EP2680738A1 - Ensemble projecteur et appareil médical équipé de cet ensemble projecteur - Google Patents

Ensemble projecteur et appareil médical équipé de cet ensemble projecteur

Info

Publication number
EP2680738A1
EP2680738A1 EP11708445.9A EP11708445A EP2680738A1 EP 2680738 A1 EP2680738 A1 EP 2680738A1 EP 11708445 A EP11708445 A EP 11708445A EP 2680738 A1 EP2680738 A1 EP 2680738A1
Authority
EP
European Patent Office
Prior art keywords
designed
optical module
eye
pattern
deflection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11708445.9A
Other languages
German (de)
English (en)
Inventor
Kurt Heiberger
Andreas Schnalke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EYESIGHT AND VISION GmbH
Original Assignee
EYESIGHT AND VISION GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EYESIGHT AND VISION GmbH filed Critical EYESIGHT AND VISION GmbH
Publication of EP2680738A1 publication Critical patent/EP2680738A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0091—Fixation targets for viewing direction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/1015—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for wavefront analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/1025—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for confocal scanning
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/008—Methods or devices for eye surgery using laser

Definitions

  • the invention relates to a pro ektorvoriques for projection of a flat pattern on a plane in an optical body, in particular in an eye, with a light source, which is designed to emit a light beam, with a deflection device which is designed to deflect the light beam to the To produce planar patterns, with an optical module, which is arranged between the light source and the plane and with a control device which is adapted to drive the deflection device so that the planar pattern is formed on the plane.
  • the invention also relates to a medical device with the projector device.
  • ophthalmology various methods have been established for the diagnosis and correction of vision defects of the human eye. So it is quite common to change the surface shape of the cornea by a flat laser ablation of the cornea to correct ametropia.
  • Other treatment methods include, for example, the so-called "welding on” of the retina in order to prevent its detachment
  • Many ophthalmic treatment methods are performed on an outpatient basis, in particular the patient's eye is not or only slightly prepared, for example, during treatment is able to change the viewing direction and also the accommodation of the lens of the eye.
  • the invention has for its object to provide a pro ektorvorraum and a medical device with the Pro ektorvorraum, which allow an improved projection of a two-dimensional pattern on a plane in an optical body, in particular in one eye.
  • the invention thus relates to a pro ektorvorraum for projecting a two-dimensional pattern on a plane, wherein the two-dimensional pattern as a geometric figure, letter, character, number, but also as an image, partial image, icon, etc. may be formed.
  • the plane onto which the planar pattern is projected is arranged in an optical body, in particular in a (human) eye.
  • the plane in the eye is defined by the retina of the eye, namely by the so-called yellow spot of the retina, that is to say the area of the retina which is responsible for a picture-sharp vision.
  • the plane here forms an auxiliary construction, which is to be adapted mentally to the surface extension of the yellow spot.
  • the projector device comprises a light source which is designed to emit a light beam.
  • the light beam can be realized in particular as a laser beam.
  • the light beam may also include a temporal succession of light or laser beams of different colors or wavelengths or a superimposition of light or laser beams with different wavelengths.
  • the light beam is formed with respect to the beam diameter smaller than 3 mm, preferably smaller than 1 mm and in particular smaller than 0.5 mm, so that it can be performed positionally accurate by the projector device.
  • a deflection device is designed to deflect the light beam in order to generate the planar pattern.
  • the areal pattern is written on the level, for example, represented by a row or column, for example. Instead of Lines or columns can also be realized other departure routes of the planar pattern.
  • the deflection device may, in principle, be formed as any scanner device, such as a moving prism, a moving lens, etc.
  • the deflection device is designed as a mirror scanner device, which makes it possible to deflect the light beam by a deflection angle in two independent directions.
  • the mirror scanner device is thus designed to be two-dimensionally controllable. Particularly preferred in order to save installation space and to allow high dynamics is the
  • Micromirror scanner device is formed, wherein the micromirror has a free diameter smaller than 7 mm, preferably smaller than 3 mm and in particular smaller than 2 mm.
  • the pro ector device comprises at least one optical module, which is arranged in the beam path of the light beam between the light source and the plane.
  • the optical module is designed as a beam-guiding or beam-shaping element for the light beam.
  • the optical module can be realized in one piece or even in several pieces.
  • a control device controls the deflection device and optionally the light source in such a way that the two-dimensional pattern is formed on the plane, in particular written or scanned.
  • the control device comprises, for example, a sequence program or is designed in a different manner in terms of programming and / or circuitry for the corresponding control of the deflection device.
  • the optical module has at least two regions with different focal lengths, through which the light beam can be guided alternately or successively with the deflection device. The at least two regions can thus be arranged next to one another or one behind the other in relation to the propagation direction of the light beam. By means of the deflection device, the light beam can thus be guided selectively onto one of the at least two regions.
  • the at least two regions can form at least two different focal points.
  • the at least two regions may have different optical axes.
  • the optical module in the direction of rotation or in the radial direction with respect to the refractive power or focal length varying, in particular discontinuous or non-differentiable varying designed.
  • control device controls the deflection device and the light source in such a way that the light beam, in particular selectively or alternately or successively, is guided through the at least two regions in order to resolve spatially resolved aberrations in the beam path of the light beam, in particular location-induced aberrations of the optical body, in particular spatially resolved to compensate for the eye and to project the planar pattern on the level aberration corrected.
  • a consideration of the invention is that it is advantageous for both diagnosis and treatment if the areal pattern is imaged undistorted and sharp on the plane, especially on the retina, especially on the yellow spot of the retina. This is contrary to the fact that accumulate aberrations in the beam path of the light beam.
  • the aberrations can be based on the one hand by the optical system of the pro ector device and on the other by the optical body, in particular by the eye.
  • the aberrations may, without further action, cause the areal pattern to be blurred or distorted on the plane.
  • the light beam for the projection of the planar pattern is selectively guided to the at least two areas with different focal lengths.
  • the controller for a desired pixel of the planar pattern on the plane, to select a suitable deflection angle at the deflection device and thus a suitable region of the optical module which, taking into account the aberrations, places the pixel at the desired position on the plane projected. If this procedure is selected for each pixel of the two-dimensional pattern, an aberration-corrected image of the two-dimensional pattern is displayed on the plane, in particular on the retina, in particular on the yellow spot.
  • the optical module is designed, for example, as a lens module, which comprises a plurality of circle segments, for example four Circular segments, as areas, wherein each of the circle segments has a different focal length. If a defocus is now to be corrected as an aberration for the areal pattern, then the light beam is passed through the circle segment, which has a focal length which best corrects the defocus. However, it is also possible that different areas of the areal pattern have different aberrations. In this case, a first subregion of the two-dimensional pattern is represented by projecting the light beam through a first circular segment having a first focal length and another subregion of the two-dimensional pattern is represented by projecting the light beam through a second circular segment having a second focal length.
  • each pixel of the planar pattern is represented by a light beam, which is guided through the range of the focal length, which corrects the aberrations, in particular optimally corrected.
  • the different areas with different focal lengths do not have to be distributed in circular segments, as shown by way of example, but they can also be arranged in any other way in the optical module, as will be illustrated below in different embodiments of the invention.
  • the advantage of the invention is the fact that aberration-corrected area patterns can be displayed on one level, wherein the system complexity can be kept low.
  • the deflection device is already present in the selected display mode via a writing or scanning process, and the control device must also be provided in principle.
  • the only additional component is through formed the optical module, which is however formed as a static optical module and thus does not significantly increase the complexity of the mechanical structure of the Pro ektorvoriques.
  • the production costs for the projector device only increased by a holder and the optical module itself, the control is software-based.
  • the planar pattern is designed as an accommodation target or optotype for the eye.
  • the accommodation target Through the accommodation target, the patient is projected on the yellow spot the image of an object etc. as a flat pattern and the patient is instructed to fix it.
  • the accommodation target is designed such that both the viewing direction and the accommodation of the lens can be adjusted in a targeted manner by fixing the patient.
  • the accommodation target is imaged such that the lens of the eye is accommodated to infinity, that is, relaxed. In this condition, the eye is best prepared for an examination or treatment.
  • the light source is designed as a laser beam source, which allows a transmission of a plurality of laser beams with different colors, so that the planar pattern is multi-colored.
  • the light beam is invisible.
  • the two-dimensional pattern forms a measurement pattern.
  • suitable sensor devices such as wavefront measuring devices, evaluated and detected aberrations of the eye.
  • the light source is designed to project visible, in particular monochrome or multicolored, light beams and invisible light beams optionally alternately or simultaneously onto the plane, e.g. in order to achieve an accommodation target with the visible light beams for fixing the viewing direction and the accommodation of the lens, and to enable a blanket measurement of the eye with the invisible light beam.
  • Control device formed, the deflection and the
  • the shift can z. B. stimulate a change in the line of sight of the patient, which is caused by a shift of the flat pattern and optionally the instruction to the patient to fix the object represented by the flat pattern, the patient to change the line of sight.
  • the displacement of the planar pattern, in particular of the measuring pattern can lead to a selective measurement of the eye.
  • the pro ector device comprises an operating device in which a shift of the flat pattern can be adjusted on the plane by a manual input.
  • the deflector is always with the same deflection pattern or any irregular
  • Deflection pattern which does not reflect the contour of the character represented by the area pattern, driven.
  • the deflection device is driven in a resonance mode, so that the light beam is always deflected with the same sequence of deflection angles.
  • This embodiment has the advantage that very small-scale microscanner mirrors are used which operate in resonant mode. Such microscanner levels have resonance frequencies between 100 Hz and 150 kHz or more, so that the areal pattern per second can be established several times, in particular more than 30 times, so that no flicker effect can arise for the patient.
  • the contour of the areal pattern and the selection of the areas are controlled by switching the light source on and off.
  • the deflection device is controlled so that always a complete or closed area is scanned in the plane and the accommodation target, optotypes and / or measurement pattern is achieved by selectively switching on and off the light source.
  • two deflector devices which are arranged separately from one another and can be deflected only in one deflection direction, are used as 1-D deflection devices, which together allow a two-dimensional deflection of the light beam.
  • at least one optical element is arranged in a beam path between the two 1-D deflection devices.
  • Pro ector device be reduced.
  • the different regions of the optical module with different focal lengths are arranged separately from one another and / or that the regions of different focal length of the optical module are interconnected via transition zones in which the focal lengths preferably change continuously.
  • the optical module has a measuring point range whose focal length is dimensioned such that a focal point is focused as a distance measuring point on the cornea of the eye.
  • This distance measuring point can be recorded with any camera and analyzed with regard to the diameter.
  • the distance measuring point can be used to set or check the correct distance of the pro ektorvorides to the eye. For example, the distance is so by automatic or manual manipulation of the projector device adjusted so that the diameter is minimal, so that the desired distance is set.
  • the optical module preferably resembles a lens, wherein the different regions, for example as the circle segments, or else as circular rings with different diameters can be arranged.
  • the optical module may be a so-called gradient lens (GRIN), wherein the focal length changes in the radial direction.
  • GRIN gradient lens
  • a radial region of the optical module is selected for each pixel of the optical pattern on the plane by the deflection angle of the deflection, which leads to a aberration corrected image.
  • the optical module may be formed as a diffractive optical module, wherein the different focal lengths are achieved by interference patterns on or in the optical module.
  • diffractive optical elements DOE are now industrially inexpensive to produce, so that after the design of a corresponding DOEs this is inexpensive in mass production.
  • DOE diffractive optical elements
  • it may be areas of zone plates or Fresnel lenses.
  • the optical module is designed as a reflective optical module, wherein the regions of different focal length are given by different reflection regions of the optical module.
  • the optical module can also be designed as a holographic optical module.
  • the pro ector device projects in each case a planar pattern in each eye of the patient, so that both eyes can be supplied without manipulation of the projector device with a two-dimensional pattern.
  • the two planar patterns can be designed so that a 3D image results for the patient.
  • Another object of the invention relates to a medical device with the projector device according to any one of the preceding claims, wherein the medical device is preferably designed as a wavefront measuring device, a cataract microscope or as a treatment laser system.
  • the medical device comprises a wavefront sensor for determining the spatially resolved aberrations of the optical body, in particular of the eye.
  • the wavefront sensor particularly preferably uses the backscattering or reflections of the planar pattern as input signals.
  • Wavefront measuring device and projector device can also be designed as a control circuit or as a control loop, wherein in the training as a control loop, the measured optical aberrations are corrected by controlling the projector device, so that after a few control passes aberration corrected area pattern is shown on the plane.
  • FIG. 1 is a schematic block diagram of a Pro ektorvoroplasty as a first embodiment of the invention
  • FIGS. 2 a, b show schematic beam paths for illustrating the mode of operation of the projector device
  • FIGS. 3 a, b, c, d show various embodiments of an optical module in the projector device in FIG. 1;
  • FIG. 4 shows a detailed detail from FIG. 1 in a possible embodiment of the invention
  • Figure 5 is a similar detail detail as in Figure 4 in another possible embodiment of the invention
  • Figure 6 is a schematic block diagram of a
  • Figure 7 is a schematic block diagram of a
  • Figure 8 is a schematic block diagram of a
  • FIG. 9 is a schematic block diagram of a
  • FIG. 10 is a schematic block diagram of a
  • Pro ector device as a sixth embodiment of the invention; Figures 11, 12 possible alternatives to the microscanner mirror in the previous figures.
  • FIG. 1 shows a highly schematic block diagram of a proctor device 1 which is designed to project a two-dimensional pattern 2 onto a plane 3 in a human eye 4.
  • the level 3 is defined by the area of the so-called yellow spot within the retina, which is responsible for the distinct vision of the eyes.
  • the areal pattern 2 may have, for example, a size in the eye or on the level 3 of 1 mm 2 .
  • the planar pattern may be formed, for example, as a ring, a figure, a sign, etc., and serves in particular in this embodiment as a Seh Schweizer or as an accommodation target for the patient. The accommodation target is projected onto the retina and instructed the patient to focus on it.
  • the viewing direction of the eye 4 and the accommodation of the lens 5 is brought into a defined state in order to simplify diagnoses, examinations or treatments.
  • the two-dimensional pattern 2 is designed as a measuring surface or measuring pattern and can also be formed, for example, by an invisible light beam.
  • the optotype or accommodation target can also be colored, in particular multicolored.
  • the projector device 1 comprises a light source 6, which is designed as a laser beam source and according to Beam path 7 emits a laser beam as a light beam.
  • the laser beam is linearly polarized.
  • the light beam preferably has a diameter of less than 0.5 mm.
  • the light beam strikes a beam splitter ST1, which can be polarization-dependent, for example, and is deflected away from it by an approximately 90-degree angle away from the eye 4. Subsequently, it first passes through a collimating lens LI, then passes through a lambda quarter plate lambda and subsequently impinges on a microscanner mirror 8, which can deflect the light beam by a deflection angle in two dimensions. On the way back, the light beam again traverses the lambda quarter plate lambda and the collimating lens LI and is subsequently collimated by it.
  • a beam splitter ST1 can be polarization-dependent, for example, and is deflected away from it by an approximately 90-degree angle away from the eye 4. Subsequently, it first passes through a collimating lens LI, then passes through a lambda quarter plate lambda and subsequently impinges on a microscanner mirror 8, which can deflect the light beam by a deflection angle in two dimensions. On
  • the light beam can now pass unimpeded in a polarization-dependent design of the beam splitter ST1 the beam splitter ST1, then applies to an optical module 9, enters the eye 4 and is projected onto the level 3.
  • the light beam is split.
  • the one partial beam then impinges on the optical module 9 and then enters the eye 9. Since the other partial beam is reflected in this case from the beam splitter ST1 to the laser beam source 6, the polarization-dependent beam splitter ST2 must reflect the light beam away from the laser source. This protects the laser source.
  • the treatment laser 14 is protected by suitable optical filters and / or optical isolators.
  • suitable optical filters and / or optical isolators By changing the deflection angle for the Light beam through the microscanner mirror 8, it is now possible by writing, scanning, in particular ordered by lines or columns, the planar pattern 2 on the level 3 to pro icial.
  • the microscanner mirror 8 is designed as an XY scanner and has a metallic mirror surface with for example a free diameter of 2 mm and allows a deflection of the incident laser beam by a deflection angle in two dimensions with frequencies of 100 Hz to 110 kHz or more.
  • the microscanner mirror MSS is driven in a resonance mode, so that it always performs the same and thus reproducible motion sequence.
  • the sequence of movements is selected such that the laser beam incident centrally on the microscanner mirror 8 is guided by the deflection about the deflection angle in such a way that it scans the area of the areal pattern 2 flat, scanning or writing.
  • the shape, contour or appearance of the planar pattern 2 is achieved by activation and deactivation - generally control - the light source 6, which is activated so that, for example, a ring or a point is projected as a flat pattern 2 on the plane 3.
  • the lens LI is designed as a collimator lens, which aligns the light beam parallel to the optical axis of the beam path.
  • the lens LI is transmitted centrally from the light beam pass, on the way from the microscanner mirror 8 to level 3, the lens LI - depending on the deflection angle - also off-center or even in the edge region of the Light beam passes through.
  • Idealized, a sharp, areal pattern 2 can be created on level 3 by the structure described so far.
  • aberrations in the beam path are generated by the optical system of the pro ektorvorraum 1 and in particular by the eye 4, so that the two-dimensional pattern 2 - depending on the aberrations - only blurred on the level 3 can be displayed.
  • the wavefront of the light beam must be changed so that each pixel of the two-dimensional pattern 2 is displayed on the level 3 aberration corrected.
  • this requires that the pixels of the two-dimensional pattern 2 are corrected for aberration or, in other words, that every ray of light which leads to a pixel of the two-dimensional pattern 2 must be corrected in the phase position.
  • the optical module 9 is provided, which - initially considered abstract - has several areas with different focal lengths.
  • FIG. 2 a shows the optical module 9 and three beam paths a, b, c of a light beam, starting from the microscanner mirror 8.
