JP2006330288A - Light emitting display plate and heating cooking appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting display plate and a heating cooking appliance which are capable of easily forming complicated characters or patterns and enable a user to easily discriminate light emission. <P>SOLUTION: A light emitting display plate 1 used to show a heating state of the heating cooking appliance includes a glass substrate 10 made of glass ceramics and a light emitting part 4 formed in at least a part of the glass substrate. The light emitting part 4 contains a fluorescent pigment which emits light by ultraviolet rays. The heating cooking appliance includes a heating means, an ultraviolet light emitting means, and the light emitting display plate 1. The light emitting display plate 1 is so disposed that a light emitting face 12 having the light emitting part 4 formed thereon is directed toward the ultraviolet light emitting means. The ultraviolet light emitting means is configured so as to radiate ultraviolet rays to the light emitting part 4 of the light emitting display plate 1 in association with a heating operation of the heating means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light emitting display plate used in a cooking device such as an electromagnetic cooker and a heating cooker using the light emitting display plate.

  Conventionally, heating cookers such as IH electromagnetic cookers, gas cookers, halogen cookers, radiant heater cookers, and microwave ovens have been widely used. In these heating cookers, a heating means is incorporated, and a glass plate is disposed at a position facing the user, for example, outside the heating means.

Specifically, in a heating cooker such as an IH electromagnetic cooker, a gas cooker, a halogen cooker, a radiant heater cooker, etc., a glass plate is arranged as a so-called top plate. The user can place the object to be heated on the top plate and cook the object to be heated by heating means built in the cooking device.
Moreover, in a heating cooker such as a microwave oven, a glass plate is used for an open / close door provided at a takeout port for taking in and out a heated object. The user can confirm the state of the object to be heated from the glass plate portion.

In such a heating cooker, the glass plate becomes hot during operation of the built-in heating means, and there is a risk of burns if the user touches it excessively. Therefore, a means for visually expressing the operation of the heating means has been provided in the cooking device.
Specifically, a cooking device incorporating a light emitting means such as an LED has been developed (see Patent Documents 1 to 4). In such a heating cooker, the operation of the heating means can be visually identified by light emission of red, blue, or the like by an LED or the like.

  However, when light is emitted by a light emitting means such as an LED, the operation and non-operation of the heating means must be identified only by the presence / absence of light emission and the color of the light emission. In addition, in order to make it easy for the user to identify, it is possible to express characters and designs by light emission. In this case, the LED is processed in advance into a desired shape, or a large area LED is slit. It is necessary to emit light. Therefore, in this case, the production of the light emitting means becomes complicated and there is a possibility that the cost increases. In addition, when a light emitting means such as an LED is used, it is difficult to express complex characters and designs of two or more colors, and variations of characters and designs that can be expressed by the light emitting means are reduced. there were.

JP 2004-171855 A JP 2003-257600 A JP 2004-47283 A JP 2004-95260 A

  The present invention has been made in view of such conventional problems, and is capable of easily forming complex characters and pictures and enabling a user to easily identify light emission and a cooking device. Is to provide.

1st invention is the light emission display board used in order to represent the heating state of a heating cooker,
The light-emitting display panel has a glass substrate made of crystallized glass, and a light-emitting portion formed on at least a part of the glass substrate,
The light-emitting part is a light-emitting display board characterized by containing a fluorescent pigment that emits light by ultraviolet rays.

  The light emitting display panel includes the glass substrate and the light emitting unit containing the fluorescent pigment. Therefore, in the light emitting display panel, the light emitting unit can emit light when the light emitting unit is irradiated with ultraviolet rays. Therefore, for example, by irradiating the light emitting unit with ultraviolet rays in accordance with the heating operation of the heating cooker, the heating operation of the heating cooker can be visually displayed to the user or the like by the light emission of the light emitting unit. .

As the fluorescent pigment, fluorescent pigments of not only a single color but also a plurality of colors can be used. In this case, a plurality of colors can be emitted with a single light source (ultraviolet light). Therefore, it is possible to easily display two or more colors on the light-emitting display board.
The light emitting part can be formed by, for example, applying and baking a material containing the fluorescent pigment on the glass substrate in a desired shape. Therefore, it is possible to easily form the light emitting portion made of complicated characters and patterns.

  As described above, according to the first aspect, it is possible to provide a light-emitting display board that can easily form complex characters and patterns and that allows the user to easily identify light emission.

The second invention is a heating cooker having a heating means, an ultraviolet light emitting means, and a light emitting display plate,
As the light-emitting display board, the light-emitting display board of the first invention is adopted,
The light emitting display plate is arranged with the light emitting surface side on which the light emitting part is formed facing the ultraviolet ray generating means side,
The ultraviolet ray generating means is a heating cooker configured to irradiate the light emitting portion of the light emitting display plate with ultraviolet rays in relation to the heating operation of the heating means (Claim 9). .

  In the heating cooker, the light emitting display plate of the first invention is adopted. For this reason, when the light emitting part of the light emitting display panel is irradiated with ultraviolet rays in relation to the heating operation of the heating means, the light emitting part emits light. Therefore, the user of the heating cooker can easily identify the heating operation of the heating means by looking at the light emitting display board.

Moreover, in the heating cooker, the light emitting display plate is arranged with the light emitting surface side on which the light emitting portion is formed facing the ultraviolet light emitting means side. Therefore, the user of the cooking device can visually recognize the light emission of the light emitting unit that passes through the glass substrate by viewing the light emitting display board from the surface (use surface) opposite to the light emitting surface. .
Other functions and effects are the same as those of the first invention.

