US4072856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Daylight-simulating incandescent lamp light fixture, particularly for medical and dental use
Assignee: WC Heraus GmbH and Co KG
•
Filing: 1977-01-25
•
Granted: 1978-02-07
•
Expires: 1997-01-25
Abstract
Abstract To permit employment of an incandescent lamp of about 3000° K color temperature as a light source, the reflector reflecting light to the use area, typically an operating table, a dental chair, or the like, is constructed of a material such as glass having an index of refraction of 1.425 to 1.575, the glass readily permitting passage of infrared radiation. To provide reflected light which corresponds at least approximately to daylight, with a color temperature of 6000° K., the glass is coated with a sequence of materials as set forth in table I, the materials being applied to the glass in the sequence given with increasing distance from the glass carrier, resulting in an overall reflected light of about 5500° K.
Inventors
- 👤 Hans Eligehausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:23
CPC Classifications
F; F21; F21V; F21V9/00; F21V9/04; F21V7/00; F21V7/22; F21V7/24; F21V7/28; F21W; F21W2131/00; F21W2131/20; F21W2131/202
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
Reflector structure to provide reflected light matching at least approximately daylight when illuminated by a source of radiation having a color temperature of about 3000° K, comprising a substrate carrier (8) of a material highly pervious to infrared radiation and having an index of refraction n d of between about 1.425 to 1.575; and a series of layers (9.1 - 9.6) applied to at least one side of said carrier substrate, in increasing distance from said substrate carrier, said layers comprising ______________________________________
Lay-
er Index
No. of Refraction
Thickness of Layer
Material
______________________________________
n.sub.d A
about about
9.1 about 1.9
to/2.1 about 1020
to/1120
tantalum, niobium
or
zirconium oxide
about about
9.2 about 1.4
to/1.5 about 665
to/735
silicon dioxide
or
magnesium
fluoride
about about
9.3 about 2.4
to/2.6 about 400
to/440
zinc sulfide
or
titanium oxide
about about
9.4 about 1.4
to/1.5 about 665
to/735
silicon dioxide
or
magnesium
fluoride
about about
9.5 about 2.4
to/2.6 about 400
to/440
titanium oxide
or
zinc sulfide
about about
9.6 about 1.4
to/1.6 about 1050
to/1155
silicon dioxide
or
magnesium
fluoride
______________________________________
Claim 2
Dependent Claim
180 words
Reflector structure to provide reflected light matching at least approximately daylight when illuminated by a source of radiation having a color temperature of about 3000° K, comprising a substrate carrier (8) of a material highly pervious to infrared radiation and having an index of refraction n d of between about 1.425 to 1.575; and a series of layers (9.1 - 9.6) applied to at least one side of said carrier substrate, in increasing distance from said substrate carrier, said layers comprising ______________________________________
Lay-
er Index
No. of Refraction
Thickness of Layer
Material
______________________________________
n.sub.d A
about about
9.1 about 1.9
to/2.1 about 1020
to/1120
tantalum, niobium
or
zirconium oxide
about about
9.2 about 1.4
to/1.5 about 665
to/735
silicon dioxide
or
magnesium
fluoride
about about
9.3 about 2.4
to/2.6 about 400
to/440
zinc sulfide
or
titanium oxide
about about
9.4 about 1.4
to/1.5 about 665
to/735
silicon dioxide
or
magnesium
fluoride
about about
9.5 about 2.4
to/2.6 about 400
to/440
titanium oxide
or
zinc sulfide
about about
9.6 about 1.4
to/1.6 about 1050
to/1155
silicon dioxide
or
magnesium
fluoride
______________________________________
Claim 3
Dependent Claim
13 words
Reflector structure according to claim 1, wherein the substrate carrier (8) comprises glass.
Claim 4
Dependent Claim
25 words
The reflector structure of claim 1 in combination with an incandescnet light source of 3000° K and located to be irradiated by said light source.
Claim 5
Dependent Claim
86 words
Daylight-simulating incandescent lamp fixture, particularly for medical and dental use, comprising an incandescent lamp emitting radiation having a color temperature of about 3000° K; a reflector structure (3) as claimed in claim 1; a reflecting shield (6) directing radiation from said incandescent lamp unto said reflector structure; and means (5) passing light reflected from said reflector structure, the reflecting shield (6) being located between said light-passing means and said reflector structure to prevent passage of direct radiation from said incandescent lamp through said light-passing means (5).
Claim 6
Dependent Claim
13 words
Fixture according to claim 4, wherein the reflecting shield (6) comprises a mirror.
Claim 7
Dependent Claim
42 words
Reflector structure according to claim 1, wherein the substrate carrier (8) comprises glass of about at least 10 7 A thickness and having an index of refraction n d of about 1.5, and the layers about as set forth in table II.
Claim 8
Dependent Claim
42 words
Light fixture according to claim 4, wherein the substrate carrier (8) comprises glass of about at least 10 7 A thickness and having an index of reflection n d of about 1.5, and the layers about as set forth in table II.
Claim 9
Dependent Claim
14 words
Light fixture according to claim 7, wherein the reflecting shield (6) comprises a mirror.
Claim 10
Dependent Claim
31 words
Light fixture according to claim 4, wherein said substrate (8) is glass, and said layers (9.1 - 9.6) are applied to the side of the substrate facing the incandescent lamp (2).
Claim 11
Dependent Claim
33 words
Light fixture according to claim 4, wherein said substrate (8) is glass and said layers (9.1 - 9.6) are applied to the side of the glass opposite that facing the incandescent lamp (2).
Claim 12
Dependent Claim
49 words
Light fixture according to claim 4, wherein said substrate (8) is glass and two sets of layers are provided, one layer being applied to the side of the glass facing the incandescent lamp (2) and the other layer being applied to the obverse side of the glass substrate (8).
Claim 13
Dependent Claim
37 words
The reflector structure of claim 1, wherein the first layer (9.1) is tantalum oxide; the second, fourth and sixth layer (9.2, 9.4, 9.6) are silicon dioxide; and the third and fifth layers (9.3, 9.5) are titanium dioxide.
Claim 14
Dependent Claim
37 words
Light fixture according to claim 4, wherein the first layer (9.1) is tantalum oxide; the second, fourth and sixth layers (9.2, 9.4, 9.6) are silicon dioxide; and the third and fifth layers (9.3, 9.5) are titanium dioxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |