Abstract:
An attachment member and a solar cell array are disclosed. The attachment member includes a first member; a second member on the first member; and a fixing member that fixes the first and second members. The first member includes a bottom portion; two first side walls facing each other. The second member includes a top portion; two second side walls facing to each other. The first and the second side walls are alternately arranged and face to each other. Each of the first and second side walls comprises an engagement portion. The engagement portion of one of the first side walls adjustably engages in height direction with the engagement portion of one of the second side walls. The engagement portion of the other one of the first side walls adjustably engages in height direction with the engagement portion of the other one of the second side walls.

Description:
TECHNICAL FIELD 
     The present invention relates to attachment members for a solar cell module and a solar cell array using the attachment members. 
     BACKGROUND ART 
     A solar cell array includes attachment members and a plurality of solar cell modules fixed to the attachment members. A roof of a house or another installation surface to which the solar cell array is installed may be distorted. Thus, when a plurality of attachment members are installed, the height of the attachment members may be adjusted. In order to address this, a solar cell array equipped with engagement portions for adjusting the height of the attachment members has been proposed (see Patent Literature 1). 
     CITATION LIST 
     Patent Literature 
     PTL 1: Japanese Unexamined Patent Application Publication No. 2006-57357 
     SUMMARY OF INVENTION 
     In the solar cell array described in Patent Literature 1, a square pipe-shaped second member is disposed in a first member having a substantially U-shaped section, and a hook portion of the first member is hooked in a recess of the second member. In this state, the first member and the second member are fixed to each other with a screw inserted therethrough. Thus, in order to adjust the height of the attachment members, the screw needs to be removed from the first and second members, the second member needs to be removed from the first member, and then, the second member needs be inserted again. This makes installation work complex. 
     An object of the present invention is to provide an attachment member, which facilitates height adjustment, for a solar cell module and a solar cell array using the attachment member. 
     An attachment member according to an embodiment of the present invention includes a first member, as second member on the first member. The first member includes a bottom portion and two first side wall portions. The two first side wall portions face each other and extend upward from the bottom portion. The second member includes a top portion faces the bottom portion and two second side wall portions that face each other, and that extend downward from the upper portion. The attachment member further includes a fixing member that fixes the second member to the first member. In the attachment member, the two first side wall portions and the two second side wall portions are alternately arranged such that a main surface of one of the two first side wall portions faces a main surface of a corresponding one of the two second side wall portions and a main surface of the other one of the two first side wall portion faces a main surface of the other one of the two second side wall portions. At least one of the two first side wall portions includes a first engagement portion in the main surface thereof that faces a corresponding one of the two second side wall portions. At least one of the two second wall portions includes a second engagement portion, which is engaged with the first engagement portion, on the main surface thereof that faces a corresponding one of the two first side wall portions. The second engagement portion is engageable with the first engagement portion at a plurality of positions in a height direction of the first member. 
     A solar cell array according to another embodiment of the present invention includes a plurality of solar cell modules arranged in one direction such that the solar cell modules are not superposed with one another and the above-described attachment member disposed between, out of the plurality of solar cell module, two solar cell modules adjacent to each other in the one direction. 
     The height of an attachment member is easily adjustable with the above-described attachment member and the solar cell array using the above-described attachment member. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  includes the following views of an example of a solar cell array according to a first embodiment of the present invention: view (a) that is a perspective view; view (b) that is a sectional view taken along line A-A′ in view (a) of  FIG. 1 ; and view (c) that is an enlarged view of part B in view (a) of  FIG. 1 . 
         FIG. 2  includes the following views of an example of a solar cell module used in the solar cell array illustrated in  FIG. 1 : view (a) that is a plan view; and view (b) that is sectional view taken along line C-C′ in view (a) of  FIG. 2 . 
         FIG. 3  includes the following views of an attachment member used in the solar cell array illustrated in  FIG. 1 : view (a) that is an exploded perspective view; view (b) that is an exploded perspective view illustrating the attachment member illustrated in view (a) of  FIG. 3  seen from the rear side; view (c) that is a perspective view; and view (d) that is a sectional view taken along line D-D′ in view (c) of  FIG. 3 . 
         FIG. 4  is an enlarged view of part of the attachment member according to the first embodiment illustrating a section take along line E-E′ in view (c) of  FIG. 3 . 
         FIG. 5  includes sectional views (a) to (c) taken at a position corresponding to section F-F′ in view (a) of  FIG. 1  explaining installation steps of the attachment member according to the first embodiment in the order from (a) to (c). 
         FIG. 6  includes sectional views (a) to (d) explaining installation steps of the solar cell array according to the first embodiment in the order from (a) to (d). 
         FIG. 7  is an exploded perspective view of an attachment member used in a solar cell array according to a second embodiment. 
         FIG. 8  is an exploded perspective view of an attachment member used in a solar cell array according to a third embodiment. 
         FIG. 9  includes the following views of an attachment member used in a solar cell array according to a fourth embodiment: view (a) that is a perspective view; and view (b) that is a perspective view of the attachment member illustrated in view (a) of  FIG. 9  seen in the X-direction. 
         FIG. 10  includes sectional views (a) to (c) explaining installation steps of the solar cell array according to the fourth embodiment in the order from (a) to (c). 
         FIG. 11  is a perspective view of an attachment member used in a solar cell array according to a fifth embodiment. 
         FIG. 12  includes sectional views (a) to (c) explaining installation steps of the solar cell array according to the fifth embodiment in the order from (a) to (c). 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     An attachment member for a solar cell module and a solar cell array according to embodiments of the present invention will be described below with reference to the drawings. 
     &lt;First Embodiment&gt; 
     Referring to views (a) and (b) of  FIG. 1 , a solar cell array  1  includes a plurality of solar cell modules  3  and attachment members  4 . The attachment members  4  are used to attach the plurality of solar cell modules  3  onto an installation surface. The solar cell modules  3  are fixed onto, for example, an inclined surface (roof surface) of a base  2  with the attachment members  4 . The base  2  includes shingles  2   a , sheathing roof boards  2   b , and rafters  2   c . That is, this inclined surface serves as the installation surface of the solar cell array  1 . 
