の振動
成分を大きくし、水滴飛散効率を向上する。[Operation] The vibrator that applies ultrasonic vibration to the outside mirror with water droplet scattering device is attached to the back of the mirror, but the ultrasonic vibration is a single vibration system that includes the vibrator and mirror. , outside mirror 35KHz
When driving at ~65KHz, there is a large spurious characteristic that shows resonance in the sweeping frequency, but conventionally, FE
Since a push-pull amplifier circuit using T is used, the ultrasonic drive waveform is closer to a sine wave and has the maximum amplitude at the main resonance frequency, causing mist raindrops to adhere to the mirror surface and cause the mirror surface to It was cloudy. In the outside mirror with a water droplet scattering device according to the present invention, the vibrator is driven using a single transistor, so the AC voltage waveform that excites the vibrator becomes an asymmetric wave and includes high frequencies, while the vibrator and amplification Roughly match the transformer that connects the circuit, shift the impedance at the main resonance frequency, find the admittance loop for the vibration system including the vibrator and the outside mirror, and install the transformer at the low frequency resonance point below the main resonance point. By matching the impedance between the vibration system and the drive circuit system, the vibration component in the direction parallel to the mirror surface is increased and the water droplet scattering efficiency is improved.
【０００７】[0007]
【実施例】以下本発明の実施例を図面を参照し説明する
。図１は本発明の実施例を示すミラーの断面図である。
ミラー１に振動子２が樹脂、又は半田等を用い接着され
る。図２は本発明による水滴飛散装置付アウトサイドミ
ラーの回路図を示し、振動子を励振スイープする周波数
を作る信号発生回路５は、増幅回路６を経て駆動用のト
ランジスタ８によりインピーダンス整合のためのトラン
ス７によりインピーダンス整合をし振動子２を駆動する
。この時、振動子を接着したアウトサイドミラーの励振
周波数に対するインピーダンス特性は図３に示す特性を
示し、又アドミッタンス特性は図４の様な特性を示す。
ここで駆動回路の出力トランスの巻線およびトランスの
磁性コアのキャップを調整すると、ミラーは図４のＡ点
付近で最も電力が供給される。本発明では主共振周波数
のＡの範囲よりずらし周波数の低い方でインピーダンス
を整合するよう構成してあるので、図３及び図４に示す
範囲Ａ及び範囲Ｂでの振動は、図５に示すミラー表面に
平行な（ａ）方向の振動であり、図６に示す様にミラー
１表面に付着した水滴を左右、上下に振動させる為、水
滴はミラー表面で集まり、やがて表面張力に打ちかち下
へ滴下するという効果が生まれる。一方従来の駆動その
ままの場合はＣ点で電力が供給され易く、これは図５に
示すミラー表面方向に対し垂直な（ｂ）方向の振動が主
成分となり、ミラー表面の水滴を前方へ押し出す効果と
なるが、その際水滴が霧状になる為、時によってはその
霧が再度ミラーに付着するという不具合にもなっており
、ミラーの表面の振動姿態をミラー面と平行方向に振動
する成分を主とした周波数による駆動により、水滴飛散
効果の高い水滴飛散装置付アウトサイドミラーとするこ
とが出来る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a mirror showing an embodiment of the present invention. A vibrator 2 is bonded to a mirror 1 using resin, solder, or the like. FIG. 2 shows a circuit diagram of an outside mirror with a water droplet scattering device according to the present invention, in which a signal generation circuit 5 that generates a frequency for exciting and sweeping a vibrator is connected to an amplifier circuit 6 and a driving transistor 8 for impedance matching. A transformer 7 performs impedance matching and drives the vibrator 2. At this time, the impedance characteristic with respect to the excitation frequency of the outside mirror to which the vibrator is bonded shows the characteristic shown in FIG. 3, and the admittance characteristic shows the characteristic as shown in FIG. 4. If the winding of the output transformer of the drive circuit and the cap of the magnetic core of the transformer are adjusted here, the mirror is supplied with the most power near point A in FIG. In the present invention, the impedance is matched at a shift frequency lower than the range A of the main resonant frequency, so vibrations in the range A and range B shown in FIGS. 3 and 4 are caused by the mirror shown in FIG. The vibration is in the direction (a) parallel to the surface, and as shown in Figure 6, the water droplets attached to the surface of mirror 1 are vibrated left and right and up and down, so the water droplets gather on the mirror surface and eventually hit the surface tension and move downward. A dripping effect is created. On the other hand, if the conventional drive is used as it is, power is easily supplied at point C, and this is due to the vibration in the direction (b) perpendicular to the mirror surface direction shown in Figure 5 being the main component, which has the effect of pushing water droplets on the mirror surface forward. However, at that time, the water droplets turn into mist, which sometimes causes problems such as the mist adhering to the mirror again. By driving based on the main frequency, it is possible to obtain an outside mirror with a water droplet scattering device that has a high water droplet scattering effect.
