JPH08295205A - Back mirror for vehicle - Google Patents
Back mirror for vehicleInfo
- Publication number
- JPH08295205A JPH08295205A JP7122940A JP12294095A JPH08295205A JP H08295205 A JPH08295205 A JP H08295205A JP 7122940 A JP7122940 A JP 7122940A JP 12294095 A JP12294095 A JP 12294095A JP H08295205 A JPH08295205 A JP H08295205A
- Authority
- JP
- Japan
- Prior art keywords
- electrode pattern
- electrode
- electrode patterns
- mirror
- heating element
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、車両に取り付けられる
後方視認用のバックミラーに係り、特に、鏡面に付着す
る水滴等を除去する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rearview rearview mirror mounted on a vehicle, and more particularly to a technique for removing water drops and the like adhering to a mirror surface.
【０００２】[0002]
【従来の技術】一般に、車両用のバックミラーは鏡面に
水滴、霧、霜等が付着して、ドライバーの後方視界が遮
られることがある。このような場合、その都度、ドライ
バーが車両から降りて水滴、霧、霜等の付着物を除去す
ることは非常に面倒であり、また、付着したままの状態
で走行を続けると安全性が損なわれる。そこで、従来よ
り、バックミラーの鏡面の裏側にヒータを配設し、該ヒ
ータに通電して鏡面に熱を加え、これによって鏡面に付
着した水滴、霧、霜等の付着物を除去する方法が提案さ
れている。2. Description of the Related Art Generally, a rearview mirror for a vehicle may have water drops, fog, frost or the like attached to the mirror surface thereof, thereby obstructing the rear view of the driver. In such a case, it is very troublesome for the driver to get out of the vehicle and remove adhering substances such as water droplets, fog, and frost each time, and if the driver continues to drive with the adhering substance, safety is impaired. Be done. Therefore, conventionally, there is a method of arranging a heater on the back side of the mirror surface of the rearview mirror and energizing the heater to apply heat to the mirror surface, thereby removing adhered substances such as water droplets, fog, and frost adhered to the mirror surface. Proposed.
【０００３】このような、バックミラーとして従来よ
り、実開昭６０−３２１４６号マイクロフィルム（以
下、従来例１という）、実開昭６２−１２３４５０号マ
イクロフィルム（以下、従来例２という）等が知られて
いる。このうち、従来例１に記載されている技術は、図
７に示すように加温用ヒータ１１と保温用ヒータ１２と
をそれぞれ矩形波状に配線し、保温時にはリード線１
４、１５を介して保温用ヒータ１２に電圧を供給し、加
温時にはサーモスタット１３を介して加温用ヒータ１１
に電源を供給することによってバックミラー鏡面の加熱
を行っている。また、従来例２に記載されている技術
は、リヤデフォッガ、室内ヒータ、及びワイパのうちい
づれか１つが動作した際にこれに連動してミラーヒータ
が通電するものである。Conventionally, as the rearview mirror, there have been used, for example, a real film No. 60-32146 (hereinafter referred to as a conventional example 1), a real film No. 62-123450 (hereinafter referred to as a conventional example 2) and the like. Are known. Among them, in the technique described in Conventional Example 1, as shown in FIG. 7, the heating heater 11 and the heat retaining heater 12 are wired in a rectangular wave shape, respectively, and the lead wire 1 is used during the heat retaining.
A voltage is supplied to the heater 12 for warming through the heaters 4 and 15, and the heater 11 for warming is heated through the thermostat 13 during heating.
The mirror surface of the rearview mirror is heated by supplying power to. In addition, in the technique described in the second conventional example, when any one of the rear defogger, the indoor heater, and the wiper operates, the mirror heater is energized in conjunction with the operation.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述し
た従来例１に記載されたものは、電熱抵抗体にて構成さ
れた加温用ヒータ１１、保温用ヒータ１２を用いて線状
に発熱させているので、鏡面全体を均一に加熱すること
が困難であり、加温時と保温時との温度分布の差が大き
く、発熱面積も異なる。また、鏡面全体に均一に加熱し
ようとして、電熱抵抗体を密に配線すると電熱抵抗体の
長さが非常に長くなり、配線構造が極めて複雑となって
しまう。また、サーモスタット１３を用いて加温用ヒー
タ１１のオン、オフを切り換えているので、バッテリの
負荷の大きさに関係なく、鏡面の温度が低いときに加温
用ヒータ１１がオンとなり加熱を行うので、ヘッドラン
プやエアコン等を使用している際にはバッテリが過負荷
となってしまうことがある。However, in the one described in the above-mentioned conventional example 1, the heater 11 for heating and the heater 12 for warming which are composed of the electrothermal resistor are used to generate linear heat. Since it is difficult to uniformly heat the entire mirror surface, there is a large difference in the temperature distribution between the time of heating and the time of heat retention, and the heating area is also different. Further, if the electrothermal resistor is densely wired in order to uniformly heat the entire mirror surface, the length of the electrothermal resistor becomes very long, and the wiring structure becomes extremely complicated. Further, since the heating heater 11 is switched on and off using the thermostat 13, the heating heater 11 is turned on to perform heating when the temperature of the mirror surface is low, regardless of the load of the battery. Therefore, the battery may be overloaded when using a headlight, an air conditioner, or the like.
【０００５】また、従来例２に記載されたものにおいて
は、ワイパー、リヤデフォッガ、室内ヒータ等と連動さ
せると、操作性は向上するが、反面、バッテリの負荷が
過多となってしまうことがあり、バッテリやオルタネー
タの容量を大きくせざるを得ないという欠点がある。こ
の発明はこのような従来の課題を解決するためになされ
たものであり、その目的とするところは、バッテリに大
きな負荷をかけることなく、且つ、鏡面全体を均一に、
必要な時に素早く加熱することのできる車両用バックミ
ラーを提供することにある。Further, in the one described in the conventional example 2, when the wiper, the rear defogger, the indoor heater and the like are interlocked, the operability is improved, but on the other hand, the load of the battery may become excessive. However, there is a drawback that the capacity of the battery and the alternator must be increased. The present invention has been made to solve such a conventional problem, and an object thereof is to apply a large load to a battery, and to make the entire mirror surface uniform,
It is to provide a rearview mirror for a vehicle that can be heated quickly when needed.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
本発明は、車両の前方側面に突起して設けられ、後方視
認用の鏡面が取り付けられる車両用バックミラーにおい
て、前記鏡面の裏面側に平面状に取り付けられ、通電に
より発熱する発熱素子と、当該発熱素子の一方の面上に
配置され、導電体で構成される第１の電極パターン及び
該第１の電極パターンとは所定距離離れて配置される第
２の電極パターンと、前記発熱素子の他方の面上に配置
され、導電体で構成される第３の電極パターン及び該第
３の電極パターンとは所定距離離れて配置される第４の
電極パターンと、前記第１（第２）の電極パターン、前
記第３（第４）の電極パターンのうち少なくとも一方を
電源電位とし、前記第２（第１）の電極パターン、前記
第４（第３）の電極パターンのうち少なくとも一方をグ
ランド電位として電圧を印加する電源手段と、前記電圧
印加のオン・オフを切り換えるスイッチ手段と、を有す
ることが特徴である。In order to achieve the above object, the present invention is a rearview mirror for a vehicle, which is provided on a front side surface of a vehicle so as to project and a rear-view mirror surface is attached to the rear surface side of the mirror surface. A heating element that is mounted in a plane and that generates heat when energized, a first electrode pattern that is disposed on one surface of the heating element, and that is made of a conductor, and the first electrode pattern are separated by a predetermined distance. A second electrode pattern to be arranged, a third electrode pattern which is arranged on the other surface of the heating element and is made of a conductor, and a third electrode pattern which is arranged apart from the third electrode pattern by a predetermined distance. At least one of a fourth electrode pattern, the first (second) electrode pattern, and the third (fourth) electrode pattern as a power supply potential, and the second (first) electrode pattern, the fourth electrode pattern. (Third) power A power supply means for applying a voltage to at least one as a ground potential of the pattern, is characterized with, a switching means for switching the voltage application on and off.
【０００７】[0007]
【作用】上述の如く構成された本発明によれば、第１，
第２の電極パターンの間隔と、第３，第４の電極パター
ンの間隔とが異なるように配置することにより、どちら
の電極パターン間に電圧を印加するかを選択すること
で、発熱量を切り換えることができる。即ち、間隔の狭
い方の電極パターン間に電圧を印加すれば発熱量は大き
くなり、鏡面に付着した水滴等を即時に除去することが
できる。反対に、間隔の広い方の電極パターン間に電圧
を印加すれば、発熱量は小さくなるので付着物を除去す
る速度は遅くなるが、バッテリへの負荷が軽減されるの
で、エアコンやヘッドランプを使用しているときでも、
バッテリに大きな負担をかけることはない。According to the present invention constructed as described above,
The distance between the second electrode patterns and the distance between the third and fourth electrode patterns are arranged so as to be different from each other, whereby the amount of heat generation is switched by selecting which of the electrode patterns the voltage is applied to. be able to. That is, when a voltage is applied between the electrode patterns with the narrower intervals, the amount of heat generated increases, and water droplets or the like attached to the mirror surface can be immediately removed. On the other hand, if a voltage is applied between the electrode patterns with wider intervals, the amount of heat generated will be smaller, and the speed of removing adhered substances will be slower, but the load on the battery will be reduced, so it will Even when using
It does not put a heavy load on the battery.
