US20030220051A1 - Conditioning disk actuating system - Google Patents
Conditioning disk actuating system Download PDFInfo
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- US20030220051A1 US20030220051A1 US10/301,197 US30119702A US2003220051A1 US 20030220051 A1 US20030220051 A1 US 20030220051A1 US 30119702 A US30119702 A US 30119702A US 2003220051 A1 US2003220051 A1 US 2003220051A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/017—Devices or means for dressing, cleaning or otherwise conditioning lapping tools
Definitions
- the present invention relates to disks used in the conditioning of polishing pads on chemical mechanical polishers for semiconductor wafers. More particularly, the present invention relates to a new and improved actuating system for raising and lowering a polishing pad conditioning disk in a pad conditioning head of a chemical mechanical polisher.
- Apparatus for polishing thin, flat semiconductor wafers are well-known in the art.
- Such apparatus normally includes a polishing head which carries a membrane for engaging and forcing a semiconductor wafer against a wetted polishing surface, such as a polishing pad. Either the pad or the polishing head is rotated and oscillates the wafer over the polishing surface.
- the polishing head is forced downwardly onto the polishing surface by a pressurized air system or similar arrangement. The downward force pressing the polishing head against the polishing surface can be adjusted as desired.
- the polishing head is typically mounted on an elongated pivoting carrier arm, which can move the pressure head between several operative positions.
- the carrier arm In one operative position, the carrier arm positions a wafer mounted on the pressure head in contact with the polishing pad. In order to remove the wafer from contact with the polishing surface, the carrier arm is first pivoted upwardly to lift the pressure head and wafer from the polishing surface. The carrier arm is then pivoted laterally to move the pressure head and wafer carried by the pressure head to an auxiliary wafer processing station.
- the auxiliary processing station may include, for example, a station for cleaning the wafer and/or polishing head, a wafer unload station, or a wafer load station.
- CMP apparatus has been employed in combination with a pneumatically actuated polishing head.
- CMP apparatus is used primarily for polishing the front face or device side of a semiconductor wafer during the fabrication of semiconductor devices on the wafer.
- a wafer is “planarized” or smoothed one or more times during a fabrication process in order for the top surface of the wafer to be as flat as possible.
- a wafer is polished by being placed on a carrier and pressed face down onto a polishing pad covered with a slurry of colloidal silica or alumina in deionized water.
- FIGS. 1A and 1B A schematic of a typical CMP apparatus is shown in FIGS. 1A and 1B.
- the apparatus 20 for chemical mechanical polishing consists of a rotating wafer holder 14 that holds the wafer 10 , the appropriate slurry 24 , and a polishing pad 12 which is normally mounted to a rotating table 26 by adhesive means.
- the polishing pad 12 is applied to the wafer surface 22 at a specific pressure.
- the chemical mechanical polishing method can be used to provide a planar surface on dielectric layers, on deep and shallow trenches that are filled with polysilicon or oxide, and on various metal films.
- CMP polishing results from a combination of chemical and mechanical effects.
- a possible mechanism for the CMP process involves the formation of a chemically altered layer at the surface of the material being polished. The layer is mechanically removed from the underlying bulk material. An altered layer is then regrown on the surface while the process is repeated again. For instance, in metal polishing, a metal oxide may be formed and removed separately.
- a polishing pad is typically constructed in two layers overlying a platen with the resilient layer as the outer layer of the pad.
- the layers are typically made of polyurethane and may include a filler for controlling the dimensional stability of the layers.
- the polishing pad is usually several times the diameter of a wafer and the wafer is kept off-center on the pad to prevent polishing a non-planar surface onto the wafer.
- the wafer is also rotated to prevent polishing a taper into the wafer. Although the axis of rotation of the wafer and the axis of rotation of the pad are not collinear, the axes must be parallel.
- 1C is plotted with the removal rates in the vertical axis and the distance from the center of the wafer in the horizontal axis. It is seen that the removal rates obtained at the edge portions of the wafer are substantially higher than the removal rates at or near the center of the wafer. The thickness uniformity on the resulting wafer after the CMP process is poor.
- the polishing pad 12 is a consumable item used in a semiconductor wafer fabrication process. Under normal wafer fabrication conditions, the polishing pad is replaced after about 12 hours of usage. Polishing pads may be hard, incompressible pads or soft pads. For oxide polishing, hard and stiffer pads are generally used to achieve planarity. Softer pads are generally used in other polishing processes to achieve improved uniformity and smooth surfaces. The hard pads and the soft pads may also be combined in an arrangement of stacked pads for customized applications.
- a problem frequently encountered in the use of polishing pads in oxide planarization is the rapid deterioration in oxide polishing rates with successive wafers.
- the cause for the deterioration is known as “pad glazing”, wherein the surface of a polishing pad becomes smooth such that slurry is no longer held in between the fibers of the pad. This physical phenomenon on the pad surface is not caused by any chemical reactions between the pad and the slurry.
- the pad conditioning techniques include the use of silicon carbide particles, diamond emery paper, blade or knife for scraping or scoring the polishing pad surface.
- the goal of the conditioning process is to remove polishing debris from the pad surface and re-open pores in the pad by forming micro-scratches in the surface of the pad for improved pad lifetime.
- the pad conditioning process can be carried out either during a polishing process, i.e. known as concurrent conditioning, or after a polishing process.
- a conventional CMP apparatus 50 includes a conditioning head 52 fitted with a conditioning disk 68 , which is formed by embedding or encapsulating diamond particles in nickel coated on the surface of the conditioning disk 68 ; a polishing pad 56 ; and a slurry delivery arm 54 positioned over the polishing pad 56 .
- the conditioning head 52 is mounted on a conditioning arm 58 which is extended over the top of the polishing pad 56 for making a sweeping motion across the entire surface of the polishing pad 56 .
- the slurry delivery arm 54 is equipped with slurry dispensing nozzles 62 which are used for dispensing a slurry solution on the top surface 60 of the polishing pad 56 .
- Surface grooves 64 are further provided in the top surface 60 to facilitate even distribution of the slurry solution and to help entrapping undesirable particles that are generated by coagulated slurry solution or any other foreign particles which have fallen on top of the polishing pad 56 during a polishing process.
- the surface grooves 64 while serving an important function of distributing the slurry, also presents a processing problem when the pad surface 60 gradually wears out after prolonged use.
- the conventional conditioning head 52 typically includes an air cavity 72 in which is slidably disposed a typically rubber diaphragm 70 .
- the conditioning disk 68 is attached to a disk shaft 80 extending through the diaphragm 70 .
- An air intake tube 74 and an air vacuum tube 76 are provided in fluid communication with the air cavity 72 , and each is connected to an air/vacuum source 78 such as an SCM Venturi air/vacuum pump.
- pressurized air is introduced from the air/vacuum source 78 through the air intake tube 74 and into the air cavity 72 , where the air presses downwardly against the diaphragm 70 , which in turn presses the conditioning disk 68 against the polishing pad 56 to score and condition the polishing pad 56 as the disk shaft 80 rotates the conditioning disk 68 .
- the conditioning operation is terminated by withdrawing air from the air cavity 72 through the air vacuum tube 76 , wherein the resulting reduced air pressure in the air cavity 72 raises the diaphragm 70 and withdraws the conditioning disk 68 from contact with the polishing pad 56 .
- One of the problems encountered in operation of the conventional conditioning head 52 is frequent rupturing or reduction in elasticity of the diaphragm 70 after prolonged use. Consequently, pressurized air in the air cavity 72 tends to escape the conditioning head 52 through the diaphragm 70 upon an attempt to press the conditioning disk 68 against the polishing pad 56 for conditioning of the polishing pad 56 . Further, the vacuum pressure in the air cavity 72 is dispelled by leakage of air into the conditioning head 52 through the ruptured diaphragm 70 upon an attempt to withdraw the conditioning disk 68 from the polishing pad 56 . The reduction in air pressure in the air cavity 72 results in inadequate downward force of the conditioning disk 68 against the polishing pad 56 to effectively condition the polishing pad 56 .
- the diaphragm 70 and other components of the conditioning head 52 or vacuum system must be frequently replaced, and the replacement operation may require 3-4 hours to complete, resulting in substantial down time.
- the conditioning head 52 lacks any sensing mechanism to reveal the position of the conditioning disk 68 therein, personnel operating the conditioning head 52 are incapable of readily determining whether the conditioning disk 68 is in the “up” position of FIG. 3 or the “down” position of FIG. 4.
- An object of the present invention is to provide a new and improved conditioning disk actuating system for lowering and raising a conditioning disk in a conditioning head.
- Another object of the present invention is to provide a conditioning disk actuating system for lowering and raising a conditioning disk in a conditioning head, which system includes durable parts to prevent the need for frequent replacement of parts.
- Still another object of the present invention is to provide a system for reliably lowering and raising a conditioning disk in a conditioning head over a period of prolonged operation.
- Yet another object of the present invention is to provide a system which is capable of sensing the “up” or “down” position of a conditioning disk inside a conditioning head for conditioning wafer polishing pads.
- Another object of the present invention is to provide a conditioning disk actuating system which is capable of sustaining a stable downward force against a conditioning disk during conditioning of a polishing pad using the conditioning disk.
- the present invention comprises a new and improved conditioning disk actuating system for raising and lowering a conditioning disk inside a conditioning head for the conditioning of semiconductor wafer polishing pads.
- the system includes a fluid-actuated cylinder which is coupled to a travel hub vertically slidably mounted in a travel housing provided inside the conditioning head.
- the conditioning disk is mounted on the bottom end of a disk shaft carried by the travel hub.
- the fluid-actuated cylinder is operated to selectively lower and raise the travel hub and conditioning disk to press the disk against the polishing pad and remove the disk from the polishing pad, respectively.
- a position sensing mechanism may be provided in the conditioning head for revealing the “up” or “down” position of the conditioning disk.
- FIG. 1A is a cross-sectional view of a conventional chemical mechanical polishing apparatus
- FIG. 1B is an enlarged, cross-sectional view of a section of a wafer and polishing pad with a slurry solution therein between, in a conventional disk polishing operation;
- FIG. 1C is a graph illustrating the changes in removal rates as a function of distance on a wafer after a polishing pad is repeatedly used
- FIG. 2 is a perspective view of a conventional CMP polishing pad with a slurry dispensing arm and a conditioning disk positioned on top;
- FIG. 3 is a schematic view illustrating interior components of a conventional conditioning head, with the diaphragm and conditioning disk components of the conditioning head shown in the “up” position;
- FIG. 4 is a schematic view illustrating interior components of a conventional conditioning head, with the diaphragm and conditioning disk components of the conditioning head shown in the “down” position;
- FIG. 5A is a schematic view illustrating a conditioning disk actuating system of the present invention, with the conditioning disk component of the conditioning head thereof shown in the “up” position;
- FIG. 5B is a schematic view illustrating a conditioning disk actuating system of the present invention, with the conditioning disk component of the conditioning head thereof shown in the “down” position;
- FIG. 6 is a cross-sectional view of a disk shaft component typically used in attaching a conditioning disk to the conditioning head of the present invention, more particularly illustrating an illustrative, threaded technique for mounting the conditioning disk;
- FIG. 7 is an enlarged sectional view of the travel hub component of the present invention, more particularly illustrating an illustrative sensor mechanism for sensing the “up” and “down”positions of the conditioning disk in the conditioning head;
- FIG. 8 is a schematic illustrating an illustrative control system for the present invention.
- FIG. 9 is a cross-sectional view of another embodiment of a pad conditioning head of the present invention.
- FIG. 10 is a schematic view for a disk position detecting system in accordance with the present invention.
- the present invention is directed to a conditioning disk actuating system for selectively lowering and pressing a conditioning disk of a conditioning head against a polishing pad for conditioning of the polishing pad and raising the conditioning disk from contact with the polishing pad after the conditioning operation.
- the system of the present invention is generally indicated by reference numeral 28 and includes a conditioning head 29 mounted on the end of an elongated conditioning arm 85 .
- the conditioning head 29 includes a head interior 30 through which a disk shaft 33 extends.
- the upper end of the disk shaft 33 may be conventionally fitted with a belt gear (not illustrated) which engages a belt and motor (not illustrated) for rotation of the disk shaft 33 inside the head interior 30 .
- a travel housing 31 is mounted in the bottom of the interior 30 and includes an inwardly-extending housing flange 39 .
- a flange interior 43 is defined by the housing flange 39 .
- a travel hub 32 is mounted on the disk shaft 33 and is stationary with respect to the disk shaft 33 as the disk shaft 33 rotates therein. Accordingly, ball bearings (not illustrated) or other mechanism may be provided at the interface of the travel hub 32 and the disk shaft 33 to facilitate smooth rotation of the disk shaft 33 in the travel hub 32 .
- the travel hub 32 is mounted for vertical movement with the disk shaft 33 inside the flange interior 43 .
- a bottom plate 35 is mounted on the bottom surface of the travel housing 31 and is fitted with a central plate opening 49 (FIG. 5B).
- the plate opening 49 accommodates a conditioning disk 36 which is typically removably mounted on the bottom end of the disk shaft 33 , as illustrated in FIG. 5A.
- the conditioning disk 36 is displaced downwardly from the plate opening 49 , as illustrated in FIG. 5B.
- the conditioning disk 36 is typically removably attached to the bottom end of the disk shaft 33 by threading nipple threads 38 on an attachment nipple 37 extending upwardly from the conditioning disk 36 with companion shaft threads 34 inside the disk shaft 33 .
- a magnetic position sensor 88 which may be conventional, may be mounted against the travel housing 31 in the flange interior 43 .
- a magnetic ring 90 circumscribes the travel hub 32 in adjacent contact with the position sensor 88 .
- the position sensor 88 is connected to an alarm or other positioning monitor 92 , which may be conventional, typically by means of wiring 93 . Accordingly, magnetic attraction between the position sensor 88 and the magnetic ring 90 along the various locations on the position sensor 88 is interpreted by the positioning monitor 92 with regard to the vertical location of the travel hub 32 and thus, the disk shaft 33 in the flange housing 43 .
- This readily indicates to operating personnel whether the conditioning disk 36 is in the upper position of FIG. 5A or the lower, operational position of FIG. 5B.
- any suitable alternative vertical positioning monitor known by those skilled in the art may be used to monitor the position of the travel hub 32 inside the flange interior 43 and thus, the “up” or “down” position of the conditioning disk 36 .
- the system 28 of the present invention further includes a fluid-actuated cylinder 44 typically mounted on the bottom portion 86 of the conditioning arm 85 .
- a piston 48 slidably disposed in the housing 45 of the fluid-actuated cylinder 44 is attached to the lower end of a piston shaft 82 .
- a top fluid hose 46 and a bottom fluid hose 47 extend from the housing 45 and are connected to a fluid source 95 , which may be a source of compressed clean, dry air (CDA), or alternatively, a pump and supply mechanism for hydraulic fluid.
- the piston shaft 82 extends upwardly from the piston 48 inside the housing 45 and through an opening (not illustrated) in the bottom portion 86 of the conditioning arm 85 .
- a link coupling 83 is provided on the upper end of the piston shaft 82 inside the conditioning arm 85 .
- a link 40 connects the link coupling 83 to the travel hub 32 .
- the link 40 typically includes a horizontal segment 41 which extends horizontally from the link coupling 83 and a vertical segment 42 which extends downwardly from the extending end of the horizontal segment 41 , through a link opening (not illustrated) provided in the housing flange 39 of the travel hub 32 , and is attached to the travel hub 32 typically by means of a standard base bearing. Accordingly, by operation of the fluid source 95 to introduce fluid under pressure into the fluid-actuated cylinder 44 through the top fluid hose 46 , the fluid pushes downwardly against the top surface of the piston 48 , sliding the piston 48 downwardly in the housing 45 .
- the piston shaft 82 lowers the link coupling 83 , which lowers the link 40 through the link opening in the housing flange 39 .
- This action lowers the travel hub 32 and disk shaft 33 inside the flange interior 43 , and the disk shaft 33 in turn lowers the conditioning disk 36 from the plate opening 49 and against the upper surface of a polishing pad 97 for conditioning thereof, as illustrated in FIG. 5B and hereinafter further described.
- the fluid source 95 to introduce fluid under pressure into the fluid-actuated cylinder 44 through the bottom fluid hose 47 , the fluid pushes upwardly against the bottom surface of the piston 48 , thereby sliding the piston 48 upwardly in the housing 45 .
- the piston shaft 82 raises the link coupling 83 , which raises the link 40 through the link opening in the housing flange 39 .
- This action raises the travel hub 32 and disk shaft 33 inside the flange interior 43 , and the disk shaft 33 in turn raises the conditioning disk 36 from the upper surface of the polishing pad 97 and again positions the conditioning disk 36 in the plate opening 49 of the bottom plate 35 , as illustrated in FIG. 5A.
- the system 28 of the present invention is operated to condition a polishing pad 97 supported on a platen 98 of a chemical mechanical polisher (not shown).
- the conditioning head 29 of the present invention is initially positioned over the surface of the polishing pad 97 , and as the platen 98 rotates the polishing pad 97 thereon, a polishing slurry (not illustrated) is deposited on the surface of the rotating polishing pad 97 .
- the fluid-actuated cylinder 44 is operated via the fluid source 95 to lower the travel hub 32 and disk shaft 33 in the conditioning head 29 from the position illustrated in FIG.
- the conditioning head 29 is moved horizontally across the surface of the polishing pad 97 by pivoting action of the conditioning arm 85 , in conventional fashion, the rotating conditioning disk 36 scores and shears the surface of the polishing pad 97 to condition the polishing pad 97 in conventional fashion.
- the fluid source 95 and fluid-actuated cylinder 44 are capable of applying the conditioning disk 36 against the polishing pad 97 at a steady pressure throughout the conditioning operation.
- the rotating conditioning disk 36 is removed from contact with the polishing pad 97 by operating the fluid-actuated cylinder 44 to raise the piston 48 in the housing 45 and thus, raise the travel hub 32 and disk shaft 33 in the conditioning head 29 and remove the conditioning disk 36 from contact with the polishing pad 97 .
- the positioning monitor 92 in conjunction with the position sensor 88 on the stationary travel housing 31 and the magnetic ring 90 on the travel hub 32 , provide a reliable indicator to operating personnel of the relative position of the conditioning disk 36 with respect to the polishing pad 97 throughout the conditioning operation.
- FIG. 8 a schematic is shown illustrating a typical pneumatic control valve system in triplicate for each of three conditioning disk actuating systems of the present invention, located at three respective chemical mechanical polishers (not illustrated) in a semiconductor fabrication facility.
- the fluid source 95 is a source of clean, dry air (CDA)
- the CDA source 95 is pneumatically connected to each of three “up” control valves 4 typically through each of three needle valves 2 that can be used to control the upward speed of each travel hub in the corresponding travel housing.
- Each “up” control valve 4 facilitates flow of CDA into the fluid-actuated cylinder 44 through the bottom fluid hose 47 (FIGS.
- a “down”control valve 6 facilitates flow of CDA into the fluid-actuated cylinder 44 through the top fluid hose 46 thereof to facilitate lowering the travel hub 32 and disk shaft 33 in each conditioning head 29 and pressing the conditioning disk 36 against the polishing pad 97 .
- the “down” control valves 6 are components of the conventional diaphragm-actuated control system (such as the SCM Venturi air/vacuum system) having the conditioning head 52 heretofore described with respect to FIGS. 2 - 4 .
- the fluid-actuated cylinders 44 and the “up” control valves 4 of the present invention may be retrofitted to the “down” control valves 6 as part of the conventional diaphragm-actuated control system. It is understood that the schematic of FIG. 8 represents only one example of a pneumatic valve control system which is suitable for controlling the conditioning disk actuating system of the present invention.
- another embodiment of the pad conditioning head 101 includes a housing 103 which is typically mounted on a head support arm 130 .
- a cylindrical core wall 104 is mounted inside the housing 103
- a cylindrical piston 107 is vertically slidably mounted between the inner surface of the housing 103 and the outer surface of the core wall 104 .
- An upper air cavity 108 is defined above the piston 107
- a lower air cavity 111 is defined beneath the piston 107 .
- At least one upper cavity air opening 128 communicates with the upper air cavity 108 for the introduction of air into the upper air cavity 108 and moving the piston 107 downwardly in the housing 103 .
- At least one lower cavity air opening communicates with the lower air cavity 111 for the introduction of air into the lower air cavity 111 and moving the piston 107 upwardly in the housing 103 .
- An outside O-ring 110 is interposed between the piston 107 and the housing 103 .
- a magnetic ring 109 encircles the piston 107 and is disposed in contact with the inner surface of the housing 103 .
- a position-sensing proximity switch 112 is provided in the housing 103 , in magnetic contact with the magnetic ring 109 , for sensing the vertical position of the piston 107 in the housing 103 , as hereinafter further described.
- An inside O-ring 113 is typically interposed between the inner surface of the piston 107 and the outer surface of the core wall 104 .
- a cylindrical hub 115 having a central hub bore 116 is mounted inside the core wall 104 , with a ball bearing 118 and a needle bearing 121 typically interposed between the outer surface of the hub 115 from the inner surface of the core wall 104 .
- a belt gear 117 which receives a drive belt 123 engaged by a driving mechanism (not shown), is mounted on the upper end of the hub 115 .
- a shaft 120 extends downwardly through the hub bore 116 , and a cylindrical bearing 119 is interposed between the shaft 120 and the hub 115 .
- a travel housing 122 is mounted on the bottom end of the shaft 120 .
- a conditioning disk holder 125 is attached to the travel housing 122 for supporting a conditioning disk 126 on the pad conditioning head 101 .
- the conditioning disk 126 typically threads into the conditioning disk holder 125 , in conventional fashion.
- a travel housing bearing 124 is interposed between the piston 107 and the travel housing 122 .
- the conditioning disk 126 is typically threadably attached to the conditioning disk holder 125 preparatory to conditioning a CMP pad 132 .
- Rotation is transmitted from the belt gear 117 to the conditioning disk 126 through the hub 115 , the cylindrical bearing 119 , the shaft 120 , the travel housing 122 and the conditioning disk holder 125 , respectively.
- the piston 107 slides downwardly in the housing 103 and pushes the travel housing bearing 124 , the travel housing 122 , the conditioning disk holder 125 and the conditioning disk 126 downwardly, such that the conditioning disk 126 is simultaneously rotated and pressed against the CMP pad 132 to be conditioned.
- Pressure of the conditioning disk 126 against the CMP pad 132 may be decreased or terminated by introducing pressurized air into the lower air cavity 111 , such that the piston 107 moves upwardly in the housing 103 and raises the conditioning disk 126 through the housing bearing 124 , the travel housing 122 and the conditioning disk holder 125 .
- the proximity switch 112 continually senses the position of the magnetic ring 109 on the piston 107 and feeds this information back to a timer control box 134 , as shown in FIG. 10, to vary the pressure exerted against the CMP pad 132 by the conditioning disk 126 as a function of time according to the conditioning needs of the CMP pad 132 .
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Abstract
A conditioning disk actuating system for raising and lowering a conditioning disk inside a conditioning head for the conditioning of semiconductor wafer polishing pads. The system includes a fluid-actuated cylinder which is coupled to a travel hub vertically slidably mounted in a travel housing provided inside the conditioning head. The conditioning disk is mounted on the bottom end of a disk shaft carried by the travel hub. The fluid-actuated cylinder is operated to selectively lower and raise the travel hub and conditioning disk to press the disk against the polishing pad and remove the disk from the polishing pad, respectively. A position sensing mechanism may be provided in the conditioning head for revealing the “up” or “down” position of the conditioning disk.
Description
- This is a continuation-in-part (CIP) application of U.S. patent application Ser. No. 10/152,470, filed May 21, 2002.
- The present invention relates to disks used in the conditioning of polishing pads on chemical mechanical polishers for semiconductor wafers. More particularly, the present invention relates to a new and improved actuating system for raising and lowering a polishing pad conditioning disk in a pad conditioning head of a chemical mechanical polisher.
- Apparatus for polishing thin, flat semiconductor wafers are well-known in the art. Such apparatus normally includes a polishing head which carries a membrane for engaging and forcing a semiconductor wafer against a wetted polishing surface, such as a polishing pad. Either the pad or the polishing head is rotated and oscillates the wafer over the polishing surface. The polishing head is forced downwardly onto the polishing surface by a pressurized air system or similar arrangement. The downward force pressing the polishing head against the polishing surface can be adjusted as desired. The polishing head is typically mounted on an elongated pivoting carrier arm, which can move the pressure head between several operative positions. In one operative position, the carrier arm positions a wafer mounted on the pressure head in contact with the polishing pad. In order to remove the wafer from contact with the polishing surface, the carrier arm is first pivoted upwardly to lift the pressure head and wafer from the polishing surface. The carrier arm is then pivoted laterally to move the pressure head and wafer carried by the pressure head to an auxiliary wafer processing station. The auxiliary processing station may include, for example, a station for cleaning the wafer and/or polishing head, a wafer unload station, or a wafer load station.
- More recently, chemical-mechanical polishing (CMP) apparatus has been employed in combination with a pneumatically actuated polishing head. CMP apparatus is used primarily for polishing the front face or device side of a semiconductor wafer during the fabrication of semiconductor devices on the wafer. A wafer is “planarized” or smoothed one or more times during a fabrication process in order for the top surface of the wafer to be as flat as possible. A wafer is polished by being placed on a carrier and pressed face down onto a polishing pad covered with a slurry of colloidal silica or alumina in deionized water.
- A schematic of a typical CMP apparatus is shown in FIGS. 1A and 1B. The
apparatus 20 for chemical mechanical polishing consists of a rotatingwafer holder 14 that holds thewafer 10, theappropriate slurry 24, and apolishing pad 12 which is normally mounted to a rotating table 26 by adhesive means. Thepolishing pad 12 is applied to thewafer surface 22 at a specific pressure. The chemical mechanical polishing method can be used to provide a planar surface on dielectric layers, on deep and shallow trenches that are filled with polysilicon or oxide, and on various metal films. - CMP polishing results from a combination of chemical and mechanical effects. A possible mechanism for the CMP process involves the formation of a chemically altered layer at the surface of the material being polished. The layer is mechanically removed from the underlying bulk material. An altered layer is then regrown on the surface while the process is repeated again. For instance, in metal polishing, a metal oxide may be formed and removed separately.
- A polishing pad is typically constructed in two layers overlying a platen with the resilient layer as the outer layer of the pad. The layers are typically made of polyurethane and may include a filler for controlling the dimensional stability of the layers. The polishing pad is usually several times the diameter of a wafer and the wafer is kept off-center on the pad to prevent polishing a non-planar surface onto the wafer. The wafer is also rotated to prevent polishing a taper into the wafer. Although the axis of rotation of the wafer and the axis of rotation of the pad are not collinear, the axes must be parallel.
- In a CMP head, large variations in the removal rate, or polishing rate, across the whole wafer area are frequently observed. A thickness variation across the wafer is therefore produced as a major cause for wafer non-uniformity. In the improved CMP head design, even though a pneumatic system for forcing the wafer surface onto a polishing pad is used, the system cannot selectively apply different pressures at different locations on the surface of the wafer. This effect is shown in FIG. 1C, i.e. in a profilometer trace obtained on an 8-inch wafer. The thickness difference between the highest point and the lowest point on the wafer is almost 2,000 angstroms, resulting in a standard deviation of 472 angstroms, or 6.26%. The curve shown in FIG. 1C is plotted with the removal rates in the vertical axis and the distance from the center of the wafer in the horizontal axis. It is seen that the removal rates obtained at the edge portions of the wafer are substantially higher than the removal rates at or near the center of the wafer. The thickness uniformity on the resulting wafer after the CMP process is poor.
- The
polishing pad 12 is a consumable item used in a semiconductor wafer fabrication process. Under normal wafer fabrication conditions, the polishing pad is replaced after about 12 hours of usage. Polishing pads may be hard, incompressible pads or soft pads. For oxide polishing, hard and stiffer pads are generally used to achieve planarity. Softer pads are generally used in other polishing processes to achieve improved uniformity and smooth surfaces. The hard pads and the soft pads may also be combined in an arrangement of stacked pads for customized applications. - A problem frequently encountered in the use of polishing pads in oxide planarization is the rapid deterioration in oxide polishing rates with successive wafers. The cause for the deterioration is known as “pad glazing”, wherein the surface of a polishing pad becomes smooth such that slurry is no longer held in between the fibers of the pad. This physical phenomenon on the pad surface is not caused by any chemical reactions between the pad and the slurry.
- To remedy the pad glazing effect, numerous techniques of pad conditioning or scrubbing have been proposed to regenerate and restore the pad surface and thereby restore the polishing rates of the pad. The pad conditioning techniques include the use of silicon carbide particles, diamond emery paper, blade or knife for scraping or scoring the polishing pad surface. The goal of the conditioning process is to remove polishing debris from the pad surface and re-open pores in the pad by forming micro-scratches in the surface of the pad for improved pad lifetime. The pad conditioning process can be carried out either during a polishing process, i.e. known as concurrent conditioning, or after a polishing process.
- Referring next to FIG. 2, a
conventional CMP apparatus 50 includes aconditioning head 52 fitted with aconditioning disk 68, which is formed by embedding or encapsulating diamond particles in nickel coated on the surface of theconditioning disk 68; apolishing pad 56; and aslurry delivery arm 54 positioned over thepolishing pad 56. The conditioninghead 52 is mounted on aconditioning arm 58 which is extended over the top of thepolishing pad 56 for making a sweeping motion across the entire surface of thepolishing pad 56. Theslurry delivery arm 54 is equipped with slurry dispensingnozzles 62 which are used for dispensing a slurry solution on thetop surface 60 of thepolishing pad 56.Surface grooves 64 are further provided in thetop surface 60 to facilitate even distribution of the slurry solution and to help entrapping undesirable particles that are generated by coagulated slurry solution or any other foreign particles which have fallen on top of thepolishing pad 56 during a polishing process. The surface grooves 64, while serving an important function of distributing the slurry, also presents a processing problem when thepad surface 60 gradually wears out after prolonged use. - As illustrated in FIGS. 3 and 4, the
conventional conditioning head 52 typically includes anair cavity 72 in which is slidably disposed a typicallyrubber diaphragm 70. Theconditioning disk 68 is attached to adisk shaft 80 extending through thediaphragm 70. Anair intake tube 74 and anair vacuum tube 76 are provided in fluid communication with theair cavity 72, and each is connected to an air/vacuum source 78 such as an SCM Venturi air/vacuum pump. Accordingly, to facilitate conditioning thepolishing pad 56, pressurized air is introduced from the air/vacuum source 78 through theair intake tube 74 and into theair cavity 72, where the air presses downwardly against thediaphragm 70, which in turn presses theconditioning disk 68 against thepolishing pad 56 to score and condition thepolishing pad 56 as thedisk shaft 80 rotates theconditioning disk 68. The conditioning operation is terminated by withdrawing air from theair cavity 72 through theair vacuum tube 76, wherein the resulting reduced air pressure in theair cavity 72 raises thediaphragm 70 and withdraws theconditioning disk 68 from contact with thepolishing pad 56. - One of the problems encountered in operation of the
conventional conditioning head 52 is frequent rupturing or reduction in elasticity of thediaphragm 70 after prolonged use. Consequently, pressurized air in theair cavity 72 tends to escape theconditioning head 52 through thediaphragm 70 upon an attempt to press theconditioning disk 68 against thepolishing pad 56 for conditioning of thepolishing pad 56. Further, the vacuum pressure in theair cavity 72 is dispelled by leakage of air into theconditioning head 52 through the ruptureddiaphragm 70 upon an attempt to withdraw theconditioning disk 68 from thepolishing pad 56. The reduction in air pressure in theair cavity 72 results in inadequate downward force of theconditioning disk 68 against thepolishing pad 56 to effectively condition thepolishing pad 56. As a result, thediaphragm 70 and other components of theconditioning head 52 or vacuum system must be frequently replaced, and the replacement operation may require 3-4 hours to complete, resulting in substantial down time. Further, since theconditioning head 52 lacks any sensing mechanism to reveal the position of theconditioning disk 68 therein, personnel operating theconditioning head 52 are incapable of readily determining whether theconditioning disk 68 is in the “up” position of FIG. 3 or the “down” position of FIG. 4. - Accordingly, a more durable system is needed for raising and lowering a conditioning disk in a conditioning head of a chemical mechanical polisher to prevent the need for frequent replacement of parts.
- An object of the present invention is to provide a new and improved conditioning disk actuating system for lowering and raising a conditioning disk in a conditioning head.
- Another object of the present invention is to provide a conditioning disk actuating system for lowering and raising a conditioning disk in a conditioning head, which system includes durable parts to prevent the need for frequent replacement of parts.
- Still another object of the present invention is to provide a system for reliably lowering and raising a conditioning disk in a conditioning head over a period of prolonged operation.
- Yet another object of the present invention is to provide a system which is capable of sensing the “up” or “down” position of a conditioning disk inside a conditioning head for conditioning wafer polishing pads.
- Another object of the present invention is to provide a conditioning disk actuating system which is capable of sustaining a stable downward force against a conditioning disk during conditioning of a polishing pad using the conditioning disk.
- In accordance with these and other objects and advantages, the present invention comprises a new and improved conditioning disk actuating system for raising and lowering a conditioning disk inside a conditioning head for the conditioning of semiconductor wafer polishing pads. The system includes a fluid-actuated cylinder which is coupled to a travel hub vertically slidably mounted in a travel housing provided inside the conditioning head. The conditioning disk is mounted on the bottom end of a disk shaft carried by the travel hub. The fluid-actuated cylinder is operated to selectively lower and raise the travel hub and conditioning disk to press the disk against the polishing pad and remove the disk from the polishing pad, respectively. A position sensing mechanism may be provided in the conditioning head for revealing the “up” or “down” position of the conditioning disk.
- The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
- FIG. 1A is a cross-sectional view of a conventional chemical mechanical polishing apparatus;
- FIG. 1B is an enlarged, cross-sectional view of a section of a wafer and polishing pad with a slurry solution therein between, in a conventional disk polishing operation;
- FIG. 1C is a graph illustrating the changes in removal rates as a function of distance on a wafer after a polishing pad is repeatedly used;
- FIG. 2 is a perspective view of a conventional CMP polishing pad with a slurry dispensing arm and a conditioning disk positioned on top;
- FIG. 3 is a schematic view illustrating interior components of a conventional conditioning head, with the diaphragm and conditioning disk components of the conditioning head shown in the “up” position;
- FIG. 4 is a schematic view illustrating interior components of a conventional conditioning head, with the diaphragm and conditioning disk components of the conditioning head shown in the “down” position;
- FIG. 5A is a schematic view illustrating a conditioning disk actuating system of the present invention, with the conditioning disk component of the conditioning head thereof shown in the “up” position;
- FIG. 5B is a schematic view illustrating a conditioning disk actuating system of the present invention, with the conditioning disk component of the conditioning head thereof shown in the “down” position;
- FIG. 6 is a cross-sectional view of a disk shaft component typically used in attaching a conditioning disk to the conditioning head of the present invention, more particularly illustrating an illustrative, threaded technique for mounting the conditioning disk;
- FIG. 7 is an enlarged sectional view of the travel hub component of the present invention, more particularly illustrating an illustrative sensor mechanism for sensing the “up” and “down”positions of the conditioning disk in the conditioning head;
- FIG. 8 is a schematic illustrating an illustrative control system for the present invention;
- FIG. 9 is a cross-sectional view of another embodiment of a pad conditioning head of the present invention; and
- FIG. 10 is a schematic view for a disk position detecting system in accordance with the present invention.
- The present invention is directed to a conditioning disk actuating system for selectively lowering and pressing a conditioning disk of a conditioning head against a polishing pad for conditioning of the polishing pad and raising the conditioning disk from contact with the polishing pad after the conditioning operation. The system of the present invention is generally indicated by
reference numeral 28 and includes aconditioning head 29 mounted on the end of anelongated conditioning arm 85. Theconditioning head 29 includes ahead interior 30 through which adisk shaft 33 extends. The upper end of thedisk shaft 33 may be conventionally fitted with a belt gear (not illustrated) which engages a belt and motor (not illustrated) for rotation of thedisk shaft 33 inside thehead interior 30. Atravel housing 31 is mounted in the bottom of the interior 30 and includes an inwardly-extendinghousing flange 39. Aflange interior 43 is defined by thehousing flange 39. Atravel hub 32 is mounted on thedisk shaft 33 and is stationary with respect to thedisk shaft 33 as thedisk shaft 33 rotates therein. Accordingly, ball bearings (not illustrated) or other mechanism may be provided at the interface of thetravel hub 32 and thedisk shaft 33 to facilitate smooth rotation of thedisk shaft 33 in thetravel hub 32. Thetravel hub 32 is mounted for vertical movement with thedisk shaft 33 inside theflange interior 43. Abottom plate 35 is mounted on the bottom surface of thetravel housing 31 and is fitted with a central plate opening 49 (FIG. 5B). When thetravel hub 32 anddisk shaft 33 are disposed in the uppermost position inside theflange interior 43, the plate opening 49 accommodates aconditioning disk 36 which is typically removably mounted on the bottom end of thedisk shaft 33, as illustrated in FIG. 5A. When thetravel hub 32 anddisk shaft 33 are disposed in the lowermost position inside theflange interior 43, theconditioning disk 36 is displaced downwardly from the plate opening 49, as illustrated in FIG. 5B. As illustrated in FIG. 6, theconditioning disk 36 is typically removably attached to the bottom end of thedisk shaft 33 by threadingnipple threads 38 on anattachment nipple 37 extending upwardly from theconditioning disk 36 withcompanion shaft threads 34 inside thedisk shaft 33. - A
magnetic position sensor 88, which may be conventional, may be mounted against thetravel housing 31 in theflange interior 43. Amagnetic ring 90 circumscribes thetravel hub 32 in adjacent contact with theposition sensor 88. As illustrated in FIG. 7, theposition sensor 88 is connected to an alarm or other positioning monitor 92, which may be conventional, typically by means ofwiring 93. Accordingly, magnetic attraction between theposition sensor 88 and themagnetic ring 90 along the various locations on theposition sensor 88 is interpreted by the positioning monitor 92 with regard to the vertical location of thetravel hub 32 and thus, thedisk shaft 33 in theflange housing 43. This, in turn, readily indicates to operating personnel whether theconditioning disk 36 is in the upper position of FIG. 5A or the lower, operational position of FIG. 5B. It is understood that any suitable alternative vertical positioning monitor known by those skilled in the art may be used to monitor the position of thetravel hub 32 inside theflange interior 43 and thus, the “up” or “down” position of theconditioning disk 36. - As illustrated in FIGS. 5A and 5B, the
system 28 of the present invention further includes a fluid-actuatedcylinder 44 typically mounted on thebottom portion 86 of theconditioning arm 85. Apiston 48 slidably disposed in thehousing 45 of the fluid-actuatedcylinder 44 is attached to the lower end of apiston shaft 82. Atop fluid hose 46 and abottom fluid hose 47 extend from thehousing 45 and are connected to afluid source 95, which may be a source of compressed clean, dry air (CDA), or alternatively, a pump and supply mechanism for hydraulic fluid. Thepiston shaft 82 extends upwardly from thepiston 48 inside thehousing 45 and through an opening (not illustrated) in thebottom portion 86 of theconditioning arm 85. Alink coupling 83 is provided on the upper end of thepiston shaft 82 inside theconditioning arm 85. - As further illustrated in FIGS. 5A and 5B, a
link 40 connects thelink coupling 83 to thetravel hub 32. Thelink 40 typically includes ahorizontal segment 41 which extends horizontally from thelink coupling 83 and avertical segment 42 which extends downwardly from the extending end of thehorizontal segment 41, through a link opening (not illustrated) provided in thehousing flange 39 of thetravel hub 32, and is attached to thetravel hub 32 typically by means of a standard base bearing. Accordingly, by operation of thefluid source 95 to introduce fluid under pressure into the fluid-actuatedcylinder 44 through the topfluid hose 46, the fluid pushes downwardly against the top surface of thepiston 48, sliding thepiston 48 downwardly in thehousing 45. Consequently, thepiston shaft 82 lowers thelink coupling 83, which lowers thelink 40 through the link opening in thehousing flange 39. This action lowers thetravel hub 32 anddisk shaft 33 inside theflange interior 43, and thedisk shaft 33 in turn lowers theconditioning disk 36 from the plate opening 49 and against the upper surface of apolishing pad 97 for conditioning thereof, as illustrated in FIG. 5B and hereinafter further described. Conversely, by operation of thefluid source 95 to introduce fluid under pressure into the fluid-actuatedcylinder 44 through thebottom fluid hose 47, the fluid pushes upwardly against the bottom surface of thepiston 48, thereby sliding thepiston 48 upwardly in thehousing 45. Consequently, thepiston shaft 82 raises thelink coupling 83, which raises thelink 40 through the link opening in thehousing flange 39. This action raises thetravel hub 32 anddisk shaft 33 inside theflange interior 43, and thedisk shaft 33 in turn raises theconditioning disk 36 from the upper surface of thepolishing pad 97 and again positions theconditioning disk 36 in the plate opening 49 of thebottom plate 35, as illustrated in FIG. 5A. - Referring again to FIGS. 5A and 5B, the
system 28 of the present invention is operated to condition apolishing pad 97 supported on aplaten 98 of a chemical mechanical polisher (not shown). Theconditioning head 29 of the present invention is initially positioned over the surface of thepolishing pad 97, and as theplaten 98 rotates thepolishing pad 97 thereon, a polishing slurry (not illustrated) is deposited on the surface of therotating polishing pad 97. Simultaneously, as thedisk shaft 33 and attachedconditioning disk 36 are rotated in theconditioning head 29, the fluid-actuatedcylinder 44 is operated via thefluid source 95 to lower thetravel hub 32 anddisk shaft 33 in theconditioning head 29 from the position illustrated in FIG. 5A to the position illustrated in FIG. 5B, in the manner heretofore described. Accordingly, as theconditioning head 29 is moved horizontally across the surface of thepolishing pad 97 by pivoting action of theconditioning arm 85, in conventional fashion, therotating conditioning disk 36 scores and shears the surface of thepolishing pad 97 to condition thepolishing pad 97 in conventional fashion. It will be appreciated by those skilled in the art that thefluid source 95 and fluid-actuatedcylinder 44 are capable of applying theconditioning disk 36 against thepolishing pad 97 at a steady pressure throughout the conditioning operation. - To terminate the conditioning operation, the
rotating conditioning disk 36 is removed from contact with thepolishing pad 97 by operating the fluid-actuatedcylinder 44 to raise thepiston 48 in thehousing 45 and thus, raise thetravel hub 32 anddisk shaft 33 in theconditioning head 29 and remove theconditioning disk 36 from contact with thepolishing pad 97. It will be appreciated by those skilled in the art that thepositioning monitor 92, in conjunction with theposition sensor 88 on thestationary travel housing 31 and themagnetic ring 90 on thetravel hub 32, provide a reliable indicator to operating personnel of the relative position of theconditioning disk 36 with respect to thepolishing pad 97 throughout the conditioning operation. - Referring next to FIG. 8, a schematic is shown illustrating a typical pneumatic control valve system in triplicate for each of three conditioning disk actuating systems of the present invention, located at three respective chemical mechanical polishers (not illustrated) in a semiconductor fabrication facility. In the embodiment of the present invention wherein the
fluid source 95 is a source of clean, dry air (CDA), theCDA source 95 is pneumatically connected to each of three “up”control valves 4 typically through each of threeneedle valves 2 that can be used to control the upward speed of each travel hub in the corresponding travel housing. Each “up”control valve 4 facilitates flow of CDA into the fluid-actuatedcylinder 44 through the bottom fluid hose 47 (FIGS. 5A and 5B) thereof to facilitate raising thetravel hub 32 anddisk shaft 33 in eachconditioning head 29. A “down”control valve 6 facilitates flow of CDA into the fluid-actuatedcylinder 44 through the topfluid hose 46 thereof to facilitate lowering thetravel hub 32 anddisk shaft 33 in eachconditioning head 29 and pressing theconditioning disk 36 against thepolishing pad 97. Typically, the “down”control valves 6 are components of the conventional diaphragm-actuated control system (such as the SCM Venturi air/vacuum system) having theconditioning head 52 heretofore described with respect to FIGS. 2-4. Accordingly, the fluid-actuatedcylinders 44 and the “up”control valves 4 of the present invention may be retrofitted to the “down”control valves 6 as part of the conventional diaphragm-actuated control system. It is understood that the schematic of FIG. 8 represents only one example of a pneumatic valve control system which is suitable for controlling the conditioning disk actuating system of the present invention. - Referring next to FIG. 9, another embodiment of the
pad conditioning head 101 includes ahousing 103 which is typically mounted on ahead support arm 130. Acylindrical core wall 104 is mounted inside thehousing 103, and acylindrical piston 107 is vertically slidably mounted between the inner surface of thehousing 103 and the outer surface of thecore wall 104. Anupper air cavity 108 is defined above thepiston 107, and alower air cavity 111 is defined beneath thepiston 107. At least one uppercavity air opening 128 communicates with theupper air cavity 108 for the introduction of air into theupper air cavity 108 and moving thepiston 107 downwardly in thehousing 103. Similarly, at least one lower cavity air opening (not shown) communicates with thelower air cavity 111 for the introduction of air into thelower air cavity 111 and moving thepiston 107 upwardly in thehousing 103. An outside O-ring 110 is interposed between thepiston 107 and thehousing 103. Amagnetic ring 109 encircles thepiston 107 and is disposed in contact with the inner surface of thehousing 103. A position-sensingproximity switch 112 is provided in thehousing 103, in magnetic contact with themagnetic ring 109, for sensing the vertical position of thepiston 107 in thehousing 103, as hereinafter further described. An inside O-ring 113 is typically interposed between the inner surface of thepiston 107 and the outer surface of thecore wall 104. - A
cylindrical hub 115 having a central hub bore 116 is mounted inside thecore wall 104, with aball bearing 118 and a needle bearing 121 typically interposed between the outer surface of thehub 115 from the inner surface of thecore wall 104. Abelt gear 117, which receives adrive belt 123 engaged by a driving mechanism (not shown), is mounted on the upper end of thehub 115. Ashaft 120 extends downwardly through the hub bore 116, and acylindrical bearing 119 is interposed between theshaft 120 and thehub 115. Atravel housing 122 is mounted on the bottom end of theshaft 120. Aconditioning disk holder 125 is attached to thetravel housing 122 for supporting aconditioning disk 126 on thepad conditioning head 101. Theconditioning disk 126 typically threads into theconditioning disk holder 125, in conventional fashion. Atravel housing bearing 124 is interposed between thepiston 107 and thetravel housing 122. - In operation of the
pad conditioning head 101, theconditioning disk 126 is typically threadably attached to theconditioning disk holder 125 preparatory to conditioning aCMP pad 132. Rotation is transmitted from thebelt gear 117 to theconditioning disk 126 through thehub 115, thecylindrical bearing 119, theshaft 120, thetravel housing 122 and theconditioning disk holder 125, respectively. Upon introduction of pressurized air into theupper air cavity 108, thepiston 107 slides downwardly in thehousing 103 and pushes thetravel housing bearing 124, thetravel housing 122, theconditioning disk holder 125 and theconditioning disk 126 downwardly, such that theconditioning disk 126 is simultaneously rotated and pressed against theCMP pad 132 to be conditioned. Pressure of theconditioning disk 126 against theCMP pad 132 may be decreased or terminated by introducing pressurized air into thelower air cavity 111, such that thepiston 107 moves upwardly in thehousing 103 and raises theconditioning disk 126 through thehousing bearing 124, thetravel housing 122 and theconditioning disk holder 125. Theproximity switch 112 continually senses the position of themagnetic ring 109 on thepiston 107 and feeds this information back to atimer control box 134, as shown in FIG. 10, to vary the pressure exerted against theCMP pad 132 by theconditioning disk 126 as a function of time according to the conditioning needs of theCMP pad 132. - While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications can be made in the invention and the appended claims are intended to cover all such modifications which may fall within the spirit and scope of the invention.
Claims (27)
1. A system comprising:
a conditioning head;
a travel hub vertically movably mounted in said conditioning head;
a disk shaft carried by said travel hub;
a conditioning disk carried by said disk shaft;
a fluid-actuated cylinder operably engaging said travel hub for selectively moving said travel hub between upper and lower positions in said conditioning head; and
a fluid source connected to said fluid-actuated cylinder for flowing a fluid to and from said fluid-actuated cylinder.
2. The system of claim 1 further comprising a position sensing mechanism operably engaging said travel hub for sensing a position of said travel hub in said conditioning head.
3. The system of claim 1 wherein said fluid-actuated cylinder comprises a pneumatic cylinder.
4. The system of claim 3 further comprising a position sensing mechanism operably engaging said travel hub for sensing a position of said travel hub in said conditioning head.
5. The system of claim 1 further comprising a travel housing provided in said conditioning head and wherein said travel hub is vertically movably mounted in said travel housing.
6. The system of claim 5 further comprising a position sensing mechanism operably engaging said travel hub for sensing a position of said travel hub in said conditioning head.