Next, a preferred embodiment of the present invention will be described.
The said light emission display board is used in order to represent the heating state of a heating cooker.
Examples of the heating cooker include an IH electromagnetic cooker, a gas cooker, a halogen cooker, a radiant heater cooker, and a microwave oven. The said light emission display board can be used for top plates, such as an IH electromagnetic cooker, a gas cooker, a halogen cooker, a radiant heater cooker, the glass plate of the opening / closing door of a microwave oven, etc., for example.

The light-emitting display panel includes a glass substrate made of crystallized glass and a light-emitting portion formed on at least a part of the glass substrate.
The light emitting part can be formed on the glass substrate so as to be in direct contact therewith, but can also be formed with a light shielding layer or a decoration layer interposed therebetween as described later.

The light emitting part contains a fluorescent pigment that emits light by ultraviolet rays.
As the fluorescent pigment, for example, the following inorganic pigments can be used depending on the type of color to emit light.
Specifically, for example, blue-based pigments include Y ₂ SiO ₅ doped with Tb and Ce, ZnS doped with Ag, BaMg ₂ Al ₁₆ O ₂₇ doped with Eu, Sr ₅ (PO ₄ ) Pigment doped with Eu in ₃ Cl, Pigment doped with Eu in (BaMg) Al ₈ O ₁₀ , Pigment doped with Ag and Al in ZnS, Pigment doped with Eu in BaMgAl ₁₀ O ₁₇ , containing CaWO ₄ Pigments, and (SrCaBaMg) ₅ (PO ₄ ) ₃ Cl doped with Eu.

Examples of the purple type include a pigment obtained by doping Eu with SrP ₂ O ₇ . Examples of the green system include a pigment in which ZnS is doped with Cu, a pigment in which Zn ₂ SiO ₄ is doped with Mn, a pigment in which BaMg ₂ Al ₁₆ O ₂₇ is doped with Eu and Mn, and Eu in (BaMg) Al ₁₁ O _18.5 . And a pigment doped with Mn in ZnS. The red system includes a pigment in which CaSiO ₃ is doped with Mn and Pb, a pigment in which La ₂ O ₂ S is doped with Eu, a pigment in which Y ₂ O ₂ S is doped with Eu, and a pigment in which Y ₂ O ₃ is doped with Eu. , Y (PV) O ₄ and the like doped with Eu. These pigments can be mixed and used at an arbitrary ratio so as to obtain a desired color.

  By using the above inorganic pigment as the fluorescent pigment, it is possible to prevent the light emitting part from peeling off or cracking in the light emitting part even in a high temperature environment of, for example, a temperature of 400 ° C. or higher. In addition, the light-emitting display panel has excellent thermal durability suitable for the cooking device.

The light-emitting part preferably contains a phosphorescent pigment (claim 2).
In this case, the light emitting unit can maintain the light emission of the light emitting unit for a while even if the irradiation of the ultraviolet ray is stopped after emitting the light by the ultraviolet ray.
As the phosphorescent pigment, for example, the following pigments can be used depending on the type of color to emit light.
Specifically, as the blue type, there are a pigment in which CaAl ₂ O ₃ is doped with Eu and Nd, a pigment in which Sr ₄ Al ₁₄ O ₂₅ is doped with Eu and Dy, and the like. The green type includes a pigment in which Eu and Dy are doped into SrAl ₂ O ₄ , and the red type includes a pigment in which Eu ₂ Mg is doped into Y ₂ O ₂ S.

The light emitting part is prepared by mixing 50 to 300 parts by weight of an organic binder with respect to 100 parts by weight of a total amount of 20 to 100 parts by weight of the fluorescent pigment and the phosphorescent pigment and 0 to 80 parts by weight of a glass flux. It is preferable that the light emitting paste material is applied to the glass substrate and fired.
In this case, the light emitting part can be easily formed on the glass substrate, and the light emitting part can be adhered to the glass substrate with excellent adhesion.

In the light emitting paste material, when the total amount of the fluorescent pigment and the phosphorescent pigment is less than 20 parts by weight or when the glass flux exceeds 80 parts by weight, the light emission by the ultraviolet rays in the light emitting part may be weakened. is there. When the organic binder is less than 50 parts by weight, it may be difficult to form the paste material in a desired shape and uniform thickness when the paste material is applied to the glass substrate by, for example, screen printing. is there. On the other hand, when the organic binder exceeds 300 parts by weight, the organic binder tends to remain after firing, and as a result, the light emitting part may be blackened after firing.
Moreover, in the said light emission paste material, content of glass flux can be 0 weight part. When the light emitting part is formed so as to be in direct contact with the glass substrate, the light emitting paste material preferably contains a glass flux. In this case, the adhesion between the light emitting part and the glass substrate can be improved.

Examples of the glass flux include SiO ₂ of 56 to 69 wt%, Al ₂ O ₃ of 0 to 4 wt%, B ₂ O ₃ of 23 to 30 wt%, Li ₂ O of 0.1 to 3 wt%, Na ₂ O 1-5 wt%, 0-4 wt% of K ₂ O, the TiO ₂ 0 to 5 wt%, and ZrO ₂ can be used those containing 1 to 5 wt%.

When the content of SiO ₂ in the glass flux is less than 56% by weight, the thermal expansion coefficient of the light emitting part is increased and the thermal expansion difference from the glass substrate may be increased. Therefore, there exists a possibility that a crack may generate | occur | produce or the said light emission part may peel. On the other hand, when it exceeds 69% by weight, the viscous flow of the glass flux increases, and the surface of the light emitting part may become rough. Therefore, there is a possibility that dirt is likely to adhere to the light emitting part.

On the other hand, when the content of Al ₂ O ₃ is less than 0.1% by weight, the coefficient of thermal expansion is high, and cracks are likely to occur in the light emitting part. On the other hand, when it exceeds 7% by weight, the surface of the light emitting part becomes rough, and there is a possibility that dirt easily adheres to the light emitting part.
When the content of B ₂ O ₃ is less than 23 wt%, there is a possibility that acid resistance is deteriorated. On the other hand, if it exceeds 30% by weight, the alkali resistance may be deteriorated.

Moreover, when the content of Li ₂ O is less than 0.1% by weight, the thermal expansion coefficient of the glass flux is increased, and there is a risk that the light emitting part may crack or the light emitting part may be peeled off. There is. On the other hand, if it exceeds 3% by weight, the alkali resistance may be deteriorated.
Further, when the content of Na ₂ O is less than 1% by weight, the viscous flow of the glass flux becomes high, so that the surface of the light emitting part becomes rough and dirt may be easily attached. On the other hand, when it exceeds 5% by weight, the thermal expansion coefficient of the glass flux may be remarkably increased and the alkali resistance may be deteriorated.

The glass flux may further contain 4% by weight or less of K ₂ O, 5% by weight or less of TiO ₂ and 5% by weight or less of ZrO ₂ as optional components. These optional components can be contained alone or in combination.
In this case, alkali resistance can be improved.
When the K ₂ O content in the glass flux exceeds 4% by weight, the TiO ₂ content exceeds 5% by weight, or the ZrO ₂ content exceeds 5% by weight, the glass Since the viscous flow of the flux becomes high, the surface of the light emitting part becomes rough, and there is a possibility that dirt is likely to adhere.

  Examples of the organic binder include silicon resins, acrylic resins, alkyd resins, butyl resins, ethyl cellulose resins, nitrocellulose resins, and methyl cellulose resins. These can be used alone, but can also be used in combination.

  The light emitting part can be formed by applying the light emitting paste material to the glass substrate by, for example, a screen printing method, a roll coat printing method, a spray method or the like as described above, drying, and then firing. The firing temperature at this time is preferably 250 ° C. to 900 ° C.

The glass substrate is preferably made of lead-free crystallized glass. In this case, since harmful lead is not included, safety to the human body and the environment can be improved.
Further, as the glass substrate, the thermal expansion coefficient of preferably from ^{-5 × 10 -7 / K~60 × 10} -7 / K. As such a glass substrate, for example, a substrate made of low expansion crystallized glass, quartz glass or the like can be used. In this case, the light emitting display panel is excellent in heat resistance and thermal shock resistance.

When the average linear thermal expansion coefficient of the glass substrate is less than −5 × 10 ⁻⁷ / K, there is a risk that the light emitting part may be peeled off from the glass substrate during heating without matching with the thermal expansion coefficient of the light emitting part. is there. On the other hand, when it exceeds 60 × 10 ⁻⁷ / K, there is a risk of destruction due to thermal shock.
The glass substrate may be colored. Examples of such a glass substrate include those in which the light emitting surface on which the light emitting portion is formed, for example, is colored, or the glass substrate itself is colored.

The glass substrate preferably has a solar transmittance of 0.5% or more.
When the solar transmittance of the glass substrate is less than 0.5%, it may be difficult to visually recognize the light emitted from the light emitting unit from the use surface side that is the surface facing the light emitting surface.
The solar radiation transmittance can be measured by a method prescribed in JIS R3106.

The crystallized glass is preferably made of Li ₂ O—Al ₂ O ₃ —SiO ₂ glass.
In this case, since the glass substrate does not easily expand even at a high temperature and has a low expansion, the heat resistance of the light-emitting display panel can be improved. In this case, the solar radiation transmittance of the glass substrate can be 0.5% or more, and the glass substrate transmits light having a wavelength of 340 nm or more and blocks light having a wavelength of less than 340 nm. The transmission characteristics can be shown. Therefore, in this case, the glass substrate itself can block light having a wavelength of 300 nm or less, which is said to be harmful to the human body, and it is not necessary to form a separate UV-cutting film.
In particular, in this case, the light-emitting display board can be used as a top plate for a cooking device to be placed on top of a heating cooker incorporating heating means and ultraviolet ray generation means, thereby blocking light of the above-mentioned specific wavelength. The effect can be exhibited remarkably.

Next, it is preferable that a light shielding layer containing a concealing agent is formed between the glass substrate and the light emitting portion.
In this case, the light-emitting display panel can exhibit concealment. Therefore, internal structures, such as a heating apparatus of a heating cooker, can be concealed using the said light emission display board.
More specifically, when the light-emitting display plate is used as a top plate for a cooking device, the internal structures such as heating means and ultraviolet ray generating means built in the cooking device can be concealed by the light-emitting display plate.

Further, as described above, when the light shielding layer is formed between the glass substrate and the light emitting portion, the solar transmittance (JIS R3106) of the light shielding layer is 0.5% to 5%. It is preferable.
When the solar transmittance of the light shielding layer is less than 0.5%, it is difficult to visually recognize the light emitted from the light emitting portion from the use surface side that is the surface facing the light emitting surface of the light emitting display plate. There is a fear. On the other hand, if it exceeds 5%, the concealing effect by the light shielding layer may not be sufficiently exhibited.

