Patent US4468313A successfully refreshed from Google Patents.
US4468313A
Expired / Lapsed
US
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Sputtering target
Assignee: Toshiba Corp
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Filing: 1983-08-03
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Granted: 1984-08-28
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Expires: 2003-08-03
Abstract
Abstract A sputtering target comprises a backing plate, a mosaic layer laid on the backing plate, and a keep jig contacting the inner peripheral edge and outer peripheral edge of the mosaic layer, thus attaching the layer to the backing plate. The mosaic layer is substantially circular and consists of a first group of fan-shaped plates made of a first target material and a second group of fan-shaped plates of a second target material. The plates of the second group are divided into subgroups each consisting of at least one plate. These subgroups are interposed among the fan-shaped plates of the first group. The plates have a notch in the narrower end, are connected side by side to each other, and are arranged with top surfaces flush with one another.
Inventors
- 👤 Katsuya Okumura
- 👤 Masaaki Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:20
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/34; H01J37/3411; H01J37/3414; H01J37/3426; H01J37/3429; C; C23; C23C; C23C14/00; C23C14/22; C23C14/34; C23C14/3407; C23C14/3414
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
A sputtering target comprising: a backing plate; a mosaic layer laid on the backing plate, shaped substantially as a circle and having a central hole, said layer consisting of a first group of fan-shaped plates which are made of a first target material and a second group of fan-shaped plates which are made of a second target material, said second group being divided into subgroups each consisting of at least one plate and arranged among the fan-shaped plates of the first group, said fan-shaped plates having each a notch in the narrower end, connected side by side to each other, and arranged with top surfaces flush with one another; and a keep jig contacting the inner peripheral edge and outer peripheral edge of the mosaic layer, thereby attaching the mosaic layer to the backing plate.
Claim 2
Dependent Claim
135 words
A sputtering target comprising: a backing plate; a mosaic layer laid on the backing plate, shaped substantially as a circle and having a central hole, said layer consisting of a first group of fan-shaped plates which are made of a first target material and a second group of fan-shaped plates which are made of a second target material, said second group being divided into subgroups each consisting of at least one plate and arranged among the fan-shaped plates of the first group, said fan-shaped plates having each a notch in the narrower end, connected side by side to each other, and arranged with top surfaces flush with one another; and a keep jig contacting the inner peripheral edge and outer peripheral edge of the mosaic layer, thereby attaching the mosaic layer to the backing plate.
Claim 3
Dependent Claim
20 words
The sputtering target according to claim 1, wherein the open angle of each fan-shaped plate ranges from 3° to 30°.
Claim 4
Dependent Claim
19 words
The sputtering target according to claim 1 wherein the first and second target materials are silicon and molybdenum, respectively.
Claim 5
Dependent Claim
19 words
The sputtering target according to claim 1 wherein the first and second target materials are silicon and tungsten, respectively.
Claim 6
Dependent Claim
28 words
The sputtering target according to claim 1, wherein the plates contact each other along the side plane which is inclined to a perpendicular line on the backing plate.
Claim 7
Dependent Claim
36 words
The sputtering target according to claim 11 wherein the first and second target materials are silicon and molybdenum, respectively, and a conductive metal film is interposed between the plates of the first group and backing plate.
Claim 8
Dependent Claim
36 words
The sputtering target according to claim 11, wherein the first and second target materials are silicon and tungsten, respectively, and a conductive metal film is interposed between the plates of the first group and backing plate.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |