公开(公告)号：JP2010198690A

公开(公告)日：2010-09-09

申请号：JP2009043132

申请日：2009-02-25

Applicant: Hoya Corp ,  Hoya株式会社

Inventor： MAEDA NOBUHIRO ,  UCHIDA KAZUYA ,  FUJIMOTO MAMORU ,  SATO TAKASHI

IPC: G11B5/73 ,  C03B11/00 ,  G11B5/82 ,  G11B5/84

CPC classification number: Y02P40/57

Abstract: PROBLEM TO BE SOLVED: To provide a glass blank in which, even when a thick portion is provided at a center, a portion other than the thick portion is thinned, and a crack is prevented from occurring after press. SOLUTION: The glass blank 1 includes the disk-shaped thick portion 10, and the ring-shaped thin portion 20 which is provided, surrounding a periphery of the thick portion 10 and includes a smaller thickness than that of the thick portion 10. The thick portion 10 is convex with respect to at least one surface of the thin portion 20. On a surface on which the thin portion 20 and the thick portion 10 are formed so that a step is formed, a sloped surface extended from a flat surface portion 22 of the thin portion 20 to a topmost portion 12 of the thick portion 10 includes a curved surface 14. The curved surface and the flat surface portion 22 form a continuous surface. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为了提供一种玻璃坯料，其中即使在中心设置厚壁部分，除了厚壁部分之外的部分变薄，并且在压制后防止发生裂纹。 解决方案：玻璃坯料1包括圆盘形厚部分10和环形薄壁部分20，该环形薄壁部分20围绕厚部分10的周边并且包括比厚部分10的厚度更小的厚度 厚部分10相对于薄壁部分20的至少一个表面是凸的。在其上形成薄壁部分20和厚壁部分10的表面上形成台阶，从平坦部分延伸的倾斜表面 薄壁部分20的表面部分22到厚壁部分10的最上部分12包括一个曲面14.弯曲表面和平坦表面部分22形成连续表面。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2011111368A

公开(公告)日：2011-06-09

申请号：JP2009269806

申请日：2009-11-27

Applicant: Hoya Corp ,  Hoya株式会社

Inventor： MAEDA NOBUHIRO ,  UCHIDA KAZUYA ,  FUJIMOTO MAMORU ,  SATO TAKASHI

IPC: C03B11/00 ,  C03B11/08 ,  G11B5/84

CPC classification number: C03B11/088

Abstract: PROBLEM TO BE SOLVED: To obtain a glass blank having higher flatness even when the thinner glass blank is produced. SOLUTION: There are provided a method for producing the glass blank where the glass blank for an information recording medium is produced at least via a pressing step to press-mold softened glass between an upper die and a lower die after supplying the softened glass on the center of the pressing surface of the lower die and where the temperature in the vicinity of the center of the pressing surface of the upper die just before performing the pressing step is lower than that in another area on the pressing surface of the upper die, the upper die and a press-molding apparatus used in the method, a method for producing a substrate for the information recording medium using the apparatus and a method for producing the information recording medium. COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：即使制造较薄的玻璃坯料，获得具有较高平整度的玻璃坯料。 解决方案：提供一种玻璃坯料的制造方法，其中至少通过压制步骤制造用于信息记录介质的玻璃坯料，以在供给软化的玻璃坯料之后在上模和下模之间挤压软化玻璃 在下模的按压表面的中心处的玻璃，并且刚好在执行挤压步骤之前在上模的按压表面的中心附近的温度低于在上模的按压表面上的另一区域中的温度 模具，上模和在该方法中使用的加压成型装置，使用该装置的信息记录介质的基板的制造方法和信息记录介质的制造方法。 版权所有（C）2011，JPO＆INPIT

公开(公告)号：JP2000016822A

公开(公告)日：2000-01-18

申请号：JP20281498

申请日：1998-07-02

Applicant: HOYA CORP

Inventor： TSUKADA SHOGO ,  FUJIMOTO MAMORU

IPC: B24B9/00 ,  B24B9/08 ,  C03B21/02 ,  C03B23/055 ,  C03B35/26

Abstract: PROBLEM TO BE SOLVED: To provide a process for the production of a round glass rod, etc., enabling sure and stable introduction of a glass raw material to a roller and stable production of a round glass rod having a cross-section having high roundness in high yield. SOLUTION: A glass raw material 1 heated to attain a viscosity of