JP4596871B2 - Heating element - Google Patents

Description

  The present invention relates to a heating element used in a glass window of a house or office, or a glass door of a commercial refrigerator installed in a supermarket or a convenience store.

  Glass elements used for glass windows of residential and office glass windows, or commercial refrigerators installed in supermarkets and convenience stores, etc., are affected by temperature differences inside and outside the room in winter or temperature differences inside and outside the refrigerator. Condensation is likely to occur on the surface of the element.

Therefore, as shown in FIG. 7, two glass substrates 53 each having a conductive thin film 52 formed on the back surface 51 and a glass plate 54 facing the conductive thin film 52 are arranged at a predetermined interval. A glass element 50 in which two electrode portions 56, 56 arranged along the axial direction of each spacer 55, 55 are joined on the conductive thin film 52 is laminated. is there. In this glass element 50, the conductive thin film 52 is energized through the electrode portions 56, 56, thereby generating heat in the conductive thin film 52, and the glass element 50 is heated by this heat to suppress dew condensation generated on the surface 57. (For example, refer patent document 1).
The electrode portion 56 is formed of a resin-based conductive paste, and is configured to be supplied with power through a cord 58 connected to a power source (not shown) provided outside the glass element 50. Further, a sealing material 59 is provided between the glass substrate 53 and the glass plate 54 so as to correspond to the outer peripheral edges of the glass substrate 53 and the glass plate 54, and is sealed by the sealing material 59. The heat loss of the conductive thin film 52 can be reduced by the heat insulating effect of the space portion 60.
Japanese Patent Laid-Open No. 11-314943 (paragraph 0005, FIG. 1)

However, in the glass element 50, when the electrode portion 56 is joined to the conductive thin film 52, a conductive paste is applied to a predetermined position on the conductive thin film 52, and the conductive paste is dried to form the electrode portion 56. After that, it is necessary to attach the power cord 58 to the electrode portion 56. Therefore, there is a problem that the attaching operation of the electrode portion 56 becomes complicated and the manufacturing cost becomes high.
In addition, since the power cord 58 protrudes into the space portion 60 through the spacer 55, there is a problem that moisture enters the space portion 60 around the cord 58.

  Further, in the glass element 50, the glass substrate 53 and the electrode portions 56, 56 are heated and thermally expanded by the heat generation of the conductive thin film 52 by energization, so-called thermal shock. At this time, since the thermal expansion coefficients of the glass substrate 53 and the electrode portions 56 and 56 are significantly different from each other, a large difference occurs in the thermal expansion between the two, and stress is applied to the joint between the conductive thin film 52 and the electrode portions 56 and 56. Will join. Thus, when stress due to thermal shock is repeatedly applied to the joint, cracks or voids are generated in the joint, and the electrode portions 56 and 56 may peel from the conductive thin film 52 in some cases. In particular, when the strength of the conductive paste forming the electrode portions 56, 56 is set low in order to suppress the manufacturing cost of the glass element 50, the electrode portions 56, 56 are likely to be peeled off. And when the electrode parts 56 and 56 peel, it will become impossible to energize the electroconductive thin film 52 reliably, and malfunctions, such as disconnection of the electrode parts 56 and 56 and local abnormal heat generation of the electroconductive thin film 52, are carried out. Will occur. That is, the glass element 50 has a problem that durability against thermal shock is lowered.

  Further, in the glass element 50, the electrode portions 56, 56 are formed of a conductive paste. When a high current is passed through the electrode portions 56, 56, the conductive paste generates heat, so that There is a possibility that adhesive strength, conductivity, and the like may be reduced. Therefore, there is a problem that it is impossible to increase the heat generation temperature and the heating efficiency of the glass element 50 by passing a high current through the conductive thin film 52.

  Therefore, in the present invention, the above-described problems can be solved, and an electrode part for energizing the conductive thin film formed on the transparent substrate can be easily attached. Further, the electrode part has sufficient thermal shock durability. It is an object of the present invention to provide a heat generating element that can be provided and can prevent heat generation in the electrode portion.

