JPS6450250A - Optical disk substrate - Google Patents
Optical disk substrateInfo
- Publication number
- JPS6450250A JPS6450250A JP62206272A JP20627287A JPS6450250A JP S6450250 A JPS6450250 A JP S6450250A JP 62206272 A JP62206272 A JP 62206272A JP 20627287 A JP20627287 A JP 20627287A JP S6450250 A JPS6450250 A JP S6450250A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- information recording
- hub
- plane
- recording area
- 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.)
- Pending
Links
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
PURPOSE:To suppress the double refraction of a substrate generated due to thermal stress from being increased, by providing a clamping member at almost center part of a plane at the opposite side of an information recording plane, and providing a groove preventing diffusion of stress at the plane where the clamping member of the substrate is arranged. CONSTITUTION:In an information recording area 2, a track group transferred at the time of performing injection molding, or a recording film or a reproducing reflection film is formed on a bit, and a metallic hub 3 for clamping is integrated with a hub holder 4 made of polycarbonate by insert molding, and the hub holder 4 is jointed on the substrate 1. Also, in the joint part of the hubs 3 and 4 of the substrate 1, grooves 6 are provided on the outside of the joint parts of the hubs 3 and 4, and two planes of a disk are protected by setting the information recording area inside, and are adhered by a bonding layer 7, then, an optical disk capable of using both planes can be constituted. In such a way, propagated stress generated due to the distortion of the hub metal 3 due to the difference of the coefficients of thermal expansion of the hub metal 3 and the substrate 1 is absorbed as the deformation of the groove, thereby, it is possible to suppress the double refraction of the substrate in the information recording area from being increased, and to prevent a reproducing performance from being lowered.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206272A JPS6450250A (en) | 1987-08-21 | 1987-08-21 | Optical disk substrate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206272A JPS6450250A (en) | 1987-08-21 | 1987-08-21 | Optical disk substrate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6450250A true JPS6450250A (en) | 1989-02-27 |
Family
ID=16520578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62206272A Pending JPS6450250A (en) | 1987-08-21 | 1987-08-21 | Optical disk substrate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6450250A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02136476U (en) * | 1989-04-13 | 1990-11-14 | ||
WO1997050079A1 (en) * | 1996-06-26 | 1997-12-31 | Sony Corporation | Magnetic disk apparatus, magnetic disk and disk cartridge |
-
1987
- 1987-08-21 JP JP62206272A patent/JPS6450250A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02136476U (en) * | 1989-04-13 | 1990-11-14 | ||
WO1997050079A1 (en) * | 1996-06-26 | 1997-12-31 | Sony Corporation | Magnetic disk apparatus, magnetic disk and disk cartridge |
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