Three dimensional imaging device

• US 5,018,854 A
• Filed: 04/10/1990
• Issued: 05/28/1991
• Est. Priority Date: 04/17/1989
• Status: Expired due to Term

• Current Assignee: National Research Council Canada
• Original Assignee: National Research Council Canada
• Inventors: Rioux, Marc
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US07/506,792
• Time in Patent Office: 413 Days
• Field of Search: 356/375, 356/376, 250/201.2, 250/201.4, 250/201.8
• US Class Current: 356/609
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures

Abstract

A three dimensional imaging device has a converging lens system defining an optical axis extending in a direction Z, and a color sensitive position sensitive detector having a series of pixels extending in at least one of two mutually perpendicular directions X and Y both perpendicular to the direction Z. The lens system serves to simultaneously image a plurality of distributed points on a target surface onto the detector to generate first data on the coordinate of each point in at least a selected one, and preferably both, of the directions X and Y. A mask with a pair of differently colored filters, e.g. red and blue, spaced apart from each other in the selected direction is mounted in the lens system for forming a pair of discrete images on the detector of each point, such images being formed each in a respective color. The result is to generate, by means of measurement of the spacing between the images, second data on the coordinate of each point in the direction Z. The first and second data can then be extracted for all the points by scanning the pixels.

Claims

1. An imaging device having a converging lens system defining an optical axis extending in a direction Z, and a color sensitive position sensitive detector having a series of pixels extending in at least one of two mutually perpendicular directions X and Y both perpendicular to said direction Z, said lens system serving to simultaneously image a plurality of distributed points on a target surface onto the detector to generate first data on the coordinate of each said point in at least a selected one of the directions X and Y;

a mask having a pair of differently colored filters spaced apart from each other in said selected direction for forming discrete images on the detector of each said point in a respective color, whereby to generate, by means of the spacing between said images, second data on the coordinate of each said point in the depiction Z; and

means for scanning said pixels to extract said first and second data for all said points.

2. The device of claim 1, wherein the mask is located substantially in the aperture plane of the lens system.

3. The device of claim 1, wherein said filters are symmetrically located on opposite sides of the optical axis and are each circular in shape.

4. The device of claim 1, including means for illuminating the target surface.

5. The device of claim 1, wherein said illuminating means projects a structured pattern of light onto the target surface.

6. The device of claim 1, wherein said position sensitive detector is bidimensional having an array of pixels extending in both said X and Y directions.