Optical projection module, diopter detection device and ophthalmic device

Abstract

The application is suitable for the technical field of optical inspection, and provides an optical projection module, a diopter detection device and an ophthalmic device. The optical projection module comprises a light guide, a Placido disc, a first light source, a first reflection layer and a connecting piece. The Placido disc has an outlight surface and an inlight surface. The first light source is arranged on one side or in the light guide. The light guide is arranged on the inlight surface side of the Placido disc and is used for uniformly guiding the light of the first light source to the Placido disc. The first reflection layer is used for efficiently reflecting the light of the first light source to the Placido disc in cooperation with the light guide. The connecting piece is used for connecting the light guide, the Placido disc and the first light source. The pattern light provided by the optical projection module has good brightness uniformity. When applied to the diopter detection device, the pattern light with uniform brightness can be provided to the component to be detected or the ocular tissue, and the detection accuracy of the component to be detected or the ocular tissue is improved.

Description

Technical Field

[0001] This application relates to the field of optical examination technology, and in particular to an optical projection module, a refractive power detection device, and an ophthalmic device. Background Technology

[0002] With the continuous advancement of science and technology and living standards, refractive error testing is not only used in ophthalmological examinations, but is also increasingly applied to the testing of optical components and other aspects.

[0003] A refractive power measuring device projects a geometric pattern onto the part or eye tissue to be tested through its light source, and detects the degree of deformation of the pattern reflected back by the part or eye tissue to reflect the surface morphology of the part or eye tissue to be tested.

[0004] Therefore, the uniformity of the pattern projected by the light source, especially the uniformity of brightness, directly affects the analysis and detection of the degree of pattern deformation. Existing diopter measuring devices also suffer from uneven brightness of the emitted light pattern, which affects the accuracy of diopter measurement. Utility Model Content

[0005] The purpose of this application is to provide an optical projection module, which aims to provide a solution for improving the brightness uniformity of the projected pattern and improving the accuracy of diopter detection.

[0006] This application embodiment is implemented as follows: an optical projection module includes a light guide, a plascidus disk, a first light source, a first reflective layer, and a connector. The first light source is disposed at one or more of three locations: one side of the light guide, inside the light guide, or on the plascidus disk. The light guide is disposed on one side of the light-incident surface of the plascidus disk. The light guide is used to uniformly guide the light from the first light source to the plascidus disk. The first reflective layer is used to cooperate with the light guide to efficiently reflect the light from the first light source to the plascidus disk. The connector is used to connect the light guide, the plascidus disk, and the first light source.

[0007] In some embodiments, the light guide is disposed on the optical path between the first reflective layer and the Placido disk, and the optical path is filled with a light-transmitting or light-diffusing medium; the first light source is disposed on one side or inside the light guide or on the Placido disk, including the first light source being disposed at one or more of the following locations: the light-emitting surface of the light guide, the light-incident surface of the light guide, the inner side of the light guide, the outer side of the light guide, the interior of the light guide, the outer side of the Placido disk, and the inner side of the Placido disk.

[0008] In some embodiments, the light guide is a closed ring in the direction surrounding the optical axis, or the light guide is a ring with a notch, or the light guide includes a plurality of spaced sub-light guides, with adjacent sub-light guides spaced apart or at least two adjacent sub-light guides being at least partially connected.

[0009] And / or, in the radial direction of the light guide, the light guide includes a plurality of sub-sections, with adjacent sub-sections spaced apart or at least two adjacent sub-sections being at least partially connected.

[0010] In some embodiments, the surface and / or interior of the light guide are provided with scattering structures, and the surface of the light guide includes at least one of the surface facing the Placid disk, the surface facing the first reflective layer, and the side surface of the light guide.

[0011] In some embodiments, the scattering structure of the light guide satisfies at least one of the following:

[0012] The scattering structure includes a bump structure, which is at least one of the following: a bump integrally injection molded with the light guide, a laser-processed bump, or a bump integrally molded with the light guide.

