Patent EP0195411A2 successfully refreshed from Google Patents.
EP0195411A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Magnetic head
Assignee: Maxell Ltd
•
Filing: 1986-03-18
•
Granted: —
•
Expires: 2006-03-18
Abstract
Abstract In a magnetic head comprising a first and second core halves bonded together defining a magnetic gap, an anti-magnetic thin layer is formed on the surface of each core half facing to the magnetic gap using materials being hard to chemically react with the component of an amorphous metallic magnetic thin layer of each half and low melting of point glass, and low melting point glass thin layer formed on the anti-magnetic thin layer made of glass having a melting of point of temperature lower than the crystallization temperature of the amorphous metallic magnetic thin layer.
Inventors
- 👤 Takeshi Tottori
- 👤 Hideo Fujiwara
- 👤 Osamu Inagoya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/21; G11B5/265; G11B5/2652; G11B5/2654; G11B5/2655
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
A magnetic head comprising a first core half and a second core half bonded to the first core half defining a magnetic gap at one end portion of the magnetic head and an amorphous metallic magnetic thin layer having a high saturation magnetic flux density disposed near the magnetic gap, wherein an improvement comprises at least one anti-magnetic thin layer formed on the surface of each core half facing to the magnetic gap using materials being hard to chemically react with the component of the amorphous metallic magnetic thin layer and low melting point glass, and low melting point glass thin layer formed on the anti-magnetic thin layer made of glass having a melting of point of temperature lower than the crystallization temperature of the amorphous metallic magnetic thin layer.
Claim 2
Dependent Claim
130 words
A magnetic head comprising a first core half and a second core half bonded to the first core half defining a magnetic gap at one end portion of the magnetic head and an amorphous metallic magnetic thin layer having a high saturation magnetic flux density disposed near the magnetic gap, wherein an improvement comprises at least one anti-magnetic thin layer formed on the surface of each core half facing to the magnetic gap using materials being hard to chemically react with the component of the amorphous metallic magnetic thin layer and low melting point glass, and low melting point glass thin layer formed on the anti-magnetic thin layer made of glass having a melting of point of temperature lower than the crystallization temperature of the amorphous metallic magnetic thin layer.
Claim 3
Dependent Claim
17 words
The magnetic head according to claim 1, wherein the magnetic gap length is smaller than 2.0 µm.
Claim 4
Dependent Claim
42 words
The magnetic head according to claim 1, wherein said amorphous metallic magnetic thin layer is made of materials having crystallization temperature higher than 530°C and the glass of the low melting point glass thin layers has a softening temperature lower than 430°C.
Claim 5
Dependent Claim
116 words
The magnetic head according to claim 1, wherein said amorphous metallic magnetic thin layer is made of an alloy comprising one or more elements selected from the group consisting of iron, nickel, cobalt, and one or more elements selected from the group consisting of phosphorus, carbon, boron, silicon or an alloy comprising the above mentioned alloy as the main component and one or more additional elements selected from the group consisting of aluminum, germanium, beryllium, tin, indium, molybdenum tungsten, titanium, manganese, chromium, zirconium, hafnium, niobium, boron, silicon, vanadium and ruthenium or an alloy in which cobalt or niobium is used as the main component and one or more of the above mentioned additional elements are added.
Claim 6
Dependent Claim
32 words
The magnetic head according to claim 2, wherein the low melting point glass is composition containing PbO as the main component and the anti-magnetic thin layer is made of Si 0 2.
Claim 7
Dependent Claim
32 words
The magnetic head according to claim 2, wherein the thickness of the low melting point glass thin layer is lower than 1/1 of the thickness of the amorphous metallic magnetic thin layer.
Claim 8
Dependent Claim
17 words
The magnetic head according to claim 5, wherein the magnetic gap length is smaller than 0.5 µm.
Claim 9
Dependent Claim
31 words
The magnetic head according to claim 6, wherein the thickness of the low melting point glass thin layer is 3/5 to 1/6 of thickness of the amorphous metallic magnetic thin layer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.