Scanning apparatus and method

• US 4,148,061 A
• Filed: 03/16/1977
• Issued: 04/03/1979
• Est. Priority Date: 05/18/1972
• Status: Expired due to Term

• Current Assignee: Jerome H. Lemelson
• Original Assignee: Jerome H. Lemelson
• Inventors: Lemelson, Jerome H.
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US05/778,331
• Time in Patent Office: 748 Days
• Field of Search: 358/101, 358/106, 358/107
• US Class Current: 348/125
• CPC Class Codes: G01B 11/022 by means of tv-camera scanning
• CPC Class Codes: G06T 1/0014 Image feed-back for automatic industrial control, e.g. robot with camera robots B25J19/023
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation
• CPC Class Codes: G07D 7/20 Testing patterns thereon G07D7/004, G07D7/005 take precedence

Abstract

An automatic scanning and control apparatus determines the location of a predetermined segment of an image field being scanned. The predetermined segment presents an image which is optically differentiatable from the surrounding area of the image field. The apparatus includes a beam device for selectively scanning the image field and producing an output signal thereof. The beam device includes means for modulating the output signal in accordance with variations in the image field. The predetermined segment of the image field causes modulation of the output signal of the beam device by providing an inflection therein when the beam scans across the segment. An analyzing circuit is adapted to accept the output signal from the beam device. Means generate a locating signal in predetermined time relation to the scanning. Comparator means compare the inflection in the output signal with the locating signal so that the location of the predetermined segment of the image field can be determined.

A method compares an image field to be inspected with a standard image field. A standard image field is scanned with a beam and a video signal is modulated in accordance with intensity variations in the standard field. The video signal is recorded on a recording member. The field to be inspected is then scanned by the beam and a second video signal is generated. Both the video signals are reproduced and passed to a comparator means. A point to point comparison is made between the inflections and variations in each signal resulting from the scanning image areas of contrasting intensity by generating pulse signals during the intervals that the areas do not coincide. The pulse signals are then automatically analyzed.

Claims

1. An automatic inspection apparatus comprising:

(a) means for supporting an article to be inspected at an inspection location,

(b) electro-optical scanning means disposed at said inspection location for examining articles to be inspected,

(c) said scanning means providing information signals including information concerning said articles as they are inspected,

(d) means for operating said article supporting means to move an article relative to said electro-optical scanning means,

(e) analyzing circuit means operable for receiving information signals from said scanning means and including means to analyze the information content of said signals, and

(f) detection means operable when an article is disposed at said inspection location for effecting the transmission of signals generated inspecting the article from said scanning means to said analyzing circuit.

2. An apparatus as defined in claim 1 wherein

said means for moving an article relative to said scanning means comprises a fixture disposed at said inspection station and a repeat cycle controller,

said fixture including a movable article manipulation means for retaining and moving an article conveyed to said inspection location,

said repeat cycle controller being responsive to a signal generated by said detection means to control said manipulation means to move an article in a predetermined manner to present different areas of said article in the scanning field of said electro-optical means upon detecting an article present at said inspection location.

3. An apparatus as defined in claim 1 wherein

said scanning means comprises a radiation beam device and means for deflection controlling the beam of said beam device to cause it to movably scan the image in its field,

said beam device being responsive to a signal generated by said detection means to initiate an inspection scanning operation.

4. An apparatus as defined in claim 1 wherein

said electro-optical scanning means is a television camera.

5. An automatic inspection apparatus comprising:

(a) means for supporting an object including a conveyor for conveying said object to an inspection work station to be inspected,

(b) radiation beam scanning means disposed at said inspection work station for examining objects to be inspected,

(c) said scanning means including receiving means for the radiation modulated in scanning a portion of the object which varies in physical characteristics and being operable for generating analog information signals that are representative of variations in the physical characteristics of the object under inspection,

(d) means for effecting relative movement between the object and said radiation beam scanning means, and

(e) automatic analyzing means operable for accepting the analog information signals generated by said receiving means,

(f) said automatic analyzing means including analyzing circuit means operable to analyze the information content of said analog information signals.

6. An automatic inspection apparatus as defined in claim 5 wherein:

said radiation beam scanning means is operable to effect scanning movement of its radiation beam across a select portion of said object during the scanning operation.

7. An automatic inspection apparatus as defined in claim 5 wherein:

said radiation beam scanning means is operable to generate and project a single read-beam against a select portion of the surface of said object,

said object being operable to variably modulate the energy of said beam thereby providing variable reflected energy to said scanning means,

said receiving means being effective for receiving said variable reflected energy,

said receiving means further being effective to generate said analog information signals which vary in accordance with variations in said variable reflected energy.