CN102063914A - 光学部件的激光熔覆结构及光拾取装置的制造方法 - Google Patents

光学部件的激光熔覆结构及光拾取装置的制造方法 Download PDF

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CN102063914A
CN102063914A CN2010105419329A CN201010541932A CN102063914A CN 102063914 A CN102063914 A CN 102063914A CN 2010105419329 A CN2010105419329 A CN 2010105419329A CN 201010541932 A CN201010541932 A CN 201010541932A CN 102063914 A CN102063914 A CN 102063914A
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cladding
optics
parts
optical take
laser
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CN102063914B (zh
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荒井聪
古市浩朗
佐竹光雄
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Hitachi Media Electronics Co Ltd
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    • G—PHYSICS
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    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
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    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
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Abstract

本发明提供一种光学部件的激光熔覆结构及光拾取装置的制造方法。在激光熔覆方式中，通过提高熔覆部的界面的密合性而抑制剥离，通过减少光学部件的位置偏离而提高光拾取装置的成品率和可靠性。在光学部件熔覆于保持构件的光拾取装置的制造方法中，包括使光学部件与保持构件接触的工序；通过光学部件，对保持构件的与光学部件相接触的区域照射激光的工序；通过照射使保持构件熔融而熔覆于光学部件的工序；通过在照射激光前，使光学部件的进行熔覆的部分的表面粗糙度比与该部分接触的部分的保持构件的表面粗糙度大，使熔融的保持构件进入到光学部件表面的凹凸，从而提高粘接强度。

Description

光学部件的激光熔覆结构及光拾取装置的制造方法
技术领域
本发明涉及在光盘驱动装置中进行光盘的记录、再生的光拾取装置，还涉及光学部件的固定技术。
背景技术
CD、DVD、Blu-ray碟(全部为注册商标)的用于光盘的记录、再生的光拾取装置为如下构成：通过各种透镜、棱镜、镜子等将来自激光二极管等发光元件的出射光导向物镜，在光盘上使其聚光后，通过物镜及各种透镜、镜子等将来自光盘的返回光用光电二极管受光而变换成光电信号。
在该构成中，虽然各种棱镜等光学部件被配置、固定于拾取盒(pick-upcase)的光路上的规定位置，但是对于光学部件要求亚微米程度的高的固定精度。最常用的固定方法为，通过夹具对光学部件进行定位，在规定的位置涂布紫外线固化型粘接剂，通过照射紫外线而固定的方法。然而，采用紫外线固化型粘接剂的固定，存在由粘接剂的涂布位置、量的误差而导致不能形成理想的形状，易于产生光学部件的长期的位置偏离，易于降低光拾取装置的可靠性这样的问题。此外，为了粘接剂的稳定化和完全固化，必须延长退火时间和紫外线的照射时间，在生产率上也存在问题。
因此，为了提高光学部件的位置稳定性和生产率，作为采用粘接剂的固定方式的取代技术，提出了通过激光将光学部件熔覆于盒体的固定方式。该激光熔覆技术不仅用于光学部件的固定，还用于工业中各种部件的固定。在激光熔覆中，为了确保熔覆面积，一般使用一边扫描激光源或固定夹具，一边在线上或圆上熔覆的方法。通常，光拾取中使用最多的透镜材料为非结晶性树脂中的环烯烃系树脂，光拾取盒中使用最多的树脂为结晶性树脂中的PPS(聚苯硫醚)。以这些树脂的构成来进行激光熔覆时，由于相互的溶解度参数差大，因此相溶性低、确保密合性成为问题。此外，对于PPS树脂而言，由于为了提高刚性而添加玻璃填料，存在线膨胀系数变小的倾向。因此，在激光熔覆时，即从树脂的加热状态急冷时，透镜材料与光拾取盒材料发生对应于非常大的线膨胀系数差的应急反应。其结果是，急冷时在界面的一部分产生剥离的情况多。进一步，在可靠性试验，例如投入于热应力的影响最大的热冲击试验时，确认出来自熔覆部界面的剥离的发生、进行。
因此，为了发挥光学部件的位置稳定性的提高及短节拍生产等激光熔覆的优点，确保熔覆强度、即提高界面的密合性成为必须。
在专利文献1中记载有，通过在非透过树脂侧设置嵌合凸部、在透过树脂侧设置嵌合凹部的状态下，对嵌合凸部的外面整体与包括嵌合凹部的内面整体的面进行激光熔覆，通过结合面使多的激光到达、吸收而提高接合强度。
在专利文献2中记载有，在通过激光熔覆使透镜与壳体接合时，通过在熔覆部分形成微细的凹凸使激光熔覆时透镜与壳体确实地接触，从而在保持确实的接触状态下进行接合的方法。
在专利文献3中记载有，关于微芯片的接合，将芯片基板的流路槽内面以外的表面的粗糙度设为表面形成的SiO2膜的膜厚以上，以形成有流路槽的面为内侧而叠放芯片，通过施加超声波而接合的方法。
在专利文献4中记载有，在进行激光熔覆时，通过在吸收性树脂与透过性树脂相接侧设置由三角形、四角形、梯形构成的突条，进行加压，可以使初期面积增加，减少缝隙，从而可得到没有由空气的卷入而导致空隙等缺陷的牢固的接合面。
在专利文献5中记载有，在光拾取装置中，通过激光熔覆而将光学部件粘接于拾取盒。
现有技术文献
专利文献1：日本特开2005-67208号公报
专利文献2：日本特开2005-339989号公报
专利文献3：日本特开2008-232885号公报
专利文献4：日本特开2008-302700号公报
专利文献5：日本特开2009-116966号公报
发明内容
发明所要解决的课题
在上述专利文献1、4中公开的技术中，如果考虑成型品的尺寸公差，除了可充足加压的部件以外是不可能的，在对如透镜这样的光学部件实施时，由变形导致的象差的发生成为问题。此外，在专利文献4的技术中，由于成型品尺寸公差的影响，在加压时产生偏离，精度良好地形成熔覆部是困难的。
上述专利文献2中公开的技术为，通过微细凹凸的高度比较大、为10～500μm，压碎微细的凹凸而使密合性为良好的方法，其仅在能充分加压的情况下才是有效地。因此，该方法也不能适用于光拾取装置等小型且象差特性严格的光学部件。
在上述专利文献3公开的技术中，微细凹凸的粗糙度比较大、为Ra5～25μm，此外，熔覆方法也为超声波，从变形的观点出发，为不能适用于光学部件。
本发明的目的在于提供一种：通过在作为光学部件的非结晶性树脂的激光熔覆面的至少一部分上形成微细凹凸，与作为拾取盒材料的结晶性树脂相比增大粗糙度的基础上，在微加压状态下实施激光熔覆，抑制熔覆部的剥离并彻底地降低由环境变化导致的光学部件的位置偏离，成品率及可靠性高的光拾取装置及光学部件的激光熔覆结构。
用于解决课题的方案
本发明的特征在于，在光学部件熔覆于保持构件的光拾取装置的制造方法中，包括使光学部件与保持构件接触的工序，通过光学部件对保持构件的与光学部件接触的区域照射激光的工序，通过照射使保持构件熔融而熔覆于光学部件的工序，在激光照射之前，光学部件的进行熔覆的地方的表面粗糙度比部分地接触的地方的保持构件的表面粗糙度大。
