JP2010092650A - Glass top plate for cooking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass top plate wherein the top face operating part of a cooking device can be formed into a touch panel. <P>SOLUTION: This glass top plate has a glass board 2 and a touch panel layer 3 directly formed on the back side 21 forming the side opposite to the cooking side of the glass board 2. The touch panel layer 3 has a transparent conductive film 31 directly formed on the back side 21 of the glass board 2, and a lead electrode 32 formed on the backside 21 so as to make contact with the transparent conductive film 31, and a transparent conductive layer 33 formed on the backside 21 so as to cover the transparent conductive film 31. The transparent conductive film 31 is formed by using an oxide semiconductor. The display of a display plate disposed in the lower part of the glass plate 1 for the cooking device is formed so that it is visible from the upper part of the glass top plate 1 for the cooking device through the touch panel layer 3. The thickness of the transparent conductive film 31 is preferably 10 nm-1,000 nm. The lead electrode 32 is preferably made of a noble metal film or a conductive particulate dispersed film. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a glass top plate for a cooker that is placed on top of the cooker.

  Conventionally, a glass top plate for a cooker made of a glass plate is installed on the top of a cooker such as an electromagnetic cooker or a gas cooker. On the glass top plate for a cooker, an object to be heated, such as a pan, is placed. Can cook. In particular, electromagnetic cookers tend to increase in demand in recent years because of their high safety, and accordingly, the demand for glass top plates for cookers is also increasing.

  And the glass touch type top surface operation type cooking appliance which enabled main operation on the cooking surface has spread (Patent Document 1). In this cooking device, a carbon electrode may be formed on a glass top plate as a wiring circuit of a touch operation panel. The carbon electrode is made to correspond to the top surface operation by forming the carbon electrode at a required place (portion corresponding to the switch) on the back surface of the glass top plate. In addition, when a carbon electrode is employ | adopted, the part becomes the external appearance painted out.

In addition, touch panels are widely used as input means for various devices such as calculators, remote controllers, telephones, copiers, electronic notebooks, control devices, portable terminals, game devices, and educational devices. The touch panel is used to input a signal to the drive circuit with a finger or a pen tip while looking at the display screen.
And as a touch panel, there exist some which have the structure which gave the electrically conductive material on the glass plate, for example. In this case, a uniform electric field is generated on the glass surface, and when a finger touches the panel surface, the state of the electric field on the glass surface changes via the finger, and a weak current is generated at the four corners. It is generated and the touched position is detected by calculating each ratio.

JP 2008-202904 A

In recent years, there has been an increasing demand for a touch panel for the top surface operation unit of the cooking device.
However, in the conventional touch panel, the heat resistant temperature is 85 ° C. even for in-vehicle use, and the heat resistance is insufficient. For this reason, it is difficult to directly form a touch panel on the top plate that is close to the cooking unit and has a high temperature of about 200 ° C. during cooking.
In addition, in order to prevent the touch panel from becoming hot, it is conceivable to adopt a method in which a space is provided under the top plate and the touch panel is installed. There is a problem that there are many elements and the appearance is not good.

  This invention is made | formed in view of this conventional request | requirement, Comprising: It aims at providing the glass top plate which can change the top | upper surface operation part of a cooking appliance into a touch panel.

The present invention is a top plate for a cooker for placement on the top of the cooker,
A glass substrate and a touch panel layer directly formed on the back side surface, which is the surface opposite to the cooking surface of the glass substrate,
The touch panel layer includes a transparent conductive film directly formed on the back side of the glass substrate;
A lead electrode formed on the back side so as to contact the transparent conductive film;
A transparent protective layer formed on the back side so as to cover the transparent conductive film,
The transparent conductive film is formed using an oxide semiconductor,
And the glass for cooking appliances comprised so that the display of the display board arrange | positioned under the said glass top plate for cooking appliances can be visually recognized from the upper direction of the said glass top plate for cooking appliances via the said touch panel layer. It exists in a top plate (Claim 1).

  The said glass top plate for cookers can have heat resistance, durability, and visibility by having the said structure, and can make the top | upper surface operation part of a cooker into a touch panel.