  • the optical module 9 has in this example three areas I, II, III, each having a different focal length. Generated to be a pixel P, which is on the optical axis
  • FIG. 2 b again shows three light beams a, b, c, which, however, are all performed through the region II, but at different radial positions.
  • the displacement of the radial position leads to a shift of the radial position of the puncture point in the plane 3.
  • By shifting all the pixels it is thus possible to distort planar patterns 2 in the plane 3 in order to compensate aberrations such as coma, astigmatism, etc.
  • any aberrations can thus be corrected.
  • FIGS. 1 Various embodiments for the optical module 9 are shown schematically in FIGS.
  • FIGS. 3a and 3b a refractive optical element is shown, which has different regions 12 as a lens array, the focal lengths of the individual regions 12 differing.
  • FIG. 3c a gradient lens is shown as an optical module 9, in which the various regions 12 are arranged as circular rings. The areas 12 can each have a constant focal length or the focal length can change continuously depending on the radius, for example.
  • FIG. 3d shows a diffractive optical element as an optical module 9, likewise with a plurality of regions 12, which each have a different focal length, as in the preceding figures.
  • FIG. 1 additionally shows an optional wavefront sensor 13 and an optional treatment laser 14.
  • the wavefront sensor 13 picks up the retroreflections from the eye 4 of the planar pattern 2 and can therefrom determine the local optical power of the eye 4 or its distribution and thus the aberrations in the eye 4.
  • the wavefront sensor is designed, for example, as a Shack-Hartmann sensor or as another aberrometer.
  • the measured aberrations are supplied to the control device 10 so that it can further improve the imaging of the flat pattern 2 for the first time or continuously.
  • the treatment laser 14 is guided coaxially with the light beam from the light source 6 via a second beam splitter ST2, so that the aberration correction also improves the beam path of the treatment laser 14 and in this way improved treatment results can be achieved.
  • FIG. 4 shows in highly schematic form a possible embodiment of the detail of the device in FIG. 1 in the region of the optical module 9 together with possible embodiments of the beam path 7 of the accommodation laser beam.
  • Accommodating laser beam is deflected via the microscanner mirror 8 and passes through a central region of the optical module 9, which is designed as a DOE (diffractive optical element), through.
  • a optotype is written as a flat pattern 2 directly and sharply on the retina of the eye 4.
  • Landolt rings are generated.
  • the entrance angle alpha of the accommodation laser beam into the eye 4 can be varied by again using different radial areas of the DOE 9 with different focal lengths.
  • the DOE 9 is designed so that the diffraction angle of the DOE 9 is a function of the distance to the optical axis.
  • the aim is to produce an identically sized optotype on the retina of the eye to be measured 4, which is independent of the refractive error.
  • the optotype is projected onto the eye 4 as an ellipse in the corresponding axis of the eye 4 to be measured, so that the patient gets to see a circular ring. If the pro ector device 1 is integrated into a wavefront measuring device, the image formed on the retina can be measured and checked with the wavefront measuring device.
  • FIG. 5 in a similar representation as in FIG. 4, the beam path 7 of FIG Accommodating laser beam with the optical module 9 shown as a gradient lens.
  • the accommodation laser beam is deflected via the microscanner mirror 8 and passes through a central region of the optical module 9 designed as a gradient lens.
  • a optotype is written directly and sharply on the retina of the eye 4.
  • the entrance angle alpha of the accommodation laser beam into the eye 4 can be varied by again using different radial areas of the gradient lens which have different focal lengths.
  • the optical module 9 is designed so that the exit angle of the gradient lens is a function of the distance to the optical axis. The aim is to produce an identically sized optotype on the retina of the eye to be measured 4, which is independent of the refractive error.
  • FIG. 6 shows a further embodiment of the invention in which the laser beam of a laser beam source LSI as light source 6 and the treatment beam of the laser 14 are brought together coaxially via mirrors or beam splitters ST3 and ST4 and deflected onto the microscanner mirror 8 via a deflection mirror US1.
  • the microscanner mirror 8 deflects the beam path 7 by 90 °.
  • microscanner mirror 8 and deflecting mirror US1 are arranged on a slide Ml movable in the direction according to arrow A in order to be able to adjust the distance between microscope scanner 8 and the lens LI, so that the local refractive error of the eye can be compensated for by displacement of the carriage Ml in that additional angular components are generated by the microscanner mirror 8 and the preceding optics LI and 9.
  • the following description applies to an optional measuring distance setting: Since the measurement accuracy and the local assignment of the measurement results in a diagnostic device of ophthalmology of the distance eye 4
  • the optical module 9 generates a small focal point on the vertex of the cornea of the eye 4 exactly the desired measurement distance.
  • the focal point is generated by passing the light beam through a measuring point region of the optical module 9 whose focal length is dimensioned accordingly. This measuring point region can be arranged, for example, in the edge of the optical module. If the eye 4 is not in the focal point produced, a more or less extensive spot appears on the cornea. This spot is evaluated with an observation camera integrated into the sensor device 13, so that the exact measuring distance is displayed to the user. The exact measuring distance is reached when the focal point has reached its minimum. The focal point for the measuring distance is needed only for aligning the pro ektorvoroplasty 1.
  • Laser sources LSI and LS2 differ in polarization.
  • the different polarization makes it possible to divide the beam path with the aid of a polarization-dependent mirror PST 1 in two different beam paths, so that the first laser beam source LS 1 only one eye 4 and the laser beam source LS 2 only in the other eye 4 is superimposed.
  • This has the advantage that the pro ector device 1 at the same time or in parallel can provide both eyes 4 with possibly different areal patterns 2.
  • the laser beams of the laser beam sources LSI and LS2 and possibly the treatment laser 14 are guided coaxially.
  • the laser beams are split as light beams through the polarization-dependent mirror PST 1 according to their polarization again into two separate beam paths.
  • Each of the beam paths is then guided via a deflecting mirror US2 or US3 and an eyepiece 02 or 03 to the associated eye 4.
  • the back reflections of the laser beams or the scattered light from the eyes 4 are again imaged onto the sensor device 13, so that an actual state of the wavefront of the laser beams of the associated laser beam source LSI and LS2 can be recorded by this for each eye 4.
  • the embodiment shown in Figure 7 is thus an extension of the projector devices 1 shown in the preceding Figures 1 and 6.
  • the extension allows stereoscopic vision, ie 3D vision, for example, to be able to measure the ametropia of both eyes under natural conditions.
  • the from the Microscanner 8 generated sheet-like pattern 2 are optically separated, so that provided for each eye 4 area pattern 2 is only perceived by the corresponding eye 4.
  • the laser beam sources are each formed in multiple colors, so that the two-dimensional pattern 2 are each multi-colored.
  • multi-color images can be used as a flat pattern 2, which show the patient realistically known objects or objects. This helps the patient to perceive the two areal patterns 2 as a common 3D image.
  • the two areal patterns 2 are produced with linearly polarized projection beams with different polarization directions of the laser beam sources LSI and LS2, the two areal patterns 2 can be separated by the polarization-dependent beam splitter or polarization-dependent mirror PST1. Vertically polarized beams are deflected to the right eye 4 and parallel polarized beams to the left eye 4 or vice versa. The two area patterns 2 are simultaneously modulated by the corresponding ones
  • Laser beam sources LSI and LS2 generated i. E. the laser beam sources are only possibly color-correct activated if a corresponding pixel on the level 3 to be generated.
  • the projector device generates both two-dimensional patterns 2 e.g. with the same and maximum resolution and maximum frame rate, so that the image structure of the two-dimensional pattern 2 is not perceived by the patient scanning the eye 4.
  • the two planar pattern 2 can be separated in another embodiment, even if the eyepieces 02 and 03 are equipped with polarization-dependent filters with, so that, for example, the right eyepiece 03 only read through vertically polarized beams and the left eyepiece 02 is transparent only for parallel polarized light.
  • a polarization-independent beam splitter instead of the polarization-dependent beam splitter PST1, a polarization-independent beam splitter is used.
  • the two-dimensional pattern 2 can in a different embodiment for the right and left eye 4 from the common microscope scanner 8 also sequentially. be projected into the eye 4 in quick succession with only one of the light sources LSI or LS2.
  • a shutter is then integrated in both eyepieces 02 and 03. These shutters only let light through alternately when the respective two-dimensional pattern 2 for the right and left eye 4 is generated.
  • the shutters are switched to be transparent by an evaluation device PI in synchronism with the image generation for the respective eye 4.
  • the advantage of this embodiment is that only a single arbitrary monochromatic or multicolor, in particular RGB light source is required to produce both planar patterns 2.
  • the image refresh rate is only half as high as in the example with the polarization-dependent laser beam sources LSI and LS2.
  • the eyepieces 02 and 03 optionally each have at least one lens whose focal length is electrically controllable.
  • the evaluation device PI controls or regulates the focal length of the eyepieces 02 and 03 so that, for example, the mean defective vision, the so-called sphere, of the respective eye 4 is compensated.
  • the aberrations of higher order, astigmatism, etc., of the respective eye must be corrected by the intelligent control of microscanner level and laser beam modulation.