In order to solve the above-mentioned problems, the present invention provides a heating element in which a transparent substrate having a conductive thin film formed on the back surface and a transparent plate facing the conductive thin film are laminated. Two spacers arranged at a predetermined interval are interposed between the plates, and each spacer is provided with an electrode portion having a contact terminal in contact with the conductive thin film. When the conductive thin film is energized through the contact terminals of the part, the conductive thin film is configured to generate heat , and the electrode part includes an embedded part disposed in the spacer and a contact terminal protruding from the spacer. It is characterized by being composed .

  Thus, in the heating element of the present invention, it is not necessary to join the electrode part to the conductive thin film by attaching the electrode part having the contact terminal in contact with the conductive thin film to the spacer. Thereby, in the process of laminating the transparent substrate and the transparent plate, the electrode portion is attached together with the spacer, so that the electrode portion can be easily attached between the transparent substrate and the transparent plate.

  In addition, since the spacer is interposed between the transparent substrate and the transparent plate and the spacer can be brought into close contact with the transparent substrate and the transparent plate, the moisture resistance between the spacer and the transparent substrate and the transparent plate is improved. In addition, since the distance between the transparent substrate and the transparent plate is maintained by the spacer, the stability of the transparent substrate and the transparent plate can be improved.

Moreover, since the electrode part is attached to the spacer, the power cord inserted into the spacer from the outside can be attached to the electrode part without protruding from the spacer. Thereby, while being able to make the wiring in a heat generating element simple, it can prevent that moisture penetrate | invades along a power cord.
Further, by disposing the buried portion of the electrode portion in the spacer, it is possible to prevent the electrode portion from being displaced or dropped. Further, since the embedded portion is not visible from the outside of the heating element, it is possible to provide a heating element with a good appearance.

  Furthermore, the electrode part is in contact with the conductive thin film by the contact terminal without bonding the whole electrode part to the conductive thin film, and the contact area between the electrode part and the conductive thin film is very small. Even if heat generation of the thin film, that is, so-called thermal shock occurs, the conductive thin film can be reliably energized without causing cracks or voids at the joint between the electrode portion and the conductive thin film. That is, in the heating element of the present invention, it is possible to sufficiently ensure the durability of thermal shock.

  In addition, since the electrode portion is not joined to the conductive thin film, it is not necessary to form the electrode portion with a conductive paste, so that the electrode portion can be prevented from being heated due to energization with a high current. Thereby, a high current can be applied to the conductive thin film through the electrode portion, and the heat generation temperature and the heating efficiency of the heating element can be increased.

  In addition, when a sealing material is provided between the transparent substrate and the transparent plate so as to surround the two spacers, the heat loss of the conductive thin film is reduced by the heat insulating effect of the space sealed by the sealing material. Can be reduced. Furthermore, when the spacer is bonded to the sealing material, the spacer to which the electrode portion is attached can be prevented from shifting.

  The heating element may have a configuration in which the contact terminal is biased toward the conductive thin film.

  Thus, in the heating element of the present invention, by energizing the contact terminal toward the conductive thin film, the contact terminal and the conductive thin film can be reliably brought into contact with each other. It can be done reliably.

  The heating element may have a configuration in which the electrode portion includes a plurality of contact terminals.

  Thus, in the heating element of the present invention, the electrode portion includes a plurality of contact terminals, so that even if some of the contact terminals are separated from the conductive thin film due to deformation or breakage, Since the contact with the conductive thin film can be ensured by the contact terminal, it is possible to reliably energize the conductive thin film.

In order to solve the above problems, another configuration of the present invention is a heating element in which a transparent substrate having a conductive thin film formed on the back surface and a transparent plate facing the conductive thin film are laminated. Between the transparent substrate and the transparent plate, two spacers arranged at a predetermined interval are interposed, and each spacer is provided with an electrode portion having a contact terminal in contact with the conductive thin film. The conductive thin film is configured to generate heat by energizing the conductive thin film through the contact terminals of the electrode part, and the embedded part disposed in the spacer is disposed between the embedded part and the conductive thin film. You may comprise an electrode part from the contact terminal interposed in.

