Browse Prior Art Database

Optical Image Switching Device

IP.com Disclosure Number: IPCOM000074507D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Culver, JV: AUTHOR

Abstract

Shown is an optical system for comparing an object such as a semiconductor device with a reference. The drawing illustrates the eye pieces 2 and objectives 3 and 4 of a standard stereo microscope. A semitransparent mirror 5 and a mirror 6 provide the separate optical paths indicated y dashed lines to the object and the reference. A shutter is positioned in each of the two optical paths. The shutters are responsive to an electrical signal applied on lines 7 and 8 and are available under the trademark VARAD. A shutter control supplies opposite phase voltages on lines 7 and 8 to turn the shutters on and off alternately. If the object and reference are identical, a viewer sees a fixed image. Differences between the object and the reference produce a flicker that is readily noticeable.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Optical Image Switching Device

Shown is an optical system for comparing an object such as a semiconductor device with a reference. The drawing illustrates the eye pieces 2 and objectives 3 and 4 of a standard stereo microscope. A semitransparent mirror 5 and a mirror 6 provide the separate optical paths indicated y dashed lines to the object and the reference. A shutter is positioned in each of the two optical paths.

The shutters are responsive to an electrical signal applied on lines 7 and 8 and are available under the trademark VARAD. A shutter control supplies opposite phase voltages on lines 7 and 8 to turn the shutters on and off alternately. If the object and reference are identical, a viewer sees a fixed image. Differences between the object and the reference produce a flicker that is readily noticeable.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]