JP5434739B2 - Cooker top plate - Google Patents

Description

  The present invention relates to a top plate for a cooker. In particular, the present invention relates to a top plate for a cooker comprising a transparent crystallized glass substrate containing titanium oxide and a reflective film formed on the back surface of the transparent crystallized glass substrate.

  As a top plate for a cooker used in an electromagnetic heating (IH: Induction Heating) cooker or an infrared heating cooker, a glass substrate or a ceramic substrate having a low thermal expansion is used. Moreover, since the gas cooker is excellent in aesthetics and cleanability, a low thermal expansion glass substrate, ceramic substrate, or the like is used.

  The top plate for a cooker using these low thermal expansion substrates is required to have a low light transmittance in the visible light range in order to visually conceal parts such as a temperature sensor arranged inside the cooker. It has been. In view of this, as a top plate for a cooker having a low light transmittance in the visible light region, for example, in Patent Document 1 below, a gloss layer and a light shielding layer are formed on the back surface of a low expansion transparent crystallized glass substrate. A top plate for a cooker is disclosed. Here, the gloss layer and the light shielding layer are provided to improve the aesthetics of the cooking utensil top plate, and the color of the gloss layer and the light shielding layer is usually the gloss layer and the light shielding layer in the cooking appliance top plate. It is designed to have the highest aesthetics when the color tone appears. For example, when it is desired to obtain a top plate for a cooker having a color tone of silver, the gloss layer and the light shielding layer are designed so that the color tone of the glossy layer and the light shielding layer is a silver tone. In order to obtain a white top plate for a cooker, the gloss layer and the light shielding layer are designed so that the color tone of the gloss layer and the light shielding layer is white.

JP 2004-193050 A

  By the way, as a low expansion transparent crystallized glass substrate, a transparent crystallized glass substrate using titanium oxide as a nucleating agent is generally used at present. Since this transparent crystallized glass substrate contains titanium oxide, the light transmittance of the short wavelength side portion of the visible wavelength region is low, and the light transmittance of the transparent crystallized glass substrate becomes longer in the visible wavelength region. It gradually increases according to. Therefore, the transparent crystallized glass substrate containing titanium oxide has a yellowish color tone.

  Therefore, in the cooker top plate in which the light shielding film is formed on the back surface of the transparent crystallized glass substrate containing titanium oxide, the color tone is shifted to the yellow side from the color tone of the light shielding film. For this reason, there exists a problem that the color tone of the top plate for cooking appliances will shift | deviate from a desired color tone and the aesthetics of the top plate for cooking appliances will deteriorate.

  This invention is made | formed in view of this point, The objective is the top for cookers provided with the transparent crystallized glass substrate containing a titanium oxide, and the reflective film formed in the back surface of a transparent crystallized glass substrate. An object of the present invention is to provide a top plate for a cooker that is a plate and has excellent aesthetics.

  The top plate for a cooker according to the present invention includes a transparent crystallized glass substrate containing titanium oxide, and a reflective film formed on the back surface of the transparent crystallized glass substrate. The reflective film reflects light in at least a part of the visible wavelength range. The top plate for a cooker according to the present invention is formed between the transparent crystallized glass substrate and the reflective film, and further includes a color tone correction film in which the light transmittance gradually decreases as the wavelength increases in the visible wavelength range. Yes. In the visible wavelength range, the reflection film and the color tone correction film have an average light reflectance at the interface between the color tone correction film and the transparent crystallized glass substrate, and the average light reflection at the interface between the color tone correction film and the reflection film. It is comprised so that it may become lower than a rate. For this reason, in the present invention, in the visible wavelength range, the reflected light at the interface between the color correction film and the transparent crystallized glass substrate is weak, and the reflected light at the interface between the color correction film and the transparent crystallized glass substrate And the generation of interference light with the reflected light at the interface between the color tone correction film and the reflective film is suppressed.

