DE2640353A1 - ENDOSCOPTICS - Google Patents

Description

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Dr. Hugo Wilckan

DIpHn ₂ . Thomas Wifckw - 7. $ 60, fc, J.

Dl I. Chem. D-. WaIf; ^, runner OC / Π QKQ

Applicant: Richard Wolf GmbH, Pforzheimer Str. 22, 7134 Knittlingen

Endoscope optics

The invention relates to an endoscope optics with a Objective lens system of variable focal length and an adjoining optical with a proximal eyepiece Image transmission system.

It is known (DT-PS 1 234 920) for an endoscopic periscope a rod-shaped fiber image guide to assign an adjustable lens in a cladding tube, which opposite the image guide Can be adjusted lengthways, so that when the object distance from the lens changes, the image is opened again by adjusting the image guide the distal end surface of the image guide is adjusted, whereby a focus is achieved with changing object distance.

In contrast, it is advantageous for the examining doctor if it is made possible for him with a constant object distance from the lens to achieve a change in the image scale or image enlargement of the object. This means that the doctor can always use the lens Work far enough away from the object so that injuries to the body cavity are eliminated in any case. To this end is already an endoscope optics became known (DT-AS 1 766 695), in which the Lens consists of two converging lenses or two lens groups that

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both to change the focal length together from the proximal At the end are moved towards one another or away from one another via wires or the like, so that on the one hand the image scale is changed and on the other hand the image always remains directed to the distal end of a fiber image guide. This common control of the two objective collecting lenses requires a complicated mechanical structure in the optical tube and the passage of control wires with the required enlargement of the diameter of the optics. In the case of a vario endoscope according to patent 1 566 112, the with the enlargement the exit pupil, i.e. about the same amount as the enlargement increases, the exit pupil is reduced, so that there is no longer enough light available for the production of photos or films.

The object of the invention, therefore, is to compensate for the occurring of the lens focal length by the change in displacement of the focal point and thus the image location in a simple manner at an approximately constant image brightness or exit pupil at a possibility of changing the imaging scale at a constant lens pitch.

This object is achieved according to the invention in that in the endoscope optics mentioned at the beginning, in addition to the objective of variable focal length, the eyepiece also consists of two lenses or lens groups, of which the distal objective lens with the '. distal-side ocular lens are provided in a jacket tube and the proximal-side objective lens with the proximal-side ocular lens together with a between the distal-side ocular lens and the proximal-side objective lens and the proximal-side objective lens

Lenticular lens system, which transmits the image, is arranged in an optical tube which is longitudinally displaceable with respect to the cladding tube are.

This solution makes it possible to achieve a desired magnification of the object image while maintaining the same distance between the objective and the object to be achieved by simply moving the cladding tube in relation to the optics tube. The one that occurs on the object side is thereby Image location errors compensated on the eyepiece side, with the exit pupil remaining almost constant, because with one Changing the focal length of the lens changes the focal length of the eyepiece only slightly or not at all. Thereby the picture of the object is transmitted to the eyepiece via the lens system of the optical tube, i.e. it is no longer necessary to display the image in the known way through the lens exactly to align the end of a fiber image guide of known type.

The invention is explained below with reference to the drawing, in the Figures 1 and 2, two longitudinal sections of the invention Endoscope optics in two different end positions of the objective and eyepiece lenses.

According to the drawing example, the objective of the endoscope optics consists of two separate lenses 1a and 1b or two separate lens groups and the eyepiece consists of two separate lenses 2a and 2b or a field lens 2a. and an achromatic lens 2b. The distal- side objective lens 1a and the distal-side ocular lens 2a are arranged in the ends of a cladding tube 3.

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The proximal-side objective lens 1b and the proximal-side ocular lens 2b are arranged in the ends of an optical tube 4, which also contains the image-transmitting lens system, which is located between the proximal-side objective lens 1b and the distal-side Eyepiece lens 2a is located.

The optics tube 4 consists of a tube part 4a running through the jacket tube 3 and a proximal tube part 4b, the the proximal eyepiece lens 2b receives and is enlarged in diameter compared to that of the cladding tube 3. The part 4a is connected to the tubular part 4a by pins 5 or webs which pass through elongated slots 6 of the cladding tube. But it also exists the possibility of connecting the proximal eyepiece lens to the optical tube part 4a by means of a linkage.

By shifting the cladding tube 3 with respect to the optics tube at a constant distance of the objective lens 1a from the object changes the focal length and thus the enlargement of the object image of the two-part objective 1a, 1b, while the focal length of the two-part eyepiece 2a, 2b changes only slightly, but the object-side error, namely the change in the image location on the eyepiece side is compensated without the exit pupil changing significantly when the image is enlarged, i.e. the image brightness is not influenced.

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Claims (2)

HfentanwUt · Dr. Hugo Wilckan 7th Sä * Dipl.-Ing. Thomaa Wilcken Dipl-Chem. Dr. Wolfgang Laufer SA LOtWCk. Width St.- 'S .---- 4 Applicant: Richard Wolf GmbH, Pforzheimer Str. 22, 7134 Knittlingen Expectations ( 1 J endoscope optics with an objective lens system of variable focal length and an adjoining optical image transmission system terminating with a proximal eyepiece, characterized in that in addition to the objective (la, 1b) of variable focal length, the eyepiece also consists of two or more lenses (2a, 2b) or .Lens groups consist of _t of which the distal-side objective lens (1a) with the distal-side ocular lens (2a) are provided in a jacket tube (3) and the proximal-side objective lens (1b) with the proximal-side ocular lens (2b) together with a distal-side ocular lens ( 2) and the objective lens (1b) located on the proximal side, the image-transmitting lens system: are arranged in an optics tube (4) which is longitudinally displaceable with respect to the cladding tube (3). 2. Endoscope optics according to claim t , characterized in that the cladding tube {3} is provided with longitudinal slots ([G>} ) in front of the proximal end and in front of the distal eyepiece lens (2a), through the webs or pins (; 5 > greifeji, which are connected on the one hand to the part (4a) of the optics tube that extends through the cladding tube and to a tube part (4b) of the optic tube that accommodates the proximal eyepiece lens C2b), which is widened in relation to the cladding tube. 809810/0478