  As described above, in the heating element of the present invention, the embedded portion of the electrode portion is disposed in the spacer, and the contact terminal is interposed between the embedded portion and the conductive thin film, whereby the contact terminal is embedded in the conductive portion and the conductive portion. Since it can be made to contact with a thin film reliably, electricity supply to a conductive thin film can be performed reliably. In addition, since the embedded portion becomes invisible from the outside of the heat generating element and the exposed portion of the contact terminal can be reduced, a heat generating element having a good appearance can be provided.

  A notch is formed on the end surface of the spacer that is in contact with the transparent substrate, and a contact terminal is fitted into the notch, thereby securing the contact portion between the spacer body and the transparent substrate, When a contact terminal is provided between the conductive thin film, the adhesion between the spacer, the transparent substrate and the transparent plate can be maintained, so that the moisture resistance between the spacer, the transparent substrate and the transparent plate is improved. In addition, since the distance between the transparent substrate and the transparent plate is maintained by the spacer, the stability of the transparent substrate and the transparent plate can be improved.

  A heating element in which a transparent substrate having a conductive thin film formed on the back surface and a transparent plate facing the conductive thin film are stacked, and a predetermined interval is provided between the transparent substrate and the transparent plate. Two spacers arranged with a gap between them are interposed, and each spacer has a flange portion urged toward the conductive thin film, and the spacer is interposed between the flange portion and the conductive thin film. You may comprise so that an electroconductive thin film may generate | occur | produce heat | fever by supplying with electricity to an electroconductive thin film through the provided electrode part.

As described above, in the heating element of the present invention, by interposing the electrode portion between the flange portion of the spacer and the conductive thin film, in the step of laminating the transparent substrate and the transparent plate, the electrode portion is attached together with the attachment of the spacer. Therefore, the electrode portion can be easily attached between the transparent substrate and the transparent plate.
In addition, since a wide contact area between the spacer and the transparent substrate can be ensured, moisture resistance between the spacer and the transparent substrate can be improved, and the transparent substrate and the transparent plate can be stabilized by the spacer.
Furthermore, the wiring in the heat generating element can be simplified, and moisture can be prevented from entering through the power cord.

According to such a heat generating element, in the process of laminating the transparent substrate and the transparent plate, by attaching the electrode part having the contact terminal in contact with the conductive thin film to the spacer, the electrode part is also attached together with the spacer. Therefore, the electrode portion can be easily attached between the transparent substrate and the transparent plate, and the manufacturing cost of the heating element can be reduced.
In addition, since the spacer is interposed between the transparent substrate and the transparent plate and the spacer can be brought into close contact with the transparent substrate and the transparent plate, the moisture resistance between the spacer and the transparent substrate and the transparent plate is improved. In addition, since the distance between the transparent substrate and the transparent plate is maintained by the spacer, the stability of the transparent substrate and the transparent plate can be improved.
In addition, since the power cord inserted into the spacer from the outside can be attached to the electrode portion without protruding from the spacer, the wiring in the heating element can be simplified, and moisture can be transmitted through the power cord. Intrusion can be prevented.
Furthermore, in the configuration in which the electrode portion having a contact terminal that is in contact with the conductive thin film is attached to the spacer, the contact area between the electrode portion and the conductive thin film is very small. The conductive thin film can be reliably energized, and the thermal shock durability can be sufficiently ensured.
In addition, since it is not necessary to form the electrode portion with a conductive paste and heat generation of the electrode portion due to energization with a high current can be prevented, a high current is passed through the electrode through the electrode portion, Heating efficiency can be increased.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
1A and 1B are diagrams showing a heating element of the present embodiment, where FIG. 1A is a plan view of the heating element, and FIG. 1B is a cross-sectional view taken along line AA of FIG. FIG. 2 is a partial perspective view of an electrode portion in the heating element of the present embodiment.
In the following description, the left and right directions correspond to the left and right directions in FIGS.

In the present embodiment, a heating element used for a glass window of a house or office, or a glass door of a commercial refrigerator installed in a supermarket or a convenience store will be described as an example.
As shown in FIG. 1 and FIG. 2, the heating element 1 of the present embodiment includes a transparent substrate 2 having a conductive thin film 3 formed on the back surface 2 a and a transparent plate 4 facing the conductive thin film 3. The conductive thin film 3 is heated by energizing the conductive thin film 3 from a pair of electrode portions 10, 10 provided between the transparent substrate 2 and the transparent plate 4. It is configured.
The back surface corresponds to the indoor side when the heating element 1 is a glass window, and the front surface corresponds to the outdoor side.

(Transparent substrate)
As shown in FIG. 1A, the transparent substrate 2 is a rectangular plate-like member in plan view. The shape of the transparent substrate 2 is not limited, and is determined according to the shape of the glass window or glass door.
Moreover, although the transparent substrate 2 can use glass, ceramics other than glass, heat resistant plastics, etc., it is preferable to use glass with excellent durability. Furthermore, as the transparent substrate 2 made of glass, heat ray reflecting glass, heat ray absorbing glass, low radiation glass, tempered glass, or the like can be used.

(Conductive thin film)
As shown in FIG. 1 (b), the conductive thin film 3 is formed on the back surface 2a of the transparent substrate 2 with a uniform thickness, and can be heated by energization. When the transparent substrate 2 is heated by the heat generated by the conductive thin film 3, the room temperature is generated by condensation generated on the surface 2b of the transparent substrate 2, or a cold downdraft (cold draft) generated at the window, or a heat flow through the window. And the occurrence of non-uniformity (mixing loss phenomenon) can be suppressed.
In addition, the conductive thin film 3 is preferably formed over the entire back surface 2a of the transparent substrate 2. However, if it is possible to suppress the occurrence of condensation, cold draft, and mixing loss, the back surface 2a of the transparent substrate 2 is formed. You may form in part.

Furthermore, the conductive thin film 3 is made of a metal oxide such as indium oxide, tin oxide, titanium oxide or tantalum oxide, or a mixture of these metal oxides (for example, ITO which is a mixture of indium oxide and tin oxide). However, it is preferable to use tin oxide having excellent conductivity.
The conductive thin film 3 can be formed by physical vapor deposition (PVD) methods such as ion plating and sputtering, scientific vapor deposition (CVD) methods such as thermal CVD and plasma CVD, or printing and coating methods. It can form using well-known techniques, such as. The film thickness of the conductive thin film 3 is preferably 200 nm to 500 nm. Incidentally, if the film thickness is less than 200 nm, the strength of the conductive thin film 3 is likely to be reduced, and if the film thickness is 500 nm or more, the workability when forming the conductive thin film 3 is likely to be reduced. End up.

(Transparent plate)
As shown in FIG. 1, the transparent plate 4 is disposed at a predetermined interval from the transparent substrate 2 so as to face the conductive thin film 3, and is a plate-like member having the same shape as the transparent substrate 2 in plan view. It is. Moreover, the transparent plate 4 can use glass, ceramics other than glass, heat-resistant plastics, etc. similarly to the transparent substrate 2, and as the transparent plate 4 made of glass, heat ray reflective glass, heat ray absorbing glass, Low radiation glass, tempered glass, or the like can be used. The transparent substrate 2 and the transparent plate 4 do not need to be formed of the same material, and are preferably set in consideration of the manufacturing cost of the heating element 1 and the like.
Further, between the transparent substrate 2 and the transparent plate 4, a pair of electrode spacers 5 and 5 arranged at a predetermined interval in the left-right direction in FIG. 1A and the vertical direction in FIG. A pair of spacers 5 ′ and 5 ′ arranged at a predetermined interval are interposed, and the transparent substrate 2 and the transparent plate 4 are connected by the four spacers 5 and 5 with electrodes and the spacers 5 ′ and 5 ′. It is kept at a predetermined interval.

(Spacer with electrode and spacer)
As shown in FIGS. 1 and 2, the spacers with electrodes 5, 5 and the spacers 5 ′, 5 ′ are interposed between the conductive thin film 3 formed on the transparent substrate 2 and the transparent plate 4. And a rectangular parallelepiped resin material arranged in the axial direction along the side edges of the transparent substrate 2 and the transparent plate 4, and each electrode spacer 5, 5 has an electrode portion for energizing the conductive thin film 3. 10 is attached. In this embodiment, the spacers 5 and 5 with electrodes and the spacers 5 ′ and 5 ′ are attached to the transparent substrate 2 with butyl tape (not shown). The spacers 5 ′, 5 ′ are surrounded by the spacers 5, 5, the spacers 5 ′, 5 ′, and the transparent substrate 2 and the transparent plate 4 without moving between the transparent substrate 2 and the transparent plate 4. As long as the moisture resistance of the space portion 7 can be secured, the fixing method is not limited. The materials of the spacers with electrodes 5 and 5 and the spacers 5 'and 5' are not limited. However, since they are in contact with the conductive thin film 3 that generates heat, a member having sufficient heat resistance is used. It is preferable.

Here, a sealing material 6 is interposed between the transparent substrate 2 and the transparent plate 4 so as to correspond to the outer peripheral edges of the transparent substrate 2 and the transparent plate 4. A sealed space portion 7 is formed between the transparent substrate 2 and the transparent plate 4. And since the heat loss of the electroconductive thin film 3 decreases by the heat insulation effect of the space part 7, the heat generating efficiency of the heat generating element 1 is increased.
The spacers with electrodes 5 and 5 and the spacers 5 ′ and 5 ′ are arranged in the space 7, respectively. In the spacers with electrodes 5, 5 and the spacers 5 ′ and 5 ′, the space 7 The side opposite to the side facing the inside is joined to the sealing material 6.
The sealing material 6 is, for example, an existing resin material having adhesiveness, and the transparent substrate 2 and the transparent plate 4 are joined by the adhesive force of the sealing material 6. Further, since the spacers 5 and 5 with electrodes and the spacers 5 'and 5' are joined to the sealing material 6, the spacers 5 and 5 with electrodes and the spacers 5 'and 5' are placed in the space 7. The electrodes are stably arranged, and the displacement of the spacers with electrodes 5 and 5 and the spacers 5 ′ and 5 ′ is prevented.
The material of the sealing material 6 is limited as long as it is a material that can reliably join the transparent substrate 2, the transparent plate 4, the spacers 5 and 5 with electrodes, and the spacers 5 ′ and 5 ′. However, since it is in contact with the conductive thin film 3 that generates heat, it is preferable to use a member having sufficient heat resistance.

(Electrode part)
As shown in FIGS. 1 and 2, the electrode portion 10 includes an embedded portion 12 disposed in the electrode spacer 5 and a contact terminal 11 protruding from the electrode spacer 5 toward the space portion 7. It is a member for energizing the conductive thin film 3.
The embedded portion 12 is a rectangular plate-like member embedded in the spacers 5 and 5 with electrodes, and is arranged at the center of the spacers 5 and 5 with electrodes along the axial direction of the spacers 5 and 5 with electrodes. Has been.
The buried portion 12 is a member such as copper, chromium, nickel, or silver, and it is preferable to use copper having excellent conductivity. A power cord 8 connected to a power source (not shown) provided outside the heating element 1 is attached to one end in the axial direction of the embedded portion 12 by solder 9. By supplying power to the portion 12, the conductive thin film 3 can be energized through the contact terminal 11 described later.
Thus, in the present embodiment, the power cord 8 is attached to the embedded portion 12 inside the spacer 5 with electrode, and the power cord 8 does not protrude into the space portion 7 from the spacer 5 with electrode. In addition to reducing the number of work steps, moisture can be prevented from entering the space 7 through the power cord 8.
Further, by embedding the embedded portion 12 in the electrode-attached spacer 5, it is possible to prevent the electrode portion 10 from being displaced or dropped out, and the embedded portion 12 becomes invisible from the outside of the heat generating element 1. 1 can be provided.

  Furthermore, a plurality of contact terminals 11 whose tip portions protruding from the electrode-attached spacer 5 are in contact with the conductive thin film 3 are attached to the embedded portion 12. Each contact terminal 11 is a rectangular plate-like member, and the material thereof can be a member such as copper, chromium, nickel, silver, etc., as with the buried portion 12, but copper having excellent conductivity is used. It is preferable.

Each contact terminal 11 is formed at predetermined intervals along the axial direction of the embedded portion 12. Moreover, the base end part of each contact terminal 11 is connected along the axial direction of the burying part 12, and is attached to the intermediate part of the thickness direction (up-down direction in FIG.1 (b)) of the burying part 12. FIG. Each contact terminal 11 is inclined from the base end toward the conductive thin film 3.
In addition, the tip of each contact terminal 11 is curved by contacting the conductive thin film 3 and is biased toward the conductive thin film 3. Thus, by urging the contact terminal 11 toward the conductive thin film 3, the conductive thin film 3 and the contact terminal 11 can be reliably brought into contact with each other. Energization can be performed reliably.

The heat generating element 1 configured as described above has the following operational effects.
First, in the heating element 1 of the present embodiment, in the step of laminating the transparent substrate 2 and the transparent plate 4 by attaching the electrode portions 10 for energizing the conductive thin film 3 in the spacers 5 and 5 with electrodes, Since the electrode portion 10 is attached together with the attachment of the spacers 5 and 5 with the electrode, the electrode portion 10 can be easily attached between the transparent substrate 2 and the transparent plate 4, and the manufacturing cost of the heating element 1 can be reduced. Can be reduced.

  Each electrode spacer 5, 5 is interposed between the transparent substrate 2 and the transparent plate 4, and the upper end surface and the lower end surface of each electrode spacer 5, 5 are in close contact with the transparent substrate 2 and the transparent plate 4. Therefore, the moisture resistance between the spacers 5 and 5 with the electrodes and the transparent substrate 2 and the transparent plate 4 can be improved, and the transparent substrates 2 can be formed by the spacers 5 and 5 with a uniform thickness. Therefore, the stability of the transparent substrate 2 and the transparent plate 4 can be improved.

  Further, since the electrode portion 10 is in contact with the conductive thin film 3 by a plurality of contact terminals 11, when the heating element 1 is assembled, some of the contact terminals 11 are separated from the conductive thin film 3 due to deformation or damage. Even if it is a case, contact with the conductive thin film 3 can be ensured by the other contact terminals 11, and the conductive thin film 3 can be reliably energized.

Then, when the conductive thin film 3 is energized through the electrode portion 10 to heat the conductive thin film 3 and heat the transparent substrate 2, dew condensation generated on the surface 2 b of the transparent substrate 2, cold draft, or mixing loss phenomenon occurs. Occurrence can be suppressed.
At this time, since the contact terminal 11 is biased toward the conductive thin film 3, the conductive thin film 3 can be reliably energized.

In addition, since the electrode portion 10 is not bonded to the conductive thin film 3 and the bonding area between the contact terminal 11 and the conductive thin film 3 is very small, even if a thermal shock occurs, the conductive thin film 3 The conductive thin film 3 can be reliably energized without causing cracks or voids at the joint between the contact terminal 11 and the contact terminal 11, and the durability of the thermal shock is sufficiently ensured.
Furthermore, since it is not necessary to form the electrode portion 10 with a conductive paste and heat generation of the electrode portion 10 due to energization of a high current can be prevented, a high current is passed through the conductive thin film 3 through the electrode portion 10, thereby generating a heating element. 1 heating temperature and heating efficiency can be increased.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.
3A and 3B are diagrams showing a reference example of the heating element of the present embodiment, in which FIG. 3A is a cross-sectional view of a configuration in which the electrode portion is attached to the side surface of the spacer with electrode, and FIG. 3B is a partial perspective view of the electrode portion. FIG. FIG. 4 is a diagram showing another configuration of the heating element of the present embodiment, and FIG. 4A is a cross-sectional view of a configuration in which a cylindrical contact terminal is interposed between the embedded portion and the conductive thin film. b) is a partial cross-sectional view of an electrode portion. FIG. 5 is a diagram showing another configuration of the heating element of the present embodiment. FIG. 5A is a cross-sectional view of a configuration in which a contact terminal made of a flat mesh copper wire is interposed between the embedded portion and the conductive thin film. FIG. 4B is a partial cross-sectional view of the electrode portion. 6A and 6B are diagrams showing another configuration of the heating element of the present embodiment, in which FIG. 6A is a sectional view of a configuration in which a flange portion is formed on a spacer with an electrode, and FIG. 6B is a partial sectional view of the electrode portion. is there.