  Here, normally, the light transmittance in the visible light region of the transparent crystallized glass substrate containing titanium oxide gradually increases as the wavelength becomes longer. Therefore, according to the present invention, by forming a color correction film in which the light transmittance gradually decreases as the wavelength increases in the visible wavelength region between the transparent crystallized glass substrate containing titanium oxide and the reflective film, The wavelength dependency in the visible wavelength region of the light transmittance transmitted through the crystallized glass substrate and the color tone correction film can be reduced. Therefore, the color tone of the top plate for a cooker can be brought close to the color tone of the reflective film. As a result, a top plate for a cooker that is excellent in aesthetics can be realized.

  In the present invention, titanium oxide contained in the transparent crystallized glass substrate may be contained as a nucleating agent.

  In the present invention, the “transparent crystallized glass substrate” is a crystallized glass substrate having an average light transmittance in the visible wavelength region of 50% or more.

  In the present invention, the “visible wavelength region” is 400 nm to 750 nm. “Visible light” is light having a wavelength belonging to the visible wavelength range.

  The top plate for a cooking device according to the present invention is a material that is suitably used for various cooking devices such as an electromagnetic heating (IH: Induction Heating) cooking device, an infrared heating cooking device, and a gas cooking device. The kind of cooker in which the top plate for cookers according to the present invention is used is not particularly limited.

  In the present invention, the color tone correction film is configured so that the value obtained by multiplying the light transmittance of the transparent crystallized glass substrate and the light transmittance of the color tone correction film is constant in the visible wavelength range. It is preferable. That is, it is preferable that the color tone of the transparent crystallized glass substrate and the color tone of the color tone correction film have a complementary color relationship. In this case, the color tone of the cooker top plate can be made closer to the color tone of the reflective film. As a result, a top plate for a cooker that is more aesthetic can be realized.

  "In the visible wavelength range, the value obtained by multiplying the light transmittance of the transparent crystallized glass substrate and the light transmittance of the color correction film is constant" means that the transparent crystallized glass substrate in the visible wavelength range The absolute value of the difference between the maximum and minimum values of the light transmittance of the entire color correction film and the average light transmittance of the transparent crystallized glass substrate and the entire color correction film in the visible wavelength range is 1.0% or less. Say something.

  In the present invention, the configuration of the color tone correction film is not particularly limited as long as the light transmittance gradually decreases as the wavelength increases. The color tone correction film can be constituted by, for example, a laminated film in which a low refractive index film having a relatively low refractive index and a high refractive index film having a relatively high refractive index are alternately laminated. In that case, the low refractive index film can be formed of, for example, silicon oxide or silicon nitride. On the other hand, the high refractive index film can be formed of, for example, one or more oxides or nitrides selected from the group consisting of Ti, Zr, Nb, W, and Ta.

  In the present invention, the reflective film may be made of a metal selected from the group consisting of Ti, Nb and Si, or an alloy containing one or more metals selected from the group consisting of Ti, Nb and Si. . For example, by forming a silver-like reflective film made of Ti or the like, it is possible to obtain a silver-like top plate for a cooker that is excellent in aesthetics.

  In the present invention, the color tone correction film is preferably configured so that an average light reflectance at an interface between the color tone correction film and the transparent crystallized glass substrate is 20% or less in the visible wavelength range. In this case, the color tone of the cooker top plate can be made closer to the color tone of the reflective film. As a result, a top plate for a cooker that is further excellent in aesthetics can be realized.

  According to the present invention, a top plate for a cooker comprising a transparent crystallized glass substrate containing titanium oxide and a reflective film formed on the back surface of the transparent crystallized glass substrate, the top for a cooker having excellent aesthetics A plate can be provided.

It is a schematic sectional drawing of the top plate for cookers which concerns on one Embodiment which implemented this invention. It is schematic-drawing sectional drawing which expanded a part of top plate for cookers which concerns on one Embodiment which implemented this invention. It is a graph showing the light transmittance of the transparent crystallized glass substrate, the light transmittance of the color tone correction film, and the light transmittance of the entire transparent crystallized glass substrate and the color tone correction film in the top plate for a cooker in the examples.

