Test indicator

Patent metadata

Field	Value
Publication number	US-9933277-B2
Application number	US-201615006243-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	Feb 9, 2015
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

There is provided a test indicator with which a correct measurement value can be easily obtained. A test indicator includes a gauge head including a contact ball at a tip end, a body case which pivotally supports the gauge head, and a rotary encoder which detects a rotation displacement amount of the gauge head. The test indicator further includes a correction unit which corrects a measurement value according to an angle θ between a measurement target surface W and the gauge head. The correction unit includes an angle memory which stores the angle θ between the measurement target surface W and the gauge head, a correction coefficient calculation unit which calculates a correction coefficient according to the angle θ, and a correction arithmetic unit which multiplies, by the correction coefficient, a displacement amount of the contact ball based on a detection value by the rotary encoder.

First claim

What is claimed is:

1. A test indicator comprising:
a gauge head including a contact ball at a tip end;
a body case configured to pivotally support the gauge head;
a rotary encoder configured to detect a rotation displacement amount of the gauge head;
a display unit configured to display a measurement value based on a detection value by the rotary encoder; and
a correction unit including a processor configured to correct the measurement value according to an angle θ between a measurement target surface and the gauge head by receiving the angle θ, determining a correction coefficient based on a cosine of the angle θ, determining a displacement amount by converting the rotation displacement amount into a straight line, and multiplying the correction coefficient by the displacement amount.

2. The test indicator according to claim 1 , wherein
the correction unit further comprises:
an angle memory configured to store the angle θ between the measurement target surface and the gauge head and provide the angle θ to the processor.

3. The test indicator according to claim 1 , wherein the display unit displays a message for a user to input the angle θ between the measurement target surface and the gauge head.

4. The test indicator according to claim 1 , further comprising an angle scale provided around a rotation axis of the gauge head on a side surface of the test indicator.

Assignees

• Mitutoyo Corp

Inventors

• Terauchi Tatsushi

Classifications

• G01B21/045

  Correction of measurements (G01B9/02055 takes precedence) · CPC title

• G01D5/04 Primary

  using levers; using cams; using gearing · CPC title

• G01B5/28

  for measuring roughness or irregularity of surfaces · CPC title

• G01B5/285

  for controlling eveness · CPC title

• G01B5/00 Primary

  Measuring arrangements characterised by the use of mechanical techniques · CPC title