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Optical comparator and inspection apparatus
| Details |
Inventors: Kempf, Paul S.;
Assignee:
Primary Examiner: Corbin; John K.
Assistant Examiner: Rosenberger; R.A.
Attorney, Agent or Firm: Brown & Martin
An optical comparator in which images of a master component and a sample component are inspected by comparison of the images that are projected in a moving, abutting, merging, mirror image, a limited area of the components being viewed in a scanning illumination at a controlled rate for full viewing coverage. The components are held in a sliding tray with means for rapidly changing the component to be inspected, whie maintaining precise alignment. A closely directed light source and efficient cooling device permits prolonged operation of the apparatus, and instant access to mark defective portions of the component is provided without interrupting viewing. The location of each defective portion is marked on a reference chart for use in a viewer which provides a composite image of the chart and component in proper registration for easy identification of the faults. |
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DETAILED DESCRIPTION In the apparatus described herein, a master component, such as a printed circuit board, and a similar component to be inspected, are carried in a frame in precise alignment for projection of their two images in adjacent relation, by an opaque projection system, on a large viewing screen.
The frame slides out of the projection unit for loading and unloading components, and has alignment adjusting means which maintains proper alignment of successive components.
A closely controlled lighting system provides a clear image of a narrow band of each component, the frame being moved forward or backward at a controlled rate to scan the components.
Controls for motion direction, speed and image focussing are provided at the operator's position.
The images thus move in synchronization and are positioned one above the other, so that similar portions of each component can be closely compared, a small area at a time.
An efficient cooling system permits prolonged operation of the apparatus and facilitates direct access to the component being checked for marking faulty elements.
The operator can reach through a trap door with a marking device and see the actual marking operation on the viewing screen, without the need to pull out the frame or disturb the component alignment, and the image display is so arranged that the marking operation does not interfere with the display.
A grid reference at the viewing screen permits location of faults on a chart assigned to the particular component.
After inspection, the component and its chart are placed in a viewer which superimposes the images, so that the faults are clearly located and identified.
The primary object of this invention, therefore, is to provide a new and improved optical comparator and inspection apparatus.
Another object of this invention is to provide a new and improved optical comparator apparatus in which large images of a master component and a component to be checked are projected in adjacent alignment and scanned over the components a small area at a time, at a controlled rate
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Image Analysis 
