CN1014751B - 信息记录盘制造工艺 - Google Patents

信息记录盘制造工艺

Info

Publication number
CN1014751B
CN1014751B CN88106033A CN88106033A CN1014751B CN 1014751 B CN1014751 B CN 1014751B CN 88106033 A CN88106033 A CN 88106033A CN 88106033 A CN88106033 A CN 88106033A CN 1014751 B CN1014751 B CN 1014751B
Authority
CN
China
Prior art keywords
periphery
anvil
dish
angle
distance piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CN88106033A
Other languages
English (en)
Other versions
CN1031291A (zh
Inventor
藤堂昭
木村敏男
栗栖正吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Petrochemical Industries Ltd
Original Assignee
Mitsui Petrochemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Petrochemical Industries Ltd filed Critical Mitsui Petrochemical Industries Ltd
Publication of CN1031291A publication Critical patent/CN1031291A/zh
Publication of CN1014751B publication Critical patent/CN1014751B/zh
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7808—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots
    • B29C65/7811—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots for centring purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
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    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30221—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being point-like
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    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3024—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being non-integral with the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B29C66/452—Joining of substantially the whole surface of the articles the article having a disc form, e.g. making CDs or DVDs
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

一种通过在两盘基片之间的外周和内周间隔件用超声波将其中至少有一个含有记录媒质层的两盘基片焊在一起的方法制造一空气夹层结构的信息记录盘的工艺，其特征在于利用角和砧进行超声波焊接，该角和砧设计成角和砧在它对应于外周间隔件的部分和它对应于内周间隔件的部分之间沿轴向在高度有一差值，其中上述角和砧在高度上差值之和等于上述两盘基片的外周部分加上外周间隔件以及上述两盘基片的内周部分加上内周间隔件之间在厚度上的差值。

Description

本发明涉及用超声波焊接制造空气夹心结构的、例如可用作光盘之类的信息记录盘的工艺。
已经提出了一种由塑料制成的、用诸如激光束以及诸如此类的会聚光线，会聚在含有记录媒质层上进行信息存贮和读出的空气夹心结构的信息记录盘的制造工艺，该工艺包含将盘的两个基片通过放在两基片之间的外周和内周间隔件进行超声波焊接（如日本专利特开昭1035371/1985）。
所提出的工艺是用来将两片盘的基片制成叠片，在这两基片之间置放着外周和内周间隔件，间隔件的两个表面上都有许多突起部分，从超声波焊接机中发出的超声波振动通过所述盘的两个基片加到上述外周和内周间隔上，上述外周和内周间隔件的突起部分被软化，从而将上述间隔件熔化焊接到上述盘的基片上，和粘结叠层方法相比，这工艺的优点在于工艺简单，生产率（产量）较高。
然而在上面提到的已有技术的工艺中，所用的超声波焊接机，在进行超声波焊接的外周和内周间隔件的位置处，角和砧之间所留的空间距离是相等的，而盘基片内周和外周部分的厚度是不同的，一般是盘基片内周部分比盘基片的外周部分厚，而且，内周和外周间隔件的厚度也是不同的。因此，涉及到这样的问题：当其间置有外周和内周间隔件的两个盘基片用相等空间距离的角和砧通过超声波焊接在一起时，在其片表面上就产生翘曲，因而得不到符合标准规格（按ISO在5毫拉德之间）的翘曲角的信息记录盘，焊接部分容易剥落。
本发明要解决上述问题，本发明的目的是提供一信息记录盘的 制造工艺，不仅所述工艺能够制造一种迭层信息记录盘，即使盘基片及内周和外周间隔件厚度不均匀，该迭层盘也具有良好的翘曲特性且不易剥落。
本发明是一种用超声波焊接手段将其中至少有一个基片含有记录媒质层的两片盘基片通过放在基片间的内周和外周间隔件焊在一起形成具有空气夹心结构的信息记录盘的制造工艺，该工艺特征在于用一种角和砧进行超声波焊接，该角和砧设计成角和砧在它对应于外周间隔件的部分和它对应于内周间隔件的部分之间沿轴线方向的高度是不同的，其中上述角和砧在高度上的差之和等于上述两片盘基片的外周部分加上外周间隔件和上述两片盘基片的内周部分加上内周间隔件之间在厚度上的差。
图1是本发明的信息记录盘的平面图;
图2是在图1中所示的盘在A-A处的截面图;
图3至图5是分别表示外周间隔件的平面图;
图6至图8是分别表示内周间隔件的平面图;
图9是在图3至图8中所示的间隔件在B-B处的截面图;
图10和图11表示一盘基片和外周间隔件以及两片盘基片和内周及外周间隔件焊接在一起时的位置和状态的截面图;
在上述图中，相同标号代表相同或相应的部分，其中1是信息记录盘，3a和3b分别是两片盘基片，4a和4b分别是含记录媒质的层，5是一外周间隔件，6是一内周间隔件，7是一突起部分，8是焊过的部分，11是砧，14是角，11a和14a是外周焊接部分，11b和14b是内周焊接部分。
用于形成盘基片、外周间隔件和内周间隔件的材料是热塑性塑料树脂如聚碳酸脂，有机玻璃（聚甲基异丁烯酸）和聚烯烃。最好所用的树脂是乙烯和用下面化学式〔Ⅰ〕或〔Ⅱ〕表示的环烯烃衍生的环烯烃共聚物。最好的共聚物是含40-85百分比摩尔、最好是含50～80 百分比摩尔的乙烯。用于制成盘基片的最好的树脂，包括如由下列成份构成的环烯烃型无规共聚物组分。
（A）包含一乙烯组份和-环烯烃组份的环烯烃型无规聚合物，该环烯烃由下列一般化学式〔Ⅰ〕或〔Ⅱ〕表示的环烯烃中衍生出来，所述共聚物有在135°的萘烷中和一至少在70°的软化温度（TMA）下测得为0.05-10dl/g的固有粘度（η）;
（B）一环烯烃型无规共聚物，包括一乙烯组份和由下面化学式〔Ⅰ〕或〔Ⅱ〕表示的-环烯烃组份，上述共聚物有在135°的萘烷和一低于70°的软化温（TMA）下测得为0.01-5dl/g的固有粘度（η），上述组份〔A〕组份〔B〕的重量比是100/0.1到100/10。组份〔A〕应包含40-95百分比摩尔，最好是40-80百分比摩尔，更好是50-75百分比摩尔的乙烯，组份〔B〕应包含60-98百分比摩尔，最好是60-95百分比摩尔的乙烯。
Figure 88106033_IMG2
其中，n和m是零或正整数，l是3或更大的整数，R1到R10表示氢原子、卤原子或烃类族。
上面提到的树脂，用于形成盘基片的树脂最好是透明的，用于制成外周间隔件的树脂最好是含有重量0.01-5%无机颗粒如颗粒直径小于200μm的二氧化钛和硅石的树脂。用于制作内周间隔件的树脂可以是透明的或加有填充料的树脂。
所用的盘基片是被模制成透明盘状的盘基片。所用的外周间隔件是被模制成盘状的外周间隔件，所用的内周间隔件是被模制成盘状的间隔件，两个间隔件在其两个表面上都形成突起部分。在这种情况下，沿角和砧的轴线方向在高度上的差由包括突起部分在内的外周间隔件的厚度和包括突起部分在内的内周间隔件的厚度决定。最好突起部分一头逐渐变细，成一尖端，这些突起部分根据需要安排成环状（即沿着圆周方向）但不连续，如图3、4、6和7所示。但它们可以是连续完整的圆，如图5和图8所示。
在本发明中提到的术语“信息记录盘”包括能在包含记录媒质层上记录信息的所有媒质，如光盘及软光盘等。
在制造本发明的信息记录盘的过程中，其间置有内周和外周间隔件的两片盘基片，采用角和砧通过超起波焊在一起，该角和砧设计成在其对应于内周间隔件的部分沿轴线方向在高度上有一差值，其中上述角和砧在高度上的差值之和与上述两片盘其片的外周部分加上外周间隔件及上述两片盘基片的内周部分加上内周间隔件的厚度的差值是相等的。
在上述情况下，较理想的信息记录盘的制作方法是首先将一片盘基片叠在外周间隔件上，用超声波把它们焊在一起，然后，将上述已焊好的外圆周间隔件和基片翻过身来，通过内周间隔件，把另一片盘基片叠上去，接着，通过超声波焊接将两片盘基片从一个方向焊成叠层;将外周间隔片焊在另一盘基片上，将内周间隔件焊在两片盘 基片上。
在本发明的工艺中，因为超声波焊接是用沿轴向高度有预定差值的角和砧来完成的，上述差值对应于盘基片、内周和外周间隔片的厚度，所以在所得到的信息记录盘中残余的变形大大减少，不会发生被焊接部分的剥落，因此这样的信息记录盘有良好的翘曲特性。
按照本发明，因为本发明的工艺是用一沿轴向的高度差对应于（等于）两片盘基片的外周和内周部分加上内周和外周间隔件之间厚度的差值的角和砧来完成两片盘基片的超声波焊接的，所以它可能制造出具有良好翘曲特性的迭层的信息记录盘。
下面结合以附图中的图表示的例子来对本发明进行描述。图1是制造的信息记录盘的平面图，图2是在图1表示的盘在A-A处的截面图，图3至图5分别表示外周间隔件的平面图，图6至图8分别是内周间隔件的平面图，图9分别是在图3至图8中表示的间隔件在B-B处的截面图，图10和图11是表示盘基片和外周间隔件以及盘基片和内周和外周间隔件焊接在一起时的状态的截面图。
在图1和图2中，1是一包含一在其中心有一中心孔2的空气夹层结构的迭层圆盘的信息记录盘。在盘1中，两片盘基片3a和3b通过一外周间隔件5和一内周间隔件6形成迭层盘，使上述两片盘基片3a和3b的含记录媒质层4a和4b彼此面面相对，上述两片盘基片通过在上述外周和内周间隔件5和6的两表面上的突起部分7通过超声波焊在一起，并通过由上述突起部分7的变化形成的焊接部分8将两片盘基片互相熔化焊接。
外周间隔件5被模制成环形，并在它的两面和相同位置处有锥形突起部分7。突起部分7被安排成环形但不连续，在图3中，它们被安排成短弧，该短弧被排成不连续（断线）的圆，在图4中，它们被模制成长弧，该长弧被安排成一个圆，但沿圆周分成四部分，在图5中它们被模制成一个整圆。
内周间隔件6模制成在其中心处有一中心孔2的圆盘，并在其两表面和在相同位置上有锥形突起部分7，突起部分7被排成环状但不连续，在图6中，它们被模制成锥形并沿两排安排成径向圆点，在图7中，它们被做成短弧，并排成断线的圆状，在图8中，它们被做成整圆。
在图10和11中，11是一超声波焊接机（未在图中示出）的砧（调节台），其中在外周焊接部分11a和内周焊接部分11b之间有一间距△A。在外周焊接部分11a的表面上有一被做成环状且连续的定位槽12，在内周焊接部分11b内有一定位卡具13。连到超声波焊接机（图中未画出）的角14在砧11的正上方，其中外周焊接部分14a和一内周焊接部分14b以类似的方式正针对着砧11形成在其下部，它们之间有间距△H。
盘基片3a和3b的内周部分的厚度比外周部分的厚度大，当上述盘基片通过外周间隔件5和内周间隔件6放在上面时，盘基片的外周和内周部分之间的厚度差正好是间距△A和△H之和。
在制造信息记录盘1的工艺中，如图10所示，当将间隔件5的突起部分7插入超声波焊接机的砧11的定位槽中时，通过定位上述间隔件5将外周间隔件5定位在砧11上。然后，盘基片3a被叠放在间隔器5上，再通过把定位卡具13插入盘基片3a的中心孔2内，将该盘基片3a设置、定位和安装在砧11上。定位卡具13被分成三部分，这些部分设计成沿径向敞开并定位和卡住盘基片3a。
在上述的状态中，连接到超声波振荡器上的角14可以通过液压缸（图中未画出）装置降落到盘基片3a上，并在压力作用下将超声波振动发送到盘基片3a，此时，外周间隔件5的上表面的突起部分7和外周间隔件5的相应部分被软化而将上述间隔件5熔化焊接到盘基片3a，从而形成了焊接部分8如图2和11所示。
其次，如图11所示，将已焊上外周间隔件5的盘基片3a翻转过 来，另一侧的盘基片3b通过内周间隔件6叠在上述盘基片3a上而安置在砧11上。通过将定位卡具13插入中心孔2中使盘基片3a、3b和内周间隔件6定位并固定在砧11上，然后再将角14降到盘基片3b上并在压力作用下将超声波振动传到其上，由此，外周间隔件5的未焊突起部分和盘基片3b的相应部分，内周间隔件6的两侧的突起部分7和盘基片3a和3b的相应部分被软化，焊接在一起而形成焊接部分8如图2所所示，这样信息记录盘1就制成了。
在如上述的工艺中，在得到的迭层信息记录盘1中，残余变形大大减少，翘曲特性良好，也没有迭层出现剥落，这是因为砧11和角14分别有间距△A和△H，结果，当通过被放在其间的外周间隔件5和内周间隔件6把它们放在一起时，外周焊接部分11a和14a与内周焊接部分11b和14b之间高度上的差值和盘基片3a和3b的外周部分与内周部分之间在厚度上的差值相等，而且，在该工艺的第一步中（图10所示），外周间隔器5已被焊接到盘基片3a上，之后，在该工艺的第二步中（图11所示），外周间隔器5和内周间隔器6同时被焊接到另一盘基片3b上，因此在所制得的迭层盘上的残余变形大大减少，所得的信息记录盘在翘曲特性方面有了进一步提高。
下面结合测试例子和测试对照例子的对比对本发明作进一步的描述。
信息记录盘1按照上述工艺采用超声波焊接方法将基片3a和基片3b焊在一起制成。其中盘基片3a及3b的直径为130mm，外周部分厚度为1.18mm，内周部分厚度为1.23mm，上述基片由乙烯/四环十二碳烯共聚物（乙烯含量62百分比摩尔）模制而成，如图3所示的外周间隔件，外直径130mm，内径125mm，厚度约0.77mm，由包含乙烯/四环十二碳烯共聚物的树脂组分（乙烯含量72摩尔百分数），加0.3%（重量）的二氧化钛模制而成，如图6所示的内周间隔件，外径36mm，内径15mm，厚度约0.76mm，由乙烯/四环十二碳烯共聚物 （乙烯含量72摩尔百分数）模制而成，焊接时用砧11和角14，其间距△A和△H的变化如表1所示。对如此制成的信息记录盘1进行了翘曲值的实测，（基片3a的翘曲角最大值加基片3b的翘曲角最大值/2）。制成的信息记录盘从1米的高度落下，然后用肉眼评价焊接部分的情况，所得结果示于表1。
在表1中，实测的翘曲（W）值按照下列平定值表示出来。在这个方面，不影响它们的特性，能实用的信息记录盘是有评定值F和G的信息记录盘：
A：W＞10米弧度
B：10≥W＞8.75米弧度
C：8.75≥W＞7.5米弧度
D：7.5≥W＞6.25米弧度
E：6.25≥W＞5米弧度
F：5≥W＞3.75米弧度
G：W≤3.75米弧度
对照例1和2用和在上述例子中同样的方法进行测量，只是对照例1中的间距△A和△H都为零，对照例2中的间距△A和△H都非常大。所得的结果如表1所示。
表1
实施例和参照实施例
例1    例2    例3    例4    例5    对照例    对照例
1    2
（参照实施例）
高度差    95    80    60    50    20    0    150
角△H（μm）
砧△A（μm）    6    6    60    40    70    0    150
△H+△A    101    86    120    90    90    0    300
（μm）
翘曲值    G    F    G    F    F    B    D
跌    没    同    同    同    同    外    内
有    周    周
落    发    间    间
现    隔    隔
试    翘    件    件
曲    前    前    前    前    翘    翘
验    曲    曲
从表1结果可知，用在高度上的差值等于盘基片外周和内周部分加上内周和外周间隔件之间在厚度上的差值的砧和角进行超声波焊接的实施例，当进行跌落试验时，所得的信息记录盘在翘曲特性上是极好的，并且不发生剥落，而在对照例的工艺中即，砧和角在高度上设有差值，或差值很大，所得的信息记录盘在进行跌落试验后有较大的翘曲值，并易发生剥落。

Claims (3)

1、一种通过在两盘基片之间的外周和内周间隔件用超声波将其中至少有一个含有记录媒质层的两盘基片焊在一起的方法制造一空气夹层结构的信息记录盘的工艺，利用角和砧进行超声波焊接，其特征在于，该角和砧设计成角和砧在它对应于外周间隔件的部分和它对应于内周间隔件的部分之间沿轴向在高度有一差值，其中上述角和砧在高度上差值之和等于上述两盘基片的外周部分加上外周间隔件以及上述两盘基片的内周部分加上内周间隔件之间在厚度上的差值。
2、如权利要求1所述的工艺，其中外周和内周间隔件在其两个表面上都有突起部分。
3、如权利要求2所述的工艺，其中突起部分被安排成环状但不连续。
CN88106033A 1987-08-11 1988-08-11 信息记录盘制造工艺 Expired CN1014751B (zh)

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CN1031291A (zh) 1989-02-22

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