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Laser Monitor for Producing Satin Finish on Glass

IP.com Disclosure Number: IPCOM000043583D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Perry, CH: AUTHOR [+2]

Abstract

Satin finish anti-glare is produced on the front surface of a plasma display device by a two-step process. First, the front surface of the panel is lapped to produce a frosted appearance having a surface roughness (Ra) of 12-15 microinches. Then the frosted surface is polished to produce a smoother finish (4 to 6 microinches, Ra) that is similar in appearance to satin varnish. The polishing operation is difficult to reproduce consistently, however, because it is a non-equilibrium process. A laser can be used to constantly monitor the surface finish of the glass during the polishing operations, as shown in the figure. A He-Ne laser 11 having a beam diameter 13 not greater than 1 mm is applied to the edge 15 of the front substrate glass 17 at an angle of 20Πto 30Πwith respect to the polishing table surface.

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Laser Monitor for Producing Satin Finish on Glass

Satin finish anti-glare is produced on the front surface of a plasma display device by a two-step process. First, the front surface of the panel is lapped to produce a frosted appearance having a surface roughness (Ra) of 12-15 microinches. Then the frosted surface is polished to produce a smoother finish (4 to 6 microinches, Ra) that is similar in appearance to satin varnish. The polishing operation is difficult to reproduce consistently, however, because it is a non-equilibrium process. A laser can be used to constantly monitor the surface finish of the glass during the polishing operations, as shown in the figure. A He- Ne laser 11 having a beam diameter 13 not greater than 1 mm is applied to the edge 15 of the front substrate glass 17 at an angle of 20OE to 30OE with respect to the polishing table surface. The laser light is diffusely reflected from the front surface of the substrate glass 17 and monitored by a photodiode 19, as shown in the figure. The amount of diffuse laser light reaching photodiode 19 is directly proportional to the surface roughness 15 of the glass. Therefore, the polishing operation using polishing wheel 21 can be monitored via the voltage from the photodiode, thus allowing consistent results on all plasma display devices.

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