CZ2008159A3 - Optical system for colposcope - Google Patents

Abstract

In particular, the optical system for the colposcope and / or the recording device is provided with a pair of polarizing filters (1, 2), wherein the first polarizing filter (1) is disposed in the axis of the illumination beam (4) between the light source (3) and the illuminated object (11). to the object (11) and back to the light source (3) and the second polarizing filter (2) is located in the optical array in the axis of the reflected beam (9) between the illuminated object (11) and the image plane backward to the lens (6) and face to face object (11). From the initial position of the perpendicular polarization planes with the highest darkening of the image, one of the filters (1, 2) is rotated by 40 degrees. to 50.degree. or 220.degree. up to 230.degree. clockwise.

Description

Optical system for colposcope

Field of the invention

FIELD OF THE INVENTION The present invention relates to an optical system for, in particular, colposcopes, examination and recording devices and the like for monitoring certain parts of the body in both human and veterinary medicine.

BACKGROUND OF THE INVENTION

At present, colposcopes, possibly supplemented or combined with storage media for documentation or archiving, are used for colposcopy, ie for examination and imaging methods for assessing the morphology of normal and pathological suppository, vagina and possibly external female genitalia. In order to observe the cervix and similarly positioned parts of the body, illumination of the object is necessary, which presents a noticeable problem with so-called unwanted reflections on physiologically damp or metal surfaces which make observation difficult, and in particular scanning on the recording medium. Minor reflections can also overlook minor but diagnostically significant changes.

The task of the technical solution is to develop a colposcope, or its optical part, which would minimize or disturb the appearance of glare.

SUMMARY OF THE INVENTION

The object of the present invention is to provide an optical system for a colposcope and / or recording apparatus, the present invention having a pair of polarizing filters, wherein the first polarizing filter is disposed in the axis of the illumination beam between the light source and the illuminated object facing the object; * · · · Druhý φ druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý druhý located in the optical system in the axis of the reflected beam between the illuminated object and the image plane facing the object, with one of the filters rotated 40 ° to 50 ° or 220 ° to 230 ° clockwise from the starting position of the perpendicular polarization planes with the highest image darkness hands.

The essence is also that the filters can be placed in the lens of the colposcope lens by placing a first circular segment filter in the lower part of the circular socket in front of the light source and a second circular segment filter forming the second filter in the upper part of the circular socket as a whole a circular flat fill of the sleeve.

The first polarizing filter may also be located at the bottom of the colposcope ring in front of the light source, and the second polarizing filter may be located in the front end of the recording apparatus supplementing the colposcope, or may be provided placed in front of the lens of the recording device.

An advantage and higher effect of the optical system according to the invention is imaging for observation by the lens or for recording in a recording device without unwanted glare.

BRIEF DESCRIPTION OF THE DRAWINGS

Solution of optical system, resp. its illumination portion, according to the invention, is described by way of example with reference to the accompanying drawings, in which Fig. 1 is a pair of filters and a sleeve; Fig. 2 is a further step where the filters are applied face to face in a starting position the smallest amount of light, virtually their polarization planes are perpendicular. Giant. 3 illustrates clockwise rotation of the second filter by 45 [deg.] Or 225 [deg.], The first filter being facing the object, the reverse side to the source, and the second filter being facing the object, the reverse side to the eye;

4

4 Φ Φ Φ 4 4 β Φ 4 4 · · · 4 · 4 4 4

444 ΦΦ fφφφφ

Fig. 4 shows a cross-section through both filters and Fig. 5 shows the section exchange. Fig. 6, Fig. 7, Fig. 8 and Fig. 9 show specific exemplary embodiments of some apparatus.

DETAILED DESCRIPTION OF THE INVENTION

General common features of all the examples shown:

The light beam from a conventional light source 3 has transverse oscillations of light wave, which can be represented by lines, so-called light vectors, perpendicular to the direction of propagation, forming an area perpendicular to the axis of the beam, i.e. the direction of light propagation. After the beam is hit mainly on a wet surface, due to the laws associated with the impact of light on the boundary of two environments (surface refractive index and the angle of reflection for light reflection), polarization of light occurs as "reflections". perpendicular to the direction of propagation, but predominantly in one plane interlaced with the direction of propagation, that is, at one point of the beam, the light vectors are in a line perpendicular to the direction of propagation. This is because a part of the oscillation is "absorbed" so that the vibration in a straight line, not in a circle, prevails. This phenomenon is called polarization of light and is used in so-called polarization filters. Here in this technical solution, in the simplest embodiment, polarization of light by reflection after the impact of the beam at the interface of two environments is used. Generally, the polarizing filter "disturbs" oscillations in certain directions perpendicular to the propagation axis from the circular oscillation of the illuminating beam perpendicular to the propagation axis and passes mostly one direction, ie in a straight line, respectively. a line perpendicular to the axis of propagation. It also interrupts unwanted reflections in the reflected beam. This phenomenon is used by the optical system of the colposcope according to the technical solution.