That is, since the touch panel layer is directly provided on the back side of the glass substrate, the glass top plate for a cooker has a good touch response and excellent switch performance.
Moreover, since the said touch panel layer is provided in the back side surface of the said glass substrate, the damage of the said touch panel layer can be prevented, durability can be acquired, and the connection with the apparatus of the cooker main body is favorable. Can be done.

  The above-mentioned semiconductor oxide is obtained by doping a suitable oxide to develop conductivity, and has heat resistance. And since the said transparent conductive film is formed using the semiconductor oxide which is a conductive material which has heat resistance, it does not change in a high temperature environment of about 200 degreeC, and can have sufficient heat resistance.

Here, the transparent conductive film formed using the above-described semiconductor oxide is conspicuous by itself.
Therefore, by providing the transparent protective layer so as to cover the transparent conductive film, the presence of the transparent conductive film with glare can be reduced, and the display plate disposed below the cooker glass top plate The display can be configured to be visible from above the glass top plate for a cooker through the touch panel layer. In addition, even when there are irregularities on the back side surface of the glass substrate, the presence of the irregularities can be reduced by providing the transparent protective layer. Thus, reflection and reflection of outside light can be prevented by the transparent protective layer, and when the display on the display plate arranged below the glass top plate for a cooker is viewed through the touch panel layer. Visibility can be improved.

As mentioned above, according to this invention, it turns out that the glass top plate which can change the top | upper surface operation part of a cooking appliance into a touch panel can be provided.
In addition, by converting the top surface operation into a touch panel, it is possible to reduce the size of the operation unit even in a cooking device with complicated operations. Therefore, the operation can be made easier to understand than a conventional cooking device employing a top surface operation, and the design of the glass top plate can be prevented from being bothered by the operation unit.

As described above, the glass top plate for a cooker according to the present invention includes a glass substrate and a touch panel layer directly formed on the back side surface that is the surface opposite to the cooking surface of the glass substrate.
The glass substrate preferably has a linear thermal expansion coefficient of −10 to 80 × 10 ⁻⁷ / ° C. (30 to 500 ° C.), and has β-quartz solid solution and β-spodumene as the main crystal. Is more preferable.

The touch panel layer covers the transparent conductive film directly formed on the back side of the glass substrate, the lead electrode formed on the back side so as to be in contact with the transparent conductive film, and the transparent conductive film. Thus, it has the transparent protective layer formed in the said back side surface.
Moreover, since the said touch panel layer requires the visibility at the time of recognizing the display of the display screen provided under this touch panel layer, the said transparent conductive film and the said transparent protective layer need to be transparent.

Moreover, since the said lead electrode connects the weak electric current which generate | occur | produces in the said transparent conductive film to the apparatus of a cooker main body, it needs to contact the said transparent conductive film.
The lead electrode is preferably formed by printing.
The transparent conductive film is preferably formed in a rectangular shape, and the lead electrodes are preferably provided at the four corners of the transparent conductive film.

In addition, when comprising a touch panel using the said glass top plate for cookers, it is preferable that the connection of a lead electrode and the electrode of the cooker main body side is a mechanical contact connection.
If solder bonding is performed at the time of electrode connection, peeling may occur between the low thermal expansion glass substrate and the metal, and therefore, it is preferable to use mechanical contact connection.
Therefore, in order to prevent contact with the transparent conductive film during assembly, it is preferable to form the lead electrode so that the contact connection portion is located sufficiently away from the transparent conductive film.

Moreover, when the said transparent protective layer is not provided, the display of the display board arrange | positioned under the said glass top plate for cookers is visually recognized from the upper direction of the said glass top plate for cookers via the said touch panel layer. There is a problem that the visibility at the time is lowered. In particular, when the back side surface of the glass substrate has irregularities, it is difficult to see due to reflection unless the transparent protective layer is provided.
The display board displays image information received from the outside such as a computer on a liquid crystal display or the like, and is provided in the cooker body.
In addition, it is preferable that the touchscreen comprised using the glass top plate for cookers of this invention is an electrostatic capacitance system.

In the glass top plate for a cooker, the oxide semiconductor may be one of In ₂ O ₃ oxide semiconductor, SnO ₂ oxide semiconductor, ZnO oxide oxide, and TiO ₂ oxide semiconductor, or It is preferable that it consists of 2 or more types (Claim 2).
In this case, in particular, a transparent conductive film having heat resistance and conductivity can be obtained.

Examples of the oxide semiconductor include In ₂ O ₃ -based oxide semiconductors, SnO ₂ -based oxide semiconductors, ZnO-based oxide semiconductors, and TiO ₂ -based oxide semiconductors as described above.
Examples of In ₂ O ₃ oxide semiconductors include ITO [In ₂ O ₃ —Sn], IZO [In ₂ O ₃ —ZnO amorphous oxide], and the like.
As the SnO ₂ based oxide semiconductor, for _{example, SnO 2, FTO [SnO 2} -F], ATO [SnO 2 -Sb] , and the like.

In addition, examples of the ZnO-based oxide semiconductor include ZnO, AZO [ZnO—Al], and GZO [ZnO—Ga].
As the TiO ₂ based oxide semiconductor, TNO [TiO ₂ -Nb, TiO ₂ -Ta], and the like.
Among them, the semiconductor oxide is particularly preferably the ITO.

  Moreover, since the above-mentioned ITO and ATO fine particles are infrared cut materials, when they are used to form a transparent conductive film, the heat generated from the cooking utensil on the top plate is placed under the top plate. Reaching the plate can be suppressed.

The transparent conductive film may be a single layer or a plurality of laminated layers.
The transparent conductive film is preferably formed by a dry method or a coating solution sintering method.
Examples of the dry method include a method of forming by sputtering.
Moreover, as said coating liquid sintering method, there exists the method of forming by baking, after apply | coating a fine particle dispersion, a thermal decomposition type liquid, etc., for example.

Moreover, it is preferable that the film thickness of the said transparent conductive film is 10 nm-1000 nm (Claim 3).
The optimum film thickness of the transparent conductive film differs depending on the material constituting the transparent conductive film, but when the film thickness is within the above range, any material can be used to achieve desired heat resistance and conductivity. Can have transparency.

  When the film thickness of the transparent conductive film is less than 10 nm, the resistance value may be too high. On the other hand, when the film thickness of the transparent conductive film exceeds 1000 nm, the transparency of the film may not be sufficiently obtained.

In addition, the lead electrode is preferably formed of a material that is resistant to rubbing from the viewpoint of slidability and stability, and is particularly preferably formed of a noble metal film or a conductive fine particle dispersed film. .
In this case, a lead electrode that is particularly resistant to contact can be obtained.

Examples of the noble metal film include thin films such as Pt, Au, Pd, and Ag.
Examples of the conductive fine particle-dispersed film include a film in which the above-mentioned noble metal or carbon fine particles are dispersed in a resin.
The lead electrode is more preferably an electrode in which carbon fine particles are dispersed in a resin.

The transparent protective layer may be made of any resin as long as it is a transparent resin having scratch resistance and heat resistance. In particular, the transparent protective layer is preferably composed mainly of silicone, polyurethane, polyimide, fluorine, epoxy, acrylic, or a modified type thereof (Claim 5).
In this case, a particularly good transparent protective layer can be formed.

Moreover, it is preferable that the film thickness of the said transparent protective layer is 1 micrometer-100 micrometers.
In this case, a particularly good transparent protective layer can be formed.

  When the film thickness of the transparent protective layer is less than 1 μm, the transparent conductive film may not be completely covered. On the other hand, when the film thickness of the transparent protective layer exceeds 100 μm, the effect of improving the protective coat cannot be obtained, which is not preferable from the viewpoint of material cost.

Further, a painting layer is further formed on the back side surface of the glass substrate, the glass substrate has a display area where no painting layer is formed, and the transparent conductive film is an area of the display area. It is preferable that it is formed inside (Claim 7).
Since the cooking device is provided with a heating device or the like, it is preferable to provide a painting layer on the glass substrate in order to conceal the internal structure. And when providing the said painting layer, you must provide except a touch panel part.

Various known layers can be applied to the painting layer. Specifically, for example, a layer composed of a raster color, a layer composed of a glass composition and an inorganic pigment, a layer composed of a pearl tone material and a silicone resin or a siliceous sol can be applied.
Moreover, the above-mentioned painting layer may laminate | stack the layer mentioned above independently, and may laminate | stack a several layer.