For example, in this embodiment, as shown in FIG. 2, the embedded portion 12 is disposed in the spacers 5 and 5 with electrodes, and the contact terminals 11 are projected from the spacers 5 and 5 with electrodes to contact the conductive thin film 3. However, as in the reference example shown in FIG. 3, the inner portion of the space portion 7 can be formed in each of the spacers 5 and 5 with electrodes without arranging a part of the electrode portion 20 in the spacers 5 and 5 with electrodes. depositing the electrode portion 20 on the side facing may Rukoto. In this configuration, since the embedded portion 12 (see FIG. 2) and each contact terminal 21 in the above embodiment are integrated, the electrode portion 20 can have a simple structure. Furthermore, since it is not necessary to process the inside of the spacers 5 and 5 with an electrode, the heat generating element 1 can be manufactured easily.

  In addition, as shown in FIG. 4, in each of the electrode-attached spacers 5 a, 5 a, a notch is formed on the end face facing the conductive thin film 3, and the embedded portion 32 and the conductive thin film 3 disposed in the electrode-attached spacer 5 a are formed. There is an electrode portion 30 in which a cylindrical contact terminal 31 is provided so that the contact terminal 31 is compressed between the embedded portion 32 and the conductive thin film 3. In this configuration, since the contact terminal 31 is biased toward the embedded portion 32 and the conductive thin film 3, the contact terminal 31 can be reliably brought into contact with the embedded portion 32 and the conductive thin film 3. Moreover, since the site | part which the contact terminal 31 is exposed to the space part 7 can be decreased, the heat generating element 1 of the favorable external appearance can be provided.

  In this way, the contact terminals 31 are fitted into the notches formed on the end surfaces of the spacers 5a, 5a that are in contact with the transparent substrate 2 so that the main body of the spacers 5a, 5a and the transparent substrate 4 The contact terminal 31 can be provided between the buried portion 32 and the conductive thin film 3 in a state where contact is ensured. Thereby, since each spacer 5a, 5a with an electrode can be closely_contact | adhered to the transparent substrate 2 and the transparent plate 4 with a butyl tape (not shown), the moisture resistance of the space part 7 can be improved. Moreover, since the space | interval of the transparent substrate 2 and the transparent plate 4 is hold | maintained by each spacer 5a, 5a with an electrode, stability of the transparent substrate 2 and the transparent plate 4 can be improved.

  Further, instead of the cylindrical contact terminal 31, as shown in FIG. 5, an existing contact terminal 33 made of a flat mesh copper wire is interposed between the embedded portion 32 in the electrode-attached spacer 5a and the conductive thin film 3. In this configuration, the manufacturing cost of the heating element 1 can be reduced by using an existing flat mesh copper wire.

  As another configuration of the spacer with electrodes, as shown in FIG. 6, the flange portion 5 c biased toward the conductive thin film 3 is projected from the lower end portion of the side surface 5 d on the sealing material 6 side, The electrode-attached spacer 5b is configured such that the electrode portion 40 is interposed between the flange portion 5c and the conductive thin film 3 and the conductive thin film 3 is energized through the electrode portion 40 to generate heat. is there. The flange portion 5c of the electrode-attached spacer 5b is formed so as to be biased toward the conductive thin film 3 when the electrode-attached spacer 5b body is compressed between the transparent substrate 2 and the transparent plate 4. ing.

In this configuration, the electrode portion 40 can be simplified without providing a contact terminal, and the contact area between the lower end surface of the electrode-attached spacer 5b and the transparent substrate 2 can be secured widely. Adhesion between the attached spacer 5b and the transparent substrate 2 can be enhanced, and moisture resistance between the electrode-attached spacer 5b and the transparent substrate 2 can be enhanced.
Moreover, since the electrode part 40 will be attached with attachment of the spacer 5b with an electrode similarly to above-described embodiment, the electrode part 40 can be easily attached between the transparent substrate 2 and the transparent plate 4. FIG. . Furthermore, the wiring in the heating element 1 can be simplified, and moisture can be prevented from entering the space 7 through the power cord 8.
The flange portion 5c may be provided on the side surface 5e opposite to the side surface 5d on the sealing material 6 side, and the configuration thereof is not limited.

2A and 2B are diagrams illustrating a heating element according to the present embodiment, in which FIG. 1A is a plan view of the heating element, and FIG. 1B is a cross-sectional view taken along line AA in FIG. It is a fragmentary perspective view of the electrode part in the heat generating element of this embodiment. It is the figure which showed the reference example in the heat generating element of this embodiment, (a) is sectional drawing of the structure by which the electrode part was affixed on the side surface of the spacer with an electrode, (b) is the fragmentary perspective view of an electrode part. It is the figure which showed the other structure in the heat generating element of this embodiment, (a) is sectional drawing of the structure by which the contact terminal was interposed between the embedding part and the electroconductive thin film, (b) is a part of an electrode part It is sectional drawing. It is the figure which showed the other structure in the heat generating element of this embodiment, (a) is sectional drawing of the structure by which the contact terminal which consists of a flat mesh copper wire was interposed between the embedding part and the electroconductive thin film, ) Is a partial cross-sectional view of an electrode portion. It is the figure which showed the other structure in the heat generating element of this embodiment, (a) is sectional drawing of the structure by which the flange part was formed in the spacer with an electrode, (b) is the fragmentary sectional view of an electrode part. It is the figure which showed the conventional glass element, (a) is sectional drawing of a glass element, (b) is the fragmentary perspective view of an electrode part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating element 2 Transparent substrate 3 Conductive thin film 4 Transparent plate 5 Spacer with electrode 10 Electrode part 11 Contact terminal

Claims (5)

A heating element in which a transparent substrate having a conductive thin film formed on the back surface and a transparent plate facing the conductive thin film are laminated,
Between the transparent substrate and the transparent plate, two spacers arranged at a predetermined interval are interposed,
Each spacer is provided with an electrode portion having a contact terminal in contact with the conductive thin film,
By energizing the conductive thin film through the contact terminal of the electrode portion, the conductive thin film is configured to generate heat ,
The electrode element includes a buried portion disposed in the spacer, and the contact terminal protruding from the spacer . A heating element in which a transparent substrate having a conductive thin film formed on the back surface and a transparent plate facing the conductive thin film are laminated,
Between the transparent substrate and the transparent plate, two spacers arranged at a predetermined interval are interposed,
Each spacer is provided with an electrode portion having a contact terminal in contact with the conductive thin film,
By energizing the conductive thin film through the contact terminal of the electrode portion, the conductive thin film is configured to generate heat,
The electrode unit includes an embedded portion that is disposed in the spacer, you characterized by being composed of, and the contact terminal which is interposed between the conductive thin film and the embedded portion heat generation element. The heating element according to claim 1, wherein the electrode portion includes a plurality of the contact terminals. The contact terminals, the heat generating element according to claim 1 or claim 2, characterized in that it is biased toward the conductive thin film. A heating element in which a transparent substrate having a conductive thin film formed on the back surface and a transparent plate facing the conductive thin film are laminated,
Between the transparent substrate and the transparent plate, two spacers arranged at a predetermined interval are interposed,
Each spacer is formed with a flange portion biased toward the conductive thin film,
A heating element configured to generate heat when the conductive thin film is energized through an electrode portion interposed between the flange portion and the conductive thin film.

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