JPH0799083A - Sheet-like heating element for mirror - Google Patents
Sheet-like heating element for mirrorInfo
- Publication number
- JPH0799083A JPH0799083A JP6117916A JP11791694A JPH0799083A JP H0799083 A JPH0799083 A JP H0799083A JP 6117916 A JP6117916 A JP 6117916A JP 11791694 A JP11791694 A JP 11791694A JP H0799083 A JPH0799083 A JP H0799083A
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- electrodes
- electrode
- insulating sheet
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
- H05B2203/006—Heaters using a particular layout for the resistive material or resistive elements using interdigitated electrodes
Landscapes
- Surface Heating Bodies (AREA)
- Resistance Heating (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はミラー用面状発熱体に
関し、特にその発熱領域をミラーの周縁にできるだけ近
付けると共にミラーの温度分布を均一化したものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar heating element for a mirror, and more particularly, to a heating element whose heating area is as close as possible to the peripheral edge of the mirror and whose temperature distribution is made uniform.
【０００２】[0002]
【従来の技術】自動車のミラーの曇り取りや氷を融かす
ために、ミラーの裏面に貼り付けられる従来の面状発熱
体１を図６，図７を参照して説明する。ミラーの外形よ
り僅かに小さな外形をもつ例えばポリエステルシートな
どの可撓性の絶縁シート２の一面上に帯状の第１，第２
電極３，４が、それぞれ上周縁及び下周縁に沿って互い
に対向して印刷により形成される。第１，第２電極３，
４の始端はこの例では図において絶縁シート２の上端左
側のコーナ部に位置される。第１，第２電極３，４より
それぞれ第１，第２櫛歯状電極５，６が互いに噛み合う
ように印刷の手段により突出形成される。2. Description of the Related Art A conventional sheet heating element 1 attached to the rear surface of a mirror of an automobile for defrosting and melting ice will be described with reference to FIGS. The strip-shaped first and second strips are formed on one surface of the flexible insulating sheet 2 such as a polyester sheet having an outer shape slightly smaller than that of the mirror.
The electrodes 3 and 4 are formed by printing so as to face each other along the upper peripheral edge and the lower peripheral edge, respectively. First and second electrodes 3,
In this example, the start end of 4 is located at the corner on the left side of the upper end of the insulating sheet 2 in the figure. The first and second electrodes 3 and 4 are projected and formed by printing means so that the first and second comb-teeth electrodes 5 and 6 mesh with each other.
【０００３】それらの第１，第２櫛歯状電極５，６を覆
うように抵抗体膜７が絶縁シート２上に印刷形成され
る。図７に示すように絶縁シート２の他面上に第１，第
２電源端子８，９が、それぞれハトメ金具１０，１１に
よりかしめ付けられて、第１，第２電極３，４の始端部
に接続される。面状発熱体１を電動ミラーに貼り付ける
場合、ミラーの裏側にモータ等の付属部品が配されるた
め、邪魔にならないように電源端子８，９はミラーのコ
ーナに位置されている。面状発熱体１は多くの場合、第
１，第２電極３，４及び抵抗体膜７を覆うように、絶縁
シート２の一面上に両面粘着テープ１２が貼付けられて
いる。ミラーに貼付けるとき離型紙１２ａが剥される。A resistor film 7 is printed on the insulating sheet 2 so as to cover the first and second comb-teeth-shaped electrodes 5 and 6. As shown in FIG. 7, the first and second power supply terminals 8 and 9 are crimped onto the other surface of the insulating sheet 2 by eyelet metal fittings 10 and 11, respectively, and the start end portions of the first and second electrodes 3 and 4 are joined. Connected to. When the sheet heating element 1 is attached to the electric mirror, accessory parts such as a motor are arranged on the back side of the mirror, so that the power supply terminals 8 and 9 are located at the corners of the mirror so as not to get in the way. In many cases, the sheet heating element 1 has a double-sided adhesive tape 12 attached to one surface of the insulating sheet 2 so as to cover the first and second electrodes 3 and 4 and the resistor film 7. The release paper 12a is peeled off when it is attached to the mirror.
【０００４】[0004]
【発明が解決しようとする課題】従来のミラー用面状発
熱体１は、比較的幅広でほぼ同じ幅の第１，第２電極
３，４が絶縁シート２の上周縁及び下周縁に沿って形成
されているため、発熱領域が放熱の激しいミラーの周縁
から離される。そのためミラーの温度分布は中央部分が
高く、周縁部が低く、その温度差がかなり大きくなり、
従って曇り取りや氷融に要する時間のばらつきが大きく
なる欠点があった。この発明の目的は、発熱領域をミラ
ーの周縁にできるだけ近付けると共に、ミラーの温度分
布を均一にし、場所によって曇り取りや氷融に要する時
間がばらつかないようにしようとするものである。In the conventional planar heating element 1 for a mirror, the first and second electrodes 3 and 4 having a relatively wide width and substantially the same width are provided along the upper and lower peripheral edges of the insulating sheet 2. Since it is formed, the heat generating region is separated from the peripheral edge of the mirror that radiates heat significantly. Therefore, the temperature distribution of the mirror is high in the central part and low in the peripheral part, and the temperature difference becomes considerably large,
Therefore, there is a drawback that the time required for defrosting and ice melting becomes large. An object of the present invention is to make the heat generating region as close as possible to the peripheral edge of the mirror, make the temperature distribution of the mirror uniform, and prevent the time required for defrosting and ice melting from varying from place to place.
【０００５】[0005]
（１）請求項１の発明では、第１電極は絶縁シートの周
縁部をほぼ一周するように延長され、その全長のほぼ中
間部に第１電源端子が接続され、第２電極は絶縁シート
のほぼ中央部を概略長手方向に沿って形成され、その一
端は第１電極の上記中間部に近接対向して配されると共
に上記第２電源端子に接続される。(1) In the invention of claim 1, the first electrode is extended so as to substantially go around the peripheral portion of the insulating sheet, the first power supply terminal is connected to an approximately middle portion of the entire length thereof, and the second electrode is made of the insulating sheet. A substantially central portion is formed substantially along the longitudinal direction, and one end thereof is disposed in close proximity to the intermediate portion of the first electrode and is connected to the second power supply terminal.
【０００６】（２）請求項２の発明では、絶縁シートの
周縁から上記第１又は第２電極のほぼ中心線に沿ってス
リットが切り込み形成される。 （３）請求項３の発明では、上記第１，第２電極は、概
ねＵ字状で、互いに噛み合うように形成され、これによ
り発熱領域が上記第１，第２電極に挟まれて、互いにほ
ぼ平行な、大略３個の帯状部分（３１，３２，３３）に
分割される。(2) In the invention of claim 2, a slit is formed by cutting from the peripheral edge of the insulating sheet along substantially the center line of the first or second electrode. (3) In the invention of claim 3, the first and second electrodes are substantially U-shaped and are formed so as to mesh with each other, whereby the heat generating region is sandwiched between the first and second electrodes, and is It is divided into approximately three strip-shaped portions (31, 32, 33) which are substantially parallel to each other.
【０００７】（４）請求項４の発明では、それらの両端
の帯状部分（３１，３３）の幅（Ｌ 1 ，Ｌ3 ）は、中央
の帯状部分（３２）の幅（Ｌ2 ）に対してそれぞれ小さ
く設定される。 （５）請求項５の発明では、上記（１）項乃至（４）項
のいずれかにおいて、第１，第２電極の幅は第１又は第
２電源端子とそれぞれ接続されている部分が広く、端末
に行くに従って狭くなるように形成される。(4) In the invention of claim 4, both ends thereof are
Width (L, L) of the strips (31, 33) of 1, L3) Is the center
Width of the strip (32) of (L2) Each small
Is set. (5) In the invention of claim 5, in the above items (1) to (4)
In either of the above, the width of the first and second electrodes is the first or the first
2 The part connected to each power supply terminal is wide, and the terminal
It is formed so that it becomes narrower as it goes to.
【０００８】（６）請求項６の発明では、上記（１）項
乃至（５）項のいずれかにおいて、上記抵抗体膜にスト
ライプ状のスリットが形成されている。(6) In the invention of claim 6, in any one of the above items (1) to (5), a stripe-shaped slit is formed in the resistor film.
【０００９】[0009]
【実施例】この発明の実施例を図１乃至図３に、図６，
図７と対応する部分に同じ符号を付し、重複説明を省略
する。この例では透明な絶縁シート２が用いられ、図１
はその絶縁シート２の電源端子８，９を取付けた面側か
ら見た図である。面状発熱体１は第１，第２電極３，４
によって複数の発熱領域２１乃至２４に分割される。こ
のようにすると各発熱領域の放熱状態を考慮した発熱設
計が行い易くなり、ミラーの温度分布を均一にするのが
容易となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in FIGS.
The same reference numerals are given to the portions corresponding to those in FIG. 7, and the duplicated description will be omitted. In this example, a transparent insulating sheet 2 is used, as shown in FIG.
FIG. 3 is a view of the insulating sheet 2 as seen from the surface side to which the power supply terminals 8 and 9 are attached. The sheet heating element 1 includes the first and second electrodes 3, 4
Is divided into a plurality of heat generating regions 21 to 24. This facilitates heat generation design in consideration of the heat radiation state of each heat generation region, and facilitates uniform temperature distribution of the mirror.
【００１０】この例では、第１電極３は絶縁シート２の
周縁部をほぼ一周するように形成され、その全長のほぼ
中間部に接続するように上記第１電源端子８がハトメ金
具により絶縁シート２の他面に取付けられる。このよう
にすると第１電極３によって第１電源端子８を通る電流
をほぼ１／２ずつ互いに反対方向に分流させることがで
きるので、第１電極３の幅を従来の第１，第２電極幅の
ほぼ１／２にすることができる。従って抵抗体膜７が絶
縁シート２の周縁により近付けられ、放熱の関係で温度
の上りにくいミラーの周縁部を効果的に加熱できる。In this example, the first electrode 3 is formed so as to go around the peripheral portion of the insulating sheet 2 almost once, and the first power supply terminal 8 is connected to the intermediate portion of the entire length thereof by means of eyelet fittings. 2 is attached to the other side. In this way, the current flowing through the first power supply terminal 8 can be shunted by approximately ½ in the opposite directions by the first electrode 3, so that the width of the first electrode 3 can be reduced to the conventional first and second electrode widths. Can be almost halved. Therefore, the resistor film 7 is brought closer to the peripheral edge of the insulating sheet 2, and the peripheral edge of the mirror, which is unlikely to rise in temperature due to heat radiation, can be effectively heated.
【００１１】第２電極４は絶縁シート２のほぼ中央部を
概略長手方向に沿って形成され、その一端は第１電極３
の上記中間部に近接対向して配され、その一端に接続す
るように第２電源端子９がハトメ金具により絶縁シート
２の他面に取付けられる。このように第２電極４をミラ
ーの最も温度の上り易い中央部分と対向するように設け
ることによって、その中央部分で発熱しないようにして
温度の突出を抑えることができる。The second electrode 4 is formed in a substantially central portion of the insulating sheet 2 along a substantially longitudinal direction, and one end of the second electrode 4 is formed at the first electrode 3.
The second power supply terminal 9 is attached to the other surface of the insulating sheet 2 by means of eyelets so as to be connected to one end of the intermediate portion of the insulating sheet 2. In this way, by providing the second electrode 4 so as to face the central portion of the mirror where the temperature is most likely to rise, it is possible to prevent the temperature from protruding without generating heat in the central portion.
【００１２】第１，第２電極３，４よりそれぞれ導出さ
れた第１，第２櫛歯状電極５，６を覆うように、絶縁シ
ート２上に図３の抵抗体膜７が印刷により形成される。
この例では発熱領域２１，２２に位置する抵抗体膜７に
複数のストライプ状のスリット２５が設けられている。
スリット２５の部分では抵抗体膜による発熱がなくな
り、発熱領域２１，２２内の発熱量が抑えられる。放熱
の関係で温度の上りにくい隅の発熱領域２３，２４では
スリットは設けられていない。このようにスリット２５
を適宜に設けることによって、ミラーの温度分布を均一
にしている。しかしスリット２５を設けない場合もあ
る。A resistor film 7 of FIG. 3 is formed by printing on the insulating sheet 2 so as to cover the first and second comb-teeth electrodes 5 and 6 led out from the first and second electrodes 3 and 4, respectively. To be done.
In this example, a plurality of stripe-shaped slits 25 are provided in the resistor film 7 located in the heat generating regions 21 and 22.
In the slit 25 portion, heat generation by the resistor film is eliminated, and the heat generation amount in the heat generation regions 21 and 22 is suppressed. No slits are provided in the heat generating regions 23 and 24 at the corners where the temperature is hard to rise due to heat dissipation. Thus slit 25
The temperature distribution of the mirror is made uniform by appropriately providing. However, the slit 25 may not be provided in some cases.
【００１３】図１の例では第１，第２電極３，４に流れ
る電流は、第１，第２電源端子８，９と接続される箇所
が最も大きいので電極幅が広く、端末に行くに従って電
流が少くなるので電極幅も次第に狭くなるようにされて
いる。このようにすると局部的に電流密度が過大となっ
て温度が著しく上昇し、電極膜を焼損させるような事故
を防止できる。また端末に行くに従って電極幅を狭くす
ることによって、それだけ発熱領域を広げられると共
に、熱放散の激しいミラー周縁部に近づけることができ
る。In the example of FIG. 1, the currents flowing through the first and second electrodes 3 and 4 are the largest at the places where they are connected to the first and second power supply terminals 8 and 9, so that the electrode width is wide. Since the current is small, the electrode width is gradually narrowed. By doing so, it is possible to prevent an accident in which the current density is locally excessively increased and the temperature is remarkably increased to burn the electrode film. Further, by making the electrode width narrower toward the terminal, it is possible to widen the heat generation region and to bring it closer to the peripheral edge of the mirror where heat dissipation is severe.
【００１４】第１，第２電極のコーナ部においても、電
流は最短距離を流れようとするのでその曲率中心側の周
縁部に電流が集中するので、上記のような焼損が起こら
ないように、電極幅を広げて導電度を高めると共に電流
密度を緩和させている。このような目的で図１の例では
第１，第２電極３，４はそれぞれ図１においてＷ1 ，Ｗ
2 で示したコーナ部の幅が広げられている。Also in the corner portions of the first and second electrodes, the electric current tries to flow the shortest distance, so that the electric current concentrates on the peripheral portion on the side of the center of curvature, so that the above-mentioned burnout does not occur. The electrode width is widened to increase the conductivity and reduce the current density. For this purpose, in the example of FIG. 1, the first and second electrodes 3 and 4 are respectively W 1 and W in FIG.
The width of the corner shown in 2 is widened.
【００１５】図４に示すのは、この発明の他の実施例に
おける電極形状を示したものである。トラック等の大型
車のミラーを対象にしたもので、ミラーの外形及びその
曲率が大きいので、面状発熱体を貼り易くするために面
状発熱体、従って絶縁シート２の周縁から第２電極４の
中心線に沿ってスリット２６が形成される。スリット２
６により第２電極４は途中から二又に分割される。この
例では絶縁シート２の周縁部には、ミラーが収容保持さ
れるミラーホルダの凸部と嵌合する凹部２４（８箇所）
が設けられている。第１，第２電極３，４によって発熱
領域は、おおよそ左端部、右端部、中央部（上）及び中
央部（下）に区分されている。FIG. 4 shows an electrode shape in another embodiment of the present invention. The present invention is intended for a mirror of a large vehicle such as a truck. Since the outer shape and the curvature of the mirror are large, the planar heating element, that is, the periphery of the insulating sheet 2 and the second electrode 4 can be easily attached to the planar heating element. A slit 26 is formed along the center line of the. Slit 2
The second electrode 4 is bifurcated from the middle by means of 6. In this example, in the peripheral portion of the insulating sheet 2, concave portions 24 (8 places) that fit with the convex portions of the mirror holder in which the mirror is housed and held.
Is provided. The heat generating region is roughly divided into a left end portion, a right end portion, a central portion (upper) and a central portion (lower) by the first and second electrodes 3 and 4.
【００１６】図４の場合も、図１の実施例で既に説明し
たように、絶縁シート２の温度が最も上がり易い中央部
分に第２電極４が配され、第２電極の存在する領域で発
熱しないようにして温度の突出を抑えるようにしてい
る。従って第２電極４のほぼ中心線に沿ってスリット２
６を設ければ、スリットの部分で発熱が無くなっても、
発熱体の温度分布に与える影響をほとんど無くすことが
できる。Also in the case of FIG. 4, as already described in the embodiment of FIG. 1, the second electrode 4 is arranged in the central portion where the temperature of the insulating sheet 2 is most likely to rise, and heat is generated in the region where the second electrode exists. This is done to prevent temperature rise. Therefore, the slit 2 is formed substantially along the center line of the second electrode 4.
If 6 is provided, even if heat generation disappears in the slit part,
The influence on the temperature distribution of the heating element can be almost eliminated.
【００１７】図５に示すのはこの発明の更に他の実施例
における電極形状を示したものである。第１，第２電極
３，４は大略Ｕ字状で、互いに噛み合うように対向して
形成され、これにより発熱領域が第１，第２電極３，４
に挟まれて、ほぼ平行な大略３個の帯状部分３１，３
２，３３に分割される。その分割された両端の帯状部分
３１，３３の幅Ｌ1 ，Ｌ3 は、中央の帯状部分３２の幅
Ｌ2 に対してそれぞれ小さく設定される。第１，第２櫛
歯状電極５，６の長さは、両端の帯状部分３１，３３に
形成されたものの方が、中央の帯状部分３２に形成され
たものより短くなる。FIG. 5 shows an electrode shape according to still another embodiment of the present invention. The first and second electrodes 3 and 4 are generally U-shaped and are formed so as to face each other so as to mesh with each other.
Sandwiched between the three parallel strips 31, 3
It is divided into 2, 33. The widths L 1 and L 3 of the divided strip portions 31 and 33 at both ends are set smaller than the width L 2 of the central strip portion 32, respectively. The lengths of the first and second comb-teeth-shaped electrodes 5 and 6 are shorter in the strip-shaped portions 31 and 33 on both ends than in the strip-shaped portions 32 at the center.
【００１８】第１，第２櫛歯状電極５，６間の電気抵抗
はそれら電極３の長さにほぼ反比例し、抵抗体膜を通じ
て第１，第２櫛歯状電極５，６に流れる電流は逆にそれ
ら電極の長さにほぼ比例する。第１，第２櫛歯状電極
５，６の電流はそれぞれ第１，第２電極３，４に流れ
る。上記両端の幅Ｌ1 ，Ｌ3 が中央の幅Ｌ2 より狭くさ
れているので、一端の帯状部分３１の外側の第１電極３
ａ及び他端の帯状部分３３の外側の第２電極４ａにそれ
ぞれ流れる電流は、中央の帯状部分３２を挟む第１，第
２電極３ｂ，４ｂの各電流（それぞれ帯状部分３２と３
３又は３１と３２の電流の和に等しい）の１／２より更
に小さくできる。従って、電極３ａ，４ａの幅をそれぞ
れ４ｂ又は３ｂの幅より狭くして、発熱領域をミラーの
周縁に近付けることができる。The electric resistance between the first and second comb-teeth electrodes 5, 6 is substantially inversely proportional to the length of the electrodes 3, and the current flowing through the resistor film to the first and second comb-teeth electrodes 5, 6. , On the contrary, is approximately proportional to the length of the electrodes. The currents of the first and second comb-teeth-shaped electrodes 5 and 6 flow to the first and second electrodes 3 and 4, respectively. Since the widths L 1 and L 3 at both ends are narrower than the width L 2 at the center, the first electrode 3 outside the strip-shaped portion 31 at one end
a and the current flowing in the second electrode 4a outside the strip-shaped portion 33 at the other end are the currents of the first and second electrodes 3b and 4b sandwiching the central strip-shaped portion 32 (the strip-shaped portions 32 and 3 respectively).
3 or equal to the sum of the currents 31 and 32)). Therefore, the widths of the electrodes 3a and 4a can be made narrower than the widths of 4b and 3b, respectively, and the heat generating region can be brought close to the peripheral edge of the mirror.
【００１９】[0019]
（１）第１電極を絶縁シート２の周縁部をほぼ一周する
ように形成し、その全長のほぼ中間部に第１電源端子を
接続し、第２電極４を絶縁シート２のほぼ中央部を概略
長手方向に沿って形成した場合（図１，図４）には、温
度の上りにくいミラーの周縁部を効果的に加熱できると
共に温度が上り易いミラーの中央部の温度上昇を抑える
のが容易となる。(1) The first electrode is formed so as to go around the peripheral portion of the insulating sheet 2 almost once, the first power supply terminal is connected to the substantially middle portion of the entire length thereof, and the second electrode 4 is connected to the substantially central portion of the insulating sheet 2. When it is formed along the substantially longitudinal direction (FIGS. 1 and 4), it is possible to effectively heat the peripheral portion of the mirror where the temperature does not rise easily, and it is easy to suppress the temperature rise of the central portion of the mirror where the temperature rises easily. Becomes
【００２０】（２）絶縁シート２の周縁から第１又は第
２電極のほぼ中心線に沿ってスリット２６を形成した場
合（図４）には、面状発熱体が貼り易くなると共に、そ
の温度分布に与える影響を無くすことができる。 （３）第１，第２電極をＵ字状で噛み合うように形成
し、発熱領域をほぼ平行な３個の帯状部分（３１，３
２，３３）に分割し、両端の帯状部分（３１，３３）の
幅Ｌ1 ，Ｌ3 を中央の帯状部分の幅Ｌ2 より小さく設定
した場合（図５）には、両端の帯状部分の外側の第１，
第２電極３ｂ，４ｂの電流をかなり小さくすることがで
き、従って電極幅を狭くして、発熱領域をミラーの周縁
に近付けることができる。(2) When the slit 26 is formed from the peripheral edge of the insulating sheet 2 substantially along the center line of the first or second electrode (FIG. 4), it becomes easy to attach the sheet heating element and its temperature The influence on the distribution can be eliminated. (3) The first and second electrodes are formed so as to mesh with each other in a U shape, and the heat generating regions are formed in three substantially parallel strip portions (31, 3).
2, 33) and the widths L 1 and L 3 of the strip portions (31, 33) at both ends are set smaller than the width L 2 of the central strip portion (FIG. 5), Outer first 1,
The current of the second electrodes 3b and 4b can be made considerably small, and therefore the electrode width can be narrowed to bring the heat generating region closer to the peripheral edge of the mirror.
【００２１】（４）第１，第２電極３，４の幅を第１又
は第２電源端子８又は９とそれぞれ接続されている部分
を広く、端末に行くに従って狭く形成した場合には、電
流集中による電極膜の焼損を防止できると共に発熱領域
をミラーの周縁に近付けることができる。 （５）抵抗体膜７にスリット２５を設けた場合には、各
発熱領域の抵抗体膜の占有面積、従って発熱量の調整が
容易となるので、ミラーの温度分布を均一にするのが容
易となる。(4) When the widths of the first and second electrodes 3 and 4 are formed such that the portion connected to the first or second power supply terminal 8 or 9 is wide and the width is narrower toward the terminal, the current It is possible to prevent burnout of the electrode film due to concentration and to bring the heat generating region closer to the peripheral edge of the mirror. (5) When the slit 25 is provided in the resistor film 7, it is easy to adjust the occupied area of the resistor film in each heat generation region, and thus the amount of heat generation, so that it is easy to make the temperature distribution of the mirror uniform. Becomes
【図１】この発明の実施例を示す図で、透明な絶縁シー
ト２の表面側（電極形成面と反対側）より見た平面図。FIG. 1 is a view showing an embodiment of the present invention and is a plan view seen from the front surface side (the side opposite to the electrode formation surface) of a transparent insulating sheet 2.
【図２】図１の絶縁シート２の裏面に形成された各種電
極の形状を示す図。FIG. 2 is a view showing the shapes of various electrodes formed on the back surface of the insulating sheet 2 of FIG.
【図３】各種電極が形成された図２の絶縁シート２の裏
面に印刷される抵抗体膜７の形状を示す図。3 is a diagram showing the shape of a resistor film 7 printed on the back surface of the insulating sheet 2 of FIG. 2 on which various electrodes are formed.
【図４】この発明の他の実施例において、絶縁シート２
の裏面に形成された電極形状を示す図。FIG. 4 is an insulation sheet 2 according to another embodiment of the present invention.
The figure which shows the electrode shape formed in the back surface of.
【図５】この発明の更に他の実施例おいて、絶縁シート
２の裏面に形成された電極形状を示す図。FIG. 5 is a view showing the shape of electrodes formed on the back surface of the insulating sheet 2 in still another embodiment of the present invention.
【図６】従来のミラー用面状発熱体において、絶縁シー
ト２の裏面に形成された電極と抵抗体膜との形状を示す
図。FIG. 6 is a diagram showing the shapes of an electrode and a resistor film formed on the back surface of the insulating sheet 2 in a conventional planar heating element for a mirror.
【図７】従来のミラー用面状発熱体の要部の断面図。FIG. 7 is a sectional view of a main part of a conventional planar heating element for a mirror.
Claims (6)
つ可撓性の絶縁シートの一面上に帯状の第１，第２電極
が対向して形成され、それら第１，第２電極よりそれぞ
れ第１，第２櫛歯状電極が互いに噛み合うように突出形
成され、それら第１，第２櫛歯状電極を覆うように抵抗
体膜が上記絶縁シート上に形成され、上記絶縁シートの
他面上に、上記第１，第２電極とそれぞれ接続された第
１，第２電源端子が固定されて成るミラー用面状発熱体
において、 上記第１電極は、上記絶縁シートの周縁部をほぼ一周す
るように延長され、その全長のほぼ中間部に上記第１電
源端子が接続され、 上記第２電極は、上記絶縁シートのほぼ中央部を概略長
手方向に沿って延長され、その一端は第１電極の上記中
間部に近接対向して配されると共に上記第２電源端子に
接続されることを特徴とするミラー用面状発熱体。1. A strip-shaped first and second electrode are formed to face each other on one surface of a flexible insulating sheet having an outer shape slightly smaller than the outer shape of the mirror, and the first and second electrodes respectively form a first electrode. First and second comb-teeth-shaped electrodes are formed so as to protrude from each other, and a resistor film is formed on the insulating sheet so as to cover the first and second comb-teeth-shaped electrodes, and on the other surface of the insulating sheet. In the planar heating element for a mirror, in which the first and second power supply terminals respectively connected to the first and second electrodes are fixed, the first electrode makes one round of the peripheral edge of the insulating sheet. And the first power supply terminal is connected to a substantially middle portion of the entire length thereof, the second electrode extends substantially in the central portion of the insulating sheet along a substantially longitudinal direction, and one end of the first electrode is the first electrode. Is disposed close to and facing the intermediate portion of Mirror surface-like heating element, characterized in that it is connected to the power supply terminal.
つ可撓性の絶縁シートの一面上に帯状の第１，第２電極
が対向して形成され、それら第１，第２電極よりそれぞ
れ第１，第２櫛歯状電極が互いに噛み合うように突出形
成され、それら第１，第２櫛歯状電極を覆うように抵抗
体膜が上記絶縁シート上に形成され、上記絶縁シートの
他面上に、上記第１，第２電極とそれぞれ接続された第
１，第２電源端子が固定されて成るミラー用面状発熱体
において、 上記絶縁シートの周縁から上記第１又は第２電極のほぼ
中心線に沿ってスリットが切り込み形成されていること
を特徴とするミラー用面状発熱体。2. A strip-shaped first and second electrode are formed to face each other on one surface of a flexible insulating sheet having an outer shape slightly smaller than the outer shape of the mirror. First and second comb-teeth-shaped electrodes are formed so as to protrude from each other, and a resistor film is formed on the insulating sheet so as to cover the first and second comb-teeth-shaped electrodes, and on the other surface of the insulating sheet. In a planar heating element for a mirror, in which first and second power supply terminals respectively connected to the first and second electrodes are fixed, in the center of the first or second electrode from the peripheral edge of the insulating sheet. A planar heating element for a mirror, characterized in that slits are formed along the line.
つ可撓性の絶縁シートの一面上に帯状の第１，第２電極
が対向して形成され、それら第１，第２電極よりそれぞ
れ第１，第２櫛歯状電極が互いに噛み合うように突出形
成され、それら第１，第２櫛歯状電極を覆うように抵抗
体膜が上記絶縁シート上に形成され、上記絶縁シートの
他面上に、上記第１，第２電極とそれぞれ接続された第
１，第２電源端子が固定されて成るミラー用面状発熱体
において、 上記第１，第２電極は、概ねＵ字状で、互いに噛み合う
ように形成され、これにより発熱領域が上記第１，第２
電極に挟まれて、互いにほぼ平行な、大略３個の帯状部
分（３１，３２，３３）に分割されることを特徴とする
ミラー用面状発熱体。3. A strip-shaped first and second electrode are formed to face each other on one surface of a flexible insulating sheet having an outer shape slightly smaller than the outer shape of the mirror. First and second comb-teeth-shaped electrodes are formed so as to protrude from each other, and a resistor film is formed on the insulating sheet so as to cover the first and second comb-teeth-shaped electrodes, and on the other surface of the insulating sheet. In the planar heating element for a mirror, in which the first and second power supply terminals respectively connected to the first and second electrodes are fixed, the first and second electrodes are substantially U-shaped and It is formed so as to mesh with each other, so that the heat generating regions are
A planar heating element for a mirror, which is sandwiched between electrodes and divided into approximately three strip-shaped portions (31, 32, 33) which are substantially parallel to each other.
（３１，３３）の幅（Ｌ1 ，Ｌ3 ）は、中央の帯状部分
（３２）の幅（Ｌ2 ）に対してそれぞれ小さく設定され
ることを特徴とするミラー用面状発熱体。4. The width (L 1 , L 3 ) of the strip portions (31, 33) at both ends is set smaller than the width (L 2 ) of the strip portion (32) at the center according to claim 3. A planar heating element for a mirror, which is characterized in that
記第１，第２電極の幅は、上記第１又は第２電源端子と
それぞれ接続されている部分が広く、端末に行くに従っ
て狭くなるように形成されていることを特徴とするミラ
ー用面状発熱体。5. The width of each of the first and second electrodes according to claim 1, wherein a portion connected to each of the first and second power supply terminals is wide and becomes narrower toward a terminal. A planar heating element for a mirror, which is formed as described above.
記抵抗体膜にストライプ状のスリットが形成されている
ことを特徴とするミラー用面状発熱体。6. The planar heating element for a mirror according to claim 1, wherein a stripe-shaped slit is formed in the resistor film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6117916A JPH0799083A (en) | 1994-05-31 | 1994-05-31 | Sheet-like heating element for mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6117916A JPH0799083A (en) | 1994-05-31 | 1994-05-31 | Sheet-like heating element for mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0799083A true JPH0799083A (en) | 1995-04-11 |
Family
ID=14723359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6117916A Pending JPH0799083A (en) | 1994-05-31 | 1994-05-31 | Sheet-like heating element for mirror |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0799083A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004511890A (en) * | 2000-10-06 | 2004-04-15 | イリノイ トゥール ワークス インコーポレイティド | Electric heater with thermistor |
| FR3101283A1 (en) * | 2019-09-27 | 2021-04-02 | Valeo Systemes Thermiques | Heating structure for motor vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61211982A (en) * | 1985-03-18 | 1986-09-20 | 古河電気工業株式会社 | Carbon heater |
| JPH02162143A (en) * | 1988-08-16 | 1990-06-21 | Illinois Tool Works Inc <Itw> | Heater |
-
1994
- 1994-05-31 JP JP6117916A patent/JPH0799083A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61211982A (en) * | 1985-03-18 | 1986-09-20 | 古河電気工業株式会社 | Carbon heater |
| JPH02162143A (en) * | 1988-08-16 | 1990-06-21 | Illinois Tool Works Inc <Itw> | Heater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004511890A (en) * | 2000-10-06 | 2004-04-15 | イリノイ トゥール ワークス インコーポレイティド | Electric heater with thermistor |
| FR3101283A1 (en) * | 2019-09-27 | 2021-04-02 | Valeo Systemes Thermiques | Heating structure for motor vehicle |
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