Endoscope lens, and an endoscope equipped with such a lens
AssigneeKarl Storz GmbH & Co. KG
InventorFang Lei
Life of this patent
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Abstract
The invention relates to an endoscope lens which shows only a low level of distortion even at large angles of sight and whose elements can be produced and assembled with little effort, consisting of a first lens group having negative total refractive power, of an aperture diaphragm, and of a second lens group having a positive total refractive power, whereby all lens surfaces are spherical and all lenses are made of homogeneous materials. The first lens group contains at least one positive lens which is primarily arranged in the beam direction, and at least one negative lens, whereby the negative lenses in the first lens group are biconcave or plano-concave lenses. The invention also relates to an endoscope equipped with a lens of this type.
Claims18
Endoscope lens with
- a first lens group in the beam direction having a negative total refractive power,
- an aperture diaphragm situated after the first lens group, and
- a second lens group having a positive total refractive power, situated after the aperture diaphragm,
- whereby the first lens group contains at least one lens with positive refractive power and at least one lens with negative refractive power,
- whereby one positive lens is arranged first in the beam direction, and
- whereby all lenses as optically effective surfaces have only spherical surfaces and are made only of material with homogenous refractive index, distinguished in that
- the negative lenses in the first lens group are plano-concave lenses.
Endoscope lens with
- a first lens group in the beam direction having a negative total refractive power,
- an aperture diaphragm situated after the first lens group, and
- a second lens group having a positive total refractive power, situated after the aperture diaphragm,
- whereby the first lens group contains at least one lens with positive refractive power and at least one lens with negative refractive power,
- whereby one positive lens is arranged first in the beam direction, and
- whereby all lenses as optically effective surfaces have only spherical surfaces and are made only of materials with homogenous refractive index, distinguished in that
- the negative lenses in the first lens group are biconcave or plano-concave lenses;
- and
- the second lens group has a plurality of cemented doublets.
Dependencies are inferred from the claim text.