     In the present embodiment, as illustrated in view (a) to (c) of  FIG. 1 , the plurality of solar cell modules  3  are arranged in the Y-direction (inclination direction of inclined surface) and in the X-direction, which is perpendicular to the Y-direction. In the following description, an eave side refers to a lower side in the Y-direction and a ridge side refers to an upper side in the Y-direction. That is, the eave side represents the −Y-direction and the ridge side represents the +Y-direction. 
     &lt;Solar Cell Module&gt; 
     As illustrated in  FIG. 2 , each solar cell module  3  includes a solar cell panel  11  and frames  12 . 
     As illustrated in view (b) of  FIG. 2 , the solar cell panel  11  includes a front surface  11   a  (one of main surfaces of a translucent substrate  14 ) and a rear surface  11   b  (one of main surfaces of a rear surface protection member  13 ). Light is mainly received by the front surface  11   a . The rear surface  11   b  is a rear surface of the front surface  11   a . The solar cell panel  11  includes the translucent substrate  14 , a pair of filler members  15 , a plurality of solar cell elements  17 , the rear surface protection member  13 , and a terminal box  18 . 
     The translucent substrate  14  functions as a substrate of the solar cell module  3 . The pair of filler members  15  are formed of, for example, thermosetting resin. Regions around the plurality of solar cell elements  17  are protected by the filler members  15 . The solar cell elements  17  are electrically connected to one another by inner leads  16 . The rear surface protection member  13  protects the rear surface of the solar cell module  3 . Output obtained by the solar cell elements  17  is extracted to the outside through the terminal box  18 . 
     The solar cell elements  17  each use, for example, a substrate formed of a single crystal silicon, a multicrystal silicon, or the like. When such silicon substrates are used, it is sufficient that the silicon substrates adjacent to each other be electrically connected to each other by the inner leads  16  as described above. 
     The type of the solar cell elements  17  is not particularly limited. The solar cell elements  17  use, for example, thin-film solar cells formed of amorphous silicon, CIGS solar cells, CdTe solar cells, solar cells formed of a thin amorphous film stacked on a crystal silicon substrate, or the like. For example, thin-film solar cells formed of amorphous silicon, CIGS solar cells, and CdTe solar cells may be formed by appropriately stacking an amorphous silicon layer, a CIGS layer, and a CdTe layer, respectively, with a transparent electrode and the like on a translucent substrate. 
     The terminal box  18  includes a box body, a terminal plate, and an output cable, which are not shown. The terminal plate is disposed in the box body. Power is output to the outside of the box through the output cable. Examples of the material of the box body include, for example, modified polyphenylene ether resin (modified PPE resin) and polyphenyleneoxide resin (PPO resin). 
     The frames  12  hold the solar cell panel  11 . As illustrated in views (a) and (b) of  FIG. 2 , the frames  12  have an elongated shape and reinforce an outer periphery of the solar cell panel  11 . More specifically, the frames  12  each include an engagement portion  12   a , a frame upper surface  12   b , a frame lower surface  12   c , and a frame side surface  12   d . The engagement portion  12   a  is engaged with the solar cell panel  11  when the solar cell array  1  is installed. The installation of the solar cell array  1  will be described later. The frame upper surface  12   b  is a main surface positioned on a side where sun light is received. The frame lower surface  12   c  is a main surface positioned on a rear surface side of the frame upper surface  12   b . The frame side surface  12   d  is connected to both the frame upper surface  12   b  and the frame lower surface  12   c . Such a frame  12  can be produced by, for example, extruding aluminum. 
     &lt;Attachment Member&gt; 
     In the present embodiment, the attachment members  4  are disposed between corners of the adjacent solar cell modules  3 . For example, as illustrated in view (c) of  FIG. 1 , a single attachment member  4  is disposed at a position where the corners of four solar cell modules  3  meet. 
     The attachment members  4  each include at least, as illustrated in  FIG. 3 , a first member  21 , a second member  22 , and a first fixing member  25 . The second member  22  is disposed on the upper side of the first member  21 . The first fixing member  25  fixes the second member  22  to the first member  21 . The first member  21  and the second member  22  are fixed to the base  2  by screws  27  such that the longitudinal directions of the first member  21  and the second member  22  extend in the Y-direction. In this state, the second member  22  is movable in the Z-direction. 
     In the present embodiment, the attachment member  4  also includes a third member  23  and a fourth member  24 . The third member  23  and the fourth member  24  are movable in at least one of the X-direction and Y-direction. 
     In the present embodiment, as illustrated in views (a) and (b) of  FIG. 3 , the attachment member  4  includes the first member  21 , the second member  22 , the third member  23 , the fourth member  24 , the first fixing member  25 , the second fixing member  26 , screws  27 , and an adhesive member  28 . 
     As illustrated in views (c) and (d) of  FIG. 3 , the first member  21  and the second member  22  are combined with each other and fixed with the first fixing member  25  in the combined state. The fourth member  24  is disposed on the third member  23 . The third member  23  and the fourth member  24  are fixed onto the second member  22  with the second fixing member  26 . Thus, an assembly of the first to fourth members  21  to  24  is obtained. This assembly is fixed to the installation surface (surface of base  2 ) with the screws  27 . 
     The adhesive member  28  is disposed between the first member  21  and the base  2 . The gap between the first member  21  and the base  2  can be sealed with the adhesive member  28 . Thus, the amount of rain water and the like penetrating into the base  2  along the screws  27  can be reduced. 
     &lt;First Member&gt; 
     As illustrated in  FIG. 3 , the first member  21  is, for example, an elongated member having a substantially U-shaped section. 
     The first member  21  is produced by, for example, extruding a metal such as an aluminum alloy. In the case where a material other than an aluminum alloy is used, the first member  21  is produced by, for example, roll forming or bending a stainless steel, a galvanized steel sheet, or the like. 
     The first member  21  includes, for example, a bottom portion  21   a , first through holes  21   b , two first wall portions  21   c , and a first slotted hole  21   e . The first member  21  is disposed such that the longitudinal direction of the first member  21  extends in the Y-direction. 
     The bottom portion  21   a  opposes the base  2  (inclined surface). 
     The first through holes  21   b  are formed in the bottom portion  21   a . The screws  27  are inserted through the first through hole  21   b . The attachment member  4  is fixed to the base  2  (inclined surface) by using the first through holes  21   b . In the present embodiment, as illustrated in view (b) of  FIG. 3 , two first through holes  21   b  are arranged in the longitudinal direction (Y-direction) of the first member  21 . 
