Abstract:
Provided are a display apparatus and a television receiving apparatus with which safety may be assured while a casing is segmented. A display apparatus comprises: a display unit having a display screen in the front side thereof; a front cabinet which encompasses the peripheral edge part of the display unit; and a back cabinet which covers the rear side of the display unit. The back cabinet is formed from a back cabinet main body ( 41 ) in which an aperture ( 41   a ) is disposed, and a cover which is attached to the back cabinet main body ( 41 ) to close off the aperture ( 41   a ). The cover is configured from a material which differs from the material which configures the back cabinet main body ( 41 ).

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/JP2012/063010 which has an International filing date of May 22, 2012 and designated the United States of America. 
     
    
     FIELD 
       [0002]    The present application relates to a display apparatus and a television receiving apparatus such as a liquid crystal television, a plasma television or the like. 
       BACKGROUND 
       [0003]    A thin type display apparatus such as a thin type television, or the like has a casing including a front cabinet and a back cabinet, which cover a display unit. The back cabinet may be divided into a plurality of members for improving transportability, facilitating assembly or the like. (For example, see Japanese Patent Laid-open Publication No. 2009-171520 and Japanese Patent Laid-open Publication No. 2008-216347). 
         [0004]    By the way, as the size of the thin type display apparatus becomes larger, it is necessary for a larger molding machine to mold the casing with rapidity. If it fails to introduce a new large molding machine into a system of producing the thin type display apparatus in time, the casing is divided into a plurality of members and each of the divided casing members is molded by an existing molding machine. 
       SUMMARY 
       [0005]    Meanwhile, in order to protect human life and properties from fire and other safety accidents, safety standards for fire protection and, mechanical and electrical protection relating to products and equipment have been defined. Therefore, even if the casing of the display apparatus is divided into a plurality of members, it is necessary to clear the safety standards such as those for fire protection and the like. 
         [0006]    In consideration of the above-mentioned circumstances, it is an object of the present invention to provide a display apparatus and a television receiving apparatus capable of ensuring safety while dividing a casing thereof. 
         [0007]    A display apparatus according to the present application including: a display unit having a display surface on a front side of the display unit; a front cabinet enclosing a peripheral edge part of the display unit; and a back cabinet covering a back side of the display unit, wherein the back cabinet includes a back cabinet body provided with an opening part and a cover body which is attached to the back cabinet body so as to close the opening part, and the cover body is made of a material different from the material constituting the back cabinet body. 
         [0008]    The display apparatus according to the present application includes a display unit, a front cabinet and a back cabinet. The display unit has a display surface on the front side of the display apparatus. The front cabinet encloses the peripheral edge part of the display unit. The back cabinet covers the back side of the display unit. The back cabinet includes a back cabinet body and a cover body. The back cabinet body is provided with an opening part. The cover body is attached to the back cabinet body so as to close the opening part of the back cabinet body. The back cabinet body and the cover body are made of a different material each other. 
         [0009]    If the back cabinet body and the cover body are made of the same material, costs may be increased. When any one of the back cabinet body and the cover body is made of a material having a low grade safety standard, the costs may be reduced. On the other hand, when the other one of the back cabinet body and the cover body is made of a material having a high grade safety standard, safety may be ensured. 
         [0010]    In the display apparatus according to the present application, the cover body may be made of a material having a lower flame retardancy than the back cabinet body. 
         [0011]    In the display apparatus according to the present application, the cover body and the back cabinet body are respectively made of resin materials having different flame retardancy. 
         [0012]    According to the display apparatus of the present application, the cover body is made of a material having a lower flame retardancy than the back cabinet body. In a case that the opening part is located in a region of the back cabinet with a low risk of fire, when the cover body is made of a material having a lower flame retardancy than the back cabinet body, costs may be reduced. On the other hand, when the back cabinet body is made of a material having a high flame retardancy, safety in terms of fire protection may be ensured. 
         [0013]    In the display apparatus according to the present application, may further include a circuit board fixed between the display unit and the back cabinet, wherein the opening part may be provided in a region not facing the circuit board in the back cabinet body. 
         [0014]    According to the display apparatus of the present application, the circuit board is fixed between the display unit and the back cabinet. The opening part of the back cabinet body is provided in the region not facing the circuit board. 
         [0015]    The circuit board is essentially a heating element that may reach a high temperature, if high voltage current is applied thereto. The cover body is a member which covers the opening part provided in the region not facing the circuit board. Therefore, even when the cover body is formed of a material having a low flame retardancy, there is no particular problem in terms of fire protection. 
         [0016]    In the display apparatus according to the present application, the opening part may be provided in a region facing the display unit in the back cabinet body, and the back cabinet body may include an inner cylinder and an outer cylinder enclosing the inner cylinder, which are formed on a front surface of a periphery of the opening part. 
         [0017]    According to the display apparatus of the present application, the opening part is provided in the region of the back cabinet body facing the display unit. An inner cylinder and the outer cylinder enclosing the inner cylinder are formed on the front surface of the peripheral edge of the opening part in the back cabinet body. 
         [0018]    The front surface of the peripheral edge of the opening part is an inner surface of the display apparatus. The outer cylinder provided on the inner surface of the display apparatus serves as an enclosure that isolates a space inside of the opening part from the inside of the display apparatus having the possibility of fire. The inner cylinder located on the inside of the outer cylinder also serves as an additional enclosure. Therefore, a safety space for fire protection may be secured in the opening part. In addition, even when a user removes the cover body from the back cabinet and contacts the inner cylinder wall surface which is the inner peripheral surface of the opening part, safety in terms of burning of the user may be secured. 
         [0019]    In the display apparatus according to the present application, the cover body may include a plurality of locking claws provided on the peripheral edge part of the front surface of the cover body to be locked to a peripheral wall end of the inner cylinder. 
         [0020]    According to the display apparatus of the present application, a plurality of locking claws are provided on the peripheral edge part of the front surface of the cover body to be locked to a peripheral wall end of the inner cylinder. 
         [0021]    When the locking claws provided on the cover body are locked to the peripheral wall end of the inner cylinder provided on the back cabinet body, the cover body is fixed to the back cabinet body around the opening part to close the opening part. 
         [0022]    In the display apparatus according to the present application, the locking claw may have a base provided on the front surface of the cover body, and a reinforcing rib provided on a corner forming the inner surface of the base and the front surface of the cover body. 
         [0023]    According to the display apparatus of the present application, the locking claw has a base and a reinforcing rib. The base is provided on the front surface of the cover body. The reinforcing rib is provided on the corner forming the inner surface of the base and the front surface of the cover body. The reinforcing rib serves to reinforce the base of the locking claw, thereby it is possible to increase the strength of the locking claw. 
         [0024]    In the display apparatus according to the present application, an opening surface of the outer cylinder, the opening part and the cover body may be formed in a rectangular shape, respectively, the cover body may include a positioning protrusion which is provided on one long side surface of the cover body to position the cover body in line with the back cabinet body, the outer cylinder may include an aperture which is provided in one peripheral wall facing the positioning protrusion in a longitudinal direction of the outer cylinder to be loosely inserted into the positioning protrusion, the outer cylinder may have a guide protrusion which is provided on an inner surface of the peripheral wall of the outer cylinder around the aperture to guide the positioning protrusion into the aperture, the guide protrusion may have a concave provided on the rear surface of the guide protrusion, and the inner cylinder may be provided on the peripheral edge of the opening part including an inner periphery of the guide protrusion. 
         [0025]    According to the display apparatus of the present application, the opening surface of the outer cylinder, the opening part and the cover body are formed in a rectangular shape, respectively. The cover body includes a positioning protrusion which is provided on one long side surface of the cover body to position the cover body in line with the back cabinet body. The outer cylinder facing the positioning protrusion includes an aperture which is provided in one peripheral wall in a longitudinal of the outer cylinder to be loosely inserted into the positioning protrusion. The one peripheral wall of the outer cylinder has a guide protrusion which guides the positioning protrusion into the aperture. The guide protrusion has a concave provided on a rear surface of the guide protrusion. 
         [0026]    If the concave of the guide protrusion provided around the aperture of the outer cylinder guides the positioning protrusion of the cover body, the positioning protrusion may be inserted into the aperture of the outer cylinder provided on the peripheral edge of the opening part. Therefore, when the cover body is attached to the back cabinet body, it is possible to facilitate the positioning process and the attaching process of the cover body in line with the back cabinet body. Since the inner periphery of the guide protrusion is included on the peripheral edge of the opening part, the peripheral wall of the inner cylinder is inwardly overhung in the portion of the guide protrusion. 
         [0027]    The television receiving apparatus according to the present application including: the above display apparatus; and a receiving unit which receives television broadcasts, wherein the display apparatus displays an image of the television broadcasts received by the receiving unit. 
         [0028]    The television receiving apparatus according to the present application, the television receiving apparatus includes the above display apparatus and a receiving unit. The display apparatus displays an image of the television broadcasts received by the receiving unit. Therefore, it is possible to ensure the safety such as the fire protection, and the like, even when the back cabinet of the television receiving apparatus is divided into a plurality of members. 
         [0029]    According to the display apparatus of the present application, it is possible to ensure the safety while dividing the casing thereof. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0030]      FIG. 1  is a schematic perspective view of a television receiving apparatus. 
           [0031]      FIG. 2  is a plan view illustrating an example of an assembled display unit and a front cabinet as seen from a rear side of the television receiving apparatus. 
           [0032]      FIG. 3  is a plan view illustrating an example of a back cabinet as seen from the rear side of the television receiving apparatus. 
           [0033]      FIG. 4  is a schematic perspective view illustrating the example of the back cabinet. 
           [0034]      FIG. 5A  is a plan view illustrating a back cabinet body as seen from the rear side of the television receiving apparatus. 
           [0035]      FIG. 5B  is a plan view illustrating a cover as seen from the rear side of the television receiving apparatus. 
           [0036]      FIG. 6  is a schematic perspective view illustrating an example of a back cabinet body. 
           [0037]      FIG. 7  is a plan view illustrating an example of the cover as seen from the rear side of the television receiving apparatus. 
           [0038]      FIG. 8  is a plan view illustrating the example of the cover as seen from a front side of the television receiving apparatus. 
           [0039]      FIG. 9  is a schematic perspective view illustrating the example of the cover. 
           [0040]      FIG. 10  is a schematic perspective view illustrating the example of the cover. 
           [0041]      FIG. 11A  is a plan view of a plate-shaped protrusion provided on a center of one upper long side end face of the cover. 
           [0042]      FIG. 11B  is a plan view of a plate-shaped protrusion provided near a side end of the one upper long side end face of the cover. 
           [0043]      FIG. 12  is a schematic perspective view illustrating an example of the plate-shaped protrusion. 
           [0044]      FIG. 13  is a partial enlarged view illustrating near a periphery of an opening part in the underside surface of the back cabinet body. 
           [0045]      FIG. 14  is a schematic perspective view illustrating an example of a peripheral edge part of the opening part in the assembled back cabinet body and cover. 
           [0046]      FIG. 15  is a partial enlarged view illustrating near the opening part edge in the upper side surface of the back cabinet body. 
           [0047]      FIG. 16  is a view for explaining a state during attaching the cover to the back cabinet body. 
           [0048]      FIG. 17A  is a perspective view of a locking claw as seen obliquely from the upper right of a tip portion side thereof. 
           [0049]      FIG. 17B  is a perspective view of the locking claw as seen obliquely from the upper right of the tip portion side thereof in another angle. 
           [0050]      FIG. 17C  is a perspective view of the locking claw as seen obliquely from the upper left of a side opposite to the tip portion side. 
           [0051]      FIG. 18  is a cross-sectional view illustrating an example of the locking claw. 
           [0052]      FIG. 19A  is a view for explaining a state before locking the locking claw of the cover to an inner cylinder of the back cabinet body. 
           [0053]      FIG. 19B  is a view for explaining a state during locking the locking claw of the cover to the inner cylinder of the back cabinet body. 
           [0054]      FIG. 19C  is a view for explaining a state in which the locking claw of the cover is locked to the inner cylinder of the back cabinet body. 
           [0055]      FIG. 20A  is a view for explaining a part of an upper side surface of the cover corresponding to the locking claw. 
           [0056]      FIG. 20B  is a view illustrating the locking claw added by a hidden double-dashed dotted line in  FIG. 20A . 
           [0057]      FIG. 21  is a partial enlarged view of a periphery of the opening part abutting the locking claw. 
           [0058]      FIG. 22  is a view for explaining a state during assembling the back cabinet. 
           [0059]      FIG. 23  is an enlarged view for explaining a state during assembling the back cabinet. 
           [0060]      FIG. 24  is an enlarged view for explaining a state during assembling the back cabinet. 
           [0061]      FIG. 25  is a view illustrating a peripheral edge part of the opening part and a peripheral edge part of the cover in the back cabinet body as seen from the front side of the television receiving apparatus. 
           [0062]      FIG. 26  is a schematic cross-sectional view illustrating the assembled state in which a positioning rib of the cover contacts with the inner cylinder of the back cabinet body. 
           [0063]      FIG. 27  is an enlarged view for explaining a lower peripheral edge part of the opening part. 
           [0064]      FIG. 28A  is a cross-sectional view illustrating the plate-shaped protrusion and a guide protrusion assembled to the back cabinet. 
           [0065]      FIG. 28B  is a cross-sectional view illustrating the plate-shaped protrusion and a guide protrusion assembled to the back cabinet. 
           [0066]      FIG. 29  is an enlarged perspective view illustrating the peripheral edge part of the underside surface of the cover. 
           [0067]      FIG. 30A  is a cross-sectional view of the back cabinet body and the cover near the peripheral edge part of the opening part. 
           [0068]      FIG. 30B  is a cross-sectional view of the back cabinet body and the cover near the peripheral edge part of the opening part. 
           [0069]      FIG. 31A  is a partial enlarged view illustrating near a corner of the assembled cover. 
           [0070]      FIG. 31B  is a cross-sectional view of the back cabinet body and the cover taken on a cutting line I-I of  FIG. 31A . 
           [0071]      FIG. 32  is an enlarged plan view illustrating an example of the back cabinet body and the cover after assembling as seen from rear side of the television receiving apparatus. 
           [0072]      FIG. 33A  is a perspective view illustrating a hole formed in an upper edge part of the opening part of the back cabinet body as seen obliquely from the rear lower left of the television receiving apparatus. 
           [0073]      FIG. 33B  is a perspective view illustrating a columnar protrusion provided on the peripheral edge part of the underside surface of the cover upside as seen obliquely from the front upper right of the television receiving apparatus. 
           [0074]      FIG. 34A  is a cross-sectional view of an example of the hole and the columnar protrusion. 
           [0075]      FIG. 34B  is a perspective view illustrating the assembled back cabinet body and the cover as seen from the upper side of the cover. 
           [0076]      FIG. 35A  is a plan view illustrating the back cabinet body as seen from the rear side of the television receiving apparatus. 
           [0077]      FIG. 35B  is a plan view illustrating a cover sheet as seen from the rear side of the television receiving apparatus. 
           [0078]      FIG. 36  is a plan view illustrating an example of the back cabinet as seen from the rear side of the television receiving apparatus. 
           [0079]      FIG. 37A  is a plan view illustrating an upper back cabinet as seen from the rear side of the television receiving apparatus. 
           [0080]      FIG. 37B  is a plan view illustrating a lower back cabinet as seen from the rear side of the television receiving apparatus. 
           [0081]      FIG. 38A  is a plan view illustrating the upper back cabinet as seen from the front side of the television receiving apparatus. 
           [0082]      FIG. 38B  is a plan view illustrating the lower back cabinet as seen from the front side of the television receiving apparatus. 
           [0083]      FIG. 39A  is a perspective view illustrating the upper back cabinet as seen obliquely from the rear lower left of the television receiving apparatus. 
           [0084]      FIG. 39B  is a perspective view illustrating the lower back cabinet as seen obliquely from the rear lower left of the television receiving apparatus. 
           [0085]      FIG. 40  is a view for explaining a state during assembling the back cabinet. 
           [0086]      FIG. 41A  is a cross-sectional view for explaining a state before inserting a hook of the lower back cabinet into a pocket of the upper back cabinet. 
           [0087]      FIG. 41B  is a cross-sectional view for explaining a state during inserting the hook of the lower back cabinet into the pocket of the upper back cabinet. 
           [0088]      FIG. 41C  is a cross-sectional view for explaining a state in which the hook of the lower back cabinet is locked to the pocket of the upper back cabinet. 
           [0089]      FIG. 42  is a plan view illustrating an example of the back cabinet as seen from the rear side of the television receiving apparatus. 
           [0090]      FIG. 43  is a plan view illustrating the example of the back cabinet as seen from the front side of the television receiving apparatus. 
           [0091]      FIG. 44  is a perspective view illustrating an example of the back cabinet as seen obliquely from the rear lower left of the television receiving apparatus. 
           [0092]      FIG. 45  is a cross-sectional view illustrating an example of a mold for molding the back cabinet. 
           [0093]      FIG. 46  is a view for explaining a state in which a partition part is overlapped to the back cabinet body. 
           [0094]      FIG. 47  is a cross-sectional view illustrating another example of the mold for molding the back cabinet. 
           [0095]      FIG. 48  is a cross-sectional view illustrating another example of the mold for molding the back cabinet. 
       
    
    
     DETAILED DESCRIPTION 
       [0096]    Hereinafter, a television receiving apparatus according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings illustrating the embodiments thereof. The television receiving apparatus according to the present embodiment includes, for example, a flat-panel such as a liquid crystal display, a plasma display, an organic electro luminescence (EL) display, a surface-conduction electron-emitter display (SED) or the like. Hereinafter, as an example of the television receiving apparatus, a television receiving apparatus provided with the liquid crystal display will be described. 
         [0097]    Meanwhile, the present invention is not intended to be limited to the following embodiments. 
       Embodiment 1 
       [0098]      FIG. 1  is a schematic perspective view of a television receiving apparatus  1  according to the embodiment of the present invention. Herein, when a viewer faces a display surface  21  of the television receiving apparatus  1  that displays an image, the viewer side of the display surface  21  will be referred to as a front side, and the back side of the display surface  21 , which is the opposite side thereof, will be referred to as a back or rear side. The display surface  21  has a laterally long and substantially rectangular shape, and from a viewer&#39;s position of facing the display surface  21 , the right side of the display surface  21  in a long side direction thereof will be referred to as right, and the left side thereof in the long side direction will be referred to as left. When viewing the television receiving apparatus  1  from the rear side, the left and right sides are opposite to the left and right sides of the front side. Further, from a viewer&#39;s position of facing the display surface  21 , the top side of the display surface  21  in a short side direction thereof will be referred to as upper side, and the bottom side thereof in the short side direction will be referred to as lower side.  FIG. 1  illustrates the television receiving apparatus  1  as seen obliquely from the front upper right. 
         [0099]    The television receiving apparatus  1  includes a display unit  2 , a front cabinet  3 , a back cabinet  4 , a receiving unit T, a power board (a circuit board) P, a drive board (a circuit board) and a stand S. The display unit  2  is a liquid crystal panel module, and includes a liquid crystal panel and a backlight. The liquid crystal panel has the display surface  21  to display an image thereon. The backlight irradiates light from a rear side of the liquid crystal panel. The display unit  2  includes a front peripheral edge part and an outer peripheral surface which are enclosed by the front cabinet  3  of the front side. 
         [0100]    The front cabinet  3  has an aperture  31   a  formed therein with a laterally long rectangular shape, and the display surface  21  of the display unit  2  is exposed through the aperture  31   a . The back cabinet  4  of the rear side of the television receiving apparatus  1  has a substantially flat plate shape, and covers the display unit  2  and a part of the front cabinet  3  from the rear side of the television receiving apparatus  1 . 
         [0101]    The receiving unit T, the power board P and the drive board D are located between the display unit  2  and the back cabinet  4 , and then fixed to the display unit  2  by screwing, for example. The stand S supports the display unit  2 , the front cabinet  3 , the back cabinet  4 , the receiving unit T, the power board P and the drive board D in an upright state. 
         [0102]      FIG. 2  is a plan view illustrating an example of the assembled display unit  2  and the front cabinet  3  as seen from the rear side of the television receiving apparatus  1 .  FIG. 2  illustrates the television receiving apparatus  1  from which the back cabinet  4  and the stand S are removed as seen from the rear side of the television receiving apparatus  1 . Two supporting plates  22  and  23  extending in a vertical direction of the television receiving apparatus  1  are fixed to the rear side of the display unit  2  by screws, for example. 
         [0103]    The supporting plates  22  and  23  are provided with brackets  22   a ,  22   b ,  23   a  and  23   b  having holes which are threaded for the insertion of screws therein. When the television receiving apparatus  1  is fixed to, for example, a wall of a room, the supporting plates  22  and  23  and the brackets  22   a ,  22   b ,  23   a  and  23   b  may be effectively used. 
         [0104]    The receiving unit T receives a video signal relating to television broadcasts. The power board P supplies power to the respective components of the television receiving apparatus  1 . The drive board D includes a panel drive board and a backlight drive board, for example. The panel drive board performs a prescribed signal processing on the video signal relating to the television broadcasts received by the receiving unit T, and then outputs the video signal to the liquid crystal panel after the signal processing. The backlight drive board drives the backlight. 
         [0105]    In addition, when a flammable substance is present near the power board P and the drive board D, there is a possibility of fire from the flammable substance due to a high heat generated by a high voltage applied to the power board P and the drive board D. Herein, the power board P and the drive board D are an example of the heating element included in the television receiving apparatus  1 . 
         [0106]      FIG. 3  is a plan view illustrating an example of the back cabinet  4  as seen from the rear side of the television receiving apparatus  1 . 
         [0107]      FIG. 4  is the schematic perspective view illustrating the example of the back cabinet  4 .  FIG. 4  illustrates the back cabinet  4  as seen obliquely from the front upper left of the television receiving apparatus  1 . 
         [0108]    The back cabinet  4  is formed as a substantially rectangular flat plate and made of a synthetic resin, for example. A plurality of screw holes are formed in an outer peripheral edge part of the back cabinet  4 , thereby the back cabinet  4  may be fixed to the display unit  2  or the front cabinet  3  by screws threaded in the screw holes. 
         [0109]    In the present embodiment, the back cabinet  4  is formed by two members.  FIGS. 3 and 4  illustrate the back cabinet  4  assembled by using the two members. 
         [0110]    The back cabinet  4  includes a back cabinet body  41  and a cover  42  (a cover body).  FIG. 5A  is a plan view illustrating the back cabinet body  41  as seen from the rear side of the television receiving apparatus  1 .  FIG. 5B  is a plan view illustrating the cover  42  as seen from the rear side of the television receiving apparatus  1 . The cover  42  is provided with plate-shaped protrusions (positioning protrusions)  42   c  and  42   d  protruding upwardly from one upper long side end face thereof. 
         [0111]    An upper side of the back cabinet body  41  and the cover  42  is referred to as the front. The upper side of the back cabinet body  41  and the cover  42  is the rear side of the television receiving apparatus  1 , and an underside of back cabinet body  41  and the cover  42  is the front side of the television receiving apparatus  1 . 
         [0112]      FIG. 6  is a schematic perspective view illustrating an example of the back cabinet body  41 .  FIG. 6  illustrates the back cabinet body  41  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0113]    The back cabinet body  41  is provided with an opening part  41   a  in an upper center portion thereof. The region provided with the opening part  41   a  is a region not facing the receiving unit T, the power board P and the drive board D, for example, when the back cabinet  4  is fixed to the display unit  2  or the front cabinet  3 . The opening part  41   a  is formed in a laterally long rectangular shape. 
         [0114]    As illustrated in  FIG. 6 , a peripheral edge upper side surface of the opening part  41   a  is lowered into a front side (underside) of the television receiving apparatus  1  with respect to the back cabinet body  41  around an outside thereof, the peripheral edge upper side surface of the opening part  41   a  is a shelf  41   m  having a step. 
         [0115]      FIG. 7  is a plan view illustrating an example of the cover  42  as seen from the rear side of the television receiving apparatus  1 . 
         [0116]      FIG. 8  is a plan view illustrating the example of the cover  42  as seen from the front side of the television receiving apparatus  1 . 
         [0117]      FIGS. 9 and 10  are schematic perspective views illustrating the example of the cover  42 , wherein  FIG. 9  illustrates the cover  42  as seen obliquely from the rear lower left of the television receiving apparatus  1 , and  FIG. 10  illustrates the cover  42  as seen obliquely from the front lower left of the television receiving apparatus  1 . 
         [0118]    The cover  42  is a separate part for covering the opening part  41   a  of the back cabinet body  41 , and is a plate-shaped member formed in a rectangular shape substantially the same as the opening part  41   a . The thickness of the cover  42  is substantially identical to the step of the peripheral edge part of the opening part  41   a  shown in  FIG. 6 . In addition, the size of the cover  42  is slightly smaller than the size of the opening part  41   a.    
         [0119]    Therefore, when the cover  42  is attached to the back cabinet body  41 , the upper side surface (the rear side of the television receiving apparatus  1 ) of the back cabinet body  41  and the cover  42  forms the same plane. In addition, when the cover  42  is attached to the back cabinet body  41 , a groove  43  having a small width is formed between the outer edge of the shelf  41   m  and the periphery of the cover  42  in the peripheral edge part of the opening part  41   a  of the back cabinet body  41  (see  FIG. 3 ). 
         [0120]    Further, the thickness of the cover  42  may be thinner than the thickness of the back cabinet body  41 . 
         [0121]    The cover  42  is temporarily jointed or fixed to the back cabinet body  41  by a claw to be described below. Further, the cover  42  may be fixed to the back cabinet body  41  by screws. Therefore, for example, eight screw through holes  42   a  for screwing are formed in the peripheral edge part of the cover  42  along the periphery of the cover  42 . 
         [0122]    Plate-shaped protrusions  41   b  facing the screw through holes  42   a  are protruded inward of the opening part  41   a  from the peripheral edge part of the opening part  41   a  of the back cabinet body  41  (see  FIGS. 5A and 6 ). In the underside surface (the front side of the television receiving apparatus  1 ) of the protrusion  41   b , bosses (not illustrated) are erected on the underside (the front side of the television receiving apparatus  1 ) to be screwedly connected by the screws inserted in the screw through holes  42   a . The protrusion  41   b  provided on the corner of the opening part  41   a  is formed in a rectangular shape, and the protrusions  41   b  provided on the long side portion of the opening part  41   a  is formed in semicircular shape. 
         [0123]    Four screw through holes  42   b  are arranged in the middle of the cover  42  so as to form respective rectangular vertices which are substantially parallel to and have a substantially similar shape with the periphery of the cover  42 . Two lower screw through holes  42   b  are provided in a substantially center of the rectangular parallelepiped shaped protrusion protruding from the upper side surface of the cover  42 . The screw through holes  42   b  are through holes provided to be threadedly connected with the brackets  22   a ,  22   b ,  23   a  and  23   b  of the supporting plates  22  and  23  fixed to the display unit  2  by screws. 
         [0124]    Meanwhile, regarding the flame retardancy of a resin material, which is one of the safety standards of products and equipment, for example, 5VA, 5VB, V-0, V-1, V-2 and HB grades are defined in the UL94 standards in the order beginning with a material having the highest flame retardancy. It is necessary for a part of the products and equipment which has a potential ignition source or entails a risk of fire to be covered with, for example, an enclosure part with a flame retardancy rating of V-1 or more in terms of the UL94 standards. 
         [0125]    In the UL94 standards, an enclosure part serves to provide fire safety, as well as mechanically and electrically separating the inside and outside of a casing. When satisfying all the following requirements, an enclosure may be certified as satisfying the UL94 standards. 
         [0126]    A fire safety enclosure refers to an enclosure which is a part of equipment and is intended to minimize the spread of flames. 
         [0127]    A mechanical enclosure refers to an enclosure which is a part of equipment, and is intended to reduce mechanical or other physical risks. It is one of the conditions required to prevent an object such as a clip, or the like from entering the products and equipment. 
         [0128]    An electrical enclosure refers to an enclosure which is a part of equipment, and is intended to prevent contact with dangerous voltage and current. 
         [0129]    The back cabinet  4  also serves as an enclosure to provide the fire, mechanical and electrical safety of the television receiving apparatus  1 . Therefore, each of the back cabinet body  41  having a region facing the receiving unit T, the power board P and the drive board D and the cover  42  corresponding to a region not facing the receiving unit T, the power board P and the drive board D is made of a synthetic resin having different flame retardancy, respectively. Specifically, the back cabinet body  41  is made of a synthetic resin with a V-1 rating or more and the cover  42  is made of a synthetic resin with an HB rating or less. 
         [0130]    In a state in which the cover  42  is removed from the back cabinet body  41 , the back cabinet body  41  itself severs as an enclosure. In this case, since the cover  42  is disposed around the enclosure, the UL94 standards defined on the enclosure are not applied to the cover. Therefore, the cover  42  may be made of a material having a lower grade of flame-retardancy. 
         [0131]    These days there is a trend for the size of the television receiving apparatus to become larger. When the television receiving apparatus  1  has a large size or an ultra large size, it is not easy for only one worker to attach the cover  42  to the back cabinet body  41 . Therefore, the cover  42  and the back cabinet body  41  may be provided with a structure for facilitating the assembling work. 
         [0132]    For example, the back cabinet body  41  can be placed on a horizontal plane such that the upper side thereof is faced upward, and then the cover  42  is placed near the opening part  41   a  above the back cabinet body  41 . At this time, in case that the placed position of the cover  42  is shifted from the opening part  41   a , when locking claws  42   e , to be described below, move to a regular position while sliding on the upper side of the back cabinet body  41 , there is a risk of damaging the surface of the back cabinet body  41  by means such as the locking claws  42   e . Therefore, in order to guide the cover  42  to a prescribed position of the opening part  41   a , the cover  42  and the back cabinet body  41  are provided with plate-shaped protrusions (the positioning protrusions)  42   c  and  42   d , as well as a protrusion  41   b  and a guide protrusion  41   f  to be described below, respectively. 
         [0133]    The plate-shaped protrusions  42   c  and  42   d  are protruded upwardly from the one upper long side end face of the cover  42 . When the cover  42  is attached to the back cabinet body  41 , by inserting the plate-shaped protrusions  42   c  and  42   d  in apertures, to be described below, formed in the back cabinet body  41 , one long side of the cover  42  is easily aligned with one long side of the opening part  41   a . At the same time, both short sides of the cover  42  are easily aligned with both short sides of the opening part  41   a . The plate-shaped protrusion  42   c  is protruded on the center of the one upper long side edge face of the cover  42 . Meanwhile, two plate-shaped protrusions  42   d  are protruded near the side edge and closer to a left corner and right corner of the cover  42 , respectively. 
         [0134]      FIG. 11A  is a plan view of the plate-shaped protrusion  42   c  provided on the center of the one upper long side end face of the cover  42 . 
         [0135]      FIG. 11B  is a plan view of the plate-shaped protrusion  42   d  provided near the side end of the one upper long side end face of the cover  42 . In  FIGS. 11A and 11B , the cover  42  provided with the plate-shaped protrusion  42   c  and  42   d  is omitted except a part of the long side. 
         [0136]      FIG. 12  is a schematic perspective view illustrating an example of the plate-shaped protrusion  42   c .  FIG. 12  illustrates the plate-shaped protrusion  42   c  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0137]    The plate-shaped protrusions  42   c  and  42   d  are formed in a plate shape and have a shape obtained by cutting adjacent rectangular corners in a plan view. The plate-shaped protrusions  42   c  and  42   d  are protruded from the upper long side end face of the cover  42  so as to have the cut corners disposed on a tip side. The plate-shaped protrusion  42   c  is larger than the plate-shaped protrusion  42   d . Therefore, in the plate-shaped protrusion  42   c , both of a width substantially parallel to a longitudinal direction of the cover  42  and a length substantially parallel to a short direction of the cover  42  are longer than the width and length of the plate-shaped protrusion  42   d . A base of the upper side surface (the rear side of the television receiving apparatus  1 ) of plate-shaped protrusions  42   c  and  42   d  is provided with one rib  421   c  and one rib  421   d  in the width longitudinal direction of the cover  42 , respectively. When the plate-shaped protrusions  42   c  and  42   d  are inserted in the aperture of the back cabinet body  41 , and the cover  42  is attached to the back cabinet body  41 , the ribs  421   c  and  421   d  have a function to prevent entering of foreign matter into the inside of the television receiving apparatus  1  through the aperture. 
         [0138]    Further, the tip of the plate-shaped protrusions  42   c  and  42   d  may be rounded. 
         [0139]      FIG. 13  is a partial enlarged view illustrating near the periphery of the opening part  41   a  in the underside surface of the back cabinet body  41 .  FIG. 13  illustrates near the center of the upper long side of the opening part  41   a  as seen obliquely from the front upper left of the television receiving apparatus  1 .  FIG. 13  illustrates a state in which the cover  42  is attached to the back cabinet body  41 . 
         [0140]    The center of the underside surface (the front side of the television receiving apparatus  1 ) of the plate-shaped protrusion  42   c  is provided with a rib  422   c  substantially parallel to the short direction of the cover  42 . The rib  422   c  has a function to maintain proper strength of the plate-shaped protrusion  42   c.    
         [0141]    Further, the plate-shaped protrusions  42   d  are also provided with ribs  422   d  similar to the rib  422   c  (see  FIGS. 8 and 10 ). 
         [0142]      FIG. 14  is a schematic perspective view illustrating an example of the peripheral edge part of the opening part  41   a  in the assembled back cabinet body  41  and cover  42 .  FIG. 14  illustrates the opening part  41   a  of the back cabinet body  41  and the peripheral edge part of the cover  42  as seen obliquely from the front upper left of the television receiving apparatus  1 . 
         [0143]    An inner cylinder  41   c  and an outer cylinder  41   d  are erected from the underside surface of the back cabinet body  41  (the front side of the television receiving apparatus  1 ) in the peripheral edge part of the opening part  41   a  toward the front side of the television receiving apparatus  1  (see  FIGS. 13 and 14 ). The inner cylinder  41   c  and the outer cylinder  41   d  are substantially parallel to each other. A region of the upper side surface of the back cabinet body  41  which is opposite to the inner cylinder  41   c  and the outer cylinder  41   d , corresponds to the shelf  41   m  of the peripheral edge of the opening part  41   a  (see  FIG. 6 ). 
         [0144]    The inner cylinder  41   c  is formed to cylinder the periphery around the opening part  41   a . An opening surface of the inner cylinder  41   c  has a substantially rectangular shape similar to the shape of the opening part  41   a . Rectangular or semicircular-shaped protrusions  41   b  to erect the bosses for screwing are protruded from the inner peripheral surface of the outer cylinder  41   d , and the inner cylinder  41   c  is isolated from the outer cylinder  41   d  or overhung inward of the opening part  41   a  in the portion of the protrusions  41   b.    
         [0145]    The outer cylinder  41   d  is disposed on the outside of the inner cylinder  41   c  surrounding the same. The height of the peripheral wall of the outer cylinder  41   d  is higher than the height of the peripheral wall of the inner cylinder  41   c . The outer cylinder  41   d  servers as an enclosure for the cover  42 . 
         [0146]    Notches (not illustrated) are formed in the peripheral wall portion of the outer cylinder  41   d  facing the supporting plates  22  and  23  of the display unit  2 . Notches house the supporting plates  22  and  23  overhung to the rear side of the television receiving apparatus  1 . 
         [0147]      FIG. 15  is a partial enlarged view illustrating near the periphery of the opening part  41   a  in the upper side surface of the back cabinet body  41 .  FIG. 15  illustrates near the center of the upper long side of the opening part  41   a  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0148]      FIG. 16  is a view for explaining the state during attaching the cover  42  to the back cabinet body  41 .  FIG. 16  illustrates near the center of the upper long side of the opening part  41   a  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0149]    An aperture  41   e  is disposed in a position of the outer cylinder  41   d  facing the plate-shaped protrusions  42   c  and  42   d . The aperture  41   e  is formed in a laterally long rectangular shape. The long side of the aperture  41   e  facing the plate-shaped protrusion  42   c  is longer than the width of the plate-shaped protrusion  42   c , and the short side of the aperture  41   e  facing the plate-shaped protrusion  42   c  is longer than the thickness of the plate-shaped protrusion  42   c . Therefore, the plate-shaped protrusion  42   c  can be loosely inserted in the aperture  41   e . Similarly, the plate-shaped protrusion  42   d  is also configured to loosely insert into the aperture  41   e  facing thereto. 
         [0150]    A guide protrusion  41   f  is protruded on the center of one upper peripheral wall of the outer cylinder  41   d . The guide protrusion  41   f  receives the plate-shaped protrusions  42   c  and  42   d  and guide the received plate-shaped protrusions  42   c  and  42   d  into the aperture  41   e . Therefore, the inner cylinder  41   c  is also overhung inward of the opening part  41   a  on the portion of the guide protrusion  41   f , so that the inner cylinder  41   c  is overhung inward of the opening part  41   a  on the portion of the protrusions  41   b.    
         [0151]    A concave  411   f  recessing to the front side of the television receiving apparatus  1  toward the outer cylinder  41   d  from the tip portion of the guide protrusion  41   f , is formed on the rear side surface of the guide protrusion  41   f . The inner wall of the concave  411   f  on the outside is formed as the peripheral wall of the outer cylinder  41   d , and the aperture  41   e  is formed in the substantially center of the inner wall of the concave on the outside  411   f . The bottom of the concave  411   f  is formed in a plane shape and inclined uniformly toward the outer cylinder  41   d  from the tip of the guide protrusion  41   f . In addition, the bottom portion of the concave  411   f  is extended toward the inside end from the aperture  41   e . Alternatively, the bottom portion of the concave  411   f  is narrower toward the aperture  41   e  from the inside end. That is, in order to guide the plate-shaped protrusion  42   c  to the aperture  41   e , the bottom of the concave  411   f  is converged towards the aperture  41   e . The bottom of the concave  411   f  is formed in a trapezoidal shape having an upper base shorter than the lower base in a plan view, and the upper base thereof is consistent with the aperture  41   e  formed in the outer cylinder  41   d . The substantial shape of the concave  411   f  is similar to a dustpan. 
         [0152]    The protrusion  41   b  corresponding to the plate-shaped protrusion  42   d  is provided on the both upper corner portions of the opening part  41   a  in the back cabinet body  41 , such that the guide protrusion  41   f  is provided on the back cabinet body  41  corresponding to the plate-shaped protrusion  42   c  (see  FIGS. 5A and 6 ). The plate-shaped protrusions  41   b  are formed in the same shape as the guide protrusion  41   f  and have the same function. 
         [0153]    Further, in order to fix the cover  42  to the back cabinet body  41 , the plate-shaped protrusions  41   b  corresponding to the plate-shaped protrusions  42   d  may be the plate-shaped protrusions  41   b  for erecting the bosses (not illustrated) (see  FIGS. 5A and 6 ). 
         [0154]    As illustrated in  FIG. 13 , two positioning ribs  41   g  are erected slightly outside from the center aperture  41   e  formed in the outer cylinder  41   d  of the back cabinet body  41  toward the front side of the television receiving apparatus  1 . In order to correctly insert the plate-shaped protrusion  42   c  in the aperture  41   e , the positioning ribs  41   g  have a function to position the cover  42  in line with the back cabinet body  41  during an inserting process. 
         [0155]    As illustrated in  FIGS. 8 and 10 , the locking claws  42   e  are formed on the peripheral edge part of the cover  42  underside surface (the front side of the television receiving apparatus  1 ). In this embodiment, a total of thirty-two locking claws  42   e , for example, four locking claws along each of the short side of the cover  42 , ten locking claws along the upper long side of the cover  42 , and fourteen locking claws along the lower long side of the cover  42 , are provided. The tip portions of the locking claws  42   e  face the outside of the cover  42 . Therefore, the tip portions of locking claws  42   e  provided along the facing long sides of the cover  42  are mutually oppositely oriented. Similarly, the tip portions of locking claws  42   e  provided along the facing short sides of the cover  42  are mutually oppositely oriented. 
