US4256778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inspecting and retouching a photo mask
Assignee: Hitachi Ltd
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Filing: 1978-07-18
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Granted: 1981-03-17
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Expires: 1998-07-18
Abstract
Abstract A method of treating a photo mask comprising preparing the photo mask which has a conductive transparent substance on a major surface of an insulating substrate and which is formed with a mask pattern of an opaque substance on the conductive transparent substance, and irradiating the mask with an electron beam to inspect and/or retouch said mask.
Inventors
- 👤 Koichiro Mizukami
- 👤 Masatoshi Migitaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:11
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/68; G03F1/72; G03F1/74; G03F1/82; G03F1/84; G03F1/86
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
86 words
A method of inspecting the mask pattern of a photo mask comprising the step of preparing the photo mask in which at least part of a major surface of a transparent substrate is formed of a conductive transparent substance and in which a plurality of opaque substance films constituting a mask pattern are disposed on said conductive transparent substance, and the step of irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential.
Claim 2
Independent Claim
86 words
A method of inspecting the mask pattern of a photo mask comprising the step of preparing the photo mask in which at least part of a major surface of a transparent substrate is formed of a conductive transparent substance and in which a plurality of opaque substance films constituting a mask pattern are disposed on said conductive transparent substance, and the step of irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential.
Claim 3
Independent Claim
105 words
A method of retouching the mask pattern of a photo mask comprising the step of preparing the photo mask which includes a transparent substrate, at least part of a major surface of said transparent substrate being formed of a conductive transparent substance, and a plurality of opaque substance films constituting a mask pattern and disposed on said conductive transparent substance, the step of inspecting any defect of said mask pattern by irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential, and the step of retouching the defect of said mask pattern.
Claim 4
Independent Claim
105 words
A method of retouching the mask pattern of a photo mask comprising the step of preparing the photo mask which includes a transparent substrate, at least part of a major surface of said transparent substrate being formed of a conductive transparent substance, and a plurality of opaque substance films constituting a mask pattern and disposed on said conductive transparent substance, the step of inspecting any defect of said mask pattern by irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential, and the step of retouching the defect of said mask pattern.
Claim 5
Dependent Claim
42 words
The method of claim 1 wherein said conductive transparent substance is extended continuously from said major surface of said substrate on which said mask pattern is formed to the surface opposite of said major surface through the side surfaces of said substrate.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein said conductive transparent substance is extended continuously from said major surface of said substrate on which said mask pattern is formed to the side surfaces.
Claim 7
Dependent Claim
44 words
The method of claim 1 wherein said conductive transparent substance is extended continuously from said major surface of said substrate on which said mask pattern is formed to a part of the surface opposite said major surface through the side surfaces of said substrate.
Claim 8
Independent Claim
84 words
A method of inspecting the mask pattern of a photomask comprising the step of preparing the photo mask in which a plurality of opaque substance films constituting a mask pattern are disposed on said substrate and a transparent substrate formed of a conductive transparent substance is disposed on said substrate and said plurality of opaque substance films, and the step of irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential.
Claim 9
Independent Claim
84 words
A method of inspecting the mask pattern of a photomask comprising the step of preparing the photo mask in which a plurality of opaque substance films constituting a mask pattern are disposed on said substrate and a transparent substrate formed of a conductive transparent substance is disposed on said substrate and said plurality of opaque substance films, and the step of irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential.
Claim 10
Independent Claim
81 words
A method of inspecting the mask pattern of a photo mask comprising the step of preparing the photo mask in which a plurality of opaque substance films constituting a mask pattern are disposed on the major surface of a substrate made up of a transparent and a conductive substance, and the step of irradiating said photo mask with an electron beam under a state under which said substrate made of a transparent and conductive substance is held at a predetermined potential.
Claim 11
Independent Claim
81 words
A method of inspecting the mask pattern of a photo mask comprising the step of preparing the photo mask in which a plurality of opaque substance films constituting a mask pattern are disposed on the major surface of a substrate made up of a transparent and a conductive substance, and the step of irradiating said photo mask with an electron beam under a state under which said substrate made of a transparent and conductive substance is held at a predetermined potential.
Claim 12
Independent Claim
160 words
A method of retouching a photo mask comprising the step of preparing the photo mask which includes a transparent substrate, at least part of a major surface of said transparent substrate, being formed of a conductive transparent substance, and a plurality of opaque substance films constituting a mask pattern and disposed on said conductive transparent substance, the step of inspecting any defect of said mask pattern by irradiating said photo mask with an electron beam under a state during which said conductive transparent substance is held at a predetermined potential, the step of applying a photoresist material onto the mask pattern, the step of partially subjecting said photoresist material to spot exposure, to expose the surface of the defective part of said mask pattern, and the step of partially retouching the defect of said mask pattern by irradiating said photo mask with an electron beam under a state during which said conductive transparent substance is held at a predetermined potential.
Claim 13
Independent Claim
160 words
A method of retouching a photo mask comprising the step of preparing the photo mask which includes a transparent substrate, at least part of a major surface of said transparent substrate, being formed of a conductive transparent substance, and a plurality of opaque substance films constituting a mask pattern and disposed on said conductive transparent substance, the step of inspecting any defect of said mask pattern by irradiating said photo mask with an electron beam under a state during which said conductive transparent substance is held at a predetermined potential, the step of applying a photoresist material onto the mask pattern, the step of partially subjecting said photoresist material to spot exposure, to expose the surface of the defective part of said mask pattern, and the step of partially retouching the defect of said mask pattern by irradiating said photo mask with an electron beam under a state during which said conductive transparent substance is held at a predetermined potential.
Claim 14
Independent Claim
101 words
A method of retouching a photo mask comprising the step of preparing the photo mask which includes a transparent substrate, at least part of a major surface of said transparent substrate being formed of a conductive transparent substance, and a plurality of opaque substance films constituting a mask pattern and disposed on said conductive transparent substance, the step of inspecting any defect of said mask pattern by irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential, and the step of retouching the defect of said mask pattern.
Claim 15
Independent Claim
101 words
A method of retouching a photo mask comprising the step of preparing the photo mask which includes a transparent substrate, at least part of a major surface of said transparent substrate being formed of a conductive transparent substance, and a plurality of opaque substance films constituting a mask pattern and disposed on said conductive transparent substance, the step of inspecting any defect of said mask pattern by irradiating said photo mask with an electron beam under a state under which said conductive transparent substance is held at a predetermined potential, and the step of retouching the defect of said mask pattern.
Claim 16
Independent Claim
68 words
A method of treating the mask pattern of a photo mask comprising the steps of: (a) irradiating said photomask which has a transparent substance in at least part of a major surface of said transparent substance with an electron beam while said conductive transparent substance is held at a predetermined potential; (b) scanning said electron beam across at least part of a major surface of said photo mask.
Claim 17
Independent Claim
68 words
A method of treating the mask pattern of a photo mask comprising the steps of: (a) irradiating said photomask which has a transparent substance in at least part of a major surface of said transparent substance with an electron beam while said conductive transparent substance is held at a predetermined potential; (b) scanning said electron beam across at least part of a major surface of said photo mask.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |