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US 10,146,102 B2Granted
Multispectral iris device
AssigneeLeica Instruments (Singapore) Pte. Ltd.
InventorGeorge Themelis
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AssigneeLeica Instruments (Singapore) Pte. Ltd.
InventorGeorge Themelis
Estimating the term…
The invention relates to an iris device (1) for optical imaging systems (71), comprising an aperture arrangement (5) and to a medical imaging system (72) comprising a sensor (15), in particular a camera (15a). Conventional iris devices (1) known from the art unavoidably suffer a necessary trade-off between the depth of field and the amount of light transmitted through the optical system (71), i.e. in particular the amount of light incident on the sensor (15). This disadvantage results from the fact that iris devices (Wo one) of the art transmit or reject light in the same way for all wavelengths (43), i.e. show a spectrally flat transmission property. The disadvantages of prior art iris devices (1) are overcome by the present invention by providing an aperture arrangement (5) which comprises simultaneously at least two apertures (5a) coaxially arranged with respect to a light-transmission direction (70), each of the at least two apertures (5a) limiting light in a different spectral band (49) of the at least two discrete non-overlapping spectral bands (49). The inventive medical imaging system (72) solves the above disadvantages by further comprising at least one inventive iris device (1).
An iris device for optical imaging systems, the iris device comprising an aperture arrangement, the aperture arrangement comprising an integrated filter system limiting light at different degrees of limitation in at least two different wavelengths, wherein the filter system comprises a plurality of filters including:
The iris device according to 1, further comprising an aperture magazine, wherein the aperture magazine receives at least two aperture arrangements each in a respective movable iris receptacle, wherein one of the at least two movable iris receptacles is moved into the optical axis of the optical imaging system for use.
An iris device for optical imaging systems, the iris device comprising an aperture arrangement, the aperture arrangement comprising an integrated filter system limiting light at different degrees of limitation in at least two different wavelengths, wherein the filter system comprises at least one filter having at least one light transmitting spectral band, wherein the filter system comprises at least one linear variable edge filter having a spectral filter edge, whose spectral position varies depending on a distance to an optical axis of the iris device.
An iris device for optical imaging systems, the iris device comprising an aperture arrangement, the aperture arrangement comprising an integrated filter system limiting light at different degrees of limitation in at least two different wavelengths, wherein the filter system includes at least one filter layer embodied on a substrate, wherein the filter layer comprises a plurality of sub-layers of at least two different dielectric materials having at least one of different refractive indices and different layer thicknesses, wherein the different sub-layers are at least partially embodied on the substrate in an alternating manner, and wherein the filter layer is embodied on an outer portion of the substrate, wherein the outer portion encloses an untreated portion, and the dimension of the untreated portion within the plane of the substrate defines the diameter of the aperture.
A medical imaging system comprising:
Dependencies are inferred from the claim text.