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US Patent: 4,578,868
Digital Display Measuring Apparatus
Patentees:
Kohji Sasaki (exact or similar names) - Kanagawa, Japan
Yoshihiro Arai (exact or similar names) - Kanagawa, Japan
Yasuyuki Yamaguchi (exact or similar names) - Kanagawa, Japan
Toshiyuki Matsumoto (exact or similar names) - Kanagawa, Japan

USPTO Classifications:
33/706, 33/819, D10/73

Tool Categories:
layout tools : measurement gauges

Assignees:
Mitutoyo Mfg. Co. Ltd. - Tokyo, Japan

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Mar. 30, 1984
Granted: Apr. 01, 1986

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
Description:
Koda & Androlia - patent attorneys

Abstract

A digital display measuring system includes a movable and stationary members between which an object to be measured is located, these members respectively supporting transmitter and receiver electrodes which define a variable capacitor having its electrostatic capacity which is adapted to change as the movable member is displaced relative to the stationary member. The change of electrostatic capacity is detected and converted into an electrical signal which is digitally indicated on a display to show the mechanical displacement of the movable member.

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