The light shielding layer can be formed by applying a light shielding paste material containing a concealing agent and an organic binder to the glass substrate and baking it. By adjusting the amount of the concealing agent, the thickness of the light shielding layer, and the like, the concealing property of the light shielding layer can be appropriately adjusted.
Examples of the concealing agent include titanium oxide, zirconium oxide, and zirconium silicate. Moreover, as an organic binder used for the said light shielding paste material, the organic binder similar to the said light emitting paste material for forming the said light emission part can be used. Moreover, as said light-shielding paste material, what contains glass flux other than the said light-shielding agent and the said organic binder can be used. In this case, the adhesion between the light shielding layer and the glass substrate or the light emitting part can be improved. As the glass flux used for the light shielding paste material, the same glass flux used for the light emitting paste material can be used.
Further, the light shielding layer can be formed using, for example, a raster described in JP-A-3-65532 as the light shielding paste material.
The above raster is a dilute solution of an organometallic compound, a noble metal element such as gold, silver, platinum, palladium and a base metal such as bismuth, iron, cobalt, titanium, tin, chromium, nickel, silica, magnesium, calcium, lead It is a combination of elements, and an inorganic coating light-shielding layer can be formed by baking on a glass substrate.

Further, the glass substrate is provided with a light shielding layer containing a concealing agent, the light emitting display panel has a slit portion in which the light shielding layer is not partially formed, and the light emitting portion is the slit. Preferably, it is formed in the portion (claim 7).
In this case, when the light emitting unit is caused to emit light by ultraviolet light and the emitted light is observed from a surface (use surface) opposite to the light emitting surface on which the light emitting unit is formed, the light emitted from the light emitting unit is blocked by the light shielding. Unhindered by layers. Therefore, the light emitting part can emit light clearly.

  In addition, a decorative layer containing a color pigment can be formed on the use surface opposite to the light emitting surface of the light emitting display panel. In this case, the design of the light emitting display panel can be improved. In addition, the decorative layer can display character information such as precautions for the user of the cooking device on the surface of the light emitting display board.

The decorative layer can be formed by applying a decorative paste material containing a glass flux, a color pigment, an organic binder and the like to the glass substrate in a desired shape.
As said glass flux and said organic binder, the thing similar to the said paste material for light emission for forming the said light emission part can be used.
Moreover, as the colored pigment, for example, the following materials can be used depending on the type of color.

  That is, for black, Cr—Fe, Co—Mn—Cr—Fe, Co—Ni—Cr—Fe, Co—Ni—Cr—Fe—Mn, etc., for gray, Sn—Sb, Sn—Sb— V for yellow, Sn-V, Zr-V, Zr-Si-Pr, Ti-Cr-Sb, Zr-Si-Cd-S, CdS, etc. for yellow, Zn-Al-Cr-Fe for brown, Zn-Mn-Al-Cr-Fe, etc. for green, Ca-Cr-Si, Cr-Al, Co-Zn-Al-Cr, Zr-Si-Pr-V, etc., for blue, Co-Al- Zn, Co-Al, Co-Si, Zr-Si-V, etc. for pink, Mn-Al, Ca-Sn-Si-Cr, Sn-Cr, Zr-Si-Fe, etc. for red, Zr for red -Si-Cd-Se-S, Cd-Se-S, or the like can be used. These can be mixed and used in an arbitrary ratio so as to obtain a desired color.

Further, on the light emitting surface side of the light emitting display plate, between the light emitting portion and the glass substrate, or between the light shielding layer and the glass substrate when the light shielding layer is formed, A base decorative layer containing a color pigment can be formed.
In this case, a desired color or pattern can be formed on the light-emitting display board, and the design of the light-emitting display board can be improved.

The solar light transmittance (JIS R3106) of the base decorative layer is preferably 0.5% or more.
When the solar transmittance of the base decorative layer is less than 0.5%, it is difficult to visually recognize the light emitted from the light emitting unit from the use surface side that is the surface facing the light emitting surface of the light emitting display panel. There is a risk.

The base decoration layer can be formed by applying and baking a base decoration paste material containing a pearly material as a color pigment and an organic binder on the light emitting surface side of the glass substrate.
As the pearl tone material, for example, a material formed by coating an inorganic pigment such as kaolin, talc, sericite, pyroferrite, natural mica, synthetic mica, aluminum oxide with titanium oxide, zirconium oxide, or iron oxide, etc. Can do. Moreover, as the organic binder of the base decoration paste material, the same material as the light emitting paste material can be used.

  Moreover, as said base decoration paste material, the thing containing glass flux other than the said pearl tone material and the said organic binder can be used. In this case, the adhesion between the glass substrate, the light emitting unit, the light shielding layer, and the like and the base decoration layer can be improved. As the glass flux used for the base decoration paste material, the same glass flux as that used for the light emitting paste material can be used.

It is preferable that the light emitting display plate is a top plate for a cooking device disposed on the upper portion of the cooking device.
In this case, in the heating cooker, the light emitting display plate (top plate) can display the heating state of the heating cooker or the like to the user by the light emission of the light emitting unit. And the user can recognize easily the heating state of a heating cooker, etc. by seeing the surface of the top plate which is a use surface of a heating cooker.

