Claims
- 1. A method of manufacturing a medium having a magnetic pattern, comprising the steps of:
- forming a first groove in a substrate by photoetching;
- forming a second groove in said first groove or in a portion of said substrate adjacent to said first groove by said photoetching, the second groove being different in depth from the first groove; filling up said first and second grooves with a ferromagnetic substance, the ferromagnetic substance in said first groove being different in thickness from the ferromagnetic substance in said second groove; and
- magnetizing said ferromagnetic substance to produce magnetic field intensity distribution based on the thickness of the magnetized ferromagnetic substance.
Priority Claims (3)
Number |
Date |
Country |
Kind |
3-034935 |
Mar 1991 |
JPX |
|
3-099354 |
May 1991 |
JPX |
|
3-099355 |
May 1991 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 087/011,791 filed Feb. 1, 1993, now U.S. Pat. No. 5,336,586, which is a division of application Ser. No. 07/842,057 filed Feb. 26, 1992, now U.S. Pat. No. 5,350,618.
US Referenced Citations (14)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0120990 |
Oct 1984 |
EPX |
61-54857 |
Mar 1986 |
JPX |
1100910 |
May 1986 |
JPX |
8809979 |
Dec 1988 |
WOX |
Non-Patent Literature Citations (2)
Entry |
Extended Abstracts, vol. 82, No. 2, Oct. 1982, Princeton, N.J., pp. 291-292, van den Hoek et al. |
Research Disclosure, Nov. 1992, pp. 869-874. |
Divisions (2)
|
Number |
Date |
Country |
Parent |
11791 |
Feb 1993 |
|
Parent |
842057 |
Feb 1992 |
|