7. The system of claim 5 wherein said fluid-actuated cylinder comprises a pneumatic cylinder.
8. The system of claim 7 further comprising a position sensing mechanism operably engaging said travel hub for sensing a position of said travel hub in said conditioning head.
9. The system of claim 2 wherein said position sensing mechanism comprises a magnetic ring carried by said travel hub, a position sensor provided in said conditioning head in adjacent contact with said magnetic ring, and a positioning monitor operably connected to said position sensor.
10. The system of claim 9 wherein said fluid-actuated cylinder comprises a pneumatic cylinder.
11. The system of claim 9 further comprising a travel housing provided in said conditioning head and wherein said travel hub is vertically movably mounted in said travel housing and said position sensor is provided on said travel housing.
12. The system of claim 3 further comprising a needle valve interposed between said fluid source and said fluid actuated cylinder for controlling a speed of movement of said fluid actuated cylinder from said lower position to said upper position.
13. A system comprising:
a conditioning head;
a travel hub vertically movably mounted in said conditioning head;
a disk shaft carried by said travel hub;
a conditioning disk carried by said disk shaft;
a link carried by said travel hub;
a fluid-actuated cylinder engaging said link for selectively moving said travel hub between upper and lower positions in said conditioning head; and
a fluid source connected to said fluid-actuated cylinder for flowing a fluid to and from said fluid-actuated cylinder.
14. The system of claim 12 further comprising a position sensing mechanism operably engaging said travel hub for sensing a position of said travel hub in said conditioning head.
15. The system of claim 12 further comprising a travel housing provided in said conditioning head and wherein said travel hub is vertically movably mounted in said travel housing.
16. The system of claim 14 wherein said position sensing mechanism comprises a magnetic ring carried by said travel hub, a position sensor provided in said conditioning head in adjacent contact with said magnetic ring, and a positioning monitor operably connected to said position sensor.
17. A system comprising:
a conditioning head;
a travel hub vertically movably mounted in said conditioning head;
a disk shaft carried by said travel hub;
a conditioning disk carried by said disk shaft;
a link having a vertical segment carried by said travel hub and a horizontal segment extending from said vertical segment;
a fluid-actuated cylinder engaging said horizontal segment of said link for selectively moving said travel hub between upper and lower positions in said conditioning head; and
a fluid source connected to said fluid-actuated cylinder for flowing a fluid to and from said fluid-actuated cylinder.
18. The system of claim 17 wherein said fluid-actuated cylinder comprises a pneumatic cylinder.
19. The system of claim 17 further comprising a position sensing mechanism operably engaging said travel hub for sensing a position of said travel hub in said conditioning head.
20. The system of claim 19 wherein said position sensing mechanism comprises a magnetic ring carried by said travel hub, a position sensor provided in said conditioning head in adjacent contact with said magnetic ring, and a positioning monitor operably connected to said position sensor.
21. A system for conditioning a CMP pad, comprising:
a housing;
a piston vertically slidably carried by said housing;
a piston actuating mechanism operably engaging said piston for moving said piston vertically in said housing;
a travel housing engaging said piston for vertical movement with said piston;
a conditioning disk carried by said travel housing; and
a drive mechanism operably engaging said travel housing for rotating said conditioning disk against the CMP pad.
22. The system of claim 21 further comprising a magnetic ring carried by said piston and a proximity switch carried by said housing in magnetic contact with said magnetic ring for monitoring a position of said piston in said housing.
23. The system of claim 21 wherein said piston actuating mechanism comprises an upper air cavity provided in said housing above said piston for receiving pressurized air and driving said piston downwardly in said housing and a lower air cavity provided in said housing below said piston for receiving pressurized air and driving said piston upwardly in said housing.
24. The system of claim 21 wherein said drive mechanism comprises a belt gear operably engaging said travel housing for rotating said travel housing and a drive belt engaging said belt gear for rotating said belt gear.
25. The system of claim 21 further comprising a hub provided in said housing and operably engaged by said drive mechanism and engaging said travel housing for rotating said travel housing responsive to operation of said drive mechanism.
26. The system of claim 21 further comprising a travel housing bearing disposed between said piston and said travel housing.
27. The system of claim 21 further comprising a timer control mechanism operably connected to said piston actuating mechanism for timing vertical movement of said piston in said housing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/301,197 US20030220051A1 (en) | 2002-05-21 | 2002-11-20 | Conditioning disk actuating system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/152,470 US20030220049A1 (en) | 2002-05-21 | 2002-05-21 | Conditioning disk actuating system |
US10/301,197 US20030220051A1 (en) | 2002-05-21 | 2002-11-20 | Conditioning disk actuating system |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/152,470 Continuation-In-Part US20030220049A1 (en) | 2002-05-21 | 2002-05-21 | Conditioning disk actuating system |
Publications (1)
Publication Number | Publication Date |
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US20030220051A1 true US20030220051A1 (en) | 2003-11-27 |
Family
ID=46281577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/301,197 Abandoned US20030220051A1 (en) | 2002-05-21 | 2002-11-20 | Conditioning disk actuating system |
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US (1) | US20030220051A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115070585A (en) * | 2022-07-26 | 2022-09-20 | 湖南天盛新材料科技有限公司 | Magnetic ring cleaning and grinding device |
US20230364731A1 (en) * | 2021-01-27 | 2023-11-16 | Taiwan Semiconductor Manufacturing Company Limited | Chemical mechanical polishing apparatus using a magnetically coupled pad conditioning disk |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5643067A (en) * | 1994-12-16 | 1997-07-01 | Ebara Corporation | Dressing apparatus and method |
US5904615A (en) * | 1997-07-18 | 1999-05-18 | Hankook Machine Tools Co., Ltd. | Pad conditioner for chemical mechanical polishing apparatus |
US5951368A (en) * | 1996-05-29 | 1999-09-14 | Ebara Corporation | Polishing apparatus |
US6178580B1 (en) * | 1998-04-28 | 2001-01-30 | Tokyo Electron Limited | Processing apparatus |
US6322434B1 (en) * | 1999-03-11 | 2001-11-27 | Ebara Corporation | Polishing apparatus including attitude controller for dressing apparatus |
-
2002
- 2002-11-20 US US10/301,197 patent/US20030220051A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5643067A (en) * | 1994-12-16 | 1997-07-01 | Ebara Corporation | Dressing apparatus and method |
US5951368A (en) * | 1996-05-29 | 1999-09-14 | Ebara Corporation | Polishing apparatus |
US5904615A (en) * | 1997-07-18 | 1999-05-18 | Hankook Machine Tools Co., Ltd. | Pad conditioner for chemical mechanical polishing apparatus |
US6178580B1 (en) * | 1998-04-28 | 2001-01-30 | Tokyo Electron Limited | Processing apparatus |
US6322434B1 (en) * | 1999-03-11 | 2001-11-27 | Ebara Corporation | Polishing apparatus including attitude controller for dressing apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230364731A1 (en) * | 2021-01-27 | 2023-11-16 | Taiwan Semiconductor Manufacturing Company Limited | Chemical mechanical polishing apparatus using a magnetically coupled pad conditioning disk |
CN115070585A (en) * | 2022-07-26 | 2022-09-20 | 湖南天盛新材料科技有限公司 | Magnetic ring cleaning and grinding device |
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