Objective lens changer for optical instruments
View Patent ↗The subject matter of the present disclosure generally relates to objective lens changers for optical instruments. In one embodiment, an objective lens changer includes an objective lens carrier moveably attached to a changer frame by a mechanical link arrangement. The objective lens carrier includes two or more objective lens positions. The mechanical link arrangement includes a first link section to provide translation of the objective lens carrier between the objective lens positions and a second link section arranged to control an alignment of the objective lens position with respect to the optical axis of the optical instrument.
1. An objective lens changer for an optical instrument, the objective lens changer comprising:
a changer frame arranged to be positioned with respect to an optical path of the optical instrument,
an objective lens carrier moveably attached to the changer frame by a mechanical link arrangement, wherein the objective lens carrier can be selectively positioned in the optical path by the mechanical link arrangement to adopt at least two objective lens positions, wherein the mechanical link arrangement comprises a first link section to provide translation of the objective lens carrier between the objective lens positions and a second link section spaced apart from the first link section in the direction of an optical axis, and arranged to control an alignment of the objective lens position positioned in the optical path with respect to the optical axis, and wherein the mechanical link arrangement is arranged to move the objective lens carrier in one plane and so that the translation between the objective lens positions involves both an angular movement and a linear movement of the objective lens carrier with respect to the optical axis.
2. The objective lens changer according to claim 1 wherein the mechanical link arrangement comprises kinematic positioning means arranged to provide repeatable positioning at each objective position.
3. The objective lens changer according to claim 2 wherein the kinematic positioning means comprises a kinematic ball and a vee-block arranged in mating relationship.
4. The objective lens changer according to claim 1 wherein the second link section comprises a lever arm pivotally connecting the changer frame and the objective lens carrier.
5. The objective lens changer according to claim 1 wherein the second link section comprises a guide pin and groove arrangement connecting the changer frame and the objective lens carrier and allowing a translation of the objective lens carrier along the optical axis.
6. The objective lens changer according to claim 1 wherein the first link section comprises a lever arm pivotally connecting the changer frame and the objective lens carrier, the lever arm being arranged for rotation between two end positions, each positioning the objective lens carrier with an objective lens position in the optical path.
7. The objective lens changer according to claim 6 wherein the lever arm being driven for rotation between the two end positions by a drive motor arrangement or manually by a user.
8. The objective lens changer according to claim 1 wherein the first link section comprises a cam profile arranged on the objective lens carrier and a cam-follower on the changer frame.
9. The objective lens changer according to claim 6 wherein the objective lens carrier comprises three or more objective lens positions.
10. An imaging system comprising the objective lens changer according to claim 1 .
11. A fluorescence imaging system comprising the objective lens changer according to claim 1 .