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US Patent: 5,477,621
Electrical Capacitance Instrument and Manufacturing Method of the Same
Patentees:
Hiroshi Koizumi - Utsunomiya, Japan
Toshiyuki Shirai - Utsunomiya, Japan
Tamio Suzuki - Utsunomiya, Japan

USPTO Classifications:
29/592.1, 33/784

Tool Categories:
layout tools : measurement gauges

Assignees:
Mitutoyo Corp. - Tokyo, Japan

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Apr. 22, 1994
Granted: Dec. 26, 1995

Patent Pictures:
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Description:
Oliff & Berridge, PLC - patent attorneys

Abstract

An electrical capacitance instrument achieving high-volume production and a manufacturing method for the same. In a slide caliper detecting a change of electrical capacitance upon a displacement value of the slider 10 in relation to the base scale 1 having the main scale 20 of the measuring standard, the improved slide caliper is structured by the main scale 20 defined by plural electrodes 21 printed on a surface of the base plate 22 made of an insulator film at predetermined intervals with electrically conductive ink, and the base scale 1 is made by injection molding using a material of engineering plastics on which the main scale 20 is applied securely, so that the slide caliper can be manufactured in large numbers.

Applications filed in Japan, 26 Apr 1993 & 19 Nov 1993.

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