In this case, the light emitting surface on which the light emitting portion is formed in the light emitting display panel is directed to the cooking device side, and the use surface side opposite to the light emitting surface is directed to the user side of the cooking device. In addition, it is preferable to dispose the light emitting display plate on the upper portion of the cooking device.
In this case, for example, an ultraviolet ray generating means or the like can be incorporated in the cooking device so that the light emitting unit can emit light from the light emitting surface side. The light emission of the light emitting part can be easily visually recognized. In this case, as described above, the glass substrate is made of Li ₂ O—Al ₂ O ₃ —SiO ₂ glass or the like, so that the ultraviolet rays from the ultraviolet ray generator built in the heating cooker are used. Of these, wavelengths harmful to the human body can be blocked.

Next, in the second invention, the cooking device has a heating means.
As such a heating cooker, an IH electromagnetic cooker using electromagnetic as a heating means, a gas cooker using a flame burner, a halogen cooker using a halogen heater, a radical heater cooker using a radial heater And a microwave oven using a microwave generator.

The cooking device has an ultraviolet ray generating means.
The ultraviolet ray generating means is a device that generates light having a wavelength in the ultraviolet region (wavelength of 100 to 400 nm) in the spectrum distribution.

Examples of the ultraviolet ray generating means include black light, chemical lamp, ultraviolet light emitting diode (LED), mercury fluorescent lamp, and xenon fluorescent lamp. The specific emission wavelengths of these ultraviolet ray generating means are 300 to 400 nm (peak wavelength around 350 nm) for black light, 300 to 450 nm (around peak wavelength 350 nm) for chemical lamps, and 350 to 400 nm (peak wavelength 370 nm) for ultraviolet light emitting diodes. Vicinity), and the xenon flash lamp is 200 to 2000 nm (peak wavelength is around 450 nm).
In addition, a low-pressure mercury lamp that generates light having a specific peak wavelength can be used as the ultraviolet ray generating means, such as a low-pressure mercury lamp for a peak wavelength of 185.254 nm.

Preferably, the ultraviolet ray generating means is an ultraviolet light emitting diode.
In this case, the power consumption can be reduced and the environmental load can be reduced.

Example 1
Next, the Example of the light emission display board and heating cooker of this invention is described using FIGS. 1-4.
As shown in FIGS. 1-3, the light emission display board 1 of this example is used in order to represent the heating state of a heating cooker. The light-emitting display panel 1 has a glass substrate 10 made of crystallized glass and a light-emitting portion 4 formed on at least a part thereof. The light emitting unit 4 contains a fluorescent pigment that emits light by ultraviolet rays. The light-emitting display board 1 of this example is a top plate for a cooking device to be placed on the top of the electromagnetic cooking device.

  Moreover, in the light emitting display panel 1 of this example, as shown in FIG. 3, the decorative layer 5 containing a color pigment is provided on the use surface 11 of the glass substrate 10 opposite to the light emitting surface 12 that forms the light emitting portion 4. Is formed. As shown in FIGS. 1-3, the decoration layer 5 forms the circular-shaped positioning mark for showing the position which mounts cooking utensils, such as a pan.

Moreover, as shown in FIG. 3, the base decoration layer 2 containing a metallic material is formed on the light emitting surface 12 side of the glass substrate 10. In addition, a light shielding layer 3 is laminated on the base decoration layer 2.
As shown in the figure, the light emitting display panel 1 is provided with a slit portion 35 in which the light shielding layer 3 is not partially formed. The slit portion 35 is formed in a circular shape having a slightly larger diameter than the circular positioning mark formed by the decorative layer 5 formed on the use surface 11 side. Further, in the light emitting display panel 1, in addition to the circular slit 35 part, a slit part 35 for forming the word “caution” is formed.
The light emitting part 4 is formed in the slit part 35, and the light emitting part 4 is formed in a circular shape and the letters “caution” (see FIGS. 1 and 2).

As shown in FIG. 4, the heating cooker 6 of this example includes heating means 62 and 63, ultraviolet light emitting means 64, and the light emitting display plate 1. In the heating cooker 6, the light emitting display plate 1 is arranged with the light emitting surface 12 side on which the light emitting unit 4 is formed facing the ultraviolet ray generating means 64 side. The ultraviolet ray generating means 64 is configured to irradiate the light emitting part on the light emitting surface 12 side of the light emitting display panel 1 with ultraviolet rays in relation to the heating operation of the heating means 62 and 63.
In this example, the heating cooker 6 includes a heating device 62 using an induced current and a radial heater 63 as the heating means 62 and 63.

Next, a manufacturing method of the light emitting display panel 1 of this example will be described.
First, a glass substrate 10 made of Li ₂ O—Al ₂ O ₃ —SiO ₂ glass was prepared. This glass substrate 10 is a low expansion crystallized glass substrate having a thermal expansion coefficient of −0.2 × 10 ⁻⁷ / K and a solar transmittance of 94%.
Next, 85 parts by weight of a glass flux, 15 parts by weight of a color pigment, and 100 parts by weight of an organic binder were mixed to produce a decorative paste material for forming the decorative layer 5. The glass flux, 65 parts by weight of SiO _2, Al ₂ O ₃ to 4 parts by weight, B ₂ O ₃ to 24 parts by weight, 1 part by weight of Li ₂ O, and Na ₂ O and 2 parts by weight, K ₂ O 2 parts by weight, TiO ₂ 1 part by weight, and ZrO ₂ 1 part by weight were used. An acrylic resin was used as the organic binder, and a black pigment was used as the coloring pigment.
This decorative paste material was applied to the glass substrate 10 in a circular shape by screen printing, dried, and then baked at a temperature of 800 ° C. for 10 minutes. As a result, the decorative paste material was baked onto the use surface 11 of the glass substrate 10 to form the decorative layer 5. Screen printing was performed using a 350 mesh screen.