The lead electrode and the transparent protective layer may partially overlap the painting layer.
Moreover, it is preferable that the said painting layer is directly provided in the back side surface of the said glass substrate. The lead electrode and the protective layer may be formed so as to partially overlap the painting layer.

Example 1
This example demonstrates the glass top plate for cookers concerning the Example of this invention using FIGS. 1-7.
As shown in FIG. 1, the glass top plate 1 for a cooker of this example includes a glass substrate 2 and a touch panel layer 3 directly formed on a back side surface 21 which is a surface opposite to the cooking surface of the glass substrate 2. Have
The touch panel layer 3 includes a transparent conductive film 31 directly formed on the back side surface 21 of the glass substrate 2, a lead electrode 32 formed on the back side surface 21 so as to be in contact with the transparent conductive film 31, And a transparent protective layer 33 formed on the back side surface 21 so as to cover the transparent conductive film 31.
This will be described in detail below.

First, Neoceram N-0 (manufactured by Nippon Electric Glass Co., Ltd.) was prepared as the glass substrate 2 in preparing the glass top plate for a cooker of this example.
In addition, as a transparent conductive film material for forming the transparent conductive film 31, a commercially available ITO fine particle dispersion was prepared.
Further, as a lead electrode material for forming the lead electrode 32, carbon paste (15-25 parts by weight of spherical graphite powder, 15-25 parts by weight of scaly graphite powder, and 10-20 parts by weight of acetylene black) Part, and 40 to 55 parts by weight of a polyester silicone resin, and the spherical and scaly graphite powders were prepared as carbon pastes having an average particle size of 10 μm to 20 μm.
A commercially available alkyl-modified silicone was prepared as a material for the transparent protective layer for forming the transparent protective layer 33.

  Further, as a material for a first painting layer for forming a painting layer 4 (first painting layer 41, second painting layer 42) to be described later, a pearl-like material is 5% by mass, and a silicone resin is 30% by mass. A pearl color paint containing 60% by mass of an organic solvent and 5% by mass of a thickening resin was prepared, and a black raster painting material was prepared as a second painting layer material.

  And as shown in FIG. 2, the said transparent conductive film material was apply | coated with respect to the back side surface 21 of the said glass substrate 1, and the transparent conductive film 31 was formed by baking at 820 degreeC. The film thickness of the transparent conductive film 31 was 150 nm.

  Next, as shown in FIGS. 3 and 4, the first painting layer material is applied to the portion where the transparent conductive film 31 is not formed, and baked at 820 ° C. to thereby form the first painting layer 41. Formed. And the said 2nd painting layer material was apply | coated on the 1st painting layer 41, and the 2nd painting layer 42 was formed by baking at 820 degreeC.

Then, as shown in FIG. 5, after applying the lead electrode material so as to overlap the four corners of the transparent conductive film 31 and a part of the painting layer 4, as shown in FIG. The said transparent protective layer material was apply | coated so that the transparent conductive film 31 might be covered, and the lead electrode 32 and the transparent protective layer 33 were formed by curing at 380 degreeC, and the glass top plate 1 for cookers was obtained. The film thickness of the transparent protective layer 33 was 5 μm.
Moreover, the figure which looked at the glass top plate 1 for cookers of this example from the cooking surface side is shown in FIG.

The glass top plate 1 for a cooker of this example can have heat resistance, durability, and visibility by having the above-described configuration, and the top surface operation unit of the cooker can be made into a touch panel.
That is, since the touch panel layer 3 is directly provided on the back side surface 21 of the glass substrate 2, the glass top plate 1 for a cooking device has a good touch response and excellent switch performance.
Moreover, since the said touch panel layer 3 is provided in the back side surface 21 of the said glass substrate 2, damage to the said touch panel layer 3 can be prevented and durability can be acquired.

  Further, since the transparent conductive film 31 is formed using a semiconductor oxide that is a conductive material having heat resistance, the transparent conductive film 31 does not change even under a high temperature environment of about 200 ° C. and can have sufficient heat resistance.

  Further, by providing the transparent protective layer 33 so as to cover the transparent conductive film 31, the presence of the transparent conductive film 31 with glare can be reduced, and information on the display board of the cooker body can be easily recognized. A touch panel can be configured. Moreover, the presence of the unevenness | corrugation of the back side surface 21 of the said glass substrate 2 can be relieved. Thus, reflection and reflection of external light can be prevented by the transparent protective layer 33, and the display on the display board installed below the glass top plate 1 for the cooker is displayed via the touch panel layer 3. The visibility at the time of visual recognition can be improved.

