DE102008056830A1 - Endoscope optical unit has lenses, which are shifted to flexibly extended slit pip, where inner diameter of slit pipe is larger than diameter of lenses - Google Patents

Abstract

The endoscope optical unit (1) has lenses (5.1, 5.2, 5.3), which are shifted to a flexibly extended slit pipe (2). The inner diameter of the slit pipe is larger than the diameter of the lenses. The arrangement of slit pipe and lenses is surrounded with a shrink sleeve (7).

Description

The The invention relates to an endoscope optics in the preamble of the claim 1 mentioned type.

Such an endoscope optic is from the EP 1 078 292 B1 in the 8th - 10 known. The slotted tube has a slot width of less than 180 °. It thus captures the lenses captive and secures them against jamming. The clamping takes place here due to the inherent spring force of the tube, which has a rest dimension smaller than the lens diameter.

With this construction, a good fixation of the lenses can be achieved. However, the disadvantage is that in the cited document in 9 shown need to expand the slot of the tube with force for assembly, and in particular for adjustment of the lenses, including tools are required.

The Object of the present invention is a generic To create endoscope optics, in which the lenses easier to adjust are.

According to the invention the inner diameter of the tube at rest larger as the lens diameter. The lenses can therefore be in the Pipe inserted and there easily and without disturbing clamping action be moved and adjusted thereby. Clamping happens here by an additional component, namely a the entire consisting of tube and lenses arrangement enclosing Shrink tube that presses the lenses against the tube and that elastic Compressing circumferential spring under reduction of the slot. As a shrink tube usually shrunk by heating can still with shrink tubing placed around the assembly last adjustments are made to the lenses until then by heating the shrinkage is performed. This design makes the possibilities for fine adjustment the lenses significantly improved and simplified, in particular during adjustment, no forces to keep open the slot required are.

advantageous Slot dimensions result from the claims 2-4.

In the drawing, the invention is for example and shown schematically. Show it:

1 an axial section through a portion of an endoscope optical system according to the invention and

2 a section along line 2-2 in 1 ,

The figures show an endoscope optics 1 with a slotted tube 2 , which has a slot of slightly less than 180 ° circumference. In the figures are the edges 3 and 4 of the slot shown.

Inside the tube 2 are three lenses 5.1 . 5.2 and 5.3 arranged, which are shown in the embodiment as the usual rod lenses of a relay lens assembly, as they are commonly used in endoscope optics. Instead of the elongated rod lenses 5.1 . 5.2 and 5.3 also shorter lenses, z. B. lenses of an objective may be provided.

The lenses 5.1 . 5.2 and 5.3 are arranged at a mutual distance, wherein in one case a baffle 6 between two lenses 5.1 and 5.2 is arranged, which abuts the front side against both lenses and keeps them at a distance.

To the arrangement of the slotted tube and the lenses 5.1 . 5.2 and 5.3 is a shrink tube 7 arranged from the outside against the pipe 2 lies and in the area of the slot, directly to the lenses 5.1 . 5.2 and 5.3 and the baffle 6 is applied. In the distance between the lenses 5.2 and 5.3 No glare tube is provided. Here, the shrink tube can move slightly between the lenses and thereby unfold a distance-securing effect.

When assembling, the lenses are first 5.1 . 5.2 and 5.3 and optionally blended tubes 6 into the slotted tube 2 inserted. The insertion can be done from the ends of the tube ago or laterally, to which the slot must be slightly widened. Because the slotted tube 2 has an inner diameter which is larger than the lens diameter at rest, the lenses can be 5.1 . 5.2 and 5.3 as well as the baffle 6 very easily move back and forth in the tube and rotate until the desired position is reached. Then the shrink tube 7 in ungeschrumpften, so far wide state pushed over, which is also possible without problems and without disturbing the adjusted adjustment. In the state with over-pushed shrink tube even last te adjustments to the lenses can be made. Subsequently, the shrink tube is shrunk, z. B. by the usual Heißluftbeaufschlagung.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1078292 B [0002]

Claims (4)

Endoscope optics ( 1 ) with lenses ( 5.1 . 5.2 . 5.3 ), which in an elastically circumferentially resilient, slotted tube ( 2 ) are clamped secure against displacement, characterized in that the inner diameter of the slotted tube ( 2 ) at rest is greater than the diameter of the lenses ( 5.1 . 5.2 . 5.3 ), and that the arrangement of slotted tube ( 2 ) and lenses ( 5.1 . 5.2 . 5.3 ) with a heat shrink tubing ( 7 ) is surrounded. Endoscope optics according to claim 1, characterized that the slot width is smaller than 180 ° circumferential angle. Endoscope optics according to claim 2, characterized that the slit width between 90 ° and 180 ° circumferential angle lies. Endoscope optics according to claim 3, characterized that the slit width between 165 ° and 170 ° circumferential angle lies.