Method for realizing a filter edge, optical thin-film and optical device with such a film
AssigneeBalzers Aktiengellschaft
InventorsJurgen Buchholz, Peter Wierer
Life of this patent
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Abstract
In order to reduce the number of thin-films necessary to construe an interference band-pass filter for exclusive transmission of light in the UVA range the filter edge towards smaller wavelengths in the spectral characteristic is realized by the absorption edge of the material of one of the thin-films of a thin-film interference filter which filter produces the band-pass filter edge directed towards higher wavelengths.
Claims58
A method for realizing a filter edge of an optical absorption filter with at least one thin film at a desired spectral position, comprising the steps of
- depositing a thin film material, comprising at least two composition materials, a first thereof exhibiting per se a spectral absorption edge above said desired spectral position, a second thereof exhibiting a spectral absorption edge below said desired spectral position;
- selecting the ratio of said two composition materials within said thin film material so that the resulting spectral absorption edge of said thin film material is spectrally located at least approximatively at said desired spectral position;
- exploiting said resulting absorption edge of said thin film material as said filter edge.
A method for realizing a filter edge in a thin film optical absorption filter system comprising at least one thin film, said filter edge being spectrally located between UVA spectral range, wherein light is to be transmitted or to be reflected, and UVB spectral range, wherein light is to be absorbed, comprising the step of exploiting the material inherent absorption edge of the material of said thin film as said film edge.
A method for realizing an optical thin film band-pass filter comprising the step of exploiting the material inherent absorption edge of a thin-film material as filter edge towards shorter wavelengths and realizing the filter edge towards larger wavelengths by means of thin-film interference.
An optical thin film for defining a desired spectral position of a filter edge between a spectral area wherein light is to be transmitted and a spectral area wherein light is to be blocked absorption, the material of said thin film comprising at least two composition materials, the spectral position of the material inherent absorption edge of said thin film material being defined by the ratio of said at least two composition materials and being at least approximately at the spectral position of said filter edge.
An optical absorption device comprising an optical filter with at least one optical thin-film, wherein a filter edge is defined by the absorption edge of the material of said thin-film which absorption edge being defined by the material composition of said thin-film material.
A sun-tanner apparatus comprising an optical filter device between ultraviolet source and optical output for tanning, said optical filter device comprising an optical band-pass filter transmitting light in the UVA range and blocking light in the UVB range and in the visible and/or near infrared spectral range, its filter edge between UVB and UVA spectral range being realized by the material inherent absorption edge of the material of a thin-film of an interference filter, the filter edge towards larger wave-length being realized by said interference filter.
Dependencies are inferred from the claim text.