An endoscope tube having at least one image inversion system consisting of two rod lenses, in which the first rod ends, pointing to an intermediate image plane, have a marginal cylinder, which is mounted in the endoscope tube, in which the second rod ends, which lie symmetrical to an aperture plane, have a diameter that is smaller than the inner diameter of the endoscope tube, so that the end surfaces associated with the first rod lenses are convex in configuration, the end surfaces associated with the second rod ends can be cemented together with a lens element, and a distance holder that defines the aperture area is inserted between the two rod lenses, is characterized in that the rod diameter in each case continually decreases from the marginal cylinder toward the second rod end.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a familiar endoscope from the prior art having a rigid insertion art.
FIG. 2 shows a section of the insertion part in cross-section.
FIG. 2 a, b shows various versions of a distance holder.
FIG. 3 shows the cross-section of an additional embodiment.
FIG. 4 shows a disk-shaped distance holder with front-end projection.
Claims
1. An endoscope tube having at least one image inversion system consisting of two rod lenses, in which the first rod ends, which point to an intermediate image plane have a marginal cylinder which is mounted in the endoscope tube, in which the second rod ends, lying symmetrically to an image plane have a diameter that is smaller than the inner diameter of the endoscope tube, wherein the end surfaces associated with the first rod ends are configured as convex, the end surfaces associated with the second rod ends can be cemented with a lens element, and between the two rod lenses a distance holder that defines the aperture area is inserted, characterized in that each rod diameter from the marginal cylinder to the second rod end continually decreases
2. An endoscope tube according to claim 1, characterized in that the rod lenses between the marginal cylinder and the second rod end are configured in a conical shape.
3. An endoscope tube according to claim 1, characterized in that the diameter of the marginal cylinder is equal to about one-fifth of the rod length and the diameter of the end surface of the second rod ends to about one-tenth the rod length.
4. An endoscope tube according to claim 1, characterized in that the length of the marginal cylinder in each case is less than or equal to one-third of the total length of the rod lens and is greater than half of the diameter of the marginal cylinder.
5. An endoscope tube according to claim 1, characterized in that the distance holder is configured with a recess on each side in the axial direction, open to the aperture area, for the second rod lens.
6. An endoscope tube according to claim 5, characterized in that the recess open in the axial direction has a funnel shape.
7. An endoscope tube according to claim 5, characterized in that the length of the distance holder, the aperture angle, and the aperture diameter of the recess are adjusted to the shape of the second rod ends in such a way that in their projection the cemented surface of a lens element lies free in the aperture area and a predetermined distance occurs from the lens element to the aperture plane.
8. An endoscope tube according to claim 5, characterized in that the distance holder is formed as a disc-shaped body that is elastic in the radial direction and rigid in the axial direction, and which has a aperture passing through in the axial direction for an imaging beam parcel, so that the outer margins of the aperture are configured so that they widen toward the axially directed contracted rod ends.
9. An endoscope tube according to claim 8, characterized in that the marginal edges is configured so that it widens like a funnel toward the recess of convex shaped rod lens margins.
10. An endoscope tube according to claim 5, characterized in that the distance holder is made of an elastic material.
11. An endoscope tube according to claim 5, characterized in that the distance holder is radially contiguous and springed to the endoscope tube.
12. An endoscope tube according to claim 5, characterized in that the distance holder is made as a single die-cast mold piece.
13. An endoscope tube according to claim 5, characterized in that the distance holder is made of several segments divided in axial direction.
Patent Application
20070219414
