Optical compensation element
View Patent ↗The invention relates to an optical compensation element comprising a first transparent surface on which a transparent electrode is arranged; a second transparent surface on which a plurality of transparent main electrodes are arranged, several of which being respectively connected to control electrodes via a transverse electrode; and a material having a refractive index which changes according to the voltage applied, said material being arranged between the first and second transparent surfaces. The aim of the invention is to improve said compensation element. To this end, each main electrode is connected to a transverse electrode at a precise location.
1. An optical compensation element having:
a first transparent surface on which a transparent electrode is fit,
a second transparent surface on which a plurality of transparent main electrodes are arranged, which are connected at one point, and only at one point, to a transverse electrode and, via this, to drive electrodes,
a material which changes its refractive index as a function of the applied voltage and is arranged between the first and second transparent surface,
wherein two or more main electrodes are in each case connected directly to one transverse electrode, and wherein the main electrodes are in the form of virtually closed rings with different radii, and are connected to the transverse electrode on the side opposite the opening.
2. The optical compensation element as claimed in claim 1 , wherein the transverse electrode and the drive electrode are composed of the same material, with the transverse electrode cross section being smaller than the main electrode cross section.
3. The optical compensation element as claimed in claim 1 , wherein at least one correction electrode is arranged between the main electrodes and can be driven by means of a further drive electrode.
4. The optical compensation element as claimed in claim 1 , wherein different voltages can be applied to the drive electrodes.
5. An optical compensation element having:
a first transparent surface on which a transparent electrode is fit,
a second transparent surface on which a plurality of transparent main electrodes are arranged, which are connected at one point, and only one point, to a transverse electrode and, via this, to drive electrodes,
a material which changes its refractive index as a function of the applied voltage and is arranged between the first and the second transparent surface, wherein the supply electrodes are arranged between the main electrodes and the transverse electrode and their contact points with the transverse electrode are arranged at unequal distances.
6. The optical compensation element as claimed in claim 5 , wherein both the first and second transparent surfaces have structured electrodes.
7. An appliance for reading or writing to optical recording media, having a compensation element as claimed in claim 1 .
8. An appliance for reading or writing to optical recording media, having a compensation element as claimed in claim 5 .