An automatic ophthalmic optical biometer

Abstract

The present invention relates to the technical field of ophthalmic detection instruments, and particularly to a fully automatic ophthalmic optical biometer, which includes an optical path system for measuring the human eyeball. The optical path system includes a pupil imaging optical path for eyeball tracking; a Y-direction movement mechanism, on the top of which the optical path system is installed, and the Y-direction movement mechanism is used to drive the optical path system to move along the Y-axis direction; a Z-direction movement mechanism, above which the Y-direction movement mechanism is arranged, and the Z-direction movement mechanism is used to drive the optical path system to move along the Z-axis direction; an X-direction movement mechanism, above which the Z-direction movement mechanism is arranged, and the X-direction movement mechanism is used to drive the optical path system to move along the X-axis direction.

Description

Technical Field

[0001] The present invention relates to the technical field of ophthalmic detection instruments, and particularly to a fully automatic ophthalmic optical biometer. Background Art

[0002] The biological structure measurement of the eyeball is to measure the structural parameters of the eyeball by applying various relevant examination methods, such as axial length of the eye, corneal thickness, corneal curvature, corneal diameter, anterior chamber depth, pupil diameter, lens thickness, vitreous cavity length, intraocular pressure, refractive state, etc., providing a basis for the diagnosis and treatment of eye diseases. The axial length of the eye refers to the distance from the anterior corneal surface to the retinal pigment epithelium or the inner limiting membrane of the retina. Clinically, various diseases such as cataract, ametropia, strabismus, amblyopia, glaucoma, silicone oil-filled eye, and macular edema are accompanied by varying degrees of changes in the axial length of the eye. As an important parameter affecting the refractive degree of the eye, obtaining an accurate axial length of the eye can provide technical support for the monitoring and diagnosis and treatment of eye diseases, especially in the fields of corneal refractive surgery and calculation of intraocular lens power for cataract. The ophthalmic optical biometer is applicable to measuring the axial length of the patient's eye, corneal curvature, and anterior chamber depth in the ophthalmology department of a hospital, as well as measuring the corneal diameter of the human eye and calculating the power of the intraocular lens to be implanted as required.

[0003] The existing ophthalmic optical biometers require continuous interaction between the detection personnel and the patient, which is cumbersome, time-consuming, and laborious in finding the human eye and positioning, with a relatively large cumulative measurement error and poor accuracy of the detection results. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a fully automatic ophthalmic optical biometer, which solves the technical problems raised in the above background art.

[0005] To achieve the above object, one aspect of the present invention provides a fully automatic ophthalmic optical biometer, comprising:

[0006] An optical path system, the optical path system includes a pupil imaging optical path, a refractive power detection optical path, and an axial length detection optical path of the eye. The pupil imaging optical path is used to track and position the patient's eyeball, the refractive power detection optical path is used to detect the refractive power of the patient's eyeball, and the axial length detection optical path of the eye is used to detect the axial length of the patient's eyeball;

[0007] A Y-direction movement mechanism, the optical path system is installed on the top of the Y-direction movement mechanism, and the Y-direction movement mechanism is used to drive the optical path system to move along the Y-axis direction;

[0008] A Z-direction movement mechanism, the Y-direction movement mechanism is arranged above the Z-direction movement mechanism, and the Z-direction movement mechanism is used to drive the optical path system to move along the Z-axis direction;

[0009] An X-direction movement mechanism, the Z-direction movement mechanism is arranged above the X-direction movement mechanism, and the X-direction movement mechanism is used to drive the optical path system to move along the X-axis direction;

[0010] A control module, the control module controls the Y-direction movement mechanism, the Z-direction movement mechanism and the X-direction movement mechanism to drive the optical path system to move to align with the pupil center according to the pupil image detected by the pupil imaging optical path.

[0011] Preferably, the pupil imaging optical path includes, along the light irradiation direction, an LED lamp, a first slit diaphragm, a first lens, a window glass, a first imaging lens, a first plane mirror, a second imaging lens, a third imaging lens, a first aperture diaphragm, a band-stop filter and a first CMOS camera. The LED lamp generates light that is emitted to the eyeball through the first slit diaphragm and the first lens. The light reflected by the eyeball passes through the window glass and the first imaging lens and is incident on the first plane mirror for reflection. The light reflected by the first plane mirror passes through the second imaging lens, the third imaging lens, the first aperture diaphragm and penetrates the band-stop filter to reach the first CMOS camera. The photosensitive chip of the first CMOS camera displays the pupil image on the screen of the first CMOS camera.

[0012] Preferably, the pupil center of the pupil image, the reference center of the optical path system and the corneal standard ring are displayed on the screen of the first CMOS camera. The control module calculates the deviation distance between the reference center and the pupil center, and controls the Y-direction movement mechanism, the Z-direction movement mechanism and the X-direction movement mechanism to drive the optical path system to move so that the reference center and the pupil center coincide according to the deviation distance.

[0013] Preferably, the diopter detection optical path includes, along the light irradiation direction, a first SLD light source, a light homogenizer, a second aperture diaphragm, a second plane mirror, a first polarization beam splitter prism, a third plane mirror, a fourth plane mirror, a first Hartmann imaging lens, a second Hartmann imaging lens and a second CMOS camera. The first SLD light source emits laser light that passes through the light homogenizer and the second aperture diaphragm, is reflected by the second plane mirror to the first polarization beam splitter prism, and the light passing through the first polarization beam splitter prism passes through the third plane mirror and is then reflected by the fourth plane mirror to reach the eyeball. The light reflected by the eyeball is reflected by the fourth plane mirror, then passes through the third plane mirror, and then is reflected by the first polarization beam splitter prism and passes through the first Hartmann imaging lens and the second Hartmann imaging lens to reach the second CMOS camera. The control module calculates the diopter of the eyeball according to the eyeball lens data received by the second CMOS camera.

