Patent Publication Number: US-2020291510-A1

Title: Deposition mask apparatus

Description:
TECHNICAL FIELD 
     An embodiment of the present disclosure relates to a deposition mask device comprising a deposition mask having a plurality of through-holes formed therein, a frame that supports the deposition mask. 
     BACKGROUND ART 
     A display device used in a portable device such as a smart phone and a tablet PC is required to have high fineness, e.g., a pixel density of 400 ppi or more. In addition, there is increasing demand that the portable device is applicable to ultra-high definition (UHD). In this case, the pixel density of a display device is preferably 800 ppi or more. 
     Among display devices, an organic EL display device draws attention because of its excellent responsibility, low power consumption, and high contrast. A known method for forming pixels of an organic EL display device is a method which uses a deposition mask in which through-holes are formed and arranged in a desired pattern, and forms pixels in the desired pattern. To be specific, a deposition mask is firstly brought into tight contact with a substrate for an organic EL display device, and then the substrate and the deposition mask in tight contact therewith are put into a deposition apparatus so as to conduct a deposition step of depositing an organic material on the substrate. In this case, in order to precisely manufacture a an organic EL display device having a high pixel density, positions and shapes of the through-holes in the deposition mask are required to be precisely recreated in accordance with a design. 
     A deposition apparatus that deposits a deposition material such as an organic material onto a substrate comprises a deposition mask apparatus including a deposition mask and a frame that supports the deposition mask. The frame supports the deposition mask in a taut state so that the deposition mask is not bent. The deposition mask is fixed onto the frame by welding, adhering, plating, soldering or crimping. A substrate is placed in such a deposition mask apparatus, and a deposition step is performed. 
     Patent Document 1: JP5382259B 
     Patent Document 2: JP2001-234385A 
     When a substrate is placed in a deposition mask apparatus, there is a possibility that a holding member holding the substrate and a frame interfere with each other. In this case, it is difficult to place the substrate at a desired position, so that a deposition material may not be deposited at a desired position on the substrate. 
     The object of the disclosure is to provide a deposition mask apparatus that can effectively solve such a problem. 
     DISCLOSURE OF THE INVENTION 
     One embodiment of the present disclosure is a deposition mask apparatus to be at least temporarily combined with a substrate held by a holding member, the deposition mask apparatus comprising: a deposition mask having a plurality of mask through-holes extending from a first surface which is positioned closer to the substrate, to reach a second surface which is positioned opposite to the first surface; and a frame provided with an opening which is overlapped with a part of the deposition mask, the frame supporting the deposition mask; wherein: the frame has a front surface facing the second surface of the deposition mask, a rear surface opposed to the front surface, an outside surface spreading between the front surface and the rear surface, and an inside surface spreading inside the outside surface between the front surface and the rear surface to face the opening; and a plurality of accommodation parts capable of accommodating at least a part of the holding member are formed in the front surface of the frame at positions apart from the opening. 
     In the deposition mask apparatus of the embodiment of this disclosure, the plurality of accommodation parts may be formed between the opening and the outside surface. 
     In the deposition mask apparatus of the embodiment of this disclosure, the plurality of accommodation parts may be formed between the opening and the outside surface. 
     In the deposition mask apparatus of the embodiment of this disclosure, the plurality of accommodation parts may extend to reach the outside surface. 
     In the deposition mask apparatus of the embodiment of this disclosure, the front surface of the frame may include a first front surface positioned closer to the inside surface, and a second front surface positioned closer to the outside surface and positioned closer to the rear surface than the first front surface; the first front surface and the second front surface may be connected to each other through an intermediate surface; and the accommodation parts may be formed in the first front surface to extend to reach the intermediate surface. 
     In the deposition mask apparatus of the embodiment of this disclosure, the plurality of accommodation parts may be formed to surround the opening. 
     In the deposition mask apparatus of the embodiment of this disclosure, the deposition mask may include a joint portion welded to the front surface of the frame; and at least a part of the joint portion may be positioned between the opening and the accommodation parts. 
     In the deposition mask apparatus of the embodiment of this disclosure, at least some of the respective accommodation parts may be formed inside a pair of ends in a longitudinal direction of the deposition mask. 
     One embodiment of the present disclosure is a deposition mask apparatus comprising: a deposition mask having a first surface, and a second surface positioned opposite to the first surface; and a frame having a third surface positioned closer to the deposition mask, and a fourth surface positioned opposite to the third surface; wherein: the deposition mask and the frame are joined to each other through a joint portion; the frame further has a fifth surface positioned outside the joint portion; and at least a part of the fifth surface is positioned closer to the fourth surface than the third surface. 
     The present disclosure enables that a substrate is placed at desired position, and that a deposition material is deposited at a desired position on the substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a view showing a deposition apparatus comprising a deposition mask apparatus according to one embodiment of the present disclosure. 
         FIG. 1B  is a sectional view showing an organic EL display device manufactured with the use of the deposition mask apparatus shown in  FIG. 1A . 
         FIG. 2A  is a plan view showing the deposition mask apparatus according to the one embodiment of the present disclosure. 
         FIG. 2B  is a plan view showing a frame of the deposition mask apparatus according to the one embodiment of the present disclosure. 
         FIG. 3  is a plan view showing in enlargement an accommodation part of the frame of the deposition mask apparatus shown in  FIG. 2A . 
         FIG. 4A  is a plan view showing a modification example of a joint portion formed on an ear portion of the deposition mask. 
         FIG. 4B  is a plan view showing a modification example of a joint portion formed on an ear portion of the deposition mask. 
         FIG. 4C  is a plan view showing a modification example of a joint portion formed on an ear portion of the deposition mask. 
         FIG. 4D  is a plan view showing a modification example of a joint portion formed on an ear portion of the deposition mask. 
         FIG. 4E  is a plan view showing a modification example of a joint portion formed on an ear portion of the deposition mask. 
         FIG. 5A  is a sectional view of the deposition mask apparatus seen from the VA-VA direction. 
         FIG. 5B  is a sectional view showing in enlargement the deposition mask apparatus shown in  FIG. 5A  (a sectional view corresponding to the VB part of  FIG. 5A ). 
         FIG. 5C  is a sectional view showing in enlargement a welding taint shown in  FIG. 5B  (a sectional view corresponding to the VC part of  FIG. 5B ). 
         FIG. 5D  is a sectional view showing a modification example of the welding taint. 
         FIG. 5E  is a sectional view showing a modification example of the welding taint. 
         FIG. 6  is a plan view showing in enlargement an intermediate portion of the deposition mask. 
         FIG. 7  is a sectional view of the intermediate portion of  FIG. 6  seen from the VII-VII direction. 
         FIG. 8  is a view showing a step of forming a resist pattern on a metal plate. 
         FIG. 9  is a view showing a first surface etching step. 
         FIG. 10  is a view showing a second surface etching step. 
         FIG. 11  is a view showing a step of removing a resin and the resist pattern from the metal plate. 
         FIG. 12A  is a step of manufacturing a frame. 
         FIG. 12B  is a step of manufacturing the frame. 
         FIG. 13A  is a view showing a step of depositing a deposition material onto an organic EL substrate. 
         FIG. 13B  is a view showing a step of depositing the deposition material onto the organic EL substrate. 
         FIG. 14A  is a view showing a step of depositing the deposition material onto the organic EL substrate. 
         FIG. 14B  is a view showing a step of depositing the deposition material onto the organic EL substrate. 
         FIG. 15  is a sectional view showing a modification example of the ear portion of the deposition mask. 
         FIG. 16  is a plan view showing a modification example of a deposition mask apparatus. 
         FIG. 17A  is a plan view showing a modification example of the deposition mask apparatus. 
         FIG. 17B  is a sectional view showing a step of installing the organic EL substrate on the frame, in a modification example of the deposition mask apparatus. 
         FIG. 17C  is a plan view showing a modification example of the deposition mask apparatus. 
         FIG. 18  is a plan view showing a modification example of the deposition mask apparatus. 
         FIG. 19  is a plan view showing a modification example of the deposition mask apparatus. 
         FIG. 20  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 21  is a plan view showing a modification example of the deposition mask apparatus. 
         FIG. 22  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the XXII-XXII direction of  FIG. 21 . 
         FIG. 23A  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23B  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23C  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23D  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23E  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23F  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23G  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23H  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23I  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23J  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23K  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 23L  is a plan view showing a modification example of the deposition mask apparatus, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 24  is a plan view showing a modification example of the deposition mask apparatus. 
         FIG. 25A  is a sectional view showing a modification example of a holding member, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
         FIG. 25B  is a sectional view showing a modification example of the holding member, which corresponds to a sectional view seen from the VA-VA direction of  FIG. 3 . 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Herebelow, an embodiment of the present disclosure is described with reference to the drawings. In the drawings attached to the specification, a scale dimension, an aspect ratio and so on are changed and exaggerated from the actual ones, for the convenience of easiness in illustration and understanding. 
     The below-described embodiments are examples of the embodiment of the present disclosure, and the present disclosure should not be limited to these embodiments. In addition, the below embodiments and modification examples can be suitably combined. In addition, it is possible to combine a plurality of embodiments, to combine a plurality of modification examples, and to combine a plurality of embodiments and a plurality of modification examples. 
       FIGS. 1A to 14B  are views for describing an embodiment of the present disclosure. In the below embodiment and the modification example, a manufacturing method of a deposition mask, which is used for patterning an organic material on a substrate in a desired pattern when an organic EL display device is manufactured, is described by way of example. However, not limited thereto, the present disclosure can be applied to a manufacturing method for a deposition mask for various uses. For example, a deposition mask apparatus  10  may be used when a transparent electrode for color filter is formed. 
     In this specification, terms “plate”, “sheet” and “film” are not differentiated from one another based only on the difference of terms. For example, the “plate” is a concept including a member that can be referred to as sheet or film. 
     In addition, the term “plate plane (sheet plane, film plane)” means a plane corresponding to a plane direction of a plate-like (sheet-like, film-like) member as a target, when the plate-like (sheet-like, film-like) member as a target is seen as a whole in general. A normal direction used to the plate-like (sheet-like, film-like) member means a normal direction with respect to a plate plane (sheet surface, film surface) of the member. 
     Further, in this specification, terms specifying shapes, geometric conditions and their degrees, e.g., “parallel”, “orthogonal”, “same”, “similar” etc., and values of a length, an angle and a physical property are not limited to their strict definitions, but construed to include a range capable of exerting a similar function. 
     (Deposition Apparatus) 
     Firstly, a deposition apparatus  90  that performs a deposition process in which a deposition material is deposited on an object is described with reference to  FIG. 1A . As shown in  FIG. 1A , the deposition apparatus  90  comprises therein a deposition source (e.g., crucible  94 ), a heater  96 , and a deposition mask apparatus  10 . The crucible  94  accommodates a deposition material  98  such as an organic luminescent material. The heater  96  heats the crucible  94  so as to evaporate the deposition material  98 . The deposition mask apparatus  10  is disposed to be opposed to the crucible  94 . In addition, a substrate, which is an object onto which the deposition material  98  is deposited, e.g., an organic EL substrate  92  is placed on the deposition mask apparatus  10  b a holding member  92 A that holds the organic EL substrate  92 . Herein, the holding member  92 A may be a clamp that clamps the organic EL substrate  92 . 
     (Deposition Mask Apparatus) 
     The deposition mask apparatus  10  is described herebelow. As shown in  FIG. 1A , the deposition mask apparatus comprises a deposition mask  20  and a frame  15  that supports the deposition mask  20 . The frame  15  has an opening  15   a  that overlaps with a part of the deposition mask  20 . The frame  15  supports the deposition mask  20  in a taut state so that the deposition mask is not bent. As shown in  FIG. 1A , the deposition mask apparatus  10  is disposed in the deposition apparatus  90  such that the deposition mask  20  faces a substrate which is an object onto which the deposition material  98  is deposited, such as an organic EL substrate  92 . As described above, the organic EL substrate  92  is placed on the deposition mask apparatus  10  by the holding member  92 A holding the organic EL substrate  92 . In the description below, a surface of the deposition mask  20 , which is closer to the organic EL substrate  92 , is referred to as first make  20   a,  and a surface positioned opposite to the first surface  20   a  is referred to as second surface  20   b.    
     As shown in  FIG. 1A , the deposition mask apparatus  10  may comprise a magnet  93  disposed on a surface of the organic EL substrate  92 , which is opposed to the deposition mask  20 . Due to the provision of the magnet  93 , the deposition mask  20  can be attracted toward the magnet  93  so that the deposition mask  20  can be tightly in contact with the organic EL substrate  92 . 
       FIG. 2A  is a plane view of the deposition mask  10 , the organic EL substrate  92  and the holding member  92 A shown in  FIG. 1A , which are seen from the side of the first surface  20   a  of the deposition mask  20 . As shown in  FIG. 2A , the deposition mask apparatus  10  comprises a plurality of deposition masks  20  having a substantially rectangular shape in plan view. Each deposition mask  20  is fixed on the frame  15  by welding, at below-described joint portions  19  which are positioned near a pair of ends  20   e  in a longitudinal direction of the deposition mask  20 . 
     As shown in  FIG. 1A , the deposition mask  20  includes a plurality of through-holes  25  passing through the deposition mask  20 . The deposition material, which has evaporated from the crucible  94  to reach the deposition mask apparatus  10 , adheres to the organic EL substrate  92  through the through-holes  25  of the deposition mask  20 . Thus, the deposition material  98  can be deposited on the surface of the organic EL substrate  92  in a desired pattern corresponding to the positions of the through-holes  25  of the deposition mask  20 . 
       FIG. 1B  is a sectional view showing an organic EL display device  10  manufactured with the use of the deposition apparatus  90  shown in  FIG. 1A . The organic EL display device  100  comprises the organic EL substrate  92  and patterned pixels containing the deposition material  98 . 
     When colored display by a plurality of colors is desired, the deposition apparatuses  90  provided with deposition masks  20  corresponding to respective colors are respectively prepared, and the organic EL substrate  92  is put into the respective deposition apparatuses  90  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 onto the organic EL substrate  92  in sequence. 
     The deposition process is sometimes performed inside the deposition apparatus  90  in a high-temperature atmosphere. In this case, during the deposition process, the deposition masks  20 , the frame  15  and the organic EL substrate  92 , which are held inside the deposition apparatus  90 , are also heated. At this time, each of deposition mask  20 , the frame  15  and the organic EL substrate  92  develop dimensional change behaviors based on their respective thermal expansion coefficients. In this case, when the thermal expansion coefficients of the deposition mask  20 , the frame  15  and the organic EL substrate  92  largely differ from one another, positioning displacement occurs because of the difference in dimensional change. As a result, the dimensional precision and the positional precision of the deposition material to be adhered to the organic EL substrate  92  lower. 
     In order to avoid this problem, the thermal expansion coefficients of the deposition mask  20  and the frame  15  are preferably equivalent to the thermal expansion coefficient of the organic EL substrate  92 . For example, when a glass substrate is used as the organic EL substrate  92 , an iron alloy containing nickel can be used as a main material of the deposition mask  20  and the frame  15 . For example, an iron alloy containing not less than 30% by mass and not more than 50% by mass of nickel can be used as a material of the metal plate constituting the deposition masks  20 . Concrete examples of an iron alloy containing nickel may be an invar material containing not less than 34% by mass and not more than 38% by mass of nickel, a super invar material containing cobalt in addition to not less than 30% by mass and not more than 34% by mass of nickel, or a low thermal expansion Fe—Ni based plated alloy containing not less than 48% by mass and not more than 54% by mass of nickel. 
     During the deposition step, if the deposition mask  20 , the frame  15  and the organic EL substrate  92  do not reach high temperatures, it is not particularly necessary that the thermal expansion coefficients of the deposition mask  20  and the frame  15  are equivalent to the thermal expansion coefficient of the organic EL substrate  92 . In this case, a material other than the aforementioned iron alloy can be used as a material for forming the deposition mask  20 . For example, it is possible to use an iron alloy other than the iron alloy containing nickel, such as an iron alloy containing chrome. As an iron alloy containing chrome, an iron alloy that is so-called stainless can be used, for example. In addition, it is possible to use alloy other than an iron alloy, such as nickel, or nickel-cobalt alloy. 
     (Frame) 
     Next, the frame  15  is described in detail with further reference to  FIGS. 2B, 3, 5A and 5B , in addition to  FIG. 2A .  FIG. 2B  is a plan view showing the frame  15 .  FIG. 3  is a plan view showing in enlargement a part of the deposition mask  10  shown in  FIG. 2A .  FIG. 5A  is a sectional view of the deposition mask apparatus  10  of  FIG. 3  seen from a VA-VA direction.  FIG. 5B  is a sectional view showing in enlargement the deposition mask apparatus of  FIG. 5A  (a sectional view corresponding to a VB part of  FIG. 5A . As shown in  FIGS. 2A, 2B, 3 and 5B , the frame  15  has a front surface  15   b  (i.e., a third surface) facing the second surface  20   b  of the deposition mask  20 , a rear surface  15   c  (i.e., a fourth surface) opposed to the front surface  15   b,  an outside surface  15   d  spreading between the front surface  15   b  and the rear surface  15   c,  and an inside surface  15   e  spreading between the front surface  15   b  and the rear surface  15   c  to face an opening  15   a.  As shown in  FIG. 5B , when seen in a section along a normal direction N of the first surface  20   a  of the deposition mask  20 , the front surface  15   b  and the rear surface  15   c  extend parallel to each other in a direction orthogonal to the normal direction N. When seen in a section along the normal direction N of the first surface  20   a  of the deposition mask, the outside surface  15   d  and the inside surface  15   e  extend in the normal direction N and connect to the front surface  15   b  and the rear surface  15   c  orthogonally thereto. During the deposition step, the deposition material  98  having evaporated from the crucible  94  adheres to the organic EL substrate  92  through the opening  15   a  of the frame  15 . When seen in a section along the normal direction N of the first surface  20   a  of the deposition mask  20 , the outside surface  15   d  and the inside surface  15   e  of the frame  15  may be inclined from the normal direction N or may be curved. 
     In addition, a plurality of accommodation parts  15   f  may be formed in the surface  15   b  of such a frame  15  at positions apart from the opening  15   a.  The plurality of accommodation parts  15   f  may be posited outside the below-described joint portions  19 , and a surface  151   f  (i.e., a fifth surface) of the accommodation part may be positioned nearer to the rear surface  15   c  (i.e., the fourth surface) of the frame  15  to the front surface  15   b  (i.e., the third surface) thereof. The accommodation part  15   f  is configured to be capable of accommodating at least a part of the holding member  92 A, when the organic EL substrate  92  held by the holding member  92 A is combined with the deposition mask apparatus  10  (see  FIGS. 5A and 5B ). Thus, when the organic EL substrate  92  is placed on the deposition mask apparatus  10 , it can be prevented that the holding member  92 A from interfering with the frame  15 , whereby the organic EL substrate  92  can be placed on a desired position with respect to the deposition mask apparatus  10 . In this embodiment, such an accommodation part  15   f  is constituted by a recess formed in the front surface  15   b.  In this case, a front surface  151   b  of the front surface  15   b,  which is positioned inside the accommodation part  15   f,  and a front surface  152   b  thereof, which is positioned outside the accommodation part  15   f,  are positioned on the same surface, when seen along the normal direction N of the first surface  20   a.    
     In order to prevent interference of the holding member  92 A with the frame  15 , it can be conceived to reduce a width of the frame  15  (a distance between the outside surface  15   d  and the inside surface  15   e ) so that the holding member  92 A does not interfere with the frame  15 , other than the provision of the aforementioned plurality of accommodation parts  15   f.  On the other hand, by discretely providing the front surface  15   b  of the frame  15  with a plurality of the accommodation parts  15   f  capable of accommodating at least a part of the holding member  92 A, parts of the frame  15 , each of which has a thickness S 1  (see  FIG. 5B ) and is free of the accommodation part  15   f,  can be distributed over all the area of the frame  15 . Thus, lowering of strength of the frame  15 , which is caused by providing the frame  15  with the accommodation parts  15   f,  can be prevented. Namely, as compared with a case in which the width of the frame  15  is reduced, a planar dimension of a part of the frame  15 , which has the thickness S 1  (see  FIG. 5B ), can be increased in plan view. Thus, lowering of the strength such as rigidity of the frame  15  can be effectively prevented. As a result, when the frame  15  supports the deposition mask  20  in a taut state, it can be prevented that the frame  15  is deformed such as bent by a force applied from the deposition mask  20 . Therefore, the deposition material  98  can be precisely deposited onto the organic EL substrate  92  with the use of the deposition mask  20  supported on the frame  15 . 
     In  FIG. 5B , the reference numeral S 2  depicts the thickness of the frame  15  at which the accommodation part  15   f  is provided. The thickness S 2  is determined depending on a size of the holding member  92 A, in such a manner that the holding member  92 A can be prevented from interfering with the frame  15 . For example, the thickness S 2  may be not less than 2 mm, not less than 5 mm, not less than 7 mm, or not less than 10 mm. In addition, the thickness S 2  may be not more than 20 mm, not more than 18 mm, not more than 15 mm, or not more than 12 mm. A range of the thickness S 2  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the thickness S 2  may be not less than 2 mm and not more than 20 mm, not less than 5 mm and not more than 18 mm, not less than 7 mm and not more than 15 mm, or not less than 10 mm and not more than 12 mm. In addition, the range of the thickness S 2  may be determined by combining any two of the above upper limit candidate values. For example, the range of the thickness S 2  may be not less than 15 mm and not or than 18 mm. In addition, the range of the thickness S 2  may be determined by combining any two of the above lower limit candidate values. For example, the range of the thickness S 2  may be not less than 7 mm and not more than 10 mm. 
     The thickness S 1  of a part of the frame  15 , which is not provided with the accommodation part  15   f,  is determined so as to prevent deformation such as bending of the frame  15 . For example, the thickness S 1  may be not less than 5 mm, not less than 10 mm, not less than 15 mm, or not less than 20 mm. In addition, the range of the thickness S 1  may be not more than 35 mm, not more than 30 mm, not more than 25 mm, or not more than 20 mm. A range of the thickness S 1  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the thickness S 1  may be not less than 5 mm and not more than 35 mm, not less than 10 mm and not more than 30 mm, or not less than 15 mm and not more than 25 mm. In addition, the range of the thickness S 1  may be determined by combining any two of the above upper limit candidate values. For example, the range of the thickness S 1  may be not less than 20 mm and not or than 30 mm. In addition, the range of the thickness  51  may be determined by combining any two of the above lower limit candidate values. For example, the range of the thickness S 1  may be not less than 10 mm and not more than 15 mm. In addition, the thickness S 1  may be determined depending on the thickness S 2  of the part of the frame  15 , which is provided with the accommodation part  15   f.  For example, the thickness S 1  may be not less than 1.5×S 2  and not more than 3.0×S 2 . 
     Preferably, a ratio (referred to also as an accommodation part ratio herebelow) of a planar dimension of the parts (satin-like parts shown in  FIG. 2B ) at which the plurality of accommodation parts  15   f  are provided relative to a whole planar dimension of the front surface  15   b  of the frame  15  (diagonal-line part shown in  FIG. 2B ) is determined so as to prevent the frame  15  from deforming such as bending. For example, the accommodation part ratio may be not less than 5%, not less than 7%, or not less than 9%. In addition, the accommodation part ratio may be not more than 15%, not more than 13%, not more than 9%, or not more than 11%. A range of the accommodation part ratio may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the accommodation part ratio may be not less than 5% and not more than 15%, not less than 7% and not more than 13%, or not less than 9% and not more than 11%. In addition, the range of the accommodation part ratio may be determined by combining any two of the above upper limit candidate values. For example, the range of the accommodation part ratio may be not less than 11% and not more than 15%. In addition, the rang of the accommodation part ratio may be determined by combining any two of the above lower limit candidate values. For example, the range of the accommodation part ratio may be not less than 5% and not more than 9%. 
     In this embodiment, the plurality of accommodation parts  15   f  may be formed between the outside surface  15   d  and the inside surface  15   e.  To be more specific, the plurality of accommodation parts  15   f  according to this embodiment are formed outside the pair of ends  20   e  of the deposition mask  20 . By forming the plurality of accommodation parts  15   f  between the outside surface  15   b  and the inside surface  15   e,  an area having the thickness S 1  can be ensured outside the accommodation parts  15   f,  whereby lowering of the strength of the frame  15  can be effectively prevented. Herein, as shown by the arrow A in  FIG. 2A , the “outside” means the side which goes away from a centerline CL of the deposition mask  20  in the longitudinal direction of the deposition mask  20 . In addition, the “inside” means the side which comes near to the centerline CL of the deposition mask  20  in the longitudinal direction of the deposition mask  20 . Herein, the centerline CL of the deposition mask is, out of straight lines extending orthogonal to the longitudinal direction of the deposition mask  20 , a straight line that passes an intermediate point C (see  FIG. 2A ) that bisects a distance between the pair of ends  20   e  in the longitudinal direction of the deposition mask  20 . 
     As shown in  FIG. 2A , the plurality of accommodation parts  15   f  are arranged side by side along sides of the opening  15   a  delimited by the inside surface  15   e.  In the example shown in  FIG. 2A , the opening  15   a  has a rectangular shape having four sides, and the plurality of accommodation parts  15   f  are arranged side by side along the pair of sides of the sides of the opening  15   a.  In addition, the plurality of deposition masks  20  are attached to the frame  15  such that their ear portions  17  are arranged side by side along the same side of the opening  15   a  along which the plurality of accommodation parts  15   f  are arranged side by side. Although not shown, the plurality of accommodation parts  15   f  may be arranged side by side along a side the opening  15   a  that is different from the side along which the ear portions  17  of the plurality of deposition masks  20  are arranged side by side. 
     The number and the dimensions of the accommodation parts  15   f  can be suitably determined depending on the dimensions of the holding member  92 A that holds the organic EL substrate  92 , as long as, when the organic EL substrate  92  is installed on the frame  15  (when the organic EL substrate  92  comes into contact with the first surface  20   a  of the deposition mask  20 ), the holding member  92 A does not come into contact with the accommodation parts  15   f.  For example, a length L 1  (length along the longitudinal direction of the deposition mask  20  (see  FIG. 3 )) of the accommodation part  15   f  may be not less than 15 mm and not more than 50 mm, for example, and a width W (length along a width direction of the deposition mask  20  (see  FIG. 3 )) may be not less than 5 mm, not less than 10 mm, not less than 15 mm, not less than 20 mm, or not less than 25 mm. In addition, the width W may be not more than 50 mm, not more than 45 mm, not more than 40 mm, or not more than 35 mm. A range of the width W may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the width W may be not less than 5 mm and not more than 50 mm, not less than 10 mm and not more than 45 mm, or not less than 15 mm and not more than 40 mm. In addition, the range of the width W may be determined by combining any two of the above upper limit candidate values. For example, the range of the width W may be not less than 35 mm and not more than 45 mm. In addition, the range of the width W may be determined by combining any two of the above lower limit candidate values. For example, the range of the width W may be not less than 10 mm and not more than 20 mm. In addition, a distance L 2  (see  FIG. 2A ) between the accommodation parts  15   f  adjacent to each other may, for example, be not less than 50 mm, not less than 80 mm, not less than 100 mm, or not less than 130 mm. In addition, the distance L 2  may be not more than 250 mm, not more than 220 mm, not more than 200, or not more than 180 mm. A range of the distance L 2  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the distance L 2  may be not less than 50 mm and not more than 250 mm, not less than 80 mm and not more than 220 mm, or not less than 100 mm and not more than 200. In addition, the range of the distance L 2  may be determined by combining any two of the above upper limit candidate values. For example, the range of the distance L 2  may be not less than 200 and not more than 220. In addition, the range of the distance L 2  may be determined by combining any two of the above lower limit candidate values. For example, the range of the distance L 2  may be nor less than 130 mm and not more than 150 mm. 
     In  FIG. 2A , a cycle of the plurality of accommodation parts  15   f  arranged side by side along the side of the opening  15   a  corresponds to a cycle of the plurality of deposition masks  20  arranged side by side along the same side of the opening  15   a,  but the present invention is not limited thereto. Although not shown, the cycle of the plurality of accommodation parts  15   f  may differ from the cycle of the plurality of deposition masks  20 . 
     In addition, a distance L 3  (see  FIG. 3 ) from the inside surface  15   e  of the frame  15  to the accommodation part  15   f  may be, for example, not less than 1 mm and not more than 20 mm, and preferably not less than 3 mm and not more than 20 mm. By setting the distance L 3  from the inside surface  15   e  of the frame  15  to the accommodation part  15   f  to be not less than 3 mm, a planar dimension of the joint portion  19  an be sufficiently ensured, whereby the strength of the joint portion  19  can be increased. In addition, by setting the distance L 3  from the inside surface  15   e  of the frame  15  to the accommodation part  15   f  to be not more than 20 mm, a planer dimension of the opening  15   a  can be enlarged, whereby an area effective to deposition can be enlarged. In addition, the distance L 3  from the inside surface  15   e  of the frame  15  to the accommodation part  15   f  may be, for example, not less than 1 mm, not less than 3 mm, not less than 5 mm, or not less than 10 mm. In addition, the distance L 3  may be not more than 20 mm, not more than 18 mm, or not more than 15 mm. A range of the distance L 3  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the distance L 3  may be not less than 1 mm and not more than 20 mm, not less than 3 mm and not more than 18 mm, or not less than 5 mm and not more than 15 mm. In addition, the range of the distance L 3  may be determined by combining any two of the above upper limit candidate values. For example, the range of the distance L 3  may be not less than 15 mm and not more than 18 mm. In addition, the range of the distance L 3  may be determined by combining any two of the above lower limit candidate values. For example, the range of the distance L 3  may be not less than 3 mm and not more than 10 mm. 
     Further, a distance L 4  (see  FIG. 3 ) from the outside surface  15   d  of the frame  15  to the accommodation part  15   f  may be, for example, not less than 10 mm and not more than 80 mm, preferably not less than 30 mm. By setting the distance L 4  from the outside surface  15   d  of the frame  15  to the accommodation part  15   f  to be not less than 30 mm, lowering of the strength of the frame  15  can be prevented. In addition, the distance L 4  from the outside surface  15   d  of the frame  15  to the accommodation part  15   f  may be, for example, not less than 10 mm, not less than 20 mm, not less than 30 mm, or not less than 40 mm. In addition, the distance L 4  from the outside surface  15   d  of the frame  15  to the accommodation part  15   f  may be not more than 80 mm, not more than 70 mm, not more than 60 mm, or not more than 50 mm. A range of the distance L 4  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the distance L 4  may be not less than 10 mm and not more than 80 mm, not less than 20 mm and not more than 70 mm, or not less than 30 mm and not more than 60 mm. In addition, the range of the distance L 4  may be determined by combining any two of the above upper limit candidate values. For example, the range of the distance L 4  may be not less than 50 mm and not more than 80 mm. In addition, the range of the distance L 4  may be determined by combining any two of the above lower limit candidate values. For example, the range of the distance L 4  may be not less than 10 mm and not more than 40 mm. 
     As shown in  FIGS. 2A to 4A , the accommodation part  15   f  has a rectangular shape in plan view. However, the the accommodation part  15   f  may have any shape, for example, a circular shape or an elliptic shape in plan view, or a polygonal shape such as a hexagonal shape or an octagonal shape. In addition, the respective accommodation parts  15   f  may have shapes different from one another. For example, the accommodation parts  15   f  may respectively have a circular shape, an elliptic shape, or a polygonal shape such as a hexagonal shape or an octagonal shape in plan view. In addition, such a accommodation part  15   f  may pass through the frame  15 . In this case, there may be formed an accommodation part  15   f  that passes through the frame  15 , and an accommodation part  15   f  that does not pass through the frame  15 . 
     (Deposition Mask) 
     Next, the deposition mask  20  is described in detail. As shown in  FIG. 2A , the deposition mask  20  comprises a pair of ear portions  17  that constitute a pair of ends  20   e  in the longitudinal direction of the deposition mask  20 , and an intermediate portion  18  that is posited between the pair of ear portions  17 . 
     (Ear Portion) 
     Firstly, the ear portion  17  is described in detail. The ear portion  17  is a part of the deposition mask  20 , which is fixed to the frame  15 . In this embodiment, the ear portion  17  is fixed to the frame  15  by welding, on the side of the second surface  20   b.  In the description below, a part of the ear portion  17  and a part of the frame  15 , which are joined to each other by welding, are referred to as a joint portion  19 . The joint portion  19  may be positioned between the opening  15   a  of the aforementioned frame  15  and the accommodation part  15   f.    
     The joint portion  19  formed in the ear portion  17  includes a welding taint  19   a.  The welding taint  19   a  is a trace formed in the first surface  20   a  of the deposition mask  20 , which is caused by welding the second surface  20   b  of the deposition mask  20  to the frame  15 . For example, as shown in  FIG. 3 , the joint portion  19  includes a plurality of dot-like welding taints  19   a  arranged side by side along the width direction of the deposition mask  20 . Such plurality of dot-like welding taints  19   a  are formed by intermittently applying a laser beam like dots to the ear portion  17  at respective positions along the width direction of the deposition mask  20 . 
     Arrangement and a shape of the welding taint  19   a  in plan view are not specifically limited. For example, as shown in  FIG. 4A , the welding taint  19   a  may extend linearly along the width direction of the deposition mask  20 . For example, such welding taint  19   a  may be formed by continuously applying a laser beam like a line to the ear portion  17  at respective positions along the width direction of the deposition mask  20 . In this case, since the welding taint  19   a  extends linearly along the width direction of the deposition mask  20 , the welding strength can be increased. 
     In addition, for example, as shown in  FIG. 4B , the welding taint  19   a  may include a first welding taint  191   a  formed like a dot and a second welding taint  192   a  formed like a line. In the illustrated example, the welding taint  19   a  includes a plurality of first welding taints  191   a  and a plurality of second welding taints  192   a.  The first welding taints  191   a  and the second welding taints  192   a  are regularly, i.e., alternately arranged among the width direction of the deposition mask  20 . In this case, the shapes of the respective second welding taints  192  may be overlapped with each other, for example. In addition, the number of the first welding taint  191   a  may be only one, and the number of the second welding taint  192   a  may be only one. Also in this case, since the welding taint  19   a  includes the linearly formed second welding taint  192   a,  the welding strength can be increased. 
     In addition, as shown in  FIG. 4C , the first welding taints  191   a  and the second welding taints  192   a  may be irregularly arranged along the width direction of the deposition mask  20 . In the illustrated example, the numbers of the first welding taints  191   a  arranged between the second welding taints  192   a  adjacent to each other in the width direction of the deposition mask  20  differ from each other. Also in this case, the shapes of the respective second welding taints  192   a  may differ from each other, for example. In addition, the numbers of the first welding taints  191   a  arranged between the second welding taints  192   a  adjacent to each other in the width direction of the deposition mask  20  are optional. In this case, the density of the welding taints  19   a  can be selectively increased at a part where the welding density of the deposition mask  20  is desired to be increased. 
     In addition, for example, as shown in  FIG. 4D , a plurality of dot-like welding taints  19   a  may be formed in a plurality of rows along the width direction of the deposition mask  20 . In the illustrated example, the welding taints  19   a  are formed in two rows along the width direction of the deposition mask  20 . However, the welding taints  19   a  may be formed in three rows or in four rows along the width direction of the deposition mask  20 . In this case, since the plurality of dot-like welding taints  19   a  are formed in a plurality of rows along the width direction of the deposition mask, the welding strength can be increased. 
     Further, for example, as shown in  FIG. 4E , the welding taint  19   a  may be formed like a frame along the width direction of the deposition mask  20 . Also in this case, since the welding taint  19   a  is formed along the width direction of the deposition mask  20 , the welding strength can be increased. 
     In addition, as shown in  FIGS. 5A and 5B , the welding taint  19   a  extends from the first surface  20   a  of the ear portion  17  to reach the frame  15  through the second surface  20   b.  The welding taint  19   a  is a part of the ear portion  17  of the deposition mask and the frame  15 , which was melted (i.e., melted area  19   f ) upon welding and is then solidified, and includes a part of the ear portion  17 , which extends from the first surface  20   a  to reach the second surface  20   b,  and a part of the frame  15 . The welding taint  19   a  joins the ear portion  17  of the deposition mask  20  and the frame  15  to each other. In the welding taint  19   a,  when a temperature of the melt area  19   f  lowers after welding so that the melt area  19   f  solidifies, a material crystallizes. For example, the welding taint  19   a  includes crystal grains striding the ear portion  17  and frame  15 . As shown in  FIG. 5C , for example, the welding taint  19  may be formed to project from the first surface  20   a  of the deposition mask  20 . 
     In addition, as shown in  FIG. 5D , the welding taint  19   a  may be formed such that an upper surface  19   b  of the welding taint  19   a  is positioned on the same plane as that of the first surface  20   a  of the deposition mask  20 . Further, as shown in  FIG. 5E , the welding taint  19   a  may be recessed toward the second surface  20   b  with respect to the first surface  20   a  of the deposition mask  20 . In these cases, when the deposition material  98  is deposited onto the organic EL substrate  92 , adhesion between the deposition mask  20  and the organic EL substrate  92  can be improved. 
     In  FIGS. 5A and 5B , the organic EL substrate  92 , which is in tight contact with the deposition mask  20  during the deposition process, is shown by dotted lines. As shown in  FIGS. 5A and 5B , in this embodiment, the organic EL substrate  92  extends outside a part of the deposition mask  20 , at which the joint portion  19  is formed. In addition, when the organic EL substrate  92  is installed on the frame  15 , the organic EL substrate  92  is installed on the frame  15  while it is being held by the holding member  92 A. The holding member  92 A may be detached from the organic EL substrate  92 , when the deposition material  98  is deposited onto the organic EL substrate  92 . 
     Although not shown, as described below, after the deposition mask  20  has been welded to the frame  15 , the ear portion  17  is cut between the opening  15   a  of the frame  15  and the accommodation part  15   f  so as to be partly removed. Thus, in this embodiment, the pair of ends  20   e  in the longitudinal direction of the deposition mask  20  are positioned between the opening  15   a  of the frame  15  and the accommodation parts  15   f.    
     (Intermediate Portion) 
     Next, the intermediate portion  18  is described. As shown in  FIGS. 2A, 3, 5A and 5B , the intermediate portion includes an effective area  22  in which the through-holes  25  extending from the first surface  20   a  to reach the second surface  20   b  are formed, and a peripheral area  23  surrounding the effective area  22 . The peripheral area  23  is an area for supporting the effective area  22 , and is not an area through which the deposition material, which is intended to be deposited onto the organic EL substrate  92 , passes. For example, the effective area  22  is an area of the deposition mask  20 , which faces a display area of the organic EL substrate  92 . 
     As shown in  FIG. 2A , the effective area  22  has a profile of a substantially quadrangular shape in plan view, more precisely a substantially rectangular shape in plan view. Although not shown, each effective area  22  may have a profile of various shapes depending on a shape of the display area of the organic EL substrate  92 . For example, each effective area  22  may have a profile of a circular shape. 
     As shown in  FIG. 2A , the intermediate portion  18  includes a plurality of effective areas  22  that are arranged at predetermined intervals therebetween along the longitudinal direction of the deposition mask  20 . One effective area  22  corresponds to a display area of one organic EL display device  100 . Thus, the deposition mask apparatus  10  shown in  FIG. 1A  enables a multifaceted deposition of the organic EL display devices  100 . 
     The intermediate portion  18  is described in detail below.  FIG. 6  is a plan view showing in enlargement the intermediate portion  18 .  FIG. 7  is a sectional view of the intermediate portion  18  of  FIG. 6  seen from the VII-VII direction. As shown in  FIG. 6 , the plurality of through-holes  25  are arranged in the effective area  22  at predetermined pitches along two directions orthogonal to each other. 
     The effective area  22  is described in detail below.  FIG. 6  is a plan view showing in enlargement the effective area  22  from the side of the second surface  20   b  of the deposition mask  20 . As shown in  FIG. 6 , in the illustrated example, the plurality of through-holes  25  formed in each effective area  22  are arranged at predetermined pitches along two directions orthogonal to each other. 
       FIG. 7  is a sectional view along the VII-VII direction of the effective area  22  of  FIG. 6 . As shown in  FIG. 7 , the plurality of through-holes  25  pass through the deposition mask  20  from the first surface  20   a  of the deposition mask  20  to the second surface  20   b  thereof. In the illustrated example, as shown below in detail, first recesses  30  are formed by etching in a first surface  64   a  of a metal plate  64 , which is one side in the normal direction N of the first surface  20   a  of the deposition mask  20 . Second recesses  35  are formed in a second surface  64   b  of the metal plate e 64 , which is the other side in the normal direction N. Each of the first recess  30  is connected to each of the second recess  35 , so that the second recess  35  and the first recess  30  are formed to communicate with each other. The through-hole  25  is composed of the second recess  35  and the first recess  30  connected to the second recess  35 . As shown in  FIGS. 6 and 7 , a wall surface  31  of the first recess  30  and a wall surface  36  of the second recess  35  are connected through a circumferential hole connection portion  41 . The connection portion  41  defines a through-portion  42  at which a planar dimension of the through-hole  25  is minimum in plan view of the deposition mask  20 . 
     As shown in  FIG. 7 , the adjacent two through-holes  25  in the first surface  20   a  of the deposition mask  20  are spaced apart from each other along the first surface  64   a  of the metal plate  64 . Also on the side of the second surface  20   b  of the deposition mask  20 , the adjacent two through second recesses  35  may be spaced apart from each other along the second surface  64   b  of the metal plate  64 . Namely, the second surface  64   b  of the metal plate  64  may remain between the adjacent two second recesses  35 . In the description below, this portion of the effective area  22  of the second surface  64   b  of the metal plate  64 , which is not etched and thus remains, is also referred to as a top portion  43 . By manufacturing the deposition mask  20  such that such a top portion  43  remains, the deposition mask  20  can have a sufficient strength. Thus, it can be prevented that the deposition mask  20  is damaged during conveyance, for example. However, when a width β of the top portion  43  is too large, there is a possibility that shadow occurs in the deposition step, which lowers utilization efficiency of the deposition material  98 . Thus, the deposition mask  20  is preferably manufactured such that the width β of the top portion  43  is excessively large. 
     When the deposition mask apparatus  10  is received in the deposition apparatus  90  as shown in  FIG. 1A , the first surface of the deposition mask  20  faces the organic EL substrate  92  as shown by two-dot chain lines in  FIG. 7 , and the second surface  20   b  of the deposition mask  20  is positioned on the side of the crucible  94  holding the deposition material  98 . Thus, the deposition material  98  adheres to the organic EL substrate  92  through the second recess  35  whose opening area gradually decreases. As indicated by the arrow in  FIG. 7  extending from the second surface  20   b  toward the first surface  20   a,  the deposition material  98  not only moves from the crucible  94  toward the organic EL substrate  92  along the normal direction N of the organic EL substrate  92 , but also sometimes moves along a direction largely inclined with respect to the normal direction N of the organic EL substrate  92 . At this time, when the thickness of the deposition mask  20  is large, most of the diagonally moving deposition material  98  reaches the wall surface  36  of the second recess  35  to adhere thereto, before the deposition material  98  passes through the through-holes  25  to reach the organic EL substrate  92 . Thus, in order to improve utilization efficiency of the deposition material  98 , it is preferable that the thickness t of the deposition mask  20  is reduced so that heights of the wall surface  36  of the second recess  35  and the wall surface  31  of the first recess  30  are reduced. Namely, it can be said that it is preferable to use the metal plate e 64 , which has the thickness t as small as possible, as long as the strength of the deposition mask  20  is ensured. In consideration of this point, the thickness t of the deposition mask  20  is, for example, not more than 30 μm, preferably not more than 25 μm, or further preferably not more than 20 μm. On other hand, when the thickness of the deposition mask  20  is excessively reduced, the strength of the deposition mask  20  lowers so that the deposition mask  20  is likely to be damaged and/or deformed. In consideration of this point, the thickness t of the deposition mask  20  is preferably not less than 5 μm. The thickness t of the deposition mask may be not less than 8 μm, to less than 10 μm, not less than 12 μm, not less than 13 μm or not less than 15 μm. A range of the thickness t may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the thickness t of the deposition mask  20  may be not less than 13 μm and not more than 15 μm. The thickness t is a thickness of the peripheral area  23 , i.e., a portion of the deposition mask  20 , at which no first recess  30  and no second recess  35  is formed. Thus, it can also be said that the thickness t is a thickness of the metal plate  64 . 
     In  FIG. 7 , a minimum angle defined by a line L 5 , which passes the connection portion  31  having the minimum opening area of the through-hole  25  and another given position of the wall surface  36  of the second recess  35 , with respect to the normal direction N of the deposition mask  20  is represented by a reference numeral θ 1 . In order that the diagonally moving deposition material  98  can be caused to reach the organic EL substrate  92  with being caused to reach the wall surface  36  as much as possible, it is advantageous that the angle θ 1  is increased. In order to increase the angle θ 1 , it is effective to reduce the aforementioned width β of the top portion  43 , as well as to reduce the thickness t of the deposition mask  20 . 
     In  FIG. 7 , the reference numeral a represents a width of a portion (hereinafter referred to also as “rib portion”) of the effective area  22  of the first surface  64   a  of the metal plate  64 , which is not etched and thus remains. A width a of the rib portion and a size r of the through-portion  42  are suitably determined depending on a size of an organic EL display device and the number of display pixels. For example, the width a of the rib portion is not less than 5 μm and not more than 40 μm, and the size r of the through-portion  42  is not less than 10 μm and not more than 60 μm. 
     In  FIGS. 6 and 7 , the second surface  64   b  of the metal plate  64  remains between the adjacent two second recesses  35 , but the present invention is not limited thereto. Although not shown, etching may be performed so that the adjacent two second recesses  35  are connected to each other. Namely, there may be a part where no second surface  64   b  of the metal plate  64  remains between the adjacent two second recesses  35 . 
     Next, a method of manufacturing the deposition mask apparatus  10  is described. Firstly, a method of manufacturing a deposition mask  20  of the deposition mask apparatus  10  is described. 
     Method of Manufacturing Deposition Mask 
     Firstly, a method of manufacturing the deposition mask  20  is described with reference mainly to  FIGS. 8 to 11 . In this embodiment, a plurality of through-holes  25  corresponding to the plurality of deposition masks  20  are formed in the metal plate  64 . In other words, the plurality of deposition masks  20  are allocated to the metal plate  64 . Thereafter, a part of the metal plate  64 , in which the through-holes  25  corresponding to one deposition mask  20  are formed, is separated from the metal plate  64 . In this manner, the sheet-like deposition masks  20  can be obtained. 
     At this time, resist films containing a photosensitive resist material are formed on the first surface  64   a  of the meta plate  64  and the second surface  64   b  thereof. Then, the resist films are exposed and developed. Thus, as shown in  FIG. 8 , a first resist pattern  65   a  can be formed on the first surface  64   a  of the metal plate  64 , and a second resist pattern  65   b  can be formed on the second surface  64   b  of the metal plate  64 . 
     Then, as shown in  FIG. 9 , a first-surface etching step is performed, in which areas of the first surface  64   a  of the metal plate  64 , which are not covered with the first resist pattern  65   a,  are etched by using a first etchant. Thus, a plurality of first recesses  30  are formed in the first surface  64   a  of the metal plate  64 . The first etchant to be used is an etchant containing ferric chloride solution and hydrochloric acid, for example. 
     Then, as shown in  FIG. 10 , a second-surface etching step is performed, in which areas of the second surface  64   b  of the metal plate  64 , which are not covered with the second resist pattern  65   b,  are etched so as to form the second recesses  35  in the second surface  64   b.  The second etching step is performed until the first recess  30  and the second recess  35  are communicated with each other so as to form the through-hole  25 . Similarly to the aforementioned first etchant, a second etchant may be an etchant containing ferric chloride solution and hydrochloric acid, for example. At the second-surface etching step, as shown in  FIG. 10 , the first recesses  30  may be coated with a resin  69  resistant to the second etchant. 
     Thereafter, as shown in  FIG. 11 , the resin  69  is removed from the metal plate  64 . For example, the resin  69  can be removed by using an alkali-based peeling liquid. When the alkali-based peeling liquid is used, as shown in  FIG. 11 , the resist patterns  65   a,    65   b  are removed simultaneously with the removal of the resin  69 . However, after the removal of the resin  69 , the resist patterns  65   a,    65   b  may be removed separately from the resin  69 . 
     Thereafter, by separating a part of the metal plate  64 , in which the through-holes  25  corresponding to one deposition mask  20  are formed, from the metal plate  64 , the deposition mask  20  can be obtained. 
     Next, a method of manufacturing the frame  15  is described. 
     Method of Manufacturing Frame 
     Firstly, a method of manufacturing the frame  15  is described with reference to  FIGS. 12A and 12B . 
     Firstly, as shown in  FIG. 12A , a metal plate  150  is prepared. 
     Then, by machining such as cutting the metal plate  150 , a frame  15  can be obtained. As shown in  FIG. 12B , the frame  15  has a front surface  15   b,  a rear surface  15   c  opposed to the front surface  15   b,  an outside surface  15   d  spreading between the front surface  15   b  and the rear surface  15   c,  and an inside surface  15   e  spreading between the front surface  15   b  and the rear surface  15   c  at a position inside of the outside surface  15   d,  and facing an opening  15   a.  At this time, by machining such as cutting the metal plate  150 , a plurality of accommodation parts  15   f  are formed at positions apart from the opening  15   a  in the front surface  15   b  of the frame  15 . In this manner, the frame  15  is manufactured. The frame  15  may be manufactured with the use of a mold or a 3D printer. 
     Method of Manufacturing Deposition Mask Apparatus 
     Then, a welding step of welding the deposition mask  20  obtained as above to the frame  15  is performed. Thus, the deposition mask apparatus  10  comprising the deposition masks  20  and the frame  15  can be obtained. 
     In this case, the deposition mask  20  is placed on the frame  15 . Then, by a welding apparatus, not shown, a laser beam is applied from the side of the first surface  20   a  of the deposition mask  20 . Thus, as shown in  FIGS. 5A and 5B , a part of the ear portion  17  of the deposition mask  20  and a part of the frame  15  are melt so that a melted area  19   f,  which extends from the first surface  20   a  of the ear portion  17  to reach the frame  15  through the second surface  20   b,  is formed. The melted area  19   f  strides over the ear portion  17  and the frame  15 . 
     For example, as a laser beam, a YAG laser beam generated by a YAG laser system can be used. As a YAG layer system, a system including a crystal of YAG (yttrium aluminum garnet) doped with Nd (neodymium) as an oscillation medium can be used. In this case, laser light with a wavelength of about 1064 nm is generated as the fundamental. In addition, a second harmonic with a wavelength of about 532 nm is produced by passing the fundamental through a nonlinear optical crystal. In addition, a third harmonic with a wavelength of about 355 nm is produced by passing the fundamental and second harmonic through a nonlinear optical crystal. 
     The third harmonic of YAG laser light is likely to be absorbed by an iron alloy containing nickel. Thus, in order to efficiently melt a part of the ear portion  17  of the deposition mask  20  and a part of the frame  15 , the laser beam preferably includes the third harmonic of YAG laser light. 
     After the application of the laser beam has ended, the temperature of the melted area  19   f  lowers, so that the melted area  19   f  solidifies into the welding taint  19   a.  Thus, the ear portion  17  of the deposition mask  20  and the frame are joined to each other by means of the welding taint  19   a.    
     Thereafter, the ear portion of the deposition mask  20  is cut between the opening  15   a  of the frame  15  and the accommodation parts  15   f,  so that a part of the ear portion  17  is removed. 
     Deposition Method of Deposition Material 
     Next, a deposition method of a deposition material in which the deposition material  98  is deposited onto the organic EL substrate  92  with the use of the deposition mask apparatus obtained by the aforementioned steps is described with reference mainly to  FIGS. 13A to 14B . 
     Firstly, the deposition mask apparatus  10  obtained by the aforementioned steps is prepared. Namely, as shown in  FIG. 13A , the deposition apparatus, which comprises the deposition mask apparatus  10 , the crucible  94  containing the deposition material  98 , and the heater  96 , is prepared. 
     Then, as shown in  FIG. 13B , while the organic EL substrate  92  is held by the holding member  92 A, the organic EL substrate  92  is positioned and placed on the frame  15 . In this case, for example, by directly observing an alignment mark, not shown, of the organic EL substrate  92  and an alignment mark, not shown of the deposition mask  20 , the organic the organic EL substrate  92  is positioned such that these alignment marks are overlapped with each other. Alternatively, by means of a not-shown control unit, center position coordinates of the alignment mark of the organic EL substrate  92  and center position coordinates of the alignment mark of the deposition mask  20  may be separately measured, and the organic EL substrate  92  is positioned such that these center position coordinates have a predetermined positional relationship. At this time, as shown in  FIG. 14A , at least a part of the holding member  92 A is accommodated in the accommodation part  15   f  of the frame  15 . Thus, interference between the frame  15  and the holding member  92 A can be prevented, whereby the organic EL substrate  92  is installed at a desired position with respect to the deposition mask apparatus  10 . 
     In addition, the plurality of accommodation parts  15   f  capable of accommodating at least a part of the holding member  92 A are discretely provided in the front surface  15   b  of the frame  15 . Thus, parts of the frame  15 , each of which has a thickness S 1  and is free of the accommodation part  15   f,  can be distributed over all the area of the frame  15 . Thus, lowering of strength of the frame  15 , which is caused by providing the frame  15  with the accommodation parts  15   f,  can be prevented. As a result, it can be prevented that the frame  15  is deformed such as bent by a force applied from the deposition mask  20 . Therefore, the deposition material  98  can be precisely deposited onto the organic EL substrate  92  with the use of the deposition mask  20  supported on the frame  15 . 
     In addition, the plurality of accommodation parts  15   f  are formed between the outside surface  15   d  and the inside surface  15   e.  Thus, in the front surface  15   b  of the frame  15 , an area having the thickness S 1  can be ensured outside the accommodation parts  15   f,  whereby lowering of the strength of the frame  15  can be effectively prevented. 
     Then, the deposition material  98  is deposited onto the organic EL substrate  92  installed on the frame  15 . At this time, as shown in  FIG. 14B , a magnet  93  is disposed on a surface of the organic EL substrate  92 , which is opposed to the deposition mask  20 . By providing the magnet  93 , the deposition mask  20  is attracted toward the magnet  93  by a magnetic force, so that the deposition mask  20  can be brought into tight contact with the organic EL substrate  92 . Then, the heater  96  heats the crucible  94  to evaporate the deposition material  98 . Then, the deposition material  98  evaporated from the crucible  94  to reach the deposition mask apparatus  10  adheres to the organic EL substrate  92  through the through-holes  25  of the deposition mask  20  (see  FIG. 1A ). At this time, the holding member  92 A may be removed from the organic EL substrate  92 . 
     In this manner, the deposition material  98  can be deposited onto the organic EL substrate  92  in a desired pattern corresponding to the positions of the through-holes  25  of the deposition mask  20 . 
     According to this embodiment, the plurality of accommodation parts  15   a  capable of accommodating at least a part of the holding member  92 A are formed at positions of the front surface  15   b  of the frame  15  apart from the opening  15   a.  Thus, when the organic EL substrate  92  is installed on the deposition mask apparatus  10 , the holding member  92 A can be prevented from interfering with the frame  15 . In addition, since the accommodation parts  15   f  are formed at positions apart from the opening  15   a,  the joint portion  19  can be ensured, whereby the welding strength of the joint portion  19  of the deposition mask  20  can be increased. Further, the plurality of accommodation parts  15   f  are formed in the front surface  15   f  of the frame  15 . Namely, an area having the thickness S 1  can be ensured between the plurality of accommodation parts  15   f,  and parts of the frame  15 , each of which has a thickness S 1  and is free of the accommodation part  15   f,  can be distributed over all the area of the frame  15 . Thus, lowering of strength of the frame  15 , which is caused by providing the frame  15  with the accommodation parts  15   f,  can be prevented. As a result, it can be prevented that the frame  15  is deformed such as bent by a force applied from the deposition mask  20 . Therefore, the deposition material  98  can be precisely deposited onto the organic EL substrate  92  with the use of the deposition mask  20  supported on the frame  15 . 
