US4886975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface examining apparatus for detecting the presence of foreign particles on two or more surfaces
Assignee: Canon Inc
•
Filing: 1989-05-02
•
Granted: 1989-12-12
•
Expires: 2009-05-02
Abstract
Abstract An apparatus usable with an object having surfaces, for examining the states of the surfaces, includes on irradiating system for irradiating the surfaces of the object with a single light beam, and a plurality of light-receiving systems provided in association with the surfaces of the object, respectively, the plural light-receiving systems being arranged to receive light scatteringly reflected from the surfaces of the object, respectively, and to produce outputs corresponding to the states of the surfaces of the object, respectively.
Inventors
- 👤 Eiichi Murakami
- 👤 Michio Kohno
- 👤 Akiyoshi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:29
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/94; G01N21/17; G01N21/47; G01N2021/4704; G01N2021/4711; G01N2021/4719; G01N21/95; G01N21/956; G01N2021/95676
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
A surface examining apparatus for examining a first surface and a second surface of an article, said apparatus comprising: scanning means for scanning said first surface with a first light and, simultaneously therewith, for scanning said second surface with a second light; first light-receiving means for receiving the light scattered from a first portion of said first surface being scanned with the first light, thereby to examine said first portion of said first surface; and second light-receiving means for receiving the light scattered from a second portion of said second surface being scanned with the second light, thereby to examine said second portion of said second surface, wherein said second light-receiving means includes an optical element having an optical axis and wherein the first light passing through said first surface toward said second surface does not intersect said optical axis of said optical element, in a range between said first and second surfaces.
Claim 2
Dependent Claim
153 words
A surface examining apparatus for examining a first surface and a second surface of an article, said apparatus comprising: scanning means for scanning said first surface with a first light and, simultaneously therewith, for scanning said second surface with a second light; first light-receiving means for receiving the light scattered from a first portion of said first surface being scanned with the first light, thereby to examine said first portion of said first surface; and second light-receiving means for receiving the light scattered from a second portion of said second surface being scanned with the second light, thereby to examine said second portion of said second surface, wherein said second light-receiving means includes an optical element having an optical axis and wherein the first light passing through said first surface toward said second surface does not intersect said optical axis of said optical element, in a range between said first and second surfaces.
Claim 3
Dependent Claim
42 words
An apparatus according to claim 1, wherein the optical axis of said second light-receiving means extends in a direction that intersects the direction of projection of the first light at a location which is not interposed between the first and second surfaces.
Claim 4
Dependent Claim
59 words
An apparatus according to claim 1, wherein the article comprises (i) a reticle having a pattern for manufacture of a microcircuit and (ii) a pellicle protection film for protecting the reticle, and wherein said scanning means scans a surface of the reticle and a surface of the pellicle protection film with said first light and said second light, respectively.
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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |