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Microscope Attachment for Accurately Locating Angle and Track Location on a Magnetic Disk for Defect Data for Visual Inspection of Microscopic Coating Defects

IP.com Disclosure Number: IPCOM000046903D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Bornhorst, RJ: AUTHOR [+3]

Abstract

The attachment 10 for microscope 12 includes platen 14 for supporting magnetic disk 16, adjustment knob 18 for moving platen 14 and disk 16 radially through the center line of objective lens 12a of microscope 12 and linear potentiometer 20 cooperating with digital display voltmeter 22 for digitally indicating the radial position of disk 16 with respect to objective lens 12a of microscope 12. Disk 16 is rotatable about center support shaft 24 carried by support 25 that is, in turn, carried (indirectly) by base frame 26. Microscope 12 is mounted with respect to base frame 26 by movable support means 28 with adjustment knob 30 arranged to move objective lens 12a toward and away from the surface of disk 16 supported by platen 14 as knob 30 is rotated in one direction or the other.

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Microscope Attachment for Accurately Locating Angle and Track Location on a Magnetic Disk for Defect Data for Visual Inspection of Microscopic Coating Defects

The attachment 10 for microscope 12 includes platen 14 for supporting magnetic disk 16, adjustment knob 18 for moving platen 14 and disk 16 radially through the center line of objective lens 12a of microscope 12 and linear potentiometer 20 cooperating with digital display voltmeter 22 for digitally indicating the radial position of disk 16 with respect to objective lens 12a of microscope 12. Disk 16 is rotatable about center support shaft 24 carried by support 25 that is, in turn, carried (indirectly) by base frame 26. Microscope 12 is mounted with respect to base frame 26 by movable support means 28 with adjustment knob 30 arranged to move objective lens 12a toward and away from the surface of disk 16 supported by platen 14 as knob 30 is rotated in one direction or the other. Vacuum collet 32 is adapted to fit on top of disk 16 and platen 14 over a bottomed hole 34 provided in platen 14, and a flexible vacuum hose 36 is connected to collet 32 so that collet 32 may be firmly fixed with respect to platen 14 for fixing disk 16 on platen 14 by the application of vacuum to line 36. Platen 14 has degree markings "0", "15OE", "30OE", "45OE", "60OE", etc., on its outer edge, and these markings are adapted to align with pointer 37 mounted on carriage 40 so as to indicate the rotative position of platen 14. Platen 14 is provided with a marker hole 38, and disk 16 is provided with a corresponding index hole 39.

Disk 16 may be rotated on platen 14 initially so as to align holes 39 and 38 for the purpose of putting disk 16 in its proper rotative position on platen 14. Support 25 is mounted directly on carriage 40.

Carriage 40 is movably mounted on carriage 42, and carriage 42 is movably mounted on frame 26. The mounting of carriage 42 is by means of ways 45 allowing a rectilinear movement of carriage 42 with respect to frame 26, and carriage 40 is similarly mounted on carriage 42 by ways that extend at right angles with respect to the ways 45.

The ways 45 thus allow a movement of support 25, platen 14 and disk 16 in direction X, while the ways mounting carriage 40 on carriage 42 allow a rectilinear movement of these parts in direction Y at right angles to direction X. Knob 56 is connected by means of shaft 46 to pinion 48 that is in mesh with rack 50 provided on support 40.

Support 25, platen 14 and disk 16 may thus be moved in direction Y by rotatably adjusting knob 56. A similar pinion 52 in mesh with rack 54 provided on support 42 and adjusted by knob 18 are provided for moving supports 25 and 40, platen 14 and disk 16 in direction X along ways 45. Potentiometer 20 is effectively mounted between carriage 42 and frame 26 and thus provides a variable electrical resistance between the input lead 60 of voltmeter 22 and ground line 62 (Fig.
3). Battery 64 is connected between leads 66 and...