Sony Corporation

Sony Precision Technology Inc.

Osamu Ochiai

Yuji Nagai

Hideo Maejima

Ken Onoe

Disclosed herein is a magnetic scale including a pipe, a strip-shaped magnetic member having a one side surface in the direction across the thickness thereof as a contact surface adapted to be closely attached to the inner surface of the pipe and the other side surface opposite to the one side surface as a back surface, the magnetic member being inserted in the pipe so as to extend straight in the longitudinal direction of the pipe, the magnetic member being formed with magnetic marks provided by a plurality of N poles and S poles alternately arranged in the longitudinal direction of the magnetic member, and a retainer member inserted in the pipe to press the back surface of the magnetic member toward the contact surface of the magnetic member, thereby maintaining a closely contact condition of the contact surface to the inner surface of the pipe. Accordingly, the magnetic member can be reliably protected to thereby improve its durability.

Magnetic scale

A magnetic scale is disclosed wherein a magnetic member is protected with certainty to effectively enhance the durability. The magnetic scale includes a magnetic member provided between outside and inside pipe members and has magnetic graduations magnetized alternately with the N and S poles along the extending direction thereof. When the magnetic member and the inside pipe member are assembled in the outside pipe member, the inside pipe member contacts partly with an inner face of the outside pipe member and partly with a back face of the magnetic member in such a manner as to cover the overall back face. The outer face of the inside pipe member presses the back face of the magnetic member over the overall length so that the close contact face of the magnetic member is closely contacted with the inner face of the outside pipe member.

A magnetic scale includes a pipe and a polarizable magnetic member closely attached to the inner surface of the pipe so as to extend in the longitudinal direction of the pipe. The magnetic member is formed with magnetic marks provided by a plurality of N poles and S poles alternately arranged in the longitudinal direction of the magnetic member. Accordingly, the magnetic member can be reliably protected to thereby improve its durability.

Digital gauge

A scale device 1 includes a base unit 2 comprised of an elongated casing 3 wherein an elongated thin-plate-like scale 4 is secured with the a mid portion of the thin-plate-like scale 4 kept in a floating state and a slider unit 10 slidable relative to the base unit 2. The slider unit 10 has a sensor 15 for detecting magnetic graduations recorded on the thin-plate-like scale 4. A reference sliding member 16 is provided for maintaining a constant separation between the sensor 15 and the recording surface of the magnetic graduations of the thin-plate-like scale 4. A pressing sliding member 17 is provided for pressing the reference sliding member 16 so that the recording surface of the magnetic graduations are perpetually contacted with the reference sliding member 16. A detection head unit 14 is movable telescopically relative to the thin-plate-like scale 4 in a direction along the width of the scale.

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Kanagawa, Japan

Osamu Ochiai