[0014] Preferably, the optical path for detecting the axial length of the eye includes, along the light irradiation direction, a second SLD light source, a second polarization beam splitter prism, a first corner cube prism, a second corner cube prism, a third aperture stop, a third polarization beam splitter prism, a / glass slide, a fifth plane mirror, a fiber optic lens, an optical fiber, and a first photoelectric sensor. The second SLD light source emits a laser beam which is split into two beams by the second polarization beam splitter prism. One of the beams is incident on the first corner cube prism, and the other beam is incident on the second corner cube prism. After reflection, the two beams return coaxially and are combined. The combined light beam passes through the third aperture stop and is incident on the first polarization beam splitter prism. The light beam reflected by the first polarization beam splitter prism passes through the / glass slide, the fourth plane mirror, and the window glass and then is incident on the eyeball. The light beam reflected by the eyeball is reflected by the fifth plane mirror to the fiber optic lens, is focused by the fiber optic lens and then transmitted through the optical fiber to the first photoelectric sensor. The control module calculates the axial length of the eyeball according to the photoelectric signal detected by the first photoelectric sensor. The first corner cube prism can move in the irradiation direction of the second SLD light source.

[0015] Preferably, the optical path system further includes an optical path for detecting the anterior depth, which includes an LED lamp group, a second slit diaphragm, and a second lens. The LED lamp group generates a light beam which passes through the second slit diaphragm and the second lens and is incident on the eyeball. The light beam reflected by the eyeball reaches the first photoelectric sensor. The control module calculates the anterior chamber depth of the eyeball according to the photoelectric signal detected by the first photoelectric sensor.

[0016] Preferably, the optical path system further includes an optical path for relaxing the lens, which includes a light emitting diode, a scenic film, a first object-image lens, and a second object-image lens. The light emitting diode generates a light beam which passes through the scenic film, the first object-image lens, and the second object-image lens, and is continuously reflected by the third plane mirror and the fourth plane mirror to the eyeball. The light beam reflected by the eyeball returns along the original path and reaches the scenic film. The light emitting diode, the scenic film, and the first object-image lens can move along the irradiation direction of the light emitting diode.

[0017] Preferably, the Y-direction movement mechanism includes:

[0018] A first stepping motor, which is connected to the control module;

[0019] A first belt drive structure, which is driven by the first stepping motor and is connected with a first lead screw;

[0020] A first fixed support, on which a first moving support is slidably connected. The first moving support is provided with a first lead screw nut, and the first lead screw meshes with the first lead screw nut. The optical path system is arranged on the first moving support, and a second photoelectric sensor is arranged on the first fixed support, and a sensor light-shielding plate is arranged on the first moving support;

[0021] A first guiding optical axis, which is fixedly arranged on the first fixed support and passes through the first moving support.

[0022] Preferably, the Z-direction motion mechanism includes:

[0023] A lead screw motor, the output end of which has a second lead screw, and the lead screw motor is connected to the control module;

[0024] A bearing seat, at the bottom of which a second lead screw nut is slidably arranged. The second lead screw nut meshes with the second lead screw. The second lead screw nut is fixedly connected with at least two second guiding optical axes, and the Y-direction motion mechanism is arranged on the tops of the at least two second guiding optical axes. A taper distance spring is connected between the bearing seat and the lead screw motor;

[0025] An anti-deviation optical rod, an anti-deviation bearing seat is arranged on the bearing seat, the anti-deviation bearing seat is sleeved on the anti-deviation optical rod, and the anti-deviation optical rod is connected to the Y-direction motion mechanism.

[0026] Preferably, the X-direction motion mechanism includes:

[0027] A second stepping motor, which is connected to the control module;

[0028] A second belt transmission structure, which is driven by the second stepping motor, and the second belt transmission structure is connected with a third lead screw;

[0029] A second fixed support, on which a second moving support is connected through a crossed roller guide. The second moving support is provided with a third lead screw nut, and the third lead screw meshes with the third lead screw nut;

[0030] The full-automatic ophthalmic optical biometer further includes a base, the X-direction motion mechanism is arranged on the base, and a plurality of support blocks are arranged below the base.

[0031] Compared with the prior art, the present invention provides a full-automatic ophthalmic optical biometer, which has the following beneficial effects:

[0032] 1. The first CMOS camera of the fully automatic ophthalmic optical biometer provided by the present invention can display the pupil center of the pupil image and the reference center of the optical path system. The control module calculates the deviation distance between the reference center and the pupil center and decomposes it into the X-axis deviation, Y-axis deviation, and Z-axis deviation, and controls the Y-direction movement mechanism, Z-direction movement mechanism, and X-direction movement mechanism to drive the optical path system to move so that the reference center and the pupil center coincide, thereby realizing automatic eye positioning during the detection process. The positioning efficiency is high and the accuracy is good, avoiding repeated searching and positioning of the human eye by the detection personnel and improving the efficiency of the detection work.