Next, 100 parts by weight of the pearl tone material and 900 parts by weight of the organic binder were mixed to prepare a base decoration paste material. An iron oxide-coated mica pigment formed by coating mica with iron oxide was used as the pearl tone material, and an acrylic resin and a silicone resin were used as the organic binder.
This base decoration paste material was applied to almost the entire light emitting surface 12 of the glass substrate 10 by screen printing using a 250 mesh screen, dried, and then baked at a temperature of 800 ° C. for 10 minutes. As a result, the base decoration paste material was baked onto the light emitting surface 12 of the glass substrate 10 to form the base decoration layer 2. The light emitting surface 12 is a surface opposite to the surface (use surface 11) on which the decorative paste material is applied on the glass substrate.

Next, a raster was prepared as a light-shielding paste material, and this raster was applied by screen printing using a 400-mesh screen so as to overlap the base decoration layer 2 baked on the light emitting surface 12 side of the glass substrate 10. . Moreover, the slit part 35 in which the light-shielding paste material (raster) was not printed was formed in screen printing.
The slit portion 35 has a circular shape and has a circle center at substantially the same position as the decorative layer 5 (circular shape). The slit portion 35 is formed with a larger diameter than the decorative layer 5. In screen printing, apart from the circular slit portion 35, a slit portion 35 indicating the word “caution” was formed (see FIGS. 1 and 2).
After the screen printing, the printed light shielding paste material was dried and then baked at a temperature of 800 ° C. for 5 minutes. Thus, the light shielding paste material was baked to form the light shielding layer 3.

Next, 95 parts by weight of a fluorescent pigment, 5 parts by weight of a phosphorescent pigment, and 300 parts by weight of an organic binder were mixed to produce a light emitting paste material for forming the light emitting part 4. A red pigment was used as the fluorescent pigment and the phosphorescent pigment, and a silicon resin was used as the organic binder.
This light emitting paste material was applied to the slit portion 35 and dried. The light emitting paste material was applied by screen printing using a 250 mesh screen.

Next, the glass substrate 10 coated with the light emitting paste material was baked at a temperature of 400 ° C. for 10 minutes. Thereby, the light emitting paste material was baked to form the light emitting portion 4 (see FIGS. 1 to 3). In this way, as shown in FIGS. 1 to 3, the light emitting display panel 1 in which the base decorative layer 2, the light shielding layer 3, the light emitting portion 4, and the decorative layer 5 were formed on the glass substrate 10 was obtained.
In the light-emitting display panel 1 of this example, the solar transmittances of the light shielding layer 3 and the base decoration layer 2 were measured according to the method prescribed in JIS R3106, and the combined transmittance of the light shielding layer 3 and the base decoration layer 2 (light shielding layer). And the transmittance of the laminate of the base decorative layer was 0.4%, and the transmittance of the base decorative layer 2 was 3%.

Next, the heating cooker 6 is produced using the said light emission display board 1 (refer FIG. 4).
Specifically, first, an IH heating device 62 and a radiant heater 63 were arranged as heating means in the cooker case 61. In this example, two IH heating devices 62 and one radiant heater 63 are arranged.
Next, an ultraviolet light emitting diode as the ultraviolet ray generating means 64 was disposed around the heating means 62 and 63. The ultraviolet ray generating means 64 operates in conjunction with the energization of the heating means 62 and 63 to generate ultraviolet rays.

  The light emitting display panel 1 produced as described above was placed in the opening at the top of the cooker case 61. At this time, the light-emitting display board 1 was disposed so that the light-emitting surface 12 of the light-emitting display board 1 was on the cooking device side (lower side) and the use surface 11 was on the upper side. In this way, a heating cooker 6 was produced.

Next, the effect of the light emission display board and heating cooker of this example is demonstrated.
As shown in FIGS. 1-4, in the light emission display board 1 of this example, the light emission part 4 containing a fluorescent pigment is formed in the light emission surface 12 side on the opposite side to the use surface 11 of the glass substrate 10. As shown in FIG. . Therefore, in the cooking device 6, when the light emitting unit 4 of the light emitting display plate 1 is irradiated with ultraviolet rays from the ultraviolet ray generating means 64, the light emitting unit 4 emits light.
Moreover, in the heating cooker 6 of this example, the ultraviolet-ray generation means 64 is comprised so that an ultraviolet-ray may be irradiated according to the heating operation of the heating means 62 and 63. FIG. Therefore, the user of the heating cooker 6 can easily recognize the heating operation of the heating means by the light emission of the light emitting part of the light emitting display panel 1.

  Moreover, in this example, the light emission part 4 is exhibiting white before ultraviolet irradiation, and is hard to visually recognize from the use surface 11 side (refer FIG. 1). When the light emitting unit 4 was irradiated with ultraviolet rays from the ultraviolet ray generator 64, the light emitting unit 4 emitted red light (see FIG. 2). In particular, in the light-emitting display panel 1 of the present example, not only the light-emitting portion 4 formed in a circular shape around the decorative layer 5 but also the light-emitting portion 4 formed in a letter shape of “caution” emitted red light. Therefore, the user of the cooking device 6 can easily visually recognize the heating operation of the cooking device.

