JP2006320783A - Dismantling method of plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dismantling method of a plasma display device allowing recycling at low cost. <P>SOLUTION: In this dismantling method of a plasma display device composed by housing a panel member provided with a plasma display panel 14, a chassis 18 disposed in the rear face thereof, and electric circuit members 20 attached on the rear face of the chassis 18 with attaching means (screws 22, bosses 18a), the panel member is removed from a casing, placed in front of a cutting means (saw blade 32), at least one of the cutting means or panel member is moved so that the cutting means passes through between the rear face of the chassis 18 and electric circuit members 20 to cut the attaching means, to separate the electric circuit members 20 from the panel member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for disassembling a plasma display device.

  The plasma display device is a plasma display panel in which a pair of glass substrates on which a plurality of electrodes and the like are formed are arranged so as to face each other so that a discharge space is formed between the glass substrates, and the periphery is sealed with a sealing material. A PDP module comprising a (PDP), a metal chassis attached to the PDP via a heat conductive sheet, and an electric circuit member attached to the rear surface of the chassis is composed of a front cover and a rear cover. It is provided inside the housing.

In recent years, since the plasma display device is a self-luminous type and has good visibility, and is a thin display device capable of displaying a large screen, its demand is increasing. In addition, recycling of home appliances has been regarded as important from the viewpoint of effective use of resources and the like, and recycling technology of plasma display devices is also being studied (for example, see Patent Document 1).
JP 2003-112155 A

  For example, when recycling a 42-type plasma display device, remove the back cover by removing thirty or more screws, and then remove the front cover by removing ten or more screws, so that the PDP inside the housing is removed. The module can be removed. There are about 30 to 50 electrical circuit members in the PDP module, each of which is fixed by a plurality of screws. Furthermore, device components such as a fan, a tuner, and a signal terminal are also fixed with screws. In the entire PDP module, the number of fixed screws reaches about 300. When such a plasma display device is disassembled and recycled, it takes about 10 minutes as a screw removal time for the back cover and the front cover, and about 30 minutes as a time for removing an electric circuit member of the PDP module. On the other hand, the cathode ray tube television has about 20 screws at most, and since the rational design is advanced, the time required for removing the screws and disassembling is within 3 minutes.

  It is economically important to recycle home appliances at a low cost, but at present, the time required for disassembling and disassembling screws in plasma display devices is longer than in the case of CRT televisions. It has become a problem in carrying out recycling at low cost.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a method for disassembling a plasma display device that can be recycled at low cost.

In order to achieve the above object, the present invention provides a panel member comprising a plasma display panel, a chassis disposed on the back surface of the plasma display panel, and an electric circuit member attached to the back surface of the chassis by attachment means. Is disassembled in a casing, and after the panel member is taken out of the casing, the panel member is disposed in front of cutting means, and the cutting means Separating the electrical circuit member from the panel member by moving at least one of the cutting means or the panel member so as to pass between the rear surface of the chassis and the electrical circuit member, and cutting the attachment means. A dismantling method for a plasma display device.

  According to the present invention, the electric circuit member can be separated from the chassis in a short time, and the cost of recycling the plasma display device can be reduced.

  According to a first aspect of the present invention, there is provided a panel member comprising a plasma display panel, a chassis disposed on the back surface of the plasma display panel, and an electric circuit member attached to the back surface of the chassis by attachment means. A method for disassembling a plasma display device accommodated in a body, wherein after the panel member is taken out of the housing, the panel member is disposed in front of a cutting means, and the cutting means is disposed on the rear surface of the chassis. And cutting the attachment means by moving at least one of the cutting means or the panel member so as to pass between the electric circuit member and the electric circuit member, and separating the electric circuit member from the panel member. A method for disassembling a plasma display device.

  According to a second aspect of the present invention, in the first aspect of the present invention, the discharge device is disposed behind the cutting means, and the electric circuit member separated from the panel member is removed from the top of the panel member by the discharge device. It is characterized by removing.

  According to a third aspect of the present invention, in the first aspect of the invention, a saw blade is used as the cutting means, and the attachment means is cut in a state where the short side of the chassis forms an acute angle with the blade edge of the saw blade. The circuit member is separated from the panel member.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, a saw blade is used as the cutting means, and the panel member is disposed in front of the cutting means so that the plasma display panel is on the lower side. The attachment means is cut by moving a panel member to the rear of the saw blade.

  According to a fifth aspect of the invention, there is provided the electric circuit member according to the fourth aspect of the invention, wherein a table is arranged behind the saw blade, and the attachment means is cut by the saw blade so as to be separated from the panel member. It is mounted on the table.

  The invention according to claim 6 is the invention according to claim 5, wherein the thickness of the table is larger than the thickness of the saw blade, and the end of the table facing the saw blade is tapered. It is characterized by being formed.

  According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the electric circuit member loaded on the table is removed from the table.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the structure of the PDP used in the plasma display device will be described with reference to FIG. As shown in FIG. 1, a plurality of display electrodes 4 that are paired with a stripe-shaped scanning electrode 2 and a stripe-shaped sustaining electrode 3 are formed on a glass front substrate 1 so as to cover the display electrode 4. A dielectric layer 5 is formed on the dielectric layer 5, and a protective layer 6 is formed on the dielectric layer 5. Thus, on the front substrate 1, the surface layer which consists of the display electrode 4, the dielectric material layer 5, and the protective layer 6 is formed, and the front board 7 is comprised by this.

A plurality of stripe-shaped address electrodes 9 are formed on the glass back substrate 8.
A dielectric layer 10 is formed so as to cover the address electrodes 9. A partition wall 11 parallel to the address electrode 9 is disposed on the dielectric layer 10 between the address electrodes 9, and a phosphor layer 12 is provided on the dielectric layer 10 between the adjacent partition walls 11. As described above, the surface layer including the address electrodes 9, the dielectric layer 10, the barrier ribs 11, and the phosphor layers 12 is formed on the back substrate 8, thereby forming the back plate 13.

  The front substrate 1 and the rear substrate 8 are arranged to face each other with a minute discharge space so that the display electrode 4 and the address electrode 9 are three-dimensionally intersected at right angles, and the periphery is a glass frit (sealing material). ), And in the discharge space, for example, a mixed gas of neon and xenon is sealed as a discharge gas. Further, a discharge cell is provided at a portion where the display electrode 4 and the address electrode 9 intersect three-dimensionally, and each of the discharge cells has a phosphor that emits red, green, and blue light along the longitudinal direction of the display electrode 4. The layers 12 are sequentially arranged one by one.

  In the panel having such a configuration, an address pulse should be applied to the address electrode 9 and a scan pulse should be applied to the scan electrode 2 to perform an address discharge between the address electrode 9 and the scan electrode 2, so that display should be performed. After the discharge cell is selected, a sustain discharge is performed between the scan electrode 2 and the sustain electrode 3 by applying a periodic sustain pulse that is alternately inverted between the scan electrode 2 and the sustain electrode 3. Image display is performed by exciting and emitting the phosphor layer 12 with ultraviolet rays generated by the sustain discharge.

  FIG. 2 shows an example of the overall configuration of a plasma display device incorporating the panel having the structure described with reference to FIG.

  In FIG. 2, the housing that accommodates the PDP 14 and the like includes a front cover 15 and a metal back cover 16, and the front cover 15 has a front surface made of glass or the like that also serves to protect the optical filter and the PDP 14. Glass 17 is arranged. For example, silver deposition is performed on the front glass 17 in order to suppress unnecessary radiation of electromagnetic waves. The back cover 16 is provided with a plurality of vent holes 16a for releasing heat generated by the PDP 14 and the like to the outside. The back cover 16 is fixed with a plurality of screws 21, and about 30 screws 21 are used in a plasma display device used in a 42-inch television.