  • Local aberrations of the respective eye 4 are individually corrected for the respective eye 4 by the optical module 9 with spatially dependent focal length using the same methods and devices as have already been described in connection with FIG.
  • the error-free image makes it possible to perceive a sharp 3D image.
  • control circuits in particular control circuits, can be implemented:
  • the Eyepieces 02 and 03 When binocular measuring the individual eye distance of the patient must be considered. Therefore, the lateral distance of the eyepiece 02, which is structurally rigidly connected to the deflecting mirror US2, can be displaced in the y direction relative to the eyepiece 03, which is structurally rigidly connected to the deflecting mirror US3. In order to achieve the high measuring accuracy, the measuring distance of the eye to the sensor device 13 designed as a wavefront sensor must remain constant. This is achieved by the distance of the eyepiece at a smaller distance of the eyepiece 02 to the eyepiece 03
  • the verification of the measuring distance can be done using the optics 9, as already described above.
  • the eyepieces 02 and 03 are always changed by the same distance to the optical axis, so that the structure remains symmetrical to the optical axis.
  • FIG. 8 shows a modification of the exemplary embodiment of FIG. 1, wherein the beam path in front of the microscanner mirror 8 is embodied analogously to FIG. 1, so that reference is made to the description there.
  • FIG. 9 shows a possible development of the sensor device Wl of the preceding figures.
  • FIG. 9 shows by way of example an application of the proctor device 1 in a wavefront measuring device.
  • the microscanner mirror 8 which is mounted on a movable in the Z direction and motor-driven carriage Ml, is positioned at a certain distance to the eyepieces 02 and 03. The distance to the eyepiece and the adjustable deflection angle of the microscanner mirror 8 ensure a nationwide scanning of the eye 4 on a surface of 10x10 mm2.
  • the laser beams of the laser beam sources LSI or LS2 are refracted at a defined angle, so that on the level 3 of the retina a lxl mm2 large, flawless area pattern. 2 , especially image is sharply displayed.
  • the laser beam scattered by the retina of the eye 4, which leaves the eye 4 in the immediate vicinity of the vertex of the eye 4, is detected by a detector D2.
  • the detector D2 measures the angle of these laser beams and calculates the local refractive error.
  • a diaphragm Bl through the eyepieces 02 or 03 and through the diaphragm 04 upstream optics 04 exactly on the cornea of the eye 4 better in the visual axis to be imaged by the eye.
  • the imaged diaphragm Bl ensures that only the laser beams that leave the eye 4 in the vicinity of the vertex of the eye 4 through an aperture with a diameter of, for example, 1 mm are evaluated. As a result, only the laser beams are evaluated, which are hardly broken on the way from the level 3 of the retina to the cornea through the layers of the eye.
  • the eyepieces 02 and 03 are designed as optics with electrically controllable focal length, for example, to correct the average aberrations of the optical system eye 4.
  • the focal length of the eyepieces 02 and 03 is controlled so that the laser beam which penetrates the cornea at a certain location penetrates into the eye at an angle of incidence which ensures a perfect imaging on the retina.
  • the change in the focal length of the eyepieces 02 and 03 compensates for example the mean refractive error of the eye 4.
  • this change in the focal length of the eyepieces 02 and 03 has the consequence that the location at which the diaphragm Bl is imaged, changes and falsifies the measurement result.
  • the optics 04 which is like the eyepieces 02 and 03 as optics with electrically controllable focal length, compensated by the fact that the focal length of the optics 04 optionally, depending on which eye 4 is to be measured, synchronous to the focal length of the eyepiece 02 or 03 is controlled. That is, if the focal length f of the eyepiece 02 is changed by ⁇ ⁇ f, the focal length of the optics 04 must be changed at the same time by the same value ⁇ ⁇ f, if, for example, the eyepieces 02 and 04 have the same optical design.
  • the eyepieces 02 and 03 can not be activated optically, ie the evaluation device PI sets the largest focal length, if possible 0 diopters, ie focal length 00 mm.
  • the optical module 9 takes over the correction of the entire aberrations.
  • FIG. 10 shows a very compact embodiment of a projector device 1.
  • the embodiment can be reduced to the laser beam sources LSI possibly LS2, the micro-scanner mirror 8, the optical module 9 and the evaluation device PI.
  • the evaluation device PI stores the control signal measured during the calibration for the microscanner mirror 8 and the radially spatially dependent focal length of the optical module 9.
  • the evaluation device PI controls the switching on and off of the laser beam while the microscope edge 8 deflects the laser beam so that images as a planar pattern 2 are projected free from aberrations.
