Guide system for optical systems, particularly zoom systems
The invention relates to a guide system for optical systems, particularly for zoom systems, with which optical assemblies such as lenses and/or sets of lenses can be moved along an optical axis ( 16 ). The proposed guide system comprises a housing ( 2 ) defining an internal diameter ( 1 ) and extending along the optical axis ( 16 ). A slide ( 3 ) is configured to accommodate an optical assembly ( 19 ) and has a sleeve segment ( 15 ) which has on its outside a plurality of contact surfaces ( 4 ) for abutment on the internal diameter ( 1 ) of the housing ( 2 ). For defined movement of the slide ( 3 ) along the optical axis ( 16 ) a drive unit ( 12 ) is provided. A device ( 17 ) serves to hold the sleeve segment ( 15 ) at the internal diameter ( 1 ), another device ( 18 ) serves to secure the slide ( 3 ) against rotation in the cross-sectional area of the housing. The guide system according to the invention provides guidance which is absolutely free from play and low in friction. Openings ( 10 ) in the housing allow access to the lenses for adjustment and cleaning.
1. A guide system for a zoom system for guiding movement of zoom components along an optical axis in relation to each other, the guide system comprising:
a housing including a passage extending along the optical axis, the passage accommodating an internal diameter;
at least two slides, each slide being adapted to hold one of the zoom components and including only one sleeve segment having an outer wall and a plurality of contact surfaces on the outer wall for abutment against an inner wall of the housing, the sleeve segment describing an arc of less than 180°;
a spindle cam coupled to the at least two slides for moving the at least two slides along the optical axis, the spindle cam being arranged laterally of the at least two slides in an opening of the housing when the guide system is viewed in a cross-sectional plane perpendicular to the optical axis;
means for biasing the plurality of contact surfaces of the sleeve segment in a radial direction for abutment with the inner wall of the housing; and
means for securing the slide against rotation relative to the housing about the optical axis.
2. The guide system according to claim 1 , wherein the sleeve segment comprises four contact surfaces on the outer wall.
3. The guide system according to claim 1 , wherein the sleeve segment describes an arc of 120°.
4. The guide system according to claim 1 , wherein the sleeve segment describes an arc of 90°.
5. The guide system according to claim 1 , wherein the at least two slides have respective sleeve segments arranged to occupy different angular sectors about the optical axis.
6. The guide system according to claim 1 , wherein the biasing means includes a magnet mounted outside of the passage and a magnetisable material included in the sleeve segment.
7. The guide system according to claim 6 , wherein the plurality of contact surfaces are made of magnetisable material.
8. The guide system according to claim 1 , wherein the biasing means includes a spindle extending radially from the corresponding slide and a magnet mounted at a distal end of the spindle.
9. The guide system according to claim 8 , wherein the housing includes a longitudinal slot receiving the spindle to allow axially directed movement of the corresponding slide.
10. The guide system according to claim 9 , wherein the longitudinal slot includes a steel strip.
11. The guide system according to claim 9 , wherein a ball bearing is mounted on the spindle for engaging the longitudinal slot.
12. The guide system according to claim 1 , wherein the housing is cylindrical.
13. The guide system according to claim 1 , wherein the housing includes rails extending parallel to the optical axis and arranged around the internal diameter to define the passage.
14. The guide system according to claim 1 , wherein the housing includes two opposing V-shaped surfaces extending parallel to the optical axis and arranged adjacent the internal diameter to define the passage.
15. The guide system according to claim 1 , wherein housing includes at least one segment shaped opening allowing access to the passage.