此外，本发明的特征在于，在光学部件熔覆于保持构件的光拾取装置中，光学部件与保持构件的熔覆部分，其周边部分的粗糙度比中央部分的粗糙度大。
发明效果
根据本发明，在激光熔覆方式中，通过提高熔覆部的界面的密合性而抑制剥离，通过降低光学部件的位置偏离而提高光拾取装置的成品率和可靠性。
附图说明
图1为显示本发明一实施例涉及的光拾取装置10的光学部件1与拾取盒2的熔覆固定的一个实施例的平面图。
图2为图1的光学部件的从Z方向(拾取的高度方向)观察时的平面图。
图3为以本发明的一个实施例涉及的、由非结晶性树脂构成的光学部件1的突起1c的平坦部的粗糙度为参数时的熔覆强度比较图。
图4为以本发明的一个实施例涉及的、由结晶性树脂构成的拾取盒2的熔覆面2a的粗糙度为参数时的熔覆强度比较图。
图5为显示本发明另外的实施例涉及的光拾取装置10的光学部件1样子的平面图
图6为显示本发明另外的实施例涉及的光学部件的从Z方向观察时的熔覆面的平面图。
图7为显示本发明另外的实施例涉及的光拾取装置10的光学部件1与拾取盒2的熔覆固定的平面图。
图8为显示在本发明的一个实施例涉及的光拾取装置10中，光学部件1与拾取盒2的装配的图。
图9为显示采用本发明一实施例的光拾取装置10的一个例子的外观图。
图10为显示装入了本发明一实施例涉及的光拾取装置10的光盘驱动装置20的一个例子的图。
符号说明
1：光学部件；1a、1b：透镜面；1c：突起部；1d：透镜中心位置；1e：微细的凹凸部；1f：透镜面以外的平坦部；1g：倾斜部；1h：熔覆部的端部；1i：熔覆部的中央部；1-1：检测透镜；1-2：辅助透镜；1-3：物镜；2：拾取盒；3：浇口部；4：激光熔覆部；4a：熔覆的凸缘；10：光拾取装置；11：制动器；12：半透明反射镜；13：棱镜；14：激光二极管；15：光电二极管；16：光拾取用金属壳；20：光盘驱动装置；21：主轴马达；22：驱动器壳。
具体实施方式
以下，使用附图对本发明的实施方式进行说明。图9为显示采用本发明的光拾取装置10的一个例子的外观图。这里，检测透镜1-1、辅助透镜1-2、物镜1-3是作为固定对象的光学部件1，通过激光熔覆固定于拾取盒2。11为制动器部、12为半透明反射镜、13为棱镜、14为激光二极管、15为光电二极管。
图10为显示组装有光拾取装置10的光盘驱动装置20的一个例子的图。16为金属壳、21为主轴马达、22为驱动器壳。
图8为显示在光拾取装置10中、光学部件1与拾取盒2的装配的图，显示光学部件1插入收纳部前后的状态。此时，在激光熔覆中为了确保密合性而必须进行加压，但对光学部件施加大的施加压力时，光学部件的象差成为问题。因此，必须将施加压力设为0.3MPa以下。
在插入前，对于光学部件1而言，例如在Y方向(光轴方向)具有透镜面1a，在X方向上设有与拾取盒2的熔覆用的突起部1c。
对于光学部件1而言，除此以外，例如光栅透镜、耦接镜等也成为激光熔覆的适用对象。这些棱镜为了优先透明性、象差特性，由以环烯烃系树脂、PAMA(甲基丙烯酸甲酯)、芴系聚酯、聚碳酸酯等为材料的非结晶性树脂而构成。另一方面，拾取盒2由PPS(聚苯硫醚)、PBT(聚对苯二甲酸丁二酯)、液晶聚合物等熔点或耐热性高、吸收激光的黑色或灰色构成的结晶性树脂而构成。
这里，由非结晶性树脂构成的光学部件1由于通过成型而被制造，因此必然会残存浇口部3。由此，在浇口部3不构成高度方向上的障碍时，可设置于光拾取装置10的下侧面(Z方向)。另一方面，在高度限制严格时，可设置在与突起部1c同样的光学部件1的侧面侧(X方向)、避开突起部1c的位置。
在插入后，光学部件1与拾取盒2的固定是在加压状态下，相对于光学部件1的突起部1c，从上面方向(Z方向)照射激光，进行熔覆固定。对于激光熔覆的条件而言，在考虑熔覆材料的激光照射波长的透过、吸收率，热传导率和相溶性后，决定激光的束斑大小、功率、照射时间、施加压力。用于激光熔覆的光源从树脂透过率的观点出发，优选包含半导体激光或YAG激光的红外区域的激光。激光光源的强度分布可以通过高斯(Gaussian)、礼帽型(Top-hat)、环型等附属的透镜而成为各种各样的强度分布，出于易于均一地形成熔覆状态这方面考虑，优选使用采用了礼帽型或中央部分的强度为最大值的50％以上的环型的强度分布的光源。
