JP2019035137A - Vapor deposition apparatus, vapor deposition method, and production method of organic el display device - Google Patents

Abstract

To provide a vapor deposition apparatus capable of quickly and certainly removing heat generated by an electric magnet and capable of easily attaching/detaching and aligning a target substrate with a vapor deposition mask.SOLUTION: A vapor deposition apparatus is equipped with a vacuum chamber 8, a mask holder 15, a substrate holder 29 for holding a target substrate 2 so that the target substrate touches a vapor deposition mask 1, an electric magnet 3 arranged above a touch plate 4 installed opposite the vapor deposition mask 1 across the target substrate 2, a vapor deposition source 5 installed opposite the vapor deposition mask 1 for vaporizing or sublimating a vapor deposition material 51, and a heat pipe 7 of which at least a first end part, a heat absorbing part 71 touches the electric magnet 3 and of which a second end part, a heat releasing part 72 opposite the heat absorbing part 71 protrudes from the vacuum chamber 8. The heat pipe 7 is tight bonded with the electric magnet 3 in an area same as or larger than the cross-sectional area of the inner periphery of a coil 32 of the electric magnet 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vapor deposition apparatus, a vapor deposition method, and a method for manufacturing an organic EL display apparatus, for example, for vapor-depositing an organic layer of an organic EL display apparatus.

  For example, when an organic EL display device is manufactured, a driving element such as a TFT is formed on a support substrate, and an organic layer is laminated on the electrode corresponding to each pixel. This organic layer is sensitive to moisture and cannot be etched. Therefore, the organic layer is laminated by stacking a support substrate (substrate to be deposited) and a vapor deposition mask and depositing an organic material through the opening of the vapor deposition mask. Then, a necessary organic material is laminated only on the necessary pixel electrode. If the deposition substrate and the deposition mask are not as close as possible, an organic layer is not formed only in an accurate region of the pixel. If the organic material is not deposited only on the accurate pixel region, the display image tends to be unclear. Therefore, a magnetic chuck that uses a magnetic material for the vapor deposition mask and interposes the vapor deposition substrate between the permanent magnet or electromagnet and the vapor deposition mask is used to bring the vapor deposition substrate and the vapor deposition mask closer (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2008-024956

  Conventionally, a metal mask has been used as a vapor deposition mask, but recently, in order to form a finer opening, it is formed of a resin film, and a portion excluding the periphery of the opening of the resin film is supported by a metal support layer. Hybrid vapor deposition masks tend to be used. An evaporation mask with a small amount of magnetic material, such as a hybrid mask, cannot perform sufficient adsorption unless a stronger magnetic field (magnetic field) is used.

  As described above, if the adsorption is not sufficient, the accessibility between the deposition target substrate and the deposition mask decreases. A strong magnetic field is required to sufficiently attract the deposition mask to the deposition substrate. When a permanent magnet is used as the magnet of the magnetic chuck, when the magnetic field is strong, it is difficult to align the deposition substrate and the deposition mask. On the other hand, when an electromagnet is used, the magnetic field can be made almost zero by turning off the application of current to the coil of the electromagnet, and the magnetic field can be generated and attracted by applying the current. Therefore, the magnetic field can be applied after the alignment without applying the magnetic field at the time of alignment, so that the alignment between the evaporation target substrate and the evaporation mask becomes easy.

  However, in order to generate a large magnetic field using an electromagnet, it is necessary to increase the current. The strength of the magnetic field of the electromagnet is proportional to the product of the number of turns of the electromagnet coil and the current flowing through the coil. Therefore, to increase the magnetic field, it is necessary to increase the current or increase the number of turns. Either method increases the calorific value. Since a large current is originally applied to the coil of the electromagnet, an electric wire having a small resistance is used for the coil of the electromagnet, but the electromagnet generates heat due to a resistance loss of the current. Furthermore, when a core (iron core) is used for an electromagnet, the generated magnetic field can be increased, but heat is generated by eddy current. Accordingly, if the current is further increased in order to increase the generated magnetic field, heat generation becomes even more problematic.

  On the other hand, when heat is generated, the heat propagates to the deposition target substrate and the deposition mask, and the temperature rises. Since the deposition target substrate and the deposition mask are made of different materials, their linear expansion coefficients are also different. For example, if the difference in linear expansion coefficient between the deposition substrate and the deposition mask is 3 ppm / ° C., a panel having a length of 1 m has a deviation of 3 μm per 1 ° C. between the ends. For example, if one side of the size of one pixel is 60 μm, it is considered that only a deviation of about 15% is allowed at a resolution of 5.6 k. Then, the limit of the deviation is 9 μm. In the above example, a 3 μm shift occurs with a temperature increase of 1 ° C., so a temperature increase of 3 ° C. is the limit. That is, it is necessary to suppress the temperature rise of the deposition target substrate and the deposition mask due to the temperature rise of the electromagnet to 3 ° C. or less. On the other hand, since the electromagnet is disposed in the vacuum chamber, it is difficult to dissipate heat by blowing or convection. It is conceivable to wrap a metal pipe and to cool it by flowing cooling water into it, but it takes time to dissipate heat through the cooling water, and it is not possible to sufficiently dissipate the large amount of heat generated in a short time. When the joint portion bursts, a large amount of water overflows into the vacuum chamber, and there is a risk that the vacuum chamber is broken.

  The present invention has been made to solve such a problem, and is capable of immediately and surely cooling the heat generated by the electromagnet or desorbing the deposition substrate and the deposition mask while suppressing the generated heat. It is an object of the present invention to provide a vapor deposition apparatus and a vapor deposition method that can be easily aligned with each other.

  Another object of the present invention is to provide a method for producing an organic EL display device having excellent display quality by using the vapor deposition method.

  A vapor deposition apparatus according to a first embodiment of the present invention includes a vacuum chamber, a mask holder that holds a vapor deposition mask disposed inside the vacuum chamber, and a vapor deposition target that is in contact with the vapor deposition mask held by the mask holder. A substrate holder for holding the substrate, an electromagnet disposed above the surface opposite to the vapor deposition mask of the vapor deposition substrate held by the substrate holder, and opposed to the vapor deposition mask are provided to vaporize or sublimate the vapor deposition material. A heat pipe in which a vapor deposition source to be used and at least a heat absorption part as a first end part are provided in contact with the electromagnet, and a heat radiation part as a second end part opposite to the heat absorption part is led out of the vacuum chamber And a contact portion between the heat pipe and the electromagnet is in close contact with each other with an area equal to or larger than the cross-sectional area of the inner circumference of the coil of the electromagnet.

  In the vapor deposition method of the second embodiment of the present invention, an electromagnet, a vapor deposition substrate, and a vapor deposition mask having a magnetic material are superposed, and the vapor deposition mask is attracted to the vapor deposition substrate by energizing the electromagnet. And a step of depositing the vapor deposition material on the vapor deposition substrate by scattering of the vapor deposition material from a vapor deposition source disposed away from the vapor deposition mask, and from the cross-sectional area of the inner periphery of the coil of the electromagnet The vapor deposition material is deposited while the electromagnet is cooled by a heat pipe closely attached to the electromagnet over a wide area.

  In the method for manufacturing an organic EL display device according to the third embodiment of the present invention, at least a TFT and a first electrode are formed on a support substrate, and an organic material is deposited on the support substrate using the above-described deposition method. Forming a laminated film of an organic layer, and forming a second electrode on the laminated film.

  According to the vapor deposition apparatus and vapor deposition method of the first and second embodiments of the present invention, the temperature rise of the vapor deposition substrate and the vapor deposition mask due to the heat generated by the electromagnet is suppressed. And the position shift of the vapor deposition mask and vapor deposition board | substrate by thermal expansion is suppressed. As a result, the deposition accuracy of the organic layer is improved, and deposition is performed with an accurate pattern. When used for manufacturing an organic EL display device, a high-definition display panel can be obtained with fine pixels.

It is a figure which shows the schematic of the vapor deposition apparatus of one Embodiment of this invention. It is a figure explaining the structural example of the heat pipe of FIG. It is a figure explaining the modification of the heat pipe of FIG. It is a figure which shows the other embodiment of joining of an electromagnet and a heat pipe. It is a figure which shows other embodiment of joining of an electromagnet and a heat pipe. It is a figure which shows other embodiment of joining of an electromagnet and a heat pipe. It is VB-VB sectional drawing of FIG. 5A. It is a top view of the heat pipe which shows other embodiment of joining of an electromagnet and a heat pipe. It is VIB-VIB sectional drawing of FIG. 6A. It is the perspective view which rounded the heat pipe of FIG. 6A. It is a figure which shows the state which embeds the heat pipe of FIG. 6C in the inside of a core. It is explanatory drawing of the heat pipe for demonstrating other embodiment of joining of an electromagnet and a heat pipe. It is a top view of the heat absorption part of FIG. 7A. It is explanatory drawing of the wick structure of FIG. 7B. It is a schematic diagram which shows the state which integrated the heat pipe of FIG. 7A in the vapor deposition apparatus. It is a figure which shows the structural example which connects a heat pipe to a vacuum chamber. It is an enlarged view of an example of a vapor deposition mask. It is a figure which shows the vapor deposition process by the manufacturing method of the organic electroluminescent display apparatus of this invention. It is a figure which shows the state by which the organic layer was laminated | stacked with the manufacturing method of the organic electroluminescence display of this invention.

  Next, the vapor deposition apparatus and vapor deposition method of the first and second embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the vapor deposition apparatus of this embodiment includes a vacuum chamber 8, a mask holder 15 that holds a vapor deposition mask 1 disposed inside the vacuum chamber 8, and a vapor deposition mask that is held by the mask holder 15. 1, a substrate holder 29 that holds the deposition substrate 2 so as to be in contact with the substrate 1, an electromagnet 3 that is disposed on the opposite side of the deposition mask 1 of the deposition substrate 2 that is held by the substrate holder 29, and the deposition mask 1 The vapor deposition source 5 that vaporizes or sublimates the vapor deposition material 51 and the heat absorption part 71 that is at least the first end are provided in contact with the electromagnet 3 and are the second end opposite to the heat absorption part 71. The heat radiating part 72 has a heat pipe 7 led out of the vacuum chamber 8, and the contact part between the heat pipe 7 and the electromagnet 3 is in close contact with an area larger than the cross-sectional area of the inner periphery of the coil 32 of the electromagnet 3. They are joined Te. In FIG. 1, reference numeral 4 denotes a touch plate that cools the deposition substrate 2 and prevents deformation of the deposition substrate 2.

  Here, the electromagnet 3 means a magnetic field that is generated by energizing the coil 32 and loses the magnetic field when the energization is stopped. When the core (magnetic core, iron core) 31 is provided inside the coil 32, the core 31 is used. When the yoke 33 is further attached to the core 31, the yoke 33, and when the coil 32 and the core 31 are integrated with a covering 34 such as resin (see FIG. 3), the meaning including the covering 34 and the like is also included. It is. Further, the heat absorbing portion 71 of the heat pipe 7 refers to a contact portion between the heat pipe 7 and the electromagnet 3.

  Although the schematic structure of the vapor deposition apparatus will be described later, as shown in FIG. 1, the vapor deposition mask 1 and the vapor deposition substrate 2 are arranged side by side in the vertical direction. In order to obtain the adhesion (good accessibility), a magnetic chuck method is employed in which the magnet 3 is disposed above the surface opposite to the vapor deposition mask 1 of the substrate 2 and the vapor deposition mask 1 is attracted by the magnetic field of the magnet. Has been. In this case, the strong magnetic field is strongly adsorbed. However, if a permanent magnet is used for this magnet, a strong magnetic field is also acting when the deposition mask 1 and the deposition substrate 2 are aligned, so that the deposition substrate 2 and the deposition mask 1 are close to each other. Is always strongly adsorbed. Therefore, there is a problem that it is difficult to accurately align the deposition target substrate 2 and the deposition mask 1.

On the other hand, when the electromagnet 3 is used as a magnet, the alignment can be performed without generating a magnetic field by turning off the current of the electromagnet 3 at the time of alignment. As a result, alignment can be easily performed. However, if a current is passed through the electromagnet 3 to generate a magnetic field after alignment, the problem arises that the electromagnet 3 generates heat. That is, the magnetic field generated by the electromagnet 3 is proportional to the product n · I of the number of turns n of the coil 32 of the electromagnet 3 and the current I flowing through the coil 32. Therefore, if the vapor deposition mask 1 is to be attracted by a sufficient magnetic field, it is necessary to increase the current I or increase the number n of turns of the coil 32. When the number of turns n of the coil 32 is increased, the electric wire becomes longer and the electric resistance R increases. That is, the Joule heat I ² · R increases regardless of whether the current I or the number of turns n of the coil 32 is increased. For this reason, the problem of heat generation increases as the magnetic field is increased.

For example, when vapor deposition is performed using a 1 m square (1 m × 1 m) vapor deposition mask 1, a structure in which small electromagnets 3 (hereinafter referred to as unit electromagnets 3) as shown in FIG. It is preferable to make it uniform from the viewpoint of uniform magnetic distribution and easy heat dissipation. In this case, for example, about 25 electromagnets 3 each having a 20 cm square core 31 are arranged to cover the vapor deposition mask 1 described above. One unit electromagnet 3 is wound around an electric wire having a length of about 100 m around the core 31. If this wire uses a copper wire with a diameter of about 1 mm (resistivity 1.72 × 10 ⁻⁸ Ω · m) (if a relatively inexpensive aluminum wire is used, the resistivity is 2.78 × 10 ⁻⁸ Ω · m) When the length is 100 m, the resistance R is about 2.2Ω.

If the current per unit electromagnet 3 is ^{2 A} , the amount of heat generated is I ² · R = 8.8 W. The vapor deposition time per one substrate to be vapor-deposited 2 (energization time) is about 120 seconds. For example, when the unit electromagnet 3 is continuously operated for 2 minutes, 8.8 W × 120 s = 1056 J (Joule). Generate heat. This corresponds to 252cal and causes a temperature rise of about 15 ° C. Since there are 25 electromagnets 3 in this unit, the amount of heat generated is 6300 cal, but the volume (area) also increases, and the temperature of the entire electromagnet 3 does not increase 25 times. However, there is also a mutual thermal action between the adjacent units of the electromagnets 3, and it may vary depending on the surrounding heat capacity, such as the presence or absence of the covering 34. Moreover, in practice, since the deposition substrate 2 is replaced and vapor deposition is performed continuously, the electromagnet 3 is further heated before it is completely cooled down, and the amount of heat is accumulated to further increase the temperature. . Considering these, it is considered that the maximum temperature rises by about 20 ° C. in the entire electromagnet 3. The temperature rise of the vapor deposition mask 1 and the like due to the temperature rise of the electromagnet 3 may vary depending on various conditions. If the temperature rise of the electromagnet 3 is about 20 ° C., the temperature of the deposition target substrate 2 and the vapor deposition mask 1 is about 12 ° C. It is expected to rise.

  On the other hand, when the temperature of the deposition target substrate 2 and the deposition mask 1 rises, thermal expansion occurs. However, since the deposition target substrate 2 and the deposition mask 1 are made of different materials, there is a difference in thermal expansion. For example, even if the deposition substrate 2 is glass and an invar with a small expansion is used for the metal support layer 12 (see FIG. 9) of the deposition mask 1, the difference in linear expansion coefficient between the deposition substrate 2 and the deposition mask 1 is 3 ppm. / ° C occurs. When the coefficient of thermal expansion differs by 3 ppm / ° C., a shift of 3 μm occurs between one end and the other end of the 1 m display panel. With an increase in the size of display devices and higher definition such as 4k and 8k, for example, the resolution of 5.6k is considered to be limited to about 15% of pixel shift. In the above-described large screen having one side of about 1 m, the size of each pixel is about 60 μm on one side, and a 15% deviation is 9 μm. That is, if there is a temperature rise of 3 ° C., it becomes a limit for obtaining a fine image. Since a temperature increase due to heat radiation from the vapor deposition source 5 is also conceivable, a temperature increase due to the electromagnet 3 must be avoided as much as possible. In short, it is the present inventors that the temperature rise of the vapor deposition mask 1 by the electromagnet 3 must be suppressed to 10 ° C. or less, preferably 5 ° C. or less, more preferably 3 ° C. or less at worst (even when the resolution is low). Found.

  In the above example, the size of one side of the display panel is 1 m, but generally, one side of the display panel and one side of one pixel change approximately proportionally if the resolution is the same. Therefore, for example, when trying to make the same resolution (a resolution of 5.6k in the above example) on a display panel having a side of 50 cm, the length of one side of one pixel is 30 μm. Therefore, a deviation of 4.5 μm (15%) is allowed for a length of 50 cm. That is, 4.5 μm / 50 cm = 9 ppm, and when the difference in linear expansion coefficient is 3 ppm / ° C., it is allowed up to 3 ° C. In short, this relationship holds for any size display device if the resolution is the same and the allowable rate of pixel shift is the same. However, if the resolution is not required to be so high, for example, if it is about the resolution of the current television, it is considered that the degree of deviation can be accepted up to about 40%. Therefore, a 1 m long panel can tolerate a deviation of about 25 μm. That is, the temperature rise of the vapor deposition mask 1 due to heat conduction from the electromagnet 3 depends on the definition of the display panel, but when a definition of about 8k is required, it is 2 ° C. or less and 5 ° C. for a definition of about 4k. Hereinafter, the present inventors have found that the electromagnet 3 needs to be dissipated so that the resolution is about 10 ° C. or less even when the definition is as high as that of a normal television.

  From this point of view, the present inventors have not been able to cool the electromagnet 3 by water cooling, and since they are inside the vacuum chamber 8, heat can not be released by air blowing or convection, and the heat pipe 7 has been adopted. . In this case, if the heat pipe 7 is used, the environment can be sufficiently cooled at the ambient temperature. However, in the vacuum evaporation apparatus, as shown in FIG. 1, the electromagnet 3, the evaporation target substrate 2, the evaporation mask 1, and the like. Are placed very close together. For this reason, it is preferable to provide the heat pipe 7 in the vicinity of the surface of the electromagnet 3 facing the deposition target substrate 2, but the ordinary rod-shaped heat pipe 7 has no space for placement. On the other hand, according to the heat pipe 7, the heat generated in the electromagnet 3 can be discharged to the outside of the vacuum chamber 8 by disposing the heat radiating portion 72 (see FIG. 1) outside the vacuum chamber 8. Therefore, since the temperature rise inside the vacuum chamber 8 is efficiently suppressed, the use of the heat pipe 7 is preferable.

  If a space is provided for inserting the rod-shaped heat pipe 7, the distance between the electromagnet 3 and the vapor deposition mask 1 is increased. As a result, the magnetic field at the vapor deposition mask 1 becomes weak, and the attractive force decreases. In order to secure the attractive force, it is necessary to increase the current in order to further increase the magnetic field of the electromagnet 3, and as a result, heat is generated further. Therefore, in the case where the heat pipe 7 is arranged away from the surface of the electromagnet 3 facing the deposition substrate 2, almost all the heat generated from the electromagnet 3 needs to be absorbed. In addition, the present inventors have found that how to arrange them becomes a very big problem.

  As a result of intensive studies to solve such problems, the present inventors contacted the heat pipe 7 with the electromagnet 3 over a wide area even on the surface opposite to the surface facing the vapor deposition mask 1 of the electromagnet 3. It has been found that the temperature of the end face of the electromagnet 3 facing the vapor deposition mask 1 can be lowered. Specifically, the temperature of the electromagnet 3 itself is lowered by bringing the heat absorption part 71 of the heat pipe 7 and the electromagnet 3 into contact (contact) with an area larger than at least the inner circumferential cross-sectional area of the coil 32 of the electromagnet 3. The present inventors have found that the temperature rise of the vapor deposition mask 1 can be suppressed.

  In other words, it is particularly important to cool the portions of the coil 32 and the core 31 that generate heat, and it is effective to bring the heat absorbing portion 71 of the heat pipe 7 into contact with the portions. That is, as described above, the purpose is to prevent the temperatures of the deposition target substrate 2 and the deposition mask 1 from increasing, so it is preferable to reduce the temperature of the end face of the electromagnet 3 facing the deposition mask 1. However, when there is no appropriate cooling means, it is necessary to lower the temperature of the electromagnet 3 itself. In this case, since the temperature of the coil 32 and the core 31 rises most, it is important to reduce the temperature of this part. Therefore, it is necessary to make the heat absorption part 71 of the heat pipe 7 contact the core 31 or the coil 32 of the electromagnet 3 in as wide an area as possible. That is, considering that the coil 32 is wound around the entire end face of the core 31 and the outer periphery thereof at least, it is preferable to contact with the cross-sectional area of the outer periphery of the coil 32 or more.

  The reason why the coil 32 is brought into contact with the inner circumferential cross-sectional area or an area larger than that is that the electromagnet 3 is usually provided with a core (magnetic core) 31 in order to obtain a strong magnetic field, and the coil 32 is wound around it. Is done. Accordingly, the cross-sectional area of the inner periphery of the coil 32 is substantially equal to the cross-sectional area of the core 31. On the other hand, the heat generation of the electromagnet 3 is the heat loss of the coil 32 due to the resistance loss of the coil 32 and the resistance loss due to the eddy current generated in the core 31 when the core 31 is provided. Since the coil 32 is generally wound around the core 31, the heat generated in the coil 32 is in close contact with the core 31, and the heat of the coil 32 is easily transmitted to the core 31. Therefore, the present inventors have found that the generated heat can be efficiently dissipated by bringing the heat pipe 7 into contact with at least the entire end face of the core 31 in order to cool the core 31. Further, considering the contact with the coil 32 that generates heat, it is preferable that the cross-sectional area of the outer periphery of the coil 32 or larger than that. In order to increase the contact area, it is preferable that a part of the heat absorbing portion 71 of the heat pipe 7 is embedded in the core 31, but if the core 31 is cut too much, the magnetic field is weakened.

  However, as described above, the electromagnet 3 includes not only the coil 32 and the core 31 but also the yoke 33 when the yoke 33 is connected as shown in FIG. In addition, as shown in FIG. 3, when the core 31, the coil 32, the yoke 33, and the like are integrated with a covering 34 such as a resin, the covering 34 is regarded as a part of the electromagnet 3. Can be done. Therefore, as shown in FIG. 1, when the yoke 33 is connected, the yoke 33 is formed with a width larger than the diameter of the core 31. The contact area can be increased without embedding part of the inside.

  Moreover, the coil 32, the core 31, etc. may be integrated by the covering 34, such as resin (refer FIG. 3), and the heat absorption part 71 of the heat pipe 7 may be embedded in the inside of the covering 34. Furthermore, a part of the heat absorbing portion 71 of the heat pipe 7 may be embedded inside the core 31 or the yoke 33 (see FIGS. 1 and 4). Alternatively, the heat absorption part 71 of the heat pipe 7 can be formed long and inserted deeply into the core 31 so as not to significantly affect the formation of the magnetic field (FIGS. 5A to 5B). Furthermore, the heat absorption part 71 of the heat pipe 7 may be flat (flat) to form a ring shape, and the heat absorption part 71 of the ring-shaped heat pipe 7 may be embedded in the core 31 (FIG. 6D). Further, as shown in pages 41 to 56 of Thermal Science & Engineering Vol. 2 No. 3 (2015), the planar heat absorbing portion 71 of the loop type heat pipe 7 is connected to the vapor deposition mask 1 of the entire electromagnet 3. It may be provided on the opposite end faces (FIGS. 7A to 7D). In this case, instead of the touch plate 4 (see FIG. 1), it is also possible to use only the flat plate-like heat absorbing portion 71. That is, not only cooling but also warpage of the deposition target substrate 2 can be suppressed by the flat heat absorbing portion 71 of the loop type heat pipe 7.

  Further, the core 31 is made of iron or the like, and the heat conduction is not so good. Therefore, it is preferable that the coating 31 b made of a material having a high thermal conductivity such as copper is formed on the surface of the core 31, at least in the vicinity of the contact portion with the heat pipe 7. By bringing the heat pipe 7 into close contact with the electromagnet 3 over as wide an area as possible, the heat generated by the electromagnet 3 can be efficiently discharged out of the vacuum chamber 8. A method for increasing the contact area between the electromagnet 3 and the heat pipe 7 will be described later.

(Structure of heat pipe)
The heat pipe 7 has a structure as shown in FIG. 2A as a typical example. That is, for example, a wick 76 that moves liquid by capillary action is formed on the inner wall of a vacuum-sealed pipe (case; container) 75 that is made of copper or the like. A vacuum (low pressure) structure in which a small amount is enclosed. With this structure, when heated by the ambient heat at the heat absorbing portion 71, which is one end, the working fluid evaporates and steam is generated, and the internal pressure of the pipe 75 increases. The vapor passes through the space portion 73 and is condensed and liquefied in a heat radiating portion (cooling portion) 72 which is the other end portion. The liquefied liquid travels toward the heat absorption part 71 by capillary action in the wick 76 formed on the inner wall of the pipe 75. Due to such latent heat transfer accompanying evaporation and condensation, a large amount of heat is transported from the heat absorbing portion 71 to the heat radiating portion 72 even with a small temperature difference, and the heat pipe 7 is 100 times as much as the heat conduction of a copper round bar. It is said to reach. The wick 76 only needs to have a structure in which a liquid proceeds by capillary action, and may have a structure such as a wire net, a porous body, or a sponge.

  As described above, when the heat pipe 7 is disposed sideways, the condensed liquid passes through the wick 76 and is carried to the heat absorbing unit 71. However, for example, when the heat pipe 7 is disposed vertically and the lower side is the heat absorbing portion 71 (that is, the portion where the temperature is high is located below the heat pipe 7), the liquid is formed on the lower side. It evaporates and the vapor rises upward and condenses in the heat radiating section 72. In this case, even if there is no wick 76, the liquefied liquid falls by its own weight and returns to the heat absorption unit 71. This is said to be thermosiphon type. In this embodiment, any type of heat pipe 7 can be used. For example, even when the heat pipe 7 is arranged vertically, the wick 76 may exist.

  FIG. 2B is a diagram showing a heat pipe 7 which is another structural example. The heat pipe 7 is filled with a working liquid such as water. On the other hand, the heat pipe 7 is provided such that the heat absorbing portion 71 is in contact with the electromagnet 3 as described above. Therefore, it is provided inside the vacuum chamber 8. If the heat pipe 7 is broken, the liquid enclosed inside leaks into the vacuum chamber 8. If liquid leaks into the vacuum chamber 8, its reliability and maintenance become difficult.

  The structure shown in FIG. 2B is for solving such a problem, and is formed in a double structure. That is, for example, the end portion of the heat-absorbing portion 71 of the pipe 75 of the heat pipe 7 is constituted by the closing plate 77 and the flange portion 75a, and the protective pipe 78 is provided on the flange portion 75a by welding or brazing, A space 79 is formed between the protective pipe 78 and the pipe (container) 75. This space 79 may be evacuated. With such a structure, the working fluid does not leak into the vacuum chamber 8 even if the pipe (container) 75 is broken.

  Moreover, the heat pipe 7 is not limited to a rod-like shape as shown in FIG. 2A, but can be formed into a flat shape (flat plate shape) as shown in FIGS. 6A to 6B described later. In this case, the pipe (container) 75 can also be formed of a thin metal plate or a synthetic resin that can be bent while having sufficient rigidity to hold the space 73. Furthermore, for example, a loop heat pipe 7 as shown in FIGS. 7A to 7C described later can be used. Such a loop-type heat pipe 7 is formed in a very thin flat (flat plate) heat absorbing portion 71 of, for example, about 10 mm, and therefore is disposed on the front surface of the electromagnet 3, that is, on the end surface facing the vapor deposition mask 1. Can do. In this case, the touch plate 4 shown in FIG. 1 can be omitted, and the heat absorption part 71 of the heat pipe 7 can be substituted. As a result, the heat pipe 7 can be arranged with little influence on the attractive force of the electromagnet 3.

  Next, an embodiment in which the heat pipe 7 and the electromagnet 3 are brought into contact with each other in an area larger than the cross-sectional area of the inner periphery of the coil 32 will be described.

(Embodiment 1)
In this embodiment 1, as shown in FIG. 1, the electromagnet 3 has a core 31, a coil 32 formed by winding an electric wire around the core 31, and a cross section connected to the end of the core 31. It is formed of a C-shaped yoke 33 (E-shaped yoke together with the core 31). For example, a heat pipe 7 as shown in FIG. 1 is provided connected to the back surface of the yoke 33 (the surface opposite to the surface facing the vapor deposition mask 1). By adopting a structure in which the heat pipe 7 is brought into contact with the yoke 33, the contact area can be made larger than the cross-sectional area of the inner periphery of the coil 32 by increasing the diameter of the heat pipe 7.

  In the example shown in FIG. 1, the heat absorbing portion 71 of the heat pipe 7 is disposed in the yoke 33. It is not essential that part of the heat absorbing portion 71 of the heat pipe 7 is embedded in the yoke 33. If the area of the end face of the heat pipe 7 is larger than the cross-sectional area of the inner periphery of the coil 32, the heat is sufficiently radiated. However, as described above, the larger the contact area between the two, the better. That is, not only the area of the end surface of the heat pipe 7 but also the area of the peripheral surface of the embedded portion is in contact. Thereby, the heat dissipation effect of the electromagnet 3 is improved. On the other hand, the yoke 33 serves as a path for magnetic lines of force, so if it is embedded too deeply, the lines of magnetic force are obstructed. However, the influence can be suppressed by forming the yoke 33 thick beforehand.

  Although not shown, the heat dissipation effect is further enhanced by forming the coating 31b having a high thermal conductivity by copper plating or the like on the surface of the core 31 or the surface of the yoke 33. The heat pipe 7 has a heat conductivity that is about 100 times higher than that of copper. However, as described above, the space in which the heat pipe 7 is effectively brought into contact with the electromagnet 3 is limited. Therefore, it is preferable to improve heat conduction in the electromagnet 3 up to the heat pipe 7 arranged at a limited position.

  By providing the yoke 33, the magnetic field which acts on the vapor deposition mask 1 becomes strong. Since the magnetic pole of the surface opposite to the surface facing the vapor deposition mask 1 of the electromagnet 3 comes near the end surface facing the vapor deposition mask 1 through the yoke 33, the magnetic resistance is smaller than that through the air and a strong magnetic field can be obtained. . As a result, the number of currents or electromagnets 3 for obtaining a desired attractive force can be reduced, heat generation is further prevented, and the temperature rise of the vapor deposition mask 1 and the like is suppressed.

(Embodiment 2)
In the configuration of the second embodiment, as shown in FIG. 3, the coil 32, the core 31, and the yoke 33 are integrally covered with a covering 34 such as a heat resistant resin such as an epoxy resin. The material of the covering 34 is not limited to this example, but is preferably a material that hardly generates gas because it is disposed inside the vacuum chamber 8. For example, PEEK (polyetheretherketone) can be used. Particularly preferred are those having good heat conduction. A filler such as metal powder may be mixed as necessary.

  In the example shown in FIG. 3, the heat absorbing portion 71 of the heat pipe 7 is attached in a state of being in contact with the surface of the yoke 33. Even in such a structure, since the heat absorbing portion 71 of the heat pipe 7 is embedded in the covering 34, the side surface of the heat pipe 7 is also in contact with the electromagnet 3 (the covering 34 and the yoke 33). Therefore, a sufficient bonding area between the heat pipe 7 and the electromagnet 3 is ensured. In the example shown in FIG. 3, the heat pipe 7 is attached via the yoke 33, but the yoke 33 may be omitted. Even without the yoke 33, the side surface of the heat absorbing portion 71 of the heat pipe 7 is in contact with the covering 34, so that a contact area necessary for heat conduction can be ensured.

  As shown in FIG. 3, by covering the core 31 and the coil 32 of the electromagnet 3 with the covering 34, not only the contact area with the heat pipe 7 is easily increased, but also the heat generated in the coil 32 is generated. It can be conducted directly by the coating 34. That is, since the outer surface of the coil 32 is formed by winding an electric wire having a circular cross section, the mountain-shaped surface has a continuous shape, and even if the heat pipe 7 is directly contacted, it is sufficient. The contact area cannot be obtained. However, since the covering 34 is filled up to the gap of the coil 32 when covered with the covering 34 such as resin, contact with the coil 32 is completely obtained. As a result, the heat generated in the coil 32 can be directly transferred to the heat pipe 7 via the covering 34 without passing through the core 31. Therefore, the heat dissipation effect is greatly improved. In this case, it is considered that the heat generated in the coil 32 or the like is covered with the covering 34 and is not directly radiated, so that the heat is likely to be trapped. However, since the electromagnet 3 is originally disposed inside the vacuum chamber 8, it is difficult to expect heat dissipation by convection, and it is considered that the heat dissipation effect by conduction of the covering 34 is greater.

(Embodiment 3)
FIG. 4 is a diagram showing the third embodiment. In the configuration of the third embodiment, a concave portion 31a matching the thickness and shape of the heat pipe 7 is formed at one end of the core 31, and the heat absorbing portion 71 of the heat pipe 7 is embedded in the concave portion 31a. . With this structure, the area of the end of the heat pipe 7 is smaller than the outer periphery of the core 31, that is, the inner diameter of the coil 32. However, the heat absorption part 71 of the heat pipe 7 is embedded in the core 31. Therefore, the side surface of the heat pipe 7 also has a contact area, and the contact area can be made larger than the cross-sectional area of the core 31.

The depth d of the recess 31a is preferably as large as possible from the viewpoint of increasing the contact area. However, if it is too deep, the magnetic resistance of the magnetic field lines passing through the inside will increase. Therefore, as described above, the contact area between the electromagnet 3 and the heat pipe 7 is formed to a depth d such that the cross-sectional area of the core 31 is larger. Specifically, if the radius of the end face of the heat absorbing portion 71 of the heat pipe 7 is r and the radius of the cross-sectional area of the core 31 is R, the contact area S1 between them is S1 = πr ² + 2πrd, The area, that is, the cross-sectional area of the inner diameter of the coil 32 is S2 = πR ² . Therefore, to satisfy S1 ≧ S2, (πr ² + 2πrd) ≧ πR ² . That is, d ≧ (R ² −r ² ) / 2r.

  The same applies to the example shown in FIG. 1, but in this case as well, it is preferable that the contact between the heat pipe 7 and the electromagnet 3 (core 31) is particularly good. Therefore, it is preferable to use an adhesive with good thermal conductivity in the recess 31a or adhesion by soldering or brazing. In addition, it is important that heat from the core 31 and the like is conducted to the heat pipe 7. Therefore, it is preferable to form a coating 31b such as copper plating having good thermal conductivity. The formation of the coating 31b having a thermal conductivity higher than that of the core 31 is not limited to the example shown in FIG. 4, and the same applies to other embodiments. Even if the coating 31 b is not formed on the entire surface of the core 31 or the like, it is effective if it is formed at least in the vicinity of the portion to be joined to the heat pipe 7.

(Embodiment 4)
5A to 5B are diagrams for explaining the fourth embodiment. That is, FIG. 5A is a side view, and FIG. 5B is a VB-VB sectional view thereof. In this example, the heat pipe 7 is thinned and embedded in the core 31. That is, if the cross-sectional area is reduced, adverse effects on the magnetic field lines can be suppressed. And by making the heat absorption part 71 of the heat pipe 7 long and embedded deeply in the core 31, the contact area between the heat pipe 7 and the core 31, that is, the electromagnet 3, can be sufficiently increased. Therefore, the temperature of the core 31 can be efficiently lowered while suppressing the influence on the lines of magnetic force by being embedded in the core 31 as the thin heat pipe 7.

  As a method of embedding the heat pipe 7 in the core 31, a hole having a thickness of the heat pipe 7 is formed in the core 31, and the heat absorbing portion 71 of the heat pipe 7 is inserted, and bonded with an adhesive having a high thermal conductivity. Alternatively, as described above, it may be bonded by soldering, brazing, or the like. Alternatively, the heat pipe 7 may be inserted into a hole formed in the core 31, and the gap between the two may be eliminated with a resin containing fine powder having a high thermal conductivity such as carbon nanotube. By doing so, the heat conduction from the core 31 to the heat pipe 7 is improved. As another method, a so-called pressure is applied in which sintering iron powder is placed in a molding die having a recess having a desired core 31 shape, and the heat pipe 7 is embedded therein and pressed to sinter the powder. The heat pipe 7 can be embedded in the core 31 also by using a method of forming a powder magnetic core.

  By adopting such a structure, it is possible to embed the heat pipe 7 to a sufficient depth inside the core 31 without significantly affecting the lines of magnetic force. That is, the contact area between the heat pipe 7 and the core 31 can be increased without significantly reducing the cross-sectional area of the core 31. Furthermore, by inserting the heat pipe 7 deep into the core 31, the temperature of the surface of the electromagnet 3 facing the vapor deposition mask 1 is likely to be lowered. That is, as described above, there is no space for inserting a normal rod-shaped heat pipe 7 between the electromagnet 3 and the vapor deposition mask 1 because the distance needs to be reduced. Therefore, the heat pipe 7 is inserted into or contacted with the core 31 from the surface opposite to the surface facing the vapor deposition mask 1 of the electromagnet 3. As a result, the core 31 is also cooled from the surface opposite to the surface of the electromagnet 3 facing the vapor deposition mask 1. However, according to the present embodiment, the surface of the core 31 facing the vapor deposition mask 1 can be approached as much as possible. It is also possible for the heat pipe 7 to penetrate the core 31 and be exposed on the front surface of the electromagnet 3 (the surface facing the vapor deposition mask 1). In short, the surface of the electromagnet 3 facing the vapor deposition mask 1 to be cooled most can be efficiently cooled.

(Embodiment 5)
6A to 6D are diagrams for explaining the fifth embodiment. That is, in the fifth embodiment, the heat pipe 7 is formed in a flat shape, rounded and embedded in the core 31. 6A shows a plan view of the heat pipe 7 and FIG. 6B shows a VIB-VIB cross-sectional view thereof. In the fifth embodiment, the heat pipe 7 has a flat (flat plate) cylindrical shape. Is formed. Even in this rectangular parallelepiped shape, one end portion is a heat absorbing portion 71 and the other end portion is a heat radiating portion 72. This heat pipe 7 is different in that it is not a round bar shape as shown in FIG. 2A but a flat shape, but the point that a wick 76 is formed on the inner surface of a container (pipe) 75 is the same, The function is the same. As described above, the wick 76 does not have to be formed if the heat absorbing portion 71 is formed vertically downward and the heat radiating portion 72 is formed vertically upward. The container 75 is formed of a flexible material that does not deform even when the inside is at a low pressure. For example, a thin copper plate or stainless steel plate having a thickness of about 0.1 to 0.5 mm can be used.

  The reason for the flexibility is to round as shown in perspective view in FIG. 6C. By rounding as shown in FIG. 6C, the reduction in the cross-sectional area of the core 31 can be minimized even when embedded in the core 31 as schematically shown in FIG. 6D. That is, the influence on the magnetic field can be minimized. Since it is schematically shown in FIG. 6D, the heat pipe 7 is inserted only in the upper part of the core 31. However, the heat pipe 7 can be inserted to the lower end of the core 31 (the front surface of the electromagnet 3) or the vicinity thereof. In FIG. 6C, the rounded shape does not have to be a clean cylindrical shape, and may be a square shape or an indefinite shape. Moreover, although the rounded edge parts may be joined, it is not necessary to join and there may be a clearance gap. Reference numeral 74 denotes a sealing plug made of copper or the like. Since the heat dissipating part 72 is led out of the vacuum chamber 8, it is hermetically sealed so that the vacuum inside the vacuum chamber 8 can be maintained.

  In order to embed such a heat pipe 7 in the core 31, as in the fourth embodiment, a groove is formed in the core 31, and the rolled heat pipe 7 is inserted therein to eliminate the gap. You can also. However, when the shape of the rounded heat pipe 7 cannot be made constant, the configuration of the embodiment 5 can be easily obtained by forming the core 31 by the method of forming the powder magnetic core by compression molding the magnetic powder described above. It is done.

  In the above example, the flat rectangular parallelepiped heat pipe 7 is rounded to form a ring, but it is not necessary to form the ring. For example, a plurality of heat pipes 7 having a shape obtained by cutting the heat pipe 7 shown in FIG. 6A into a strip shape so as to include the heat absorbing portion 71 and the heat radiating portion 72 are formed and individually embedded in the core 31. It may be a structure. By doing so, the heat pipe 7 can be embedded in the core 31 with a small cross-sectional area in accordance with the shape of the core 31 without rounding the heat pipe 7. In this case, since it is necessary to lead out the heat radiating part 72 to the outside of the vacuum chamber 8, it is necessary to use a bellows described later in fixing to the vacuum chamber 8. However, as described later, even when the deposition substrate 2 (see FIG. 1) and the deposition mask 1 (see FIG. 1) are replaced, the electromagnet 3 (see FIG. 1) is fixed. The heat pipe 7 (for example, a portion in the vicinity of the heat radiating portion 72) can be directly fixed to the vacuum chamber 8.

  According to this method, since the heat pipe 7 is formed in a thin flat shape, even if embedded in the core 31, the cross-sectional area in the core 31 is small, and the influence on the lines of magnetic force is very small. Moreover, the influence of the magnetic field lines hardly changes depending on the embedding depth. Therefore, it can be embedded in almost the entire height of the core 31. As a result, the temperature of the surface of the electromagnet 3 facing the vapor deposition mask 1 can be effectively lowered. That is, the heat pipe 7 works very effectively for cooling the electromagnet 3.

(Embodiment 6)
7A to 7D are explanatory views of the sixth embodiment. This embodiment 6 has the same structure as the loop type heat pipe 7 shown on pages 41 to 56 of the aforementioned Thermal Science & Engineering Vol. 2 No. 3 (2015). 7A shows a side view of the loop type heat pipe 7, FIG. 7B shows a plan view of the heat absorbing portion 71, and FIG. 7C shows a structural example of the wick structure 80. That is, as shown in FIG. 7B, a plurality (six in the example shown in FIG. 7B) of wick structures 80 are embedded in a case (container) 81 made of copper or the like. Each wick structure 80 has a wick core 83 at the center and a wick 82 formed in a gear shape around the wick core 83, as shown in FIG. 7C. A groove 84 is formed between 82 and serves as a passage for steam.

  For example, the wick 82 can be formed to a size of about 8 mm × 9 mm (the thickness of the heat absorbing portion 71 can be reduced by crushing the height to form an oval shape). In this case, the groove 84 can be formed to have a depth of 1 mm and a width of about 0.5 mm. The wick 82 and the wick core 83 are made of a porous material such as PTFE (polytetrafluoroethylene). The pores of this porous body can be formed with an average radius of about 5 μm and a porosity of about 35%. In such a wick 82, the groove 84 is integrally formed by forming powdery PTFE by molding, for example.

  7A-7B, 86 is a steam collecting part, 87 is a steam pipe, 88 is a liquid pipe, 89 is a liquid reservoir tank, 90 is a connection pipe, and 85 is a liquid distribution part. The basic operation is the same as that of the heat pipe 7 shown in FIG. 2A described above, but in this apparatus, liquid is sucked by the capillarity of each wick core 83 by the liquid distributor 85, and the wick core 83 wicks 82. Evaporates by heat from the case 81. The evaporated vapor passes through the space defined by the groove 84 and proceeds to the vapor collecting portion 86. As shown in FIG. 7A, the groove 84 is sealed between the liquid distributor 85 and the liquid distributor 85 by the wick 82, while penetrating the vapor collecting portion 86. For this reason, when the pressure in the groove 84 increases due to the evaporation of the liquid, the vapor proceeds toward the vapor collecting portion 86. Then, the vapor is liquefied by being cooled by the heat radiating portion 72 through the vapor pipe 87, and the liquid is accumulated in the liquid reservoir tank 89 through the liquid pipe 88. The liquid accumulated in the liquid reservoir tank 89 returns to the liquid distributor 85 via the connection pipe 90 due to gravity. As the vapor in the heat radiating portion 72 is liquefied, the pressure in the case 81 is lowered, further evaporating in the heat absorbing portion (evaporating portion) 71, and the above-described process is repeated. By forming the heat absorption part (evaporation part) 71 in such a structure, it is possible to cool over a wide area.

  By using such a loop type heat pipe 7, for example, as shown in FIG. 7D, it can be provided as it is on the front surface of the electromagnet 3 (the surface facing the vapor deposition mask 1). In the example shown in FIG. 7D, the heat absorption part 71 of the heat pipe 7 is provided instead of the touch plate 4 of the vapor deposition apparatus shown in FIG. 1, but the conventional touch plate 4 is left as it is, and the touch plate 4 is used. And the electromagnet 3 may be inserted. With such a structure, the surface of the electromagnet 3 facing the vapor deposition mask 1 is cooled, so that it is most suitable for suppressing the temperature rise of the vapor deposition mask 1. In FIG. 7D, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be substituted with the description of the next FIG. Reference numeral 91 denotes a heat sink. That is, the heat radiation part 72 can be cooled by air cooling or the like.

  In addition, since the heat absorption part 71 is disposed horizontally in the loop heat pipe 7, a wick 82 is required inside. However, since the connecting pipe 90 extending from the liquid reservoir tank 89 to the liquid distributor 85 is vertically arranged, it falls by its own weight even if there is no wick. As a result, heat transfer is performed between the evaporation part (heat absorption part 71) and the heat dissipation part 72 by circulation of liquid and vapor. And the temperature rise of the to-be-deposited substrate 2 and the vapor deposition mask 1 is suppressed efficiently.

(Schematic configuration of vapor deposition equipment)
The vapor deposition apparatus according to an embodiment of the present invention is shown in FIG. 1, and as described above, the mask holder 15 is arranged so that the vapor deposition mask 1 and the vapor deposition substrate 2 are disposed in the vicinity of the vacuum chamber 8. And the substrate holder 29 are provided so as to move up and down. The substrate holder 29 is connected to a driving device (not shown) so that the peripheral portion of the deposition target substrate 2 is held by a plurality of hook-shaped arms and can be moved up and down. In the case of replacement of the deposition target substrate 2 or the like, the deposition target substrate 2 carried into the vacuum chamber 8 by the robot arm is received by the hook-shaped arm, and the substrate holder 29 until the deposition target substrate 2 comes close to the deposition mask 1. Descends. An imaging device (not shown) is also provided so that alignment can be performed. The touch plate 4 is supported by a support frame 41 and is connected via a support frame 41 to a driving device that lowers the touch plate 4 until it comes into contact with the deposition target substrate 2. By lowering the touch plate 4, the deposition target substrate 2 is flattened.

  The vapor deposition apparatus captures the vapor deposition substrate 2 while imaging the alignment marks formed on the vapor deposition mask 1 and the vapor deposition substrate 2 when aligning the vapor deposition mask 1 and the vapor deposition substrate 2 of this embodiment. A fine movement device that moves relative to the vapor deposition mask 1 is also provided. The alignment is performed in a state where energization of the electromagnet 3 is stopped so that the vapor deposition mask 1 is not unnecessarily attracted by the electromagnet 3. Thereafter, the electromagnet 3 held by the touch plate 4 or a similar holder (not shown) is lowered and a current flows, whereby the deposition mask 1 is attracted toward the deposition target substrate 2.

  In the present embodiment, the heat pipe 7 is provided in close contact with the yoke 33 of the electromagnet 3. As described above, the heat absorbing portion 71 of the heat pipe 7 is in close contact with the electromagnet 3 with a cross-sectional area of the inner diameter of the coil 32, preferably larger than that, and the heat radiating portion 72 at the other end is outside the vacuum chamber 8. Has been derived. The heat dissipating part 72 is placed in, for example, an exhaust heat tank 95 so that cooling such as air cooling or water cooling can be performed. As described above, in the heat pipe 7, the heat absorbing portion 71 at one end portion exists inside the vacuum chamber 8, and the heat radiating portion 72 at the other end portion exists outside the vacuum chamber 8. As described above, when the deposition target substrate 2 or the deposition mask 1 is replaced, the electromagnet 3 or the like needs to be lifted upward and lowered again after replacement. Therefore, the heat pipe 7 cannot be directly fixed to the wall surface of the vacuum chamber 8. In such a case, as shown in FIG. 8, it is preferably fixed to the vacuum chamber 8 via a bellows 96. The distance by which the electromagnet 3 and the like are lifted when the deposition target substrate 2 and the like are exchanged is about 100 mm or less and may be any bellows 96 that can be expanded and contracted to that extent.

  However, the electromagnet 3 and the touch plate 4 may have a fixed structure, and the deposition mask 1 and the deposition target substrate 2 may be lowered to replace the deposition target substrate 2, and then lifted and placed at a predetermined position. . With such a structure, the heat pipe 7 can be directly bonded to the vacuum chamber 8 and sealed without using the bellows 96. When the bellows 96 is used, if the bellows 96 is damaged, the inside of the vacuum chamber 8 is exposed to the atmosphere and the inner wall becomes dirty. If the inner wall of the vacuum chamber 8 becomes dirty, it becomes a gas source, and thus cleaning is necessary. Therefore, a double structure is preferable. For example, in the structure shown in FIG. 1, it is preferable to cover the outer wall of the heat exhaust tank 95 and the outer wall of the vacuum chamber 8 with a cover (not shown) so as to include the bellows 96. In this case, the connection between the heat pipe 7 and the exhaust heat tank 95 and between the exhaust heat tank 95 of the covering cover and the vacuum chamber 8 is hermetically sealed, and the covering cover is flexible or bellows. What has is preferable. This is because the exhaust heat tank 95 can be moved by the movement of the electromagnet 3. Since the inside of the vacuum chamber 8 is evacuated, an exhaust device (not shown) is connected.

  As described above, various electromagnets such as those having the core 31, those having the yoke 33, and those having the covering 34 can be used. The core 31 may be square or circular. For example, when the size of the vapor deposition mask 1 is about 1.5 m × 1.8 m, the electromagnet 3 having the core 31 whose cross section of the unit electromagnet shown in FIG. As shown in FIG. 1, a plurality of (each electromagnet is referred to as a unit electromagnet) can be arranged in accordance with the size of the vapor deposition mask 1 (in FIG. 1, the horizontal direction is reduced and the number of unit electromagnets is reduced. ) In the example shown in FIG. 1, the connection of the coil 32 is not shown, but the coil 32 wound around each core 31 is connected in series. However, the coils 32 of the respective unit electromagnets may be connected in parallel. Several units may be connected in series. A current may be applied independently to a part of the unit electromagnet. The electromagnet 3 is cooled by the method of each embodiment described above.

  As shown in FIG. 9, the vapor deposition mask 1 includes a resin film 11, a metal support layer 12, and a frame (frame body) 14 formed around the resin film 11, and the vapor deposition mask 1 is shown in FIG. 1. Thus, the frame 14 is placed on the mask holder 15. A magnetic material is used for the metal support layer 12. As a result, an attractive force acts between the core 31 of the electromagnet 3 and is attracted by sandwiching the deposition target substrate 2. The metal support layer 12 may be made of a ferromagnetic material. In this case, the metal support layer 12 is magnetized (a state in which strong magnetization remains even when the external magnetic field is removed) by the strong magnetic field of the electromagnet 3. When such a ferromagnetic material is used, when the electromagnet 3 and the vapor deposition mask 1 are separated, it is easier to separate the electromagnet 3 by applying a current in the opposite direction. Even when such a strong magnetic field for magnetization is generated, heating of the electromagnet 3 is suppressed by the present embodiment.

  As the metal support layer 12, for example, Fe, Co, Ni, Mn, or an alloy thereof can be used. Among them, invar (Fe and Ni alloy) is particularly preferable because of a small difference in linear expansion coefficient from the deposition target substrate 2 and almost no expansion due to heat. The metal support layer 12 has a thickness of about 5 μm to 30 μm.

  In FIG. 9, the opening 11a of the resin film 11 and the opening 12a of the metal support layer 12 are tapered so that they taper toward the deposition target substrate 2 (see FIG. 1). The reason is that when the vapor deposition material 51 (see FIG. 1) is vapor deposited, it does not become a shadow of the vapor deposition material 51 that scatters. In addition, the vapor deposition source 5 can use various vapor deposition sources 5, such as dot shape, line shape, and planar shape. For example, a line-type vapor deposition source 5 (extending in a direction perpendicular to the paper surface of FIG. 1) in which crucibles are arranged in a line is scanned from the left end to the right end of the paper surface, for example, so that the entire surface of the evaporation target substrate 2 is obtained. Vapor deposition is performed. Therefore, the vapor deposition material 51 is scattered from various directions, and the above-described taper is formed so that the vapor deposition material 51 coming from an oblique direction can reach the vapor deposition substrate 2 without being blocked.

(Vapor deposition method)
Next, the vapor deposition method by 2nd embodiment of this invention is demonstrated. In the vapor deposition method according to the second embodiment of the present invention, as shown in FIG. 1 described above, the electromagnet 3, the vapor deposition substrate 2, and the vapor deposition mask 1 having a magnetic material are superposed, and the electromagnet 3 is formed. The process of adsorbing the vapor deposition mask 1 to the vapor deposition target substrate 2 by energization of and the step of depositing the vapor deposition material 51 on the vapor deposition target substrate 2 by the scattering of the vapor deposition material 51 from the vapor deposition source 5 arranged away from the vapor deposition mask 1. The vapor deposition material 51 is deposited while the electromagnet 3 is cooled by the heat pipe 7 in close contact with the electromagnet 3 in an area larger than the cross-sectional area of the inner periphery of the coil 32 of the electromagnet 3.

  As described above, the deposition target substrate 2 is overlaid on the deposition mask 1. The alignment between the deposition substrate 2 and the deposition mask 1 is performed as follows. This is performed by moving the deposition target substrate 2 relative to the deposition mask 1 while observing alignment marks formed on the deposition target substrate 2 and the deposition mask 1 with an imaging device. At this time, as described above, if the electromagnet 3 is not operated, the deposition substrate 2 and the deposition mask 1 can be brought close to each other. By this method, the opening 11a of the vapor deposition mask 1 and the vapor deposition location (for example, the pattern of the first electrode 22 of the support substrate 21 in the case of an organic EL display device described later) can be matched. After the alignment, the electromagnet 3 is operated. As a result, a strong attractive force acts between the electromagnet 3 and the vapor deposition mask 1 so that the vapor deposition target substrate 2 and the vapor deposition mask 1 are brought close to each other. At this time, heat is generated by passing a current through the coil 32 of the electromagnet 3, but as described above, the heat pipe 7 is connected to the electromagnet 3. There is almost no heat conduction to 1, and the temperature rise of the vapor deposition mask 1 is suppressed.

  After that, as shown in FIG. 1, the vapor deposition material 51 is deposited on the vapor deposition target substrate 2 by scattering (vaporization or sublimation) of the vapor deposition material 51 from the vapor deposition source 5 that is disposed apart from the vapor deposition mask 1. Specifically, as described above, a line source such as a crucible arranged in a line is used, but the present invention is not limited to this. For example, when an organic EL display device is manufactured, a plurality of types of vapor deposition masks 1 having openings 11a formed in some pixels are prepared, and the vapor deposition mask 1 is replaced to form an organic layer by a plurality of vapor deposition operations. .

  According to this vapor deposition method, vapor deposition is performed while the electromagnet 3 is cooled by the heat pipe 7. As a result, the relative displacement between the vapor deposition mask 1 and the vapor deposition substrate 2 is suppressed, and vapor deposition with excellent accuracy is performed. In addition, it is preferable from the viewpoint of suppressing the occurrence of electromagnetic induction that the current rises and falls slowly when the current is supplied to the electromagnet 3 and when the current is cut off. For example, a capacitor is connected in parallel with the electromagnet 3, a terminal is provided in the middle of the coil 32, a portion to be energized in the coil 32 is gradually increased, a reverse winding portion is formed in the coil 32, and current is turned on or off Sometimes, it is preferable to turn off the current flowing through the reverse-winding coil gradually after turning on or off the current while canceling the generated magnetic field.

(Method for manufacturing organic EL display device)
Next, a method for manufacturing an organic EL display device using the vapor deposition method of the above embodiment will be described. Since a manufacturing method other than the vapor deposition method can be performed by a well-known method, a method of laminating an organic layer by the vapor deposition method of the present invention will be mainly described with reference to FIGS.

  In the method for manufacturing an organic EL display device according to the third embodiment of the present invention, a TFT, a planarizing film, and a first electrode (for example, an anode) 22 (not shown) are formed on a support substrate 21, and a vapor deposition mask 1 is formed on one surface thereof. In order to deposit the vapor deposition material 51, the organic layer laminated film 25 is formed using the above-described vapor deposition method. A second electrode 26 (see FIG. 11; cathode) is formed on the laminated film 25.

For example, the support substrate 21 such as a glass plate is not completely illustrated, but a driving element such as a TFT is formed for each RGB sub-pixel of each pixel, and the first electrode 22 connected to the driving element is flat. On the conversion film, it is formed by a combination of a metal film such as Ag or APC and an ITO film. As shown in FIGS. 10 to 11, insulating banks 23 made of SiO _2, acrylic resin, polyimide resin, or the like are formed between the sub-pixels. On the insulating bank 23 of the support substrate 21, the above-described vapor deposition mask 1 is aligned and fixed. As shown in FIG. 1, the fixing is performed by using an electromagnet 3 provided via a touch plate 4 on the surface opposite to the deposition surface of the support substrate 21 (deposition substrate 2), for example. Is done. As described above, since the magnetic material is used for the metal support layer 12 (see FIG. 9) of the vapor deposition mask 1, when the magnetic field is applied by the electromagnet 3, the metal support layer 12 of the vapor deposition mask 1 is magnetized and becomes a core. A suction force is generated between the unit 31 and the unit 31. Even when the electromagnet 3 does not have the core 31, it is attracted by the magnetic field generated by the current flowing through the coil 32. At this time, as described above, the heat generated by the current flow is quickly conducted to the heat radiating portion 72 and dissipated by the heat pipe 7. As a result, even if there is a difference in coefficient of thermal expansion between the vapor deposition mask 1 and the support substrate 21, the mutual displacement is greatly suppressed. A high-definition organic EL display device can be obtained.

  In this state, as shown in FIG. 10, the vapor deposition material 51 is scattered from the vapor deposition source (crucible) 5 in the vapor deposition apparatus, and the vapor deposition material 51 is only on the portion of the support substrate 21 exposed to the opening 11 a of the vapor deposition mask 1. The organic layer laminated film 25 is formed on the first electrode 22 of the desired sub-pixel by vapor deposition. This vapor deposition process may be performed for each sub-pixel by sequentially replacing the vapor deposition mask 1. The vapor deposition mask 1 in which the same material is vapor-deposited simultaneously on a plurality of subpixels may be used. When the vapor deposition mask 1 is replaced, the electromagnet 3 (see FIG. 1) not shown in FIG. 10 is not shown so as to remove the magnetic field on the metal support layer 12 (see FIG. 9) of the vapor deposition mask 1. The power circuit is turned off. Also at this time, the heat pipe 7 is working, and all the heat remaining in the electromagnet 3 is conducted to the heat radiating portion 72.

In FIGS. 10 to 11, the organic layer laminated film 25 is simply shown as one layer, but the organic layer laminated film 25 may be formed of a plurality of laminated films 25 made of different materials. For example, as a layer in contact with the anode 22, a hole injection layer made of a material with good ionization energy consistency that improves hole injection may be provided. On this hole injection layer, a hole transport layer capable of improving the stable transport of holes and confining electrons (energy barrier) in the light emitting layer is formed of, for example, an amine material. Further, a light emitting layer selected on the basis of the light emission wavelength is formed by doping Alq ₃ with red or green organic fluorescent material for red, green, for example. As the blue material, a DSA organic material is used. On the light emitting layer, an electron transport layer that further improves the electron injection property and stably transports electrons is formed of Alq ₃ or the like. By laminating each of these layers by several tens of nanometers, an organic layer laminated film 25 is formed. An electron injection layer that improves electron injection properties such as LiF and Liq may be provided between the organic layer and the metal electrode. In the present embodiment, these are included in the organic layer laminated film 25.

  In the organic layer laminated film 25, the light emitting layer is deposited with an organic layer of a material corresponding to each color of RGB. In addition, the hole transport layer, the electron transport layer, and the like are preferably deposited separately using a material suitable for the light emitting layer if the light emitting performance is important. However, in consideration of the material cost, there are cases where two or three colors of RGB are laminated with the same material. In the case where materials common to subpixels of two or more colors are stacked, the vapor deposition mask 1 in which the opening 11a is formed in the common subpixel is formed. In the case where the vapor deposition layers are different in individual sub-pixels, for example, each organic layer can be vapor-deposited continuously using one vapor deposition mask 1 in the R sub-pixels. Further, when a common organic layer is deposited in RGB, the organic layer of each subpixel is evaporated to the lower side of the common layer, and an opening 11a is formed in RGB at the common organic layer. Using the vapor deposition mask 1, the organic layers of all the pixels are vapor-deposited at once. In the case of mass production, a number of vacuum chambers 8 of the vapor deposition apparatus are arranged, different vapor deposition masks 1 are attached to each, and the support substrate 21 (vapor deposition substrate 2) moves through each vapor deposition apparatus. Further, the vapor deposition may be performed continuously.

When the formation of the laminated film 25 of all organic layers including the electron injection layer such as the LiF layer is completed, the electromagnet 3 is turned off and the electromagnet 3 is separated from the vapor deposition mask 1 as described above. Thereafter, a second electrode (for example, a cathode) 26 is formed on the entire surface. The example shown in FIG. 11 is a top emission type and emits light from the surface opposite to the support substrate 21 in the figure. Therefore, the second electrode 26 is made of a translucent material, for example, a thin film of Mg—Ag. It is formed by a eutectic film. In addition, Al or the like can be used. In the case of a bottom emission type in which light is radiated through the support substrate 21, ITO, In ₃ O ₄ or the like is used for the first electrode 22, and the second electrode 26 includes a metal having a low work function, For example, Mg, K, Li, Al, etc. can be used. A protective film 27 made of, for example, Si ₃ N ₄ is formed on the surface of the second electrode 26. The entirety is sealed by a sealing layer made of glass, moisture-resistant resin film, or the like (not shown), and the organic layer laminated film 25 is configured not to absorb moisture. Further, the organic layer can be made as common as possible and a color filter can be provided on the surface thereof.

(Summary)
(1) The vapor deposition apparatus which concerns on 1st embodiment of this invention is in contact with the vacuum chamber, the mask holder holding the vapor deposition mask arrange | positioned inside the said vacuum chamber, and the vapor deposition mask hold | maintained at the said mask holder. A substrate holder for holding the deposition substrate, an electromagnet disposed on the opposite side of the deposition mask of the deposition substrate held by the substrate holder, and a deposition material provided facing the deposition mask. A vapor deposition source for vaporizing or sublimating, and at least a heat absorbing portion which is a first end portion are provided in contact with the electromagnet, and a heat radiating portion which is a second end portion opposite to the first end portion is provided outside the vacuum chamber. A contact portion between the heat pipe and the electromagnet is closely contacted and bonded in an area larger than the cross-sectional area of the inner periphery of the coil of the electromagnet. That.

  According to the vapor deposition apparatus of one embodiment of the present invention, the heat absorption part of the heat pipe is provided so as to be in contact with the electromagnet of the vapor deposition apparatus in an area equal to or larger than the cross-sectional area of the inner periphery of the coil of the electromagnet. As a result, the heat generated by the electromagnet can be quickly dissipated. That is, even if the heat absorption part of the heat pipe contacts the surface opposite to the surface facing the vapor deposition mask of the electromagnet, heat dissipation of the entire electromagnet is achieved by contacting the electromagnet in a wide range of the heat absorption part of the heat pipe. As a result, it is possible to suppress the heat from the electromagnet from being transmitted to the deposition target substrate or the deposition mask to raise the temperature of the deposition target substrate or the deposition mask. And since the position shift by the temperature rise of a vapor deposition substrate and a vapor deposition mask is suppressed, vapor deposition material is vapor-deposited with the exact pattern on the exact location of a vapor deposition substrate. Therefore, a fine display panel can be obtained.

  (2) It is preferable that the electromagnet and the heat pipe are in contact so that the temperature rise of the vapor deposition mask by the electromagnet is 10 ° C. or less. That is, as the contact area between the heat absorption part of the heat pipe and the electromagnet increases, the temperature rise of the electromagnet is suppressed, and the temperature rise of the deposition target substrate and the deposition mask is suppressed.

  (3) The electromagnet has a columnar core, and a yoke is attached to one end of the core, so that a cross-sectional shape including the core is formed in an E-shaped yoke, and the heat is applied to the E-shaped yoke. The pipes are preferably in close contact. By providing the yoke, the magnetic field in the vicinity of the vapor deposition mask can be strengthened, and the contact area of the heat absorption part of the heat pipe with the electromagnet (yoke) can be increased.

  (4) The electromagnet includes a columnar core and a covering that integrates a coil formed by winding an electric wire around the core, and the heat absorbing portion of the heat pipe is in close contact with the covering. It is preferable to be formed. When covered with a covering, heat dissipation due to radiation is limited, but since it is originally placed in a vacuum atmosphere, the effect of heat dissipation due to radiation is small. On the other hand, heat transfer due to conduction is obtained by being covered with the covering, and the heat absorbing portion of the heat pipe is embedded in the covering, so that the effect of heat release can be obtained very efficiently. In this case, the covering is preferably a material having a high thermal conductivity. Moreover, since it coat | covers with such a coating | cover, it fully contacts with the circumference | surroundings of the electric wire (coil) which is easy to generate | occur | produce heat most, Therefore The heat dissipation effect by heat conduction is especially large.

  (5) It is preferable that the electromagnet has a columnar core, and the heat absorbing portion of the heat pipe is embedded in the core to a depth of ½ or more of the length of the core. Of the electromagnets, it is most preferable that the temperature rise of the surface (front surface) facing the deposition substrate is suppressed. However, due to space limitations, there are many cases in which contact with the back surface, which is the surface opposite to the front surface of the electromagnet, is unavoidable. Even in that case, the temperature of the front surface of the electromagnet can be lowered by embedding the heat pipe to a depth of more than half of the core. The embedding depth is preferably as deep as possible, and more preferably 2/3 or more, or more preferably exposed to the front surface of the core.

  (6) The heat pipe is formed in a flat shape, the heat pipe is rounded into a ring shape and formed into a cylindrical body, and the heat absorbing portion of the cylindrical body is embedded in the core. preferable. An electromagnet has a stronger magnetic field when it has a core than an air core. Therefore, it is not preferable to make a hole in the core from the viewpoint of the magnetic field. However, if the hole is along the axial direction, the influence on the magnetic field does not change much even if it is shallow or deep. Therefore, it is preferable to insert the heat absorbing portion of the heat pipe into a deep hole with a small cross-sectional area because heat release can be increased without weakening the magnetic field.

  (7) It is preferable that the electromagnet has a columnar core, and a film having a higher thermal conductivity than the core is formed at least in the vicinity of the contact portion of the electromagnet with the heat pipe. As described above, it is difficult to provide the heat pipe on the front surface of the electromagnet because of space, and it is often in contact with the back surface. However, the heat conduction of iron forming the core is not so good. Therefore, in order to improve the heat conduction of the core, it is preferable to form a film excellent in heat conduction such as copper plating. The coating is preferably formed on the entire surface including the concave portion of the core (including the yoke if the yoke is provided). It is considered that heat conduction from the core to the heat pipe is improved by forming a film at least in a contact portion with the heat absorbing portion of the heat pipe.

  (8) It is preferable that the heat absorption part of the heat pipe is formed in a planar shape, and the heat absorption part of the heat pipe is disposed in close contact with a surface of the electromagnet facing the vapor deposition mask. According to this structure, since the heat pipe has a special structure, only the heat absorbing portion of the heat pipe can be in contact with the front surface of the electromagnet. As a result, the surface of the electromagnet facing the vapor deposition mask can be cooled, which is very preferable.

  (9) The heat pipe is connected to the vacuum chamber via a bellows. By doing so, the electromagnet can be lifted and lowered together with the substrate holder or the like.

  (10) A second chamber that covers the vacuum chamber is formed on an outer periphery of the vacuum chamber, and a space between the vacuum chamber and the second chamber is a vacuum lower than a degree of vacuum inside the vacuum chamber. Preferably. Even if the bellows is broken, the inside of the vacuum chamber can be suppressed from being contaminated with the atmosphere.

  (11) It is preferable that a protective pipe for preventing leakage of liquid inside due to breakage of the heat pipe is formed on the outer periphery of the heat pipe. Even if the heat pipe is broken, the inside of the vacuum chamber can be prevented from being contaminated with the liquid sealed in the heat pipe.

  (12) Further, in the vapor deposition method according to the second embodiment of the present invention, an electromagnet, a vapor deposition substrate, and a vapor deposition mask having a magnetic material are superposed, and the electromagnet is energized to the vapor deposition substrate. Adhering the vapor deposition mask, and depositing the vapor deposition material on the vapor deposition substrate by scattering of the vapor deposition material from a vapor deposition source disposed away from the vapor deposition mask, The vapor deposition material is deposited while the electromagnet is cooled by a heat pipe that is in close contact with the electromagnet in an area wider than the circumferential cross-sectional area.

  According to the vapor deposition method of the second embodiment of the present invention, the heat pipe is brought into close contact with the electromagnet in an area larger than the cross-sectional area of the inner circumference of the coil of the electromagnet. Even if it does, the temperature rise of an electromagnet is suppressed. As a result, the temperature rise of a vapor deposition substrate and a vapor deposition mask is also suppressed. As a result, misalignment between the deposition target substrate and the deposition mask due to thermal expansion is suppressed, and accurate deposition can be performed.

  (13) It is preferable to cool the electromagnet so that the temperature rise of the vapor deposition mask by the electromagnet is 10 ° C. or less. The temperature rise of the electromagnet is suppressed, and as a result, the temperature rise of the vapor deposition mask is suppressed to 10 ° C. or less, so that the deviation of the laminated film of the vapor deposition material with respect to the pixel is suppressed to an allowable range, and a highly accurate vapor deposition film is obtained. .

  (14) Furthermore, in the method for manufacturing an organic EL display device according to the third embodiment of the present invention, at least a TFT and a first electrode are formed on a support substrate, and the above (12) to (13) are formed on the support substrate. Forming a laminated film of an organic layer by vapor-depositing an organic material using any one of the vapor deposition methods, and forming a second electrode on the laminated film.

  According to the method of manufacturing the organic EL display device of the third embodiment of the present invention, when the organic EL display device is manufactured, radiation of heat from the electromagnet is suppressed. Is suppressed, and a display panel with a highly delicate pattern can be obtained.

DESCRIPTION OF SYMBOLS 1 Deposition mask 2 Substrate to be deposited 3 Electromagnet 4 Touch plate 5 Deposition source 7 Heat pipe 8 Vacuum chamber 12 Metal support layer 15 Mask holder 21 Support substrate 22 First electrode 23 Insulation bank 25 Multilayer film 26 Second electrode 29 Substrate holder 31 Core (core)
31b Coating 32 Coil 33 Yoke 34 Cover 41 Support frame 51 Vapor deposition material 71 Heat absorption part 72 Heat radiation part 73 Space part 78 Protective pipe 80 Wick structure 81 Case (container)
82 Wick 83 Wick Core 84 Groove 96 Bellows

Claims (16)

A vacuum chamber;
A mask holder for holding a vapor deposition mask disposed inside the vacuum chamber;
A substrate holder for holding a vapor deposition substrate so as to be in contact with a vapor deposition mask held by the mask holder;
An electromagnet disposed above the surface opposite to the vapor deposition mask of the vapor deposition substrate held by the substrate holder;
A vapor deposition source provided opposite to the vapor deposition mask and vaporizing or sublimating the vapor deposition material;
A heat pipe having at least a heat absorption part as a first end part in contact with the electromagnet, and a heat dissipation part as a second end part opposite to the first end part, which is led out of the vacuum chamber;
A vapor deposition apparatus comprising:   The heat pipe is a loop type heat pipe having a space between the heat absorption part, a steam pipe connecting each one end of the heat radiating part, and a connection connecting each other end of the heat absorption part and the heat radiating part. The vapor deposition apparatus of Claim 1 which is these.   The vapor deposition apparatus according to claim 2, wherein the heat absorption part of the loop heat pipe is formed in a flat plate shape in which a plurality of wick structures are juxtaposed.   Each of the wick structures has a wick core in the center, a wick is formed around the periphery of the wick structure, and a groove formed between the wicks of the gear-shaped tooth portion is a passage for steam. The vapor deposition apparatus according to claim 3.   The heat absorption part of the heat pipe is disposed at a position directly facing the surface of the electromagnet facing the vapor deposition mask and the deposition target substrate held by the substrate holder, respectively. The vapor deposition apparatus of description. (Instead of touch panel)   The electromagnet includes a core, an electromagnetic coil, and a yoke, and the core, the electromagnetic coil, and the yoke are integrated with a covering, and the heat absorbing portion of the heat pipe is in the covering. The vapor deposition apparatus according to claim 1, which is embedded.   The vapor deposition apparatus according to claim 6, wherein the covering is formed of a heat resistant resin.   The vapor deposition apparatus of Claim 6 or 7 with which the filler containing metal powder is mixed in the said covering.   The vapor deposition apparatus according to claim 1, wherein the electromagnet includes a core, and the heat-absorbing portion of the heat pipe is embedded in a recess formed in one end portion of the core. When the cross-sectional shape of the heat pipe and the core is circular, respectively, the radius of the end face of the heat absorbing portion r, the radius of the cross section of the core R, the depth of the recess and d, d ≧ (R ² - The vapor deposition apparatus according to claim 9, wherein the concave portion is formed so as to be r ² ) / 2r.   A bonding material in which a film made of a material having a higher thermal conductivity than the core is formed on at least a part of the surface of the core and the inner surface of the recess, and the heat absorbing portion has a higher thermal conductivity than the core. The vapor deposition apparatus according to claim 9 or 10, wherein the heat absorbing part is joined in the recess.   The electromagnet includes a core, and a plurality of the heat absorbing portions are embedded in the core by making a cross-sectional area of the heat pipe smaller than a cross-sectional area of the core. Vapor deposition equipment.   The vapor deposition apparatus according to claim 9 or 10, wherein a gap between the heat pipe and the core is filled with a resin containing fine powder having a high thermal conductivity.   The vapor deposition apparatus of Claim 9, 10 or 12 whose said core is a powder magnetic core obtained by baking of the iron powder for sintering.   The vapor deposition apparatus according to claim 1, wherein the heat pipe is formed of a flexible material. Forming at least a TFT and a first electrode on a support substrate;
A laminated film of an organic layer is formed by vapor-depositing an organic material on the support substrate using the vapor deposition apparatus according to any one of claims 1 to 15.
A method of manufacturing an organic EL display device, comprising forming a second electrode on the laminated film.

Images