  FIG. 1 is a schematic cross-sectional view of a top plate for a cooker according to an embodiment of the present invention. FIG. 2 is an enlarged schematic cross-sectional view of a part of a top plate for a cooker according to an embodiment of the present invention.

  Hereinafter, a preferred embodiment in which the present invention is implemented will be described using the top plate 1 for a cooking device shown in FIG. 1 as an example. However, the cooker top plate 1 is merely an example. The cooker top plate according to the present invention is not limited to the cooker top plate 1.

  As shown in FIG. 1, the cooker top plate 1 includes a transparent crystallized glass substrate 2. The main surface 2a on one side of the transparent crystallized glass substrate 2 is a cooking surface on which the cooking device is disposed.

The transparent crystallized glass substrate 2 contains titanium oxide such as TiO ₂ . That is, the transparent crystallized glass substrate 2 contains titanium atoms. Specifically, in this embodiment, the transparent crystallized glass substrate 2 contains titanium oxide as a nucleating agent. That is, at least a part of titanium oxide contained in the transparent crystallized glass substrate 2 is produced by crystallizing an uncrystallized glass substrate (crystalline glass substrate) to produce the transparent crystallized glass substrate 2. This is a nucleating agent for crystals deposited on the transparent crystallized glass substrate 2.

Thus, since the transparent crystallized glass substrate 2 contains titanium oxide, the transmittance | permeability in the short wavelength side part of a visible wavelength region is low. Moreover, the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2 gradually increases as the wavelength becomes longer. Specifically, λ _T5 of the transparent crystallized glass substrate 2 is about 350 nm to 360 nm, and λ _T80 of the transparent crystallized glass substrate 2 is about 450 nm to 470 nm. Here, λ _T5 is the minimum value in the wavelength region that is 5% or more of the maximum value of the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2. Here, _λT80 is the minimum value in the wavelength region that is 80% or more of the maximum value of the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2.

  Although content of the titanium oxide in the transparent crystallized glass substrate 2 is not specifically limited, For example, it is preferable that they are 1 mass%-5 mass%, and it is more preferable that they are 1.5 mass%-3 mass%. If the content of titanium oxide in the transparent crystallized glass substrate 2 is too small, crystallization is difficult and, for example, desired characteristics such as a thermal expansion coefficient may not be obtained. If the content of titanium oxide in the transparent crystallized glass substrate 2 is too large, the glass may be devitrified when the original glass is formed.

The composition of the transparent crystallized glass substrate 2 is not particularly limited as long as it contains titanium oxide. The transparent crystallized glass substrate 2 may be Li ₂ O—Al ₂ O ₃ —SiO ₂ based crystallized glass having a β-spodumene solid solution or a β-quartz solid solution as a main crystal.

  A reflective film 4 is formed on the back surface 2 b of the transparent crystallized glass substrate 2. The reflective film 4 is a film that reflects light in at least a part of the visible wavelength range. That is, the reflective film 4 is a film having a color tone other than black.

  The reflective film 4 is a film for imparting a desired color tone to the cooking device top plate 1. For example, when trying to obtain the top plate 1 for white cooker, the white reflective film 4 is provided. For example, when it is going to obtain the top plate 1 for cookware of silver tone, the reflective film 4 of silver tone is provided.

The configuration of the reflective film 4 can be appropriately set according to the color tone to be obtained. For example, when it is desired to obtain the top plate 1 for white cooker, the reflective film 4 can be composed of a white inorganic pigment layer containing a white inorganic pigment. Examples of white inorganic pigments include rutile (titanium oxide) and ZrO ₂ .

  For example, when it is desired to obtain the metallic cooktop plate 1, the reflective film 4 is selected from, for example, a metal selected from the group consisting of Ti, Nb and Si, or a group consisting of Ti, Nb and Si. It can be composed of a film made of an alloy containing one or more metals.

  Moreover, for example, colored dots may be formed on the surface of the reflective film 4 on the transparent crystallized glass substrate 2 side.

  A color correction film 3 is formed between the back surface 2 b of the transparent crystallized glass substrate 2 and the reflective film 4. The color tone correction film 3 is a film for correcting the color tone of the reflected light 12 of the light 10 incident on the cooker top plate 1.

