Three dimensional measuring apparatus

• US 5,402,364 A
• Filed: 01/15/1993
• Issued: 03/28/1995
• Est. Priority Date: 01/15/1993
• Status: Expired due to Term

• Current Assignee: Sanyo Machine Works Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Machine Works Ltd. (Panasonic Holdings Corporation)
• Inventors: Ohshima, Masatoshi, Kitoh, Hiroyuki
• Primary Examiner(s): Harvey, Jack B.
• Assistant Examiner(s): PEESO, THOMAS R
• Application Number:
  US08/005,128
• Time in Patent Office: 802 Days
• Field of Search: 364/560, 364/507, 250/578.1, 250/227.29, 250/227.28, 250/227.26, 250/208.1, 250/206.2, 250/206.1
• US Class Current: 702/167
• CPC Class Codes: G01B 11/022 by means of tv-camera scanning
• CPC Class Codes: G01B 11/245 using a plurality of fixed, simultaneously operating transducers G01B11/2408 - G01B11/2425, G01B11/255 take precedence

Abstract

A three-dimensional measuring apparatus includes a minimum of a pair of CCD cameras which respectively pick up an image of an objective surface of an objective workpiece requiring dimensional measurement. At least a single unit or a pair of laser scanner sequentially irradiates a plurality of spots on the measurable surface with laser beams. The spots respectively make up measuring points when operating the pair of CCD cameras for measuring dimensions of the objective surface. The laser scanner directly displays the results of the dimensional measurement on the objective surface. An image processing unit computes actual dimensions of the objective surface based on image data received from the pair of CCD cameras which computer system initially makes a comparison between dimensional data of the measured surface received from the image processing unit and basic data of the objective surface previously prepared in the course of designing the objective product, and then figures out a specific domain of the measured objective surface that has actually incurred error from the manufacturing process.

Claims

1. A three-dimensional measuring apparatus comprising:

a minimum of a pair of CCD cameras which respectively pick up an image of an objective surface of an objective workpiece requiring dimensional measurement;

at least a single unit or a pair of laser scanner(s) which sequentially irradiates a plurality of spots on said objective surface with a laser beam, wherein said spots respectively make up measuring points when operating said pair of CCD cameras for measuring dimensions of said objective surface, and wherein said laser scanner directly irradiates on said objective surface a specific domain of said objective surface that has actually incurred error from a manufacturing process;

an image processing unit which computes actual dimensions of said objective surface based on image data received from said pair of CCD cameras; and

a computer system which initially makes a comparison between dimensional data of said objective surface received from said image processing unit and basic data of said objective surface previously prepared during design of said objective workpiece, and then determines said specific domain of said objective surface that has actually incurred error from said manufacturing process.