     In addition, according to this embodiment, the plurality of accommodation parts  15   f  are formed between the opening  15   a  and the outside surface  15   d.  Thus, in the front surface  15   b  of the frame  15 , an area having the thickness S 1  can be ensured outside the accommodation parts  15   f,  whereby lowering of the strength of the frame  15  can be effectively prevented. 
     The aforementioned embodiment can be variously modified. Hereinbelow, modification examples are described with reference to the drawings according to need. In the below description and the drawings used in the below description, a part that can be similarly constituted to the above embodiment has the same reference numeral as that of corresponding part the above embodiment, and overlapped description is omitted. In addition, when the effect obtained by the aforementioned embodiment is apparently obtained in the modification examples, description thereof is possibly omitted. 
     (Modification Example of Manufacturing Method of Deposition Mask) 
     In the aforementioned embodiment and the modification example, the example in which the deposition mask  20  is manufactured by etching is described. However, a method employed for manufacturing the deposition mask  20  is not limited to etching. For example, as disclosed in the aforementioned Patent Document 2, the deposition mask  20  can be manufactured by forming the through-holes  25  in a metal plate by a plating process. 
     (Modification Example of Ear Portion) 
     In the aforementioned embodiment and the modification example, the thickness of the ear portion  17  of the deposition mask  20  and the thickness of the intermediate portion  18  are the same with each other. However, not limited thereto, the thickness of the ear portion  17  and the thickness of the intermediate portion  18  may differ from each other. For example, as shown in  FIG. 15 , the thickness of the ear portion  17  may be greater than the thickness of the intermediate portion  18 . In addition, although not shown, the thickness of the ear portion  17  may be smaller than the thickness of the intermediate portion  18 , for example. 
     (First Modification Example of Frame) 
     In the aforementioned embodiment, the example in which the plurality of accommodation parts  15   f  of the frame  15  are formed between the opening  15   a  and the outside surface  15   d  is described. However, not limited thereto, as shown in  FIG. 16 , the plurality of accommodation parts  15   f  may extend to reach the outside surface  15   d.  Also in this case, since the plurality of accommodation parts  15   f  are provided to be spaced apart from each other, lowering of the strength of the frame  15  can be prevented. 
     (Second Modification Example of Frame) 
     In the aforementioned embodiment and the modification example, the example in which the plurality of accommodation parts  15   f  of the frame  15  are formed between the opening  15   a  and the outside surface  15   d  is described. However, not limited thereto, as shown in  FIG. 17A , the plurality of accommodation parts  15   f  may be formed to surround the opening  15   a.  Namely, the opening  15   a  may have a rectangular shape having four sides, and the plurality of accommodation parts  15   f  may be arranged side by side along the four sides of the opening  15   a.  In addition, in this case, in the aforementioned step of installing the organic EL substrate  92  on the frame  15 , the holding member  92 A may hold the four sides of the organic EL substrate  92 . 
     In the step of installing the organic EL substrate  92  on the frame  15 , there is a possibility that air enters between the organic EL substrate  92  and the deposition mask  20 , resulting in bending of the organic EL substrate  92 . In this case, it is difficult to deposit the deposition material  98  onto desired positions of the organic EL substrate  92 . 
     On the other hand, according to this embodiment, since the plurality of accommodation parts  15   f  are formed to surround the opening  15   a,  in the step of installing the organic EL substrate  92  on the frame  15 , the holding member  92 A holds the four sides of the organic EL substrate  92 . Thus, entering of air between the organic EL substrate  92  and the deposition mask  20  can be prevented. Namely, as shown in  FIG. 17B , since the holding member  92 A holds the four sides of the organic EL substrate  92 , the organic EL substrate  92  bends by this own weight such that a part near the center of the organic EL substrate  92  is positioned most downward. In this case, when the organic EL substrate  92  comes into contact with the deposition mask  20 , the organic EL substrate  92  can be brought into contact with the deposition mask  20  such that the organic EL substrate  92  and the deposition mask  20  are in point contact with each other. By gradually lowering the organic EL substrate  92  while the holding member  92 A holds the four sides of the organic EL substrate  92 , entering of air between the organic EL substrate  92  and the deposition mask  20  can be prevented. In addition, in the step of installing the organic EL substrate  92  on the frame  15 , bending of the organic EL substrate  92  can be reduced, so that the organic EL substrate  92  can be stably transported. At the same time, risk of damage of the organic EL substrate  92  can be reduced. In particular, even when the organic EL substrate  92  is of a large size (e.g., G5.5Q size, or G6H size) or the organic EL substrate  92  has only a thickness of not more than 0.5 mm, the organic EL substrate  92  can be stably transported, and the risk of damage of the organic EL substrate  92  can be reduced. 
     In addition, in this case, as shown in  FIG. 17C , no accommodation part  15   f  may be provided in four corners of the frame  15 . The four corners of the frame  15  mean areas surrounded by virtual lines X obtained by extending the four sides of the opening  15   a  to reach the outside surface  15   d  of the frame  15  and the outside surface  15   d  in plan view (satin-like areas in  FIG. 17C ). The frame  15  is provided with an alignment mark M for positioning the deposition mask  20  when the deposition mask  20  is joined to the frame  15 . The alignment mark M is provided at a position that is not overlapped with the deposition mask  20  in plan view, after the deposition mask  20  has been joined to the frame  15 . In addition, when the deposition mask  20  is positioned, it is desired that all the effective areas  22  of the deposition mask  20  are disposed at predetermined positions. In order to facilitate the positioning of all the effective areas  22 , the alignment marks M are preferably provided on four corners of the frame  15 . Thus, as in this modification example, since no accommodation parts  15   f  is provided in four corners of the frame  15 , the alignment marks M can be reliably formed on four corners of the frame  15 , whereby the deposition mask  20  can be easily positioned. 
     (Third Modification Example of Frame) 
     In the aforementioned embodiment and the modification examples, the example in which the deposition mask apparatus  10  uses the plurality of deposition masks  20  that are allocated to the frame  15  is described. However, not limited thereto, as shown in  FIG. 18 , the deposition mask apparatus  10  may use a single deposition mask  20  having a plurality of effective areas  22  that are arranged like a grid. 
     (Fourth Modification Example of Frame) 
     In the aforementioned embodiment and the modification examples, the example in which parts of the frame  15 , each of which has the thickness S 1 , are distributed over all the area of the frame  15  is described. However, not limited thereto, as shown in  FIGS. 19 and 20 , the front surface  15   b  of the frame  15  may include a first front surface  15   g  positioned closer to the inside surface  15   e  and a second front surface (i.e., fifth surface)  15   h  positioned closer to the outside surface  15   d  and positioned closer to the rear surface  15   c  than the first front surface  15   g,  the first front surface  15   g  and the second front surface  15   h  may be connected to each other through an intermediate surface  15   i,  and the accommodation parts  15   f  may be formed in the first front surface  15   g  that extend to reach the intermediate surface  15   i.    
     In this case, in the frame  15 , a thickness from the second front surface  15   h  to the rear surface  15   c  is uniformly small as compared with a thickness from the first front surface  15   g  to the rear surface  15   c.  In  FIG. 20 , the reference numeral S 3  depicts a thickness from the second front surface  15   g  to the rear surface  15   c,  and the reference numeral S 4  depicts a thickness from the first front surface  15   h  to the rear surface  15   c.  The thickness S 4  is determined depending on the size of the holding member  92 A such that the holding member  92 A can be prevented from interfering with the frame  15 . For example, the thickness S 4  may be not less than 2 mm, not less than 5 mm, not less than 7 mm, or not less than 10 mm. In addition, the thickness S 4  may be not more than 20 mm, not more than 18 mm, not more than 15 mm, or not more than 12 mm. A range of the thickness S 4  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the thickness S 4  may be not less than 2 mm and not more than 20 mm, not less than 5 mm and not more than 18 mm, not less than 7 mm and not more than 15 mm, or not less than 10 mm and not more than 12 mm. In addition, the range of the thickness S 4  may be determined by combining any two of the above upper limit candidate values. For example, the range of the thickness S 4  may be not less than 15 mm and not more than 18 mm. In addition, the range of the thickness S 4  may be determined by combining any two of the above lower limit candidate values. For example, the range of the thickness S 4  may be not less than 7 mm and not more than 10 mm. 
     The thickness S 3  from the first front surface  15   g  to the rear surface  15   c  is determined to prevent the frame  15  from deforming such as bending. For example, the thickness S 3  may be not less than 5 mm, not less than 10 mm, not less than 15 mm or not less than 20 mm. In addition, the thickness S 3  may be not more than 35 mm, not more than 30 mm, not more than 25 mm, or not more than 20 mm. A range of the thickness S 3  may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the thickness S 3  may be not less than 5 mm and not more than 35 mm, not less than 10 mm and not more than 30 mm, or not less than 15 mm and not more than 25 mm. In addition, the range of the thickness S 3  may be determined by combining any two of the above upper limit candidate values. For example, the range of the thickness S 3  may be not less than 20 mm and not more than 30 mm. In addition, the range of the thickness S 3  may be determined by combining any two of the above lower limit candidate values. For example, the range of the thickness S 3  may be not less than 10 mm and not more than 15 mm. In addition, the thickness S 3  may be determined depending on the thickness S 4  from the second front surface  15   h  to the rear surface  15   c.  For example, the thickness S 4  may be not less than 1.5×S 4  and not more than 3.0×S 4 . 
