1. A hearing aid device comprising,
a hearing aid housing;
an audio connection at said hearing aid housing configured for connection to an external device exhibiting an external device load at said audio connector,
a voltage supply in said hearing aid housing; and
a load detection and control device connected in said hearing aid housing between said voltage supply and said audio connector, for detecting said external device load at said audio connector and for automatically controlling a supply of voltage from said voltage supply to said audio connector dependent on the detected external device load.
2. A hearing aid device as claimed in claim 1 wherein said voltage supply comprises a regulated voltage source and unregulated voltage source.
3. A hearing aid device as claimed in claim 2 wherein said load detection and control device switches one of said regulated voltage source or said unregulated voltage source to said audio connector dependent on the detected external device load.
4. A hearing aid device as claimed in claim 3 wherein said load detection and control device comprises a current measurement circuit for measuring a current at said audio connector, and a comparator for comparing said measured current with a switching threshold for switching between said regulated voltage source and said unregulated voltage source.
5. A hearing aid deuce as claimed in claim 3 wherein said load detection and control device comprises a voltage monitoring circuit for measuring a current at said audio connector, and a comparator for comparing said monitored voltage with a switching threshold for switching between said regulated voltage source and said unregulated voltage source.
6. A method for operating a combination of a hearing aid device and an external device, comprising the steps of:
electrically connecting an external device to a hearing aid device;
supplying said external device with voltage from a voltage source in said hearing aid device;
detecting an electrical load that said external device produces on said voltage supply, and
automatically electronically controlling supply of said voltage from said voltage supply to said external device dependent on the detected electrical load.
7. A method as claimed in claim 6 composing supplying either regulated voltage or unregulated voltage from said voltage supply dependent on sold detected electrical load.
8. A method as claimed in claim 7 wherein said voltage supply comprises a regulated voltage source and an unregulated voltage source, and comprising switching between said regulated voltage source and said unregulated voltage source dependent on the detected electrical load.
9. A method as claimed in claim 8 comprising detecting said electrical load by measuring current consumed by said external device and comparing the measured current to a switching threshold for switching between said unregulated voltage source and said regulated voltage source.
10. A method as claimed in claim 8 comprising detecting said electrical load by monitoring voltage consumed by said external device and comparing the monitored voltage to a switching threshold for switching between said unregulated voltage source and said regulated voltage source.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A polyurethane composition comprising
A) one or more iminooxadiazinedione-group-containing polyisocyanates,
B) one or more polyfunctional, isocyanate-reactive compounds,
C) one or more compounds having groups which react on exposure to actinic radiation with ethylenically unsaturated compounds with polymerization (radiation-curing groups),
D) optionally one or more free radical stabilizers and
E) one or more photoinitiators.
2. A polyurethane composition according to claim 1, wherein at least 60% by weight of the polyisocyanates of component A) are based on aliphatic andor cycloaliphatic di- andor triisocyanates.
3. A polyurethane composition according to claim 1, wherein one or more compounds of the group consisting of 9-vinylcarbazole, vinylnaphthalene, bisphenol A diacrylate, tetrabromobisphenol A diacrylate, 1,4-bis(2-thionaphthyl)-2-butyl acrylate, pentabromophenyl acrylate, naphthyl acrylate and propane-2,2-diylbis(2,6-dibromo-4,1-phenylene)oxy(2-{3,3,3-tris(4-chlorophenyl)propanoyloxy}propane-3,1-diyl)oxyethane-2,1-diyldiacrylate are used in C).
4. A polyurethane composition according to claim 1, wherein the molar ratio of NCO to OH groups therein is from 0.90 to 1.25.
5. A polymeric plastic prepared from the polyurethane composition according to claim 1.
6. A polymeric plastic according to claim 5, wherein the polymeric plastic is a layer or molding.
7. A polymeric plastic according to claim 5, wherein the polymeric plastic has a glass transition temperature of less than \u221240\xb0 C.
8. Holographic media comprising a polyurethane composition according to claim 1.
9. Holographic media comprising at least one polymeric plastic according to claim 5.