实施例
实施例1
图1为表示本发明的光拾取装置10的光学部件1及拾取盒2的激光熔覆固定的一个实施例的平面图。此次显示的光学部件1在光轴方向(Y轴方向)上具有透镜面1a、1b，在X方向的两端相对于拾取盒面具有突起部1c，突起部1c的拾取盒2的密合面呈形成有微细的凹凸部1e的状态。1d为光轴通过的透镜中心位置。图2为从光学部件1的Z方向观察时的平面图。
相对于拾取盒2激光熔覆光学部件1时，光学部件1通过夹具夹紧或吸住，在突起部1c的平坦面放在拾取盒2的平坦面的状态(加压状态)下，通过突起部1c，一边扫描来自Z方向的激光，一边进行照射。
然而，在如由上述所示的非结晶树脂构成的光学部件1与由结晶性树脂构成的光拾取盒2的组合的情况下，彼此的相溶性低，此外，由于在激光熔覆时、即从树脂的加热状态急冷时，产生对应于非常大的线膨胀系数的应急反应，在界面的一部分产生剥离的情况多。而且，可靠性试验，例如在投入到施加最大热应力的热冲击试验时，也确认出来自熔覆部4界面的剥离的发生、进行。
在激光熔覆中，密合性的确保与该熔覆强度或可靠性有很大关系。因此，通常对相互密合的部分进行镜面加工的情况很多。出于成型的观点，非结晶性树脂比结晶性树脂更可能尺寸精度良好地成型，在进行了镜面加工的情况下，非结晶性树脂与结晶性树脂相比，一般粗糙度变小。
在本实施例中，其特征在于，在作为非结晶性树脂的光学部件1的突起部1c的平坦部形成微细的凹凸1e，比作为结晶性树脂的拾取盒2的熔覆面2a的粗糙度更大。对于这样的使光学部件1的平坦部的微细凹凸1e面的粗糙度增大的方法而言，可使用成型时的起皱(シボ)处理或喷射处理等。此外，光学部件1上形成的微细的凹凸1e的粗糙度需要设为入射的激光的波长以上。在设为与波长同等程度时，该界面产生急剧的光吸收，为不适于激光熔覆的结构。
通过在以上所示的光学部件1的突起部1c的平坦部形成微细的凹凸1e，进行激光熔覆，在激光照射时熔融、软化由结晶性树脂构成的拾取盒2而后进行热膨胀，从而密合于光学部件1的突起部1c的微细的凹凸1e部的界面。其结果是与现有的熔覆相比，锚定效果的影响增加，提高界面的强度。在图3中显示在光学部件1的突起部1c平坦部整体地形成有微细的凹凸1e，以其粗糙度为参数时的熔覆强度的比较结果。图3以与光学部件1的突起部1d的平坦部的粗糙度进行镜面加工(Ra 0.16μm)、拾取盒2的熔覆面2a的粗糙度进行镜面加工(Ra 0.25μm)时的值的相对值来表示，作为光学部件1的材料使用非结晶性树脂中的环烯烃树脂，作为拾取盒2的材料使用结晶性树脂中的PPS。在将作为非结晶性树脂的光学部件1的表面粗糙度Ra设为约1.0～2.0μm时，可知熔覆强度的相对值超过1，与对光学部件进行镜面加工时相比粘接强度提高。此外，在将表面粗糙度Ra设为3.6μm时，与镜面加工的情况相比，粘接强度下降。如此，通过将光学部件1的突起部的1c的平坦部的粗糙度Ra设为比进行镜面加工时大且为3μm以下，在镜面加工的彼此之间比进行激光熔覆时相比，确认出强度的提高。此外，此时作为非结晶性树脂的环烯烃树脂的粗糙度Ra为1.81μm，作为结晶性树脂的PPS的粗糙度Ra为3.46μm时，与镜面加工的彼此相比，确认出强度降低。
另一方面，作为拾取盒2的材料而使用的结晶性树脂PPS的熔覆面2a的粗糙度为参数时的熔覆强度的比较结果示于图4。关于图4，也是以镜面加工的彼此为基准(熔覆强度相对值：1)。可知，随着拾取盒2的熔覆面2a的粗糙度增加，熔覆强度降低。如此可知，即便增大作为结晶性树脂的PPS的粗糙度Ra，也不引起强度提高。这是因为受如下因素影响：特别是对应于入射的激光强度小的部分的熔覆端部地方，仅凭借软化而后热膨胀来进行密合的情况多，在该部分存在粗糙度时，不发生完全的密合。
因此发现：在附加粗糙度而提高密合性时，在非结晶性树脂侧设置由微细的凹凸1e所产生的粗糙度，对结晶性树脂侧进行镜面加工是最有效的手段。
