Patent Publication Number: US-2021193928-A1

Title: Manufacturing method of deposition mask and manufacturing method of organic el display

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application of International Application No. PCT/JP2019/30786, filed on Aug. 5, 2019, which claims the benefit of priority from Japanese Patent Application No. 2018-150805, filed on Aug. 9, 2018. The entire contents of these applications are incorporated herein by reference. 
    
    
     BACKGROUND 
     Field 
     Embodiments of the present disclosure relate to a manufacturing method of a deposition mask and a manufacturing method of an organic EL display. 
     Background Art 
     As a product using organic EL device becomes larger, or as a substrate size becomes larger, the demand for a larger deposition mask has been increasing. Since metal plate is used for manufacturing a deposition mask made of metal, a metal plate also becomes larger. Unfortunately, the current metal processing technology does not readily enable forming an accurate slit in a large metal plate, and cannot produce a high-definition slit. In addition, when a deposition mask is made only of metal, its mass increases as it becomes larger. Thus, the total mass including a frame also increases. As a result, such a deposition mask is difficult to be handled. 
     Under these circumstances, Patent Document 1 proposes a deposition mask including a metal layer provided with slits and a resin mask laminated on a surface of the metal layer. The resin mask has openings arranged in rows and columns corresponding to a pattern to be made by deposition. 
     Patent Document 1: JP5994952B 
     SUMMARY 
     The manufacturing method of the deposition mask described above includes a step of forming the resin layer on a surface of the substrate, and a step of forming the opening in the resin layer. The resin layer is formed by applying a resin solution to the surface of the substrate. The opening is formed by processing the resin layer by, for example, laser processing. When the resin layer is formed by application of a resin solution, strain may occur and remain inside the resin layer. When the opening is formed in the resin layer with residual strain, a position of the opening may change as the strain subsequently relieves. 
     The object of the present disclosure is to provide a manufacturing method of a deposition mask capable of effectively solving such a problem. 
     An embodiment of the present disclosure is: 
     a manufacturing method of a deposition mask comprising: 
     a resin-layer forming step of forming a resin layer on a surface of a substrate by applying a resin solution to the surface of the substrate; 
     a step of forming a non-contact area that is not in contact with the surface of the substrate in the resin layer by removing at least a part of the substrate; 
     a step of bringing the resin layer into contact with a liquid or heating the resin layer after the non-contact area has been formed in the resin layer; and 
     a resin-layer processing step of forming a second opening in the resin layer by processing the resin layer after the step of bringing the resin layer into contact with a liquid or heating the resin layer. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a liquid contacting step of bringing the resin layer into contact with a liquid. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, the liquid contacting step may include an ultrasonically processing step of ultrasonically processing the resin layer. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, the step of bringing the resin layer into contact with a liquid or heating the resin layer may further include a drying step of removing the liquid adhering to the resin layer after the liquid contacting step. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a heating step of heating the resin layer. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, a thickness of the resin layer may be 3 μm or more and 10 μm or less. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, 
     the resin-layer forming step may include a step of preparing a metal plate as the substrate and a step of forming a resin layer on the surface of the metal plate; 
     the step of forming a non-contact area may include a step of forming a first opening in the metal plate by etching the metal plate; and 
     the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a step of bringing the resin layer of a laminate including the metal plate the first opening formed therein and the resin layer laminated to the metal plate into contact with a liquid or heating the resin layer of the laminate. 
     The manufacturing method of a deposition mask according to the embodiment of the present disclosure may further comprise a support fixing step of fixing the laminate to a support in a state where tension is applied to the laminate, and 
     the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a step of bringing the resin layer of the laminate fixed to the support into contact with a liquid or heating the resin layer of the laminate fixed to the support. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, a thickness of the metal plate may be 5 μm or more and 100 μm or less. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, 
     the step of forming a non-contact area may include a step of peeling the resin layer from the substrate; and 
     the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a step of bringing the resin layer peeled from the substrate into contact with a liquid or heating the resin layer peeled from the substrate. 
     The manufacturing method of a deposition mask according to the embodiment of the present disclosure may further comprise a support fixing step of fixing the resin layer to a support, and 
     the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a step of bringing the resin layer fixed to the support into contact with a liquid or heating the resin layer fixed to the support. 
     The manufacturing method of a deposition mask according to the embodiment of the present disclosure may comprise a step of forming a laminate by partially forming a metal layer on the resin layer by a plating process after the resin-layer forming step; and 
     the step of forming a non-contact area may include a step of bringing the resin layer of the laminate into contact with a liquid or heating the resin layer of the laminate. 
     The manufacturing method of a deposition mask according to the embodiment of the present disclosure may further comprise a support fixing step of fixing the laminate to a support, and 
     the step of bringing the resin layer into contact with a liquid or heating the resin layer may include a step of bringing the resin layer of the laminate fixed to the support into contact with a liquid or heating the resin layer of the laminate fixed to the support. 
     In the manufacturing method of a deposition mask according to the embodiment of the present disclosure, a thickness of the metal layer may be 1 μm or more and 50 μm or less. 
     Another embodiment of the present disclosure is a manufacturing method of an organic EL display comprising: 
     a step of preparing a deposition mask manufactured by the manufacturing method of a deposition mask above described; 
     a step of assembling the deposition mask and a substrate to be deposited such that the resin layer of the deposition mask faces the substrate to be deposited; and 
     a deposition step of depositing a deposition material to the substrate to be deposited through the second opening of the resin layer of the deposition mask. 
     The manufacturing method of an organic EL display according to the embodiment of the present disclosure may comprise a step of washing the deposition mask after the deposition step. 
     In the manufacturing method of an organic EL display according to the embodiment of the present disclosure, the step of washing the deposition mask may include a step of immersing the deposition mask in a washing liquid. 
     In the manufacturing method of an organic EL display according to the embodiment of the present disclosure, the step of washing the deposition mask may include a step of generating ultrasonic waves in the washing liquid. 
     The embodiments of this disclosure can suppress the change in positions of the openings in the resin layer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view showing a deposition mask according to a first embodiment. 
         FIG. 2  is a sectional view of the deposition mask of  FIG. 1 , taken along a line II-II. 
         FIGS. 3 a -3 e    are views showing a step of forming an intermediate having a resin layer including a non-contact area in a manufacturing method of a deposition mask according to the first embodiment. 
         FIG. 4  is a view showing an example of a relieving step. 
         FIG. 5  is a view showing an example of the relieving step. 
         FIGS. 6 a -6 b    are views showing a step of forming second openings in the resin layer. 
         FIG. 7  is a schematic view showing a deposition apparatus. 
         FIG. 8  is a schematic view showing an organic EL display made by using the deposition mask. 
         FIGS. 9 a -9 c    are schematic views showing a manufacturing method of an organic EL display by using the deposition mask. 
         FIG. 10  is a view showing a modification example of the relieving step. 
         FIG. 11  is a view showing a modification example of the relieving step. 
         FIG. 12  is a sectional view of a deposition mask according to a second embodiment. 
         FIGS. 13 a -13 d    are views showing a step of forming an intermediate having a resin layer including a non-contact area in a manufacturing method of a deposition mask according to the second embodiment. 
         FIG. 14  is a sectional view of a deposition mask according to a third embodiment. 
         FIGS. 15 a -15 f    are views showing a step of forming an intermediate having a resin layer including a non-contact area in a manufacturing method of a deposition mask according to the third embodiment. 
         FIGS. 16 a -16 b    are views showing a step of forming second opening in a resin layer. 
         FIGS. 17 a -17 g    are views showing a step of forming an intermediate having a resin layer including a non-contact area in a manufacturing method of a deposition mask according to a modification example of the third embodiment. 
         FIG. 18  is a view showing a method of measuring positions of the second openings in Examples. 
         FIG. 19  is a view showing measuring results of amounts of change in the positions of the second openings before and after washing, in an Example 1 and a Comparative Example 1. 
         FIG. 20  is a view showing measuring results of amounts of change in the positions of the second opening before and after washing, in an Example 2 and a Comparative Example 2. 
     
    
    
     DETAILED DESCRIPTION 
     A structure of a mask according to one embodiment and its manufacturing method are described in detail hereafter with reference to the drawings. Embodiments shown hereafter are examples of embodiments of the present disclosure and the present disclosure should not be limited to these embodiments. In this specification, terms such as “plate”, “substrate”, “sheet” and “film” are not differentiated from one another based only on the difference of designations. For example, the “plate” is a concept including a member that can be referred to as sheet or film. The term “surface (sheet surface, film surface)” means a surface corresponding to a planar direction of a plate (sheet, film) member when the plate (sheet, film) member is seen as a whole and in perspective. A normal direction with regard to the plate (sheet, film) member means a normal direction with respect to a surface (sheet plane, film plane) of the member. Further, terms specifying shapes, geometric conditions and their degrees, e.g., “parallel”, “orthogonal”, etc., and values of a length and an angle are not limited to their strict definitions, but construed to include a range capable of exerting a similar function. 
     In the drawings referenced in the embodiments, the same or similar numeral is given to the same part or a part having a similar function, and the repeated description thereof may be omitted. A dimensional ratio of the drawings may differ from an actual one for convenience of explanation. A part of a structure may be omitted from the drawings. 
     First Embodiment 
     A first embodiment is described with reference to  FIGS. 1  to  9 .  FIGS. 1 to 9  are views showing the first embodiment. 
     Structure of Deposition Mask 
     A structure of a deposition mask according to this embodiment is described with reference to  FIGS. 1 and 2 . The deposition mask described herein is not limited to the embodiments described hereafter, and may be any embodiments which satisfy the following conditions: “a metal layer having a first opening formed therein and a resin mask having a second opening formed therein are laminated; the second opening is formed in an area overlapping the first opening; and the second opening correspond to a pattern to be made by deposition”. For example, the first opening formed in the metal layer may be stripe-shaped (not shown in figure). Further, the first opening of the metal layer may be formed at an area not overlapping an entire screen. The deposition mask may be manufactured either by a manufacturing method of a deposition mask described below or another method. 
     As shown in  FIGS. 1 and 2 , a deposition mask  10  according to this embodiment is a deposition mask for simultaneously forming deposition patterns corresponding to screens. The deposition mask  10  comprises a metal layer  20  provided with first openings  21 , and a resin mask  30  laminated to the metal layer  20  and provided with second openings  31 . The second openings  31  correspond to a pattern to be made by deposition. A support  40  is fixed to the metal layer  20 . 
     The deposition mask  10  is used for simultaneously forming deposition patterns of screens. Deposition patterns for products can be formed at the same time by using one deposition mask  10 . The “second openings” correspond to a pattern to be made by using the deposition mask  10 . For example, when the deposition mask is used for forming an organic layer in an organic EL display, the shape of the second opening  31  is reflected in the shape of the organic layer. A “one screen” comprises an aggregate of the second openings  31  corresponding to one product. When the product is an organic EL display, the aggregate of the organic layers needed to form one organic EL display constitutes a “one screen”. Namely, an aggregate of the second openings  31  corresponding to the organic layers constitutes a “one screen”. Herein, an area corresponding to a screen is also referred to as “effective part”. A plurality of screens such as the aforementioned “one screen” is arranged in the resin mask  30  at predetermined intervals. Namely, the resin mask  30  is provided with the second openings  31  needed to form screens. Thus, the deposition mask  10  can simultaneously form deposition patterns corresponding to screens. 
     The metal layer  20  is provided on a surface of the resin mask  30 . In the example shown in  FIG. 2 , the metal layer  20  is provided on a surface of the resin mask  30  facing negative in a Z direction. The metal layer  20  has a rectangular shape. The rectangular shape has a pair of sides extending in an X direction and a pair of sides extending in a Y direction. First openings  21  extending in the X direction and/or the Y direction are formed in the metal layer  20 . The first opening  21  may have an elongated slit shape. The first openings  21  are provided in an area overlapping the resin mask  30 . The second openings  31  are arranged inside one of the first openings  21  in a plan view. The layout of the first openings  21  is not specifically limited. The first openings  21  may be longitudinally arranged in lines, or the first openings  21  may be transversely arranged in lines. Longitudinally extending first openings  21  may be arranged in transverse lines. Transversely extending first openings  21  may be arranged in longitudinal lines. The first openings  21  may be longitudinally arranged in one line or may be transversely arranged in one line. 
     Each first opening  21  has a rectangular shape. The sides of first opening  21  respectively extend in the X direction and the Y direction. Each first opening  21  is provided in an area overlapping at least one entire screen. A length L 1  of the side of each first opening  21  may be, for example, greater than or equal to a length of a side of the effective part of the mask. The length L 1  of the side of each first opening  21  may exceed the side length of the effective part by 40 mm or less. A spacing W 2  between the adjacent first openings  21  may be, for example, 1 mm or more and 50 mm or less. 
     The material of the metal layer  20  is not specifically limited. A conventionally known material in the field of a deposition mask can be suitably selected and used as the material of the metal layer  20 . For example, the material of the metal layer  20  includes metal materials such as stainless steel, iron nickel alloy, or aluminum alloy. As an iron nickel alloy for the metal layer  20 , for example, an iron alloy having a total content of nickel and cobalt of 30% or more and 54% or less by mass, and a cobalt content of 0% or more and 6% or less by mass may be adopted. Specific examples of an iron alloy containing nickel or nickel and cobalt include an invar material having a nickel content of 34% or more and 38% or less by mass, a super invar material having a cobalt in addition to a nickel content of 30% or more and 34% or less by mass, etc. The material of the metal plate constituting the deposition mask  10  may be a Fe—Ni based plating alloy with a low thermal expansion, the alloy having a nickel content of 34% or more and 54% or less by mass. 
     A thickness T 1  of the metal layer  20  is also not specifically limited. In order to effectively prevent occurrence of shadow, the thickness T 1  of the metal layer  20  is preferably 100 μm or less, more preferably 50 μm or less, and particularly preferably 35 μm or less. When the thickness T 1  of the metal layer  20  is 1 μm or more, risks such as breakage and/or deformation of the metal layer  20  can be reduced, and the metal layer  20  can be easily handled. The phenomenon in which a no-deposition portion having a thickness smaller than an intended deposition film thickness is generated is called shadow. The phenomenon occurs when a part of a deposition material released from a deposition source hits a portion of the metal layer  20  near a surface on the support  40  side, thus failing to reach the deposition target. In particular, as the shape of the second opening  31  is being refined, the influence of shadow increases. 
     The resin mask  30  is provided on a surface of the metal layer  20 . In the example shown in  FIG. 2 , the resin mask  30  is provided on a surface of the metal layer  20  facing positive in the Z direction. The resin mask  30  has a rectangular shape. The sides of the resin mask extend in the X direction and the Y direction respectively. In this case, the resin mask  30  has the same outer shape of the metal layer  20 . However, not being limited thereto, the resin mask  30  and the metal layer  20  may have different outer shapes. 
     The resin mask  30  is provided with the second openings  31  needed to form screens. The second openings  31  are provided in areas overlapping the first openings  21  when the metal layer  20  and the resin mask  30  are laminated. A shape of each second opening  31  is not specifically limited and, for example, is rectangular. A dimension L 2  of the second opening  31  is, for example, 8 μm or more and 32 μm or less. 
     A conventionally known resin material may be suitably selected and used for the resin mask  30 . A material of the resin mask  30  is not specifically limited and a material which enables the forming of high-definition second opening  31  by laser processing or the like is preferably used. A material having a low ratio of change in dimension with heating and/or aging and having a low moisture-absorption ratio is preferably used as the material of the resin mask  30 . A light-weight material is preferably used as the material of the resin mask  30 . Examples of such a material include polyimide, polyamide, polyamide-imide, polyester, polyethylene, polyvinyl alcohol, polypropylene, polycarbonate, polystyrene, polyacrylonitrile, ethylene vinyl acetate copolymer, ethylene vinyl alcohol copolymer, ethylene-methacrylic acid copolymer, polyvinyl chloride, polyvinylidene chloride, cellophane, and ionomer. Among the materials exemplified above, a resin material having a thermal expansion coefficient of 16 ppm/° C. or less is preferred. Among the materials exemplified above, a resin material having a moisture-absorption ratio of 1.0% or less is preferred. A material satisfying both conditions of the thermal expansion coefficient and the moisture-absorption ratio is particularly preferred. A resin mask formed of such a resin material can improve the dimensional accuracy of the second openings  31  and can have a low ratio of change in dimension with heating and/or aging and a low moisture-absorption ratio. 
     A thickness T 2  of the resin mask  30  is also not specifically limited and is preferably 3 μm or more and 25 μm or less. The resin mask  30  having the thickness T 2  within this range can reduce the risk of defects such as pinholes and deformation of the resin mask  30 , and also can effectively suppress occurrence of shadow. In particular, when the thickness T 2  of the resin mask  30  is 3 μm or more and 10 μm or less, more preferably 4 μm or more and 8 μm or less, the influence of shadow can be more effectively reduced upon formation of a high-definition pattern exceeding 400 ppi. The resin mask  30  and the metal layer  20  may be joined to each other directly, or may be joined to each other through an adhesive layer. When the resin mask  30  and the metal layer  20  are joined to each other through an adhesive layer, a total thickness of the resin mask  30  and the adhesive layer is preferably within the aforementioned preferred thickness range. 
     The support  40  is provided on a surface of the metal layer  20 . In the example shown in  FIG. 2 , the support  40  is provided on a surface of the metal layer  20  facing negative in the Z direction. The support  40  supports the resin mask  30  and the metal layer  20 . The support  40  is referred to also as frame. 
     In the first embodiment, the support  40  supports the resin mask  30  and the metal layer  20  in a state where they are pulled in their planar directions such that the resin mask  30  and the metal layer  20  will not bend. The support  40  is a frame member having a substantially rectangular shape. The support  40  has through-hole  41  for exposing the second opening  31  to the deposition source. Namely, the second opening  31  is positioned inside the through-holes  41  in a plan view. An outer circumference of the support  40  is larger than those of the resin mask  30  and the metal layer  20 . A material of the support  40  is not specifically limited and a metal material having a high rigidity such as SUS, an invar material, a ceramic material or the like may be adopted. The support  40  made of metal is preferred because it can be easily welded to the metal layer  20  and is not susceptible to deformation. 
     A thickness T 3  of the support  40  is also not specifically limited. The thickness T 3  of the support  40  is preferably  10  mm or more and 50 mm or less in terms of rigidity. W 2  is a width between an end surface of the outer circumferential of the through-hole  41  and an end surface of the outer circumferential of the support  40 . As long as the metal layer  20  can be fixed to the support  40 , the width W 2  is not specifically limited. For example, the width W 2  is about 10 mm or more and 250 mm or less. 
     Whether the support  40  is provided is optional. The support  40  may not be provided. In this embodiment, the deposition mask  10  may include the support  40 . Namely, the deposition mask  10  may be a deposition mask with support. The deposition mask  10  may not include the support  40 . 
     Manufacturing Method of Deposition Mask 
     A manufacturing method of a deposition mask according to this embodiment is described with reference to  FIGS. 3 to 6 . With reference to  FIGS. 3 a  to 3 e   , a step of forming an intermediate is described first. The intermediate has a resin layer including a non-contact area. 
     A resin-layer forming step is described with reference to  FIGS. 3 a  and 3 b   . In the resin-layer forming step, a resin layer  30 A is formed on one surface of a substrate by applying a resin solution to the one surface of the substrate. First, as shown in  FIG. 3 a   , a substrate is prepared. In this embodiment, a metal plate  20 A is used as the substrate. The metal plate  20 A is for making the aforementioned metal layer  20  of the deposition mask  10 . The metal plate  20 A may be a strip metal member having a width of, for example, 250 mm or more and 1000 mm or less. An invar material which is an iron nickel alloy is suitably usable as a material of the metal plate  20 A. The metal plate  20 A is suitably subjected to a washing process and a surface treatment. 
     As shown in  FIG. 3 b   , the resin layer  30 A is formed on the one surface of the metal plate  20 A. The resin layer  30 A is for making the aforementioned resin mask  30  of the deposition mask  10 . A resin solution such as a polyimide varnish is applied to substantially an entire surface of the metal plate  20 A. Then, the resin solution is heated and dried. Thus, the resin layer  30 A is obtained. A thickness of the resin solution applied to the one surface of the metal plate  20 A is, for example, 3 μm or more and 250 μm or less. 
     A step of forming the non-contact area in the resin layer  30 A is described with reference to  FIGS. 3 c  to 3 e   . The non-contact area is formed by removing at least a part of the substrate such as the metal plate  20 A. The non-contact area is an area of the resin layer  30 A which is not in contact with the one surface of the metal plate  20 A. In the non-contact area, the resin layer  30 A is released from restraint which the resin layer  30 A receives from the metal plate  20 A. In the description below, the step of forming the non-contact area in the resin layer  30 A is also referred to as releasing step. In the releasing step, a masking member such as a resist material is first applied to the other surface of the metal plate  20 A. The other surface of the metal plate  20 A is a surface which is not provided with the resin layer  30 A. Following thereto, predetermined portions of the resist material are exposed to light and developed. Thus, as shown in  FIG. 3 c   , a resist pattern  51  is formed. The resist pattern  51  exposes an area of the metal plate  20 A from the resist material. In the area the first opening  21  will be formed. The resist material for the masking member preferably has an improved processability and can achieve a desired resolution. 
     Then, as shown in  FIG. 3 d   , the metal plate  20 A is etched by using the resist pattern  51  as an etching-resistant mask. Thus, the metal layer  20  is obtained. The metal layer  20  is provided with first openings  21  extending longitudinally and/or transversely. 
     Then, as shown in  FIG. 3 e   , the resist pattern  51  is washed and removed. After the resist pattern  51  has been removed, the resin layer  30 A and the metal layer  20  may be cut into a size corresponding to the support  40 . 
     In this manner, a laminate having the metal layer  20  provided with the first openings  21  and the resin layer  30 A laminated to the metal layer  20  is obtained. In the laminate, the resin layer  30 A partially includes a non-contact area  35  that is not in contact with the one surface of the metal plate  20 A. In the description below, a member having the resin layer  30 A including the non-contact area  35 , like the laminate shown in  FIG. 3 e   , is referred to also as intermediate  15 . 
     In the above description, the example in which the resist material is used as the masking member is described. However, the above described patterning may be performed by laminating a dry film resist instead of applying the resist material. The metal layer  20  of the intermediate  15  is not limited to one which is formed by the above exemplified method, and a commercially available one is usable. The first openings  21  may be formed by a way of applying a laser beam instead of the way of etching. 
     When the resin layer  30 A is formed by applying a resin solution and drying the resin solution, strain may occur and remain in the resin layer  30 A. This embodiment proposes a relieving step for reducing the strain inside the resin layer  30 A. The resin layer  30 A including the non-contact area  35  is subjected to the relieving step before the second openings  31  are formed in the resin layer  30 A. 
       FIG. 4  shows an example of the relieving step. In the example shown in  FIG. 4 , the relieving step includes a liquid contacting step of bringing the resin layer  30 A into contact with a liquid. In the liquid contacting step, a container  61  containing a liquid  62  such as a solvent is prepared first. Water, organic solvent, alkaline aqueous solution, etc., are usable as the liquid  62 . NMP (N-methyl-2-pyrrolidone) or the like is usable as the organic solvent. Semi Clean RPG-1 manufactured by YOKOHAMA OILS &amp; FATS INDUSTRY CO., LTD. is usable as the alkaline aqueous solution. 
     Following thereto, the intermediate  15  is immersed in the liquid  62 . The intermediate  15  includes the metal layer  20  formed of the metal plate  20 A having the first openings  21  formed therein and the resin layer  30 A laminated to the metal layer  20 . A time for immersing the intermediate  15  in the liquid  62  is preferably 10 minutes or more and 60 minutes or less, more preferably 15 minutes or more and 30 minutes or less. When the liquid is water, a temperature of the water is preferably 20° C. or more and 100° C. or less, more preferably 20° C. or more and 60° C. or less. The container  61  may be filled with the liquid  62  after the intermediate  15  has been placed in the container  61 . 
     After the intermediate  15  has been taken out from the liquid  62 , the intermediate  15  is dried. The intermediate  15  may be dried by natural drying or drying process using a dryer, an oven, etc. An organic solvent having a high boiling point such as NMP is usable as the liquid  62 . In this case, after the intermediate  15  has been taken out from the liquid  62 , the intermediate  15  may be again immersed in a low boiling-point solution having a boiling point lower than that of the liquid  62 . After that, the intermediate  15  is taken out from the low boiling-point liquid and then dried. Alcohol such as isopropyl alcohol, or water is usable as the low boiling-point solution. 
     As supported by Examples described later, the strain inside the resin layer  30 A can be reduced by bringing a liquid, such as water, into contact with the resin layer  30 A having the residual strain. 
     The aforementioned liquid contacting step may include an ultrasonically processing step of ultrasonically processing the resin layer  30 A. For example, the container  61  is provided with an ultrasonic vibrator that mechanically vibrates. Ultrasonic waves can be generated in the liquid  62  by vibrations of the ultrasonic vibrator. A frequency of the ultrasonic waves is 40 kHz or more and 170 kHz or less. Electric power applied to the ultrasonic vibrator is, for example, 100 W or more and 500 W or less. 
       FIG. 5  shows another example of the relieving step. In the example shown in  FIG. 5 , the relieving step includes a heating step of heating the resin layer  30 A. In the heating step, the intermediate  15  is heated by using an oven  71 . A time for heating the intermediate  15  is preferably 10 minutes or more and 120 minutes or less, more preferably 30 minutes or more and 60 minutes or less. A heating temperature is preferably 80° C. or more and 150° C. or less, more preferably 100° C. or more and 120° C. or less. 
     As supported by Examples described later, the strain inside the resin layer  30 A can be reduced by heating the resin layer  30 A having the residual strain. 
     Both the aforementioned liquid contacting step and the heating step may be performed. For example, the heating step may be performed after the liquid contacting step. In this case, the heating step functions also as a drying step of removing a liquid adhering to the resin layer  30 A of the intermediate  15 . Alternatively, only one of the aforementioned liquid contacting step and the heating step may be performed. 
     Then, a support fixing step is performed. In the support fixing step, as shown in  FIG. 6 a   , the support  40  is prepared, and the metal layer  20  of the intermediate  15  is fixed to the support  40 . The metal layer  20  of the intermediate  15  may be welded to the support  40  in a state where tension is applied to the metal layer  20 . Although the support fixing step is an optional step in this embodiment, the deposition mask  10  to which the support  40  is fixed is often used in a conventional deposition apparatus. Thus, the support fixing step is preferably performed at this timing. A method of fixing the metal layer  20  to the support  40  is not specifically limited. For example, when the support  40  contains a metal, a conventionally known step or method such as spot welding may be suitably adopted. 
     A resin-layer processing step is performed. In the resin-layer processing step, the second openings  31  are formed in the resin layer  30 A by processing the resin layer  30 A. As shown by arrows in  FIG. 6 b   , laser is applied to the resin layer  30 A of the intermediate  15  from the metal layer  20  side. Thus, the second openings  31  corresponding to a pattern to be made by deposition are formed in the resin layer  30 A. KrF excimer laser having a wavelength of 248 nm or YAG laser having wavelength of 355 nm is usable as laser. The second openings  31  may be formed by applying laser from the metal layer  20  side with the protective film being attached to a surface of the resin layer  30 A opposite to the surface facing the metal layer  20 . The second openings  31  may be formed by a laser processing method using a so-called reduced projection optical system. In this case, a not-shown laser mask corresponding to a pattern to be made by deposition is usable, and a condenser lens may be installed between the laser mask and the resin layer  30 A. In this manner, the deposition mask  10  shown in  FIGS. 1 and 2  is obtained. 
     Although not shown in figure, in the resin-layer processing step, laser may be applied to the resin layer  30 A of the intermediate  15  not fixed to the support  40 . In this case, the metal layer  20  may be fixed to the support  40  after the second opening  31  have been formed. 
     An inspecting step of inspecting a position of the second opening  31  may be performed. In the inspecting step, for example, a deposition mask  10  in which a difference between an ideal position of the second opening  31  and an actual position of the second opening  31  is within an allowable range is determined to be acceptable. The ideal position of the second opening  31  is predetermined as a relative position with respect to a reference point on the deposition mask  10 , for example. The reference point is, for example, the central position of the deposition mask  10 . The position of the second opening  31  is, for example, the central point of the second opening  31 . The number of second openings  31  to be inspected is optional. For example, all the second openings  31  may be inspected or some of the second openings  31  may be inspected. 
     Structure of Deposition Apparatus 
     A deposition apparatus is described with reference to  FIG. 7 . The deposition apparatus deposits a deposition material to a deposition target by using the aforementioned deposition mask  10 . 
     As shown in  FIG. 7 , a deposition apparatus  80  has therein a deposition source (e.g., crucible  81 ), a heater  82  and the deposition mask  10 . The deposition apparatus  80  further has evacuation means (not shown in figure) that creates a vacuum atmosphere inside the deposition apparatus  80 . The crucible  81  accommodates a deposition material  92  such as an organic luminescence material. The heater  82  heats the crucible  81  and evaporates the deposition material  92  under a vacuum atmosphere. The deposition mask  10  is arranged to face the crucible  81 . Namely, the deposition mask  10  is arranged in the deposition apparatus  80  such that the resin mask  30  faces a substrate to be deposited. The substrate to be deposited  91  is a deposition target to which the deposition material  92  is deposited. The substrate to be deposited  91  is, for example, an organic EL substrate. The deposition apparatus  80  may have a magnet  83 . The magnet  83  is arranged on a surface of the substrate to be deposited  91  opposite to the surface facing the resin mask  30 . Since the magnet  83  magnetically attracts the deposition mask  10  toward the magnet  83 , the deposition mask  10  can be in contact with the substrate to be deposited  91 . 
       FIG. 8  is a sectional view showing an organic EL display  90  manufactured by using the deposition apparatus  80  shown in  FIG. 7 . As shown in  FIG. 8 , the organic EL display  90  comprises the substrate to be deposited  91  and pixels containing the deposition material  92  patterned on the substrate to be deposited  91 . The substrate to be deposited  91  is, for example, the organic EL substrate. 
     In the case of displaying colors, the deposition apparatuses  80  provided with the deposition mask  10  corresponding to each color are respectively prepared. The substrate to be deposited  91  is put into the respective deposition apparatuses  80  in sequence. Thus, for example, an organic luminescence material for red color, an organic luminescence material for green color and an organic luminescence material for blue color can be deposited to the substrates to be deposited  91  in sequence. 
     Manufacturing Method of Organic EL Display 
     A manufacturing method of an organic EL display according to this embodiment is described with reference to  FIGS. 9 a  to 9 c   . The manufacturing method of an organic EL display according to this embodiment forms a deposition pattern by depositing the deposition material  92  to the substrate to be deposited  91  by a deposition method using the aforementioned deposition mask  10 . 
     As shown in  FIG. 9 a   , the deposition apparatus  80  comprising the deposition mask  10  shown in  FIGS. 1 and 2 , the crucible  81  accommodating the deposition material  92  and the heater  82  is prepared. 
     Next, as shown in  FIG. 9 b   , the substrate to be deposited  91  and the deposition mask  10  are assembled such that the substrate to be deposited  91  and the resin mask  30  of the deposition mask  10  face each other. For example, the substrate to be deposited  91  is placed on the resin mask  30  of the deposition mask  10 . At this time, for example, the substrate to be deposited  91  is placed on the deposition mask  10  by positioning the substrate to be deposited  91  such that a not-shown alignment mark of the substrate to be deposited  91  and a not-shown alignment mark of the deposition mask  10  align by direct observation. 
     Then, a deposition step is performed. In the deposition step, the deposition material  92  is deposited to the substrate to be deposited  91  placed on the resin mask  30  of the deposition mask  10 . At this time, for example, as shown in  FIG. 9 c   , the magnet  83  is arranged on a surface of the substrate to be deposited  91  opposite to the surface facing the deposition mask  10 . Since the magnet  83  magnetically attracts the deposition mask  10  toward the magnet  83 , the deposition mask  10  can be in contact with the substrate to be deposited  91 . Then, the heater  82  heats the crucible  81  and evaporates the deposition material  92 . The deposition material  92  evaporates from crucible  81  and reaches the deposition mask  10 . The deposition material  92  is deposited to the substrate to be deposited  91  through the first opening  21  and the second opening  31 . 
     In this manner, the deposition material  92  is deposited to the substrate to be deposited  91  in a desired pattern corresponding to the position of the second opening  31 . Namely, the deposition material  92  is deposited to the substrate to be deposited  91  in a pattern having a shape corresponding to the second opening  31 . Specifically, the deposition material  92  is deposited to the substrate to be deposited  91  in a pattern composed of polygons each having rounded corners. In this manner, the organic EL display  90  comprising the substrate to be deposited  91  and patterned pixels containing the deposition material  92  is obtained (see  FIG. 8 ). 
     When the organic EL displays  90  are repeatedly made by using the deposition mask  10 , organic substances and the like adhere to the deposition mask  10 . The used deposition mask  10  is immersed in a washing liquid and washed in order to remove the organic substances. At this time, the deposition mask  10  may be washed by ultrasonic washing that generates ultrasonic waves in the washing liquid. A frequency of ultrasonic waves generated in the washing liquid is 40 kHz or more and 170 kHz or less, for example. When strain remains inside the resin layer  30 A, the resin layer  30 A may be displaced because of relief of the strain. As a result, the position of the second opening  31  may also be displaced. 
     In this embodiment, the strain inside the resin layer  30 A is reduced by performing the relieving step to the resin layer  30 A before the second opening  31  is formed in the resin layer  30 A. Thus, when the resin layer  30 A is brought into contact with a liquid or when the resin layer  30 A is heated after the formation of the second opening  31 , displacement of a position of the second opening  31  can be suppressed. Thus, a difference between an ideal position of the second opening  31  and an actual position of the second opening  31  can be suppressed from exceeding an allowable range after the deposition mask  10  has been determined to be acceptable in the inspecting step and shipped. 
     Modification Example of Relieving Step and Support Fixing Step 
     In the aforementioned embodiment, the example is shown in which the support fixing step of fixing the support  40  to the intermediate  15  is performed after the relieving step. However, not being limited thereto, the support fixing step may be performed before the relieving step. For example, as shown in  FIG. 10 , in the liquid contacting step of the relieving step, the liquid may be brought into contact with the intermediate  15  fixed to the support  40  in a state where tension is applied to the intermediate  15 . In addition, as shown in  FIG. 11 , in the heating step of the relieving step, the intermediate  15  fixed to the support  40  in a state where tension is applied to the intermediate  15  may be heated. 
     Second Embodiment 
     A second embodiment is described with reference to  FIGS. 12 and 13 .  FIGS. 12 and 13  are views showing the second embodiment. The second embodiment differs from the aforementioned first embodiment in that the metal layer  20  is not provided, etc. In  FIGS. 12 and 13 , the same part of the first embodiment shown in  FIGS. 1 to 11  designated by the same reference numeral, and detailed description thereof is omitted. Hereafter, differences from the first embodiment are mainly described. 
       FIG. 12  is a sectional view showing a deposition mask  10 A according to the second embodiment. The deposition mask  10 A comprises a resin mask  30  provided with second openings  31  and a support  40 A fixed to the resin mask  30 . The support  40 A is a member also referred to as open mask. 
     The support  40 A is provided on one surface of the resin mask  30 . Through-holes  41 A are formed in the support  40 A. Each through-hole  41 A is formed to have a size corresponding to one screen. The first openings  21 B are arranged to overlap with the through-hole  41 A in a plan view. 
     The support  40 A supports the resin mask  30 . The support  40 A is joined to the resin mask  30  in a state either no tension is applied to the resin mask  30  or tension is applied to the resin mask  30 . The support  40 A is a sheet member having a thickness of 20 μm or more and 10 mm or less. The support  40 A may be formed of a metal material such as invar or invar alloy. Although not shown in figure, the same support  40  as that of the first embodiment may further be provided to a surface of the support  40 A. When the same support  40  as that of the first embodiment is provided to the surface of the support  40 A, a thickness of the support  40 A is preferably 20 μm or more and 1 mm or less. When the same support  40  as that of the first embodiment is not provided to the surface of the support  40 A, the thickness of the support  40 A is preferably 1 mm or more and 10 mm or less. For example, the support  40 A made by shaving a thick metal plate having a thickness of 1 mm or more is usable. For example, a support  40 A having areas with different thicknesses in its plane may be made by partially shaving a metal plate of about 10 mm thickness. 
     Manufacturing Method of Deposition Mask 
     A manufacturing method of a deposition mask according to this embodiment is described with reference to  FIGS. 13 a  to 13 d   .  FIGS. 13 a  to 13 d    are views showing a step of forming an intermediate having a resin layer including a non-contact area. 
     As shown in  FIG. 13 a   , a substrate is prepared. In this embodiment, a glass plate  50  is used as the substrate. A thickness of the glass plate  50  is, for example, 0.1 mm or more and 2.8 mm or less. 
     Next, as shown in  FIG. 13 b   , a resin layer  30 A is formed on the glass plate  50 . The resin layer  30 A is for making the aforementioned resin mask  30  of the deposition mask  10 A. Specifically, the resin layer  30 A is obtained by applying a resin solution such as a polyimide varnish to substantially an entire surface of the glass plate  50 , and then heating and drying the resin solution. A thickness of the resin solution applied to the surface of the glass plate  50  is, for example, 3 μm or more and 250 μm or less. 
     Next, as shown in  FIG. 13 c   , a support fixing step of fixing a support  40 A to the resin layer  30 A is performed. Thereafter, as shown in  FIG. 13 d   , a peeling step of peeling the resin layer  30 A from the glass plate  50  is performed in a state where the resin layer  30 A is fixed to the support  40 A. Thus, as shown in  FIG. 13 c   , a non-contact area  35  can be generated in the resin layer  30 A. In the non-contact area  35 , the resin layer  30 A is not in contact with the surface of the glass plate  50 . In this manner, an intermediate  15  having the resin layer  30 A including the non-contact area  35  can be obtained. In this embodiment, the peeling step of peeling the resin layer  30 A from the glass plate  50  serves as a releasing step of forming the non-contact area  35  in the resin layer  30 A by removing the substrate. 
     Following thereto, a relieving step is performed. The reliving step brings the resin layer  30 A of the intermediate  15  into contact with a liquid, or heats the resin layer  30 A of the intermediate  15 . Thereafter, a resin-layer processing step is performed. In the resin-layer processing step, second openings  31  are formed in the resin layer  30 A by processing the resin layer  30 A. Thus, a resin mask  30  provided with the second openings  31  is obtained. Since the relieving step and the resin-layer processing step are the same as those of the aforementioned first embodiment, description thereof is omitted. 
     Also, in this embodiment, the strain inside the resin layer  30 A is reduced by performing the relieving step to the resin layer  30 A before the second openings  31  are formed in the resin layer  30 A. Thus, after the second openings  31  have been formed in the resin layer  30 A, displacement of the positions of the second openings  31  can be suppressed. 
     Although not shown in figure, also in this embodiment, the support fixing step of fixing the support  40  to the intermediate  15  may be performed after the relieving step as is the case in the aforementioned embodiment. 
     Third Embodiment 
     A third embodiment is described with reference to  FIGS. 14 to 16 .  FIGS. 14 to 16  are views showing the third embodiment. The third embodiment differs from the aforementioned first embodiment in that the metal layer  20  is formed by a plating process, etc. In  FIGS. 14 to 16 , the same part of the first embodiment shown in  FIGS. 1 to 11  or the second embodiment shown in  FIGS. 12 and 13  is designated by the same reference numeral, and detailed description thereof is omitted. Hereafter, differences from the first embodiment or the second embodiment are mainly described. 
     Structure of Deposition Mask 
     A structure of a deposition mask according to this embodiment is described with reference to  FIG. 14 . 
     As shown in  FIG. 14 , a deposition mask  10 B according to this embodiment comprises a metal layer  20 B provided with first openings  21 B and a resin mask  30  provided with second openings  31 . A support  40 A is fixed to the metal layer  20 B. 
     The metal layer  20 B is provided on a surface of the resin mask  30 . In the example shown in  FIG. 14 , the metal layer  20 B is provided on a surface of the resin layer  30  facing negative in a Z direction. First openings  21 B extending longitudinally or transversely are formed in the metal layer  20 B. In this embodiment, the metal layer  20 B is formed by electrolytic plating. A material of such a metal layer  20 B is not specifically limited. For example, the material of the metal layer  20 B may be a metal material such as nickel or nickel alloy. A thickness of the metal layer  20 B is not also specifically limited. A thickness of the metal layer  20 B may be 1 μm or more and 50 μm or less. 
     The resin mask  30  is provided on a surface of the metal layer  20 B. In the example shown in  FIG. 14 , the resin mask  30  is provided on a surface of the metal layer  20 B facing positive in the Z direction. The resin mask  30  is provided with the second openings  31  needed to form screens. In this case, the second openings  31  are provided such that one second opening  31  overlaps with one first opening  21 B in a plan view. However, not being limited thereto, the second openings  31  may be provided such that the second openings  31  overlap with one first opening  21 B in a plan view. 
     The support  40 A is provided on a surface of the metal layer  20 B. In the example shown in  FIG. 14 , the support  40  is provided on the surface of the metal layer  20 B facing negative in the Z direction. Through-holes  41 A are formed in the support  40 A. Each through-hole  41 A is formed to have a size corresponding to one screen. The through-hole  41 A is arranged to overlap with the first openings  21 B and the second openings  31  in a plan view. 
     The support  40 A supports the metal layer  20 B. The support  40 A is joined to the metal layer  20 B in a state either no tension is applied to the metal layer  20 B or tension is applied to the metal layer  20 B. The support  40 A is a sheet member having a thickness of 20 μm or more and 10 mm or less. The support  40 A may be formed of a metal material such as invar or invar alloy. Although not shown in figure, the same support  40  as that of the first embodiment may further be provided on a surface of the support  40 A. When the same support  40  as that of the first embodiment is provided on a surface of the support  40 A, a thickness of the support  40 A is preferably 20 μm or more and 1 mm or less. When the same support  40  as that of the first embodiment is not provided on a surface of the support  40 A, the thickness of the support  40 A is preferably 1 mm or more and 10 mm or less. For example, the support  40 A made by shaving a thick metal plate having a thickness of 1 mm or more is usable. For example, a support  40 A having areas with different thicknesses in a plane may be made by partially shaving a metal plate of about 10 mm thickness. 
     Manufacturing Method of Deposition Mask 
     A manufacturing method of a deposition mask according to this embodiment is described with reference to  FIGS. 15 and 16 . A step of forming an intermediate having a resin layer including non-contact area is described with reference to  FIGS. 15 a    to  15   f.    
     A resin-layer forming step is described with reference to  FIGS. 15 a  and 15 b   . In the resin-layer forming step, a resin solution is applied to a surface of a substrate so that a resin layer  30 A is formed on the surface of the substrate. First, a substrate is prepared as shown in  FIG. 15 a   . As is the case in the second embodiment, this embodiment uses a glass plate  50  as the substrate. Then, as is the case in the second embodiment, as shown in  FIG. 15 b   , a resin layer  30 A is formed on the glass plate  50 . A thickness of the resin solution applied to the surface of the glass plate  50  is, for example, 3 μm or more and 250 μm or less. 
     A releasing step is described with reference to  FIGS. 15 c  to 15 f   . The releasing step generates a non-contact area at least partially in the resin layer  30 A. In the non-contact area, the resin layer  30 A is not in contact with the surface of the metal plate  20 A. As shown in  FIG. 15 c   , a not-shown seed layer made of a metal such as nickel is formed on the resin layer  30 A. Next, a photosensitive resist is applied to the seed layer, and the photosensitive resist is dried. Following thereto, the photosensitive resist is exposed to light through a photomask, and developed. Thus, a resist layer  56  having a pattern corresponding to the first openings  21 B is formed. 
     Next, as shown in  FIG. 15 d   , the glass plate  50  and the resin layer  30 A are electrolytically plated. Thus, a metal such as nickel is precipitated on the seed layer formed on the resin layer  30 A. The metal precipitates on a portion on the seed layer where the resist layer  56  does not exist. Thus, the metal layer  20 B is formed. 
     Following thereto, as shown in  FIG. 15 e   , the resist layer  56  and the seed layer are removed in sequence, and the metal layer  20 B provided with the second openings  21 B is formed on the resin layer  30 A. 
     Thereafter, as shown in  FIG. 15 f   , a peeling step is performed. In the peeling step, the resin layer  30 A laminated to the metal layer  20 B is peeled from the glass plate  50 . Thus, as shown in  FIG. 15 f   , a non-contact area  35  can be formed in the resin layer  30 A. In the non-contact area  35 , the resin layer  30 A is not in contact with a surface of the glass plate  50 . In this manner, an intermediate  15  having the resin layer  30 A including the non-contact area  35  and the metal layer  20 B laminated to the resin layer  30 A can be obtained. Also in this embodiment, as is the case in the second embodiment, the peeling step of peeling the resin layer  30 A from the glass plate  50  serves as a releasing step of forming the non-contact area  35  in the resin layer  30 A by removing the substrate. 
     Following thereto, a relieving step is performed. The reliving step brings the resin layer  30 A of the intermediate  15  into contact with a liquid, or heats the resin layer  30 A of the intermediate  15 . Since the relieving step is the same as that of the aforementioned first embodiment, description thereof is omitted. 
     Following thereto, as shown in  FIG. 16 a   , a support fixing step is performed. In the support fixing step, a support  40  is prepared and then the metal layer  20  of the intermediate  15  is fixed to the support  40 . Thereafter, a resin-layer processing step is performed. In the resin-layer processing step, the second openings  31  are formed in the resin layer  30 A by processing the resin layer  30 A. As shown by arrows in  FIG. 16 b   , laser is applied to the resin layer  30 A of the intermediate  15  from the metal layer  208  side so that the second openings  31  are formed. In this manner, the resin mask  30  provided with the second openings  31  is obtained. 
     Also, in this embodiment, the strain inside the resin layer  30 A is reduced by performing the relieving step to the resin layer  30 A before the second openings  31  are formed in the resin layer  30 A. Thus, after the second openings  31  in the resin layer  30 A has been formed, displacement of the positions of the second openings  31  can be suppressed. 
     Although not shown in figure, the support fixing step of fixing the metal layer  20  to the support  40  may be performed after the resin-layer processing step of forming the second opening  31  in the resin layer  30 A has been performed. 
     Modification Example 1 of Manufacturing Method of Deposition Mask 
     A modification example of the manufacturing method of a deposition mask according to this embodiment is described with reference to  FIGS. 17 a    to  17   f.    
     As shown in  FIGS. 17 a  to 17 e   , a resin layer  30 A is formed on a surface of a glass plate  50 , and then a metal layer  20 B provided with first openings  21 B is formed on a surface of the resin layer  30 A. Since these steps are the same as the aforementioned steps shown in  FIGS. 15 a  to 15 e   , detailed description thereof is omitted. 
     Next, as shown in  FIG. 17 f   , the metal layer  20 B of a laminate is fixed to a support  40 A. The laminate includes the resin layer  30 A and the metal layer  20 B. The metal layer  20 B of the laminate is welded to the support  40 A in a state where no tension is applied to the laminate. 
     Next, as shown in  FIG. 17 g   , a peeling step is performed. In the peeling step, the resin layer  30 A is peeled from the glass plate  50  in a state where the resin layer  30 A, the metal layer  20 B and the support  40 A are laminated. Thus, as shown in  FIG. 17 g   , a non-contact area  35  can be generated in the resin layer  30 A. In the non-contact area  35 , the resin layer  30 A is not in contact with a surface of the glass plate  50 . In this manner, an intermediate  15  having the resin layer  30 A including the non-contact area  35  and the metal layer  20 B laminated to the resin layer  30 A is obtained wherein the support  40 A has been fixed to the intermediate  15 . 
     Following thereto, a relieving step is performed. The reliving step brings the resin layer  30 A of the intermediate  15  into contact with a liquid, or heats the resin layer  30 A of the intermediate  15 . As is the case in the aforementioned relieving step shown in  FIG. 10 or 11 , the relieving step is performed to the intermediate  15  in a state where the support is fixed to the intermediate  15 . 
     Thereafter, a resin-layer processing step is performed. In the resin-layer processing step, second openings  31  are formed in the resin layer  30 A by processing the resin layer  30 A. In this manner, a resin mask  30  provided with the second openings  31  is obtained. 
     Elements disclosed in the aforementioned embodiments and the modification examples may be suitably combined according to need. Alternatively, some elements may be deleted from the elements disclosed in the aforementioned embodiments and the modification examples. 
     EXAMPLES 
     Next, the present invention is described in more detail with examples. The present invention is, however, not limited to the following examples as long as it does not go out from the scope of the present invention. 