  The color correction film 3 is configured such that the light transmittance of the color correction film 3 in the visible wavelength region gradually decreases as the wavelength increases.

  Further, the color tone correction film 3 and the reflection film 4 have an average reflectance at the interface between the color tone correction film 3 and the transparent crystallized glass substrate 2 in the visible wavelength range. It is comprised so that it may become lower than the average reflectance in the interface between. Specifically, for example, the color tone correction film 3 and the transparent crystal are formed by forming the color tone correction film 3 as a dielectric multilayer film and the reflective film 4 by the metal film, alloy film, or white inorganic pigment layer as described above. The average reflectance at the interface with the vitrified glass substrate 2 is set lower than the average reflectance at the interface between the color tone correction film 3 and the reflection film 4. For this reason, in the present embodiment, the reflected light at the interface between the color tone correction film 3 and the transparent crystallized glass substrate 2 is weak in the visible wavelength range, and the gap between the color tone correction film 3 and the transparent crystallized glass substrate 2 is weak. Generation of interference light between the reflected light at the interface and the reflected light at the interface between the color tone correction film 3 and the reflective film 4 is suppressed.

  In addition, it is preferable that the color tone correction | amendment film | membrane 3 is comprised so that the average light reflectance in the interface between the color tone correction | amendment film | membrane 3 and the transparent crystallized glass substrate 2 may be 20% or less in a visible wavelength range.

  By the way, for example, when the color tone correction film 3 is not formed and a reflective film is formed immediately above the transparent crystallized glass substrate, the reflected light at the interface between the reflective film and the transparent crystallized glass substrate is transparent. Since the light has passed through the crystallized glass substrate, the color tone of the reflected light is shifted due to light absorption in the transparent crystallized glass substrate 2. Specifically, as described above, the transparent crystallized glass substrate has absorption in the short wavelength side portion of the visible wavelength region, and the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2 is the wavelength. It gradually increases as it gets longer. For this reason, the light on the short wavelength side of the incident light is absorbed by the transparent crystallized glass substrate. Therefore, the reflected light is light having a color tone shifted to the yellow side from the color tone of the reflective film 4. Therefore, the color tone of the top plate for cooking appliances deviates from the color tone of the reflective film 4, and the aesthetics of the top plate for cooking appliances deteriorate.

  For example, even when a silver-like reflective film made of a Ti film or the like is provided, the color tone of the cooker top plate becomes a gold tone. Moreover, even if it is a case where a white reflective film is provided, the color tone of the top plate for cookers will be yellow.

  On the other hand, in this embodiment, the reflected light 12 is light transmitted through the color tone correction film 3 and the transparent crystallized glass substrate 2.

  Here, in the present embodiment, the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2 gradually increases as the wavelength becomes longer, while the light transmittance in the visible wavelength region of the color tone correction film 3 has a longer wavelength. It gradually decreases as it becomes. For this reason, the incident light 10 is mainly absorbed by the transparent crystallized glass substrate 2 in the short wavelength side portion in the visible wavelength range, and in the color tone correction film 3 by the long wavelength side portion light in the visible wavelength range. Mainly absorbed. Therefore, in this embodiment, the difference between the color tone of the light incident on the cooker top plate 1 and the color tone of the light reaching the reflective film 4 out of the incident light is greater than when the color tone correction film 3 is not provided. Is small. Similarly to the incident light 10, the light 12 reflected by the reflective film 4 passes through the transparent crystallized glass substrate 2 and the color tone correction film 3 once each. Therefore, the difference in color tone between the reflected light 12 in the reflective film 4 and the light emitted from the cooker top plate 1 out of the reflected light is smaller than when the color tone correction film 3 is not provided. Therefore, in the present embodiment in which the color tone correction film 3 is provided, the color tone of the reflected light 12 is different from the color tone of the reflected light of the light directly incident on the reflective film 4 as compared with the case where the color tone correction film 3 is not provided. Get closer. As a result, the cooking device top plate 1 having a color tone close to a desired color tone to be realized by the reflective film 4 and excellent in beauty can be realized.

  Further, the color tone correction film 3 is configured such that the value obtained by multiplying the light transmittance of the transparent crystallized glass substrate 2 and the light transmittance of the color tone correction film 3 is constant in the visible wavelength range. Preferably it is. That is, it is preferable that the color tone of the transparent crystallized glass substrate 2 and the color tone of the color tone correction film 3 have a complementary color relationship. In this configuration, the color tone of the reflected light 12 becomes closer to the color tone of the reflective film 4. Therefore, the aesthetics of the cooker top plate 1 can be further improved.

  The film configuration and film thickness of the color tone correction film 3 are not particularly limited as long as the light transmittance in the visible wavelength range of the color tone correction film 3 is configured to gradually decrease as the wavelength increases. For example, as shown in FIG. 2, the color correction film 3 is a laminate in which a plurality of low refractive index films 3 </ b> L having a relatively low refractive index and a plurality of high refractive index films 3 </ b> H having a relatively high refractive index are alternately laminated. It can be constituted by a film. The low refractive index film 3L can be formed of, for example, silicon oxide or silicon nitride. On the other hand, the high refractive index film 3H can be formed of, for example, one or more oxides or nitrides selected from the group consisting of Ti, Zr, Nb, W, and Ta.

  Note that a laminated film in which a plurality of low refractive index films having a relatively low refractive index and high refractive index films having a relatively high refractive index are alternately laminated usually has a light transmittance or light absorption in the visible wavelength region. Has a rate peak.

  On the other hand, the color tone correction film 3 of this embodiment does not have a peak of light transmittance or light absorption in the visible wavelength range, and the light transmittance in the visible wavelength range gradually decreases as the wavelength increases. It is a feature.

  In order to realize the color tone correction film 3 having such characteristics, it is necessary to design the color tone correction film 3 so that the peak of light transmittance is shorter than the visible wavelength region, that is, 400 nm or less. . In order to set the light transmittance peak of the color tone correction film 3 to a shorter wavelength side than the visible wavelength region, the color tone correction film 3 is alternately laminated with six or more high refractive index films 3H and low refractive index films 3L. The total physical film thickness of the color tone correction film 3 is 400 nm or less, the physical film thickness of each layer is in the range of 10 to 120 nm, and the film in contact with the transparent crystallized glass substrate is a high refractive index film. preferable. More specifically, the color tone correction film 3 includes, from the glass substrate 2 side, a first high refractive index film having a physical film thickness of 20 to 25 nm and a first low refractive index film having a physical film thickness of 25 to 30 nm. A second high refractive index film having a physical film thickness of 55 to 60 nm, a second low refractive index film having a physical film thickness of 85 to 100 nm, and a third high refractive index having a physical film thickness of 55 to 60 nm. The film and the third low refractive index film having a physical film thickness of 35 to 50 nm are included in this order, and the total physical film thickness of the color tone correction film 3 is 275 to 325 nm. Is preferred.

Example 1
Hereinafter, the present invention will be described in more detail. However, the present invention is not limited to the following examples, and can be appropriately modified and implemented without departing from the scope of the present invention.
On a transparent crystallized glass substrate 2 (Neoceram N-0 manufactured by Nippon Electric Glass Co., Ltd.), a color tone correction film 3 having a film configuration shown in Table 1 below was formed by sputtering. On top of that, a white reflective film 4 made of a silicone resin containing 50% by weight of a white pigment of titanium oxide and having a thickness of 10 μm is formed by a screen printing method, whereby cooking having the same configuration as in the above embodiment is performed. A device top plate was prepared.

  In addition, the transparent crystallized glass substrate 2 used in the present Example 1 has a β-quartz solid solution as a main crystal. Further, the content of titanium oxide in the transparent crystallized glass substrate used in Example 1 was 1.9% by mass.

(Example 2)
A top plate for a cooker having the same configuration as in Example 1 was prepared, except that the silver metallic reflective film 4 made of metal Ti and having a thickness of 100 nm was formed by sputtering.

  The color tone of the cooker top plate produced in Examples 1 and 2 above was measured from the main surface side of the transparent crystallized glass substrate with reflected light using an Ultrascan manufactured by HunterLab. Further, the color tone of the reflective film 4 alone was measured with reflected light from the back side of the reflective film 4 using an Ultrascan manufactured by HunterLab. As a result, the color tone of the cooker top plate produced in Examples 1 and 2 was almost the same as the color tone of each reflective film 4 alone.

  Next, the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2 alone was measured using an Ultrascan manufactured by HunterLab. In addition, a color tone correction film 3 having the same film configuration as that of Example 1 is formed on the same transparent crystallized glass substrate as that used in Example 1 by the same procedure as that of Example 1, and color tone correction is performed. The total light transmittance of the film 3 and the transparent crystallized glass substrate was measured using an Ultrascan manufactured by HunterLab.

  From the light transmittance of the transparent crystallized glass substrate measured above and the total light transmittance of the color tone correction film 3 and the transparent crystallized glass substrate, the light transmittance of the color tone correction film 3 alone was calculated. The results are shown in FIG. In addition, in FIG. 3, the graph shown with a dashed line represents the light transmittance of a transparent crystallized glass substrate. A graph indicated by a two-dot broken line represents the light transmittance of the color tone correction film 3. A graph indicated by a solid line represents the entire light transmittance of the color tone correction film 3 and the transparent crystallized glass substrate.

  From the results shown in FIG. 3, it can be seen that the light transmittance in the visible wavelength region of the transparent crystallized glass substrate 2 gradually decreases as the wavelength becomes shorter. On the other hand, it can be seen that the light transmittance of the color correction film 3 in the visible wavelength region gradually increases as the wavelength becomes shorter. Moreover, it turns out that the light transmittance in the visible wavelength range of the whole transparent crystallized glass substrate and the color tone correction film is substantially constant regardless of the wavelength.

DESCRIPTION OF SYMBOLS 1 ... Top plate 2 for cooker ... Transparent crystallized glass substrate 3 ... Color tone correction film 3H ... High refractive index film 3L ... Low refractive index film 4 ... Reflective film 10 ... Incident light 12 ... Reflected light

Claims (7)

A top plate for a cooker comprising: a transparent crystallized glass substrate containing titanium oxide; and a reflective film that is formed on the back surface of the transparent crystallized glass substrate and reflects light in at least a part of the visible wavelength range. There,
A color tone correction film that is formed between the transparent crystallized glass substrate and the reflection film, and in the visible wavelength range, the light transmittance gradually decreases as the wavelength becomes longer,
The reflection film and the color tone correction film have an average light reflectance at an interface between the color tone correction film and the transparent crystallized glass substrate in a visible wavelength range, between the color tone correction film and the reflection film. A top plate for a cooking appliance that is configured to be lower than the average light reflectance at the interface.   The color tone correction film is configured such that a value obtained by multiplying the light transmittance of the transparent crystallized glass substrate and the light transmittance of the color tone correction film is constant in a visible wavelength region. The top plate for a cooker according to 1.   The top plate for a cooker according to claim 1 or 2, wherein a color tone of the transparent crystallized glass substrate and a color tone of the color tone correction film are in a complementary color relationship.   The color tone correction film is a laminated film in which a low refractive index film having a relatively low refractive index and a high refractive index film having a relatively high refractive index are alternately laminated. The top plate for a cooker described in the item.   The reflective film is made of a metal selected from the group consisting of Ti, Nb and Si, or an alloy containing one or more metals selected from the group consisting of Ti, Nb and Si. The top plate for a cooker according to one item.   The top plate for a cooking appliance according to any one of claims 1 to 5, wherein the light transmittance in the visible wavelength region of the transparent crystallized glass substrate gradually increases as the wavelength increases.   The color tone correction film is configured so that an average light reflectance at an interface between the color tone correction film and the transparent crystallized glass substrate is 20% or less in a visible wavelength region. The top plate for cooking appliances as described in any one of Claims.

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