Further, in the heating cooker 6 of the present embodiment, a glass substrate 10 of the light-emitting display panel 1 is composed of _{Li 2 O-Al 2 O 3} -SiO 2 based glass. Therefore, the glass substrate 10 can block light having a wavelength of 300 nm or less, which is harmful to the human body, among ultraviolet rays from the ultraviolet ray generating means 64. Therefore, even if the user of the cooking device 6 sees the light emitting display board from the use surface 11 side, it is hardly affected by the ultraviolet rays generated from the inside.

Further, in the light emitting display panel 1 of this example, the base decoration layer 2 is formed on the light emitting surface 12 side (see FIG. 3). Therefore, when observing from the use surface 11 side, the golden base decoration layer 2 can be seen through. For this reason, the light-emitting display panel 1 of this example has a high-class feeling and is excellent in design.
In this example, the light-emitting portion is formed using a red fluorescent pigment and a phosphorescent pigment. However, it has been confirmed that similar results can be obtained using a blue or other color.

  As described above, according to this example, it is possible to provide a light-emitting display board and a heating cooker that can easily form complicated characters and patterns and that allows a user to easily identify light emission.

(Example 2)
In this example, a light-emitting display panel having a structure different from that of Example 1 is manufactured.
As shown in FIGS. 5 and 6, the light-emitting display plate 7 of this example includes a glass substrate 70 made of crystallized glass and a light-emitting portion 73 formed on at least a part thereof. The light emitting unit 73 contains a fluorescent pigment that emits light by ultraviolet rays. The light-emitting display board 7 of this example is a top plate for a cooker to be placed on the top of the electromagnetic cooker, as in the first embodiment.

  As shown in FIG. 6, a decorative layer 71 containing a color pigment is formed on the use surface 701 of the glass substrate 70 opposite to the light emitting surface 702 that forms the light emitting portion 73, as in the first embodiment. As shown in FIGS. 5 and 6, the decorative layer 71 forms a circular positioning mark for indicating the placement position of a cooking utensil such as a pan as in the first embodiment.

Further, a light shielding layer 72 is formed between the glass substrate 70 and the light emitting unit 73. That is, the light emitting unit 73 is laminated on the light shielding layer 72 on the light emitting surface 702 side of the glass substrate 70.
As in the first embodiment, the light emitting portion 73 has a circular shape with a slightly larger diameter than the circular positioning mark formed by the decorative layer 71 formed on the use surface 701 side. In addition to the circular light emitting portion 73, the light emitting display board 7 is formed with a light emitting portion 73 that forms the letters “caution” as in the first embodiment (see FIG. 5).

In manufacturing the light emitting display board 7 of this example, first, the same glass substrate 70 and decorative paste material as those of Example 1 were prepared. In the same manner as in Example 1, this decorative paste material was applied to the glass substrate 70 in a circular shape by 350 mesh screen printing, dried, and then baked at a temperature of 800 ° C. for 10 minutes to form a decorative layer 71.
Next, a raster is prepared as a light-shielding paste material, and this raster is applied to almost the entire surface of the glass substrate 70 on the light emitting surface 702 side by screen printing using a 350 mesh screen, dried, and then at a temperature of 800 ° C. Baked for 5 minutes. Thus, the light shielding paste material (raster) was baked to form the light shielding layer 72.

  Subsequently, the light emitting paste material similar to Example 1 was prepared. This light emitting paste material was applied in the same shape as in Example 1 on the light shielding layer 72 baked on the light emitting surface 702 side of the glass substrate 70 and dried. The light emitting paste material was applied by screen printing using a 250 mesh screen.

Next, the glass substrate 70 coated with the light emitting paste material was baked at a temperature of 300 ° C. for 10 minutes. Thereby, the light emitting paste material was baked to form the light emitting portion 73. In this way, as shown in FIGS. 5 and 6, the light emitting display plate 7 in which the decoration layer 71, the light shielding layer 72, and the light emitting portion 73 were formed on the glass substrate 70 was obtained.
In the light-emitting display panel 7 of this example, the solar transmittance of the light shielding layer was measured according to the method prescribed in JIS R3106, and the transmittance of the light shielding layer was 5%.

In the light-emitting display panel 7 of this example, unlike the first embodiment, the light-emitting portion 73 is laminated on the surface of the light shielding layer 72. Also in this case, similarly to Example 1, when the light emitting unit 73 was irradiated with ultraviolet rays to emit light, the light emitted from the light emitting unit 73 could be easily visually recognized from the use surface 701 side.
Unlike the first embodiment, the light-emitting display panel 7 of this example does not have a base decorative layer. Therefore, when viewed from the use surface 701 side, the light shielding layer (black) 72 can be seen through. Moreover, when this light emission display board 7 is arrange | positioned on an electromagnetic cooker etc. and used as a top plate, the light shielding layer 72 can conceal the internal apparatus of an electromagnetic cooker.

(Example 3)
This example is an example of a light emitting display panel in which a light emitting portion is formed so as to be in direct contact with a glass substrate.
As shown in FIGS. 7 and 8, the light emitting display panel 8 of this example includes a glass substrate 80 made of crystallized glass and a light emitting portion 83 containing a fluorescent pigment that emits light by ultraviolet rays. The light emitting unit 83 is formed so as to cover one surface (light emitting surface) 802 of the glass substrate 80. A decorative layer 81 is formed on the use surface 801 opposite to the light emitting surface 802. In this example, the decorative layer 81 forms a white character “CAUTION”.