         [0156]      FIGS. 17A and 17B  are perspective views of the locking claw  42   e  as seen obliquely from the upper right of the tip portion  422   e  side thereof in different angles with respect to each other.  FIG. 17C  is a perspective view of the locking claw  42   e  as seen obliquely from the upper left of an opposite side to the tip portion  422   e.    
         [0157]      FIG. 18  is a cross-sectional view illustrating an example of the locking claw  42   e .  FIG. 18  is a cross-sectional view of the locking claws  42   e  provided along the long side of the cover  42  taken by cutting in a sectional plane parallel to a normal line and the short side of the cover  42 , for example. 
         [0158]    The locking claw  42   e  includes a bent plate portion (a base)  421   e , a tip portion  422   e  and a reinforcing rib  423   e.    
         [0159]    For example, the bent plate portion  421   e  of the locking claw  42   e  provided along the long side of the cover  42  is formed in a rectangular shape as seen in a short side direction of the cover  42 , and is formed in a crank shape having a step portion bending to outside of the cover  42  as seen in a long side direction of the cover  42 . For example, two square shape slits  424   e  are opened in the locking claws  42   e  above from a bent portion of the bent plate portion  421   e . Further, the shape of the slit  424   e  is not limited to a square shape, and for example, the slit  424   e  may be formed in a rectangular shape. The bent plate portion  421   e  is formed along the periphery to the peripheral edge part of an underside surface of the cover  42 . Preferably, the bent plate portion  421   e  is formed in a position corresponding to the inner cylinder  41   c  of the back cabinet body  41 , when the cover  42  is attached to the back cabinet body  41 . The tip end portion  422   e  is formed on the apical face of the bent plate portion  421   e.    
         [0160]    The tip end portion  422   e  is formed in a triangle prismatic-shaped pawl elongated in a circumferential direction of the cover  42 . The tip end portion  422   e  is formed so as to contact the triangle prismatic side thereof with the apical face of the bent plate portion  421   e.    
         [0161]    The reinforcing rib  423   e  is formed in a trapezoidal shape in a plan view in the circumferential direction of the cover  42 , and is formed on a corner forming the cover  42  underside surface and the inner surface of the base of the bent plate portion  421   e . The height of the reinforcing rib  423   e  from an underside surface of the cover  42  is equal to the height of the bent portion of the bent plate portion  421   e  from  42  an underside surface of the cover  42 , for example. 
         [0162]    The locking claw  42   e  has three reinforcing ribs  423   e  disposed at equal intervals, and two slits  424   e  formed in positions corresponding to between the reinforcing ribs  423   e.    
         [0163]    When the plate-shaped protrusions  42   c  and  42   d  of the cover  42  are inserted into the apertures  41   e , the cover  42  is aligned with the back cabinet body  41 . Thereafter, the cover  42  is temporarily jointed or fixed to the back cabinet body  41  using the locking claws  42   e  provided on the cover  42 , and then the cover  42  is attached to the back cabinet body  41  by screwing. 
         [0164]      FIGS. 19A ,  19 B and  FIG. 19C  are views for explaining the state in which the locking claw  42   e  of the cover  42  is locked to the inner cylinder of the back cabinet body  41 , before, during and after locking, respectively. When attaching the cover  42  to the back cabinet body  41 , a worker presses the upper side surface of the cover  42  (the rear side of the television receiving apparatus  1 ), such that the outward pawl of the locking claw  42   e  is locked to the peripheral wall end face of the inner cylinder  41   c  provided on the peripheral edge of the opening part  41   a  of the back cabinet body  41 . 
         [0165]    That is, if the worker presses the upper side surface of the cover  42 , the tip end portion  422   e  of the cover  42  presses the periphery of the opening part  41   a  including the inner cylinder  41   c  ( FIG. 19A ). The pressed periphery of the opening part  41   a  is bent forward and outward of the television receiving apparatus  1 , and the locking claws  42   e  are also elastically deformed inward of the television receiving apparatus  1  ( FIG. 19B ). When the tip end portion  422   e  of the cover  42  is further moved forward of the television receiving apparatus  1  from the peripheral wall end face of the inner cylinder  41   c , the pawl of the tip end portion  422   e  is locked to the peripheral wall end face of the inner cylinder  41   c , thereby fixing the cover  42  to the back cabinet body  41  ( FIG. 19C ). 
         [0166]      FIG. 20A  is a view for explaining a part of an upper side surface of the cover  42  corresponding to the locking claw  42   e .  FIG. 20B  is a view illustrating the locking claw  42   e  added by a hidden double-dashed dotted line in  FIG. 20A . A triangle (Δ) mark  42   f  is formed slightly outside from a position corresponding to the locking claws  42   e  in an upper side surface of the cover  42 . 
         [0167]    The locking claws  42   e  cannot be seen from the upper side of the cover  42 . However, the worker may press the upper side surface portion of the cover  42  corresponding to the locking claw  42   e  by using the triangle (Δ) mark  42   f  as a guide, thereby the locking claws  42   e  can be locked to the back cabinet body  41 . 
         [0168]      FIG. 21  is a partial enlarged view of the periphery of the opening part  41   a  abutting the locking claw  42   e .  FIG. 21  illustrates the periphery of the opening part  41   a  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0169]    The periphery of the opening part  41   a  abutting the locking claws  42   e  is provided with a total of two notches  41   h  on both sides of the portion abutting the locking claws  42   e , respectively. In order to lock the locking claws  42   e  to the peripheral wall end face of the inner cylinder  41   c , it is necessary for the inner peripheral portion of the opening part  41   a  to be elastically deformed. When the degree of elastic deformation in the periphery of the opening part  41   a  is small, fixing of the cover  42  to the back cabinet body  41  is difficult. In some cases, since the amount of the elastic deformation of the periphery of the opening part  41   a  is also taken up by the locking claws  42   e , the locking claws  42   e  may be damaged. In this regard, the notches  41   h  have a function to easily bend the periphery of the opening part  41   a . Therefore, it is possible to attach the cover  42  to the back cabinet body  41  without applying an excessive force to the locking claws  42   e.    
         [0170]    Next, an assembling method of the back cabinet  4  will be described. 
         [0171]      FIG. 22  is a view for explaining a state during assembling the back cabinet  4 . The back cabinet body  41  is placed on a horizontal plane such that the upper side thereof is faced upward. The cover  42  is held with both hands such that the plate-shaped protrusions  42   c  and  42   d  are located toward the front, the upper side of the cover  42  is faced upward, and the cover  42  is located substantially horizontal. Then, the cover  42  is moved to a position in which the plate-shaped protrusions  42   c  and  42   d  face the guide protrusion  41   f  and plate-shaped protrusions  41   b  of the back cabinet body  41 , respectively. In this case, the long side of the opening part  41   a  and the long side of the cover  42  are substantially parallel to each other, and the short side of the opening part  41   a  and the short side of the cover  42  also are substantially parallel to each other. 
         [0172]    The one long side of the cover  42  (a front side long side of the cover  42 ) is lifted around other long side of the cover  42  provided with plate-shaped protrusions  42   c  and  42   d , such that the cover  42  is inclined to the upper side surface of the back cabinet body  41  (the horizontal plane). Preferably, an inclined angle of the cover  42  in this case is close to the inclined angle of the bottom of the concave  411   f  provided in the guide protrusion  41   f  and the protrusion  41   b  of the back cabinet body  41 . Then, the plate-shaped protrusions  42   c  and  42   d  are slowly inserted into the aperture  41   e  formed in the outer cylinder  41   d , that is, the aperture  41   e  of deepest region of the concave  411   f.    
         [0173]    In this case, since the center plate-shaped protrusion  42   c  is longer than the plate-shaped protrusions  42   d  of both sides, the center plate-shaped protrusion  42   c  is firstly inserted into the concave  411   f  of the guide protrusion  41   f , and then the plate-shaped protrusions  42   d  of both sides are inserted into the concaves  411   f  of the protrusion  41   b . Next, the center plate-shaped protrusion  42   c  is firstly inserted into the aperture  41   e , and then the plate-shaped protrusions  42   d  of both sides are inserted into the aperture  41   e . Accordingly, the worker can finish without the difficult task of simultaneously inserting the three plate-shaped protrusions  42   c  and  42   d  into the aperture  41   e . Further, since the positioning ribs  41   g  for positioning in the lateral direction are provided behind the aperture  41   e  in which the center plate-shaped protrusion  42   c  is inserted, the plate-shaped protrusion  42   c  is guided by the two positioning ribs  41   g . Thereby, the positioning of the cover  42  relative to the long side direction (the lateral direction) and the short side direction of the opening part  41   e  may be almost completed. 
         [0174]    When the one long side of the cover  42  is slowly pivoted downward around the other long side of the cover  42  provided with the plate-shaped protrusions  42   c  and  42   d , the inclined angle of the cover  42  becomes gradually reduced. The locking claws  42   e  of the cover  42  abuts the periphery of the opening part  41   a . Then, the worker presses the upper side surface of the cover  42  using the triangle mark  42   f  formed on the upper side surface of the cover  42  as a guide. Moving the pressing portion along the peripheral edge of the cover  42 , the pawl of all the locking claws  42   e  are locked to the peripheral wall end face of the inner cylinder  41   c , thereby the cover  42  is fixed to the back cabinet body  41 . In this case, the back cabinet  4  is provided with a structure for accurately positioning the cover  42  in line with the back cabinet body  41 . 
         [0175]      FIGS. 23 and 24  are enlarged views for explaining the state during assembling the back cabinet  4 .  FIGS. 23 and 24  are views for explaining the assembling of the cover  42  to the back cabinet body  41 .  FIG. 23  is an enlarged view illustrating a upper right part of the back cabinet  4 , and  FIG. 24  is an enlarged view illustrating a upper left part of the back cabinet  4 . 
         [0176]    A rectangular-shaped protrusion  41   i  is provided in the center of the short side end face of the opening part  41   a , respectively. In addition, the peripheral surface of the opening part  41   a  is the same as the inner peripheral surface of the inner cylinder  41   c . Meanwhile, in order to attach the cover  42  to the back cabinet body  41 , two guide ribs  42   g  are provided in the center of the left and right short side edge portion of the underside surface of the cover  42 . The two guide ribs  42   g  may be provided so as to be loosely fitted away from the protrusion  41   i.    
         [0177]    When pressing the upper side surface of the cover  42  in accordance with the short side of the cover  42  to the short side of the opening part  41   a , due to the guide ribs  42   g  provided on the left and right by each guide protrusions  41   i , the cover  42  is positioned with respect to the short side direction of the opening part  41   a.    
         [0178]      FIG. 25  is a view illustrating the peripheral edge part of the opening part  41   a  and the peripheral edge part of the cover  42  in the back cabinet body  41  as seen from the front side of the television receiving apparatus  1 .  FIG. 25  is an enlarged view illustrating near the lower portion of the opening part  41   a  in the back cabinet body  41  assembled with the cover  42 . The peripheral edge part of the underside surface of the cover  42  is provided with positioning ribs  42   h . For example, ten positioning ribs  42   h  are disposed on positions corresponding to the lower long side of the cover  42  at substantially equal intervals. The positioning ribs  42   h  are provided near the inner peripheral surface of the inner cylinder  41   c  of the back cabinet body  41 . 
         [0179]    For example, eleven similar positioning ribs  42   h  are provided on positions corresponding to the upper long side of the cover  42 . 
         [0180]    When pressing the upper side surface of the cover  42  in accordance with the long side of the opening part  41   a  of the cover  42 , since the positioning ribs  42   h  guide the inner cylinder  41   c  of the back cabinet body  41 , the cover  42  is positioned with respect to the short side direction of the opening part  41   a.    
         [0181]      FIG. 25  also illustrates the locking claws  42   e . The locking claws  42   e  are locked to the peripheral wall end of the inner cylinder  41   c  provided on the underside surface of the back cabinet body  41  in the peripheral edge part of the opening part  41   a . The locking claws  42   e  have a function to fix the cover  42  to the back cabinet body  41 . 
         [0182]      FIG. 26  is a schematic cross-sectional view illustrating the assembled state of the back cabinet body  41  and the cover  42 .  FIG. 26  is a cross-sectional view of near the lower long side of the opening part  41   a  taken by cutting in a sectional plane parallel to the normal line of the cover  42  and the short side of the cover  42 . In the example of  FIG. 26 , by abutting the positioning ribs  42   h  the base of the inner cylinder  41   c , the cover  42  is controlled so as not to move downward. 
         [0183]    Further, the positioning ribs  42   h  may be provided at positions corresponding to the left and right short side of the cover  42 . In this case, the cover  42  is positioned with respect to the long side direction thereof (the lateral direction). 
         [0184]      FIG. 27  is an enlarged view for explaining the lower peripheral edge part of the opening part  41   a .  FIG. 27  is a partial enlarged view of near the center of the lower long side of the opening part  41   a  with respect to the assembled state of the back cabinet body  41  and the cover  42 , as seen obliquely from the front upper left of the television receiving apparatus  1 . 
         [0185]    The rectangular-shaped protrusion  41   j  is protruded from the peripheral surface of the inner cylinder  41   c  in the center of the lower long side of the opening part  41   a . Meanwhile, when the cover  42  is attached to the back cabinet body  41 , two guide ribs  42   i  are provided near the center of the lower long side of the underside surface of the cover  42  facing the protrusion  41   j . The two guide ribs  42   i  may be provided so as to be loosely fitted away from the protrusion  41   j . In  FIG. 27 , parts of the cover  42  other than the guide ribs  42   i  are omitted. Further, parts of the back cabinet body  41  other than the peripheral edge part of the opening part  41   a  also are omitted. 
         [0186]    When pressing the upper side surface of the cover  42  in accordance with the long side of the cover  42  to the long side of the opening part  41   a , the guide ribs  42   i  provided near the center of the lower long side of the cover  42  guide the protrusions  41   j . When the cover  42  is pivoted around the normal direction of the cover  42  with respect to the back cabinet body  41 , the position of the cover  42  may be shifted by the rotation. However, in this embodiment, a shift in a position of the cover  42  in a rotating direction around the normal direction of the cover  42  can be controlled by the plate-shaped protrusions  42   c  and  42   d  inserted in the aperture  41   e  of the back cabinet body  41 . Further, a shift in a position of the cover  42  in a rotating direction around the normal direction of the cover  42  can be controlled by the protrusions  41   j  and guide ribs  42   i . Therefore, the protrusions  41   j  and guide ribs  42   i  contribute to the positioning of the cover  42  in the rotating direction around the normal direction of the cover  42 . 
         [0187]    When the positioning of the cover  42  to the back cabinet body  41  is completed, screws are inserted in the screw through holes  42   a . Then, the inserted screws are threaded in the screw holes of the bosses provided on the protrusion  41   b  of the back cabinet body  41 , thereby the cover  42  is fixed to the back cabinet body  41 . 
         [0188]    According to the above-described television receiving apparatus  1 , it is possible to ensure safety while dividing a casing thereof. 
         [0189]    When the cabinet is made of a synthetic resin used in a large-sized thin display device, since a required clamping force is increased as the projected area increases, a larger molding machine is needed. However, in some cases, it is not possible to provide a larger molding machine. In addition, since a cost for operating the larger molding machine increases, overall costs may increase. However, if the cabinet is divided into a plurality of members, it is possible to mold the cabinet using a conventional molding machine. 
         [0190]    Meanwhile, safety relating to flammability is required in electrical products. Therefore, for example, flame retardant material with a V-1 rating is used for the material of the cabinet. However, the price of flame retardant material is expensive as the flammability rating is high. Therefore, a low grade flame retardant material is used for members of the parts isolated by a member forming the enclosure. 
         [0191]    Specifically, the cabinet is divided into a cabinet part covering the circuit board portion to which a high voltage is applied and a part with no cabinet portion. When the latter is formed as a separate piece from the cabinet, a material having a low flame retardancy may be used for the separate piece isolated by the former which is an enclosure. Thereby, it is possible to reduce the cost, while the safety of fire protection is ensured. 
         [0192]    An enclosure has a function to prevent mechanical risk, prevention of electric shock, prevention of electromagnetic interference, as well as providing dust-proofing, waterproofing, airtightness, heat insulation, explosion-proofing, or the like in addition to the fire prevention. Therefore, materials with different properties with respect to features of these enclosures may be used for each divided cabinet part. 
         [0193]    In the television receiving apparatus  1 , the back cabinet  4  is divided into two pieces of the back cabinet body  41  and the cover  42 . The back cabinet body  41  may have the opening part  41   a  in the region not facing the power board P, the drive board D and the like. Even when a material having a low flame retardancy is used to mold the cover  42  covering the opening part  41   a , as long as the back cabinet body  41  is molded from a material having a high flame retardancy, safety in terms of fire protection may be secured. 
         [0194]    In addition, the back cabinet body  41  may have the opening part  41   a  in the region facing the power board P, the drive board D and the like. In this case, material having a high flame retardancy or material having a low electrical conductivity is used for the cover  42  covering the opening part  41   a . On the other hand, material having a low flame retardancy or material having a low electrical conductivity is used for the back cabinet body  41 . By this, it is also possible to achieve cost reduction, as well as safety for fire prevention or electric shock. 
         [0195]    The cover  42  is provided with the plate-shaped protrusions  42   c  and  42   d , and the back cabinet body  41  is provided with the guide protrusion  41   f , plate-shaped protrusions  41   b  and the aperture  41   e  along one long side of the opening part  41   a . Therefore, when assembling the back cabinet  4 , by inserting the plate-shaped protrusions  42   c  and  42   d  into the aperture  41   e  along the respective guide protrusion  41   f  and the protrusion  41   b , alignment of the cover  42  with the back cabinet body  41  may be substantially completed. 
         [0196]    The plate-shaped protrusions  42   c  and  42   d  are provided with the ribs  421   c  and  421   d  on the rear side of the television receiving apparatus  1 . The rib  421   c  and  421   d  is disposed substantially parallel to the long side direction of the rectangular-shaped aperture  41   e  provided on the outer cylinder  41   d  or the long side direction of the opening part  41   a.    
         [0197]      FIGS. 28A and 28B  are cross-sectional views illustrating the plate-shaped protrusion  42   c  and the guide protrusion  41   f  assembled with the back cabinet  4 .  FIGS. 28A and 28B  are cross-sectional views of the plate-shaped protrusion  42   c  and the guide protrusion  41   f  taken by cutting in a sectional plane parallel to the normal line of the cover  42  and the short side of the cover  42 .  FIG. 28A  illustrates a normal state of the plate-shaped protrusion  42   c  and the guide protrusion  41   f .  FIG. 28B  illustrates the plate-shaped protrusion  42   c  and the guide protrusion  41   f  with the plate-shaped protrusion  42   c  deformed so as to insert a foreign matter into the television receiving apparatus  1  from the aperture  41   e.    
         [0198]    Even when trying to insert the foreign matter such as clips, or the like from the aperture  41   e , the rib  421   c  may prevent the insertion of the foreign matter. Even when the plate-shaped protrusion  42   c  is pressed to the front side of the television receiving apparatus  1 , the rib  421   c  follows the plate-shaped protrusion  42   c . Even when trying to insert a foreign matter into the television receiving apparatus  1  through the aperture  41   e  along the surface of the plate-like protrusion  42   c , the rib  421   c  may prevent the insertion of the foreign matter. Similar to the rib  421   c , the rib  421   d  also has a function to prevent the insertion of the foreign matter. 
         [0199]    The outer cylinder  41   d  is a part of the enclosure of the back cabinet body  41 , but it can be said that only the aperture  41   e  is also a passage connecting the television receiving apparatus  1  and the outside. Therefore, the ribs  421   c  and  421   d  also have a function as an enclosure. 
         [0200]    In addition, after the back cabinet  4  is assembled, the back cabinet  4  may have a structure that, even when the plate-shaped protrusions  42   c  and  42   d  are pressed, it is rarely deformed. For example, when the plate-shaped protrusions  42   c  and  42   d  are inserted through the aperture  41   e , a pawl for locking the tip portion of the plate-shaped protrusions  42   c  and  42   d  may be provided on the underside surface of the back cabinet body  41  (the front side of the television receiving apparatus  1 ). 
         [0201]    When the locking claw  42   e  is locked to the peripheral wall end of the inner cylinder  41   c  forming the peripheral surface of the opening part  41   a , the cover  42  may be easily fixed to the back cabinet body  41 . If it is sufficient to fix the cover  42  only by the locking force of the locking claw  42   e , the screw through holes  42   a  of the cover  42  and the bosses of the back cabinet body  41  may be omitted. 
         [0202]    Alternatively, the cover  42  may be fixed to the back cabinet body  41  by the screws alone. In such a case, the locking claws  42   e  may be omitted. 
         [0203]    Since the locking claws  42   e  are protrusion parts protruding from the cover  42 , a risk of damage due to an excessive load may be considered. On the other hand, when the cover  42  is attached to the back cabinet body  41 , it is necessary for the locking claw  42   e  to elastically deformation within limit range. Therefore, it is necessary to adjust the strength of the locking claws  42   e . In this case, by changing the number or thickness of the reinforcing rib  423   e , the shape or size of the rectangular-shaped slits  424   e , or the thickness of the bent plate portion  421   e , it is possible to adjust the strength of the locking claws  42   e.    
         [0204]    In order to increase the strength of the locking claws  42   e , for example, when the thickness of the base of the bent plate portion  421   e  is increased, sink marks of material may occur in the corner forming the base of the bent plate portion  421   e  and the underside surface of the cover  42 . However, even when the thickness of the base of the bent plate portion  421   e  is reduced to such an extent that the sink marks do not occur, by changing the attributes of the slits  424   e  or the  423   e , it is possible to adjust the strength of the locking claw  42   e.    
         [0205]    The opening part  41   a  is provided in the upper center of the back cabinet body  41 . However, the opening part  41   a  may be provided in other regions of the back cabinet body  41  in consideration of the position of the heating board. For example, instead of the inside of the back cabinet body  41 , the opening part  41   a  may be a bored region including the end of the back cabinet body  41 . In this case, the bored region is not an opening anymore, but rather becomes a cut out portion. Further, in accordance with the notch shape, the shape of the cover  42  may be determined. 
         [0206]    The shape of the opening part  41   a  and the cover  42  is not limited to substantially rectangular, respectively. For example, in consideration of the position of the heating board, various shapes such as elliptical, circular, trapezoidal shapes, L-shapes, T-shapes, I-shapes, or irregular shapes may be selected as the shape of the opening part  41   a  and the cover  42 . 
       Embodiment 2 
       [0207]    Hereinafter, other embodiments of the present invention will be described. Herein, the same parts as in the above-mentioned embodiment 1 will be denoted by the same reference numerals, a description thereof will be omitted, and only differences will be described. 
         [0208]    Embodiment 2 is related to a configuration for eliminating deformation such as warping, deflection, ruffling, or the like of the back cabinet  4 . Deformation of the back cabinet  4  may be a cause of vibration. Therefore, Embodiment 2 is also relates to the configuration for inhibiting the occurrence of the vibration which may provide a feeling of dissatisfaction to viewers. 
         [0209]      FIG. 29  is an enlarged perspective view illustrating the peripheral edge part of the underside surface of the cover  42 . The peripheral edge part of the underside surface of the cover  42  is provided with the locking claw  42   e  and a hemispherical protrusion  42   j . The hemispherical protrusion  42   j  is formed in a half sphere shape and is disposed on outer side of the locking claw  42   e  in the cover  42 . In  FIG. 29 , the hemispherical protrusion  42   j  and the locking claw  42   e  are illustrated, respectively, but alternately, a plurality of the hemispherical protrusions  42   j  and locking claws  42   e  may be provided on the peripheral edge part of the cover  42  so as to surround the peripheral edge part of the underside surface of the cover  42  at substantially equal intervals. 
         [0210]      FIGS. 30A and 30B  are cross-sectional views of the back cabinet body  41  and the cover  42  near the peripheral edge of the opening part  41   a .  FIGS. 30A and 30B  are cross-sectional views of the assembled the back cabinet body  41  and the cover  42  taken by cutting in a sectional plane parallel to a normal line of the cover  42  and, for example, the short side of the cover  42 .  FIG. 30A  illustrates a state in which the locking claw  42   e  is locked to the peripheral wall, that is, the peripheral wall edge face of the opening part  41   a . The underside surface of the cover  42  near the base of the locking claw  42   e  is provided with a small gap from the back cabinet body  41 .  FIG. 30B  illustrates a state that the hemispherical protrusion  42   j  provided on the peripheral edge part of the underside surface of the cover  42  abuts the upper side surface in the peripheral edge part of the opening part  41   a  between the inner cylinder  41   c  and the outer cylinder  41   d . An underside surface of the back cabinet body  41  corresponding between the inner cylinder  41   c  and the outer cylinder  41   d  corresponds to the shelf  41   m  of the peripheral edge part of the opening part  41   a  (see  FIG. 6 ). The radius of the hemispherical protrusion  42   j  is substantially identical to the distance of the gap between the underside surface of the cover  42  near the base of the locking claw  42   e  and the upper side surface of the back cabinet body  41 . 
         [0211]    The locking claw  42   e  is configured to control the deformation in a direction of a rising upward of the cover  42  with respect to the back cabinet body  41 . The hemispherical protrusion  42   j  is configured to control the deformation in a direction of a sinking of the cover  42  with respect to the back cabinet body  41 . 
         [0212]    Since the cover  42  is an elongated large plate, deformation such as warping, deflection, ruffling, or the like may be easily occurred thereto. Further, when the thickness of the cover  42  is reduced, deformation tends to occur more significantly. In particular, at a portion where the cover  42  and the back cabinet body  41  is closed, the deformation of the cover  42  is easily-noticeable. However, the locking claws  42   e  and the hemispherical protrusion  42   j  arranged alternately may produce an effect of forcibly reducing the ruffling of the cover  42  to a low level, for example. 
         [0213]      FIG. 31A  is a partial enlarged view illustrating near a corner of the assembled cover  42 .  FIG. 31B  is a cross-sectional view of the back cabinet body  41  and the cover  42  taken on a cutting line I-I of  FIG. 31A .  FIGS. 31A and 31B  illustrate a deformation wherein the corner of the cover  42  has floated upward. 
