Inspection system for circuit patterns and a method thereof

• US 6,831,998 B1
• Filed: 06/22/2000
• Issued: 12/14/2004
• Est. Priority Date: 06/22/2000
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Doi, Hideaki, Kobayashi, Haruomi, Shishido, Chie, Yoshimura, Kazushi, Isobe, Mitsunobu, Koshishiba, Hiroya
• Primary Examiner(s): Mehta, Bhavesh M.
• Assistant Examiner(s): CHAWAN, SHEELA C
• Application Number:
  US09/598,652
• Time in Patent Office: 1,636 Days
• Field of Search: 382/149, 382/312, 382/318, 382/324, 382/304, 382/305, 382/147, 250/540, 250/548, 250/310, 250/307, 356/369, 356/364, 356/237.1, 356/237.4, 361/719, 361/722, 361/807
• US Class Current: 382/147
• CPC Class Codes: G06T 2207/30141 Printed circuit board [PCB]
• CPC Class Codes: G06T 7/0004 Industrial image inspection
• CPC Class Codes: G06V 10/94 Hardware or software architectures specially adapted for image or video understanding

Abstract

In order to provide a high-speed, inexpensive inspection system that has a short development period, that is flexible, and that allow algorithms to be easily changed, a PC equipped with an image input feature is used to capture an image detected by a line image sensor, this detected image is transferred to a plurality of PCs connected by a LAN, and defects are detected using software processing on the plurality of PCs.

Claims

1. An inspection system comprising:

a stage which mounts an object to be inspected and moves in a plane;

an image detecting means for detecting an image of said object mounted on said stage successively moving in a plane and successively outputting an image signal;

an image signal receiving means for receiving said image signal successively outputted from said image detecting means and outputting said received image signal;

an image processing means which includes a plurality of image processing units which receive successive portions of said outputted image signal from said image signal receiving means, and process said received outputted image signal to detect defects in said object in parallel; and

a data unifying means for unifying data which is processed by said image processing means in parallel,

wherein said image receiving means outputs said received image signal by selectively distributing said successive portions of said received image signal to said plurality of image processing units of said image processing means.

2. An inspection system as described in claim 1 wherein said plurality of image processing units are formed from general-purpose PCs.

3. An inspection system as described in claim 1 wherein said image detecting means sends out an image signal as a multi-channel output, and said image signal receiving means includes a feature to receive multi-channel image signals.

4. An inspection system as described in claim 1 wherein said image detecting means has a line image sensor of the TDI (Time Delay &

Integration) type that detects images of said inspected object.

5. An inspection system as described in claim 1 wherein said plurality of image processing units are connected to said image signal receiving means via a communication network.

6. An inspection system as described in claim 1 wherein said image detecting means detects an optical image of said inspected object.

7. An inspection system as described in claim 1 wherein said image detecting means captures a two-dimensional electron image of said inspected object.

8. An inspection system as described in claim 1 wherein said stage moves said object when said image detecting means is detecting images of said object.