Browse Prior Art Database

Sliding Comparator Graticule Accessory

IP.com Disclosure Number: IPCOM000078571D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Ett, AH: AUTHOR

Abstract

This device provides for the direct measurement of optical patterns, where the required set of measurement scales and gauges exceeds the field of view of the comparator magnifier. It consists of an attachment of a sliding type graticule of a specific design to a comparator type optical instrument.

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Sliding Comparator Graticule Accessory

This device provides for the direct measurement of optical patterns, where the required set of measurement scales and gauges exceeds the field of view of the comparator magnifier. It consists of an attachment of a sliding type graticule of a specific design to a comparator type optical instrument.

The device illustrated in Figs. 1a through 1c consists of a rectangle of transparent plastic 2, such as PLEXIGLAS*, machined so as to provide a circular threaded opening 4, to permit insertion of one of several popular comparator magnifier bodies 12. The bottom surface of the plastic rectangle 2 is machined into a shallow dovetail, the depth of which is equal to the thickness of companion reticle slides 6. A threaded hole 8 contains a TEFLON** tipped setscrew 10 which is used to provide retaining Pressure to prevent inadvertent movement of the slide. A wide variety of different scale contents each designed for a specific set of optical measurements may be produced in this form.

One particular reticle design consists of markings in black on a clear transparent base 6. The reticle may be made by one of several photographic processes, or by photoengraving processes or by direct engraving or etching. The patterns used in this reticle design permit direct measurement of code bar parameters necessary to determine compliance with the USPS Bar Half-Bar encoding specification, for both USPS applied jet ink printing and preprinted mail encod...