JPS6442522U - - Google Patents
Info
- Publication number
- JPS6442522U JPS6442522U JP1987134602U JP13460287U JPS6442522U JP S6442522 U JPS6442522 U JP S6442522U JP 1987134602 U JP1987134602 U JP 1987134602U JP 13460287 U JP13460287 U JP 13460287U JP S6442522 U JPS6442522 U JP S6442522U
- Authority
- JP
- Japan
- Prior art keywords
- hole
- substrate
- circular substrate
- optical disk
- recording layer
- 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
- 239000000758 substrate Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987134602U JPS6442522U (zh) | 1987-09-04 | 1987-09-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987134602U JPS6442522U (zh) | 1987-09-04 | 1987-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6442522U true JPS6442522U (zh) | 1989-03-14 |
Family
ID=31393510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987134602U Pending JPS6442522U (zh) | 1987-09-04 | 1987-09-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6442522U (zh) |
-
1987
- 1987-09-04 JP JP1987134602U patent/JPS6442522U/ja active Pending