Optical: systems and elements – Compound lens system – Microscope
Patent
1994-05-04
1996-07-23
Nguyen, Thong Q.
Optical: systems and elements
Compound lens system
Microscope
359384, 359388, 359390, 359393, G02B 2100, G02B 2106
Patent
active
055395732
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a folding condenser for a microscope.
2. Discussion of Related Art
In the case of microscopes having a turret for receiving objectives with different magnification, these objectives are brought into the effective position alternately one after the other. However, rapid switching between these objectives also requires a corresponding adaptation of the illumination with respect to the aperture and the illuminated field. According to German patent document 2,116,625, this adaptation is achieved by a condenser in which there is provided not only a fixed basic condenser but also additional condenser lenses which can be switched into the path of the illuminating beam. These condenser lenses are connected to one another via a linkage, so that various switching positions permit a rapid adaptation of the illumination after a change of objective.
German patent document 2,626,864 discloses a further microscope universal condenser with fixed lens elements and with additional forcibly coupled lens elements, arranged in front of and behind the fixed part in the direction of the light. A lens element provided underneath the fixed lens is arranged in a swivel arm, the direction of movement of which is designed to be perpendicular to the optical axis. A further lens element is arranged on a carriage above the fixed lens and is moved perpendicularly to the optical axis and tangentially to the direction of movement of the second lens element. By means of a complex mechanical shifting linkage, the swivel movement of the arm is transferred by forced coupling into a linear movement of the carriage.
In known devices for exact forced coupling of the individual lens elements, great mechanical complexity is present. Due to the complicated mechanical guidance, the free working distance between the fixed lens and the lens elements to be switched is also small. The insertion of additional optical components for influencing the path of the illuminating beam is made more difficult as a result. Since the condenser head moved on the carriage is arranged very closely underneath the microscope stage, a corresponding recess must be provided here.
SUMMARY OF THE INVENTION
Taking the known prior art as a basis, it is therefore an object of the present invention to simplify the complicated mechanical structure of such a device and at the same time create a greater free working distance between the fixed lens element and the lens elements to be switched for the optional receiving of additional optical components.
This object is achieved according to the invention by providing a universal folding condenser with a first lens element and second and third lens elements disposed above and below the first lens element, the first lens being fixed and the second and third lens elements being alternately switchable into and out of an optical axis of the second and third lens elements for varying an aperture and an illumination field of the condenser. The condenser includes: a support arm positioned at an angle of 90.degree. with respect to the support plate; support plate, the second pivot bearing being positioned above the first pivot bearing, and the first and second pivot bearings being perpendicular to the optical axis of the second and third lens elements; and second lens element being fastened to the first limb of the first swivel arm, and the first pivot bearing being fitted to the second limb of the first swivel arm, the third lens element being fastened to the first limb of the second swivel arm, and the second pivot bearing being fitted to the second limb of the second swivel arm, wherein the second limbs of the first and second swivel arms are coupled to each other for transferring a swivelling movement.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in more detail with reference to an exemplary embodiment with the aid of the diagrammatic drawings, in which:
FIG. 1 shows a view of the microscope condenser
FIG. 2 shows a section through the micro
REFERENCES:
patent: 3833283 (1974-09-01), Stankewitz
patent: 4136927 (1979-01-01), Lisfeld
patent: 4573772 (1986-03-01), Endo et al.
patent: 4807980 (1989-02-01), Dietrich et al.
Schalz Karl-Josef
Stahl Werner
Leica Mikroskopie und Systeme Systeme GmbH
Nguyen Thong Q.
Sikd-er Mohammad Y.
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