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US4979802A
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US
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Synthetic resin half-mirror
Assignee: Olympus Corp
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Filing: 1990-02-28
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Granted: 1990-12-25
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Expires: 2010-02-28
Abstract
Abstract A synthetic resin half-mirror comprises a synthetic resin substrate, a first SiO film layer deposited thereon, and further at least two SiO2 layers and CeO2 film layers alternately deposited thereon and satisfies a spectral reflectance at incident angle of 45 DEG of not less than 40% as an optical property.
Inventors
- 👤 Hajime Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:51
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/0816; G02B5/0825; G02B5/0833; C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; G02B1/00; G02B1/10; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
A synthetic resin half-mirror comprising a substrate made from a synthetic resin, a first film layer laminated thereon and made from SiO and at least four film layers laminated on the first film layer and alternately made from SiO 2 and CeO 2 .
Claim 2
Dependent Claim
44 words
A synthetic resin half-mirror comprising a substrate made from a synthetic resin, a first film layer laminated thereon and made from SiO and at least four film layers laminated on the first film layer and alternately made from SiO 2 and CeO 2 .
Claim 3
Dependent Claim
34 words
The synthetic resin half-mirror according to claim 1, wherein said first film layer of SiO has an optical thickness of nd=λ/12˜λ/2 and adjoining film layer of SiO 2 has an optical thickness of nd=λ/8˜λ/4.
Claim 4
Dependent Claim
91 words
A synthetic resin half-mirror comprising: a substrate composed of synthetic resin; a first film layer laminated on the substrate and composed of SiO; and at least four film layers successively laminated on the first film layer and on one another, the at least four film layers being alternately composed of SiO 2 and CeO 2 , the lowermost film layer which is laminated on the first film layer being composed of SiO 2 and the uppermost film layer being composed of CeO 2 and defining the incident-light surface of the half-mirror.
Claim 5
Dependent Claim
91 words
A synthetic resin half-mirror comprising: a substrate composed of synthetic resin; a first film layer laminated on the substrate and composed of SiO; and at least four film layers successively laminated on the first film layer and on one another, the at least four film layers being alternately composed of SiO 2 and CeO 2 , the lowermost film layer which is laminated on the first film layer being composed of SiO 2 and the uppermost film layer being composed of CeO 2 and defining the incident-light surface of the half-mirror.
Claim 6
Dependent Claim
20 words
A synthetic resin half-mirror according to claim 3; wherein the at least four film layers consist of four film layers.
Claim 7
Dependent Claim
41 words
A synthetic resin half-mirror according to claim 4; wherein the first film layer composed of SiO has an optical thickness in the range nd=λ/12-λ/2, and the lowermost film layer composed of SiO 2 has an optical thickness in the range nd=λ/8-λ/4.
Claim 8
Dependent Claim
27 words
A synthetic resin half-mirror according to claim 5; wherein the four film layers alternately composed of SiO 2 and CeO 2 each have an optical thickness nd=λ/4.
Claim 9
Dependent Claim
20 words
A synthetic resin half-mirror according to claim 3; wherein the at least four film layers consist of six film layers.
Claim 10
Dependent Claim
41 words
A synthetic resin half-mirror according to claim 7; wherein the first film layer composed of SiO has an optical thickness in the range nd=λ/12-λ/2, and the lowermost film layer composed of SiO 2 has an optical thickness in the range nd=λ/8-λ/4.
Claim 11
Dependent Claim
27 words
A synthetic resin half-mirror according to claim 8; wherein the six film layers alternately composed of SiO 2 and CeO 2 each have an optical thickness nd=λ/4.
Claim 12
Dependent Claim
42 words
A synthetic resin half-mirror according to claim 3; wherein the first film layer composed of SiO has an optical thickness in the range nd-32 λ/12-λ/2, and the lowermost film layer composed of SiO 2 has an optical thickness in the range nd=λ/8-λ/4.
Claim 13
Dependent Claim
29 words
A synthetic resin half-mirror according to claim 10; wherein the at least four film layers alternately composed of SiO 2 and CeO 2 each have an optical thickness nd=λ/4.
Claim 14
Dependent Claim
34 words
A synthetic resin half-mirror according to claim 3; wherein the film layers exhibit a spectral reflectance of not less than 40% for light incident on the incident-light surface at an incident angle of 45°.
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) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |