JP5133024B2 - LAMINATE MANUFACTURING METHOD, STEEL HEATER, AND LED LIGHT EMITTER - Google Patents

Description

  The present invention relates to a laminate manufacturing method, a steel heater using the laminate, and an LED (light emitting diode) emitter. More specifically, the present invention is a laminate comprising a stainless steel sheet and a glass layer formed on one surface thereof, and warpage is sufficiently suppressed or prevented and a laminate having high heat resistance is produced. Regarding the method. Moreover, it is related with the steel heater provided with this laminated body, and LED light-emitting body.

  Conventionally, a steel heater including a stainless steel substrate, an insulating layer disposed thereon, a heater wire including a terminal disposed thereon and a plurality of parallel wires connecting the terminals is known ( For example, see Patent Document 1.) This steel heater is useful for heating and drying a flat panel display having a large area such as a liquid crystal panel, and can uniformly heat and dry the entire surface of the flat panel display. However, in this steel heater, the laminated substrate may warp due to the difference in thermal expansion between stainless steel and glass when the insulating layer is formed. When the laminated substrate is warped as described above, it may be difficult to handle in the operation of arranging the heater wires, and the entire surface of the flat panel display or the like may not be heated and dried uniformly.

  As a method of suppressing such warpage, when joining a ceramic substrate and a metal substrate by heat treatment through a bonding material, the metal substrate is deformed in advance in the direction opposite to the deformation due to the difference in thermal expansion coefficient between the ceramic and the metal. An application method has been proposed (see, for example, Patent Document 2). Further, it is described that the design of the heat radiating substrate on which the semiconductor device is mounted becomes easy because the metal substrate is horizontal.

JP 2004-220782 A JP-A-1-243564

  However, the above-mentioned method for preventing warpage by applying deformation processing to the metal substrate in the opposite direction to the deformation due to the difference in thermal expansion coefficient between ceramic and metal is applied to the suppression of warpage of the laminate in the present invention, Even if the stainless steel sheet is previously deformed in the opposite direction to warpage to produce a laminate, the warpage cannot be sufficiently suppressed, and it is necessary to suppress or prevent warpage by other methods.

  The present invention has been made in view of the above-described conventional situation, and is a laminate including a stainless steel sheet and a glass layer formed on one surface thereof, and warpage is sufficiently suppressed or prevented, And it aims at providing the manufacturing method of a laminated body with high heat resistance. It is another object of the present invention to provide a steel heater and an LED light-emitting body including a laminate that has extremely low warpage or no warpage and high heat resistance.

The glass powder supplied to the surface of the stainless steel sheet is usually fired using a heating furnace such as a tunnel furnace. In this case, the stainless steel sheet supplied with the glass powder is placed on a rotating support such as a mesh belt, and the glass is fired by transporting the inside of the furnace. It may warp upward. For this reason, in consideration of this warpage in advance, only the both ends in the long dimension direction of the stainless steel sheet were supported and fired. However, in this method, the laminate warps downward, and a sufficiently smooth laminate cannot be obtained. Therefore, when the first glass layer is formed, the stainless steel sheet is brought into contact with the support as in the conventional manner, and in the formation of the second and subsequent glass layers, both end sides in the longitudinal direction of the stainless steel sheet. As a result, it was possible to obtain a sufficiently smooth laminate.
The present invention has been made based on such knowledge.

The present invention is as follows.
1. A method for producing a laminate having a long stainless steel sheet and two or more glass layers provided on one surface side of the stainless steel sheet, and forming a green glass layer on one surface of the stainless steel sheet Thereafter, the unsintered glass layer is fired in a state where the other surface of the stainless steel sheet is in contact with a flat support to form a first glass layer, and then a glass layer higher than the first glass layer. It is a manufacturing method of a laminate in which a layer is formed by firing an unfired glass layer formed on the surface of a lower glass layer, and the intermediate laminate having the stainless steel sheet and the lower glass layer is the lower layer. When the glass layer side of the stainless steel sheet is warped so as to be convex, both end sides in the longitudinal direction of the other surface of the stainless steel sheet are supported by end support members on the lower glass layer. Sequentially the upper glass layer When the intermediate laminate is not warped so that the lower glass layer side is convex in a state where the other surface of the stainless steel sheet is in contact with a flat support, A method for producing a laminate, comprising forming an upper glass layer on the lower glass layer.
2. A straight line connecting both ends in the long dimension direction on the other surface of the stainless steel sheet with respect to the length [La (mm)] in the long dimension direction of the stainless steel sheet when the intermediate laminate warps, The ratio (Ls / La) of the shortest dimension [Ls] between the top portion of the other surface of the stainless steel sheet formed into a shape is 0.005 or more. The manufacturing method of the laminated body as described in any one of.
3. When the firing temperature is 750 to 950 ° C., and the intermediate laminate is warped, the first glass layer is the second glass layer, which is the second glass layer. Or 2. The manufacturing method of the laminated body as described in any one of.
4). When the firing temperature is 450 to 650 ° C. and the intermediate laminate is warped, the first glass layer, which is the first glass layer, is formed. Or 2. The manufacturing method of the laminated body as described in any one of.
5. 1. The glass layer has 4 to 6 layers. To 4. The manufacturing method of the laminated body of any one of these.
6). 1. The stainless steel sheet having a thickness of 0.2 to 1.5 mm. To 5. The manufacturing method of the laminated body of any one of these.
7). The stainless steel sheet is heated in advance at 500 to 950 ° C. for 5 to 15 minutes, and then cooled and used. To 6. The manufacturing method of the laminated body of any one of these.
8). 1. The ratio (L / h) between the dimension (L) between the both ends of the stainless steel sheet and the height (h) of the end support is 10-60. To 7. The manufacturing method of the laminated body of any one of these.
9. A circuit pattern is formed on the surface of at least one of the glass layers above the first glass layer. To 8. The manufacturing method of the laminated body of any one of these.
10. 8. A protective glass layer is formed on the exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed and on the surface of each circuit pattern. The manufacturing method of the laminated body as described in any one of.
11. 10. above. It is a steel heater provided with the laminated body manufactured by the manufacturing method of the laminated body as described in above, Comprising: It is formed in the surface of the glass layer of at least 1 layer of the glass layers of the upper layer from the said 1st glass layer, and is a heat_generation | fever effect | action And the electrode terminal for supplying power to the circuit pattern, the exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed, and the surface of the circuit pattern. A steel heater comprising a protective glass layer.
12 10. above. An LED luminous body comprising a laminate produced by the method for producing a laminate as described in 1 above, wherein the circuit is formed on the surface of at least one of the glass layers above the first glass layer. A light emitting diode disposed in the laminate and connected to the circuit pattern; an exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed; and a surface of the circuit pattern And a protective glass layer formed thereon.

According to the method for producing a laminate of the present invention, the first glass layer is formed by firing in a state where the entire other surface (back surface) of the long stainless steel sheet is in contact with a flat support, When the intermediate laminated body having the stainless steel sheet and the lower glass layer is warped so that the lower glass layer side is convex, the upper glass layer above the glass layer is the other side of the stainless steel sheet. The upper glass layer is formed in a state where both ends in the long dimension direction are supported by the end support. Therefore, warpage of the laminate due to the difference in thermal expansion between stainless steel and glass can be sufficiently suppressed or prevented, and an extremely smooth laminate with little or no warpage can be produced. .
Further, when the intermediate laminate is warped, a straight line connecting both ends in the long dimension direction on the other surface of the stainless steel sheet with respect to the length [La (mm)] in the long dimension direction of the stainless steel sheet, and a convex shape When the ratio (Ls / La) of the shortest dimension [Ls] to the top of the other surface of the formed stainless steel sheet is 0.005 or more, the upper glass layer from the second layer is used as the first glass layer Although the warpage of the laminate cannot be suppressed by forming in the same manner as the above, by firing in a state where both ends in the long dimension direction of the other surface of the stainless steel sheet are supported by the end support, A very smooth laminate with little or no warpage can be produced.
Furthermore, the firing temperature is 750 to 950 ° C., and the intermediate laminate is warped when the second glass layer which is the second glass layer is formed, and the firing temperature is 450 to 650 ° C. When the intermediate laminated body is warped when the first glass layer, which is the first glass layer, is formed, a laminate with little or no warpage is correlated with the firing temperature. It can be manufactured easily and efficiently.
Moreover, when a glass layer is 4-6 layers, while a glass layer increases, a curvature is often suppressed more, and the laminated body with few curvature or a curvature can be manufactured.
Furthermore, when the thickness of the stainless steel sheet is 0.2 to 1.5 mm, the strength of the stainless steel sheet is small, and thus warpage is usually likely to occur due to a difference in thermal expansion. By baking by a process, the very smooth laminated body by which curvature was fully suppressed or prevented could be manufactured.
In addition, when the stainless steel sheet is heated in advance at 500 to 950 ° C. for 5 to 15 minutes and then cooled and used, it is possible to easily produce a laminate in which the occurrence of warpage is further suppressed or prevented. it can.
Furthermore, when the ratio (L / h) between the dimension (L) between the both ends of the stainless steel sheet and the height (h) of the end support is 10 to 60, the warp can be easily performed. And it can suppress more fully or can prevent it and can be set as a very smooth laminated body.
In addition, when a circuit pattern is formed on the surface of at least one of the glass layers above the first glass layer, a highly heat-resistant heater, light-emitting body, and the like can be easily manufactured. .
Furthermore, when a protective glass layer is formed on the exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed and on the surface of the circuit pattern, the circuit pattern is covered and protected by the protective glass layer. Therefore, it is possible to manufacture a heater, a light emitter and the like having high heat resistance and excellent durability.
It is preferable to set.

Since the steel heater of the present invention has no warpage and high heat resistance, the entire surface of a flat panel display or the like can be heated and dried uniformly and has excellent durability.
The LED illuminant of the present invention has no warpage and high heat resistance, so that when used as a liquid crystal backlight or the like, the entire surface of the liquid crystal screen can emit light uniformly and has excellent durability. .

Hereinafter, the present invention will be described in detail with reference to the drawings.
[1] Method for Producing Laminate The method for producing a laminate of the present invention is a method for producing a laminate having a stainless steel sheet and two or more glass layers provided on one surface thereof, and includes stainless steel. Forming an unsintered glass layer on one side of the sheet, and then firing the unsintered glass layer with the other side of the stainless steel sheet in contact with a flat support to form a first glass layer; When the intermediate layered body having the stainless steel sheet and the lower glass layer is warped so that the lower glass layer side has a convex shape, the glass layer on the upper layer than the one glass layer is formed on the other surface of the stainless steel sheet. It is characterized by firing and forming an unfired glass layer formed on the surface of the lower glass layer in a state where both ends in the long dimension direction are supported by the end support.

  The “intermediate laminate” means a laminate excluding a laminate in which all glass layers are formed. The “first glass layer” is formed by firing in a state where the other surface of the stainless steel sheet is in contact with a flat support. The glass layer above the first glass layer is an intermediate laminate. When the lower glass layer side is not warped so as to be convex, it can be fired and formed in the same manner as the first glass layer, while the intermediate laminate has the lower glass layer side After warping to be convex, it is formed by firing in a state where both ends in the long dimension direction of the other surface of the stainless steel sheet are supported by the end support.

  The degree of warpage when the intermediate laminate is warped so that the lower glass layer side is convex is not particularly limited, but the other surface of the stainless steel sheet with respect to the length [La (mm)] of the stainless steel sheet The ratio (Ls / La) of the shortest dimension [Ls] between the straight line connecting both ends in the length direction of the sheet and the top of the other surface of the convex stainless steel sheet is 0.005 or more (for example, La Is 400 mm, and when Ls / La is 2 mm or more), when the other surface of the stainless steel sheet is baked in contact with a flat support, warping is sufficiently suppressed, or warping Therefore, it is necessary to form a glass layer by firing in a state where both ends in the long dimension direction of the other surface of the stainless steel sheet are supported by the end support.

  The occurrence of warpage of the intermediate laminate depends on the composition of the glass contained in the unfired glass layer, the composition of the glass paste used to form the unfired glass layer, the firing temperature, and the like. Use a glass capable of forming a glass layer that is easy and has sufficient insulating properties. For example, (1) When the firing temperature is 750 to 950 ° C., the glass layer when the intermediate laminate warps Is the second glass layer of the second layer, (2) when the firing temperature is 450 to 650 ° C., the glass layer when the intermediate laminate warps is the first glass layer, It can be.

  The laminate may be a three-layer product having the stainless steel sheet 11, the first glass layer 12a, and the second glass layer 12b (see the diagram Bf in FIG. 3), and further on the surface of the second glass layer. At least one glass layer may be formed (see Cf in FIGS. 2 and 3). The second glass layer and the glass layer to be further formed can be formed in the same manner as the first glass layer when the intermediate laminate does not warp, and when the intermediate laminate warps, as described above. It can be formed using an end support. The total number of glass layers is not particularly limited, but is preferably 2 to 6 layers, particularly 4 to 6 layers, and more preferably 2 to 5 layers (see FIG. 2 having the third glass layer 12c and the fourth glass layer 12d). (See diagram D-f in FIG. 3). Thus, by sequentially forming a plurality of glass layers, the warpage of the laminate can be gradually reduced, and a laminate having no warpage can be obtained.

(1) Stainless Steel Sheet and Glass Layer The “stainless steel sheet” may be any stainless steel sheet and is not particularly limited. As the stainless steel, ferritic stainless steel having high heat resistance is preferable, and SUS430 and SUS444 are particularly preferable. The planar shape of the stainless steel sheet is not particularly limited, but may be a rectangle or an oval. Thus, even in the case of a stainless steel sheet having a long dimension in one direction, for example, a stainless steel sheet having a length of 1.3 to 30 times, particularly 5 to 20 times as long as the width, According to the manufacturing method, warpage in the length direction can be sufficiently suppressed, or warpage can be prevented. Further, the area of the stainless steel sheet is not particularly limited, and is preferably set according to the purpose and application.

  The thickness of the stainless steel sheet is not particularly limited, and can be 0.2 to 1.5 mm, particularly 0.2 to 1.0 mm, and further 0.3 to 0.8 mm. This thickness is preferably set according to the use of the laminate, for example, the structure of a light emitter such as a heater and LED light emitter, and the characteristics required for the heater and light emitter.

The “first glass layer” and the “glass layer above the first glass layer” may be formed using glass having any composition, but the difference in thermal expansion coefficient from the stainless steel sheet is considered. Then, glass, such as semi-crystalline glass, is preferable. The composition of the glass is not particularly limited, but a glass having a softening point of 350 ° C. or higher can be used, and a glass having a softening point of 400 ° C. or higher, particularly 500 ° C. or higher, and further 700 ° C. or higher (usually 760 ° C. or lower). It can also be used. Examples of such glass include SiO ₂ —Al ₂ O ₃ —RO glass (R is an alkaline earth metal element such as Mg, Ca, Ba, and Sr), Bi ₂ O ₃ glass, and the like. Can be mentioned.

(2) Formation of the first glass layer The first glass layer forms an unfired glass layer containing glass powder (see the first glass powder 121a in FIGS. 2 and 3, Aa) on one surface of the stainless steel sheet. Then, this unfired glass layer is fired and formed by cooling (see the first glass layer 12a in FIGS. 2, 3 and A-f). Although the formation method of an unbaked glass layer is not specifically limited, The glass paste containing glass powder can be apply | coated and formed on one surface of a stainless steel sheet. The method for preparing this glass paste is not particularly limited, but it can usually be prepared by mixing glass powder, a solvent, an organic binder and the like. The glass paste can be applied to one surface of the stainless steel sheet by screen printing or the like.

  The green glass layer is fired by heating in a state where the other surface of the stainless steel sheet is in contact with a flat support. Examples of the “support” include transport belts such as a mesh belt provided in a heating furnace such as a tunnel furnace used for heating (see FIGS. 2, Aa, Ba, and FIGS. 3, Aa). The mesh belt 2 may have irregularities or the like that are sufficiently smaller than the dimensions of the stainless steel sheet in the plane direction. The temperature and time of the “firing” are not particularly limited depending on the glass composition and the like, but the firing temperature can be 400 to 1000 ° C., and particularly 750 to 950 ° C. The firing time for maintaining this temperature can be 5 to 20 minutes, particularly 5 to 15 minutes, depending on the firing temperature. Furthermore, the firing atmosphere is not particularly limited, and may be any of an oxidizing atmosphere, an inert atmosphere, and the like, but firing can be performed in an air atmosphere that is an oxidizing atmosphere. In the case of an air atmosphere, the apparatus and operation are simple and advantageous in terms of cost, which is preferable.

The first glass layer is formed by firing and then cooling, but this cooling method is not particularly limited, and it is taken out from the heating furnace, cooled to room temperature (for example, 20 to 35 ° C.) and cooled. be able to. Moreover, it can also cool by lowering temperature at a predetermined speed using a cooling device.
The thickness of the first glass layer thus formed is not particularly limited, and can be 5 to 35 μm, particularly 10 to 30 μm.
In addition, although a stainless steel sheet may be used as it is, you may use it, after heat-processing beforehand. The temperature and time of this heat treatment are not particularly limited. For example, the heat treatment can be performed by heating at 500 to 950 ° C., particularly 750 to 950 ° C. for 5 to 15 minutes, and then cooling. By this heat treatment, the occurrence of warpage of the laminate can be further suppressed.

(3) Formation of the glass layer after the intermediate laminate is warped The formation of the glass layer after the intermediate laminate is warped is the glass powder (the lower glass layer is formed on the surface of the lower glass layer of this glass layer). FIG. 2 when it is the second glass layer, see the third glass powder 121c of C-a, and FIG. 3 when the lower glass layer is the first glass layer, see the second glass powder 121b of Ba). An unsintered glass layer is formed, and then the unsintered glass layer is fired and cooled to form a glass layer (third glass layer 12c in FIGS. 2 and Cf, and FIGS. 3 and Bf). Of the second glass layer 12b). The method for forming the unfired glass layer is not particularly limited, and is formed by applying a glass paste containing glass powder on the surface of the second glass layer (in the case of FIG. 2) and the first glass layer (in the case of FIG. 3). can do. This glass paste can be prepared in the same manner as in the case of the unfired glass layer when forming the second glass layer (in the case of FIG. 2) and the first glass layer (in the case of FIG. 3). It can apply | coat to the surface of a 2nd glass layer (in the case of FIG. 2) and a 1st glass layer (in the case of FIG. 3).

  The unfired glass layer in the subsequent formation of the glass layer when the intermediate laminate is warped, both ends in the long dimension direction of the other surface of the stainless steel sheet (the ends are not particularly limited, but 10 mm from the end, In particular, the thickness may be in a range of 5 mm.) And is fired by heating in a state of being supported by the end support. By supporting both end sides in this way, it is possible to suppress or prevent warping of the central portion excluding the both end sides. Examples of the “end support” include two rod-like bodies and the like mounted on the upper surface of the transport belt or the like at a predetermined interval (see the end support 21 in FIG. 4). The material of the rod-shaped body is not particularly limited as long as it can withstand the heating at the time of firing. However, the rod-shaped body has a heat resistance made of a metal having a melting point exceeding the firing temperature of 300 ° C. or more, preferably 400 ° C. or more, and a ceramic such as alumina. High rods are preferred.

  The cross-sectional shape of the end support is not particularly limited, and may be an irregular shape (see end support 21 in FIG. 4) other than a triangle, a quadrangle, a trapezoid, a semi-circle, etc. It is preferable that there is no shape. Further, the length of the end support is not particularly limited, but it is preferable that the end support is long enough to support the stainless steel sheet over its entire width. Further, the height of the end support is not particularly limited, but the ratio (L / h) between the dimension (L) between the both ends of the stainless steel sheet and the height (h) of the end support is 10 It is preferable that it is -60, and it is more preferable that it is 20-40.

  The laminated product of the stainless steel sheet, the first glass layer and the like and the unfired glass layer formed on the surface of the lower glass layer is warped downward by its own weight at the time of heating and firing, and cooled. In the process, this warping gradually recovers. The height of the end support affects the downward warpage due to its own weight and the recovery of warpage in the cooling process. The dimension (L) between both ends of the stainless steel sheet and the height of the end support By setting the ratio (L / h) to (h) to 10 to 60, it is possible to further suppress warping at the end of cooling.

The firing temperature, time, and atmosphere of the green glass layer in the subsequent glass layer formation when the intermediate laminate is warped can be the same as those of the green glass layer when the first glass layer is formed. Further, the firing temperature, time and atmosphere of the green glass layer may be the same as or different from the firing temperature, time and atmosphere of the green glass layer when forming the first glass layer, respectively. Also good. Further, the subsequent glass layer is formed by baking and then cooling to form the subsequent glass layer. This cooling method can be the same as that for the first glass layer.
Further, the thickness of the subsequent glass layer when the intermediate laminate formed in this way is warped is not particularly limited, and can be 5 to 30 μm, particularly 10 to 25 μm.

Subsequent glass layers when the intermediate laminate is warped can be formed as the second glass layer and the third glass layer as described above, and at least one glass layer can be further formed as necessary. . For example, an unfired glass layer containing glass powder (see the third glass powder 121c in FIG. 2, Ca when the lower glass layer is the second glass layer) is formed on the surface of the second glass layer. Thereafter, the third glass layer can be formed in the same manner as the second glass layer (see the third glass layer 12c in FIG. 2, Cf). In addition, a fourth glass layer (see the fourth glass layer 12d in FIG. 2, Df) can be further formed on the surface of the third glass layer in the same manner as necessary. The thickness of these glass layers is not particularly limited, and the thickness of one layer can be 5 to 30 μm, particularly 10 to 25 μm.
Thus, by forming a large number of glass layers, the warpage of the laminate at the end of cooling may be more sufficiently suppressed.

(4) Glass powder The glass powder contained in the green glass layer for forming each glass layer may be the same, the same kind, or different. The same kind means three kinds of elements in the descending order of the content of elements contained in the glass constituting each glass powder (the most stable oxide equivalent content of each element). Are the same, and the total oxide content of these three elements is 60% by mass or more, especially when the total oxide content of all the elements is 100% by mass. It means that it is 70 mass%, and also 80 mass%. These glass powders can be arbitrarily selected and used in combination.

(5) Formation of circuit pattern and formation of protective glass layer A laminate having a stainless steel sheet and a glass layer produced as described above usually has this glass layer as an insulating layer, and is formed on the surface of this insulating layer. A circuit pattern made of a conductor is formed, and a laminated body used as a light emitter such as a steel heater and an LED light emitter can be obtained. That is, in the method for producing a laminate of the present invention, a circuit pattern can be formed on the surface of at least one glass layer among the glass layers above the first glass layer (see circuit pattern 3 in FIG. 7). .

The method for forming the circuit pattern on the surface of the glass layer is not particularly limited, but the circuit pattern is formed by applying a conductive paste containing a metal powder such as silver, platinum, or copper to the surface of the glass layer. It can be formed by forming and then firing and then cooling. The conductive paste can be prepared by mixing the above metal powder, a solvent, an organic binder, and the like. Moreover, application | coating of a conductive paste and baking of a conductive coating film can be implemented similarly to application | coating of each glass paste and baking of a non-baking body when forming each glass layer. However, when the metal powder is an easily oxidized metal powder such as copper, it is preferably fired in an inert atmosphere such as a nitrogen gas atmosphere or a rare gas atmosphere.
Further, the thickness of the circuit pattern thus formed is not particularly limited, and can be 5 to 25 μm, particularly 10 to 20 μm.

  Further, when the circuit pattern is the outermost layer of the laminate, the circuit pattern may be oxidized and deteriorated, and may be damaged by contact with other articles. Therefore, it is preferable not to form a circuit pattern on the outermost surface of the glass layer. In the laminate manufacturing method of the present invention, the exposed portion of the outermost glass layer and the circuit pattern in the glass layer on which the circuit pattern is formed. It is preferable to form a protective glass layer (a part of two or more glass layers of the laminate produced by the method of the present invention) for protecting the surface of the protective glass layer (protective glass layer 5 in FIG. 7). reference).

Although the method for forming the protective glass layer is not particularly limited, the protective glass layer is formed by applying a glass paste containing glass powder to the exposed portion of the glass layer on which the circuit pattern is formed and the surface of the circuit pattern, It can be formed by firing and then cooling. As this glass powder, the same glass powder as in the formation of other glass layers can be used, and the application of the glass paste and the firing of the unfired body should be performed in the same manner as in the other glass layers. Can do. Furthermore, the glass powder used for forming the protective glass layer may be the same as, or the same as or different from the glass powder used for forming the other glass layer. This kind of meaning is as described above.
Further, the thickness of the protective glass layer thus formed is not particularly limited, and can be 5 to 35 μm, particularly 5 to 30 μm. Further, the protective glass layer may be one layer or two or more layers. However, if the thickness is 10 μm or more, particularly 15 μm or more, usually only one layer is sufficient.

[2] Steel heater and LED luminous body (1) Steel heater The steel heater 100 of the present invention includes a laminate manufactured by a method for manufacturing a laminate having two or more glass layers, and has at least one glass layer. A circuit pattern 311 formed on the surface of the substrate and having a heat generating action, an electrode terminal 313 for supplying power to the circuit pattern 311, and a power for supplying power from the electrode terminal 313 to the circuit pattern 311 having a heat generating action Supply circuit 312 and the exposed portion of the outermost glass layer of the glass layer on which the circuit pattern and the like are formed and the protective glass layer 5 formed on the surface of the circuit pattern 311 (the outermost glass layer of all the glass layers) (See FIG. 8 for the planar shape of the circuit pattern and the like).

  This steel heater is suppressed or prevented from warping and has high heat resistance, and even a particularly large display such as a flat panel display can be heated and dried uniformly.

(2) LED luminous body The LED luminous body 200 of this invention is equipped with the laminated body manufactured by the manufacturing method of the laminated body which has a 2 or more layer glass layer, and was the circuit formed in the surface of at least 1 layer of glass layer The pattern 32, the pad portion 4 on which the light emitting diodes arranged in the laminate and connected to the circuit pattern are mounted, and the exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed And a protective glass layer 5 formed on the surface of the circuit pattern 32 (becomes the outermost glass layer of all glass layers) (see FIG. 9 for the planar shape of the circuit pattern and the like).
The light emitting diode itself may or may not be covered by the protective glass layer 5.

  Since this LED light emitter is suppressed or prevented from warping and has high heat resistance and can be a long light emitter, it can be used as a backlight for liquid crystals, particularly large liquid crystals. The entire surface of the liquid crystal screen can emit light uniformly.

  Moreover, the circuit pattern should just be formed in the surface of the glass layer of at least 1 layer of the upper glass layers from a 1st glass layer, and this circuit pattern may be only one layer and may be two or more layers. That is, the glass layer having a circuit pattern formed on the surface thereof may be only one layer or two or more layers. In a multilayer substrate (see FIG. 10) having two or more glass layers on which circuit patterns are formed, each circuit pattern 32 is often connected by a via conductor 321 as shown in FIG. It is useful in various applications such as heaters and light emitters such as LED light emitters. In particular, light emitters such as LED light emitters can be controlled more easily by using a multilayer substrate. In addition, more complicated control can be performed.

Hereinafter, the present invention will be specifically described by way of examples.
[1] Laminate produced by firing at 850 ° C. Example 1
(1) Heat treatment of stainless steel sheet A stainless steel sheet (SUS430 sheet) having a length of 390 mm, a width of 35 mm, and a thickness of 0.4 mm was heated in a tunnel furnace at 850 ° C. for 10 minutes, and then removed from the furnace at room temperature (25 (0 ° C.) and then heat-treated.

(2) Formation of the first glass layer As shown in FIG. 2, a glass paste (containing the first glass powder 121a for forming the first glass layer 12a on one surface of the heat-treated stainless steel sheet 11 is contained. Si, B , Semi-crystalline glass powder containing Al and alkaline earth metal element, softening point 740 ° C., thermal expansion coefficient 9.1 × 10 ⁻⁶ / ° C.), frame size 800 mm × 800 mm, mesh # 200, emulsion Screen printing was performed using a printing mask having a thickness of 10 μm to form a coating film (see the diagram Aa in FIG. 2). Thereafter, the other surface of the stainless steel sheet on which the glass paste is printed is placed on the mesh belt 2 (flat support) of the tunnel furnace, and then fired and cooled to form a first glass layer having a thickness of 25 μm. 12a was formed (see the Af diagram in FIG. 2).

  Firing is performed at an average rate of 79 ° C./min from 25 ° C. to 850 ° C. (corresponding to the middle of Aa, Ab, and Ac in FIG. 2), and then 10% at 850 ° C. Held for a minute (corresponding to the remainder of A-c and Ad in FIG. 2), and then lowered from 850 ° C. to 25 ° C. at an average rate of 60 ° C./min (Ae and A- in FIG. 2). corresponding to f.) Performed with temperature profile. The following second glass layer, third glass layer, circuit pattern and protective glass layer were also fired with the same profile.

(3) Formation of the second glass layer On the surface of the first glass layer 12a, the glass paste (containing the second glass powder 121b, which is the same as the first glass powder 121a, in the same manner as described above. .) Was screen-printed to form a coating film (see the diagram of Ba in FIG. 2). Subsequently, it baked similarly to said (2), and it cooled and formed the 2nd glass layer 12b of thickness 25 micrometers (refer the figure of Bf of FIG. 2).

(4) glass paste on the surface of the formation of the third glass layer a second glass layer 12b (but contains a third glass powder 121 c, the glass powder is the same as the first glass powder 121a.) The similarly Screen printing was performed to form a coating film (see the diagram of Ca in FIG. 2). Thereafter, both ends in the length direction of the stainless steel sheet 11 are fired in the same manner as described above while being supported by the end support 21 made of alumina having a height of 11 mm placed on the mesh belt 2 of the tunnel furnace. Thus, a third glass layer 12c having a thickness of 20 μm was formed (see the diagram Cf in FIG. 2).

  As described above, a first glass layer, a second glass layer, and a third glass layer having a thickness of 20 μm each having a thickness of 25 μm are formed, and a total thickness of 70 μm is formed on one surface of the stainless steel sheet. The laminated body in which the glass layer was formed was manufactured.

(5) Formation of circuit pattern A conductive paste (containing Ag powder, trade name “6160”, manufactured by DuPont, Inc.) is printed on the surface of the third glass layer 12 using a mask having a predetermined pattern. A circuit pattern having a thickness of 15 μm was formed by firing in the same manner as described above in a state where both end sides in the length direction of the stainless steel sheet were supported by the end support.

(6) Formation of protective glass layer Predetermined glass paste (containing glass powder for protective layer. This glass powder is the same as the first glass powder) on the exposed portion of the third glass layer and the surface of the circuit pattern. After printing using a mask having a pattern of the following, the both ends in the length direction of the stainless steel sheet are baked in the same manner as described above in a state of being supported by the end support, and have a thickness of 25 μm. A glass layer was formed to produce a laminate.

(7) Evaluation of warpage and withstand voltage characteristics The first glass layer, the second glass layer, the third glass layer, the circuit pattern (conductor layer), and the protective glass layer formed as described in (1) to (6) above. The thickness of each was measured using a surface roughness meter, and the warpage in each step was measured using a caliper on a surface plate and evaluated. The results are listed in Table 1. Moreover, the withstand voltage when an AC voltage of 500 V was applied to the laminate for 3 seconds was measured. As a result, the leakage current was 1 mA or less and the withstand voltage characteristics were good regardless of whether the stainless steel sheet was heat-treated.
In Table 1, the evaluation criteria for warpage are: O: warpage is 2.5 mm or less, x: warpage is 3.5 mm or more.

Example 2
First to third glass layers were formed in the same manner as in the above (2) to (4) of Example 1. Thereafter, a glass paste (containing the fourth glass powder 121d. This glass powder is the same as the first glass powder 121a) is screen-printed on the surface of the third glass layer 12c to form a coating film (FIG. 2). (See the diagram of Da). Thereafter, both ends of the stainless steel sheet in the length direction were supported by the end support 21 and fired in the same manner as above to form a fourth glass layer 12d having a thickness of 20 μm (FIG. 2). (Refer to the figure of D-f). Thus, the laminated body 1 (refer FIG. 1) in which the glass layer 12 was formed in the surface of the stainless steel sheet 11 was formed. Next, the circuit pattern 3 was formed in the same manner as in (5) of Example 1, and then the protective glass layer 5 was formed in the same manner as in (6) of Example 1 to produce a laminate (FIG. 7). Further, warpage and withstand voltage were evaluated in the same manner as in (7) of Example 1. The evaluation results of warpage are shown in Table 1.
In FIG. 1 and FIG. 7, in order to make it easy to understand that the glass layer 12 is formed by the process as described above, a broken line is added as if it were four layers. The glass layer 12 is formed.

Example 3
A laminated body was produced in the same manner as in Example 2 except that the stainless steel sheet in (1) of Example 1 was not heat-treated, and warpage and voltage resistance were the same as in (7) of Example 1. And evaluated. The evaluation results of warpage are shown in Table 1.

Comparative Example 1 (using a flat support in the entire firing process)
In the entire process, the other surface of the stainless steel sheet was placed on the mesh belt 2 (support) of the tunnel furnace, and then fired to produce a laminate (see FIG. 5, second glass in FIG. 5). The formation up to the layer 12b is shown in the figure, and the subsequent illustration is omitted.) Other than that, a laminate was manufactured in the same manner as in Example 2. Further, warpage and withstand voltage were evaluated in the same manner as in (7) of Example 1. The evaluation results of warpage are shown in Table 1.

Comparative Example 2 and Comparative Example 3 (using the end support from the formation of the first glass layer)
The end support is formed from the formation of the first glass layer in (2) above by subjecting the stainless steel sheet of Example 1 (1) to heat treatment (Comparative Example 2) or without heat treatment (Comparative Example 3). The production of the laminate was started. As a result, the other surface of the stainless steel sheet was in contact with the mesh belt (support) of the tunnel furnace, making screen printing impossible, so the subsequent steps were stopped.

Comparative Example 4 and Comparative Example 5 (using the end support from the formation of the second glass layer)
The stainless steel sheet of Example 1 (1) was heat-treated (Comparative Example 4) or without heat treatment (Comparative Example 5), and the end support was formed from the formation of the second glass layer of (3). The laminated body was manufactured using it. As a result, when firing to form the second glass layer, the other surface of the stainless steel sheet is in contact with the mesh belt (support) of the tunnel furnace, and screen printing becomes impossible. Canceled.

Comparative Example 6 and Comparative Example 7 (use of end support from formation of circuit pattern)
In the steps (2) to (4) of Example 1, the other surface of the stainless steel sheet is placed on a mesh belt (support) of a tunnel furnace and fired, and the above (5) to (6). A laminate was produced in the same manner as in Example 1 except that the end support was used. Further, warpage and withstand voltage were evaluated in the same manner as in (7) of Example 1. The evaluation results of warpage are shown in Table 1.

Comparative Example 8 and Comparative Example 9 (no firing for forming the second glass layer and using the end support from the formation of the third glass layer)
Heat treatment of the stainless steel sheet of the above (1) of Example (1) (Comparative Example 8) or without heat treatment (Comparative Example 9), formation of the second glass layer of (3) above at 120 ° C. A laminate was produced only by drying for 15 minutes (no firing) and using the end support from the formation of the third glass layer. As a result, at the time of firing to form the third glass layer, the other surface of the stainless steel sheet is in contact with the mesh belt (support) of the tunnel furnace, and screen printing becomes impossible. Canceled.

Comparative Example 10 and Comparative Example 11 (no firing for forming the second glass layer and using the end support from the formation of the circuit pattern)
The stainless steel sheet (1) of Example 1 was heat-treated (Comparative Example 10) or not (Comparative Example 11), and the second glass layer (3) was formed at 120 ° C. for 15 minutes. The laminate was manufactured using only the edge support from the formation of the circuit pattern. As a result, the warpage of the intermediate laminate after forming the circuit pattern was large, and the subsequent steps were stopped.

Comparative Example 12 and Comparative Example 13 (no firing for forming the second glass layer, and only the end support is used for forming the protective glass layer)
The stainless steel sheet (1) of Example 1 was heat-treated (Comparative Example 12) or not (Comparative Example 13), and the second glass layer (3) was formed at 120 ° C. for 15 minutes. A laminated body was produced in the same manner as in Example 1 except that only the drying was performed (no firing) and the end support was used only to form the protective glass layer. Further, warpage and withstand voltage were evaluated in the same manner as in (7) of Example 1. The evaluation results of warpage are shown in Table 1.
In Examples 2 to 3 and Comparative Examples 1 and 4 to 13, the glass layers and the like are formed in the same manner as in Example 1 except that they are specified. There may be slight differences.

  According to the results in Table 1, in Examples 1 to 3, warpage is generated particularly by the formation of the protective glass layer, but in all cases, the warpage is 1.9 mm or less, which is excellent.

  On the other hand, in Comparative Example 1 in which the entire process was carried out with the stainless steel sheet placed on the support, the warp generated in the formation of the second glass layer remained almost as it was as the warp of the laminate, and was inferior. I understand. Further, in Comparative Examples 2 and 3 in which the first glass layer was formed using the end support, the warpage was −11.0 mm, that is, the other surface of the stainless steel sheet was in contact with the mesh belt of the tunnel furnace, Subsequent processes were canceled because screen printing was impossible. Furthermore, in Comparative Examples 4 and 5 in which the second glass layer was formed using the end support, the warpage during the formation of the second glass layer was -11.0 mm, and screen printing became impossible, so the subsequent steps were stopped. .

  Moreover, in Comparative Examples 6 and 7 in which the circuit pattern was formed using the end support, the warpage of the laminate was 5.2 mm or more, which was inferior. Furthermore, although the 3rd glass layer was formed using the edge part support body, in the comparative examples 8 and 9 which were not baked for forming a 2nd glass layer, the curvature at the time of 3rd glass layer formation was -11. Since it became 0.0 mm and screen printing became impossible, the subsequent steps were stopped. Further, in Comparative Examples 10 and 11 in which the firing for forming the second glass layer was not performed and the circuit pattern was formed using the end support, the large warp during the formation of the third glass layer was sufficiently recovered. However, since the warpage was large, the formation of the protective glass layer was stopped. Further, even in Comparative Examples 12 and 13 in which the protective glass layer was formed using the end support without firing for forming the second glass layer, the large warp during the formation of the third glass layer was sufficiently recovered. Not inferior.

[2] Laminate produced by firing at 550 ° C. Example 4
(1) Heat treatment of stainless steel sheet Heat treatment was performed in the same manner as in Example 1 above.

(2) Formation of first glass layer As shown in FIG. 3, a glass paste for forming the first glass layer 12 a (containing the first glass powder 121 a is contained on one surface of the heat-treated stainless steel sheet 11. Si, B , Semi-crystalline glass powder containing Al and alkaline earth metal element, softening point 414 ° C., thermal expansion coefficient 9.1 × 10 ⁻⁶ / ° C.), frame size 800 mm × 800 mm, mesh # 200, emulsion Screen printing was performed using a printing mask having a thickness of 10 μm to form a coating film (see the diagram Aa in FIG. 3). Thereafter, the other surface of the stainless steel sheet on which the glass paste is printed is placed on the mesh belt 2 (flat support) of the tunnel furnace, and then fired and cooled to a first glass layer having a thickness of 15 μm. 12a was formed (see A-f in FIG. 3).

  Firing is performed at an average rate of 37 ° C./min from 25 ° C. to 550 ° C. (corresponding to the middle of Aa, Ab, and Ac in FIG. 3), and then 10% at 550 ° C. Hold for a minute (corresponding to the rest of Ac and Ad in FIG. 3), and then decrease in temperature from 550 ° C. to 25 ° C. at an average rate of 28 ° C./min (Ae and A- in FIG. 3). corresponding to f.) Performed with temperature profile. The following second glass layer, third glass layer, fourth glass layer, circuit pattern and protective glass layer were fired with the same profile.

(3) Formation of second glass layer On the surface of the first glass layer 12a, the glass paste (containing the second glass powder 121b is contained in the same manner as described above. In Example 4, the second glass powder is the first glass powder. The same as glass powder 121a) was screen-printed to form a coating film (see the diagram of B-a in FIG. 3). Subsequently, both ends in the length direction of the stainless steel sheet 11 are fired in the same manner as described above while being supported by the same end support 21 as in Example 1 placed on the mesh belt 2 of the tunnel furnace. And it cooled and formed the 2nd glass layer 12b of thickness 15 micrometers (refer the figure of Bf of FIG. 3).

(4) Formation of third glass layer Glass paste (containing third glass powder 121c on the surface of second glass layer 12b. Contains Si, B, Al and alkaline earth metal element, softening point 397 ° C., heat In the same manner, screen-printing was performed on a semi-crystalline glass powder having an expansion coefficient of 9.2 × 10 ⁻⁶ / ° C. to form a coating film (see the diagram of Ca in FIG. 3). Thereafter, both ends in the length direction of the stainless steel sheet 11 were supported by the end support 21 and fired in the same manner as above to form a third glass layer 12c having a thickness of 15 μm (see FIG. 3 Cf figure).

(5) Formation of Fourth Glass Layer Similarly to the above, the surface of the third glass layer 12c contains a glass paste (fourth glass powder 121d. In this Example 4, the fourth glass powder 121d is the third glass. The same as powder 121c) was screen-printed to form a coating film (see the diagram of Da in FIG. 3). Thereafter, both ends of the stainless steel sheet in the length direction were supported by the end support 21 and fired in the same manner as above to form a fourth glass layer 12d having a thickness of 15 μm (FIG. 3). (Refer to the figure of D-f).

As described above, the first glass layer 12a, the second glass layer 12b, the third glass layer 12c, and the fourth glass layer 12d each having a thickness of 15 μm are formed, and the total thickness is formed on one surface of the stainless steel sheet 11. The laminated body 1 in which the glass layer 12 having a thickness of 60 μm was formed was produced (see FIG. 1).
In FIG. 1, in order to make it easy to understand that the glass layer 12 is formed by the process as described above, a broken line is added as if it were four layers, but in reality, an integrated glass layer without a boundary. 12 is formed.

(6) Formation of circuit pattern A conductive paste mainly composed of Ag powder is printed on the surface of the fourth glass layer 12d using a mask having a predetermined pattern, and then both end sides in the length direction of the stainless steel sheet. Was heated by 550 ° C. for 10 minutes and baked to form a circuit pattern 32 (see FIG. 9) having a thickness of 18 μm.

(7) Formation of Protective Glass Layer A glass paste (for the protective glass layer is used for the protective glass layer in the exposed portion of the fourth glass layer 12d and the surface of the circuit pattern 3; Is printed using a mask having a predetermined pattern, and then fired in the same manner as described above with both end sides of the stainless steel sheet being supported by the end support. Then, a protective glass layer 5 having a thickness of 10 μm was formed to produce a laminate (see FIG. 7).

(8) Evaluation of warpage and withstand voltage characteristics The first glass layer, the second glass layer, the third glass layer, the fourth glass layer, the circuit pattern, and the protective glass formed as described in (1) to (7) above. The thickness of each layer was measured in the same manner as in Example 1, and the warpage in each step was evaluated in the same manner as in Example 1. The results are listed in Table 2. Moreover, as a result of measuring the withstand voltage of the laminate in the same manner as in Example 1, the leakage current was 1 mA or less in any case, regardless of the presence or absence of heat treatment of the stainless steel sheet, and the withstand voltage characteristics were good. .
In Table 2, the evaluation criteria for warpage are: ◎; warpage is 0 mm, Δ: 1.5 mm or less, x: exceeds 1.5 mm.

Example 5
Each glass layer and circuit pattern were formed in the same manner as in the above (2) to (7) except that the stainless steel sheet in Example 4 (1) was not heat-treated, and a laminate was produced. . Further, warpage and withstand voltage were evaluated in the same manner as in (8) above. Table 2 shows the evaluation results of the warpage.

Comparative Example 14 (using a flat support in all firing steps)
The heat treatment of the stainless steel sheet in Example 4 (1) above was not performed, and all the steps (2) to (7) were performed on the other side of the stainless steel sheet on the mesh belt 2 (support) of the tunnel furnace. And then fired to produce a laminated body (see FIG. 5, the formation up to the second glass layer 12b is shown in FIG. 5, and the subsequent illustration is omitted). In the same manner as in Example 4, a laminate was produced. Further, warpage and withstand voltage were evaluated in the same manner as in (8) above. Table 2 shows the evaluation results of the warpage.

Comparative Example 15 and Comparative Example 16 (using end support in all firing steps)
The stainless steel sheet of Example 4 (1) was subjected to heat treatment (Comparative Example 15) or not subjected to heat treatment (Comparative Example 16), and all the steps (2) to (7) were carried out for the stainless steel sheet. Both ends in the long dimension direction of the other surface are supported by an end support, and then fired to produce a laminate (see FIG. 6, which shows the process up to the formation of the second glass layer 12b. The illustration after that was omitted.) Other than that, a laminate was manufactured in the same manner as in Example 4. Further, warpage and withstand voltage were evaluated in the same manner as in (8) above. Table 2 shows the evaluation results of the warpage.

Comparative Example 17 and Comparative Example 18 (The first and second glass layers are fired using a flat support, and the subsequent firing is performed using an end support)
The above-mentioned (1) stainless steel sheet of Example 4 was subjected to heat treatment (Comparative Example 17) or not subjected to heat treatment (Comparative Example 18), and the steps (2) and (3) were performed in addition to the stainless steel sheet. The surface is placed on a mesh belt (support) of a tunnel furnace and fired, and the steps (4) to (7) are performed on both ends in the long dimension direction of the other surface of the stainless steel sheet. A laminated body was produced in the same manner as in Example 4 except that the laminated body was produced by supporting and firing with a part support. Further, warpage and withstand voltage were evaluated in the same manner as in (8) above. Table 2 shows the evaluation results of the warpage.

Comparative Example 19 (The first, second, and third glass layers are fired using a flat support, and the subsequent firing is performed using an end support)
In the steps (2) to (4) above, the other surface of the stainless steel sheet was placed on the mesh belt (support) of the tunnel furnace without performing the heat treatment of the stainless steel sheet of Example 4 (1). In the steps (5) to (7), the both ends in the long dimension direction of the other surface of the stainless steel sheet are supported by the end supports and fired to produce a laminate. Otherwise, a laminate was produced in the same manner as in Example 4. Further, warpage and withstand voltage were evaluated in the same manner as in (8) above. Table 2 shows the evaluation results of the warpage.
In Example 5 and Comparative Examples 14 to 19, the glass layers and the like were formed in the same manner as in Example 4 except that they were specified. However, the thickness of each layer was slightly as shown in Table 2. It may be different.

  According to the results in Table 2, in Examples 4 and 5, the glass layer increased, the warpage was greatly reduced, and the warp might be slightly increased by forming the circuit pattern, but the protective glass layer was formed. It can be seen that the laminate as the final product is extremely excellent with no warping.

  On the other hand, in Comparative Example 14 in which the entire process was carried out by placing the stainless steel sheet on the support, the warp generated in the formation of the first glass layer remained almost as it was as the warp of the laminate, and was inferior. I understand. Further, in Comparative Examples 15 and 16 in which the entire process was carried out by supporting only the end portion of the stainless steel sheet, the downward warpage generated in the formation of the first glass layer was not sufficiently recovered and corresponds to a laminate. The warp remained.

Furthermore, in Comparative Examples 17 and 18 carried out by placing the stainless steel sheet on the support until the formation of the second glass layer, although the recovery of warpage is large compared to Comparative Examples 14 to 16, it is not sufficient, and the laminate Warping remained. Further, even in Comparative Example 19 in which the stainless steel sheet was placed on the support until the third glass layer was formed, the warpage was recovered as compared with Comparative Examples 14 to 16, but the warpage corresponding to the laminate was considerable. Remained.
Incidentally, the heat treatment of the stainless steel sheet does not greatly affect the recovery of the warp regardless of the examples and comparative examples, but the warp tends to be recovered more.