[0013] The scattering structure includes a concave structure, which is at least one of the following: a concave structure integrally injection molded with the light guide, a laser-processed concave structure, and a concave structure integrally molded with the light guide.

[0014] The scattering structure includes a mesh structure, which includes multiple intersecting meshes. The meshes include at least one of the following: a mesh integrally rolled with the light guide, a mesh integrally molded with the light guide, a mesh integrally injection molded with the light guide, and a laser-processed mesh.

[0015] The scattering structure includes a groove structure, which includes multiple grooves. The grooves are arranged in a regular, irregular, or combination thereof. The extension direction of the grooves includes at least one of straight lines, arcs, spirals, and zigzags. The grooves are formed by at least one of injection molding, compression molding, laser processing, roll forming, and mechanical cutting.

[0016] The light guide is a double-substrate sandwich structure, comprising two substrates arranged opposite each other, with an optical path modulation structure between the substrates, the optical path modulation structure including periodic or non-periodic optical structures.

[0017] In some embodiments, the Placid disk includes a light-transmitting disk body and a plurality of opaque annular structures. The plurality of opaque annular structures are distributed at intervals in a concentric or approximately concentric manner. The opaque annular structures are disposed on at least one side and / or inside the disk body. The at least one side includes a side away from the light guide and a side facing the light guide. The portion of the disk body corresponding to the space between the opaque annular structures serves as a light-transmitting area.

[0018] In some embodiments, at least one side of the disk body is provided with a plurality of concentric or nearly concentric and spaced recessed structures, the at least one side including a side away from the light guide and a side facing the light guide, and at least a portion of the non-transparent annular structure is disposed within the recessed structure in the thickness direction of the disk body.

[0019] Alternatively, the disk body may not have a recessed structure, and the disk body may include an integrally formed light-transmitting area and a non-light-transmitting annular structure.

[0020] Alternatively, the disk body may not have a recessed structure, and the non-transparent structure may satisfy one or more of the following combinations:

[0021] Including spray coating;

[0022] Including electroplating;

[0023] Including physical vapor deposition layers;

[0024] Including chemical vapor deposition layers;

[0025] Including the printed layer;

[0026] Including the adhesive film layer;

[0027] It includes a discrete structure spaced apart from the disk body, the discrete structure including at least one of a metal plate layer, a discrete film layer, and a microstructure layer, the microstructure layer having concave and convex microstructures for absorbing light;

[0028] It includes a doped layer formed by double injection molding with the disk body, wherein the doped layer is doped with light-absorbing particles.

[0029] In some embodiments, the optical projection module satisfies at least one of the following:

[0030] The light-emitting surface of the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

[0031] The incident surface of the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

[0032] The surface of the light guide facing the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

[0033] The surface of the light guide away from the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

[0034] In some embodiments, the first reflective layer satisfies one or more of the following:

[0035] Including spray coating;

[0036] Including electroplating;

[0037] Including physical vapor deposition layers;

[0038] Including chemical vapor deposition layers;

[0039] Including the printed layer;

[0040] Including the adhesive film layer;

[0041] The reflector is provided at intervals from the Plassey disc. The reflector includes at least one of a plate layer with reflective properties, a discrete film layer, and a microstructure layer. The microstructure layer is provided with concave and convex microstructures for reflection.

[0042] It includes a doped layer formed by double injection molding with the light guide, wherein the doped layer is doped with reflective particles.

[0043] In some embodiments, the wavelength of the first light source includes at least one of the red light band, green light band, blue light band, infrared light band, and ultraviolet light band; the first light source includes at least one of the light-emitting diode, organic light-emitting diode, and laser light source.

[0044] In some embodiments, the shape of the light-emitting area of ​​the first light source includes at least one of the following: dot-shaped, line-shaped, surface-shaped, ring-shaped, array-shaped, segmented combination-shaped, or irregular shape.

[0045] In some embodiments, the connector is in the form of a closed ring, the connector is provided with a slot, and the radial outer edge of the Placid disk, the radial outer edge of the light guide and at least a portion of the light source are all located in the slot.

