Claims
- 1. A lapping tape comprising a base and a coat having abrasive particles formed thereon, said abrasive particles consisting of:
- an acicular iron oxide powder having a surface area of at least 30 m.sup.2 /g as determined by BET method and selected from the group of magnetite, .gamma.-iron, and cobalt-containing .gamma.-iron oxide; and
- a granular inorganic powder having a Moh's hardness of more than 7 and contained in an amount of 2.0 to 30 percent by weight on the basis of the weight of the oxide powder, said coating having a centerline mean roughness of 0.015 to 0.025 .mu.m.
- 2. A lapping tape according to claim 1 wherein said acicular iron oxide is magnetic.
- 3. A lapping tape according to claim 1 wherein said inorganic powder ranges in particle diameter from 0.05 to 0.4 .mu.m.
- 4. A method of polishing the magnetic heads of a video recorder which comprises contacting the magnetic heads with the lapping tape as recited in claim 1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-77998 |
Apr 1988 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 331,637, filed Mar. 30, 1989, abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4379800 |
Sato et al. |
Apr 1983 |
|
4476177 |
Mizuno et al. |
Oct 1984 |
|
4478908 |
Mizuno et al. |
Oct 1984 |
|
4701364 |
Miyoshi et al. |
Oct 1987 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
331637 |
Mar 1989 |
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