  On the back surface of the PDP 14, a chassis 18 made of aluminum or the like and serving as a holding member for holding the PDP 14 is disposed via a heat conductive sheet 19, and on the back surface of the chassis 18, a plurality of electric devices for driving the PDP 14 are disposed. A circuit member 20 is attached to form a panel member (PDP module). The electric circuit member 20 includes an electric circuit for driving and controlling the display of the PDP 14, and a plurality of flexible terminals extending to the electrode terminals formed on the edge of the PDP 14 beyond the four edges of the chassis 18. They are electrically connected by a wiring board (FPC, not shown). About 30 to 50 electric circuit members 20 are provided in total. The heat conductive sheet 19 is for efficiently transferring the heat generated in the PDP 14 to the chassis 18 to release heat, and is bonded to each of the PDP 14 and the chassis 18 with an adhesive.

  On the rear surface of the chassis 18, a boss portion 18 a for attaching the electric circuit member 20 and fixing the back cover 16 is protruded by integral molding using die casting or the like. Further, reinforcing ribs 18 b are provided on the back surface of the chassis 18. For example, the reinforcing rib 18b has a lattice shape, and each side of the lattice is configured to be parallel to the long side and the short side of the chassis 18. The chassis 18 may be provided with a boss portion 18a by fixing a fixing pin to an aluminum flat plate. Thus, the chassis 18 has a flat plate-like portion and protruding portions such as the boss portion 18a and the reinforcing rib 18b.

  The electric circuit members 20 are fixed to the boss portions 18a using screws 22 respectively. The screw 22 and the boss portion 18a constitute attachment means, and the electric circuit member 20 is attached to the rear surface of the chassis 18 by this attachment means. In a plasma display device used in a 42-inch television, the number of screws 22 is large, about 250 to 300. In a plasma display device used for a 50-inch television, the number of screws 22 is further increased. Further, although not shown, members such as a cooling fan and a tuner signal terminal are fixed to the chassis 18 with screws 22, and these members are also included in the electric circuit member 20.

  FIG. 3 shows a recycling process of a plasma display device (PDP television) used as a television. In the case of the PDP television to be discarded (discarded PDP television), in the housing removal step 23, first, the screws 21 fixing the back cover 16 are removed, and then the screws not shown in FIG. Take out from. In the next electric circuit member disassembly step 24, the electric circuit member 20 attached to the chassis 18 is separated from the panel member, and this separation method will be described later. Next, the chassis separation process 25 which separates into the PDP14, the chassis 18, and the heat conductive sheet 19 is performed by heating the panel member which isolate | separated the electric circuit member 20 to predetermined temperature, and applying peeling force. The separated PDP 14 is subjected to a substrate separation process 26 in which a peripheral sealing portion is removed by a method such as cutting and separated into a front plate 7 and a back plate 13. Thereafter, the front plate 7 is made into a bare glass substrate by removing the surface layer on the front substrate 1 by a method such as polishing in the surface layer removing step 27, and the back plate 13 is formed on the back substrate 8 in the surface layer removing step 28. The surface layer is removed by a method such as polishing to form a bare glass substrate. The raw glass substrate is culleted, and the cullet glass obtained by the cullet melting is melted so that the glass can be recycled.

  Next, the implementation method of the electric circuit member disassembly process 24 shown in FIG. 3 is demonstrated using drawing.

  FIG. 4 is a plan view of the dismantling device 30 used in the electric circuit member disassembling step 24, and shows a state in which the panel member 29 taken out from the housing in the housing removing step 23 is set in the dismantling device 30. FIG. 5 is a view of the vicinity of the panel member 29 set in FIG. 4 as viewed from the Z direction. The dismantling device 30 includes a conveyance unit 31 that conveys the panel member 29, a saw blade (cutting means) 32 such as a band saw that moves in the direction of arrow A, a position regulation unit 33 that regulates the position of the panel member 29, and a panel This is an apparatus having a belt-like transport device 34 that moves the member 29 in the direction of arrow B, a discharge device 35 that can be moved in the direction of arrow C, and a belt-like transport device 36 that transports the member 29 in the direction of arrow E. . A plurality of transport rollers are arranged in the transport unit 31. When the portion of the saw blade 32 is viewed from the side, as shown in FIG. 6, the saw blade 32 is looped over the cylindrical drive rollers 39 arranged on the left and right sides, and the drive roller 39 rotates. Thus, the upper saw blade 32 is configured to move in the direction of arrow A. The thickness of the saw blade 32 is about 1 mm, and the moving speed when moving in the direction of arrow A is set to about 900 mm / sec. Further, as shown in FIG. 5, the upper saw blade 32 is disposed so as to be positioned above the surface of the planar portion of the chassis 18 by a distance d when the panel member 29 is placed on the transport unit 31. The distance d is set to 1 to 3 mm. These values need to be set to appropriate values according to the type of the panel member 29 and the like. Further, the transport device 34 and the transport device 36 have a structure in which a belt is looped around two drive rollers, similarly to the structure of the saw blade 32.

  Next, a method for performing the electric circuit member disassembly process 24 using the disassembly apparatus 30 will be described.

First, as shown in FIG. 4, the panel member 29 is placed on the transport unit 31 so that the PDP 14 is on the lower side and the chassis 18 is on the upper side. That is, the panel member 29 is disposed in front of the saw blade 32 so that the PDP 14 is on the lower side. At this time, the position regulating means 33 is set so that the short side of the panel member 29 forms an angle θ with the saw blade 32. Then, by moving the position restricting means 33 by a driving means (not shown), the panel member 29 is moved in the direction of the arrow B at a moving speed of about 10 to 20 mm / second.

  When the panel member 29 is moved in the direction of arrow B from the state of FIG. 4, the saw blade 32 starts cutting the boss portion 18a. When the saw blade 32 is further moved in the direction of arrow B, the saw blade 32 starts cutting the reinforcing rib 18b. At this time, since the panel member 29 is at an angle θ (acute angle) with respect to the saw blade 32, the area of the portion where the reinforcing rib 18b is simultaneously cut by the saw blade 32 does not become extremely large. The load applied to the saw blade 32 sometimes does not become excessive, and stable cutting is possible. In this way, the boss portion 18a attached to the chassis 18 is collectively cut by moving the panel member 29 so that the saw blade 32 passes between the back surface of the chassis 18 and the electric circuit member 20. The electric circuit member 20 is separated from the panel member 29. For example, when the length of the long side of the chassis 18 is about 1000 mm (corresponding to a 42-type plasma display device), the boss portion 18a of the chassis 18 can be cut in about 80 to 120 seconds. The time required to remove the electric circuit member 20 from the chassis 18 by removing the screws 22 was about 30 minutes, but according to this method, it can be shortened to about 2 minutes, and the recycling of the plasma display device can be reduced. Cost reduction can be achieved. Depending on the length and mounting structure of the boss portion 18a and the screw 22, the boss portion 18a and the screw 22 are cut by the saw blade 32. When the height of the reinforcing rib 18b is low, the reinforcing rib 18b may not be cut.

  FIG. 7 shows a state where the cutting of the boss portion 18a is completed by moving the panel member 29 in the direction of arrow B from the state of FIG. 4 and moving the panel member 29 to the rear of the saw blade 32. In the state shown in FIG. 7, the discharge device 35 disposed behind the saw blade 32 is moved in the direction of arrow C. As a result, the cut electric circuit member 20 and the boss portion 18a on the panel member 29 are pushed out by the discharge device 35 and removed from the panel member 29, and moved onto the transport device 36 as shown in FIG. . Thereafter, the conveying device 36 is driven in the direction of arrow E by a driving device (not shown), and the cut electric circuit member 20 and the boss portion 18a are conveyed and stored in a storage box (not shown). The stored electric circuit member 20 and boss portion 18a are sent to the regeneration process. Thereby, the electric circuit member 20 separated from the panel member 29 can be discharged in a short time, and the processing speed can be increased. Further, the panel member 29 from which the electric circuit member 20 and the like have been removed is manually removed from the transport device 34.

  With the above operation, the electric circuit member 20 is removed from the panel member 29, and the electric circuit member disassembling step 24 is completed.

Next, another embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is a configuration diagram showing a part of the disassembling apparatus. The difference from the disassembling apparatus 30 described in FIGS. 4 and 5 is that a table 37 and a conveying roller 38 are provided instead of the conveying apparatus 34. Other configurations are the same as those of the dismantling apparatus 30. The table 37 is disposed behind the saw blade 32, and a plurality of transport rollers 38 are disposed with a space S below the table 37. The space S is dimensioned so that the panel member 29 obtained by cutting the boss portion 18 a of the chassis 18 can pass between the transport roller 38 and the table 37. The thickness of the table 37 is t1, the surface 37a that is close to the saw blade 32 is tapered, and the thickness of the tip of the tapered portion is smaller than the thickness t0 of the saw blade 32. Note that t1> t0. The table 37 has a structure in which two stainless steel plates (thickness: about 0.2 mm) whose surface is slippery are used as a surface layer, and a lightweight material such as plastic or aluminum is sandwiched between the two stainless steel plates. The width of the table 37 is about the same as the width of the transport roller 38. As an example, the thickness t0 = 0.
The thickness of the table 37 is t1 = 1.2 mm.

  Next, the implementation method of the electric circuit member disassembly process 24 using the disassembly apparatus shown in FIG. 9 is demonstrated using FIG. 9 and FIG.

  First, as shown in FIG. 9, the panel member 29 is placed on the transport unit 31. At this time, similarly to FIG. 4, the position regulating means 33 sets the short side of the panel member 29 so as to form an angle θ with the saw blade 32. Thereafter, the panel 31 is moved in the direction of the arrow B by driving the transport unit 31 and moving the position restricting means 33 in the direction of the arrow B. As the panel member 29 moves in the direction of arrow B, the boss portion 18a and the reinforcing rib 18b are gradually cut, and the cut electric circuit member 20 is placed on the table 37 as shown in FIG. Further, the chassis 18, the heat conductive sheet 19, and the PDP 14 from which the boss portion 18 a and the reinforcing rib 18 b are cut move to the space S between the transport roller 38 and the table 37. Since the electric circuit member 20 cut from the panel member 29 is placed on the table 37 and t1> t0, the electric circuit member 20 cut halfway is inclined downward and acts as a load on the saw blade 32. There is nothing to do. For this reason, the driving load during movement of the saw blade 32 in the A direction is not increased, and the cutting operation by the saw blade 32 can be stabilized. Further, since the surface 37a of the table 37 close to the saw blade 32 side is tapered, the transfer of the cut electric circuit member 20 to the table 37 becomes smooth, and a continuous and stable cutting operation is possible. .

  The cut electric circuit member 20 is transferred from the table 37 to the transport device 36 by the discharge device 35. The electric circuit member 20 transferred to the transport device 36 is transported in the direction of arrow E and stored in a storage box (not shown). The stored electric circuit member 20 is sent to the regeneration process. Further, the panel member 29 from which the electric circuit member 20 has been removed is manually removed from the transport device 34.

  With the above operation, the electric circuit member 20 is removed from the panel member 29, and the electric circuit member disassembling step 24 is completed.

  9 and 10, the length of the table 37 in the B direction (moving direction of the panel member 29) is the length of the chassis 18 in the B direction (the angle θ as shown in FIG. However, the length of the table 37 in the B direction may be set to be approximately 30 to 50 mm, for example, and may be set to be considerably shorter than the length of the chassis 18 in the B direction. In this case, the electric circuit member 20 is placed on the table 37 at the time of cutting, and the electric circuit member 20 is placed on the chassis 18 when the cutting is completed. By providing the narrow table 37 in this way, it is possible to prevent an increase in load on the saw blade 32 due to the electric circuit member 20 cut halfway falling down, and the electric circuit member 20 to the chassis 18 can be prevented. The configuration of the table 37 by placing can be simplified.