     The two first wall portions  21   c  each extend upward from the bottom portion  21   a . The two first wall portions  21   c , for example as illustrated in  FIG. 3 , extend in a direction perpendicular to the bottom portion  21   a  from both end portions of the bottom portion  21   a  in the X-direction. It is sufficient that the size in the Z-direction of the first wall portions  21   c  be, for example, 40 to 80 mm. As illustrated in view (d) of  FIG. 3 , the two first wall portions  21   c  each include a first main surface  21   k   1  and a second main surface  21   k   2 . The two first wall portions  21   c  each include a first engagement portion  21   d  in the first main surface  21   k   1 . That is, the first engagement portions  21   d  are formed in the respective first main surfaces  21   k   1  (surfaces on the +X-direction side in view (c) of  FIG. 3 ), which face the same direction, out of the main surfaces of the two first wall portions  21   c.    
     In the present embodiment, the first engagement portions  21   d  each are a first serration in the first main surface  21   k   1  of the first wall portion  21   c . That is, as illustrated in  FIG. 4 , the sectional shape of the first engagement portion  21   d  along the XZ plane has a serrated shape (sawtooth shape). In other words, the first engagement portion  21   d  includes a plurality of recesses and projections alternately formed in the plus Z-direction in the first main surface  21   k   1 . It is sufficient that the sizes of these recesses and projections in the X- and Z-directions are, for example, 2 to 5 mm. 
     The first slotted hole  21   e  is formed in one of the two first wall portions  21   c  and elongated in the Z-direction. As illustrated in view (c) of  FIG. 3 , the first fixing member  25  inserted through a second through hole  22   e  is inserted through the first slotted hole  21   e . The second through hole  22   e  will be described later. It is sufficient that the size of the first slotted hole  21   e  be appropriately set in accordance with the size of the first fixing member  25 . 
     &lt;Second Member&gt; 
     As illustrated in  FIG. 3 , the second member  22  is, for example, an elongated member having a substantially U-shaped section. The second member  22  can be formed of a material similar to that of the first member with a processing method similar to that of the first member  21 . 
     The second member  22  includes, for example, an upper portion  22   a , an opening portion  22   b , two second wall portions  22   c , and the second through hole  22   e . The second member  22  is disposed on the first member  21  such that the longitudinal direction of the second member  22  extends in the Y-direction. 
     As illustrated in view (c) of  FIG. 3 , the upper portion  22   a  opposes the bottom portion  21   a  of the first member  21  and is disposed above the bottom portion  21   a  of the first member  21 . 
     The opening portion  22   b  is a hole formed in the upper portion  22   a  and elongated in the longitudinal direction of the second member  22 . 
     The second through hole  22   e  is formed at a position of the second wall portion  22   c  in contact with the first slotted hole  21   e  of the first member  21 . 
     The two second wall portions  22   c  each extend downward from the upper portion  22   a . The two second wall portions  22   c  extend, for example, in a direction perpendicular to the upper portion  22   a  (Z-direction) from both end portions of the upper portion  22   a  in the X-direction. It is sufficient that the size in the Z-direction of the second wall portions  22   c  be, for example, 40 to 80 mm. The two second wall portions  22   c  each include a first main surface  22   k   1  and a second main surface  22   k   2 . As illustrated in view (d) of  FIG. 3 , the second main surface  22   k   2  out of the both main surfaces of each second wall portion  22   c  opposes the first main surface  21   k   1  of a corresponding one of the first wall portions  21   c  of the first member  21 . In other words, as illustrated in view (c) of  FIG. 3 , the first wall portions  21   c  and the second wall portions  22   c  are alternately arranged in a single direction (X-direction in the present embodiment). Thus, the second main surfaces  22   k   2  of the second wall portions  22   c  opposes the first main surfaces  21   k   1  of the first wall portions  21   c.    
     The distance between the two second wall portions  22   c  are substantially the same as the distance between the two first wall portions  21   c  of the first member  21 . Thus, when the first member  21  and the second member  22  are combined with each other such that the bottom portion  21   a  of the first member  21  and the upper portion  22   a  of the second member  22  oppose each other, the two first wall portions  21   c  and the two second wall portions  22   c  are alternately arranged while facing one another. In other words, one of the second wall portions  22   c  is in contact with one of the first wall portions  21   c  inside an opening of the first member  21 , and the other second wall portion  22   c  is in contact with the other first wall portion  21   c  outside the opening of the first member  21 . That is, part of the first main surface  21   k   1  of one of the first wall portions  21   c  opposes part of the second main surface  22   k   2  of a corresponding one of the second wall portions  22   c , and part of the first main surface  21   k   1  of the other first wall portion  21   c  opposes part of the second main surface  22   k   2  of a corresponding one of the second wall portions  22   c.    
     Each of the two second wall portions  22   c  includes a second engagement portion  22   d , which is engaged with a corresponding one of the first engagement portions  21   d , in the second main surface  22   k   2 . That is, the second engagement portions  22   d  are formed in the respective second main surfaces  22   k   2  (surfaces on the minus X-direction side in view (c) of  FIG. 3 ), which face the same direction, out of the main surfaces of the two second wall portions  22   c . The second main surfaces  22   k   2  oppose the first main surfaces  21   k   1  of the first wall portions  21   c.    
     As described above, with the second engagement portions  22   d  on the second main surfaces  22   k   2  on the sides in contact with the first engagement portions  21   d , the first engagement portions  21   d  and the second engagement portions  22   d  can be engaged with one another. Thus, the second member  22  can be fixed to the first member  21  in the Z-direction, and a load applied to the attachment member  4  in the Z-direction can be supported by the first engagement portions  21   d  and the second engagement portions  22   d.    
     In the present embodiment, the second engagement portions  22   d  each are a second serration in the second main surface  22   k   2  of the second wall portion  22   c . That is, as illustrated in  FIG. 4 , the sectional shape of the second engagement portion  22   d  along the XZ plane has a serrated shape (sawtooth shape). In other words, the second engagement portion  22   d  includes a plurality of recesses and projections alternately formed in the Z-direction in the second main surface  22   k   2  (surface on the −X-direction in view (c) of  FIG. 3 ). 
     It is sufficient that the shapes of the first engagement portion  21   d  of the first member  21  and the second engagement portion  22   d  of the second member  22  be engageable with each other. That is, although the projection and recess shapes of the second engagement portion  22   d  are similar to those of the first engagement portion  21   d  in the present embodiment, the shapes of the first engagement portion  21   d  and the second engagement portion  22   d  are not limited to these. It is sufficient that the first engagement portion  21   d  and the second engagement portion  22   d  be engageable with each other. 
     The first member  21  and the second member  22  are fixed to each other with the first fixing member  25  so that the first engagement portion  21   d  and the second engagement portion  22   d  are not disengaged from each other. The first fixing member  25  is, for example, as illustrated in view (a) of  FIG. 3 , inserted through the first slotted hole  21   e  and the second through hole  22   e , thereby fixing the first wall portion  21   c  and the second wall portion  22   c  to each other. 
     As described above, in the present embodiment, with the second engagement portions  22   d  on the second main surfaces  22   k   2  on the sides in contact with the first engagement portions  21   d , the first engagement portions  21   d  and the second engagement portions  22   d  can be engaged with one another. Thus, the second member  22  can be fixed to the first member  21  in the Z-direction, and a load exerted on the attachment member  4  in the Z-direction can be supported. In this state, the second engagement portion  22   d  is engageable with the first engagement portion  21   d  at a plurality of positions in the height direction (Z-direction) of the first member  21 . Thus, by loosening the first fixing member  25 , the second member  22  can be moved in the Z-direction without removing the first fixing member  25  and can be set at a desired height position relative to the first member  21 . As a result, with the attachment member  4  that includes the first member  21 , the second member  22 , and the fixing member  25  according to the present embodiment, the solar cell module  3  can be substantially horizontally attached to the installation surface having irregularities. 
     It is sufficient that the first engagement portion  21   d  and the second engagement portion  22   d  be fixed to each other with the first fixing member  25  such that a state in which the first engagement portion  21   d  and the second engagement portion  22   d  are not disengaged from each other can be maintained. That is, the first slotted hole  21   e  and the second through hole  22   e  be respectively formed at least in one of the first wall portions  21   c  and one of the second wall portions  22   c  as is the case with the present embodiment. In other words, it is sufficient that one of the first wall portions  21   c  and a corresponding one of the second wall portions  22   c  be fixed to each other with the first fixing member  25 . This facilitates installation compared to the case where the first fixing member  25  crosses entirely through the sections of the substantially U shapes of the first member  21  and the second member  22  for fixing. Furthermore, reduction in the engagement force due to the sections of the U shapes of the first member  21  and the second member  22  being pressed can be reduced. 
     As described above, in the present embodiment, the first member  21  fixed with the first fixing member  25  includes the first slotted hole  21   e  elongated in the height direction (Z-direction). The first wall portion  21   c  and the second wall portion  22   c  are fixed to each other with the first fixing member  25  inserted through the first slotted hole  21   e . Since the first slotted hole  21   e , through which the first fixing member  25  is inserted, is elongated in the Z-direction as described above, it is ensured that a range of a position where the second member  22  is fixed in the height direction can be increased. 
     Examples of the shapes of the first engagement portion  21   d  and the second engagement portion  22   d  include, for example, a comb-like shape. The first engagement portion  21   d  and the second engagement portion  22   d  each may have a serrated shape. With such forms, the shapes of the first member  21  and the second member  22  are simple. Thus, the processing cost of the attachment member  4  can be reduced. Also with such forms, for example, extruded aluminum can be used. This facilitates production of each member. 
     In the present embodiment, as illustrated in  FIG. 4 , in a section perpendicular to the corresponding wall portions, the first engagement portion  21   d  (first serration) includes horizontal surface portions  211   d   2  and curved surface portions  211   d   1 , and the second engagement portion  22   d  (second serration) includes flat surface portions  221   d   2  and curved surface portions  221   d   1 . With such a structure, a self-weight exerted in the Z-direction on the attachment member  4  can be more stably supported. 
     Furthermore, in the present embodiment, the first engagement portion  21   d  and the second engagement portion  22   d  have an elongated serration shape extending in the Y-direction and are formed of a plurality of projections and recesses. Thus, the first engagement portion  21   d  and the second engagement portion  22   d  are engaged while being in contact with each other is in a large area. That is, since the flat surface portions are in contact with one another, a load to be supported can be distributed. As a result, the self-weight exerted in the Z-direction on the attachment member  4  can be firmly supported. 
     In the present embodiment, part of a surface on an upper side of the upper portion  22   a  of the second member  22  is a support surface  22   g  that supports the third member  23 , which will be described later. The opening portion  22   b  elongated in the Y-direction is formed in this support surface  22   g . As illustrated in view (d) of  FIG. 3 , the second fixing member  26  used to fix the third member  23 , which will be described later, and the fourth member  24  is inserted through the opening portion  22   b . This allows the third member  23  and the fourth member  24  to be moved in the Y-direction. 
     Also in the present embodiment, as illustrated in view (c) of  FIG. 3 , the two second wall portions  22   c  of the second member  22  each include projections  22   f  near positions of each main surface that faces outward, the positions located at both end in the Y-direction. That is, in the second member  22 , one of the second wall portions  22   c  including the second through hole  22   e  includes two projections  22   f  on its first main surface  22   k   1 , and the other second wall portion  22   c  that includes the second engagement portion  22   d  includes two projections  22   f  on its second main surface  22   k   2 . As illustrated in view (b) of  FIG. 3 , such projections  22   f  are interfered with first fins  23   b  of the third member  23 , which will be described later. This can suppress detachment of the third member  23  from the second member  22 . 
     &lt;Third Member&gt; 
     The third member  23  includes a first main surface  23   a , a second main surface  23   d , the first fins  23   b , and second fins  23   e . The first fins  23   b  and the second fins  23   e  are respectively formed on the first main surface  23   a  and the second main surface  23   d.    
     The first main surface  23   a  opposes the second member  22 . The second main surface  23   d  is positioned on the rear side of the first main surface  23   a  and opposes the fourth member  24 , which will be described later. 
     The first fins  23   b  function as guide portions that guide the movement of the third member  23  in the longitudinal direction of the second member  22 . The first fins  23   b  are defined by, for example, a pair of first projections spaced apart from each other and disposed on both side of the first main surface  23   a  in the width direction (X-direction) on the third member  23 . In the present embodiment, two pairs of the above-described first projections are provided. It is sufficient that the distance between the pair of the first projections is equal to or more than the dimension of the second member  22  in the X-direction. 
     The second fins  23   e  function as guide portions that guide the movement of the fourth member  24  in the longitudinal direction (X-direction) of the third member  23 . The second fins  23   e  are defined, for example, by a pair of second projections extending in the longitudinal direction (X-direction) of the third member  23  on the second main surface  23   d . The distance between the pair of the second projections is equal to or more than the dimension of the fourth member  24  in the width direction (Y-direction). 
     As described above, the third member  23  is a plate-shaped body that includes plurality of fins formed in the longitudinal direction on both the main surfaces. With respect to the second member  22 , the third member  23  is disposed such that the longitudinal direction of the third member  23  is perpendicular to the longitudinal direction of the second member  22 . 
     Desirably, the distance between the pair of first projections is substantially the same as the dimension of the second member  22  in the width direction. This allows the third member  23  to be smoothly moved in the Y-direction on the second member  22  without being rotated. Furthermore, misalignment caused by the rotation of the third member  23  can be reduced while tightening the second fixing member  26 . 
     Desirably, the distance between the pair of second projections is substantially the same as the dimension of the fourth member  24  in the width direction. With this, the fourth member  24  allows the second fins  23   e  to be smoothly moved in the longitudinal direction of the third member  23 . 
     The fourth member  24  is moved in a portion between the pair of the second fins  23   e  on the second main surface  23   d . In the second main surface  23   d , a portion outside each of the second fins  23   e  defines a mount portion  23   g  where the solar cell module  3  is mounted. 
     The third member  23  can be formed of a material similar to that of the first member  21  with a processing method similar to that of the first member  21 . 
     &lt;Fourth Member&gt; 
     The fourth member  24  is, for example, a rail having a substantially T-shaped section. The fourth member  24  is disposed such that the longitudinal direction of the fourth member  24  is parallel to the longitudinal direction of the third member  23 . The fourth member  24  is fixed to the third member  23  such that the longitudinal direction of the fourth member  24  is perpendicular to the longitudinal direction of the second member  22 . 
     The fourth member  24  includes, for example, an upper surface portion  24   a , side wall portions  24   c , a third slotted hole  24   b , and pressure fixing portions  24   d . The third slotted hole  24   b  is formed in the upper surface portion  24   a . The pressure fixing portions  24   d  project beyond the side wall portions  24   c.    
     The second fixing member  26  is inserted through the third slotted hole  24   b . The third slotted hole  24   b  is used to fix the third member  23  and the fourth member  24  to each other. The third slotted hole  24   b  allows the movement of the fourth member  24  within the size thereof while the second fixing member  26  remains attached. That is, when the second fixing member  26  is loosened, the fourth member  24  is movable relative to the third member  23 . 
     Before the third member  23  and the fourth member  24  are fixed to each other with the second fixing member  26 , the third member  23  is movable in the Y-direction. Also, the fourth member  24  is movable in the X- and Y-directions. This allows fine adjustment of the position of the solar cell module  3  to be performed in the X- and Y-directions. 
     The pressure fixing portions  24   d  cooperate with the mount portions  23   g  of the third member  23  to clamp the frame  12  of the solar cell module  3 . 
     The fourth member  24  can also be formed of a material similar to that of the first member with a processing method similar to that of the first member  21 . 
     &lt;First Fixing Member&gt; 
     The first fixing member  25  includes, for example, a bolt  25   a , a female thread member  25   b , and the like. The bolt  25   a  is inserted through the first slotted hole  21   e  and the second through hole  22   e  and fixed to the female thread member  25   b . Thus, the second member  22  is movable in the Z-direction when the first fixing member  25  is loosened. The first fixing member  25  may be formed of a stainless steel or a galvanized steel. This improves corrosion resistance of the first fixing member  25 . The female thread member  25   b  can be formed by, for example, pressing or tapping. 
     &lt;Second Fixing Member&gt; 
     The second fixing member  26  includes, for example, a bolt  26   a , a female thread member  26   b , and the like. The bolt  26   a  is inserted through the slotted hole  24   b  and a bolt hole  23   h  and fixed to the female thread member  26   b  at a position further inward than the opening portion  22   b  of the second member  22 . Thus, the third member  23  is movable in the longitudinal direction of the second member  22  (Y-direction) when the second fixing member  26  is loosened. Also, the fourth member  24  is movable in the longitudinal direction of the third member  23  (X-direction). The second fixing member  26  can be formed of a material similar to that of the first fixing member  25  with a processing method similar to that of the first fixing member  25 . 
     &lt;Screw&gt; 
     The screws  27  are inserted through the first through holes  21   b  of the first member  21  and fix the first member  21  to the base  2 . The screws  27  are desirably formed of, for example, a stainless steel or a galvanized steel. 
     &lt;Adhesive Member&gt; 
     The adhesive member  28  is bonded to the bottom portion  21   a  of the first member  21  and protects fixed portions around the screws  27  from rainwater, moisture, or the like when the first member  21  is fixed to the base  2 . The adhesive member  28  is formed of a member having adhesive properties, for example, a silicone sealant sheet or a butyl sheet cut into strips. 
     &lt;Installation Method&gt; 
     Next, a procedure for installing the solar cell array  1  according to the embodiment of the present invention is described. 
     Initially, positions on the base  2  where the attachment members  4  are to be installed are marked with ink or the like. Next, the first members  21  are aligned with the above-described marks, bonded to the base  2  with the adhesive members  28 , and fixed to the base  2  with the screws  27 . 
     Next, the first members  21  and the second members  22  are loosely fixed with the first fixing member  25 . Next, the second members  22 , the third members  23 , and the fourth members  24  are loosely fixed with the second fixing members  26 . Thus, the attachment members  4  are assembled. In this state, the first engagement portions  21   d  and the second engagement portions  22   d  are desirably engaged with one another such that the second members  22  are positioned at the lowest position relative to the respective first members  21 . 
     Next, leveling lines are stretched between the attachment members  4  positioned at both ends of rows of the attachment members  4  arranged in a direction (X-direction) perpendicular to the inclination direction of the base  2 . The height of the attachment members  4  arranged in each row other than those positioned at both the ends of the row is adjusted with reference to the leveling lines. 
     A procedure in which the height of the mount portions  23   g  of the third members  23  in the attachment members  4  is adjusted is described in detail below with reference to  FIG. 5 . 
     &lt;Method of Adjusting Height&gt; 
     Initially, the first fixing member  25  in the attachment member  4  illustrated in view (a) of  FIG. 5  is loosened, and, as illustrated in view (b) of  FIG. 5 , the first engagement portions  21   d  and the second engagement portions  22   d  are disengaged from one another. Next, the position (position in the Z-direction) of the second member  22  is shifted upward, and the height of the second member  22  is adjusted. 
     By doing this, as illustrated in view (b) of  FIG. 5 , the first engagement portions  21   d  and the second engagement portions  22   d  can be disengaged from one another without removing the first fixing member  25  from the first slotted hole  21   e . Thus, according to the present embodiment, the engagement portions corresponding to one another are disengaged from one another by loosening the fixing member (first fixing member  25 ). This allows the height of the attachment member  4  to be adjusted without removing the second member  22  from the first member  21 . 
     Furthermore, in the present embodiment, since the first engagement portions  21   d  and the second engagement portions  22   d  include unevenness, even when the first fixing member  25  is lightly hand-tightened, the second member  22  can be temporarily fixed in the Z-direction. This facilitates adjustment in the height direction. 
     Next, as illustrated in view (c) of  FIG. 5 , the first engagement portions  21   d  and the second engagement portions  22   d  are engaged with one another at a desired height, and after that, the second member  22  is fixed to the first member  21  with the first fixing member  25 . 
     The height of the attachment members  4  according to the present embodiment can be easily adjusted even on an inclined surface such as a roof where performing a task is comparatively difficult. Thus, working time taken to install the solar cell array  1  can be reduced. 
     &lt;Method of Adjustment in X/Y-Directions&gt; 
     Next, a procedure in which fixing positions of the third member  23  and the fourth member  24  in the X- and Y-directions are adjusted is described in detail below with reference to  FIG. 6 . 
     As illustrated in view (a) of  FIG. 6 , with the second fixing member  26  of the attachment member  4   a , which is in the first row from the eave side of the base  2 , the positions of the second member  22 , the third member  23 , and the fourth member  24  are fixed. At this time, adjustment is made so that the fourth member  24  is positioned between the solar cell modules  3  adjacent to each other in the X-direction (see view (c) of  FIG. 1 ). Next, the eave-side frame  12  of the solar cell module  3   a  is inserted into a gap between the pressure fixing portion  24   d  and the mount portion  23   g.    
     At this time, the gap between the pressure fixing portion  24   d  and the mount portion  23   g , between which the eave-side frame  12  of the solar cell module  3   a  is clamped, may be slightly larger than the eave-side frame  12 . This allows the solar cell module  3   a  to be inserted without loosening the second fixing member  26 . 
     Next, as illustrated in view (b) of  FIG. 6 , the solar cell module  3   a  is turned toward the base  2 , and the frame  12  of the solar cell module  3   a  is placed on the mount portion  23   g  of the attachment member  4   b  positioned in the second row. 
     Next, as illustrated in view (c) of  FIG. 6 , the third member  23  of the attachment member  4   b  in the second row is moved in the Y-direction toward the eave side while the position of the attachment member  4   b  in the X-direction is adjusted so that the attachment member  4   b  is positioned between the solar cell modules  3  adjacent to each other. Next, the ridge side of the solar cell module  3   a  is clamped between the pressure fixing portion  24   d  and the mount portion  23   g  of the attachment member  4   b.    
     Next, the second fixing member  26  of the attachment member  4   b  in the second row is firmly tightened, thereby fixing the ridge side of the solar cell module  3   a  with the attachment member  4   b.    
     The installation of the solar cell modules  3  in the second row and rows after the second row is performed in a method similar to the method with which the solar cell modules  3  in the first row is installed, and description thereof is omitted (see view (d) of  FIG. 6 ). 
     As described above, according to the present embodiment, the solar cell modules  3  can be fixed to the attachment members  4  by placing the solar cell modules  3  on the second members  22 , moving the third members  23  and the fourth members  24  in the Y-direction, and then tightening the second fixing members  26 . By doing this, the solar cell modules  3  can be fixed to the attachment members  4  without an operator moving onto the solar cell modules  3 . This reduces damage to the solar cell elements  17  of the solar cell module  3   a.    
     &lt;Second Embodiment&gt; 
     As illustrated in  FIG. 7 , in an attachment member  42  used in a solar cell array according to a second embodiment of the present invention, the structures of the first engagement portions  21   d  and the second engagement portions  22   d  are different from those of the first embodiment. 
     More specifically, as illustrated in  FIG. 7 , the first wall portions  21   c  of the first member  21  include a plurality of projections  212   d  as the first engagement portions  21   d  on the first main surfaces  21   k   1 . The plurality of projections  212   d  are arranged in the height direction (Z-direction). The second wall portions  22   c  of the second member  22  include a plurality of hole portions  222   d  as the second engagement portions  22   d . The hole portions  222   d  penetrate through the first main surfaces  22   k   1  and the second main surfaces  22   k   2 . The plurality of projections  212   d  are arranged in the height direction (Z-direction) on each wall portion. Each projection  212   d  corresponds to a corresponding one of the plurality of hole portions  222   d . That is, the numbers of the projections  212   d  and the hole portions  222   d  are equal to each other, and the distance between the adjacent projections  212   d  is substantially the same as the distance between the adjacent hole portions  222   d . The projections  212   d  are engageable with the hole portions  222   d.    
     As described above, the first engagement portions  21   d  and the second engagement portions  22   d  may alternatively be a combination of the projections and hole portions engageable with one another. With such a form, the engagement forces of the first engagement portions  21   d  with the second engagement portions  22   d  are increased. That is, a supporting force resisting the self-weight of the attachment member  4  in the Z-direction is increased. It is sufficient that the height in the X-direction and width in the Y-direction of such projections be, for example, 2 to 5 mm and 3 to 7 mm, respectively. Also, it is sufficient that the shape of the projections be, for example, a square bar shape, cylindrical shape, or the like. 
     In the present embodiment, the hole portions may instead be formed in the first wall portions  21   c  and the projections engageable with the hole portions may instead be formed on the second wall portions  22   c.    
     &lt;Third Embodiment&gt; 
     As illustrated in  FIG. 8 , in an attachment member  43  used in a solar cell array according to a third embodiment of the present invention, the structures of the first engagement portions  21   d  and the second engagement portions  22   d  are different from those of the first embodiment. 
     More specifically, as illustrated in  FIG. 8 , in the solar cell array according to the present embodiment, the first wall portions  21   c  of the first member  21  include hook portions  213   d  as the first engagement portions  21   d  on the first main surfaces  21   k   1 . The hook portions  213   d  project from each of the first main surfaces  21   k   1  toward the second main surface  22   k   2  of a corresponding one of the second wall portions  22   c . The second wall portions  22   c  of the second member  22  include through portions  223   d  as the second engagement portions  22   d  in the second main surfaces  22   k   2 . The through portions  223   d  correspond to the hook portions  213   d  and extend in the height direction (Z-direction). The through portions  223   d  each include a plurality of engagement regions  223   d   1  arranged in the height direction. The hook portions  213   d  are engaged with the engagement regions  223   d   1 . 
     With such a structure, the first engagement portions  21   d  and the second engagement portions  22   d  can be disengaged from one another by loosening the first fixing member  25  to an extent such as to allow the second member  22  to slide against the first member  21  without significantly shifting the second member  22  in the X-direction. This further improves efficiency of installation. 
     Furthermore, since the first engagement portions  21   d  have a hook shape, the movement of the second member  22  in the X-direction can be restrained and stability of a state in which the first member  21  and the second member  22  are temporarily fixed to each other can be improved in the height adjustment process. As a result, strength of the solar cell array having been installed can be improved. 
     &lt;Fourth Embodiment&gt; 
     Next, a solar cell array according to a fourth embodiment of the present invention is described in detail with reference to  FIGS. 9 and 10 . 
     As illustrated in  FIG. 9 , an attachment member  44  used in the solar cell array according to the present embodiment includes a rail member  29 . The rail member  29  is disposed on the lower side of the first member  21 . As described above, in the present embodiment, the first member  21  is not directly fixed to the base  2 . That is, unlike the first embodiment, the first engagement portions  21   d  and the second engagement portions  22   d  may be omitted from the attachment members  4  disposed in the lowest position and the second lowest position with respect to the base  2 . As is the case with the present embodiment, even when the positions of the first engagement portions  21   d  and the second engagement portions  22   d  are changed from those of the first embodiment, the above-described effects can be obtained. 
     Furthermore, in the present embodiment, the first slotted hole  21   e , which is elongated in the height direction (Z-direction), is formed in the first wall portion  21   c  of the first member  21  similarly to the first embodiment. Furthermore, in the present embodiment, as illustrated in view (a) of  FIG. 9 , a second slotted hole  22   h , which is elongated in the X-direction, is formed in the second wall portion  22   c  of the second member  22  corresponding to the first wall portion  21   c  of the first member  21  that includes the first slotted hole  21   e . Thus, by operating the first fixing member  25 , the position of the second member  22  can be easily adjusted in the X- and Z-directions. 
     Furthermore, the first member  21  includes a guide portion  21   f  in the bottom portion  21   a . The guide portion  21   f  is engaged with the rail member  29 . As illustrated in view (a) of  FIG. 9 , it is sufficient that the guide portion  21   f  be defined by, for example, a notch formed in the bottom portion  21   a  and having the substantially the same dimension as that of the rail member  29  in the width direction (X-direction). With this structure, the first member  21  can be moved on the rail member  29  in the Y-direction, and accordingly, the position of the first member  21  can be adjusted. 
     The second member  22  has a structure on the upper portion  22   a . This structure corresponds to the fourth member  24  of the first embodiment. The second member  22  in the present embodiment includes a pair of second side portions  22   i  and second pressure fixing portions  22   j  that project from the pair of second side portions  22   i . As illustrated in view (a) of  FIG. 10 , one of the second side portions  22   i  of the second member  22  is joined to the upper portion  22   a . The other second side portion  22   i  of the second member  22  is separated from the upper portion  22   a . Out of the pair of second side portions  22   i  of the second member  22 , the second side portion  22   i  joined to the upper portion  22   a  is disposed on the ridge side. The second side portion  22   i  separated from the upper portion  22   a  is disposed on the eave side. 
     In this state, similarly to the first embodiment, the solar cell module  3  is inserted into the gap between the upper portion  22   a  and second pressure fixing portion  22   j . Thus, in the present embodiment, out of the upper portion  22   a , portions positioned outside the pair of second side portions  22   i  function as the support surfaces  22   g  that support the solar cell module  3 . 
     &lt;Installation Method&gt; 
     An installation method in the present embodiment is described below with reference to  FIG. 10 . 
     Initially, as illustrated in view (a) of  FIG. 10 , the ridge-side frame  12  of the solar cell module  3   a  is inserted into a gap between the second pressure fixing portion  22   j  and the support surface  22   g . At this time, the gap between the second pressure fixing portion  22   j  and the support surface  22   g , between which the ridge-side frame  12  of the solar cell module  3   a  is clamped, is desirably slightly larger than the dimension of the frame  12  of the solar cell module  3   a  in the height direction. This allows the solar cell module  3  to be smoothly inserted. 
     Next, as illustrated in view (b) of  FIG. 10 , the second fixing member  26  is tightened. At this time, the second pressure fixing portion  22   j  is bent and inclined toward a side where the second side portion  22   i  and the support surface  22   g  are separated from each other (eave side), thereby clamping and fixing the frame  12  of the solar cell module  3   a.    
     Next, as illustrated in view (c) of  FIG. 10 , the ridge-side frame  12  of the solar cell module  3   b  is inserted into the gap between the second pressure fixing portion  22   j  and the support surface  22   g  of the second member  22 . In this state, as described above, the second pressure fixing portion  22   j  is inclined toward the solar cell module  3   a  side (eave side) because of tightening of the second fixing member  26 . With this structure, the gap between the second pressure fixing portion  22   j  and the support surface  22   g  is larger than the dimension of the frame  12  of the solar cell module  3   b  in the height direction. Thus, the solar cell module  3   b  can be easily inserted. Accordingly, similarly to the first embodiment, installation can be performed without an operator moving onto the solar cell modules  3 . 
     As illustrated in  FIG. 10 , in the present embodiment, the first main surfaces  21   k   1  of the first engagement portions  21   d  and the second main surfaces  22   k   2  of the second engagement portions  22   d  are perpendicular to the inclination direction of the base  2 . Such arrangement of the attachment members  4  on the base  2  allows the self-weight of the solar cell modules  3  exerted on the attachment members  4  to be utilized to increase the engagement forces of the first engagement portions  21   d  with the second engagement portions  22   d.    
     &lt;Fifth Embodiment&gt; 
     As illustrated in  FIGS. 11 and 12 , an attachment member  45  used in a solar cell array according to a fifth embodiment includes a fifth member  30  instead of the third member  23  and the fourth member  24  included in the attachment member  4  of the first embodiment. As illustrated in  FIG. 11 , the attachment member  45  includes the fifth member  30 , which is structured such that the third member  23  and the fourth member  24  in the first embodiment are integrated with each other. 
     The fifth member  30  is elongated in the X-direction. It is sufficient that the dimension of the fifth member  30  in the X-direction be equal to or more than that of the solar cell module  3  in the X-direction. With such a shape, a plurality of the solar cell modules  3  arranged in the X-direction can be fixed by a single fifth member  30 . 
     As illustrated in  FIGS. 11 and 12 , the fifth member  30  includes a void portion  30   a  defined between a pair of plate portions, which are substantially parallel to the bottom portions  21   a  of the first members  21 . Thus, the fifth member  30  includes a pair of third pressure fixing portions  30   b  and a pair of third support surfaces  30   c . In this state, in the fifth member  30 , the pair of third pressure fixing portions  30   b  are joined to one of the plate portions and the pair of third support surfaces  30   c  are joined to the other plate portion. 
     In the present embodiment, by fastening with the second fixing member  26  the fifth member  30  having such a void portion  30   a , a force, with which the frame  12  of the solar cell module  3   a  disposed on the eave side is clamped, is increased. 
     &lt;Installation Method&gt; 
     An installation method in the present embodiment is described below with reference to  FIG. 12 . 
     As illustrated in view (a) of  FIG. 12 , the ridge-side frame  12  of the solar cell module  3  is inserted into a gap between the third pressure fixing portion  30   b  and the third support surface  30   c.    
     At this time, the gap between the third pressure fixing portion  30   b  and the third support surface  30   c , between which the ridge-side frame  12  of the solar cell module  3   a  is clamped, is desirably slightly larger than the dimension of the frame  12  of the solar cell module  3   a  in the height direction. This allows the solar cell module  3  to be inserted without loosening the second fixing member  26 . 
     Next, as illustrated in view (b) of  FIG. 12 , the second fixing member  26  is tightened. At this time, the third pressure fixing portion  30   b  is bent toward a side where the void portion  30   a  is open (eave side), thereby allowing the frame  12  of the solar cell module  3   a  to be clamped and fixed. 
     Then, as illustrated in view (c) of  FIG. 12 , the eave-side frame  12  of the solar cell module  3   b  is inserted into a gap between the third pressure fixing portion  30   b  and the third support surface  30   c  of the attachment member  45 . At this time, since the third pressure fixing portion  30   b  is inclined toward the solar cell module  3   a  side (eave side), the gap between the third pressure fixing portion  30   b  and the third support surface  30   c  is larger than the dimension of the frame  12  of the solar cell module  3   b  in the height direction. This allows the frame  12  of the solar cell module  3   b  to be easily inserted. As a result, also in the present embodiment, installation can be easily performed without an operator moving onto the solar cell modules  3 . 
     The solar cell module  3  to which the present invention can be applied is not limited to the super-straight structure solar cell module described in the foregoing embodiments. The present invention can be also applied to solar cell modules of various structures such as a glass package structure solar cell module and a substrate structure solar cell module. 
     The solar cell array  1  according to the present invention can be installed not only on an inclined installation surface but also on a horizontal installation surface. 
     The present invention is not limited to the foregoing embodiments and many modifications and changes can be made within the scope of the present invention. Of course, the present invention includes a variety of combinations of the foregoing embodiments. 
     REFERENCE SIGNS LIST 
       1 : solar cell array 
       2 : base 
       2   a : shingle 
       2   b : sheathing roof board 
       2   c : rafter 
       3 ,  3   a ,  3   b : solar cell module 
       4 ,  42 ,  43 ,  44 ,  45 : attachment member 
       11 : solar cell panel 
       11   a : front surface 
       11   b : rear surface 
       12 : frame 
       13 : rear surface protection member 
       14 : translucent substrate 
       15 : filler member 
       16 : inner lead 
       17 : solar cell element 
       18 : terminal box 
       21 : first member 
       21   a : bottom portion 
       21   b : first through hole 
       21   c : first wall portion 
       21   d ,  211   d ,  212   d ,  213   d : first engagement portion 
       211   d   1 : curved surface portion 
       211   d   2 : horizontal surface portion 
       21   e : first slotted hole 
       21   f : guide portion 
       21   k : main surface 
       21   k   1 : first main surface 
       21   k   2 : second main surface 
       22 : second member 
       22   a : upper portion 
       22   b : opening portion 
       22   c : second wall portion 
       22   d ,  221   d ,  222   d ,  223   d : second engagement portion 
       221   d   1 : curved surface portion 
       221   d   2 : flat surface portion 
       223   d   1 : engagement region 
       22   e : second through hole 
       22   f : projection 
       22   g : support surface 
       22   h : second slotted hole 
       22   i : second side portion 
       22   j : second pressure fixing portion 
       22   k : main surface 
       22   k   1 : first main surface 
       22   k   2 : second main surface 
       23 : third member 
       23   a : first main surface 
       23   b : first fin 
       23   d : second main surface 
       23   e : second fin 
       23   g : mount portion 
       23   h : bolt hole 
       24 : fourth member 
       24   a : upper surface portion 
       24   b : third slotted hole 
       24   c : side wall portion 
       24   d : pressure fixing portion 
       25 : first fixing member 
       25   a : bolt 
       25   b : female thread member 
       26 : second fixing member 
       26   a : bolt 
       26   b : female thread member 
       27 : screw 
       28 : adhesive member 
       29 : rail member 
       30 : fifth member 
       30   a : void portion 
       30   b : third pressure fixing portion 
       30   c : third support surface