Measuring instrument

• US 7,721,455 B2
• Filed: 10/31/2008
• Issued: 05/25/2010
• Est. Priority Date: 11/05/2007
• Status: Active Grant

• Current Assignee: Mitutoyo Corporation
• Original Assignee: Mitutoyo Corporation
• Inventors: Shiraishi, Yoshiaki, Suzuki, Mikio, Hayashida, Shuji, Hayashi, Nobuyuki, Matsumiya, Sadayuki
• Primary Examiner(s): Bennett; G. Bradley
• Application Number:
  US12/289,684
• Publication Number:
  US 20090113734A1
• Time in Patent Office: 571 Days
• Field of Search: 335/05, 337/06, 337/07, 337/08, 337/83, 337/84, 337/92, 337/95, 338/13
• US Class Current: 33/505
• CPC Class Codes: G01B 3/205 provided with a counter for digital indication of the measured dimension

Abstract

A measuring instrument includes a detector that outputs a measured value, a digital display unit, an analog display unit having a plurality of display segments, and a display controller. The display controller includes: a tolerance range display unit that lights or blinks display segments corresponding to a preset tolerance range relative to a preset value; a first determiner that obtains a difference between the present value and a present measured value and determines whether the difference is within an analog display range wider than the tolerance range; a difference display unit that lights a display segment corresponding to the last one or the last two digits of the present measured value when the first determiner determines that the difference is within the analog display range; a second determiner that determines whether the difference is within the tolerance range; and an acceptance or rejection display unit that displays a result determined by the second determiner.

Claims

1. A measuring instrument comprising:

a detector that outputs a measured value as an electric signal;

a digital display unit;

an analog display unit in which a plurality of display segments are arranged at equal intervals in an encircling belt; and

a display controller that displays the measured value detected by the detector on the digital display unit and the analog display unit,

wherein the display controller includes;

a tolerance range display unit that lights or blinks display segments corresponding to a preset tolerance range relative to a preset value;

a first determiner that obtains a difference between a preset value and a present measured value, and determines whether the difference is within an analog display range wider than the tolerance range;

a difference display unit that lights a display segment corresponding to last one or last two digits of the present measured value when the first determiner determines that the difference is within the analog display range;

a second determiner that determines whether the difference is within the tolerance range; and

an acceptance or rejection display unit that displays a result determined by the second determiner.

2. The measuring instrument according to claim 1, wherein the analog display range is set to correspond to one encircling circumferential length or several encircling circumferential lengths of the analog display unit.

3. The measuring instrument according to claim 1, wherein the analog display unit includes 100 display segments arranged at equal intervals on an encircling circumference thereof to display two digits after decimal point of the present measured value.

4. The measuring instrument according to claim 1, wherein the digital display unit includes a first digital display unit that displays the measured value as a numerical value and a second digital display unit that displays a difference between the present measured value and the preset value as a numerical value.