[0046] In some embodiments, the placid disk and the light guide are integrally formed, the disk body of the placid disk is part of the light guide, and the non-transparent annular structure is disposed on the light guide.

[0047] Another objective of this application is to provide a refractive power measurement device, which includes an optical projection module as described in the above embodiments.

[0048] Another objective of this application is to provide an ophthalmic device comprising:

[0049] The refractive power measurement device described in the above embodiments is used to acquire surface morphology or refractive power information of ocular tissues; and

[0050] An optical scanning system for acquiring structural image data of ocular tissues, wherein the optical scanning system includes at least one of an OCT scanning system and an ultrasound scanning system.

[0051] The optical projection module, refractive power detection device, and ophthalmic device provided in this application have the following advantages:

[0052] The optical projection module provided in this application uses a light guide to uniformly guide the light from the first light source to the Plassido disk, dispersing the light radially and circumferentially. This improves the light emission uniformity of the Plassido disk, resulting in patterned light with excellent brightness uniformity provided by this novel Plassido disk. When applied in a refractive power measurement device, this optical projection module can provide uniformly bright patterned light to the part being measured or ocular tissue, thus improving the accuracy of refractive power measurement. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a three-dimensional perspective view of the optical projection module provided in the embodiments of this application;

[0055] Figure 2 This is another perspective view of the optical projection module provided in the embodiments of this application;

[0056] Figure 3 This is a front view of the optical projection module provided in the embodiments of this application;

[0057] Figure 4This is a cross-sectional view of an optical projection module provided in an embodiment of this application;

[0058] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0059] Figure 6 This is another cross-sectional view of the optical projection module provided in the embodiments of this application;

[0060] Figure 7 This is another cross-sectional view of the optical projection module provided in the embodiments of this application;

[0061] Figure 8 This is a schematic diagram of the structure of the light guide component of the optical projection module provided in the embodiments of this application. Figure 1 ;

[0062] Figure 9 This is a schematic diagram of the structure of the light guide component of the optical projection module provided in the embodiments of this application. Figure 2 ;

[0063] Figure 10 This is a schematic diagram of the structure of the light guide component of the optical projection module provided in the embodiments of this application. Figure 3 ;

[0064] Figure 11 This is a schematic diagram of the structure of the light guide component of the optical projection module provided in the embodiments of this application. Figure 4 ;

[0065] Figure 12 This is a schematic diagram of the forward viewing angle of the optical projection module provided in the embodiments of this application;

[0066] Figure 13 This is a schematic diagram of the optical path of the optical projection module provided in the embodiments of this application;

[0067] Figure 14 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the first revolution of the Placid disk provided in the embodiments of this application;

[0068] Figure 15 This is a simulated diagram of the light intensity emitted from the optical projection module corresponding to the second ring of the Placidor disk provided in the embodiments of this application;

[0069] Figure 16 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the third ring of the Placid disk provided in the embodiments of this application;

[0070] Figure 17 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the fourth ring of the Placidor disk provided in the embodiments of this application;

[0071] Figure 18This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 5th ring of the Placid disk provided in the embodiments of this application;

[0072] Figure 19 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 6th ring of the Placidor disk provided in the embodiments of this application;

[0073] Figure 20 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 7th ring of the Placid disk provided in the embodiments of this application;

[0074] Figure 21 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 8th ring of the Placid disk provided in the embodiments of this application;

[0075] Figure 22 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 9th ring of the Placidor disk provided in the embodiments of this application;

[0076] Figure 23 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 10th rotation of the Placid disk provided in the embodiments of this application;

[0077] Figure 24 This is a simulated image of the light intensity emitted from the optical projection module corresponding to the 11th ring of the Placid disk provided in the embodiments of this application;

[0078] Figure 25 This is a schematic diagram of the refractive power measurement device provided in the embodiments of this application;

[0079] Figure 26 This is a schematic diagram of the structure of the ophthalmic device provided in the embodiments of this application;

[0080] Figure 27 It is the mathematical model of a single-image Plassidio disk;

[0081] Figure 28 This is a schematic diagram of the virtual image's position;

[0082] Figure 29 This is a schematic diagram of a virtual image projection.

[0083] The markings in the diagram mean:

[0084] 200 - Ophthalmic equipment; 100 - Refractive power testing equipment;

[0085] 11-Optical projection module, 110-Center hole, 111-Plasido disk, 1111-Transparent area, 1112-Non-transparent area, 1113-Disk body, 11130-Recessed structure, 1114-Non-transparent ring structure, 112-Light guide;

[0086] 11202 - Groove structure, 11203 - Concave structure, 11206 - Convex structure;

[0087] 1122-First reflective layer, 1125-Sub-light guide, 113-First light source, 114-Connector, 1140-Slot, 1141-First connecting part, 1142-Second connecting part, 1143-Fasting element;

[0088] 115-Second light source; 116-Gap; 12-Imaging module; 13-Optical scanning system; 14-Beam splitting component; X-Optical axis. Detailed Implementation

[0089] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0090] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly fixed to or set on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this patent. The terms "first" and "second" are used only for the purpose of description and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly specified.

[0091] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between the related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be single or multiple. Furthermore, in the description of this application, "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, and c can represent: a, b, c, a+b, a+c, b+c, a+b+c, where a, b, and c can be single or multiple. As another example, at least one of a, b, or c can represent: a, b, c, a+b, a+c, b+c, a+b+c, where a, b, and c can be single or multiple.

[0092] To illustrate the technical solutions described in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0093] In some embodiments of this application, such as Figures 1 to 4 As shown, this application embodiment first provides an optical projection module 11, including a light guide 112, a plascidos disk 111, a first light source 113, and a first reflective layer 1122. The plascidos disk 111 has a light-emitting surface and a light-incident surface. The first light source 113 is disposed in one or more of three positions: on one side of the light guide 112, inside the light guide 112, or on the plascidos disk 111. The light guide 112 is disposed on one side of the light-incident surface of the plascidos disk 111. The light guide 112 is used to uniformly guide the light from the first light source 113 to the plascidos disk 111. The first reflective layer 1122 is used to cooperate with the light guide 112 to efficiently reflect the light from the first light source 113 to the plascidos disk 111.

[0094] The optical projection module 11 provided in this embodiment uses a light guide 112 to disperse the light from the first light source 113 in the radial and circumferential directions of the Plassid disk 111, thereby improving the light emission uniformity of the Plassid disk 111. Consequently, the patterned light provided by the optical projection module 11 has good brightness uniformity. When applied to a refractive power measurement device 100, this optical projection module 11 can provide uniformly bright patterned light to the part to be measured or ocular tissue, which is beneficial for improving the accuracy of refractive power measurement.

[0095] The eye tissues mentioned include, but are not limited to, the cornea, lens, and retina.

[0096] like Figure 5As shown, in some embodiments of this application, the optical projection module 11 further includes a connector 114 for connecting the light guide 112, the placid disk 111 and the first light source 113, so as to fix the placid disk 111, the light guide 112 and the first light source 113 into one unit.

[0097] In some embodiments, the optical projection module 11 has a centrally rotationally symmetric structure, and its rotation axis also serves as its optical axis X, such as... Figure 4 As shown, the plassiding 111 has a light-emitting surface and a light-receiving surface, and a light guide 112 is disposed on the light-receiving surface side of the plassiding 111. A first light source 113 is disposed close to the light guide 112 and emits light toward the light guide 112. In this way, the light guide 112 uniformly guides the light from the first light source 113 to the plassiding 111, so as to obtain the desired patterned light from the light-emitting surface side of the plassiding 111.

[0098] In the radial direction of the plassiding 111, the light guide 112 can uniformly disperse the light from the first light source 113. Similarly, in the circumferential direction of the plassiding 111, the light guide 112 can also uniformly disperse the light from the first light source 113. Thus, a uniform surface light source can be formed on one side of the light-emitting surface of the plassiding 111. The patterned light emitted from the light-emitting surface of the plassiding 111 exhibits good brightness uniformity.

[0099] The first light source 113 is disposed in one or more of the following three locations: one side of the light guide 112, one inside the light guide 112, or one placid disk 111. This includes the first light source 113 being disposed in one or more of the following locations: the light emitting surface of the light guide 112, the light receiving surface of the light guide 112, the inner side of the light guide 112, the outer side of the light guide 112, the inner side of the light guide 112, the outer side of the placid disk 111, and the inner side of the placid disk 111.

[0100] The light emission direction of the first light source 113 can be selected to be towards the plassiding disk 111. The light from the first light source 113 can pass at least partially through the plassiding disk 111 before being directly or intermittently incident into the light guide 112.

[0101] Here are a few examples of the position of the first light source 113.

[0102] In some embodiments, such as Figure 4 and Figure 5 As shown, the first light source 113 is located on the outer side of the light guide 112, where "outer side" refers to the side away from the Placido disk 111. Optionally, as... Figure 4 and Figure 5As shown, the first light source 113 is disposed on the side of the light guide 112 opposite to the plascidos disk 111 along the optical axis X, and located at the radial outer edge of the light guide 112. The light from the first light source 113 diffuses radially from the outside to the inside. The purpose of this arrangement is that, on the one hand, the first light source 113 does not need to occupy the space between the light guide 112 and the plascidos disk 111, and will not increase the width of the gap 116; on the other hand, it facilitates the routing and maintenance of the first light source 113.

[0103] In other alternative embodiments, the first light source 113 is disposed at the radial inner edge of the light guide 112 and on the side opposite to the Placido disk 111 along the optical axis X. The light from the first light source 113 diffuses radially from the inside to the outside.

[0104] like Figure 6 As shown, the first light source 113 is located on the outer side of the plassiding disk 111, where "outer side" refers to the side of the plassiding disk 111 away from the light guide 112. At this time, the first light source 113 emits light towards the plassiding disk 111. After passing through the plassiding disk 111, the light enters the light guide 112, where it is diffused and dispersed before entering the plassiding disk 111.

[0105] Optionally, the first light source 113 is located outside the plassiding disk 111 and at the radial outer edge of the plassiding disk 111. In this way, the light emitted by the first light source 113 can be basically separated from the pattern light formed by the plassiding disk 111 and do not affect each other.

[0106] In other alternative embodiments, the first light source 113 is disposed on the inner side of the plassiding disk 111, where the inner side refers to the side of the plassiding disk 111 closest to the light guide 112. The first light source 113 can be directly or indirectly fixed to the surface of the plassiding disk 111 closest to the light guide 112, and emit light directly or intermittently through the light guide medium toward the light guide 112.

[0107] like Figure 7 As shown, the first light source 113 is disposed inside the light guide 112. The first light source 113 is disposed inside the light guide 112 and emits light toward or away from the plassid disk 111.

[0108] The first light source 113 can be embedded within the light guide 112 during the injection molding process. Alternatively, the first light source 113 can be sandwiched between two parts of the light guide 112 along the optical axis X. Further optionally, the first light source 113 can be distributed as evenly as possible in the circumferential and / or radial directions of the light guide 112; for example, the first light source 113 can be distributed in a concentric ring array in the circumferential and radial directions of the light guide 112.

[0109] The light emission direction of the first light source 113 can be selected to be toward the light guide 112. Specifically, this includes the first light source 113 emitting light directly toward the light guide 112, or the first light source 113 emitting light indirectly toward the light guide 112 through the guidance of other optical elements.

[0110] The number of first light sources 113 is unlimited; there can be one or more. Optionally, they can provide as uniform illumination as possible in the direction around the optical axis X.

[0111] In some embodiments, the number of first light sources 113 is one. Optionally, the first light source 113 is a ring light source, disposed around the optical axis X.

[0112] In some embodiments, there are multiple first light sources 113. Optionally, the multiple first light sources 113 are evenly distributed around the optical axis X. For example, there are two first light sources 113, which may be semi-circular or nearly semi-circular light sources. Alternatively, there may be more than one first light source 113, such as 10, 20, or 30.

[0113] The shape of the luminous area of ​​the first light source 113 includes at least one of the following: point-like, line-like, surface-like, ring-like, array-like, segmented combination-like, or irregular shape. For example, the luminous area of ​​the first light source 113 is ring-like; or the luminous area of ​​the first light source 113 is array-like, such as a two-dimensional rectangular array; or the number of first light sources 113 is multiple, and the luminous area of ​​each first light source 113 is surface-like; or some of the luminous areas of the first light sources 113 are point-like, and some of the luminous areas of the first light sources 113 are irregular; or some of the luminous areas of the first light sources 113 are array-like, and some of the luminous areas of the first light sources 113 are segmented combination-like.

[0114] like Figures 1 to 4 As shown, the plascidospheric disk 111 has a central aperture 110 extending along the optical axis X. This central aperture 110 allows patterned light reflected by the component to be tested or ocular tissue to pass through. In the refractive power measurement device 100, the patterned light reflected by the component to be tested or ocular tissue passes through the plascidospheric disk 111 and is received by the imaging module 12. Here, please refer to... Figure 25 As shown.

[0115] like Figures 1 to 4 As shown, the light-emitting surface of the Plassido disk 111 is a concave surface that is recessed along the optical axis X, and the light-emitting surface of the Plassido disk 111 is a convex surface that protrudes along the optical axis X. Thus, the light-emitting surface and the light-incident surface of the Plassido disk 111 are not planes perpendicular to the optical axis X, and the Plassido disk 111 is horn-shaped as a whole.

[0116] It should be noted that, in the above-mentioned light-emitting surface that is concave along the X-axis and light-incident surface that is convex along the X-axis, "convex" and "concave" are based on the solid structure.

[0117] like Figure 1 , Figure 4 and Figure 5 As shown, the plascidos disk 111 has multiple concentric, alternating light-transmitting areas 1111 and opaque areas 1112 arranged radially on the plascidos disk 111. Both the light-transmitting areas 1111 and opaque areas 1112 are concentrically arranged with the central aperture 110. Light emitted from the first light source 113 passes through the plascidos disk 111 and is transmitted towards the component to be tested or the eye tissue. Some light is transmitted through the light-transmitting areas 1111, while the remaining light is blocked by the opaque areas 1112. Thus, a black and white concentric striped structured light is obtained on the light-emitting surface of the plascidos disk 111.

[0118] In some embodiments, the sum of the number of light-transmitting areas 1111 and non-light-transmitting areas 1112 on the plassido disc 111 can be 6 to 108. Optionally, the sum of the number of light-transmitting areas 1111 and non-light-transmitting areas 1112 on the plassido disc 111 can be 12 to 84. Optionally, the sum of the number of light-transmitting areas 1111 and non-light-transmitting areas 1112 on the plassido disc 111 can be 12 to 48.

[0119] The formation of the light-transmitting area 1111 and the non-light-transmitting area 1112 on the Plassido disc 111 is not limited.

[0120] For example, please see Figure 5 As shown, in some embodiments of this application, the Placido disk 111 includes a disk body 1113 and a plurality of concentric or nearly concentric and spaced-apart opaque annular structures 1114 disposed on the light-emitting surface of the disk body 1113. The disk body 1113 of the Placido disk 111 is an integral light-transmitting element, and the opaque annular structures 1114 are opaque elements. Thus, the portion of the disk body 1113 of the Placido disk 111 corresponding to the opaque annular structures 1114 serves as a light-transmitting area 1111, and at least the opaque annular structures 1114 constitute an opaque area 1112. For example, the portion of the disk body 1113 of the Placido disk 111 corresponding to the opaque annular structures 1114 and the corresponding opaque annular structures 1114 can together serve as the opaque area 1112.

[0121] Multiple opaque annular structures 1114 are distributed at intervals in a concentric or nearly concentric manner. The opaque annular structures 1114 may be disposed on at least one side or inside the disk body 1113. The at least one side of the disk body 1113 includes the side of the disk body 1113 away from the light guide 112 and the side facing the light guide 112.

[0122] The form of the opaque annular structure 1114 is not limited; for example, it can be an opaque layer, such as an opaque spray coating or an opaque adhesive film. The opaque layer blocks a portion of the disc body 1113 of the Placidor disc 111, thereby forming an opaque area 1112. For example, if the opaque layer is an opaque spray coating, it can be removed by mechanical processing after spraying an opaque material onto the surface of the disc body 1113 facing the part to be tested or the anterior segment of the eye, following a concentric stripe pattern.

[0123] In other embodiments, the non-transparent annular structure 1114 may also be an opaque strip material component, etc.

[0124] In other words, adjacent light-transmitting areas 1111 are connected on the side of the non-light-transmitting area 1112 facing the light guide 112. The Plassid disk 111 can form a ring-shaped, integrated light-transmitting structure by connecting its multiple light-transmitting areas 1111, with multiple non-light-transmitting areas 1112 positioned on the light-emitting side of the light-transmitting area 1111. This arrangement facilitates the fixed connection between the light-transmitting areas 1111 and the non-light-transmitting areas 1112.

[0125] For example, the surfaces of the disk body 1113 and the non-transparent annular structure 1114 that are close to each other can be fixedly connected together by means of adhesive, integral injection molding, etc.

[0126] In some alternative embodiments, such as Figure 4 and Figure 5 As shown, at least one side of the disk body 1113 is provided with a plurality of concentric or nearly concentric recessed structures 11130 arranged at intervals. In the thickness direction of the disk body 1113, at least a portion of each non-transparent annular structure 1114 is correspondingly disposed within the recessed structure 11130. The purpose of this arrangement is that the recessed structure 11130 can be used to fix the non-transparent annular structure 1114, and can also make the light-emitting surface side of the Placidor disk 111 relatively flat (this does not refer to a flat plane, but rather that the non-transparent annular structure 1114 does not protrude significantly).

[0127] In some embodiments, the depth of the recessed structure 11130 is equal to the thickness of the opaque annular structure 1114. Thus, the opaque annular structure 1114 can be precisely filled within the recessed structure 11130. In the thickness direction of the plassid disk 111, the light-transmitting area 1111 and the side of the opaque area 1112 facing away from the light guide 112 remain flush.

[0128] In some embodiments of this application, the Placidor disc 111 is an injection-molded part. The disc body 1113 and the opaque annular structure 1114 are formed into an integral injection-molded part by two-color injection molding.

[0129] In some embodiments, the disk body 1113 may not need to have a recessed structure, and the disk body 1113 includes an integrally formed light-transmitting area 1111 and a non-light-transmitting annular structure 1114 (non-light-transmitting area 1112). Alternatively, the non-light-transmitting annular structure 1114 is a portion of the non-light-transmitting structure on the integrally formed disk body 1113.

[0130] In some embodiments, the disc body 1113 may not require a recessed structure. The non-transparent annular structure 1114 satisfies one or more of the following combinations:

[0131] The opaque annular structure 1114 includes one or more of the following: a sprayed layer, an electroplated layer, a physical vapor deposition layer, a chemical vapor deposition layer, a printed layer, an adhesive film layer, a discrete structure, and a doped layer integrated with the disk body 1113. When the opaque annular structure 1114 includes multiple of the following: a sprayed layer, an electroplated layer, a physical vapor deposition layer, a printed layer, an adhesive film layer, a discrete structure, and a doped layer integrated with the disk body 1113, the opaque annular structure 1114 can be a side-by-side combination of these multiple structures, or a stacked combination of these multiple structures.

