Keel-tipped stylus, and method and device for making keel-tipped stylus
AssigneeSanyo Electric Co., Ltd.
InventorsToshiyuki Kudo, Kazuo Itoh, Masafumi Kitamura
Life of this patent
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Abstract
A keel-tipped stylus has a constricted terminal portion which is mounted on narrow shoulders which is in turn mounted on wide shoulders. The keel-tipped stylus is formed from a V-shaped stylus which engages into a spiral groove formed in an abrasive lapping disc. As the lapping disc rotates, the V-shaped stylus runs along the groove to lap the constricted terminal portion together with the narrow and wide shoulders.
Claims8
A keel-tipped stylus for reading prerecorded information on a disc record groove, said keel-tipped stylus comprising:
- a body made of electrically non-conductive, hard and brittle material, said body comprising:
- first and second surfaces bevelled with each other and intersecting at a prow line;
- a front surface extending between said first and second bevelled surfaces with a predetermined acute angle contained between said prow line and said front surface, said front surface being tapered;
- a pair of first shoulders extending, respectively, from opposite sides of said front surface to said first and second bevelled surfaces;
- a pair of second shoulders provided adjacent to said first shoulders on a tapered side and extending, respectively, from opposite sides of said front surface to said first and second bevelled surfaces;
- a pair of first side surfaces joining said first shoulders to said second shoulders, respectively;
- and
- a fore-and-aft constricted terminal portion defined by a pair of second side surfaces extending from said second shoulders, respectively, and a bottom surface extending between said second side surfaces;
- and
- an electric conductive film, deposited on said front face of the body.
A keel-tipped stylus for reading prerecorded information on a disc record groove, said keel-tipped stylus comprising:
- a body made of electrically non-conductive, hard and brittle material, said body comprising:
- first and second surfaces bevelled with each other and intersecting at a prow line;
- a front surface extending between said first and second bevelled surfaces with a predetermined acute angle contained between said prow line and said front surface, said front surface being tapered;
- a first shoulder extending from one opposite side of said front surface to said first bevelled surface;
- a pair of second shoulders provided adjacent to said first shoulder on a tapered side and extending from opposite sides of said front surface to said first and second bevelled surface, respectively;
- a first side surface joining said first shoulder to one of said second shoulder;
- and
- a fore-and-aft constricted terminal portion defined by a pair of second side surfaces extending from said second shoulders, respectively, and a bottom surface extending between said second side surfaces;
- and
- an electric conductive film, deposited on said front face of the body.
Dependencies are inferred from the claim text.