  • FIG. 11 describes a replacement device for the microscanner mirror 8 of the preceding figures.
  • the goal is to generate the two-dimensional pattern 2 by means of individual beams, which emanate from a point source and form a defined angle with the optical axis, so that, for example, a rectangular area can be scanned across the surface.
  • two one-dimensional scanners MSS1 and MSS2 are used.
  • the scanner MSS1 swings in the x direction of the scanner MSS2 swings in the y direction.
  • the laser beam emitted by the laser beam source LSI first strikes the MSS1 scanner oscillating in the x direction. This deflects the pro etechnischsstrahl by the angle in the x direction.
  • the laser beam reflected by the scanner MSS1 is focused onto the one-dimensional scanner MSS2 by the lens L3, which may be an aspheric, for example.
  • the lens L3 can also be designed as a functionally identical lens.
  • the scanner MSS2 oscillates in the y direction and also deflects the projection beam by the angle ⁇ in the Y direction.
  • the projection beam receives a deflection in the x and y directions and completely replaces a 2D microscanner mirror. If the scanners MSS1 and MSS2 are not designed as resonance oscillators but as galvano scanners, each point of the projection surface can be controlled at any time and as long as the application requires it.
  • the light source LSI is implemented as a linearly polarized light source.
  • the polarisationsab ⁇ dependent beam splitter ST1 leaves the polarization direction by the other polarization direction reflects it.
  • the Pro etechnischsstrahl by the ⁇ / 4 plate P lambda / 4 is changed in its polarization direction.
  • the ⁇ / 4 plate P Lambda / 4 On the way to the MSS2 scanner, the ⁇ / 4 plate P Lambda / 4 generates right circularly polarized light, which is reflected by the scanner MSS2, which is designed as a metal mirror, and on the way from the scanner MSS2 to the beam splitter ST1 that is reflected by the reflection at the Metal mirror now left circularly polarized light in linearly polarized light through the ⁇ / 4 plate P lambda / 4 converted.
  • the direction of polarization rotates from eg perpendicular to parallel or vice versa.
  • FIG. 12 shows a further replacement device for the microscanner mirror 8.
  • the e.g. vertically polarized laser beam LSI is polarization-dependent
  • the ⁇ / 4 plate PI Lambda / 4 rotates the polarization direction in the double pass of e.g. perpendicular to parallel, so that the beam splitter ST1 focused by the lens L3
  • the focus is on the microscanner mirror MSS2.
  • the ⁇ / 4 plate P2 Lambda / 4 rotates together with the designed as a metal mirror microscanner mirror MSS2 the
  • Projection beam from the beam splitter ST1 is reflected two-dimensionally upward.
  • the ⁇ / 4 plate PI lambda / 4 or P2 lambda / 4 generates circularly from a linearly polarized projection beam polarized light and of circularly polarized light a linearly polarized light. It rotates the polarization direction of the linearly polarized
  • LS2 projection beam source RGB laser diode or SLD and IR
  • LI lens glass or plastic lens

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Abstract

L'objectif de l'invention est de concevoir un ensemble projecteur ainsi qu'un appareil médical pourvu de cet ensemble projecteur qui permettent une meilleure projection d'un motif bidimensionnel sur un plan dans un corps optique, en particulier un oeil. A cet effet, l'invention concerne un ensemble projecteur (1) conçu pour projeter un motif bidimensionnel (2) sur un plan (3) dans un corps optique, en particulier un oeil (4), comprenant une source lumineuse (6) destinée à émettre un rayonnement lumineux, un dispositif de déflexion (8) conçu pour défléchir le rayonnement lumineux pour générer le motif bidimensionnel (2), un module optique (9) qui est disposé entre la source lumineuse (6) et ledit plan (3), ainsi qu'un dispositif de commande (10) qui est destiné à commander le dispositif de déflexion (8) de manière que le plan bidimensionnel (2) soit formé sur le plan. Le module optique (9) comprend au moins deux zones (12) présentant différentes distances focales, à travers lesquelles le rayonnement lumineux est guidé alternativement ou successivement au moyen du dispositif de déflexion (8). En outre, le dispositif de commande (10) est conçu pour commander le dispositif de déflexion (8) et la source lumineuse (6) de manière que le rayonnement lumineux soit guidé à travers lesdites deux zones (12), pour compenser des aberrations optiques à résolution spatiale du corps optique et projeter le motif bidimensionnel (2) sur le plan avec correction des aberrations optiques.
EP11708445.9A 2011-03-04 2011-03-04 Ensemble projecteur et appareil médical équipé de cet ensemble projecteur Withdrawn EP2680738A1 (fr)

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