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US5776219A
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Method of making a piece of glass for measuring transmittance
Assignee: Nikon Corp
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Filing: 1995-09-08
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Granted: 1998-07-07
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Expires: 2015-09-08
Abstract
Abstract In the measurement of internal transmittance of optical pieces, a standard is set for the piece for measuring the transmittance and a method of making the piece is provided. In the piece for measuring the transmittance of optical materials having two opposing polished surfaces, their surface roughness rms is set to 10 Å or less, thereby making it possible to accurately measure the internal transmittance in the short wavelength region of 300 nm or less where the intensity of the light source of spectrophotometer begins to decrease.
Inventors
- 👤 Hiroki Jinbo
- 👤 Satoru Oshikawa
- 👤 Hiroyuki Hiraiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:09
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/5907
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
A method of making a piece of glass for measuring transmittance, said method comprising the steps of: (a) polishing a first surface of a piece of silica glass with an abrasive agent including Ce until said first surface has a roughness of 100 angstroms or less: and (b) polishing said first surface of the piece with an abrasive agent made of SiO 2 until said first surface has a roughness of 10 angstroms or less and the amount of Ce on said first surface is 4×10 12 atoms/cm 2 or less, after step (a).
Claim 2
Independent Claim
94 words
A method of making a piece of glass for measuring transmittance, said method comprising the steps of: (a) polishing a first surface of a piece of silica glass with an abrasive agent including Ce until said first surface has a roughness of 100 angstroms or less: and (b) polishing said first surface of the piece with an abrasive agent made of SiO 2 until said first surface has a roughness of 10 angstroms or less and the amount of Ce on said first surface is 4×10 12 atoms/cm 2 or less, after step (a).
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein said abrasive agents in steps (a) and (b) are mixed with water when polishing, and the method further comprising the step of processing the piece with an alkaline solution.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein said piece is immersed in an aqueous fluoric acid solution after step (b).
Claim 5
Dependent Claim
27 words
A method according to claim 1, wherein said piece is immersed in an aqueous fluoric acid solution having a concentration of 5-20% by weight after step (b).
Claim 6
Dependent Claim
23 words
A method according to claim 1, further comprising, after step (b), the step of: immersing said piece in an aqueous nitric acid solution.
Claim 7
Dependent Claim
22 words
A method according to claim 1, further comprising, after step (b), the step of: immersing said piece in an aqueous ammonia solution.
Claim 8
Dependent Claim
28 words
A method according to claim 1, further comprising, after step (b), the step of: immersing said piece in an aqueous nitric acid solution having a normality of 0.01-0.05.
Claim 9
Dependent Claim
43 words
A method according to claim 1, further comprising, after step (b), the step of: (c) immersing said piece in an aqueous fluoric acid solution having a concentration of 5-20% by weight at a temperature of 15°-30° C. for 30 seconds to 1 minute.
Claim 10
Dependent Claim
38 words
A method according to claim 1, further comprising, after step (b), the step of: (d) immersing said piece in an aqueous nitric acid solution having a normality of 0.01-0.05 at a temperature of 15°-30° C. for 1-3 minutes.
Claim 11
Dependent Claim
37 words
A method according to claim 1, further comprising, after step (b), the step of: (e) immersing said piece in an aqueous ammonia solution having a normality of 0.01-0.05 at a temperature of 15°-30° C. for 1-3 minutes.
Claim 12
Dependent Claim
46 words
A method according to claim 1, wherein said piece is rectangular and said rectangular piece is dried after step (b), while said rectangular piece is supported in a holder which has an inner surface that can contact to only the four corners of said rectangular piece.
Claim 13
Dependent Claim
36 words
A method according to claim 10, wherein said piece is in a rectangular shape having four corners and said method further comprising, after step (e), the step of supporting said piece by said four corners alone.
Claim 14
Dependent Claim
16 words
A method according to claim 1, further comprising the step of measuring transmittance of said piece.
Claim 15
Independent Claim
94 words
A method of making a piece of glass for measuring transmittance, said method comprising the steps of: (a) polishing a first surface of a piece of silica glass with an abrasive agent including Ce until said first surface has a roughness of 100 angstroms or less; and (b) polishing said first surface of the piece with an abrasive agent made of SiO 2 until said first surface has a roughness of 10 angstroms or less and an angle between said first surface and its opposite surface is 30 seconds or less, after step (a).
Claim 16
Independent Claim
94 words
A method of making a piece of glass for measuring transmittance, said method comprising the steps of: (a) polishing a first surface of a piece of silica glass with an abrasive agent including Ce until said first surface has a roughness of 100 angstroms or less; and (b) polishing said first surface of the piece with an abrasive agent made of SiO 2 until said first surface has a roughness of 10 angstroms or less and an angle between said first surface and its opposite surface is 30 seconds or less, after step (a).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |