JP2004106131A - Polishing device for hard, brittle sheet - Google Patents

Polishing device for hard, brittle sheet Download PDF

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Publication number
JP2004106131A
JP2004106131A JP2002273666A JP2002273666A JP2004106131A JP 2004106131 A JP2004106131 A JP 2004106131A JP 2002273666 A JP2002273666 A JP 2002273666A JP 2002273666 A JP2002273666 A JP 2002273666A JP 2004106131 A JP2004106131 A JP 2004106131A
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Japan
Prior art keywords
plate
polishing
surface plate
platen
diameter
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JP2002273666A
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Japanese (ja)
Inventor
Kenichi Ishikawa
石川 憲一
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Fujikoshi Machinery Corp
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Fujikoshi Machinery Corp
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Priority to JP2002273666A priority Critical patent/JP2004106131A/en
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  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve wear distance property of a polishing device used for lapping or polishing hard, brittle sheets, such as semiconductor wafers, which is worsened by down-sizing the device that is designed to polish each sheet, by reducing the ratio of the polishing target object to the diameter of the base board and thereby making the device smaller. <P>SOLUTION: In order to improve wear distance property of the device worsened by making the diameter of the base board smaller, the rotary base board for polishing the hard, brittle sheet through sliding movement is divided into an internal base board 4 and an external base board 5, with a round dividing line 3 as the demarcation border, and they are revolved at different angular velocity. In the case of a polishing device structured to sandwich a hard, brittle sheet between an upper lap and a lower lap, each of both upper and lower laps is divided into the internal and external laps 4, 5, with both driven to revolve at different angular velocity. By cutting suitable shapes of grooves into laps, the wear distance property is improved. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
この発明は、半導体ウェハで代表される硬質脆性板表面のラッピングないしポリシングに使用する研磨装置に関するもので、特に加工する硬質脆性板を回転する定盤(研磨定盤)に押接する構造の上記装置に関するものである。
【0002】
【従来の技術】
半導体ウェハの製造工程は、半導体インゴットを切断し、切断されたウェハのクラック層をラッピングにより除去すると共に所定の厚みに揃え、エッチング等による化学的研磨によって加工歪みを除去し、その後、ポリシングにより鏡面加工されウェハが完成する。
【0003】
半導体ウェハの製造工程の一つである平面ラッピングを行う加工装置としては、現在4ウェイラップ盤が主流となっている。4ウェイラップ盤は、工作物の自転、定盤軸を中心とした工作物の遊星運動(公転)、及び上下定盤でそれぞれ反対方向の回転の4方向の動作が加えられるラップ盤である。ラップ盤による加工では、加工量は加工圧力と工作物とラップ定盤間の相対摩耗距離に比例する。よって、加工圧力が一定であれば工作物表面の摩耗距離は均一である方が良い平行平面を得られる。4ウェイラップ盤では、工作物に比して大きなラップ定盤を使うほど、均等に分布した良い摩耗距離特性を得ることができ、より良好な平行平面が得られる。一般的なラップ盤では、工作物径とラップ定盤径の比が4倍程度である。ここで言う摩耗距離特性は、工作物表面のラップ定盤に対する相対摺動距離の均一さの程度を意味し、1に近いほど均一度が高い。
【0004】
【発明が解決しようとする課題】
半導体の生産性を高め製造コストの低減を図るために、半導体ウェハの直径が大きくなっている。4ウェイラップ盤は工作物径に比例して工作機械も大きくなるので、工作物の大口径化に伴ってラップ定盤及びこれを装着する工作機械が巨大化している問題がある。工作機械の大型化によって起こる問題としては、据付面積の増大以外にも、モーターや加工で発生する熱による定盤の熱変形の増大や自重の増大による変形による定盤精度の悪化がある。また、自重の増大によっては定盤の取外しや修正などの作業性を非常に悪化させる原因となる。
【0005】
そこでこの発明は、益々大型化が進むと考えられる研磨盤の省スペース化を図るため、ウェハを一枚ずつ加工する枚葉研磨盤を開発することを目的としている。更に本発明では、工作物を一枚ずつ加工する枚葉ラッピングないし枚葉ポリシングを行う研磨盤において、工作物径と研磨定盤径の比を小さくすると共に、悪化する摩耗距離特性を改善することを課題としている。
【0006】
【課題を解決するための手段】
上記課題を解決した本願請求項1の発明に係る硬質脆性板の研磨装置は、硬質脆性板の面を定盤の研磨面に押接して当該硬質脆性板及び定盤を回転させることにより硬質脆性板をラッピングないしポリシング加工する硬質脆性板の片面ないし両面研磨装置において、円形の分割線3により内定盤4と外定盤5とに分割された研磨面を備え、当該内定盤と外定盤とが異なる角速度で回転駆動されるというものである。
【0007】
硬質脆性板の上下面を上下の定盤の研磨面で挟持して当該硬質脆性板及び定盤を回転させることにより硬質脆性板を両面ラッピングないし両面ポリシング加工する両面研磨装置においては、上下の研磨面のそれぞれを円形の分割線3により内定盤4と外定盤5とに分割し、それぞれの内定盤と外定盤とを異なる角速度で回転駆動するのが好ましい。
【0008】
請求項3の発明は、上記手段を備えた硬質脆性板の研磨装置において、外定盤が内定盤より遅い角速度で同方向に回転駆動されることを特徴とするものである。
【0009】
また、この発明の研磨装置における定盤径(研磨面の径、外定盤の外径と同じ)は、装置寸法及び加工特性の点で、加工する硬質脆性板の径の1.5ないし2倍とするのが適当である。
【0010】
摩耗距離特性の改善のためには、内定盤及び外定盤の研磨面に摩耗距離特性を改善するための円形溝12及び/又は直線溝13を設ける。
【0011】
一般に、研磨装置の小型化を図るために定盤の回転中心と工作物の中心との偏心量を小さくとり、工作物径と定盤径の比(以下、単に「径比」という)を小さく取れば摩耗距離特性は悪化する。この出願の発明は、定盤を小径化することにより悪化する摩耗距離特性の改善を図るため、第1に、硬質脆性板を摺擦する回転定盤を円形の分割線3により内定盤4と外定盤5とに分割し、それらを異なる角速度で回転駆動することにより、上記課題を解決している。硬質脆性板を回転する上下の定盤で挟持する構造の研磨装置においては、上下の定盤のそれぞれが内定盤4と外定盤5に分割され、これらが異なる角速度で回転駆動される。好ましい駆動形態は、上下の定盤をそれぞれ反対方向に回転駆動し、外定盤を内定盤より低速で同方向に駆動するというものである。すなわち、外定盤5に内定盤4よりも小さい角速度を与え工作物外側の摩耗距離を減少させて摩耗距離特性を改善する。
【0012】
径比が1〜2の場合と2以上の場合では、装置の構造が異なってくる。前述したように通常の4ウェイラップ盤では、定盤軸中心に配置される太陽ギヤと定盤の外に配置されるインターナルギヤにより工作物に公転が加えられる。しかし径比を2倍以下としたときには、太陽ギヤが配置できないことから、工作物に公転を加えることは難しい。一方、径比を2倍以下とすることにより、大径の硬質脆性板を加工可能な小型の枚葉ラップ盤が得られる。
【0013】
この発明では、径比を小さくすることにより悪化する摩耗距離特性を改善するために、第2に、定盤の研磨面に溝10、11、12、13を設けている。通常のラップ盤でも加工部への砥粒の進入を促進すると共に工作物の定盤への吸着を避けるために溝加工が施されている。溝部では工作物と定盤の摩擦がないため加工が行われない。ラップ定盤に適当な形状の溝を配置することにより、摩耗距離特性の改善を行うことができる。
【0014】
【発明の実施の形態】
以下、図面を参照してこの発明の実施形態を説明する。図1ないし図3は、この発明の第1実施例を示した図で、図1は定盤面とワークとの関係を示す平面図、図2はワークを保持するキャリアの回転駆動系を示す平面図、図3は摩耗距離特性を示す図である。
【0015】
ワークを研磨する定盤面(研磨面)1は、定盤の回転中心2と同心の円形の分割線3で内定盤4と外定盤5とに分割されている。外定盤5の直径Dは、ワークの直径Wの1.6倍(径比=1.6)である。内定盤4と外定盤5の定盤面は同一平面上にあり、外定盤径404mmに対して分割線の径は260mmである。内定盤4は、中心軸2回りにπ/2rad/sの角速度で回転し、外定盤5は同方向にπ/3rad/sの角速度で回転する。一方、工作物を保持するキャリア6は、三方を歯車7、8、9で保持されており、その1個を駆動することにより、π/4rad/sの角速度で回転駆動されている。
【0016】
内定盤4の定盤面には、半径105mm、114mm、118mm及び122mmの位置に幅1mmの円形溝10が設けられている。更に内定盤4の定盤面には、円周を8等分する位置に内端の半径110mmから外端の半径130mmまでの長さで幅2mmの直線溝11が設けられている。また、外定盤5の定盤面には、半径155mm、170mm、185mm、195mm及び200mmの位置に幅1mmの円形溝12が設けられており、更に円周を8等分する位置に半径150mmから外周端まで長さで幅2mmの直線溝13が設けられている。これらの溝は、内定盤及び外定盤の外周部での摩耗距離を調整するために設けられたものである。
【0017】
上述のような定盤4、5を備えたラップ盤で工作物14を研磨したときの摩耗距離特性を図3に示す。図の横軸は工作物表面の中心からの距離、縦軸は摩耗距離特性で、工作物中心の摩耗距離を1として、工作物の各半径位置において摩耗距離特性がどれだけ偏倚するかを示している。
【0018】
図3に示すように、定盤を分割構造として円形溝10、12と直線溝11、13とを設けることにより、工作物中心と外周との摩耗距離の偏倚が約5%まで低下している。一方、工作物中心からの距離が70mmの付近では分割溝の影響から磨粍距離が工作物中心より約1%減少している。摩耗距離が最大となる点と最小となる点での摩耗距離の差は、約6%まで低下している。
【0019】
内外の定盤の回転方向は正方向である方が、逆向きの回転を与えた場合よりも良い摩耗距離特性を得ることが可能である。また、工作物の自転は正方向の回転で、できるだけ小さい角速度をとるのが良い。
【0020】
図4ないし図6は第2実施例を示す図で、図4は定盤の平面図、図5は工作物を保持するキャリアの駆動機構を示す図、図6は摩耗距離特性を示す図である。この第2実施例は、径比が2.4で3枚のワークを同時に加工することができる研磨装置において定盤を分割構造としたものの例である。
【0021】
図中、3は分割線、4は内定盤、5は外定盤、6はキャリアであり、外定盤の径D=374mm、内定盤4の外径(分割溝の径)d=260mm、工作物14の径w=152mm(6インチ)工作物の偏心量r1=111mmである。この第2実施例の定盤面には、溝は設けていない。内定盤4の角速度はπ/2rad/s、外定盤の角速度はπ/3rad/s、工作物の角速度はπ/4rad/sである。なお、工作物14を保持するキャリア6の回転駆動機構は、図5に示すように、太陽歯車15とインターナルギア16による従来の4ウェイラップ盤と同様な構造のものであるが、キャリア6の公転は行っていない。
【0022】
上記構造の装置における摩耗距離特性を図6に示す。定盤を分割構造にすることにより、摩耗距離の最大値と最小値との偏倚が約1.2%と大幅に改善されていることが分かる。この第2実施例では、溝を設けてないが、図1に示したような円形溝や直線溝を設けることにより、摩耗距離特性を更に改善することができる。
【0023】
具体的な装置では、図1や図4に示すような分割構造の定盤が上下に配置されて工作物14の上下面を同時に研磨する構造となる。内定盤と外定盤は、内軸と中空の外軸とで個別に支持して駆動する。外定盤5は、旋回軸受で支持することもできる。上下の内定盤と外定盤とは個別駆動とするか、あるいは適当な歯車列を介して一定の速度比で駆動されるようにする。内定盤4と外定盤5の回転速度比は、一旦設定すれば変更する必要がないから、後者の構造とするのが実際的である。
【0024】
【発明の効果】
以上説明したこの発明によれば、定盤径がワーク径の2倍以下の、従って大口径の半導体ウェハのラッピングないしポリシング加工を行うことが可能な小型の研磨装置を得ることができ、工作物の径と定盤の径の比が小さくなることによる摩耗特性の悪化を回避した研磨装置を得ることができるという効果がある。また、工作物の径と定盤の径の比が2倍以上の研磨装置においても摩耗距離特性を改善することができ、従ってより小型の定盤を用いて大口径の半導体ウェハのラッピングないしポリシングを行うことができる研磨装置が得られる。
【図面の簡単な説明】
【図1】第1実施例の定盤の平面図
【図2】第1実施例のキャリアの駆動機構を示す平面図
【図3】第1実施例の摩耗距離特性を示す図
【図4】第2実施例の定盤の平面図
【図5】第2実施例のキャリアの駆動機構を示す平面図
【図6】第2実施例の摩耗距離特性を示す図
【符号の説明】
3 分割線
4 内定盤
5 外定盤
12 円形溝
13 直線溝
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a polishing apparatus used for lapping or polishing the surface of a hard brittle plate typified by a semiconductor wafer, and particularly to the above-mentioned apparatus having a structure in which a hard brittle plate to be processed is pressed against a rotating surface plate (polishing surface plate). It is about.
[0002]
[Prior art]
In the manufacturing process of a semiconductor wafer, a semiconductor ingot is cut, a crack layer of the cut wafer is removed by lapping, the thickness is adjusted to a predetermined thickness, a processing distortion is removed by chemical polishing such as etching, and then a mirror surface is obtained by polishing. It is processed to complete the wafer.
[0003]
As a processing apparatus for performing planar lapping, which is one of the semiconductor wafer manufacturing processes, a 4-way lapping machine is currently the mainstream. The four-way lapping machine is a lapping machine to which operations in four directions, that is, rotation of the workpiece, planetary movement (revolution) of the workpiece about the axis of the platen, and rotation of the upper and lower platens in opposite directions are added. In lapping, the amount of processing is proportional to the processing pressure and the relative wear distance between the workpiece and the lapping plate. Therefore, if the processing pressure is constant, a uniform parallel surface can be obtained if the wear distance on the surface of the workpiece is uniform. In a four-way lapping machine, the larger the lapping surface plate is used compared to the workpiece, the more evenly distributed good wear distance characteristics can be obtained, and a better parallel plane can be obtained. In a general lapping machine, the ratio of the workpiece diameter to the lapping plate diameter is about four times. The wear distance characteristic referred to here means the degree of uniformity of the relative sliding distance of the workpiece surface with respect to the lap surface plate. The closer to 1, the higher the uniformity.
[0004]
[Problems to be solved by the invention]
In order to increase the productivity of semiconductors and reduce the manufacturing cost, the diameter of semiconductor wafers is increasing. Since the machine tool of the 4-way lapping machine increases in proportion to the diameter of the workpiece, there is a problem in that the lapping surface plate and the machine tool to which the lapping table is mounted become enormous as the diameter of the workpiece increases. As a problem caused by the increase in the size of the machine tool, in addition to the increase in the installation area, there is an increase in the thermal deformation of the platen due to heat generated by the motor and the processing, and a deterioration in the platen accuracy due to the deformation due to an increase in its own weight. In addition, the increase in self-weight may greatly deteriorate workability such as removal and correction of the surface plate.
[0005]
Accordingly, an object of the present invention is to develop a single-wafer polishing machine for processing wafers one by one in order to save the space of a polishing machine which is considered to be increasingly larger. Further, in the present invention, in a polishing machine for performing single-wafer lapping or single-wafer polishing for processing a workpiece one by one, the ratio between the workpiece diameter and the polishing platen diameter is reduced, and the abrasion distance characteristics that are deteriorated are improved. Is an issue.
[0006]
[Means for Solving the Problems]
The polishing apparatus for a hard brittle plate according to the first aspect of the present invention, which solves the above-mentioned problems, presses the surface of the hard brittle plate against the polished surface of the surface plate to rotate the hard brittle plate and the surface plate. In a single-sided or double-sided polishing apparatus for hard brittle plates for lapping or polishing a plate, a polishing surface divided into an inner platen 4 and an outer platen 5 by a circular dividing line 3 is provided. Are rotationally driven at different angular velocities.
[0007]
The upper and lower surfaces of the hard brittle plate are sandwiched between the polishing surfaces of the upper and lower surface plates, and the hard brittle plate and the surface plate are rotated to perform double-side lapping or double-side polishing of the hard brittle plate. It is preferable that each of the surfaces is divided into an inner surface plate 4 and an outer surface plate 5 by a circular dividing line 3, and the inner surface plate and the outer surface plate are driven to rotate at different angular velocities.
[0008]
According to a third aspect of the present invention, in the polishing apparatus for a hard and brittle plate provided with the above means, the outer platen is driven to rotate in the same direction at a lower angular velocity than the inner platen.
[0009]
The diameter of the surface plate (the same as the diameter of the polished surface and the outer diameter of the outer surface plate) in the polishing apparatus of the present invention is 1.5 to 2 times the diameter of the hard brittle plate to be processed in terms of the apparatus dimensions and processing characteristics. It is appropriate to double.
[0010]
In order to improve the wear distance characteristics, a circular groove 12 and / or a straight groove 13 for improving the wear distance characteristics are provided on the polished surfaces of the inner surface plate and the outer surface plate.
[0011]
Generally, in order to reduce the size of the polishing apparatus, the amount of eccentricity between the center of rotation of the surface plate and the center of the workpiece is reduced, and the ratio between the workpiece diameter and the surface plate diameter (hereinafter, simply referred to as “diameter ratio”) is reduced. If it is taken, the wear distance characteristics deteriorate. According to the invention of this application, in order to improve the wear distance characteristic which is deteriorated by reducing the diameter of the surface plate, first, the rotating surface plate rubbing the hard brittle plate is separated from the inner surface plate 4 by a circular dividing line 3. The above problem is solved by dividing into the outer surface plate 5 and rotating them at different angular velocities. In a polishing apparatus having a structure in which a hard and brittle plate is sandwiched between upper and lower rotating surfaces, each of the upper and lower surfaces is divided into an inner surface plate 4 and an outer surface plate 5, and these are rotated at different angular velocities. In a preferred driving mode, the upper and lower platens are driven to rotate in opposite directions, and the outer platen is driven in the same direction at a lower speed than the inner platen. In other words, the outer platen 5 is given a lower angular velocity than the inner platen 4 to reduce the wear distance on the outside of the workpiece, thereby improving the wear distance characteristics.
[0012]
The structure of the apparatus differs between the case where the diameter ratio is 1 and 2 and the case where the diameter ratio is 2 or more. As described above, in a normal four-way lapping machine, a revolving work is applied to a workpiece by a sun gear arranged at the center of a surface plate shaft and an internal gear arranged outside the surface plate. However, when the diameter ratio is less than twice, it is difficult to revolve the workpiece because the sun gear cannot be arranged. On the other hand, by setting the diameter ratio to twice or less, a small-sized sheet-fed lapping machine capable of processing a large-diameter hard brittle plate can be obtained.
[0013]
In the present invention, second, grooves 10, 11, 12, and 13 are provided on the polished surface of the platen in order to improve wear distance characteristics that are deteriorated by reducing the diameter ratio. Even in a normal lapping machine, grooves are formed in order to promote the entry of the abrasive grains into the processing portion and to prevent the workpiece from being attracted to the surface plate. Processing is not performed in the groove because there is no friction between the workpiece and the surface plate. By arranging grooves of an appropriate shape on the lap platen, the wear distance characteristics can be improved.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a plan view showing a relationship between a surface of a platen and a work, and FIG. 2 is a plan view showing a rotary drive system of a carrier holding the work. FIG. 3 and FIG. 3 are diagrams showing wear distance characteristics.
[0015]
A platen surface (polishing surface) 1 for polishing a work is divided into an inner platen 4 and an outer platen 5 by a circular dividing line 3 concentric with a rotation center 2 of the platen. The diameter D of the outer surface plate 5 is 1.6 times the diameter W of the work (diameter ratio = 1.6). The platen surfaces of the inner platen 4 and the outer platen 5 are on the same plane, and the diameter of the dividing line is 260 mm for the outer platen diameter of 404 mm. The inner platen 4 rotates around the central axis 2 at an angular velocity of π / 2 rad / s, and the outer platen 5 rotates in the same direction at an angular velocity of π / 3 rad / s. On the other hand, the carrier 6 for holding the workpiece is held in three directions by gears 7, 8, and 9, and one of them is driven to rotate at an angular velocity of π / 4 rad / s.
[0016]
A circular groove 10 having a width of 1 mm is provided on the surface of the surface of the inner surface plate 4 at radii of 105 mm, 114 mm, 118 mm and 122 mm. Further, on the surface of the surface plate of the inner surface plate 4, a straight groove 11 having a length of 110 mm at the inner end and 130 mm at the outer end and having a width of 2 mm is provided at a position dividing the circumference into eight equal parts. In addition, a circular groove 12 having a width of 1 mm is provided at a position of a radius of 155 mm, 170 mm, 185 mm, 195 mm, and 200 mm on a surface of the surface plate 5 of the outer surface plate 5. A straight groove 13 having a length of 2 mm and a length up to the outer peripheral end is provided. These grooves are provided for adjusting the wear distance on the outer peripheral portions of the inner surface plate and the outer surface plate.
[0017]
FIG. 3 shows the wear distance characteristics when the workpiece 14 is polished by the lapping machine having the above-described lapping plates 4 and 5. The horizontal axis in the figure is the distance from the center of the workpiece surface, and the vertical axis is the wear distance characteristic, where the wear distance at the center of the workpiece is 1, and how much the wear distance characteristic deviates at each radial position of the workpiece. ing.
[0018]
As shown in FIG. 3, the deviation of the wear distance between the center of the workpiece and the outer periphery is reduced to about 5% by providing the circular grooves 10, 12 and the linear grooves 11, 13 with the base plate as a divided structure. . On the other hand, when the distance from the center of the workpiece is around 70 mm, the abrasion distance is reduced by about 1% from the center of the workpiece due to the influence of the dividing groove. The difference between the wear distance at the point where the wear distance is maximum and the point where the wear distance is minimum is reduced to about 6%.
[0019]
It is possible to obtain better wear distance characteristics when the rotation direction of the inner and outer platens is in the forward direction than when the rotation direction is reversed. It is preferable that the rotation of the workpiece is a forward rotation and the angular velocity is as small as possible.
[0020]
4 to 6 are views showing a second embodiment, FIG. 4 is a plan view of a surface plate, FIG. 5 is a view showing a drive mechanism of a carrier for holding a workpiece, and FIG. 6 is a view showing wear distance characteristics. is there. The second embodiment is an example of a polishing apparatus having a diameter ratio of 2.4 and capable of processing three workpieces at the same time, with a platen having a divided structure.
[0021]
In the figure, 3 is a dividing line, 4 is an inner surface plate, 5 is an outer surface plate, and 6 is a carrier. The diameter D of the outer surface plate is 374 mm, the outer diameter of the inner surface plate 4 (diameter of the dividing groove) d = 260 mm, The diameter w of the workpiece 14 is 152 mm (6 inches), and the eccentricity r1 of the workpiece is 111 mm. No groove is provided on the surface of the surface plate of the second embodiment. The angular velocity of the inner platen 4 is π / 2 rad / s, the angular velocity of the outer platen is π / 3 rad / s, and the angular velocity of the workpiece is π / 4 rad / s. As shown in FIG. 5, the rotary drive mechanism of the carrier 6 for holding the workpiece 14 has a structure similar to that of a conventional four-way lapping machine including a sun gear 15 and an internal gear 16. No orbit has been made.
[0022]
FIG. 6 shows the wear distance characteristics of the device having the above structure. It can be seen that the deviation between the maximum value and the minimum value of the wear distance is greatly improved to about 1.2% by using the platen with the divided structure. In this second embodiment, no groove is provided, but by providing a circular groove or a linear groove as shown in FIG. 1, the wear distance characteristics can be further improved.
[0023]
In a specific apparatus, a platen having a divided structure as shown in FIGS. 1 and 4 is arranged vertically so that the upper and lower surfaces of the workpiece 14 are simultaneously polished. The inner platen and the outer platen are individually supported and driven by the inner shaft and the hollow outer shaft. The outer stool 5 can be supported by a slewing bearing. The upper and lower inner and outer stools are individually driven or driven at a constant speed ratio via an appropriate gear train. Since the rotational speed ratio between the inner surface plate 4 and the outer surface plate 5 does not need to be changed once it is set, it is practical to adopt the latter structure.
[0024]
【The invention's effect】
According to the present invention described above, it is possible to obtain a small-sized polishing apparatus capable of performing lapping or polishing of a semiconductor wafer having a platen diameter of not more than twice the diameter of a workpiece, and hence a large-diameter semiconductor wafer. There is an effect that it is possible to obtain a polishing apparatus that avoids deterioration of wear characteristics due to a decrease in the ratio of the diameter of the base to the diameter of the surface plate. Further, the wear distance characteristics can be improved even in a polishing apparatus in which the ratio of the diameter of the workpiece to the diameter of the surface plate is twice or more, and therefore, lapping or polishing of a large-diameter semiconductor wafer using a smaller surface plate. Is obtained.
[Brief description of the drawings]
FIG. 1 is a plan view of a surface plate of a first embodiment; FIG. 2 is a plan view of a carrier driving mechanism of the first embodiment; FIG. 3 is a view showing wear distance characteristics of the first embodiment; FIG. 5 is a plan view showing a carrier driving mechanism of the second embodiment. FIG. 6 is a view showing wear distance characteristics of the second embodiment.
3 dividing line 4 inner surface plate 5 outer surface plate 12 circular groove 13 straight groove

Claims (5)

硬質脆性板の面を定盤の研磨面に押接して当該硬質脆性板及び定盤を回転させることにより硬質脆性板をラッピングないしポリシング加工する硬質脆性板の研磨装置において、研磨面が円形の分割線(3)により分割された内定盤(4)と外定盤(5)とで形成され、当該内定盤と外定盤とが異なる角速度で回転駆動される、硬質脆性板の研磨装置。In a polishing apparatus for a hard brittle plate, which laps or polishes the hard brittle plate by pressing the surface of the hard brittle plate against the polished surface of the platen and rotating the hard brittle plate and the platen, the polished surface has a circular division. A polishing apparatus for a hard brittle plate, comprising an inner surface plate (4) and an outer surface plate (5) divided by a line (3), wherein the inner surface plate and the outer surface plate are driven to rotate at different angular velocities. 硬質脆性板の上下面を上下の定盤の研磨面で挟持して当該硬質脆性板及び定盤を回転させることにより硬質脆性板をラッピングないしポリシング加工する硬質脆性板の研磨装置において、上下の研磨面がそれぞれ円形の分割線(3)により分割された内定盤(4)と外定盤(5)とで形成され、それぞれの内定盤と外定盤とが異なる角速度で回転駆動される、硬質脆性板の研磨装置。The upper and lower surfaces of the hard brittle plate are sandwiched between the polishing surfaces of the upper and lower platens, and the hard brittle plate and the platen are rotated to lap or polish the hard brittle plate. A hard surface, which is formed by an inner surface plate (4) and an outer surface plate (5) each of which is divided by a circular dividing line (3), and the inner surface plate and the outer surface plate are driven to rotate at different angular velocities. Polishing device for brittle plates. 外定盤が内定盤より遅い角速度で同方向に回転駆動される、請求項1又は2記載の硬質脆性板の研磨装置。The polishing apparatus for a hard brittle plate according to claim 1 or 2, wherein the outer platen is driven to rotate in the same direction at a lower angular velocity than the inner platen. 定盤径が加工する硬質脆性板の径の1.5ないし2倍である、請求項1、2又は3記載の硬質脆性板の研磨装置。4. The hard brittle plate polishing apparatus according to claim 1, wherein the platen diameter is 1.5 to 2 times the diameter of the hard brittle plate to be processed. 内定盤及び外定盤の研磨面に摩耗距離特性を改善するための円形溝(12)及び/又は直線溝(13)が設けられている、請求項4記載の硬質脆性板の研磨装置。The polishing device for a hard brittle plate according to claim 4, wherein a circular groove (12) and / or a linear groove (13) for improving wear distance characteristics are provided on the polishing surfaces of the inner surface plate and the outer surface plate.
JP2002273666A 2002-09-19 2002-09-19 Polishing device for hard, brittle sheet Pending JP2004106131A (en)

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