Microscope device and flat revolver
AssigneeNikon Corporation
InventorToshiya SUZUKI
Life of this patent
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Abstract
A flat revolver mountable on a microscope device holds a plurality of objectives having different magnifications, the same design value of parfocal distance, and different working distances so that optical axes of the objectives are parallel, and has a recessed structure in which with respect to a region where a first objective among the plurality of objectives is held, a region where a second objective different from the first objective is held is recessed by a predetermined distance such that the tip of the first objective does not interfere with a structure on a stage of the microscope device at magnification switching operation for switching an observation magnification of an image of a specimen in the microscope device and focusing operation for an object of observation.
Claims10
A microscope device on which a revolver is mountable, the revolver holding a plurality of objectives having different magnifications, the same design value of parfocal distance, and different working distances, so that optical axes of the objectives are parallel,
- the microscope device comprising a drive unit configured to perform focusing operation for focusing by moving at least one of the revolver and a stage where the specimen is placed to change the distance between each objective and a specimen surface of the specimen,
- the revolver having a recessed structure in which a region where a first objective among the plurality of objectives is held is recessed by a predetermined distance with respect to a region where a second objective different from the first objective is held,
- a predetermined distance Db indicating the recessed distance with respect to the region where an objective a corresponding to the second objective among the plurality of objectives is held the region where an object b corresponding to the first objective having a shorter working distance than that of the objective a being set such that the tip of the objective a does not interfere with a specimen holder or a cover member of the specimen on the stage at the focusing operation for the objective b, and that the tip of the objective b does not interfere with the specimen holder or the cover member of the specimen on the stage at the focusing operation for the objective a, and
- the predetermined distance satisfies the following conditional expression.
- (Eb+Fa+h)−WDb<Db<WDa−(Ea+Fb+h)
- where
- Eb:
- the tolerance for the working distance of the objective b
- Fa:
- the distance by which the focus position of the objective a is movable toward the stage beyond the specimen surface in the focusing operation for the objective a
- h:
- the height of the specimen holder or the cover member of the specimen projecting from the specimen surface in a region on the stage facing the objectives
- WDb:
- the working distance of the objective b
- WDa:
- the working distance of the objective a
- Ea:
- the tolerance for the working distance of the objective a
- Fb:
- the distance by which the focus position of the objective b is movable toward the stage beyond the specimen surface in the focusing operation for the objective b.
A flat revolver mountable on a microscope device and configured to hold a plurality of objectives having different magnifications, the same design value of parfocal distance, and different working distances, so that optical axes of the objectives are parallel,
- the flat revolver having a recessed structure in which, with respect to a region where an objective a among the plurality of objectives is held, a region where an objective b different from the objective a and having shorter working distance than that of the objective a among the plurality of objectives is held is recessed by a predetermined distance Db such that, at focusing operation of a drive unit of the microscope device for focusing an object of observation for the objective b by moving at least one of the flat revolver and a stage where the specimen is placed to change the distance between each objective and a specimen surface of the specimen, the tip of the objective a does not interfere with a specimen holder or a cover member of the specimen on a stage of the microscope device, and that, at focusing operation of a drive unit of the microscope device for focusing an object of observation for the objective a, the tip of the objective b does not interfere with a specimen holder or a cover member of the specimen on a stage of the microscope device, and
- the predetermined distance Db satisfies the following conditional expression.
- (Eb+Fa+h)−WDb<Db<WDa−(Ea+Fb+h)
- where
- Eb:
- the tolerance for the working distance of the objective b
- Fa:
- the distance by which the focus position of the objective a is movable toward the stage beyond the specimen surface in the focusing operation for the objective a
- h:
- the height of the specimen holder or the cover member of the specimen projecting from the specimen surface in a region on the stage facing the objectives
- WDb:
- the working distance of the objective b
- WDa:
- the working distance of the objective a
- Ea:
- the tolerance for the working distance of the objective a
- Fb:
- the distance by which the focus position of the objective b is movable toward the stage beyond the specimen surface in the focusing operation for the objective b.
Dependencies are inferred from the claim text.