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US4260219A Expired / Lapsed US ⏱️ 0.0 years remaining

Device for collecting light and method of manufacturing such device

Assignee: Siemens AG
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Filing: 1979-08-01
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Granted: 1981-04-07
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Expires: 1999-08-01
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Abstract

Abstract A light-collecting device in the form of, for example, a rectangularly-shaped body having a so-called "fluorescent plate" with at least one light-exit window is comprised of a solid polymerized synthetic carrier material, such as a polyacrylate, a polymethacrylate, polystyrene or copolymer of a methacrylate and a styrene containing fluorescing particles therein which have finite dipole moments with different values in the basic and in the excited state and containing an amphiphilic additive, such as an ionoic or non-ionoic or polymeric soap, with such amphiphilic additive being colloidally dissolved in the synthetic carrier in such a manner that the fluorescing particles are each surrounded by one of the colloid particles and an environment with an orientation polarization is attained whereby the environment can re-orientate so quickly that it achieves its thermodynamic equilibrium substantially completely during the existence of the excited state in the fluorescing particles and tends to suppress the disruptive self-absorption of a light within the fluorescent plate. Such self-absorption originates from a partial overlap of the emission spectrum with the absorption spectrum of the fluorescing particles. In certain embodiments of the invention, an additional polar solvent for the fluorescing particles is also enclosed in the colloid particles. The amphiphilic additive and/or polar solvents can be admixed in the synthetic carrier material and the so-attained system can be cast into a desired body form. The disclosed device is useful as a solar collector, an optical indicia transmitter of an image brightener for passive displays.

Inventors

  • 👤 Waldemar Greubel
  • 👤 Ferdinand Quella

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 06:38
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/40; H10F77/42; H10F77/45; C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; F; F21; F21K; F21K2/00; G; G01; G01J; G01J1/00; G01J1/58; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/52; Y10; Y10S; Y10S385/00; Y10S385/902

Claims Analysis

Total Claims: 23
Claim 1
Independent Claim 134 words
A device for collecting light comprised of a body functioning as a light trap and having at least one light exit window, said body being comprised of a solid synthetic carrier material having an index of refraction greater than one and containing therein substantially uniformly dispersed fluorescent particles which have finite dipole moments with different values in the basic state and in the excited state of said particles and an amount of at least one amphiphilic additive colloidally dissolved in said synthetic carrier material in such a manner that each fluorescent particle is enclosed by a colloidal particle and are positioned in an environment with an orientation polarization whereby the environment can re-orientate so quickly that it achieves its thermodynamic equilibrium substantially completely during the existence of the excited state in the fluorescent particle.
Claim 2
Independent Claim 134 words
A device for collecting light comprised of a body functioning as a light trap and having at least one light exit window, said body being comprised of a solid synthetic carrier material having an index of refraction greater than one and containing therein substantially uniformly dispersed fluorescent particles which have finite dipole moments with different values in the basic state and in the excited state of said particles and an amount of at least one amphiphilic additive colloidally dissolved in said synthetic carrier material in such a manner that each fluorescent particle is enclosed by a colloidal particle and are positioned in an environment with an orientation polarization whereby the environment can re-orientate so quickly that it achieves its thermodynamic equilibrium substantially completely during the existence of the excited state in the fluorescent particle.
Claim 3
Dependent Claim 15 words
A device as defined in claim 1 wherein said amphiphilic additive is a polar material.
Claim 4
Dependent Claim 28 words
A device as defined in claim 1 wherein said amphiphilic additive is a soap selected from the group consisting of an ionic, a non-ionic and a polymeric soap.
Claim 5
Dependent Claim 14 words
A device as defined in claim 3 wherein said soap is polyethylene sorbitan monolaurate.
Claim 6
Dependent Claim 24 words
A device as defined in claim 3 wherein said soap is selected from the group consisting of polyvinyl pyrrolidone, polymethacrylic acid and salts thereof.
Claim 7
Dependent Claim 22 words
A device as defined in claim 1 wherein a polar solvent for the fluorescent particles is enclosed in the individual colloid particles.
Claim 8
Dependent Claim 17 words
A device as defined in claim 6 wherein said polar solvent is a relatively high boiling alcohol.
Claim 9
Dependent Claim 14 words
In a device as defined in claim 7 wherein said alcohol is a glycol.
Claim 10
Dependent Claim 27 words
In a device as defined in claim 1 wherein said synthetic carrier material is selected from the group consisting of a polyacrylate, a polymethacrylate and a polystrene.
Claim 11
Dependent Claim 24 words
A device as defined in claim 1 wherein said synthetic carrier material is a copolymer with a methacrylate and a styrene as main components.
Claim 12
Dependent Claim 17 words
A device as defined in claim 1 wherein said synthetic carrier material includes a non-oxidizing polymerization initiator.
Claim 13
Dependent Claim 14 words
A device as defined in claim 11 wherein said initiator is a tetraphenyl ethane.
Claim 14
Dependent Claim 13 words
A device as defined in claim 12 wherein said tetraphenyl ethane is benzopinacol.
Claim 15
Dependent Claim 38 words
A device as defined in claim 1 wherein the amount of amphiphilic additive in the synthetic carrier material ranges between about 1 and 10 weight % on the basis of the total weight of the entire fluorescent body.
Claim 16
Dependent Claim 40 words
A device as defined in claim 6 wherein the amount of additive and polar solvent in the synthetic carrier material ranges between about 1 and 10 weight % on the basis of the total weight of the entire fluorescent body.
Claim 17
Dependent Claim 52 words
The device of claim 1 manufactured by a process wherein said fluorescent particles, which are dissolved in a polar solvent, and the amphiphilic additives are mixed with a select synthetic carrier material existing in liquid form and then the resultant material mixture is brought into a desired final body shape and stabilized.
Claim 18
Dependent Claim 19 words
The device as defined in claim 16 wherein said synthetic carrier material existing in liquid form is a monomer.
Claim 19
Dependent Claim 20 words
The device as defined in claim 16 wherein said synthetic carrier material existing in liquid form is a uncross-linked polymer.
Claim 20
Dependent Claim 20 words
The device as defined in claim 16 wherein said synthetic carrier material existing in liquid form is a pre-polymerized material.
Claim 21
Dependent Claim 34 words
The device as defined in claim 16 wherein the material mixture is brought into a desired final body shape via casting and is stabilized via a polymerization reaction initiated by a non-oxidizing polymerization initiator.
Claim 22
Dependent Claim 33 words
The device as defined in claim 16 wherein the material mixture is brought into a desired final body shape via casting and is stabilized via cross-linkage reaction initiated by a non-oxidizing cross-linking initiator.
Claim 23
Dependent Claim 14 words
A device as defined in claim 1 wherein said synthetic carrier material is polymerized.

References Cited (Backward Citations)

DE2554226A1 Cited
DE2620115A1 Cited
DE2724748A1 Cited
DE2742899C3 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-04-06 1984-10-06 1985-04-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-04-06 1988-10-06 1989-04-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-04-06 1992-10-06 1993-04-07 $7700.00 Window Closed / Lapsed

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