     Example 1 
     A deposition mask  10  according to the aforementioned first embodiment was made by a procedure described below. First, a metal plate  20 A having the thickness of 20 μm and containing an iron nickel alloy was prepared. The metal plate  20 A was of a rectangular shape having long sides of 730 mm and short sides of 460 mm. The content ratio of nickel in the metal plate  20 A was 36% by mass. Then, a resin layer  30 A having the thickness of 5 μm and containing polyimide was formed on the metal plate  20 A. Following thereto, first openings  21  were formed in the metal plate  20 A by etching the metal plate  20 A. In this manner, an intermediate  15  having the resin layer  30 A including a non-contact area  35  was obtained. Following thereto, a support  40  was fixed to the metal layer  20  of the intermediate  15  in a state where tension was applied to the intermediate  15 . 
     Following thereto, the intermediate  15  fixed to the support  40  was ultrasonically processed by using pure water for 15 minutes. The frequency was 80 kHz and the temperature of the pure water was 25° C. Thereafter, the intermediate  15  was heated at 100° C. for 30 minutes by using an oven. 
     Thereafter, second openings  31  were formed in the resin layer  30 A by applying a laser beam to the resin layer  30 A. The dimension of the second opening  31  was 16 μm. In this manner, the deposition mask  10  was made. 
     Thereafter, positions of the second openings  31  were measured. Specifically, as shown in  FIG. 18 , positions of the center point P 1  of the second openings  31  in the deposition mask  10  with respect to the reference point P 0  were measured. The reference point P 0  was the center position of the deposition mask  10 . The number of second opening  31  to be measured was  36 . An automatic 2D/3D coordinate measuring machine AMIC-700 manufactured by Shinto S Precision was used as a measuring instrument. 
     Following thereto, the deposition mask  10  was washed. Specifically, the deposition mask  10  was ultrasonically washed by using pure water for 15 minutes. Thereafter, the deposition mask  10  was heated at 100° C. for 30 minutes by using an oven and dried. The frequency was 80 kHz and the temperature of the pure water was 25° C. The temperature of the oven was 100° C. and the heating time was 30 minutes. 
     After the first washing, the positions of the second openings  31  were again measured. In addition, the amount of change in the position of each second opening  31  before and after the first washing was calculated.  FIG. 19  shows the average value, the maximum value and the minimum value of amounts of change in the positions of the 36 second openings  31 . 
     Following thereto, the deposition mask  10  was again washed. The washing conditions were the same as those of the first washing. 
     After the second washing, the positions of the second opening  31  were again measured. In addition, the amount of change in the position of each second opening  31  before and after the second washing was calculated.  FIG. 19  shows the average value, the maximum value and the minimum value of amounts of change in the positions of the 36 second opening  31 . 
     Comparative Example 1 
     A deposition mask  10  was made in the same manner as in Example 1 except that the resin layer  30 A was not ultrasonically processed nor heated before the second openings  31  were formed. As is the case in Example 1, positions of the second openings  31  were measured. 
     Following thereto, as is the case in Example 1, the deposition mask  10  was washed. After the first washing, as is the case in Example 1, the positions of the second openings  31  were again measured. In addition, the amount of change in the position of each second opening  31  before and after the first washing was calculated.  FIG. 19  shows the average value, the maximum value and the minimum value of amounts of change in the positions of the 36 second openings  31 . 
     As shown in  FIG. 19 , in Example 1, the average value of amounts of change in the positions of the second openings  31  before and after the first washing was 1 μm or less both in the X direction and the Y direction. To be specific, the average value of amount of change was 0.6 μm or less. On the other hand, in Comparative Example 1, the average value of amounts of change in the positions of the second openings  31  before and after the first washing was over 1 μm both in the X direction and the Y direction. Accordingly, it can be said that ultrasonically processing and heating of the resin layer  30 A before forming the second opening  31  in the resin layer  30 A contribute to suppress change in a position of the second opening  31  caused by washing. 
     As shown in  FIG. 19 , in Example 1, the average value and the maximum value of amounts of change in the positions of the second openings  31  before and after the first washing were about the same as the average value and the maximum value of amounts of change in the positions of the second openings  31  before and after the second washing. From these results, the deposition mask  10  in Example 1 is expected to have stability in position of the second opening  31  even after it is repeatedly washed. 
     Example 2 
     As is the case in Example 1, an intermediate  15  having a resin layer  30 A including a non-contact area  35  was made. Following thereto, a support  40  was fixed to the metal layer  20  of the intermediate  15  in a state where tension was applied to the intermediate  15 . 
     Following thereto, the intermediate  15  fixed to the support  40  was immersed in pure water for 15 minutes. The temperature of the pure water was 25° C. Thereafter, the intermediate  15  was heated at 100° C. for 30 minutes by using an oven. 
     Thereafter, second openings  31  were formed in the resin layer  30 A by applying a laser beam to the resin layer  30 A. The dimension of the second opening  31  was 16 μm. In this manner, the deposition mask  10  was made. 
     Thereafter, as is the case in the Example 1, positions of the second openings  31  were measured. Then, the deposition mask  10  was washed. Specifically, the deposition mask  10  was immersed in pure water for 15 minutes. Then, the deposition mask  10  was dried by heating the deposition mask  10  at 100° C. for 30 minutes by using an oven. The temperature of the pure water was 25° C. The temperature of the oven was 100° C. and the heating time was 30 minutes. 
     After the first washing, the positions of the second openings  31  were again measured. In addition, the amount of change in the position of each second opening  31  before and after the first washing was calculated.  FIG. 20  shows the average value, the maximum value and the minimum value of amounts of change in the positions of the 36 second openings  31 . 
     Comparative Example 2 
     A deposition mask  10  was made in the same manner as in Example 2 except that the resin layer  30 A was not immersed in pure water nor heated. As is the case in Example 2, positions of the second openings  31  were measured. 
     Following thereto, as is the case in Example 2, the deposition mask  10  was washed. After the first washing, as is the case in Example 2, the positions of the second openings  31  were again measured. In addition, the amount of change in the position of each second opening  31  before and after the first washing was calculated.  FIG. 20  shows the average value, the maximum value and the minimum value of amounts of change in the positions of the 36 second opening  31 . 
     As shown in  FIG. 20 , in Example 2, the average value of amounts of change in the positions of the second openings  31  before and after the first washing was 1 μm or less both in the X direction and the Y direction. To be specific, the average value of amounts of change was 0.8 μm or less. On the other hand, in Comparative Example 2, the average value of amounts of change in the positions of the second openings  31  before and after the first washing was over 1 μm both in the X direction and the Y direction. Accordingly, it can be said that immersing of the resin layer  30 A in pure water and heating of the resin layer  30 A before the second openings  31  are formed in the resin layer  30 A contribute to suppress change in a position of the second opening  31  caused by washing. 
     Some modification examples of the aforementioned embodiments are described above. It goes without saying that these modification examples can be suitably combined.
       10  Deposition mask     15  Intermediate     20  Metal layer     20 A First opening     30  Resin mask     30 A Resin layer     31  Second opening     35  Non-contact area     40  Support     41  Through-hole     50  Glass plate     60  Washing apparatus     61  Container     62  Liquid     70  Heating apparatus     71  Oven