[0033] 2. The optical path system of the fully automatic ophthalmic optical biometer provided by the present invention includes a diopter detection optical path, an axial length detection optical path, and an anterior chamber depth detection optical path. It can simultaneously complete the measurement of eye data such as the diopter, axial length, anterior chamber depth, and corneal curvature of the patient's eyeball in one scan, greatly improving the detection efficiency of ophthalmic detection and realizing the measurement of high-precision eye biological parameters of the whole eye. Description of the Drawings

[0034] Figure 1 is the front view of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention;

[0035] Figure 2 is the side view of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention;

[0036] Figure 3 is the structural schematic diagram of the optical path system of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention;

[0037] Figure 4 is one of the structural schematic diagrams of the Y-direction movement mechanism of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention;

[0038] Figure 5 is the other structural schematic diagram of the Y-direction movement mechanism of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention;

[0039] Figure 6 is the structural schematic diagram of the Z-direction movement mechanism of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention;

[0040] Figure 7 is the structural schematic diagram of the X-direction movement mechanism of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention.

[0041] In the figure: 1. LED lamp; 2. First slit diaphragm; 3. First lens; 4. Window glass; 5. First imaging lens; 6. First plane mirror; 7. Second imaging lens; 8. Third imaging lens; 9. First aperture diaphragm; 10. Band-stop filter; 11. First CMOS camera; 12. First SLD light source; 13. Light homogenizing plate; 14. Second aperture diaphragm; 15. Second plane mirror; 16. First polarization beam splitter prism; 17. Third plane mirror; 18. Fourth plane mirror; 19. First Hartmann imaging lens; 20. Second Hartmann imaging lens; 21. Second CMOS camera; 22. Second SLD light source; 23. Second polarization beam splitter prism; 24. First corner cube prism; 25. Second corner cube prism; 26. Third aperture diaphragm; 27. Third polarization beam splitter prism; 28. Quarter-wave plate; 29. Fifth plane mirror; 30. Fiber optic lens; 31. Optical fiber; 32. First photoelectric sensor; 33. LED lamp group; 34. Second slit diaphragm; 35. Second lens; 36. Light-emitting diode; 37. Landscape film; 38. First object-image lens; 39. Second object-image lens; 40. First stepping motor; 41. First belt drive structure; 42. First lead screw; 43. First fixed support; 44. First moving support; 45. First lead screw nut; 46. First guiding optical axis; 47. Second photoelectric sensor; 48. Sensor light-shielding plate; 49. Lead screw motor; 50. Second lead screw; 51. Bearing seat; 52. Second lead screw nut; 53. Second guiding optical axis; 54. Non-polarizing light rod; 55. Non-polarizing bearing seat; 56. Taper distance spring; 57. Second stepping motor; 58. Second belt drive structure; 59. Third lead screw; 60. Second fixed support; 61. Guide rail; 62. Second moving support; 63. Third lead screw nut; 64. Base; 65. Support block. Detailed implementation manner

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Figure 1 is the front view of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention. Figure 2 is the side view of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention. The embodiment of the present invention provides a fully automatic ophthalmic optical biometer, as Figure 1 and Figure 2 shown, the fully automatic ophthalmic optical biometer may include:

[0044] Optical path system, the optical path system includes a pupil imaging optical path, a refractive power detection optical path, and an axial length detection optical path. The pupil imaging optical path is used to track and position the patient's eyeball. The refractive power detection optical path is used to detect the refractive power of the patient's eyeball. The axial length detection optical path is used to detect the axial length of the patient's eyeball;

[0045] Y-direction motion mechanism, the optical path system is installed on the top of the Y-direction motion mechanism, and the Y-direction motion mechanism is used to drive the optical path system to move along the Y-axis direction;

[0046] Z-direction motion mechanism, the Y-direction motion mechanism is arranged above the Z-direction motion mechanism, and the Z-direction motion mechanism is used to drive the optical path system to move along the Z-axis direction;

[0047] X-direction motion mechanism, the Z-direction motion mechanism is arranged above the X-direction motion mechanism, and the X-direction motion mechanism is used to drive the optical path system to move along the X-axis direction;

[0048] Control module, the control module controls the Y-direction motion mechanism, the Z-direction motion mechanism, and the X-direction motion mechanism to drive the optical path system to move to align with the pupil center according to the pupil image detected by the pupil imaging optical path.

[0049] In the embodiment of the present invention, the optical path system of the full-automatic ophthalmic optical biometer can track and position the patient's eyeball through the pupil imaging optical path, detect the refractive power of the patient's eyeball through the refractive power detection optical path, and detect the axial length of the patient's eyeball through the axial length detection optical path. The pupil imaging optical path is used to determine the center of the eyeball. The control module controls the Y-direction motion mechanism, the Z-direction motion mechanism, and the X-direction motion mechanism to drive the optical path system to move to align with the pupil center according to the detection result of the pupil imaging optical path, so as to realize automatic positioning of the eyeball during the detection process and improve the accuracy of the detection structure.

[0050] Figure 3 It is a schematic structural diagram of the pupil imaging optical path of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention. As Figure 3As shown, in an embodiment of the present invention, the pupil imaging optical path of the fully automatic ophthalmic optical biometer includes an LED lamp 1, a first slit diaphragm 2, a first lens 3, a window glass 4, a first imaging lens 5, a first plane mirror 6, a second imaging lens 7, a third imaging lens 8, a first aperture diaphragm 9, a band-stop filter 10, and a first CMOS camera 11 along the light irradiation direction. The light generated by the LED lamp 1 is irradiated onto the eyeball through the first slit diaphragm 2 and the first lens 3. The light reflected by the eyeball is irradiated onto the first plane mirror 6 through the window glass 4 and the first imaging lens 5 and undergoes reflection. The light reflected by the first plane mirror 6 passes through the second imaging lens 7, the third imaging lens 8, the first aperture diaphragm 9, and penetrates the band-stop filter 10 to reach the first CMOS camera 11. The photosensitive chip of the first CMOS camera 11 displays the pupil image on the screen of the first CMOS camera 11.

[0051] Through the above technical solution, the LED lamp 1, the first slit diaphragm 2, and the first lens 3 of the pupil imaging optical path of the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention are two sets of symmetrically arranged. The light (wavelength 940nm) generated by the LED lamp 1 is irradiated onto the eyeball through the first slit diaphragm 2 and the first lens 3. The two first light source modules are symmetrically arranged, which can enhance the reflected light of the eyeball and improve the pupil imaging effect. The light reflected by the eyeball is reflected by the first plane mirror 6 to the first CMOS camera 11. The photosensitive chip of the first CMOS camera 11 displays the pupil image on the screen of the first CMOS camera 11, thereby completing the acquisition and display of the pupil image.

[0052] Furthermore, in an embodiment of the present invention, the first CMOS camera 11 of the fully automatic ophthalmic optical biometer can display the pupil center of the pupil image and the reference center of the optical path system. The control module calculates the deviation distance between the reference center and the pupil center and decomposes it into the X-axis deviation, the Y-axis deviation, and the Z-axis deviation, and controls the Y-direction movement mechanism, the Z-direction movement mechanism, and the X-direction movement mechanism to drive the optical path system to move according to the deviation distance so that the reference center and the pupil center coincide, thereby realizing automatic eyeball positioning during the detection process. The positioning efficiency is high and the accuracy is good, avoiding the detection personnel from repeatedly searching and positioning the human eye, and improving the efficiency of the detection work.

[0053] Moreover, a corneal standard ring is also set on the screen of the first CMOS camera 11. The corneal curvature of the patient's eyeball can be calculated based on the relationship between the corneal diameter of the pupil image collected through the pupil imaging optical path mapped on the screen and the standard ring on the screen.

[0054] Such as Figure 3As shown, in an embodiment of the present invention, the diopter detection optical path of the full-automatic ophthalmic optical biometer includes a first SLD light source 12, a light homogenizing sheet 13, a second aperture diaphragm 14, a second plane mirror 15, a first polarization beam splitter prism 16, a third plane mirror 17, a fourth plane mirror 18, a first Hartmann imaging lens 19, a second Hartmann imaging lens 20, and a second CMOS camera 21 along the light irradiation direction. The first SLD light source 12 emits laser light that passes through the light homogenizing sheet 13 and the second aperture diaphragm 14, is reflected by the second plane mirror 15 to the first polarization beam splitter prism 16. The light passing through the first polarization beam splitter prism 16 passes through the third plane mirror 17 and is then reflected by the fourth plane mirror 18 to reach the eyeball. The light reflected by the eyeball passes through the fourth plane mirror 18, then passes through the third plane mirror 17, and is then reflected by the first polarization beam splitter prism 16 and passes through the first Hartmann imaging lens 19 and the second Hartmann imaging lens 20 to reach the second CMOS camera 21. The control module calculates the diopter of the eyeball based on the data of the eye lens received by the second CMOS camera 21.

[0055] The full-automatic ophthalmic optical biometer provided by the embodiment of the present invention emits laser light (wavelength 850 nm) through the first SLD light source 12, passes through the light homogenizing sheet 13 and the second aperture diaphragm 14 (the laser itself is speckled, and the speckles can be eliminated by passing through the light homogenizing sheet 13, and the second aperture diaphragm 14 changes the diameter of the laser), is reflected by the second plane mirror 15 to the first polarization beam splitter prism 16. The first polarization beam splitter prism 16 can eliminate one of the P light or S light. The light passing through the first polarization beam splitter prism 16 passes through the third plane mirror 17 and is then reflected by the fourth plane mirror 18 to reach the eyeball. The light returned from the fundus reaches the second CMOS camera 21 through the Hartmann imaging optical path. By calculating the data of the eye lens received by the second CMOS camera 21 and the standard data, the diopter of the eyeball can be obtained.

[0056] In an embodiment of the present invention, the fourth plane mirror 18 is designed to be fully transmissive to light with a wavelength of 940 nm and fully reflective to light with a wavelength of 850 nm, so as to realize the synchronous detection of the pupil imaging optical path and the diopter detection optical path.

[0057] In an embodiment of the present invention, as Figure 3As shown in the figure, the eye axis length detection optical path of the full-automatic ophthalmic optical biometer includes, along the light irradiation direction, a second SLD light source 22, a second polarization beam splitter prism 23, a first corner cube prism 24, a second corner cube prism 25, a third aperture stop 26, a third polarization beam splitter prism 27, a quarter-wave plate 28, a fifth plane mirror 29, an optical fiber lens 30, an optical fiber 31, and a first photoelectric sensor 32. The second SLD light source 22 emits a laser beam which is split into two beams by the second polarization beam splitter prism 23. One of the beams is incident on the first corner cube prism 24, and the other beam is incident on the second corner cube prism 25. After reflection, the two beams return coaxially and are combined. The combined light beam passes through the third aperture stop 26 and is incident on the first polarization beam splitter prism 16. The light beam reflected by the first polarization beam splitter prism 16 passes through the quarter-wave plate 28, the fourth plane mirror 18, and the window glass 4 and then is incident on the eyeball. The light beam reflected by the eyeball is reflected by the fifth plane mirror 29 to the optical fiber lens 30, is focused by the optical fiber lens 30, and then is transmitted to the optical fiber 31 and reaches the first photoelectric sensor 32. The control module calculates the eye axis length of the eyeball according to the photoelectric signal detected by the first photoelectric sensor 32. The first corner cube prism 24 can move in the irradiation direction of the second SLD light source 22.

[0058] Through the above technical solution, the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention emits a laser (wavelength 790nm) from the second SLD light source 22, which is split by the second polarization beam splitter prism 23, reflected by the first corner cube prism 24 and the second corner cube prism 25 respectively, and then combined. The combined light beam enters the human eye along the visual axis direction, reaches the cornea and the retinal pigment epithelium layer and then is reflected. When the first corner cube prism 24 moves, the two laser beams interfere at the fundus reflection, and then interfere again at the sclera. The first photoelectric sensor 32 receives the two interference signals and converts them into digital signals. The control module calculates the distance between the two interference peaks, which is the eye axis length of the patient's eyeball.

[0059] In the embodiment of the present invention, the fourth plane mirror 18 is further designed to be completely transparent to light with a wavelength of 790nm, and the fifth plane mirror 29 is designed to be completely transparent to light with a wavelength of 940nm and completely reflect light with a wavelength of 790nm, so as to realize the synchronous detection of the pupil imaging optical path, the diopter detection optical path, and the eye axis length detection optical path.

[0060] Specifically, the first corner cube prism 24 can be driven by a DC motor to move. A magnetic grating scale can be arranged on one side of the first corner cube prism 24. When the first corner cube prism 24 moves 5um on the magnetic grating scale, a value is read, so as to ensure that the amount of collected data is sufficient to support the calculation.

[0061] In an embodiment of the present invention, as Figure 3As shown in the figure, the anterior depth detection optical path of the fully automatic ophthalmic optical biometer includes an LED lamp group 33, a second slit diaphragm 34, and a second lens 35. The LED lamp group 33 generates light that passes through the second slit diaphragm 34 and the second lens 35 and irradiates the eyeball. The light reflected by the eyeball reaches the first photoelectric sensor 32, and the control module calculates the anterior chamber depth of the eyeball based on the photoelectric signal detected by the first photoelectric sensor 32. The LED lamp group 33, the second slit diaphragm 34, and the second lens 35 of the anterior depth detection optical path are two sets arranged symmetrically. By generating light through the LED lamp group 33, a 1*10mm light spot is generated through the second slit diaphragm 34, and the light becomes parallel light through the second lens 35 and irradiates the eyeball. The anterior chamber depth can be calculated through the geometric relationship with the returning light of the anterior chamber.

[0062] As Figure 3 shown, in an embodiment of the present invention, the lens relaxation optical path of the fully automatic ophthalmic optical biometer includes a light-emitting diode 36, a landscape film 37, a first object-image lens 38, and a second object-image lens 39. The light-emitting diode 36 generates light that passes through the landscape film 37, the first object-image lens 38, and the second object-image lens 39, and is continuously reflected to the eyeball through the third plane mirror 17 and the fourth plane mirror 18. The light reflected by the eyeball returns along the original path to reach the landscape film 37. The light-emitting diode 36, the landscape film 37, and the first object-image lens 38 can move along the irradiation direction of the light-emitting diode 36.

[0063] Through the above technical solution, the fully automatic ophthalmic optical biometer provided by the embodiment of the present invention emits light (wavelength 550nm) through the light-emitting diode 36, passes through the landscape film 37, and is continuously reflected to the eyeball through the third plane mirror 17 and the fourth plane mirror 18. The light reflected by the eyeball returns along the original path to reach the landscape film 37. Among them, the eye lens, the first object-image lens 38, and the second object-image lens 39 form a lens group, and the lower focus of its standard distance falls on the landscape film 37. Because the combined focal lengths of patients with different refractive errors are different, the light-emitting diode 36, the landscape film 37, and the first object-image lens 38 need to move along the irradiation direction of the light-emitting diode 36 to adapt to different patient populations with refractive errors. The purpose of the lens relaxation optical path is to make the patient's eyesight focus on infinity, so that the lens remains in a natural state, and the eyeball parameters can be measured more accurately in this state.

[0064] In the embodiment of the present invention, the fourth plane mirror 18 is further designed to be fully reflective to light with a wavelength of 550nm, and the third plane mirror 17 is designed to be fully reflective to light with a wavelength of 550nm and fully transmissive to light with a wavelength of 850nm, so as to realize the synchronous detection of the pupil imaging optical path, the diopter detection optical path, the eye axis length detection optical path, the anterior depth detection optical path, and the lens relaxation optical path.

[0065] Figure 4It is one of the schematic structural diagrams of the Y-direction movement mechanism of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention. Figure 5 It is the second schematic structural diagram of the Y-direction movement mechanism of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention. As Figure 4 and Figure 5 shown, in an embodiment of the present invention, the Y-direction movement mechanism of the full-automatic ophthalmic optical biometer may include:

[0066] A first stepping motor 40, and the first stepping motor 40 is connected to the control module;

[0067] A first belt transmission structure 41, the first belt transmission structure 41 is driven by the first stepping motor 40, and the first belt transmission structure 41 is connected with a first lead screw 42;

[0068] A first fixed support 43, a first moving support 44 is slidably connected to the first fixed support 43, a first lead screw nut 45 is arranged on the first moving support 44, the first lead screw 42 meshes with the first lead screw nut 45, and the optical path system is arranged on the first moving support 44;

[0069] A first guiding optical axis 46, the first guiding optical axis 46 is fixedly arranged on the first fixed support 43 and passes through the first moving support 44.

[0070] The first stepping motor 40 of the Y-direction movement mechanism of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention is connected to the control module. The control module controls the first stepping motor 40 to start and drive the first belt transmission structure 41 to rotate, thereby driving the first lead screw 42 to rotate. Through the transmission of the first lead screw nut 45 meshing with the first lead screw 42, the first moving support 44 moves smoothly in the Y-axis direction along the first guiding optical axis 46, so as to realize the movement adjustment of the optical path system in the Y-axis direction until the Y-axis deviation is 0.

[0071] Further, as Figure 4 shown, a second photoelectric sensor 47 is arranged on the first fixed support 43, and a sensor light-shielding plate 48 is arranged on the first moving support 44. The control module detects the precise position of the first moving support 44 through the second photoelectric sensor 47, and further precisely controls the moving distance of the first moving support 44 in cooperation with the first stepping motor 40 to improve the positioning accuracy.

[0072] Figure 6 It is the schematic structural diagram of the Z-direction movement mechanism of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention. As Figure 6 shown, in an embodiment of the present invention, the Z-direction movement mechanism of the full-automatic ophthalmic optical biometer may include:

[0073] The lead screw motor 49 has a second lead screw 50 at its output end, and the lead screw motor 49 is connected to the control module;

[0074] The bearing block 51 has a second lead screw nut 52 slidably disposed at its bottom. The second lead screw nut 52 meshes with the second lead screw 50, and the second lead screw nut 52 is fixedly connected to at least two second guide optical shafts 53. The Y-direction movement mechanism is disposed on the tops of the at least two second guide optical shafts 53;

[0075] The anti-deviation optical rod 54 has an anti-deviation bearing block 55 disposed on the bearing block 51. The anti-deviation bearing block 55 is sleeved on the anti-deviation optical rod 54, and the anti-deviation optical rod 54 is connected to the Y-direction movement mechanism.

[0076] Both of the two second guide optical shafts 53 of the Z-direction movement mechanism of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention are connected to the first fixed support 43 of the Y-direction movement mechanism. By controlling the lead screw motor 49 to start through the control module, the second guide optical shafts 53 are moved in the Y-axis direction through the driving action of the second lead screw nut 52 meshing with the second lead screw 50, so as to realize the movement adjustment of the optical path system in the Z-axis direction until the Z-axis deviation is 0. The anti-deviation optical rod 54 is also connected to the first fixed support 43 of the Y-direction movement mechanism, which can prevent the Y-direction movement mechanism and the optical path system from deflecting during the movement in the Z-axis direction, and improve the smoothness and accuracy of the movement.

[0077] In an embodiment of the present invention, as Figure 6 shown, a taper distance spring 56 is connected between the bearing block 51 and the lead screw motor 49 of the full-automatic ophthalmic optical biometer. The taper distance spring 56 can play a role in support and buffering, and further improve the operation stability of the full-automatic ophthalmic optical biometer.

[0078] Figure 7 is a schematic structural diagram of the X-direction movement mechanism of the full-automatic ophthalmic optical biometer provided by the embodiment of the present invention. In an embodiment of the present invention, as Figure 7 shown, the X-direction movement mechanism of the full-automatic ophthalmic optical biometer may include:

[0079] The second stepping motor 57 is connected to the control module;

[0080] The second belt drive structure 58 is driven by the second stepping motor 57, and the second belt drive structure 58 is connected to a third lead screw 59;

[0081] The second fixed support 60 has a second moving support 62 connected thereto through a guide rail 61. The second moving support 62 is provided with a third lead screw nut 63, and the third lead screw 59 meshes with the third lead screw nut 63.

[0082] Through the above technical solution, the second stepping motor 57 of the Z-axis movement mechanism of the fully automatic ophthalmic optical biometer is connected to the control module. The control module controls the second stepping motor 57 to start driving the third lead screw 59 to rotate. Through the transmission of the third lead screw nut 63 engaged with the third lead screw 59, the second moving support 62 moves along the guide rail 61 in the X-axis direction, so as to realize the movement adjustment of the optical path system in the X-axis direction until the X-axis deviation is 0. Finally, the reference center of the optical path system coincides with the pupil center, thereby realizing the automatic positioning of the eyeball during the detection process.

[0083] In an embodiment of the present invention, the guide rail 61 of the fully automatic ophthalmic optical biometer is a crossed roller guide rail. The crossed roller guide rail has a large ball contact area, a small friction coefficient, and high rigidity. Although the moving stroke is small, it can meet the use requirements of the fully automatic ophthalmic optical biometer.

[0084] As Figure 1 and Figure 2 shown, in an embodiment of the present invention, the fully automatic ophthalmic optical biometer further includes a base 64. The X-axis movement mechanism is arranged on the base 64, and a plurality of support blocks 65 are arranged below the base 64. The base 64 and the plurality of support blocks 65 provide stable support for the whole device, ensuring the smooth progress of the detection work.

[0085] In an embodiment of the present invention, the Z-axis movement mechanism and the X-axis movement mechanism of the fully automatic ophthalmic optical biometer may also be provided with photoelectric sensors to detect the precise positions of the corresponding components, accurately control the moving distance, so as to improve the positioning accuracy.

[0086] Working principle: The optical path system of the full-automatic ophthalmic optical biometer provided by the present invention includes a diopter detection optical path, an axial length detection optical path, and an anterior chamber depth detection optical path. The measurement of eye parameters such as the diopter, axial length, anterior chamber depth, and corneal curvature of the patient's eyeball can be completed simultaneously in one scan, greatly improving the detection efficiency of ophthalmic examinations and achieving high-precision measurement of eye biological parameters for the entire eye. The first CMOS camera 11 can display the pupil center of the pupil image and the reference center of the optical path system. The control module calculates the deviation distance between the reference center and the pupil center and decomposes it into the X-axis deviation, Y-axis deviation, and Z-axis deviation, and controls the Y-direction movement mechanism, Z-direction movement mechanism, and X-direction movement mechanism to drive the optical path system to move so that the reference center and the pupil center coincide, thereby realizing automatic eyeball positioning during the detection process. The control module controls the first stepping motor 40 to start and drive the first belt drive structure 41 to rotate, thereby driving the first lead screw 42 to rotate. Through the transmission of the first lead screw nut 45 meshing with the first lead screw 42, the first moving support 44 moves smoothly along the first guiding optical axis 46 in the Y-axis direction, thereby realizing the movement adjustment of the optical path system in the Y-axis direction until the Y-axis deviation is 0. By controlling the lead screw motor 49 to start through the control module, the second guiding optical axis 53 moves in the Y-axis direction through the transmission of the second lead screw nut 52 meshing with the second lead screw 50, thereby realizing the movement adjustment of the optical path system in the Z-axis direction until the Z-axis deviation is 0. By controlling the second stepping motor 57 to start through the control module and driving the third lead screw 59 to rotate, the second moving support 62 moves along the guide rail 61 in the X-axis direction through the transmission of the third lead screw nut 63 meshing with the third lead screw 59, thereby realizing the movement adjustment of the optical path system in the X-axis direction until the X-axis deviation is 0, and finally making the reference center and the pupil center of the optical path system coincide, thereby realizing automatic eyeball positioning during the detection process.

[0087] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic ophthalmic optical biometer, characterized in that, Comprising: An optical path system, the optical path system including a pupil imaging optical path, a diopter detection optical path, and an axial length detection optical path of the eye. The pupil imaging optical path is used to track and position the patient's eyeball. The diopter detection optical path is used to detect the diopter of the patient's eyeball. The axial length detection optical path of the eye is used to detect the axial length of the patient's eyeball; A Y-direction movement mechanism, the optical path system being installed on the top of the Y-direction movement mechanism, and the Y-direction movement mechanism being used to drive the optical path system to move along the Y-axis direction; A Z-direction movement mechanism, the Y-direction movement mechanism being arranged above the Z-direction movement mechanism, and the Z-direction movement mechanism being used to drive the optical path system to move along the Z-axis direction; An X-direction movement mechanism, the Z-direction movement mechanism being arranged above the X-direction movement mechanism, and the X-direction movement mechanism being used to drive the optical path system to move along the X-axis direction; A control module, the control module controlling the Y-direction movement mechanism, the Z-direction movement mechanism, and the X-direction movement mechanism to drive the optical path system to move to align with the pupil center according to the pupil image detected by the pupil imaging optical path; The pupil imaging optical path includes, along the light irradiation direction, an LED lamp (1), a first slit diaphragm (2), a first lens (3), a window glass (4), a first imaging lens (5), a first plane mirror (6), a second imaging lens (7), a third imaging lens (8), a first aperture diaphragm (9), a band-stop filter (10), and a first CMOS camera (11); the pupil center of the pupil image, the reference center of the optical path system, and the corneal standard ring are displayed on the screen of the first CMOS camera (11); The axial length detection optical path of the eye includes, along the light irradiation direction, a second SLD light source (22), a second polarization beam splitter prism (23), a first corner cube prism (24), a second corner cube prism (25), a third aperture diaphragm (26), a third polarization beam splitter prism (27), a quarter-wave plate (28), a fifth plane mirror (29), a fiber lens (30), a fiber (31), and a first photoelectric sensor (32).

2. The full-automatic ophthalmic optical biometer according to claim 1, characterized in that, The LED lamp (1) generates light that is emitted to the eyeball through the first slit diaphragm (2) and the first lens (3). The light reflected by the eyeball passes through the window glass (4) and the first imaging lens (5) and is emitted to the first plane mirror (6) for reflection. The light reflected by the first plane mirror (6) passes through the second imaging lens (7), the third imaging lens (8), the first aperture diaphragm (9), and penetrates the band-stop filter (10) to reach the first CMOS camera (11), and the photosensitive chip of the first CMOS camera (11) displays the pupil image on the screen of the first CMOS camera (11).

3. The full-automatic ophthalmic optical biometer according to claim 2, characterized in that, The control module calculates the deviation distance between the reference center and the pupil center, and controls the Y-direction movement mechanism, the Z-direction movement mechanism, and the X-direction movement mechanism to drive the optical path system to move so that the reference center and the pupil center coincide according to the deviation distance.

4. The full-automatic ophthalmic optical biometer according to claim 2, wherein The diopter detection optical path includes, along the light irradiation direction, a first SLD light source (12), a light homogenizing plate (13), a second aperture stop (14), a second plane mirror (15), a first polarization beam splitter prism (16), a third plane mirror (17), a fourth plane mirror (18), a first Hartmann imaging lens (19), a second Hartmann imaging lens (20), and a second CMOS camera (21). The first SLD light source (12) emits laser light that passes through the light homogenizing plate (13) and the second aperture stop (14), is reflected by the second plane mirror (15) to the first polarization beam splitter prism (16), and the light passing through the first polarization beam splitter prism (16) passes through the third plane mirror (17) and is then reflected by the fourth plane mirror (18) to reach the eyeball. The light reflected by the eyeball passes through the third plane mirror (17) after being reflected by the fourth plane mirror (18), and then passes through the first polarization beam splitter prism (16) after being reflected, and then passes through the first Hartmann imaging lens (19) and the second Hartmann imaging lens (20) to reach the second CMOS camera (21). The control module calculates the diopter of the eyeball based on the data of the eye lens received by the second CMOS camera (21).

5. The full-automatic ophthalmic optical biometer according to claim 4, characterized in that, The second SLD light source (22) emits laser light that is split into two beams by the second polarization beam splitter prism (23). One of the beams is incident on the first corner cube prism (24), and the other beam is incident on the second corner cube prism (25). After reflection, the two beams return coaxially and are combined. The combined light passes through the third aperture stop (26) and is incident on the first polarization beam splitter prism (16). The light reflected by the first polarization beam splitter prism (16) passes through the quarter-wave plate (28), the fourth plane mirror (18), and the window glass (4) and then is incident on the eyeball. The light reflected by the eyeball is reflected by the fifth plane mirror (29) to the fiber lens (30), is focused by the fiber lens (30), and is transmitted to the optical fiber (31) to reach the first photoelectric sensor (32). The control module calculates the axial length of the eyeball based on the photoelectric signal detected by the first photoelectric sensor (32). The first corner cube prism (24) can move in the irradiation direction of the second SLD light source (22).

6. The full-automatic ophthalmic optical biometer according to claim 5, characterized in that, The optical path system further includes a front depth detection optical path, which includes an LED lamp group (33), a second slit stop (34), and a second lens (35). The LED lamp group (33) generates light that passes through the second slit stop (34) and the second lens (35) and is incident on the eyeball. The light reflected by the eyeball reaches the first photoelectric sensor (32). The control module calculates the anterior chamber depth of the eyeball based on the photoelectric signal detected by the first photoelectric sensor (32).

7. The full-automatic ophthalmic optical biometer according to claim 6, characterized in that, The optical path system further includes a lens relaxation optical path, which includes a light-emitting diode (36), a scenic film (37), a first object-image lens (38), and a second object-image lens (39). The light-emitting diode (36) generates light that passes through the scenic film (37), the first object-image lens (38), and the second object-image lens (39), and is continuously reflected by the third plane mirror (17) and the fourth plane mirror (18) to the eyeball. The light reflected by the eyeball returns to the scenic film (37) along the original path. The light-emitting diode (36), the scenic film (37), and the first object-image lens (38) can move along the irradiation direction of the light-emitting diode (36).

8. The full-automatic ophthalmic optical biometer according to claim 1, wherein The Y-direction motion mechanism includes: A first stepping motor (40), which is connected to the control module; A first belt drive structure (41), which is driven by the first stepping motor (40), and the first belt drive structure (41) is connected to a first lead screw (42); A first fixed support (43), on which a first moving support (44) is slidably connected. The first moving support (44) is provided with a first lead screw nut (45), and the first lead screw (42) meshes with the first lead screw nut (45). The optical path system is arranged on the first moving support (44). A second photoelectric sensor (47) is arranged on the first fixed support (43), and a sensor light-shielding plate (48) is arranged on the first moving support (44); A first guiding optical axis (46), which is fixedly arranged on the first fixed support (43) and passes through the first moving support (44).

9. The automatic ophthalmic optical biometer according to claim 1, wherein The Z-direction motion mechanism includes: A lead screw motor (49), the output end of which has a second lead screw (50), and the lead screw motor (49) is connected to the control module; A bearing block (51), at the bottom of which a second lead screw nut (52) is slidably arranged. The second lead screw nut (52) meshes with the second lead screw (50). The second lead screw nut (52) is fixedly connected to at least two second guiding optical axes (53). The Y-direction motion mechanism is arranged on the tops of the at least two second guiding optical axes (53). A taper distance spring (56) is connected between the bearing block (51) and the lead screw motor (49); An anti-deviation optical rod (54), on the bearing block (51) there is an anti-deviation bearing block (55), and the anti-deviation bearing block (55) is sleeved on the anti-deviation optical rod (54), and the anti-deviation optical rod (54) is connected to the Y-direction motion mechanism.

10. The full-automatic ophthalmic optical biometer according to claim 1, wherein The X-direction motion mechanism includes: A second stepping motor (57), which is connected to the control module; A second belt drive structure (58), which is driven by the second stepping motor (57), and the second belt drive structure (58) is connected to a third lead screw (59); The second fixed support (60), a second moving support (62) is connected to the second fixed support (60) through a crossed roller guide (61), a third lead screw nut (63) is provided on the second moving support (62), and the third lead screw (59) meshes with the third lead screw nut (63); The full-automatic ophthalmic optical biometer further includes a base (64), the X-direction movement mechanism is arranged on the base (64), and a plurality of support blocks (65) are arranged below the base (64).

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