Browse Prior Art Database

Compensation for Line End Distortion in Laser Phototracing

IP.com Disclosure Number: IPCOM000074365D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Kosanke, K: AUTHOR [+2]

Abstract

This electrooptic light modulator, when utilized with laser spot phototracing equipment for printed circuit generation, produces an intensity gradient in the transmitted light which is controllable in direction and magnitude to provide compensation for distortion effects at trace edges.

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

Compensation for Line End Distortion in Laser Phototracing

This electrooptic light modulator, when utilized with laser spot phototracing equipment for printed circuit generation, produces an intensity gradient in the transmitted light which is controllable in direction and magnitude to provide compensation for distortion effects at trace edges.

The modulator comprises a polarization rotator crystal S, an electrooptic crystal K (e.g. a KDP crystal) and an analyzer A. Linearly polarized light L received by the modulator has a lateral range spanning an edge ramp of the trace. The triangularly shaped electrodes of the crystal K permit establishment of an electric field gradient spanning the lateral range of the incident light beam. Consequently, by application of appropriate voltages V(S) and V(K) to respective elements S and K, a gradient of positional modulation is impressed upon the ordinary and extraordinary beams presented to analyzer A for output selection.

Thus, a distortional gradient of positional modulation in the received light can be cancelled by inverse modulation in the modulator.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]