         [0214]    The corner of the cover  42  is a part wherein it is important to minimize the upward rising deformation. Therefore, as illustrated in  FIG. 31B , the thickness in the corner of the cover  42  is formed so as to be slightly thinner toward the outside from the inside of the cover  42 . In addition, the upper side surface in the corner of the cover  42  forms a gentle slope surface inclining from an upper side to the underside toward outside from the inside. Therefore, when the corner of the cover  42  is deformed by floating, the deformation amount of rising and a drop by a gradient of an upper side surface, that is preconfigured with an appropriate structure, compensate each other, thereby producing an effect that the deformation by rising becomes less obvious. 
         [0215]    According to an alternating arrangement of the locking claw  42   e  and the hemispherical protrusion  42   j , and the inclined structure of the upper side surface of the cover  42  corner, it is possible to reduce the deformation such as warping, deflection, ruffling of the cover  42  or the like. Therefore, it is also possible to inhibit the occurrence of vibration in the television receiving apparatus  1 . 
         [0216]    Embodiment 2 is as described above, and other than that is the same as embodiment 1, such that the corresponding parts have the same reference numbers, and a detailed description, operations and effects thereof will be omitted. 
       Embodiment 3 
       [0217]    Embodiment 3 is related to a configuration to inhibit change in a width of a groove  43  between the cover  42  and the back cabinet body  41  due to thermal expansion or contraction. 
         [0218]    When the back cabinet body  41  and the cover  42  are made of molding materials having different flame retardancy from each other, thermal expansion coefficients of the back cabinet body  41  and the cover  42  may be different. In addition, since the shape of the back cabinet body  41  and the cover  42  is not a sphere or spherical shell of thermally isotropic material, they have anisotropy in terms of thermal deformation. Therefore, the relative positional relationship between the back cabinet body  41  and the cover  42  after assembling may be changed with a change in temperature. 
         [0219]      FIG. 32  is an enlarged plan view illustrating an example of the back cabinet body  41  and the cover  42  after assembling as seen from a rear side of the television receiving apparatus  1 . A groove  43  having a small width is formed between the outer edge (corresponding to a position of the outer cylinder  41   d ) of the shelf  41   m  in the peripheral edge part of the opening part  41   a  of the back cabinet body  41  and the periphery of the cover  42 . As illustrated in  FIG. 3 , the groove  43  surrounds the entire periphery of the cover  42 . The width of the groove  43  is constant at all parts of the periphery of the cover  42 . The bottom of the groove  43  corresponds to the shelf  41   m  of peripheral edge of the opening part  41   a . The groove  43  has a function to provide an appearance to the back cabinet  4 , and to form a buffer for preventing contact due to thermal deformation between the peripheral surface (the inner peripheral surface of the inner cylinder  41   c ) of the opening part  41   a  of the back cabinet body  41  and the peripheral edge surface of the cover  42 . 
         [0220]    However, when the relative positional relationship between the back cabinet body  41  and the cover  42  is changed due to thermal deformation, the width of the groove  43  may be different depending on the position of the periphery of the cover  42 . In this case, the result undermines the appearance of the television receiving apparatus  1 . 
         [0221]      FIG. 33A  is a perspective view illustrating a hole  41   k  formed in an upper edge part of the opening part  41   a  of the back cabinet body  41  as seen obliquely from the rear lower left of the television receiving apparatus  1 .  FIG. 33A  illustrates an example of the hole  41   k  provided in the back cabinet body  41 .  FIG. 33B  is a perspective view illustrating a columnar protrusion  42   k  provided on the peripheral edge part of the underside surface above the cover  42  as seen obliquely from the front upper right of the television receiving apparatus  1 .  FIG. 33B  illustrates an example of the columnar protrusion  42   k  protruded from the cover  42 . 
         [0222]    The hole  41   k  is formed in, for example, a rectangular shape, and is formed in the shelf  41   m  of the peripheral edge of the opening part  41   a . The hole  41   k  may have a circular shape, elliptical shape or the like. When seen from the underside of the back cabinet body  41 , the hole  41   k  is disposed between the inner cylinder  41   c  and the outer cylinder  41   d . A plurality of holes  41   k  may be formed along the periphery of the opening part  41   a . The number of holes  41   k  disposed above and below the opening part  41   a  is twelve, for example, respectively. The number of holes  41   k  disposed on both lateral sides of the opening part  41   a  is five, for example, respectively. 
         [0223]    The columnar protrusion  42   k  is formed in a column shape, and is erected on the underside of the cover  42 . The tip of the columnar protrusion  42   k  is formed in a rounded hemispherical shape. The cross-sectional area of the columnar protrusion  42   k  taken by cutting in a sectional plane perpendicular to a height direction thereof is smaller than the opening area of the hole  41   k . The columnar protrusion  42   k  is formed in the same number as the hole  41   k  on the peripheral edge part of the underside surface of the cover  42  along the periphery of the cover  42 . The hole  41   k  is configured to be disposed in a position facing the hole  41   k  with the cover  42  attached to the back cabinet body  41 . In addition, the columnar protrusion  42   k  is configured to loosely fit into the hole  41   k  arranged in the corresponding position with the cover  42  attached to the back cabinet body  41 . 
         [0224]      FIG. 34A  is a cross-sectional view of an example of the hole  41   k  and the columnar protrusion  42   k .  FIG. 34A  illustrates the assembled back cabinet body  41  and the cover  42  taken by cutting in a sectional plane parallel to the normal line of the cover  42  and, for example, the short side of the cover  42 .  FIG. 34A  is an enlarged cross-sectional view illustrating a part of the hole  41   k  and the columnar protrusion  42   k .  FIG. 34B  is a perspective view illustrating the assembled back cabinet body  41  and the cover  42  as seen from the upper side of the cover  42 . In  FIG. 34B , the hole  41   k , the columnar protrusion  42   k  and the locking claw  42   e  originally hidden by the cover  42  is illustrated by a hidden double-dashed dotted line.  FIG. 34B  illustrates a state in which the columnar protrusion  42   k  is loosely fitted into the substantially center of the hole  41   k .  FIGS. 34A and 34B  illustrate an example of the columnar protrusion  42   k  fitted in the hole  41   k  with the cover  42  attached to the back cabinet body  41 . 
         [0225]    When the relative position of the back cabinet body  41  and the cover  42  is changed due to a change in temperature after assembling, the position of the columnar protrusion  42   k , which is loosely fitted into the hole  41   k , moves relative to the peripheral surface of the hole  41   k . However, when the columnar protrusion  42   k  abuts the peripheral surface of the hole  41   k , the movement of the columnar protrusion  42   k  with respect to the hole  41   k  is controlled. Therefore, the relative movement of the cover  42  including the columnar protrusion  42   k  to the back cabinet body  41  including the hole  41   k  is controlled. Since the plurality of the columnar protrusion  42   k  and the hole  41   k  are provided in the peripheral edge of the cover  42 , the control level and orientation for the movement of the columnar protrusion  42   k  with respect to hole  41   k  vary depending on the location of the periphery of the cover  42 . As a result, since a change in the width of the groove  43  between the back cabinet body  41  and the cover  42  is regulated at each position of the periphery of the cover  42 , the width of the groove  43  in the portion with the periphery of the cover  42  may be constantly maintained. Therefore, the hole  41   k  and the columnar protrusion  42   k  contribute to maintain the aesthetic appearance of the back cabinet  4 . 
         [0226]    Embodiment 3 is as described above, and other than that is the same as embodiments 1 and 2, such that the corresponding parts have the same reference numbers, and a detailed description, operations and effects thereof will be omitted. 
       Embodiment 4 
       [0227]    Embodiment 4 is related to a configuration in which the back cabinet  4  is provided with a plurality of lattice opening parts, rather than cutting out the back cabinet  4  to form the single opening part  41   a  therein. Further, embodiment 4 is related to a configuration in which a thin punching sheet with a plurality of bored holes is adhered to grids forming the plurality of opening parts, instead of the cover  42  covering the opening part in embodiments 1 to 3. 
         [0228]      FIG. 35A  is a plan view illustrating the back cabinet body  410  as seen from the rear side of the television receiving apparatus  1 .  FIG. 35B  is a plan view illustrating a cover sheet  420  as seen from the rear side of the television receiving apparatus  1 .  FIGS. 35A and 35B  illustrate an example of a dividing member of the back cabinet  4  as seen from the rear side of the television receiving apparatus  1 , respectively. The back cabinet  4  includes a back cabinet body  410  and the cover sheet  420 . 
         [0229]    The back cabinet body  410  has an inner cylinder  41   c  and an outer cylinder  41   d  similar to those of the back cabinet body  41  (for simplicity, the inner cylinder  41   c  and the outer cylinder  41   d  are not illustrated in  FIG. 35A , therefore, see the inner cylinder  41   c  and the outer cylinder  41   d  illustrated in  FIGS. 4 and 6 ). On the other hand, the back cabinet body  410  has no plate-shaped protrusion  41   b , guide protrusion  41   f  and the like. The inner cylinder  41   c  and the outer cylinder  41   d  serve as providing the enclosure. 
         [0230]    The back cabinet body  410  has a plurality of grids  41   m  arranged in a vertical direction and horizontal direction at a portion corresponding to the opening part  41   a  of the back cabinet body  41 . By the grids  41   m  formed in a lattice structure, a plurality of the opening parts  410   a  are formed in the upper center of the back cabinet body  410 . The thickness and the number of the grids  41   m  may be determined in consideration of the strength of the back cabinet body  410 .  FIG. 35A  illustrates an example of the grids  41   m  having a prescribed thickness and number. 
         [0231]    The back cabinet body  410  including the inner cylinder  41   c , the outer cylinder  41   d  and the grids  41   m  is formed by integral molding using a material (for example, a resin material) having a flame-retardancy rating of V-1 or more. 
         [0232]    The cover sheet  420  is a thin lightweight sheet formed by using a material (for example, a resin material) having a flame-retardancy rating of HB. The shape and planar size of the cover sheet  420  is determined according to the whole of the plurality of opening parts  410   a . In the example of  FIG. 35B , the cover sheet  420  has a rectangular shape. The thickness of the cover sheet  420  is 0.5 mm, for example. The cover sheet  420  has a plurality of holes  42   m  formed by punching. The size of each hole  42   m  may be a size to sufficiently meet safety standards for shielding foreign matter. The shape of the hole  42   m  is not particularly limited and, for example, may be a circular hole having a diameter of 2 mm to 4 mm. 
         [0233]    The cover sheet  420  has no locking claw  42   e , plate-shaped protrusions  42   c  and  42   d , and the like included in the cover  42 . 
         [0234]      FIG. 36  is a plan view illustrating an example of the back cabinet  4  as seen from the rear side of the television receiving apparatus  1 . When assembling the back cabinet  4 , the cover sheet  420  is adhered to the grids  41   m  of the back cabinet body  410  by an adhesive, double-sided tape or the like. 
         [0235]    According to the television receiving apparatus  1  of embodiment 4, since the back cabinet body  410  is provided with the plurality of opening parts  410   a , it is possible to reduce the pressure in a mold during molding. 
         [0236]    The cover sheet  420  is lightweight, and during the assembling work of the television receiving apparatus  1 , the cover sheet  420  is easily adhered to the grids  41   m . Therefore, the burden on workers may be reduced, and efficiency of assembly is improved. 
         [0237]    Since the inner cylinder  41   c  and the outer cylinder  41   d  having a function of providing the enclosure are formed around the grid part of the back cabinet body  410  toward the inside of the television receiving apparatus  1 , it is possible to lower the flame retardancy rating of the cover sheet  420 . Further, the outer cylinder  41   d  may be omitted. 
         [0238]    The opening part  410   a  formed in the back cabinet body  410  and the hole  42   m  formed in the cover sheet  420  may effectively release heat generated in the television receiving apparatus  1  to the outside. 
         [0239]    Embodiment 4 is as described above, and other than that is the same as embodiments 1 to 3, such that the corresponding parts have the same reference numbers, and a detailed description, operations and effects thereof will be omitted. 
       Embodiment 5 
       [0240]    Embodiment 5 is related to a configuration of a linearly divided back cabinet  4  into two upper and lower casing parts. The lower rear surface of the display unit  2  provided with heating elements such as a power board P, drive board D, and the like is covered by a lower back cabinet having a high flame retardancy. The rear upper portion of the display unit  2  with no heating element is covered by an upper back cabinet having a low flame retardancy. 
         [0241]    The back cabinet  4  includes an upper back cabinet  45  and a lower back cabinet  46 .  FIG. 37A  is a plan view illustrating the upper back cabinet  45  as seen from the rear side of the television receiving apparatus  1 .  FIG. 37B  is a plan view illustrating the lower back cabinet  46  as seen from the rear side of the television receiving apparatus  1 .  FIGS. 37A and 37B  illustrate an example of the divided members of back cabinet  4  as seen from the rear side of the television receiving apparatus  1 . 
         [0242]      FIG. 38A  is a plan view illustrating the upper back cabinet  45  as seen from the front side of the television receiving apparatus  1 .  FIG. 38B  is a plan view illustrating the lower back cabinet  46  as seen from the front side of the television receiving apparatus  1 .  FIGS. 38A and 38B  illustrate an example of the divided members of the back cabinet  4  as seen from the front side of the television receiving apparatus  1 . 
         [0243]      FIG. 39A  is a perspective view illustrating the upper back cabinet  45  as seen obliquely from the rear lower left of the television receiving apparatus  1 .  FIG. 39B  is a perspective view illustrating the lower back cabinet  46  as seen obliquely from the rear lower left of the television receiving apparatus  1 .  FIGS. 39A and 39B  illustrate an example of the divided members of the back cabinet  4  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0244]    The back cabinet  4  according to embodiment 5 is largely divided into the upper back cabinet  45  and the lower back cabinet  46  by a linear dividing line passing the center in a horizontal direction. Both of the upper back cabinet  45  and the lower back cabinet  46  have a laterally long and substantially rectangular shape as seen from the upper side (the rear side of the television receiving apparatus  1 ) plan view and the underside (the front side of the television receiving apparatus  1 ) plan view. 
         [0245]    The upper back cabinet  45  is the casing part covering the upper rear surface of the display unit  2  with no heating element, and is formed by integral molding using a material (for example, a resin material) having a flame retardancy rating of HB. On the other hand, the lower back cabinet  46  is the casing part covering the power board P, drive board D, and the like, which generate heat as a voltage is applied thereto, and is formed by integral molding using a material (for example, a resin material) having a flame retardancy rating of V-1 or more. The lower back cabinet  46  includes a rib  46 L which is provided in a portion close to the underside (the front side of the television receiving apparatus  1 ) upper end thereof and elongates in the horizontal direction to serve as the enclosure part (see  FIG. 38B ). The rib  46 L will be described in detail below. 
         [0246]    The upper back cabinet  45  includes pockets  45 P formed at lower edge thereof. Mouths of the pockets  45 P are oriented downward, and the depth direction of the pockets  45 P is upward. The pockets  45 P are formed in a horizontally elongating shape, and the horizontal width of the pockets  45 P is longer than the length thereof in the depth direction. The upper back cabinet  45  is provided with four pockets  45 P, for example. Each of the pockets  45 P arranged in the horizontal direction is separated at an interval in the horizontal direction along the lower edge of the upper back cabinet  45 . All of the four pockets  45 P have the same length in the depth direction. 
         [0247]    The pockets  45 P which are respectively disposed on left and right ends have the same lateral width as each other as seen from the front. Further, the pockets  45 P which are sandwiched between the pockets  45 P arranged on left and right ends and disposed in both sides of the lower edge center of the upper back cabinet  45  also have the same lateral width as each other as seen from the front. Meanwhile, the lateral width of the pockets  45 P arranged on left and right ends is larger than the width of the pockets  45 P arranged on central both sides. The displacement and size distribution of each of the pockets  45 P is bilaterally symmetrical with respect to the lower edge center of the upper back cabinet  45 . 
         [0248]    Hooks  46 H are formed on the upper edge of the lower back cabinet  46  elongating upwardly. In addition, a plurality of the hooks  46 H are separately arranged in a horizontal direction at intervals. In the example of the lower back cabinet  46  in  FIGS. 37B ,  38 B and  39 B, fourteen hooks  46 H are formed on an upper edge of the lower back cabinet  46 . All of these fourteen hooks  46 H have the same length in the vertical direction. Four hooks  46 H are respectively provided in a position of the lower back cabinet  46  facing the pockets  45 P respectively arranged on left and right ends of the lower edge of the upper back cabinet  45 . Three hooks  46 H are respectively provided in a position of the lower back cabinet  46  facing the two pockets  45 P arranged on both sides of the lower edge center of the upper back cabinet  45 . 
         [0249]    The lateral width of the hooks  46 H are different from each other. The four hooks  46 H disposed on the position of the lower back cabinet  46  facing the pockets  45 P respectively arranged on left and right ends of the lower edge of the upper back cabinet  45  have the longest lateral width, and each width thereof is the same. Each of the three hooks  46 H respectively provided in the position of the lower back cabinet  46  facing the two pockets  45 P arranged on both sides of the lower edge center of the upper back cabinet  45  has a different lateral width. Among these three hooks  46 H, each hook  46 H disposed in the center thereof has the longest lateral width, and each hook  46 H close to the upper edge center of the lower back cabinet  46  has the shortest lateral width. The displacement and size distribution of the fourteen hooks  46 H is bilaterally symmetrical with respect to the lower edge center of the lower back cabinet  46 . 
         [0250]    The hook  46 H is configured to be inserted into the pocket  45 P. By this configuration, when the hook  46 H is locked into the pocket  45 P, the upper back cabinet  45  and the lower back cabinet  46  are combined with each other. 
         [0251]      FIG. 40  is a view for explaining a state during assembling the back cabinet  4 .  FIG. 40  illustrates a portion of the upper back cabinet  45  and the lower back cabinet  46 . In addition, a white arrow in  FIG. 40  illustrates the insertion direction of the hook  46 H to the pocket  45 P. The plurality of hooks  46 H are inserted in one pocket  45 P. In this regard, the pocket  45 P has a pocket partition rib  45 PL formed to partition the inside thereof corresponding to separating the hooks  46 H. The pocket partition rib  45 PL is provided on an inner surface of the pocket  45 P facing the front side of the television receiving apparatus  1 . 
         [0252]      FIGS. 41A to 41C  are cross-sectional views for explaining a state during assembling of the back cabinet  4 .  FIGS. 41A to 41C  illustrate a portion of the upper back cabinet  45  and the lower back cabinet  46 , respectively. In  FIGS. 41A to 41C , the bottom and top are the upper side and underside of the back cabinet  4 , respectively. In addition, in  FIGS. 41A to 41C , the bottom and top direction are the front and rear sides of the television receiving apparatus  1 , respectively. Further, in  FIGS. 41A to 41C , the left and right direction are the top and bottom side of the television receiving apparatus  1 , respectively.  FIGS. 41A to 41C  illustrate a cross-section taken by cutting the upper back cabinet  45  and the lower back cabinet  46  in a surface perpendicular to the horizontal direction, respectively. 
         [0253]      FIG. 41A  illustrates the state before inserting the hook  46 H of the lower back cabinet  46  into the pocket  45 P of the upper back cabinet  45 .  FIG. 41B  illustrates a state during inserting the hook  46 H of the lower back cabinet  46  into the pocket  45 P of the upper back cabinet  45 .  FIG. 41C  illustrates a state in which the hook  46 H of the lower back cabinet  46  is locked to the pocket  45 P of the upper back cabinet  45 . 
         [0254]    The upper end of the lower back cabinet  46  has a step portion  461  which is bent and stepped to the underside (the front side of the television receiving apparatus  1 ) of the back cabinet  4 . The hooks  46 H are provided at the tip of the step portion  461 . The hook  46 H is bent from the tip of the step portion  461 , and is further sunk to the underside (the front side of the television receiving apparatus  1 ). Therefore, the step portion  461  and the hook  46 H are formed in a crank shape having two stepped bent portions. A nose  46   h  bent to the upper side (the rear side of the television receiving apparatus  1 ) of the back cabinet  4  is provided at the tip of the hook  46 H. 
         [0255]    On the other hand, the pocket  45 P has a hook locking rib  45 L on the inner surface thereof facing the front side of the television receiving apparatus  1  to be locked to the nose  46   h  of the hook  46 H. The height of the hook locking rib  45 L increases toward the depth from mouth of the pocket  45 P, and is cut off at the front from the innermost surface of the pocket  45 P. The hook locking rib  45 L is formed in a triangular prism shape, and in  FIGS. 41A to 41C , the hook locking rib  45 L is seem as a wedge shape. Each hook  46 H is locked two hook locking ribs  45 L provided on the inner surface of the pocket  45 P (see  FIG. 40 ). Each hook locking rib  45 L is arranged in the horizontal direction, so as to correspond to all of the fourteen hooks  46 H. 
         [0256]    When the nose  46   h  of the hook  46 H is locked to the hook locking rib  45 L, the lower back cabinet  46  is inclined to the upper back cabinet  45 , such that the lower end side of the lower back cabinet  46  is positioned more toward the upper side (the rear side of the television receiving apparatus  1 ) (see  FIG. 41B ). Then, the hook  46 H is inserted into the pocket  45 P so as to cover the hook locking rib  45 L with the hook  46 H. In order to release the inclination of the lower back cabinet  46  to the upper back cabinet  45 , the lower back cabinet  46  is pivoted around the nose  46   h , and thereby the lower end side of the lower back cabinet  46  more closely approximates to the underside (the front side of the television receiving apparatus  1 ). When the hook  46 H is locked to the hook locking rib  45 L (see  FIG. 41C ), the lower surface of the nose  46   h  abuts the upper surface of the hook locking rib  45 L, and the underside (the front side of the television receiving apparatus  1 ) surface of the hook  46 H abuts the inner surface of the pocket  45 P. Further, when the hook  46 H is locked to the hook locking rib  45 L (see  FIG. 41C ), the lower end face of the upper back cabinet  45  abuts the apical face of the end portion  461 . 
         [0257]    When the lower back cabinet  46  is separated from the upper back cabinet  45 , the lower back cabinet  46  is removed from the upper back cabinet  45 , by the procedure reverse to the order in  FIGS. 41A ,  FIGS. 41B and 41C . 
         [0258]    When the upper back cabinet  45  is combined with the lower back cabinet  46 , it is preferable that the upper side (the rear side of the television receiving apparatus  1 ) surface of the step portion  461  and the upper side (the rear side of the television receiving apparatus  1 ) surface of the upper back cabinet  45  form a smooth plane. For this, the step of the bent portion at the base of the hook  46 H may be adjusted. Therefore, appearance of the rear surface of the television receiving apparatus  1  may be maintained. 
         [0259]    Further, a pocket reinforcing rib  45 PLr for reinforcing the strength of the pocket  45 P is provided in the corner forming the innermost surfaces of the pocket  45 P and the inner front side surface of the pocket  45 P. 
         [0260]    The rib  46 L is protruded from the underside surface (the front side of the television receiving apparatus  1 ) at the root portion of the step portion  461 . The rib  46 L serves as an enclosure for isolating the upper back cabinet  45  from the power board P, drive board D, and the like covered with the lower back cabinet  46 . 
         [0261]      FIG. 42  is a plan view illustrating an example of the back cabinet  4  as seen from the rear side of the television receiving apparatus  1 . 
         [0262]      FIG. 43  is a plan view illustrating the example of the back cabinet  4  as seen from the front side of the television receiving apparatus  1 . 
         [0263]      FIG. 44  is a perspective view illustrating an example of the back cabinet  4  as seen obliquely from the rear lower left of the television receiving apparatus  1 . 
         [0264]    After assembling the back cabinet  4 , the hook  46 H is housed in the pocket  45 P, thereby it is not possible to see the hook  46 H from the outside or inside of the television receiving apparatus  1  ( FIGS. 42 to 44 ). In addition, it is also not possible to see the pocket  45 P from the standpoint of appearance ( FIG. 42  and  FIG. 44 ). 
         [0265]    Further, it is also not possible to see the pocket rib  46 L from the standpoint of appearance ( FIG. 42  and  FIG. 44 ). However, when the back cabinet  4  is seen from the inside of the television receiving apparatus  1  ( FIG. 43 ), the rib  46 L is a partition wall that partitions, in a straight line, the upper back cabinet  45  and the lower back cabinet  46 . 
         [0266]    Next, a method of attaching the back cabinet  4  to the front cabinet  3  and the display unit  2  will be described. The front cabinet  3 , the display unit  2  and the upper back cabinet  45  are aligned and superposed on the horizontal plane in this order. Then, screws are inserted into the screw through holes formed in the peripheral edge of the upper back cabinet  45 , and these members are fixed to each other by screwing. 
         [0267]    Next, the hook  46 H is inserted into the pocket  45 P, and the lower back cabinet  46  is temporarily fixed to the upper back cabinet  45  by the procedure shown in  FIGS. 41B and 41C . Thereafter, screws are inserted into the screw through holes formed in the peripheral edge of the lower back cabinet  46 , and the lower back cabinet  46  is fixed to the front cabinet  3  and the display unit  2  by screwing. 
         [0268]    Further, when repairing or replacing the receiving unit T, power board P, or drive board D covered with the lower back cabinet  46 , only the lower back cabinet  46  is removed, while the upper back cabinet  45  is fixed. 
         [0269]    According to the television receiving apparatus  1  of embodiment 5, since the back cabinet  4  is divided into the upper back cabinet  45  and the lower back cabinet  46 , it is possible to reduce the pressure in a mold during molding. 
         [0270]    The upper back cabinet  45  and the lower back cabinet  46  have a combining structure (the pocket  45 P and the hook  46 H) capable of easily assembling and disassembling, respectively. Therefore, even when the number of parts of the back cabinet  4  is increased to two, it does not significantly affect the work required for the assembling and disassembling of the back cabinet  4 . 
         [0271]    Since the lower back cabinet  46  having the rib  46 L is formed as the single body enclosure, even when the flame retardancy rating of the upper back cabinet  45  is lowered, it does not affect the product compliance in terms of safety standards. 
         [0272]    According to the television receiving apparatus  1  of embodiment 5, since it is possible to remove only the lower back cabinet  46 , maintenance work for the receiving unit T, power board P, or drive board D can be easily performed. 
         [0273]    Embodiment 5 is as described above, and other than that is the same as embodiments 1 to 4, such that the corresponding parts have the same reference numbers, and a detailed description, operations and effects thereof will be omitted. 
       Embodiment 6 
       [0274]    Embodiment 6 is related to a configuration of two-color molding (double molding) the back cabinet  4  including the back cabinet body  41  and the cover  42 . Therefore, the back cabinet  4  is molded in one body without dividing it into the back cabinet body  41  and the cover  42 . A region corresponding the back cabinet body  41  is made of a high flame retardancy resin material (for example, a rating of V-1 or more), and a region corresponding to the cover  42  is made of a low flame retardancy resin material (for example, a rating of HB). 
         [0275]    Since the back cabinet  4  according to embodiment 6 is molded in one body, when assembling the television receiving apparatus  1 , it is not necessary to combine the region corresponding to the back cabinet body  41  and the cover  42 . Therefore, the back cabinet  4  according to embodiment 6, has no plate-shaped protrusion  41   b , guide protrusion  41   f  as well as locking claw  42   e , plate-shaped protrusions  42   c  and  42   d , and the like, which are included in the back cabinet body  41  and the cover  42 , respectively. 
       Embodiment 6-1 
       [0276]    Embodiment 6-1 is related to a configuration in which partitions are provided between cavities inside of the molds respectively corresponding to the back cabinet body  41  and the cover  42  to mold the back cabinet  4 . 
         [0277]      FIG. 45  is a cross-sectional view illustrating an example of a mold  5  for molding the back cabinet  4 . The top and bottom direction in  FIG. 45  correspond to the top and bottom side of the back cabinet  4 , respectively. The right and left directions in  FIG. 45  correspond to the upper side and underside of the back cabinet  4 , respectively.  FIG. 45  is a cross-sectional view of the mold  5  taken by cutting in a sectional plane parallel to a vertical direction and the normal line of the back cabinet  4 . 
         [0278]    The mold  5  includes a male mold  51 , a female mold  52  and a partition part  53 . The male mold  51  is a movable core, and the female mold  52  is a fixed cavity. The female mold  52  has runners  521 ,  522  and  523  which are flow passages for a resin material to be filled in cavities  54  and  55  inside the mold  5 . The runner  521  is a flow passage for forming a region corresponding to the cover  42 . The runners  522  and  523  are flow passages for forming a region corresponding to the back cabinet body  41 . The mold  5  is closed (clamped) and open by sliding the male mold  51 , for example. 
         [0279]      FIG. 46  is a view for explaining a state in which the partition part  53  is overlapped with the back cabinet body  41 . 
         [0280]      FIG. 46  illustrates the back cabinet body  41  and the partition part  53  as seen from the rear side of the television receiving apparatus  1 . The partition part  53  is a frame-shaped member disposed in a portion of the female mold  52  corresponding to the periphery of the opening part  41   a  of the back cabinet body  41 . The partition part  53  has a function of blocking the resin material so as not to flow into the cavity  54 , corresponding to the back cabinet body  41 , when the resin material is injected into the cavity  55 , corresponding to the cover  42 , in the mold. The width of the frame of the partition part  53  as seen from the front side is identical to the width of the groove  43 , for example. The groove  43  is a space formed between the outer edge of the shelf  41   m  in the peripheral edge part of the opening part  41   a  and the periphery of the cover  42  (see  FIGS. 3 ,  32  and  34 B). 
         [0281]    Next, a method of molding the back cabinet  4  according to embodiment 6-1 will be described. First, the female mold  52  is mounted in the partition part  53 , and the mold  5  is closed by sliding the male mold  51 . Then, a low flame retardancy resin material is injected into the cavity  55  corresponding to the cover  42  from a nozzle through the runner  521 . After the low flame retardancy resin material forming the cover  42  (for example, after 2 or three minutes passes from the ending of the injection) is cooled, the mold  5  is opened, and then the partition part  53  is taken out from the female mold  52 . Thereafter, the mold  5  is closed again. Next, a high flame retardancy resin material is injected into the cavity  54  corresponding to the back cabinet body  41  from the nozzle through the runners  522  and  523 . In a step that the high flame retardancy resin material forming the back cabinet body  41  has been cooled, the mold  5  is opened, and then the molded part of the back cabinet  4  is taken out from the mold  5 . 
         [0282]    The inner cylinder  41   c  and the outer cylinder  41   d  made of a high flame retardancy resin are formed around the region corresponding to the cover  42  in the underside surface (the front side of the television receiving apparatus  1 ) of the back cabinet  4  formed by the mold  5 . The inner cylinder  41   c  and the outer cylinder  41   d  provide a function of the enclosure. 
         [0283]    Further, it is possible to elongate the partition part  53  in a direction of the male mold  51  in  FIG. 45 , without providing the inner cylinder  41   c  and the outer cylinder  41   d . After taking out the partition part  53  and closing the mold  5 , the injected high flame retardancy resin material fills the cavity  54  occupied by the partition part  53 . By increasing the height of the partition part  53  toward the front side of the television receiving apparatus  1 , the high flame retardancy resin material filled in the cavity  54  occupied by the partition part  53  forms a side providing a function of the enclosure. 
         [0284]    In embodiment 6-1, the region corresponding to the cover  42  is molded, and then the region corresponding to the back cabinet body  41  is molded. However, these parts may be molded in reverse order. That is, the region corresponding to the back cabinet body  41  may be molded, and then the region corresponding to the cover  42  may be molded. 
         [0285]    In embodiment 6-1, the processes of mounting and taking out the partition part  53  are included in the cycle for forming the back cabinet  4 , but it is possible to mold the back cabinet  4  in one cycle from the process of closing the mold to the process of taking out the molded part through the mold opening stroke. 
       Embodiment 6-2 
       [0286]    Embodiment 6-2 is related to a configuration that, after the region corresponding to the cover  42  is molded in advance, the molded cover  42  is mounted in the female mold  52 , and then the region corresponding to the back cabinet body  41  is molded. 
         [0287]      FIG. 47  is a cross-sectional view illustrating another example of a mold  50  for molding the back cabinet  4 . The top and bottom direction in  FIG. 47  correspond to the top and bottom side of the back cabinet  4 , respectively. The right and left directions in  FIG. 47  correspond to the upper side and underside of the back cabinet  4 , respectively.  FIG. 47  is a cross-sectional view of the mold  50  taken by cutting in a sectional plane parallel to the vertical direction and the normal line of the back cabinet  4 . 
         [0288]    The mold  50  includes a male mold  510  and a female mold  520 . The male mold  510  is a movable core, and the female mold  520  is a fixed cavity. The female mold  520  has runners  524  and  525  which are flow passages for a resin material to be filled in cavity  540  portion inside the mold  50 . The runners  524  and  525  are flow passages for forming the site corresponding to the back cabinet body  41 . The mold  50  is closed and open by sliding the male mold  510 , for example. 
         [0289]    Cavities  540  and  541  are formed inside of the closed mold  50 . The cavity  540  is a space corresponding to the back cabinet body  41 , and the cavity  541  is a space corresponding to the cover  42 , respectively. The site of the cavity  540  contacting with the cavity  541  is a site corresponding to the back cabinet body  41  contacting the site corresponding to the cover  42 , and is protruded to the front side of the television receiving apparatus  1 . A high flame retardancy resin material filled into the protruded cavity  540  forms the site having a function of the enclosure. 
         [0290]    Next, a method of molding the back cabinet  4  according to embodiment 6-2 will be described. First, the site of the back cabinet  4  corresponding to the cover  42  is molded. For this, a mold (not illustrated) for molding the site of the back cabinet  4  corresponding to the cover  42  is prepared. A low flame retardancy resin material is injected into the prepared mold, the low flame retardancy resin material is cooled, and then the molded part relating to the site of the back cabinet  4  corresponding to the cover  42  is taken out form the mold. 
         [0291]    A member of the back cabinet  4  corresponding to the previously formed cover  42  is mounted in the female mold  520  corresponding to the cavity  541 . The mold  50  is closed by sliding the male mold  510 . Then, a high flame retardancy resin material is injected into the cavity  540  corresponding to the back cabinet body  41  from the nozzle through the runners  524  and  525 . After the high flame retardancy resin material forming the site corresponding to the back cabinet body  41  is cooled, the mold  50  is open, and then the molded part of the back cabinet  4  is taken out from the mold  50 . 
       Embodiment 6-3 
       [0292]    Embodiment 6 is related to a configuration in which runners for injecting a high flame retardancy resin material and a low flame retardancy resin material into cavities of a mold respectively corresponding to the back cabinet body  41  and the cover  42 , and the high and low flame retardancy resin materials are simultaneously injected into the mold through the respective runners. 
         [0293]      FIG. 48  is a cross-sectional view illustrating another example of a mold  500  for molding the back cabinet  4 . The top and bottom direction in  FIG. 48  correspond to the top and bottom side of the back cabinet  4 , respectively. The right and left directions in  FIG. 48  correspond to the upper side and underside of the back cabinet  4 , respectively.  FIG. 48  is a cross-sectional view of the mold  500  taken by cutting in a sectional plane parallel to the vertical direction and the normal line of the back cabinet  4 . 
         [0294]    The mold  500  includes a male mold  550  and a female mold  560  male. The male mold  550  is a movable core, and the female mold  560  is a fixed cavity. 
         [0295]    Cavities  542  and  543  are formed inside of the closed mold  500 . The cavity  542  is a space corresponding to the back cabinet body  41 , and the cavity  543  is a space corresponding to the cover  42 , respectively. 
         [0296]    The female mold  560  has runners  526  to  533  which are flow passages of the resin material filled in the cavities  542  and  543  inside of the mold  500 . Runners  526 ,  527 ,  528 ,  529  and  530  are flow passages for molding the site corresponding to the back cabinet body  41 . The runners  531 ,  532 , and  533  are flow passages for molding the site corresponding to the cover  42 . 
         [0297]    The mold  500  is closed and open by sliding the male mold  550 , for example. 
         [0298]    Boundaries of the cavity  542  and the cavity  543  are disposed between gates for the runner  527  and the runner  531 , as well as between gates for the runner  528  and the runner  533 . It is preferable that the boundary between the region corresponding to the back cabinet body  41  and the region corresponding to the cover  42  in the back cabinet  4  after forming is not significantly shifted by the flow of the resin material. For this, the gate for the runner  527  and the runner  531 , as well as the gate for the runner  528  and the runner  533  are located adjacent to the boundary between the cavity  542  and the cavity  543 . 
         [0299]    Next, a method of molding the back cabinet  4  according to embodiment 6-3 will be described. 
         [0300]    First, the mold  500  is closed by sliding the male mold  550 . Then, a high flame retardancy resin material is injected into the cavity  542  of the site corresponding to the back cabinet body  41  from the nozzle through the runners  526  to  530 . At the same time, a low flame retardancy resin material is injected into the cavity  543  of the site corresponding to the cover  42  from the nozzle through the runners  531  to  532 . After the high and low flame retardancy resin materials are cooled, the mold  500  is open, and then the molded part of the back cabinet  4  is taken out form the mold  500 . 
         [0301]    According to the back cabinet  4  of embodiment 6-3, the region corresponding to the back cabinet body  41  and the region corresponding to the cover  42  are formed simultaneously by two-color molding in one cycle. Therefore, molding efficiency of the back cabinet  4  in embodiment 6-3 is high. 
         [0302]    The mold  500  has no partition part such as the partition part  53  of the mold  5  in embodiment 6-1. Therefore, the low and high flame retardancy resin materials are partially mixed during the injecting or pressure maintaining process. Accordingly, the boundary between the back cabinet body  41  to be an enclosure and the cover  42  may be shifted in terms of the safety so as to meet the safety standards. That is, the position of the gate for separately injecting the low and high flame retardancy resin materials may be shifted in a direction to further decrease the area of the portion corresponding to the cover  42 , or a direction to narrow the cavity  543  in  FIG. 48 . 
         [0303]    In embodiment 6, the regions which are respectively corresponding to the back cabinet body  41  and the cover  42  of embodiment 1 are molded in one body by the two-color molding. However, the present invention is not limited thereto, and the regions which are respectively corresponding to the upper back cabinet  45  and the lower back cabinet  46  of embodiment 5 may also be formed in one body by the two-color molding. In this case, a method for providing the partition part in the mold may be considered. In addition, a method that, after the region corresponding to the upper back cabinet  45  or the lower back cabinet  46  is molded in advance, the molded region is mounted in the mold, and then the remaining region is molded, may also be considered. Further, a method that, by injecting the high and low flame retardancy resin materials into the mold simultaneously, the region respectively corresponding to the upper back cabinet  45  and the lower back cabinet  46  is molded simultaneously, may also be considered. 
         [0304]    According to the manufacturing method of the back cabinet  4  of embodiment 6, the region made of the high flame retardancy resin material and the region made of the low flame retardancy resin material can be integrally molded in a short time. Therefore, according to the manufacturing method of the back cabinet  4  of embodiment 6, it is possible to reduce the manufacturing costs of the back cabinet  4 . 
         [0305]    When the region made of the high flame retardancy resin material and the region made of the low flame retardancy resin material are molded separately, each part needs to provide a structure for combining these regions. Further, in the assembling work of the television receiving apparatus  1 , a process for combining these regions is required. However, when assembling the television receiving apparatus  1  by the back cabinet  4  molded by the manufacturing method according to embodiment 6, it is possible to use the back cabinet  4  in which the region made of the high flame retardancy resin material and the region made of the low flame retardancy resin material are molded in one body from the beginning. Therefore, according to the manufacturing method of the back cabinet  4  of embodiment 6, it is possible to reduce the costs and time required for assembling the television receiving apparatus  1 . 
         [0306]    Embodiment 6 is as described above, and other than that is the same as embodiments 1 to 5, such that the corresponding parts have the same reference numbers, and a detailed description, operations and effects thereof will be omitted. 
         [0307]    As this invention may be embodied in several forms without departing from the spirit of essential characteristics thereof, the present embodiments are therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within metes and bounds of the claims, or equivalence of such metes and bounds thereof are therefore intended to be embraced by the claims.