Example 1 as a basic design solution

In the simplest embodiment, which also demonstrates the basic constructional solution and which can be applied additionally to the colposcope 7 or display device 10 used, the optical system is provided with a conversion lens with a pair of polarizing filters 1,2. In the part in front of the light source 3 there is a circular segment ·· · · 4 4 4 4 «· *

4 4 4 4 4 444

The first polarizing filter 1 and before entering the observation portion of the optical system is a circular segment of the second filter 2. . Both filters 1,2 are rotated 45 ° or 225 ° clockwise relative to each other and are positioned facing the object. Thus, the first polarizing filter 1 is disposed in the axis of the illumination beam 4 between the light source 3 and the illuminated object 11, facing the light source 3 and facing the object 11. The object 11 in the described embodiment is a cervix. The second polarizing filter 2 is located in the optical system in the axis of the reflected beam 9 between the illuminated object 11 and the image plane, being rotated 40 ° to 50 °, preferably 45 ° clockwise or 220 ° to 230 °, preferably 225 ° The second polarizing filter 2 is positioned with the back of the eye 6 and the face of the object 11.

Such a conversion lens can be easily made by placing the pair of polarizing filters 1,2 face-to-face (Fig. 1) and rotating to determine the position of the least light transmittance (Fig. 2). It is the position where most of the oscillations perpendicular to the axis of propagation are filtered out in two mutually perpendicular directions, the polarization planes are perpendicular. In this position, the second filter 2 closer to the object is rotated 180 ° about a vertical axis, both filters 1,2 being facing the object. The second filter 2, in front of the eyepiece 12, rotates clockwise by 45 ° or 225 ° (FIG. 3). In this position the reflections on the observed surface disappear. Filters 1.2, resp. their polarization planes are thus rotated relative to each other by 135 ° (ie 90 ° + 45 °), respectively. 315 ° (ie 90 ° + 225. Both filters 1,2 in the final position (placed on top of each other, facing the object) are cut according to the constructional requirements of the instrument (Fig. 4), smaller segment according to the light source size 3 and larger After the cut, one of the segments is replaced (Fig. 5) and the two segments forming the ring are fastened to the sleeve 8.

Example 2

In the embodiment of Fig. 6, the colposcope 7 is a recording device 10, specifically a camera. In the lens of the lens 6 there is a pair of filters 1,2 • Φ A * · 9 · · Φ Φ · φ φ φφφφφφφφ «« «φφφφφφφφφφφφφφφφφφφφφφφφφ

F 9 · Φ Φφ 9f rotated relative to each other at the position and angle described in the previous exemplary embodiment.

The illumination beam 4 from the source 3 passes through the first polarizing filter 1 and, after reflection from the illuminated cervix object 11, as reflected ray 9 returns to the optical system of the colposcope 7 via the second polarizing filter 2, the glare-free image is observed through the eyepiece 12.

Example 3

Fig. 7 shows a similar apparatus as in the previous embodiment, with the difference that the first polarizing filter 1 is located in front of the light source 3 of the colposcope 7 and the second polarizing filter 2 rotated by 45 ° or 225 °, - cameras.

Example 4

FIG. 8 shows an exemplary embodiment where the camera recording device 10 is integrated into the colposcope 7. A pair of polarizing filters 1,2 is used in a similar embodiment to that of FIG. 5 in the lens conversion lens 6.

Example 5

The embodiment according to Fig. 9 is specific in that a separate recording device 10 - camera is used, wherein the first polarizing filter 1 is placed in front of a separate or connected light source 3 and the second polarizing filter 2 rotated by 45 ° or 225 ° camera assembly as part of the lens 6.

Industrial applicability

The optical system according to the invention can be industrially manufactured as a whole for use in human and veterinary medicine, in particular for colposcopes or recording devices or combinations thereof, for the diagnosis, examination and imaging of body parts that need to be illuminated for visibility.

Claims (4)

An optical system, in particular for a colposcope and / or a recording device, characterized in that it is provided with a pair of polarizing filters (1, 2), wherein the first polarizing filter (1) is arranged in the axis of the illumination beam (4) between the light source (3). ) and the illuminated object (11) face to the object (11) and back to the light source (3) and the second polarizing filter (2) is located in the optical system of the reflected ray axis (9) between the illuminated object (11) and the image plane of the objective (6) and facing the object (11), wherein from the starting position of the perpendicular polarization planes with the highest image darkening, one of the filters (1,2) is rotated 40 ° to 50 ° or 220 ° to 230 ° clockwise. Optical arrangement according to claim 1, characterized in that the filters (1, 2) are arranged in the front lens of the colposcope (7) so that a first part of the ring (8) in front of the light source (3) is positioned first a circular sectional filter (1) and at the top of the circular sleeve (8) a second circular sectional filter (2) forming, with the second filter (2) as a whole, a circular flat panel filling of the sleeve (8). Optical arrangement according to claim 1, characterized in that the first polarizing filter (1) is located in the lower part of the collar collar (8) of the colposcope (7) in front of the light source (3) and the second polarizing filter (2) is located in the a device (10) supplementing the colposcope (7). Lighting system according to claim 1, characterized in that the first polarizing filter (1) is placed in front of the separate light source (3) and the second polarizing filter (2) is placed in front of the objective of the recording device (10).