Koji Shima

US Patent:

6350178, Feb 26, 2002

Filed:

Dec 22, 2000

Appl. No.:

09/747808

Inventors:

Joel R. Weiss - Fremont CA
Koji Shima - Saratoga CA
Joseph Leigh - Cupertino CA
Hiroshi Konishi - Cupertino CA
Nobuo Kurataka - Itami, JP
Hiroki Hara - Itami, JP
Naoki Inoue - Itami, JP

Assignee:

Akashic Memories Corp. - San Jose CA

International Classification:

B24B 100

US Classification:

451 41, 451 63

Abstract:

Magnetic recording media-are provided having separately textured data and read/write head landing zones. Separating these zones on the recording surface allows independent optimization of the topology to maximize both recording characteristics and mechanical durability. The landing or contact start stop zone has an average surface roughness greater than that of the data zone. Preferably, a transition zone extends between the contact start stop zone and the data zone, the transition zone varying between the two in average surface roughness. Preferably, the contact start stop zone is textured first, followed by the data zone, thereby ensuring uniform stiction performance. Texture machines for producing such zone texturing and texturing methods are also provided.

US Patent:

8453311, Jun 4, 2013

Filed:

Apr 29, 2008

Appl. No.:

12/111807

Inventors:

Robert Lloyd Babcock - Milpitas CA, US
Koji Shima - Saratoga CA, US

Assignee:

Seagate Technology LLC - Cupertino CA

International Classification:

B23P 13/04

US Classification:

29558, 29559, 269 9, 83 29

Abstract:

A method of forming a batch of uniformly shaped glass sheet objects is disclosed. A stack of glass sheets is placed in a frame and submerged in a coolant. A hole is drilled through the stack. The cores of the hole and any debris from the drilling process are swept away in the coolant and pumped through a filter. A pin is inserted into the hole and attached to the base. A head on the pin, or a washer, fixes the stack of glass to the base at the hole. An outer profile is then cut in the glass stack around the hole while the formed objects are held to a base of the frame by the pin. Again, any debris is swept away in the coolant. The uniformly shaped objects are removed from the frame and separated. The glass sheet objects are preferably usable as a substrate for a magnetic or magneto-optical (MO) data/information storage retrieval medium.

US Patent:

20060109591, May 25, 2006

Filed:

Nov 19, 2004

Appl. No.:

10/993739

Inventors:

Rajiv Ranjan - San Jose CA, US
Shashi Agarwal - Santa Clara CA, US
Ian Beresford - Milpitas CA, US
Koji Shima - Saratoga CA, US
Keith Goodson - San Jose CA, US
Joel Weiss - Fremont CA, US

International Classification:

G11B 5/82

US Classification:

360135000

Abstract:

A method for making substrates is disclosed. The method comprises providing a rod, which is made out of a substrate material and has an outside diameter substantially the same size as the outside diameter of a finished substrate and an inside diameter substantially the same size as the inside diameter of the finished substrate. The rod is cut with a multi-wire cutter to make a substrate slice substantially the same size as a finished substrate. The multi-wire cutter has wires positioned to substantially match the final thickness of the finished substrate. Additionally the cutting process is facilitated by using slurry and by providing a rocking motion between the rod and the wires of the multi-wire cutter so that the wires contact the rod in a rocking motion with respect to a normal to the center of the rod.

US Patent:

61935905, Feb 27, 2001

Filed:

Mar 26, 1998

Appl. No.:

9/048869

Inventors:

Joel R. Weiss - Fremont CA
Koji Shima - Saratoga CA
Joseph Leigh - Cupertino CA
Hiroshi Konishi - Cupertino CA
Nobuo Kurataka - Itami, JP
Hiroki Hara - Itami, JP
Naoki Inoue - Itami, JP

Assignee:

Akashic Memories Corp. - San Jose CA

International Classification:

B24B 2106

US Classification:

451163

Abstract:

Magnetic recording media are provided having separately textured data and read/write head landing zones. Separating these zones on the recording surface allows independent optimization of the topology to maximize both recording characteristics and mechanical durability. The landing or contact start stop zone has an average surface roughness greater than that of the data zone. Preferably, a transition zone extends between the contact start stop zone and the data zone, the transition zone varying between the two in average surface roughness. Preferably, the contact start stop zone is textured first, followed by the data zone, thereby ensuring uniform stiction performance. Texture machines for producing such zone texturing and texturing methods are also provided.

US Patent:

57981647, Aug 25, 1998

Filed:

Jul 18, 1995

Appl. No.:

8/503785

Inventors:

Joel R. Weiss - Fremont CA
Koji Shima - Saratoga CA
Joseph Leigh - Cupertino CA
Hiroshi Konishi - Cupertino CA
Nobuo Kurataka - Itami, JP
Hiroki Hara - Itami, JP
Naoki Inoue - Itami, JP

Assignee:

Stormedia, Inc. - Santa Clara CA

International Classification:

G11B 564

US Classification:

428141

Abstract:

Magnetic recording media are provided having separately textured data and read/write head landing zones. Separating these zones on the recording surface allows independent optimization of the topology to maximize both recording characteristics and mechanical durability. The landing or contact start stop zone has an average surface roughness greater than that of the data zone. Preferably, a transition zone extends between the contact start stop zone and the data zone, the transition zone varying between the two in average surface roughness. Preferably, the contact start stop zone is textured first, followed by the data zone, thereby ensuring uniform stiction performance. Texture machines for producing such zone texturing and texturing methods are also provided.