【０００８】また、第１，第２の電極パターン間と第
３，第４の電極パターン間との間隔を同一とし、発熱量
を大きくしたいときには両面の電極パターン間に電圧を
印加し、発熱量を小さくしたいときにはどちらか一方の
面の電極パターン間に電圧を印加することも可能であ
る。このような方法を用いても、上記と同様に発熱量が
大きく水滴等の除去効率が高いモードと、発熱量が小さ
く消費電力を押さえるモードとに切り換えることができ
る。When it is desired to increase the amount of heat generated by making the distance between the first and second electrode patterns the same as that between the third and fourth electrode patterns, a voltage is applied between the electrode patterns on both sides to generate the amount of heat. It is also possible to apply a voltage between the electrode patterns on either one of the surfaces when it is desired to reduce. Even if such a method is used, it is possible to switch between a mode in which the amount of heat generated is large and the efficiency of removing water drops and the like is high, and a mode in which the amount of heat generated is small and power consumption is suppressed, as in the above case.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は本発明が適用される車両用バックミラーの
概略的な構成を示す説明図であり、図示のようにこのバ
ックミラーは後方視認用の鏡面としてのＣｒ裏面鏡１の
裏面に、該Ｃｒ裏面鏡１を加熱するためのＰＴＣ(posit
ive temperature coefficient)ヒータ２が配設されてい
る。ＰＴＣヒータ２はオレフィン系等の樹脂に導電粒子
（カーボン等）を混合させ、発熱体として用いたもので
あり、温度上昇に対して電気抵抗値が増加する特性を有
している。そして、該ＰＴＣヒータ２は可とう性をもつ
平面形状を成し、後述するようにＰＴＣ発熱体８の両面
に電極パターン６が配置されて構成される。また、この
電極パターン６は接続端子７，接続線３を介してスイッ
チ装置４に接続され、更に該スイッチ装置４はバッテリ
５と接続され、これによって電極パターン６に電圧が印
加されるようになっている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a schematic configuration of a vehicle rearview mirror to which the present invention is applied. As shown in the figure, this rearview mirror is provided on the rear surface of a Cr rear surface mirror 1 as a mirror surface for rearward visual recognition. PTC (posit for heating the backside mirror 1
A heater 2 is provided. The PTC heater 2 is used as a heating element by mixing conductive particles (carbon or the like) with an olefin resin or the like, and has a characteristic that the electric resistance value increases with increasing temperature. Further, the PTC heater 2 has a flexible planar shape, and the electrode patterns 6 are arranged on both surfaces of the PTC heating element 8 as described later. Further, the electrode pattern 6 is connected to the switch device 4 via the connection terminal 7 and the connection line 3, and the switch device 4 is further connected to the battery 5, whereby a voltage is applied to the electrode pattern 6. ing.
【００１０】図２は、本発明の第１実施例に係るＰＴＣ
ヒータ２の詳細な構成を示す説明図であり、同図（ａ）
は裏面、（ｂ）は側面、（ｃ）は表面を示している。同
図（ａ）に示すように、ＰＴＣヒータ２の裏面側には櫛
歯状に形成された第３の電極パターン６ｃ及び第４の電
極パターン６ｄが千鳥状に相対峙して配置されており、
各電極パターン６ｃ，６ｄの櫛歯の部分は間隔ｗ１だけ
離れている。また、各電極パターン６ｃ，６ｄは、それ
ぞれＰＴＣ発熱体８上の一方の短い辺側に配置された接
続端子７ｃ，７ｄと接続されており、該接続端子７ｃ，
７ｄを介して図１に示したバッテリ５，スイッチ装置４
から電圧が印加されるようになっている。また、他方の
短い辺側には、図２（ｃ）に示す表面側の電極パターン
６ａ、６ｂと接続するための接続端子７ａ，７ｂが配置
されており、ＰＴＣ発熱体８を貫通して表面側の第１の
電極パターン６ａ、第２の電極パターン６ｂと接続され
るようになっている。FIG. 2 shows a PTC according to the first embodiment of the present invention.
It is explanatory drawing which shows the detailed structure of the heater 2, and FIG.
Shows the back surface, (b) shows the side surface, and (c) shows the front surface. As shown in FIG. 3A, the third electrode pattern 6c and the fourth electrode pattern 6d formed in a comb shape are arranged on the back side of the PTC heater 2 in a zigzag pattern. ,
The comb teeth of the electrode patterns 6c and 6d are separated by a distance w1. The electrode patterns 6c and 6d are connected to the connection terminals 7c and 7d arranged on one short side of the PTC heating element 8, respectively.