此外，在激光熔覆中，如果考虑熔融、软化而后热膨胀时结晶性树脂被非结晶性树脂润湿，则需要非结晶性树脂的表面自由能量≥结晶性树脂的表面自由能量。尤其是由于光学部件1的材料大量使用了环烯烃系树脂，结构上不具有极性基团，因此表面自由能量非常小，难以润湿结晶性树脂。因此，对于光学部件1的突起部1c，除了形成微细的凹凸1e，优选进行UV臭氧处理、等离子处理、电晕处理中的任一表面改性处理，使光学部件1的熔覆面的表面自由能量提高后，进行激光熔覆。
实施例2
图5为显示本发明的光拾取装置10的光学部件1的另一方式的平面图。如此，相对于突起部1c，在与光轴1d平行的面进行光学部件1的熔覆时也可适用。此外，由于安装光学部件1的面积的关系，不能设置用于激光熔覆的突起部1c时，也可使用确保透镜面以外的平行度的部分1f。
实施例3
图6为在本实施例的光学部件1的突起部1c中，对应于熔覆部的端部地方1h形成微细的凹凸1e，其粗糙度比熔覆部的中心部1i大的光学部件1的平面图。在激光熔覆中，入射的激光的强度分布有高斯、扁平型、环型等各种形状，但是对应于功率或树脂的热传导率，有到激光强度小的端部的地方为止也熔覆的情况。尤其是在激光强度分布中，对于对应于强度大的地方的熔覆部4而言，由于形成拾取盒2的结晶性树脂熔融、流动，密合于光学部件1的非结晶性树脂，因此，即便是在熔覆前的成型时彼此为镜面的场合，熔覆后的激光强度大的部分的熔覆部4也形成凹凸的情况多。另一方面，激光强度小的端部的地方，在软化的状态下密合于非结晶性树脂。因此，在熔覆部4的端部附近形成微细的凹凸1e，增大其粗糙度，熔覆部4的中央附近通过镜面加工等，即便使表面粗糙度降低至比端部附近小，对于提高强度也是有效的手段。
实施例4
图7为显示光拾取装置10的光学部件1与拾取盒2的激光熔覆固定的另外的实施例的结构图。在激光熔覆中，在线上扫描激光时，激光照射的终端部地方易于过熔覆，产生空孔的情况多，此外，由于即便是窄一看熔覆后被正常地熔覆时，端部地方也产生过大的残留应力，因此在可靠性试验时确认出发生从端部地方的剥离。因此，如7所示，在光学部件1的熔覆部4的激光扫描方向的终端部分设置倾斜部1g，形成熔覆的凸缘(fillet)4a，此外通过在对应于凸缘4a部的倾斜部1g也形成微细的凹凸，能够谋求强度提高和应力缓和的并存。此时，虽然也依存于成型精度，但在拾取盒2的熔覆部4端部附近预先设置倾斜，对于凸缘4a的形成也是有效的手段。对于该凸缘4a而言，通过对由结晶性树脂构成的拾取盒2的激光入射而导致的急剧的热膨胀与除气的复合原因来形成。对于微细的凹凸而言，为了与软化的状态的凸缘4a密合，优选增大表面粗糙度至比拾取盒的熔覆面大。此外，在熔覆前使光学部件与拾取盒密合时，倾斜部1g位于没有密合的位置，即便增大凹凸也不会使密合性恶化。因此，也可增大倾斜部的凹凸至比光学部件1的其他的熔覆部分的凹凸、表面粗糙度大。
这里，虽然在光拾取装置的本实施例中为倾斜部，但是只要比激光熔覆面陷入地形成低的凹陷，就可以为倾斜部以外的槽或切口等。这里，优选将光学部件1的突起部1c的斜面1g与拾取盒2的距离设为50μm以下。此外，在图7中，虽然形成凸缘4a的地方仅设为激光扫描方向(激光熔覆部分的长度方向)的终端，但也不一定仅限于激光扫描的终端。
作为实施例，至此以光拾取装置10为例进行了说明，但该结构不仅对光拾取装置10用的光学部件1有效，对手机或数码相机等使用光学部件的制品及使用了光学部件以外的可透过激光的部件的熔覆结构都普遍有效。
工业实用性
近年来在光拾取装置的小型、薄型化的同时，要求对各种规格的光盘媒介的高速记录。在试图以一台光拾取装置满足这些规格的情况下，设计余量变小的同时，对于光学部件的固定要求更进一步的高精度化变得必须。如使用上述的各实施例，与现有的仅采用粘接剂的固定方法相比，能够大幅地降低光学部件的位置偏离，也使生产率飞跃性地提高。此外，通过提高熔覆强度，能够抑制熔覆时或可靠性的剥离，能够充分发挥激光熔覆的优点。因此，本发明非常有助于实现光拾取装置及光盘驱动装置的高可靠性化、低成本化。

Claims (20)

1.一种光拾取装置的制造方法，其特征在于，为具有拾取盒、光元件及光学部件且所述光学部件熔覆于保持构件的光拾取装置的制造方法，包括：
使所述光学部件与所述保持构件接触的工序，
通过所述光学部件，对所述保持构件的与所述光学部件接触的区域照射激光的工序，
通过所述照射使所述保持构件熔融而熔覆于所述光学部件的工序，
在照射所述激光前，所述光学部件的进行熔覆的部分的表面粗糙度比与所述部分接触的部分的保持构件的表面粗糙度大。
2.如权利要求1所述的光拾取装置的制造方法，其特征在于，所述光学部件为透镜，
所述保持构件为所述拾取盒。
3.如权利要求1所述的光拾取装置的制造方法，其特征在于，所述光学部件的表面粗糙度比所述激光的波长大。
4.如权利要求1所述的光拾取装置的制造方法，其特征在于，所述保持构件的表面被镜面加工，
所述光学部件的表面没有被镜面加工。
5.如权利要求1所述的光拾取装置的制造方法，其特征在于，所述光学部件的表面粗糙度为3.0μm以下。
6.如权利要求5所述的光拾取装置的制造方法，其特征在于，所述光学部件的表面粗糙度为1.0～2.0μm。
7.如权利要求1所述的光拾取装置的制造方法，其特征在于，所述光学部件为非结晶性树脂，
所述保持构件为结晶性树脂。
8.如权利要求7所述的光拾取装置的制造方法，其特征在于，以由所述结晶性树脂形成的保持构件的表面自由能量比由所述非结晶性树脂形成的光学部件的表面自由能量小的树脂构成，来进行激光熔覆。
9.如权利要求1所述的光拾取装置的制造方法，其特征在于，在所述熔覆工序前，对所述光学部件的进行熔覆的部分实施UV臭氧处理、等离子处理、电晕处理中的任一种处理。
10.如权利要求1所述的光拾取装置的制造方法，其特征在于，在所述熔覆前，所述光学部件的熔覆部分的中央部的表面粗糙度比其周围的部分小。
11.如权利要求1所述的光拾取装置的制造方法，其特征在于，所述光学部件在其熔覆部分的激光扫描方向的端部，具有与熔覆部分的其他位置相比陷入的部分。
12.一种光拾取装置，其特征在于，为具有拾取盒、光元件及光学部件且所述光学部件熔覆于保持构件的光拾取装置，
所述光学部件与所述保持构件的熔覆部分，其周边部分的粗糙度比中央部分的粗糙度大。
13.如权利要求12所述的光拾取装置，其特征在于，所述光学部件为透镜，
所述保持构件为所述拾取盒。
14.如权利要求12所述的光拾取装置，其特征在于，所述光学部件为非结晶性树脂，
所述保持构件为结晶性树脂。
15.如权利要求12所述的光拾取装置，其特征在于，所述保持构件的被熔覆的面进行镜面加工，
所述光学部件的被熔覆的面没有进行镜面加工。
16.如权利要求14所述的光拾取装置，其特征在于，由所述结晶性树脂形成的保持构件的表面自由能量比由所述非结晶性树脂形成的光学部件的表面自由能量小。
17.如权利要求12所述光拾取装置，其特征在于，对所述光学部件的进行熔覆的部分实施UV臭氧处理、等离子处理、电晕处理中的任一种处理。
18.如权利要求12所述的光拾取装置，其特征在于，所述光学部件在所述熔覆部分的长度方向的端部，具有与其他部分相比陷入的部分，
在该陷入的部分形成并熔覆所述保持构件的凸缘。
19.一种熔覆结构的制造方法，其特征在于，其为将第一部件熔覆于第二部件的熔覆结构的制造方法，
所述第一部件能够透过激光，所述第二部件不透过激光，
包括：使所述第一部件与所述第二部件接触的工序，
通过所述第一部件，对所述第二部件的与所述第一部件接触的区域照射激光的工序，
通过所述照射使所述第二部件熔融而熔覆于所述第一部件的工序，
在照射所述激光前，所述第一部件的进行熔覆的部分的表面粗糙度，比与所述部分接触的部分的第二部件的表面粗糙度大。
20.一种熔覆结构，其特征在于，其为将第一部件熔覆于第二部件的熔覆结构，
所述第一部件能够透过激光，所述第二部件不透过激光，
所述第一部件与所述第二部件的熔覆部分，其周边部分的粗糙度比中央部分的粗糙度大。
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