US4293375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a device and device manufactured according to the method
Assignee: US Philips Corp
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Filing: 1979-06-13
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Granted: 1981-10-06
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Expires: 1999-06-13
Abstract
Abstract The invention relates to a method of plasma etching a body in which a surface of the body is covered with a photolacquer mask. According to the invention the method is characterized in that the photolacquer mask to be provided exceeds the desired dimensions of the etching pattern to be formed and furthermore that the method is carried out so that the photolacquer mask is etched more rapidly than the body. An etching profile having inclined sides is obtained.
Inventors
- 👤 Hans-Rudolf Neukomm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:54
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/20; H10P50/28; H10P50/282; H10P50/283; G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3163; H10P50/26; H10P50/262; H10P50/263; H10P50/73
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A method of manufacturing a device with etch patterns of predetermined dimensions comprising providing a body including an underlying substrate and a surface layer having a thickness D, covering portions of said surface layer with a photolacquer mask having a thickness d, said covered portions having dimensions exceeding predetermined etch pattern dimensions by a uniform width b, plasma etching uncovered portions of said surface layer and said photolacquer mask to obtain said predetermined pattern of dimensions at said underlying substrate by laterally etching said photolacquer mask at a faster rate than said surface layer, thereby obtaining an etch profile with an inclined side having an angle α with said underlying substrate, wherein said uniform width b is at least equal to D tan α, and said thickness d is at least equal to 2D/sin 2α.
Claim 2
Independent Claim
135 words
A method of manufacturing a device with etch patterns of predetermined dimensions comprising providing a body including an underlying substrate and a surface layer having a thickness D, covering portions of said surface layer with a photolacquer mask having a thickness d, said covered portions having dimensions exceeding predetermined etch pattern dimensions by a uniform width b, plasma etching uncovered portions of said surface layer and said photolacquer mask to obtain said predetermined pattern of dimensions at said underlying substrate by laterally etching said photolacquer mask at a faster rate than said surface layer, thereby obtaining an etch profile with an inclined side having an angle α with said underlying substrate, wherein said uniform width b is at least equal to D tan α, and said thickness d is at least equal to 2D/sin 2α.
Claim 3
Dependent Claim
23 words
A method according to claim 1, wherein any remaining photolacquer mask after said etching step is removed by dissolving under changed reaction conditions.
Claim 4
Dependent Claim
52 words
A method according to claim 1, wherein said plasma etching step is carried out in a gas atmosphere of oxygen and a halogen, and relative etching rates of said photolacquer mask and said surface layer are controlled by changing the ratio of concentrations of said oxygen and halogen in said gas atmosphere.
Claim 5
Dependent Claim
26 words
A method according to claim 1, wherein relative etching rates of said photolacquer mask and said surface layer are controlled by varying temperature of the plasma.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |