Moving object inspection system

• US 4,305,658 A
• Filed: 01/07/1980
• Issued: 12/15/1981
• Est. Priority Date: 01/19/1979
• Status: Expired due to Term

• Current Assignee: Hajime Industries Limited
• Original Assignee: Hajime Industries Limited
• Inventors: Yoshida, Hajime
• Primary Examiner(s): ROSENBERGER, RICHARD A
• Application Number:
  US06/109,976
• Time in Patent Office: 708 Days
• Field of Search: 356/23, 356/372, 356/388, 356/394, 358/93, 358/101, 358/106, 358/107
• US Class Current: 356/23
• CPC Class Codes: H04N 7/188 Capturing isolated or intermittent images triggered by the occurrence of a predetermined event, e.g. an object reaching a predetermined position signal generation from motion picture films H04N5/253

Abstract

A moving object inspection system is disclosed in which a stroboscope radiation is made on an object to be inspected, the object is picked up by a television camera, a position detection device provides a position detection signal when the object arrives at a specified position, and an object inspection apparatus is provided. In this apparatus the period including before and after the horizontal synchronizing signal from the television camera is set as an inspection intermission period during which no inspection for the object is conducted, and the stroboscope radiation is carried out at the same timing as the position detection signal when the position detection signal arrives at the same time as the vertical synchronizing signal from the television camera, or at the beginning of the inspection intermission period immediately after the position detection signal when the position detection signal arrives at any other time than with the vertical synchronizing signal.

A moving object inspection system further sets an inspection inhibit period of the object immediately after the stroboscope radiation.

Claims

1. A moving object inspection apparatus comprising:

(a) an image sensing device;

(b) said image sensing device being of the scanning type in which a video signal, a horizontal synchronizing signal and a vertical synchronizing signal are produced;

(c) a stroboscope which is effective when energized to illuminate said moving object with a pulse of light short enough to produce a substantially static image of said moving object in said image sensing device;

(d) a position detector which is effective to produce a position detection signal when said moving object reaches a predetermined position;

(e) an object inspection apparatus for inspecting said video signal;

(f) means for inhibiting said object inspection apparatus for horizontal intermission periods extending from before the beginning of each of said horizontal synchronizing signals until after the end thereof and for vertical intermission periods extending from before the beginning of each of said vertical synchronizing signals until after the end thereof;

(g) means for energizing said stroboscope;

(h) said means for energizing being responsive to the simultaneous occurrence of said position detection signal with said vertical synchronizing signal; and

(i) said means for energizing being further responsive to the beginning of the first horizontal intermission period following occurrence of said position detection signal when said position detection signal occurs between successive vertical synchronizing signals.

2. A moving object inspection apparatus according to claim 1, wherein said means for inhibiting includes an intermission period signal generator responsive to said vertical and horizontal synchronizing signals to generate said vertical and horizontal intermission periods and vertical and horizontal strobes.

3. A moving object inspection apparatus according to claim 1, wherein said means for energizing is responsive to said vertical and horizontal strobes and said position detection signal to produce a stroboscope signal.

4. A moving object inspection apparatus according to claim 3, wherein said means for inhibiting further includes an inspection inhibition signal generator responsive to said stroboscope signal to produce an inspection inhibition signal and an inspector control signal generator responsive to any one or more of said vertical and horizontal strobes to remove an enable signal from said object inspection apparatus whereby inspection of said video signal is interrupted.

5. A moving object inspection apparatus according to claim 4, wherein said inspector control signal generator is further responsive to said inspection inhibition signal to remove said enable signal.