The battery 5 and the switch device 4 shown in FIG.
The voltage is applied from. Also, on the other short side, connection terminals 7a and 7b for connecting to the electrode patterns 6a and 6b on the surface side shown in FIG. 2C are arranged, and penetrate the PTC heating element 8 to penetrate the surface. The first side electrode pattern 6a and the second side electrode pattern 6b are connected to each other.
【００１１】ＰＴＣヒータの表面は裏面と略同様である
が、櫛歯状の第１，第２の電極パターン６ａ，６ｂの櫛
歯が第３，第４の電極パターン６ｃ，６ｄの櫛歯よりも
密に構成されている点で異なる。従って、第１，第２の
電極パターン６ａ，６ｂ間の距離ｗ２は前記した第３，
第４の電極パターン６ｃ，６ｄの間隔ｗ１よりも小さく
なっている。そして、各電極パターン６ａ〜６ｄが配置
されたＰＴＣヒータ２全体は、樹脂フィルム９にて覆設
され、外部と絶縁されると共に防水されている。The front surface of the PTC heater is almost the same as the back surface, but the comb teeth of the comb-shaped first and second electrode patterns 6a and 6b are more than the comb teeth of the third and fourth electrode patterns 6c and 6d. Also differs in that they are densely structured. Therefore, the distance w2 between the first and second electrode patterns 6a and 6b is equal to
It is smaller than the distance w1 between the fourth electrode patterns 6c and 6d. The entire PTC heater 2 on which the electrode patterns 6a to 6d are arranged is covered with a resin film 9 to be insulated from the outside and waterproof.
【００１２】次に、上記の如く構成された本実施例の動
作について以下に説明する。本実施例では、ＰＴＣヒー
タ２の裏面側の電極パターン６ｃ，６ｄに電圧を印加し
て発熱させる低消費電力モードと、表面側の電極パター
ン６ａ，６ｂに電圧を印加して発熱させる高性能モード
の２種類の発熱モードを適宜切り換えて鏡面に付着した
水滴等を除去する。Next, the operation of this embodiment constructed as described above will be described below. In this embodiment, a low power consumption mode in which a voltage is applied to the back side electrode patterns 6c and 6d of the PTC heater 2 to generate heat and a high performance mode in which a voltage is applied to the front side electrode patterns 6a and 6b to generate heat. The two types of heat generation modes are appropriately switched to remove water drops and the like adhering to the mirror surface.
【００１３】図３は、ＰＴＣヒータ２の断面を模式的に
示した説明図であり、図示のようにＰＴＣヒータ２の裏
面には第３の電極パターン６ｃと第４の電極パターン６
ｄとが間隔ｗ１だけ隔て配置されている。そして、図１
に示すスイッチ装置４を操作して第３の電極パターン６
ｃをグランド電位、第４の電極パターン６ｄを電源電位
（通常１２Ｖ）とすると、第４の電極パターン６ｄ側か
ら第３の電極パターン６ｃ側に電流が流れ、これによ
り、ＰＴＣ発熱体８が発熱し図１に示すＣｒ裏面鏡１が
加熱されるので、該Ｃｒ裏面鏡１の表面に付着した水滴
等を除去することができる。FIG. 3 is an explanatory view schematically showing the cross section of the PTC heater 2, and as shown in the figure, the third electrode pattern 6c and the fourth electrode pattern 6 are formed on the back surface of the PTC heater 2.
It is arranged at a distance w1 from d. And FIG.
The switch device 4 shown in FIG.
When c is the ground potential and the fourth electrode pattern 6d is the power supply potential (normally 12 V), a current flows from the fourth electrode pattern 6d side to the third electrode pattern 6c side, which causes the PTC heating element 8 to generate heat. Since the Cr back surface mirror 1 shown in FIG. 1 is heated, water droplets and the like attached to the surface of the Cr back surface mirror 1 can be removed.
【００１４】また、ＰＴＣヒータ２の表面側には、第１
の電極パターン６ａと第２の電極パターン６ｂが距離ｗ
２（ｗ２＜ｗ１）だけ隔てて交互に配置されている。そ
して、前記した裏面の場合と同様に図１に示すスイッチ
装置４を操作することにより、第１の電極パターン６ａ
をグランド電位、第２の電極パターン６ｂを電源電位と
すると、第２の電極パターン６ｂ側から第１の電極パタ
ーン６ａ側に電流が流れ、ＰＴＣ発熱体８が発熱する。
この際、表面側の方が電源、グランドの各電極パターン
の間隔が狭いので（ｗ２＜ｗ１）、抵抗値が小さくなり
電流値は大きくなる。従って、表面側の第１，第２の電
極パターン６ａ，６ｂ間に電圧を印加した方が裏面側の
第３，第４の電極パターン６ｃ，６ｄ間に電圧を印加し
た時よりも発熱量が大きくなり、図１に示したＣｒ裏面
鏡１に付着した水滴等を除去する効率が向上することに
なる。On the surface side of the PTC heater 2, the first
Electrode pattern 6a and second electrode pattern 6b are separated by a distance w
They are arranged alternately by 2 (w2 <w1). Then, by operating the switch device 4 shown in FIG. 1 as in the case of the back surface described above, the first electrode pattern 6a is formed.
Is the ground potential and the second electrode pattern 6b is the power supply potential, a current flows from the second electrode pattern 6b side to the first electrode pattern 6a side, and the PTC heating element 8 generates heat.
At this time, since the distance between the electrode patterns of the power supply and the ground is narrower on the surface side (w2 <w1), the resistance value becomes smaller and the current value becomes larger. Therefore, when the voltage is applied between the first and second electrode patterns 6a and 6b on the front surface side, the heat generation amount is larger than when the voltage is applied between the third and fourth electrode patterns 6c and 6d on the back surface side. As a result, the efficiency of removing water droplets and the like adhering to the Cr backside mirror 1 shown in FIG. 1 is improved.
【００１５】つまり、第１，第２の電極パターン間６
ａ，６ｂに電圧を印加するモードを高性能モードとし、
第３，第４の電極パターン６ｃ，６ｄ間に電圧を印加す
るモードを低消費電力モードとすれば、エアコンやヘッ
ドランプ等を使用している際には低消費電力モードとす
ることにより、バッテリへの負担を軽減させることがで
き、一方、エンジン始動時や停車時等、鏡面に付着する
水滴等の量が多いときには高性能モードとすることによ
り、素早く水滴等を除去することができるようになる。
そして、このような操作は、図１に示したスイッチ装置
４を操作することにより、容易に行うことができる。That is, between the first and second electrode patterns 6
The mode for applying voltage to a and 6b is the high-performance mode,
If the mode for applying the voltage between the third and fourth electrode patterns 6c and 6d is set to the low power consumption mode, the battery can be set to the low power consumption mode when using an air conditioner, a headlamp or the like. On the other hand, on the other hand, when the amount of water droplets etc. adhering to the mirror surface is large, such as when the engine is started or stopped, the high performance mode can be used to quickly remove water droplets etc. Become.
Then, such an operation can be easily performed by operating the switch device 4 shown in FIG.
【００１６】図４（ａ）は、高性能モード時における電
流値と鏡面温度との関係を示す特性図であり、同図
（ｂ）は、低消費電力モードにおける電流値と鏡面温度
との関係を示す特性図である。同図（ａ）から理解でき
るように、高性能モードにおいては定常時に約２アンペ
ア程度の電流が流れ、鏡面の温度は約６０度程度まで上
昇する。また、低消費電力モードにおいては、同図
（ｂ）に示すように定常時に約１アンペアの電流が流
れ、鏡面は約５０度程度まで上昇する。FIG. 4A is a characteristic diagram showing the relationship between the current value and the mirror surface temperature in the high performance mode, and FIG. 4B is the relationship between the current value and the mirror surface temperature in the low power consumption mode. FIG. As can be seen from FIG. 9A, in the high performance mode, a current of about 2 amps flows in a steady state, and the temperature of the mirror surface rises to about 60 degrees. Further, in the low power consumption mode, a current of about 1 ampere flows in a steady state and the mirror surface rises to about 50 degrees as shown in FIG.
【００１７】図５は、低消費電力モードと高性能モード
とを運転状況に応じて切り換えたときの鏡面温度と電流
値の変化を示す特性図であり、例えば、雨天のエンジン
始動時には鏡面に水滴等が多く付着しているので高性能
モードとして鏡面温度を高くし、走行時には低消費電力
モードとしてバッテリ５の負担を軽減させる。また、車
両が停止した際には、エンジン始動時と同様に水滴等の
付着量が多いので、再度高性能モードとして、鏡面温度
を上昇させる。FIG. 5 is a characteristic diagram showing changes in the mirror surface temperature and the current value when the low power consumption mode and the high performance mode are switched according to the operating condition. For example, when the engine is started in rainy weather, water drops are reflected on the mirror surface. Since a large amount of the like is attached, the mirror surface temperature is raised as a high performance mode, and the load on the battery 5 is reduced during traveling by using a low power consumption mode. Further, when the vehicle is stopped, the amount of water droplets and the like attached is large as in the case of starting the engine, so the mirror surface temperature is raised again in the high performance mode.
【００１８】このようなモードの切り換え操作は手動に
て行うこともできるが、予め設定した条件で自動切り換
えてもよい。即ち、エアコン，ヘッドランプが動作して
いるときには自動で低消費電力モードとなるように設定
してもよいし、また、高性能モードはエンジン始動時や
停車時等の水滴等の付着が多いときに使用することが望
ましいので、エンジン始動時や停車時の信号を検出し、
この検出信号に基づいて自動で高性能モードに切り換え
るようにしてもよい。なお、このような切り換え操作は
周知の技術で容易に達成可能であるのでここでは詳細に
説明しない。Although such a mode switching operation can be performed manually, it may be automatically switched under preset conditions. That is, the low power consumption mode may be automatically set when the air conditioner and the headlights are operating, and the high performance mode is used when there are many water drops such as when the engine is started or stopped. Since it is desirable to use it for detecting the signal when the engine is started or stopped,
You may make it switch to a high performance mode automatically based on this detection signal. Since such a switching operation can be easily achieved by a known technique, it will not be described in detail here.
【００１９】このようにして、本実施例では、ＰＴＣ発
熱体８の両面にそれぞれ電源、グランド間距離の異なる
電極パターンを配置し、表面または裏面のいづれかの電
極パターン間に電圧を印加することにより発熱量を変化
させ、低消費電力モードと高性能モードとを切り換える
ようにしている。従って、運転状況に応じたモードで水
滴等の除去を行うことができるようになり、このため、
バッテリやオルタネータの容量を大きくする必要はな
く、また、水滴等の付着量が多いときには即時にこれを
除去することができるようになる。また、平面状のＰＴ
Ｃ発熱体８を使用しているので、鏡面を均一に加熱する
ことができる。As described above, in this embodiment, electrode patterns having different distances between the power source and the ground are arranged on both surfaces of the PTC heating element 8 and a voltage is applied between the electrode patterns on either the front surface or the back surface. The heat generation amount is changed to switch between the low power consumption mode and the high performance mode. Therefore, it becomes possible to remove water drops and the like in a mode according to the driving situation, and therefore,
It is not necessary to increase the capacity of the battery or alternator, and when the amount of water drops or the like attached is large, it is possible to immediately remove them. In addition, flat PT
Since the C heating element 8 is used, the mirror surface can be heated uniformly.
【００２０】なお、上記した第１実施例では、ＰＴＣ発
熱体８の裏面側の電極パターン６ｃ，６ｄ間を広くし、
表面側の電極パターン６ａ，６ｂ間を狭くする例につい
て説明したが、これらは、勿論反対でもよい。即ち、裏
面側の電極パターン６ｃ，６ｄ間を狭くし、表面側の電
極パターン６ａ，６ｂ間を広くして、表面側通電時を低
消費電力モード、裏面側通電時を高性能モードとしても
よい。In the first embodiment described above, the space between the electrode patterns 6c and 6d on the back side of the PTC heating element 8 is widened,
The example in which the space between the electrode patterns 6a and 6b on the front surface side is narrowed has been described, but these may of course be reversed. That is, the space between the electrode patterns 6c and 6d on the back surface side may be narrowed and the space between the electrode patterns 6a and 6b on the front surface side may be widened so that the front surface side energization may be the low power consumption mode and the back surface side energization may be the high performance mode. .
【００２１】図６は、本発明の第２実施例を示す説明図
である。図示のように、この第２実施例では、裏面側と
表面側とで電極パターン間の距離が同一となっている。
即ち、図２に示した第１，第２の電極パターン６ａ，６
ｂ間と第３，第４の電極パターン６ｃ，６ｄ間のそれぞ
れの距離を同一とし（ｗ１＝ｗ２）、低消費電力モード
とするときには表面、または裏面のうちいづれか一方に
電圧を印加し、高性能モードとする際には表面及び裏面
の双方に電圧を印加する。FIG. 6 is an explanatory view showing the second embodiment of the present invention. As shown, in the second embodiment, the distance between the electrode patterns is the same on the back surface side and the front surface side.
That is, the first and second electrode patterns 6a, 6 shown in FIG.
b and the third and fourth electrode patterns 6c and 6d have the same distance (w1 = w2), and when the low power consumption mode is set, a voltage is applied to either the front surface or the back surface, In the performance mode, voltage is applied to both the front surface and the back surface.
【００２２】そして、このような構成においても前記し
た第１実施例と同様な効果が得られるとともに、表面と
裏面の電極パターンが同一となるので製作が容易とな
り、コストの低減を図ることができるようになる。ま
た、上記第１，第２実施例の変形例として、図２に示し
た表面側、及び裏面側のそれぞれの面でグランド電位と
される電極パターンどうしを接続することも可能であ
る。この場合においては、図１に示す接続線３の本数を
少なくすることができるようになる。Even in such a structure, the same effect as that of the first embodiment can be obtained, and since the electrode patterns on the front surface and the back surface are the same, the manufacture is easy and the cost can be reduced. Like Further, as a modified example of the first and second embodiments, it is possible to connect the electrode patterns having the ground potential on the front surface side and the back surface side shown in FIG. In this case, the number of connecting lines 3 shown in FIG. 1 can be reduced.
【００２３】[0023]
【発明の効果】以上説明したように、本発明によれば、
低消費電力モードと高性能モードとを切り換えてＰＴＣ
発熱体等の発熱素子を発熱させることができるので、鏡
面に付着する水滴等の量が多いときには高性能モードと
することにより、即時に付着物を除去することができる
ようになり、また、エアコンやヘッドランプ使用時等、
電源手段の負荷が大きいときには低消費電力モードとす
ることにより、電源負荷を軽減することができる。従っ
て、電源手段の容量を大きくしたり、オルタネータの容
量を大きくする必要はない。As described above, according to the present invention,
PTC by switching between low power consumption mode and high performance mode
Since a heating element such as a heating element can generate heat, when a large amount of water droplets and the like adhere to the mirror surface, a high performance mode can be used to immediately remove the deposits. Or when using headlamps,
When the load of the power supply means is large, the power supply load can be reduced by setting the low power consumption mode. Therefore, it is not necessary to increase the capacity of the power supply means or the capacity of the alternator.
【００２４】また、従来のように抵抗値の異なる２種類
のヒータを使用する必要はなく低コスト化を図ることが
でき、かつ、平面状の発熱素子を使用するので鏡面全体
を均一に加熱することができる。更に、発熱素子として
ＰＴＣ面状発熱体を用いると温度制御素子が不要であ
り、より一層の低コスト化を図ることができる。また、
グランド電位とされる電極パターンどうしを接続して共
通とすれば、配線数を一つ減らすことができるようにな
る。Further, unlike the conventional case, it is not necessary to use two kinds of heaters having different resistance values, the cost can be reduced, and since the flat heating element is used, the entire mirror surface is uniformly heated. be able to. Further, when the PTC sheet heating element is used as the heating element, the temperature control element is unnecessary, and the cost can be further reduced. Also,
The number of wirings can be reduced by one by connecting the electrode patterns having the ground potential to be common.
【図１】本発明に係る車両用バックミラーの概略的な構
成を示す説明図。FIG. 1 is an explanatory diagram showing a schematic configuration of a vehicle rearview mirror according to the present invention.
【図２】本発明の第１実施例に係るＰＴＣヒータの裏
面、側面及び表面を示す説明図。FIG. 2 is an explanatory view showing a back surface, a side surface, and a front surface of the PTC heater according to the first embodiment of the present invention.
【図３】第１実施例に係る電極パターンの配置を示す説
明図。FIG. 3 is an explanatory diagram showing an arrangement of electrode patterns according to the first embodiment.
【図４】高性能モード時と低消費電力モード時の鏡面温
度と電流値の時間変化を示す特性図。FIG. 4 is a characteristic diagram showing temporal changes in mirror surface temperature and current value in a high performance mode and a low power consumption mode.
【図５】高性能モードと低消費電力モードとを適宜切り
換えたときの鏡面温度変化及び電流値の変化を示す特性
図。FIG. 5 is a characteristic diagram showing a change in mirror surface temperature and a change in current value when the high performance mode and the low power consumption mode are appropriately switched.
【図６】本発明の第２実施例に係る電極パターンの配置
を示す説明図。FIG. 6 is an explanatory view showing the arrangement of electrode patterns according to the second embodiment of the present invention.
【図７】従来例に係る加温用ヒータと保温用ヒータの配
線を示す説明図。FIG. 7 is an explanatory diagram showing wiring of a heating heater and a heat retaining heater according to a conventional example.
１ Ｃｒ裏面鏡 ２ ＰＴＣヒータ ３ 接続線 ４ スイッチ装置 ５ バッテリ ６ 電極パターン ６ａ 第１の電極パターン ６ｂ 第２の電極パターン ６ｃ 第３の電極パターン ６ｄ 第４の電極パターン ７（７ａ〜７ｂ） 接続端子 ８ ＰＴＣ発熱体 ９ 樹脂フィルム 1 Cr Rear Mirror 2 PTC Heater 3 Connection Line 4 Switch Device 5 Battery 6 Electrode Pattern 6a First Electrode Pattern 6b Second Electrode Pattern 6c Third Electrode Pattern 6d Fourth Electrode Pattern 7 (7a to 7b) Connection Terminal 8 PTC heating element 9 Resin film
Claims (6)
方視認用の鏡面が取り付けられる車両用バックミラーに
おいて、 前記鏡面の裏面側に平面状に取り付けられ、通電により
発熱する発熱素子と、 当該発熱素子の一方の面上に配置され、導電体で構成さ
れる第１の電極パターン及び該第１の電極パターンとは
所定距離離れて配置される第２の電極パターンと、 前記発熱素子の他方の面上に配置され、導電体で構成さ
れる第３の電極パターン及び該第３の電極パターンとは
所定距離離れて配置される第４の電極パターンと、 前記第１（第２）の電極パターン、前記第３（第４）の
電極パターンのうち少なくとも一方を電源電位とし、前
記第２（第１）の電極パターン、前記第４（第３）の電
極パターンのうち少なくとも一方をグランド電位として
電圧を印加する電源手段と、 前記電圧印加のオン・オフを切り換えるスイッチ手段
と、 を有することを特徴とする車両用バックミラー。1. A rear-view mirror for a vehicle, which is provided on a front side surface of a vehicle so as to project and has a mirror surface for rearward viewing attached, wherein the heating element is mounted flat on the back surface side of the mirror surface and generates heat when energized. A first electrode pattern that is disposed on one surface of the heating element and is formed of a conductor, and a second electrode pattern that is spaced apart from the first electrode pattern by a predetermined distance; A third electrode pattern formed on the other surface and formed of a conductor; and a fourth electrode pattern arranged at a predetermined distance from the third electrode pattern; and the first (second) At least one of the electrode pattern and the third (fourth) electrode pattern is set to the power supply potential, and at least one of the second (first) electrode pattern and the fourth (third) electrode pattern is set to the ground potential. Vehicle rearview mirror, characterized in that it comprises and a power supply means for applying a voltage, and a switching means for switching the voltage application on and off.
れぞれ櫛型を成し、第１と第２の電極パターン、及び第
３と第４の電極パターンはそれぞれ千鳥状に櫛歯が対向
して配置されることを特徴とする請求項１記載の車両用
バックミラー。2. The first to fourth electrode patterns each have a comb shape, and the first and second electrode patterns and the third and fourth electrode patterns have zigzag-shaped comb teeth opposed to each other. The rear-view mirror for a vehicle according to claim 1, wherein the rear-view mirror is arranged in the same manner.
ターン間距離と他方の面における電極パターン間距離と
が異なることを特徴とする請求項１または２記載の車両
用バックミラー。3. The rear-view mirror for a vehicle according to claim 1, wherein the distance between the electrode patterns on one surface of the heating element is different from the distance between the electrode patterns on the other surface.
された発熱素子を樹脂フィルムにて覆設したことを特徴
とする請求項１乃至３記載の車両用バックミラー。4. The rear-view mirror for a vehicle according to claim 1, wherein the heating element on which the first to fourth electrode patterns are arranged is covered with a resin film.
と他方の面のグランド電極とを接続したことを特徴とす
る請求項１乃至４記載の車両用バックミラー。5. The rear-view mirror for a vehicle according to claim 1, wherein a ground electrode on one surface of the heating element and a ground electrode on the other surface are connected to each other.
記発熱素子は、樹脂フィルム上に積層されたＰＴＣ面状
発熱体にて構成されることを特徴とする請求項１乃至５
記載の車両用バックミラー。6. The first to fourth electrode patterns and the heating element are composed of a PTC planar heating element laminated on a resin film.
The vehicle rearview mirror described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7122940A JP3022252B2 (en) | 1995-04-25 | 1995-04-25 | Rearview mirror for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7122940A JP3022252B2 (en) | 1995-04-25 | 1995-04-25 | Rearview mirror for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08295205A true JPH08295205A (en) | 1996-11-12 |
| JP3022252B2 JP3022252B2 (en) | 2000-03-15 |
Family
ID=14848383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7122940A Expired - Fee Related JP3022252B2 (en) | 1995-04-25 | 1995-04-25 | Rearview mirror for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3022252B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009266631A (en) * | 2008-04-25 | 2009-11-12 | Panasonic Corp | Polymer exothermic body |
| CN106740486A (en) * | 2016-12-09 | 2017-05-31 | 徐浩 | A kind of side mirror |
-
1995
- 1995-04-25 JP JP7122940A patent/JP3022252B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009266631A (en) * | 2008-04-25 | 2009-11-12 | Panasonic Corp | Polymer exothermic body |
| CN106740486A (en) * | 2016-12-09 | 2017-05-31 | 徐浩 | A kind of side mirror |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3022252B2 (en) | 2000-03-15 |
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