     Preferably, the ratio (accommodation part ratio) of a planar dimension of a part of the first front surface  15   g  of the frame  15 , in which the plurality of accommodation parts  15   f  are provided, is determined so as to prevent the frame  15  from deforming such as bending. For example, the accommodation part ratio may be not less than 5%, not less than 7%, or not less than 9%. In addition, the accommodation part ratio may be not more than 15%, not more than 13%, not more than 9%, or not more than 11%. A range of the accommodation part ratio may be determined by combining any one of the above upper limit candidate values and any one of the above lower limit candidate values. For example, the range of the accommodation part ratio may be not less than 5% and not more than 15%, not less than 7% and not more than 13%, or not less than 9% and not more than 11%. In addition, the range of the accommodation part ratio may be determined by combining any two of the above upper limit candidate values. For example, the range of the accommodation part ratio may be not less than 11% and not more than 15%. In addition, the rang of the accommodation part ratio may be determined by combining any two of the above lower limit candidate values. For example, the range of the accommodation part ratio may be not less than 5% and not more than 9%. 
     Also in this case, by installing the organic EL substrate  92  on the deposition mask apparatus  10  such that the accommodation parts  15   f  accommodate at least a part of the holding member  92 A or that the holding member  92 A is positioned on the second front surface  15   h  of the frame  15 , it can be prevented that the holding member  92 A from interfering with the frame  15 . 
     (Fifth Modification Example of Frame) 
     In the aforementioned embodiment and the modification examples, the example in which the plurality of accommodation parts  15   f  are formed outside the pair of ends  20   e  of the deposition mask  20  is described. However, not limited thereto, as shown in  FIGS. 21 and 22 , the plurality of accommodation parts  15   f  may be formed inside the pair of ends  20   e  of the deposition mask  20 . In this case, all of the respective accommodation parts  15   f  may be formed inside the pair of ends  20   e  of the deposition mask  20 , or only some of the respective accommodation parts  15   f  may be formed inside the pair of ends  20   e  of the deposition mask  20 . In addition, in this case, the plurality of accommodation parts  15   f  are discretely provided in the front surface  15   b  of the frame  15  so as to be positioned between the plurality of deposition masks  20 . In addition, in this case, the organic EL substrate  92  may not extend outside a part of the deposition mask  20 , at which the joint portion  19  is formed, but may be positioned inside the part at which the joint portion  19  is formed. 
     As described above, after the deposition mask  20  has been welded to the frame  15 , a part of the ear portion  17  is removed. Thus, in the pair of ends  20   e  of the deposition mask  20 , there is a possibility that burr occurs by cutting. When burr occurs in the pair of ends  20   e,  adhesion between the deposition mask  20  and the organic EL substrate  92  is lowered by the burr, which may result in defective deposition. On the other hand, according to this modification example, the plurality of accommodation parts  15   f  are discretely provided in the front surface  15   b  of the frame  15 , such that the plurality of accommodation parts  15   f  are formed inside the pair of ends  20   e  of the deposition mask  20  and are positioned between the plurality of deposition masks  20 . Therefore, the organic EL substrate  92  can be positioned inside the part of the deposition mask  20 , at which the joint portion  19  is formed, so that it can be prevented that the organic EL substrate  92  overlaps with the pair of ends  20   e  of the deposition mask  20 . Thus, even when burr occurs in the pair of ends  20   e  of the deposition mask  20 , lowering of adhesion between the deposition mask  20  and the organic EL substrate  92  by the burr can be prevented, whereby defective deposition can be avoided. 
     (Sixth Modification Example of Frame) 
     In the aforementioned embodiment and the modification examples, the example in which the the front surface  151   b  of the front surface  15   b  of the frame  15 , which is positioned inside the accommodation part  15   f,  and the front surface  152   b  thereof, which is positioned outside the accommodation part  15   f,  are positioned on the same surface, when seen along the normal direction N of the first surface  20   a.  However, the present invention is not limited thereto. As described below, the frame  15  may have various shapes. For example, as shown in  FIG. 23A , the front surface  152   b  of the front surface  15   b  of the frame  15 , which is positioned outside the accommodation part  15   f,  may be positioned closer to the deposition mask  20  than the front surface  151   b  thereof, which is positioned inside the accommodation part  15   f.  In this case, a thickness of a part of the frame  15 , which is positioned outside the accommodation part  15   f,  can be increased, so that the strength of the frame  15  can be increased. In addition, as shown in  FIG. 23B , the front surface  151   b  of the front surface  15   b  of the frame  15 , which is positioned inside the accommodation part  15   f,  may be positioned closer to the deposition mask  20  than the front surface  152   b  thereof, which is positioned outside the accommodation part  15   f.  Also in this case, it can be prevented that the holding member  92 A from interfering with the frame  15 . In addition, as shown in  FIG. 23C , a part of the front surface  152   b  of the front surface  15   b  of the frame  15 , which is positioned outside the accommodation part  15   f,  may be inclined toward the rear surface  15   c  of the frame  15  as it goes outward, when seen along the normal direction N of the first surface  20   a.  In addition, in this case, as shown in  FIG. 23D , a part of the front surface  152   b  of the front surface  15   b  of the frame  15 , which positioned outside the accommodation part  15   f  may have a curvilinear shape, when seen along the normal direction of the first surface  20   a.  Also in this case, it can be prevented that the holding member  92 A from interfering with the frame  15 . 
     In addition, as shown in  FIGS. 23E to 23G , the accommodation part  15   f  may extend to reach the outside surface  15   d,  and the surface  151   f  of the accommodation part  15   f  may be inclined toward the deposition mask  20  as it goes outward. In this case, as shown in  FIG. 23E , when seen along the normal direction N of the first surface  20   a,  an end of the accommodation part  15   f  may be positioned on the same plane as the front surface  151   b  of the front surface  15   b  of the frame  15 , which positioned inside the accommodation part  15   f.  In addition, as shown in  FIG. 23F , the end of the accommodation part  15   f  may be positioned closer to the deposition mask  20  than the front surface  151   b  of the front surface  15   b  of the frame  15 , which positioned inside the accommodation part  15   f.  In this case, a part of the surface  151   f  (i.e., fifth surface) of the accommodation part  15   f  may be positioned closer to the deposition mask  20  than the front surface  151   b  of the front surface  15   b  of the frame  15 , which positioned inside the accommodation part  15   f.  In addition, as shown in  FIG. 23G , a part of the surface  151   f  (i.e., fifth surface) of the accommodation part  15   f  may be positioned closer to the rear surface  15   c  of the frame  15  than the front surface  151   b.  Also in this case, it can be prevented that the holding member  92 A from interfering with the frame  15 . 
     In addition, as shown in  FIG. 23H , the accommodation part  15   f  may include an inclined portion (see dotted lines in  FIG. 23H )  152   f  which is inclined toward the deposition mask  20  as it goes inward. In this case, at the accommodation part  15   f  of the frame  15 , the thickness of the frame  15  can be increased, whereby the strength of the frame  15  an be increased. In addition, also in this case, as shown in  FIG. 23I , the plurality of accommodation parts  15   f  may extend to reach the outside surface  15   d.  Also in this case, at the accommodation part  15   f  of the frame  15 , the thickness of the frame  15  can be increased, whereby the strength of the frame  15  an be increased. In addition, as shown in  FIG. 23J , when seen along the normal direction N of the first surface  20   a,  the inclined portion  152   f  may be formed to smoothly connect to the front surface  15   b  of the frame  15  and the surface  151   f  of the accommodation part  15   f.  In addition, as shown in  FIG. 23K , when seen along the normal direction N of the first surface  20   a,  the inclined portion  152   f  may have a wavelike form. Further, as shown in  FIG. 23L , when seen along the normal direction N of the first surface  20   a,  the inclined portion  152   f  may have a curvilinear shape. 
     (Seventh Modification Example of Frame) 
     In addition, as shown in  FIG. 24 , a plurality of the holding members  92 A may be accommodated in one accommodation part  15   f.  In the illustrated example, two holding members  92 A are accommodated in one accommodation part  15   f.  The number of the holding members  92 A to be accommodated in one accommodation part  15   f  may be three or more. When the plurality of holding members  92 A are accommodated in one accommodation part  15   f,  a planar dimension of each accommodation part  15   f  in plan view can be increased, and the number of the accommodation parts  15   f  can be decreased. Thus, a step of manufacturing the frame  15  can be facilitated. 
     (Modification Example of Holding Member) 
     In the aforementioned embodiment and the modification examples, the example in which the holding member  92 A is a clamp that clamps the organic EL substrate  92  is described. However, the present invention is not limited thereto. For example, as shown in  FIG. 25A , the holding member  92 A may be configured to support one of surfaces of the organic EL substrate  92 , which is on the side of the deposition mask  20 , without clamping the organic EL substrate  92 . Also in this case, the holding member  92 A can hold the organic EL substrate  92 . In this case, as shown in  FIG. 25B , the holding member  92 A may include an adhesive member  921  for adhering the organic EL substrate  92  to the holding member  92 A. In this case, since the organic EL substrate  92  can be adhered to the holding member  92 A, the holding member  92 A can effectively hold the organic EL substrate  92 .