In manufacturing the light emitting display panel 8 of this example, first, a glass substrate 80 similar to that of Example 1 was prepared. Next, 80 parts by weight of a glass flux, 20 parts by weight of a color pigment, and 150 parts by weight of an organic binder were mixed to produce a decorative paste material for forming the decorative layer 81. A gray pigment was used as the color pigment, and the same glass flux and organic binder as those in Example 1 were used.
This decorative paste material was applied to the glass substrate 80 by screen printing using a 300-mesh screen to form the word “caution” and dried.

Next, 40 parts by weight of a fluorescent pigment, 10 parts by weight of a phosphorescent pigment, 50 parts by weight of glass flux, and 80 parts by weight of an organic binder were mixed to produce a light emitting paste material for forming the light emitting part 83. A red pigment was used as the fluorescent pigment and the phosphorescent pigment, and an acrylic resin was used as the organic binder. Further, the same glass flux as that of the decorative paste material of Example 1 was used.
This light emitting paste material was applied to the light emitting surface 802 side opposite to the use surface 801 on which the decorative paste material was applied on the glass substrate 80 and dried. The application was performed by screen printing using a 250 mesh screen, and the light emitting paste material was applied so as to cover almost the entire surface of the glass substrate 80 on the light emitting surface 802 side.

  Next, the glass substrate 80 coated with various paste materials as described above was baked at a temperature of 830 ° C. for 10 minutes. Thus, the decorative paste material was baked on the glass substrate to form the decorative layer 81, and the luminescent paste material was baked to form the light emitting portion 83. In this way, as shown in FIGS. 7 and 8, the light emitting display panel 8 was obtained.

In the light-emitting display panel 8 of this example, the light-emitting portion 83 is white before ultraviolet irradiation. For this reason, before ultraviolet irradiation, the gray letters “caution” (decoration layer 81) formed on the use surface 801 side of the glass substrate 80 are difficult to identify when viewed from the use surface 801 side. .
When the light emitting unit 83 is irradiated with ultraviolet rays, the light emitting unit 83 emits red light. As a result, the gray word “caution” (decoration layer 81) formed on the use surface 801 side is emphasized against the red color of the light emitting unit 83.

  Therefore, for example, when the light-emitting display plate 8 of this example is used as a glass plate of an opening / closing door in a microwave oven or the like, and the light-emitting portion 83 of the light-emitting display plate 8 is caused to emit light by an internal ultraviolet ray generating means during operation of the microwave oven, During the operation, the character “CAUTION” on the decorative layer 83 is highlighted. As a result, the user can be alerted during operation of the microwave oven.

The top view which shows the mode from the use surface side of the light emission display board concerning Example 1 before ultraviolet irradiation. The top view which shows the mode from the use surface side of the light emission display board in Example 1 during ultraviolet irradiation. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. Sectional explanatory drawing which shows the structure of the heating cooker concerning Example 1. FIG. FIG. 6 is a top view showing a state from the use surface side of the light emitting display plate according to the second embodiment. FIG. 6 is a cross-sectional view taken along line B-B in FIG. 5. FIG. 10 is a top view showing a state from the use surface side of the light emitting display plate according to the third embodiment. FIG. 8 is a cross-sectional view taken along line CC in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emission display board 10 Glass substrate 2 Base decoration layer 3 Light-shielding layer 4 Light emission part 5 Decoration layer 6 Heating cooker 62 Heating means 63 Heating means 64 Ultraviolet ray generation means

Claims (10)

A light-emitting display board used to represent the heating state of the cooking device,
The light-emitting display panel has a glass substrate made of crystallized glass, and a light-emitting portion formed on at least a part of the glass substrate,
The light emitting display plate, wherein the light emitting portion contains a fluorescent pigment that emits light by ultraviolet rays.   2. The light-emitting display panel according to claim 1, wherein the light-emitting portion contains a phosphorescent pigment.   In Claim 1 or 2, the said light emission part is the organic binder 50 with respect to the total amount 100 weight part of 20-100 weight part of total amounts of the said fluorescent pigment and the said luminous pigment, and 0-80 weight part of glass fluxes. A light-emitting display panel, which is obtained by applying a paste material for light-emitting obtained by mixing ˜300 parts by weight to the glass substrate and baking it.   4. The light-emitting display panel according to claim 1, wherein the glass substrate has a solar transmittance of 0.5% or more. 5. The light-emitting display panel according to claim 1, wherein the crystallized glass is made of Li ₂ O—Al ₂ O ₃ —SiO ₂ -based glass.   The light-emitting display panel according to claim 1, wherein a light-shielding layer containing a concealing agent is formed between the glass substrate and the light-emitting portion.   6. The slit portion in which the light-shielding layer containing a concealing agent is formed on the glass substrate according to claim 1, and the light-emitting display panel is not partially formed with the light-shielding layer. A light-emitting display panel, wherein the light-emitting portion is formed in the slit portion.   The light-emitting display board according to claim 1, wherein the light-emitting display board is a top plate for a cooker disposed on an upper part of the cooking device. A cooking device having a heating means, an ultraviolet light emitting means, and a light emitting display board,
As the light-emitting display board, the light-emitting display board according to any one of claims 1 to 8 is adopted,
The light emitting display plate is arranged with the light emitting surface side on which the light emitting part is formed facing the ultraviolet ray generating means side,
The heating cooker, wherein the ultraviolet ray generating means is configured to irradiate the light emitting portion of the light emitting display plate with ultraviolet rays in association with a heating operation of the heating means.   The cooking device according to claim 9, wherein the ultraviolet ray generating means is an ultraviolet light emitting diode.

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