Example 6
In the laminate of Example 4, the circuit pattern 32 was formed on the surface of the fourth glass layer, and the circuit pattern 32 was further formed on the surface of the second glass layer. A laminated body was manufactured (see FIG. 10, but the via conductor 321 shown in FIG. 10 was not formed and the LED 4 was not disposed. The total thickness of the first and second glass layers was 55 μm, The total thickness of the third and fourth glass layers is 48 μm, the thickness of the circuit pattern is 12 μm, and the thickness of the protective glass layer is 20 μm). In this way, the multilayer substrate 300 having two circuit patterns was manufactured, and the withstand voltage was measured in the same manner as in the above (7) of Example 1, and it was formed on the surfaces of the stainless steel sheet 11 and the second glass layer. Withstand voltage between the circuit pattern formed on the surface of the second glass layer and the circuit pattern formed on the surface of the fourth glass layer is 500V. It turns out that it has sufficient withstand voltage.

  The present invention is not limited to the description of the above-described embodiments, and various modifications can be made within the scope of the present invention in accordance with the purpose and application. For example, a coating film using glass paste or conductive paste can be formed by transfer, spraying, or the like.

  The laminate manufacturing method of the present invention is used in the technical field of various circuit boards in which a stainless steel sheet is used as a substrate and a glass layer is used as an insulating layer and a circuit pattern is formed on the surface of the glass layer. be able to. For example, a heater having high heat resistance and a large area can be easily obtained. Therefore, it is useful in the technical field of steel heaters useful for heating, drying, etc. of a large display such as a flat panel display. Moreover, it is useful in the technical field of LED luminous bodies with high heat resistance and high brightness.

It is a schematic diagram of the cross section of an example of a laminated body in which a glass layer is formed on one surface of a stainless steel sheet by a plurality of operations. During the formation of the first and second glass layers, the glass powder is fired in a state where the entire other surface of the stainless steel sheet is in contact with a flat support, and after the formation of the third glass layer, among the other surfaces of the stainless steel sheet It is typical explanatory drawing of the process baked at 850 degreeC in the state which supported only the both ends of the long dimension direction of this by the edge part support body. When the first glass layer is formed, the glass powder is fired in a state where the entire other surface of the stainless steel sheet is in contact with a flat support, and after the formation of the second glass layer, the length of the other surface of the stainless steel sheet is long. It is typical explanatory drawing of the process baked at 550 degreeC in the state which supported only the both ends of the dimension direction with the edge part support body. It is a schematic diagram for demonstrating the correlation of the length and width of a laminated body, and an edge part support body intelligibly. It is typical explanatory drawing when implementing all the glass layer formation processes in the state which made the whole other surface of the stainless steel sheet contact the flat support body. It is typical explanatory drawing when implementing all the glass layer formation processes in the state which supported only the both ends of the longitudinal direction among the other surfaces of the stainless steel sheet by the edge part support body. It is a schematic diagram of the cross section of the laminated body in which the circuit pattern of 1 layer and the protective glass layer were formed. It is a typical top view of a steel heater provided with the laminated body manufactured by the method of this invention. It is a typical top view of a LED light-emitting body provided with the laminated body manufactured by the method of this invention. It is a schematic diagram of the cross section of an example of the multilayer substrate in which the two-layer circuit pattern was formed. In order to clarify [La (mm)] and [Ls], the figures Ae and Af in FIG. 3 are enlarged, and [La (mm)] and [Ls] It is explanatory drawing which described.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Laminated body, 11; Stainless steel sheet, 12; Glass layer, 12a; 1st glass layer, 12b; 2nd glass layer, 12c; 3rd glass layer, 12d; 4th glass layer, 121a; 121b; second glass powder, 121c; third glass powder, 121d; fourth glass powder. 2; support, 21; end support, 311; circuit pattern having heat generation, 312; power supply circuit, 313; electrode terminal, 32; circuit pattern, 321; via conductor, 4; Protective glass layer, 100; steel heater, 200; LED emitter, 300; multilayer substrate.

Claims (12)

A method for producing a laminate having a long stainless steel sheet and two or more glass layers provided on one side of the stainless steel sheet,
An unsintered glass layer is formed on one surface of the stainless steel sheet, and then the unsintered glass layer is fired in a state where the other surface of the stainless steel sheet is in contact with a flat support to form a first glass layer. And then, a method for producing a laminate in which an upper glass layer than the first glass layer is formed by firing an unfired glass layer formed on the surface of the lower glass layer,
When the intermediate laminate having the stainless steel sheet and the lower glass layer is warped so that the side of the lower glass layer is convex, both ends in the longitudinal direction of the other surface of the stainless steel sheet In a state where the side is supported by the end support, an upper glass layer is sequentially formed on the lower glass layer,
When the intermediate laminate is not warped so that the side of the lower glass layer is convex in a state where the other surface of the stainless steel sheet is in contact with a flat support, The manufacturing method of the laminated body characterized by forming an upper glass layer on a glass layer. A straight line connecting both ends in the long dimension direction on the other surface of the stainless steel sheet with respect to the length [La (mm)] in the long dimension direction of the stainless steel sheet when the intermediate laminate warps, The method for producing a laminate according to claim 1, wherein a ratio (Ls / La) of a shortest dimension [Ls] between the stainless steel sheet and the top of the other surface is 0.005 or more.   The temperature of the said baking is 750-950 degreeC, and when the said intermediate | middle laminated body curves, it is a time of forming the 2nd glass layer which is a 2nd glass layer, The laminated body of Claim 1 or 2 Production method.   The temperature of the said baking is 450-650 degreeC, and when the said intermediate | middle laminated body curves, it is a time of forming the 1st glass layer which is a 1st glass layer, The laminated body of Claim 1 or 2 Production method.   The said glass layer is 4-6 layers, The manufacturing method of the laminated body of any one of Claims 1 thru | or 4.   The method for producing a laminate according to any one of claims 1 to 5, wherein the stainless steel sheet has a thickness of 0.2 to 1.5 mm. The method for producing a laminate according to any one of claims 1 to 6, wherein the stainless steel sheet is heated at 500 to 950 ° C for 5 to 15 minutes in advance and then cooled and used.   The ratio (L / h) between the dimension (L) between the both ends of the stainless steel sheet and the height (h) of the end support is from 10 to 60. The manufacturing method of the laminated body of any one of these.   The manufacturing method of the laminated body of any one of the Claims 1 thru | or 8 with which the circuit pattern is formed in the surface of at least 1 layer of the glass layer of the upper layer from the said 1st glass layer.   The manufacturing method of the laminated body of Claim 9 with which the protective glass layer is formed in the exposed part of the glass layer of the outermost layer among the glass layers in which the said circuit pattern was formed, and the surface of this circuit pattern. A steel heater comprising a laminate produced by the laminate production method according to claim 10,
The circuit pattern formed on the surface of at least one of the glass layers above the first glass layer and having a heat generating action, an electrode terminal for supplying power to the circuit pattern, A steel heater comprising: an exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed; and the protective glass layer formed on the surface of the circuit pattern. An LED light emitter comprising a laminate manufactured by the method for manufacturing a laminate according to claim 10,
The circuit pattern formed on the surface of at least one of the glass layers above the first glass layer, and a light emitting diode disposed in the laminate and connected to the circuit pattern; An LED light emitter comprising: an exposed portion of the outermost glass layer of the glass layer on which the circuit pattern is formed; and the protective glass layer formed on the surface of the circuit pattern.

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