  In the above embodiment, the panel member 29 is moved in the direction of the arrow B. However, the saw blade 32 may be moved in the direction opposite to the arrow B without moving the panel member 29. . Further, the panel member 29 may be moved in the direction of the arrow B, and the saw blade 32 may be moved in the direction opposite to the arrow B. If there is a member that is difficult to cut with the saw blade 32 together with other electric circuit members 20 due to reasons such as the mounting location among the members attached to the rear surface of the chassis 18 with screws 22, Before cutting with the blade 32, the screw 22 may be removed and the member may be removed.

As described above, according to the above embodiment, after the panel member 29 is taken out of the housing, the panel member 29 is disposed in front of the saw blade 32, and the saw blade 32 is connected to the rear surface of the chassis 18 and the electric circuit member. By moving at least one of the saw blade 32 or the panel member 29 so as to pass between the electric circuit member 20 and cutting the attachment means (the boss portion 18a, the screw 22), the electric circuit member 20 is separated from the panel member 29. The electric circuit member 20 can be separated in a short time, and the cost of recycling the plasma display device can be reduced. Moreover, since the panel member 29 can be stably supported by disposing the PDP 14 in the transport unit 31 so that the PDP 14 faces downward, a stable cutting operation can be performed.

The perspective view which shows a part of plasma display panel used for the plasma display apparatus disassembled in one embodiment of this invention Exploded perspective view showing the entire configuration of the plasma display device Recycling process diagram of the plasma display device The top view which shows schematic structure of the disassembly apparatus used at an electric circuit member disassembly process View of the vicinity of the panel member set in the dismantling device as seen from the Z direction Side view showing the configuration of the saw blade of the dismantling device The figure which shows the state which cutting of the boss | hub part of the chassis was completed The figure explaining discharge operation of an electric circuit member The figure which shows the partial structure of the dismantling apparatus by other embodiment. The figure which shows the state which the cutting | disconnection of the boss | hub part of the chassis was completed using the same dismantling apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 14 Plasma display panel 18 Chassis 18a Boss part 18b Reinforcement rib 20 Electric circuit member 21, 22 Screw 29 Panel member 30 Disassembly apparatus 31 Conveyance part 32 Saw blade 33 Position control means 34, 36 Conveyance apparatus 35 Ejection apparatus

Claims (7)

A plasma comprising a plasma display panel, a chassis disposed on the back surface of the plasma display panel, and a panel member including an electric circuit member attached to the back surface of the chassis by attachment means. A method for disassembling a display device, wherein after removing the panel member from the housing, the panel member is disposed in front of a cutting means, and the cutting means is disposed between the rear surface of the chassis and the electric circuit member. A method for disassembling a plasma display device, wherein at least one of the cutting means or the panel member is moved so as to pass, the attachment means is cut, and the electric circuit member is separated from the panel member. 2. The method for disassembling a plasma display device according to claim 1, wherein a discharge device is disposed behind the cutting means, and the electric circuit member separated from the panel member is removed from the panel member by the discharge device. 2. The plasma according to claim 1, wherein a saw blade is used as the cutting means, the attachment means is cut in a state where the short side of the chassis forms an acute angle with the blade edge of the saw blade, and the electric circuit member is separated from the panel member. Dismantling method of display device. Using a saw blade as the cutting means, placing the panel member in front of the cutting means so that the plasma display panel is on the lower side, and cutting the attachment means by moving the panel member to the rear of the saw blade The method for disassembling a plasma display device according to claim 1. 5. The plasma display apparatus according to claim 4, wherein a table is disposed behind the saw blade, and an electric circuit member separated from a panel member by cutting attachment means by the saw blade is loaded on the table. Dismantling method. 6. The dismantling of the plasma display device according to claim 5, wherein a thickness of the table is larger than a thickness of the saw blade, and an end portion of the table facing the saw blade is formed in a tapered shape. Method. 6. The method of disassembling a plasma display device according to claim 5, wherein an electric circuit member loaded on the table is removed from the table.

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