【０００８】[0008]
【発明の効果】以上述べたごとく、本発明による水滴飛
散装置付アウトサイドミラーにおいては、駆動回路の出
力インピーダンスをミラーのアドミッタンス特性の主共
振周波数より低い周波数域にインピーダンス整合するよ
う構成することにより、ミラーの上下、左右振動の強さ
を増し、前後方向の振動が弱まり、霧化した水滴がミラ
ー面に再付着することのない、しかも水滴の除去性能が
著しく向上した水滴飛散装置付アウトサイドミラーの供
給が可能となった。As described above, in the outside mirror with a water droplet scattering device according to the present invention, the output impedance of the drive circuit is impedance matched to a frequency range lower than the main resonant frequency of the admittance characteristic of the mirror. , the outside has a water droplet scattering device that increases the strength of the mirror's vertical and horizontal vibrations, weakens the longitudinal vibration, prevents atomized water droplets from re-attaching to the mirror surface, and significantly improves water droplet removal performance. We are now able to supply mirrors.
【図１】水滴飛散装置付アウトサイドミラーの一実施例
を示すブロック図。FIG. 1 is a block diagram showing an embodiment of an outside mirror with a water droplet scattering device.
【図２】本発明の超音波振動子を駆動する駆動回路、増
幅回路、駆動トランジスタ、トランスを示す回路図。FIG. 2 is a circuit diagram showing a drive circuit, an amplifier circuit, a drive transistor, and a transformer that drive the ultrasonic transducer of the present invention.
【図３】振動系の周波数インピーダンス特性。[Figure 3] Frequency impedance characteristics of the vibration system.
【図４】振動系の励振周波数を変えた時のアドミッタン
ス特性。[Figure 4] Admittance characteristics when changing the excitation frequency of the vibration system.
【図５】ミラー面振動姿態を示す断面図。FIG. 5 is a sectional view showing a mirror surface vibration state.
【図６】本発明の効果を説明する水滴の動きを示す平面
図。FIG. 6 is a plan view showing the movement of water droplets to explain the effects of the present invention.
【図７】従来の振動子の駆動回路図。FIG. 7 is a drive circuit diagram of a conventional vibrator.
【符号の説明】 １ ミラー ２ 振動子 ４ 駆動回路 ５ 信号発生回路 ６ 増幅回路 ７ トランス ８ トランジスタ ９ 水滴[Explanation of symbols] 1 Mirror 2. Oscillator 4 Drive circuit 5 Signal generation circuit 6 Amplifier circuit 7 Trance 8 Transistor 9 Water droplets
Claims (1)
ミラーボデーを傾動自在に駆支したミラーハウジングと
、前記ミラーの背面に固着された振動子と、前記ミラー
ハウジング内に配設され振動子に振動を付与する信号発
生回路及び増幅回路とを備えた水滴飛散装置付アウトサ
イドミラーに於て、ミラーと一体に固着された前記振動
子とミラーとの振動系を駆動するのに、増幅回路の振動
子駆動回路に単一のトランジスタを用い、増幅回路と振
動子とのインピーダンスの整合を粗にするとともに主共
振周波数に於けるインピーダンスよりずらし結合するよ
う構成した事を特徴とする水滴飛散装置付アウトサイド
ミラー。1. A mirror body that grips a mirror, a mirror housing that tiltably supports the mirror body, a vibrator fixed to the back surface of the mirror, and a vibrator disposed within the mirror housing. In an outside mirror with a water droplet scattering device that is equipped with a signal generation circuit that applies vibration and an amplifier circuit, an amplifier circuit is used to drive the vibration system of the mirror and the vibrator that is fixed integrally with the mirror. Equipped with a water droplet scattering device characterized in that a single transistor is used in the vibrator drive circuit, the impedance matching between the amplifier circuit and the vibrator is coarsely matched, and the impedance at the main resonance frequency is shifted from the coupling. outside mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3122224A JPH04325353A (en) | 1991-04-23 | 1991-04-23 | Outside mirror with waterdrop splashing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3122224A JPH04325353A (en) | 1991-04-23 | 1991-04-23 | Outside mirror with waterdrop splashing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04325353A true JPH04325353A (en) | 1992-11-13 |
Family
ID=14830637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3122224A Pending JPH04325353A (en) | 1991-04-23 | 1991-04-23 | Outside mirror with waterdrop splashing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04325353A (en) |
-
1991
- 1991-04-23 JP JP3122224A patent/JPH04325353A/en active Pending
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