  Thus, according to this example, it turns out that the glass top plate which can change the top | upper surface operation part of a cooking appliance into a touch panel can be provided.

(Example 2)
In this example, as shown in FIG. 8, a cooker 5 was produced using the glass top plate 1 for a cooker obtained in Example 1.
The cooker 5 of this example has a configuration in which the glass top plate 1 for a cooker is placed on a cooker body 6.

The cooker main body 6 includes a display board 61 and electrodes 62 for displaying information and operation switches.
The cooker glass top plate 1 is placed so that the lead electrode 32 is in contact with the electrode 62 of the cooker body 6. Since the touch panel layer 3 is provided on the back side surface 21 of the glass substrate 2, the glass top plate 1 for the cooker can be well connected to the electrode 62 of the cooker body 6.

Moreover, the visibility at the time of visually recognizing the display of the display board 61 arrange | positioned under the said glass top plate 1 for cooking appliances from the upper direction of the said glass top plate 1 for cooking appliances via the said touch panel layer 3 was favorable. .
Moreover, since the said glass top plate 1 for cookers has the said painting layer 4, internal structures (not shown), such as a heating apparatus provided in the cooker main body 6, can be concealed.

Explanatory drawing which shows the glass top plate for cookers in Example 1. FIG. Explanatory drawing which shows the preparation process of the glass top plate for cookers in Example 1. FIG. Explanatory drawing which shows the preparation process of the glass top plate for cookers in Example 1. FIG. Explanatory drawing which shows the preparation process of the glass top plate for cookers in Example 1. FIG. Explanatory drawing which shows the preparation process of the glass top plate for cookers in Example 1. FIG. Explanatory drawing which shows the preparation process of the glass top plate for cookers in Example 1. FIG. Explanatory drawing which shows the glass top plate for cookers in Example 1. FIG. Sectional drawing which shows the cooking device in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass top plate for cookers 2 Glass substrate 21 Back side 3 Touch panel layer 31 Transparent conductive film 32 Lead electrode 33 Transparent protective layer 4 Painting layer 41 1st painting layer 42 2nd painting layer

Claims (7)

A top plate for a cooker to be placed on top of the cooker,
A glass substrate and a touch panel layer directly formed on the back side surface, which is the surface opposite to the cooking surface of the glass substrate,
The touch panel layer includes a transparent conductive film directly formed on the back side of the glass substrate;
A lead electrode formed on the back side so as to contact the transparent conductive film;
A transparent protective layer formed on the back side so as to cover the transparent conductive film,
The transparent conductive film is formed using an oxide semiconductor,
And the glass for cooking appliances comprised so that the display of the display board arrange | positioned under the said glass top plate for cooking appliances can be visually recognized from the upper direction of the said glass top plate for cooking appliances via the said touch panel layer. Top plate. 2. The oxide semiconductor according to claim 1, wherein the oxide semiconductor includes one or more of In ₂ O ₃ -based oxide semiconductor, SnO ₂ -based oxide semiconductor, ZnO-based oxide semiconductor, and TiO ₂ -based oxide semiconductor. A glass top plate for a cooker characterized by that.   The glass top plate for a cooker according to claim 1 or 2, wherein the transparent conductive film has a thickness of 10 nm to 1000 nm.   4. The glass top plate according to claim 1, wherein the lead electrode is made of a noble metal film or a conductive fine particle dispersed film.   The transparent protective layer according to any one of claims 1 to 4, wherein the transparent protective layer is mainly composed of silicone, polyurethane, polyimide, fluorine, epoxy, acrylic, or a modified type thereof. Glass top plate for cookware.   The glass top plate for a cooker according to any one of claims 1 to 5, wherein the transparent protective layer has a thickness of 1 µm to 100 µm.   In any 1 item | term of Claims 1-6, the back side of the said glass substrate is further formed with the painting layer, The said glass substrate has a display area | region in which the painting layer is not formed, The above-mentioned The glass top plate for a cooker, wherein the transparent conductive film is formed in the display area.

Images