[0132] The spray coating refers to the coating formed on the surface of the disk body 1113 by spraying. For example, the spray coating can be a black or silver paint layer, etc.

[0133] An electroplated layer refers to a film layer formed on the surface of the disk body 1113 by electrochemical plating. For example, the electroplated layer can be one or more of the following: a gold layer, a silver layer, and an aluminum layer.

[0134] A physical vapor deposition layer refers to a film layer formed on the surface of the disk body 1113 by physical vapor deposition. For example, a physical vapor deposition layer can be one or more of the following: a gold layer, a silver layer, and an aluminum layer.

[0135] The chemical vapor deposition layer mentioned is not limited. For example, chemical vapor deposition layers can include metal oxide layers, metal carbide layers, etc.

[0136] The printed layer refers to a material layer formed on the surface of the disk body 1113 by printing. For example, the printed layer can be a black ink layer, etc.

[0137] The adhesive film refers to a film layer that is applied to the surface of the disk body 1113 by means of adhesive. For example, the adhesive film layer can be an optical interference reflective film, a protective reflective film, etc.

[0138] The discrete structure connected to the disk body 1113 refers to a structure that is manufactured independently of the disk body 1113 and is installed or connected to the light-emitting side of the disk body 1113. For example, the discrete structure may include at least one of a metal plate layer, a discrete film layer, and a microstructure layer. The microstructure has concave and convex microstructures for light absorption to absorb light as much as possible and form a black ring pattern.

[0139] The doped layer integrally formed with the disk body 1113 through two-color injection molding refers to the doped layer that is integrally formed with the disk body 1113 through two-color injection molding. The doped layer contains light-absorbing particles. These light-absorbing particles may include black particles, etc.

[0140] In some embodiments, the opaque annular structure 1114 includes multiple layers such as a sprayed layer, an electroplated layer, a physical vapor deposition layer, a printed layer, an adhesive film layer, a discrete structure, and a doped layer integral with the disk body 1113. For example, the opaque annular structure 1114 may sequentially include a microstructure layer and an electroplated layer, or the opaque annular structure 1114 may sequentially include an optical interference reflective film and a sprayed layer, or the opaque annular structure 1114 may sequentially include a doped layer and an electroplated layer integrally injection molded with the disk body 1113 in two colors, etc.

[0141] In other alternative embodiments, the thickness of the light-transmitting area 1111 and the non-light-transmitting area 1112 can be the same, and the light-transmitting area 1111 and the non-light-transmitting area 1112 are connected side by side in the radial direction of the Plassid disk 111.

[0142] In some embodiments, the light transmittance of the light-transmitting area 1111 is greater than or equal to 70%. Optionally, the light transmittance of the light-transmitting area 1111 is greater than or equal to 80%. The light transmittance of the light-transmitting area 1111 is greater than or equal to 85%. The light transmittance of the light-transmitting area 1111 is greater than or equal to 90%. The light transmittance of the light-transmitting area 1111 is greater than or equal to 95%.

[0143] In some embodiments, the transmittance of the non-transparent area 1112 is less than or equal to 30%. Optionally, the transmittance of the non-transparent area 1112 is less than or equal to 20%. Optionally, the transmittance of the non-transparent area 1112 is less than or equal to 15%. Optionally, the transmittance of the non-transparent area 1112 is less than or equal to 10%. Optionally, the transmittance of the non-transparent area 1112 is less than or equal to 5%.

[0144] In this optical projection module 11, the first light sources 113 are uniformly distributed around the optical axis X. This ensures that the light-emitting surface of the plassid disk 111 receives a uniform surface light source. The specific number of the first light sources 113 can be determined based on the size of the first light sources 113 and the size of the plassid disk 111.

[0145] In some embodiments, the size of the first light source 113 can be set to be relatively small, so that more first light sources 113 can be arranged in the direction around the optical axis X, thereby ensuring the uniformity of light output of the optical projection module 11. For example, in some optional embodiments, the size of the first light source 113 can be set such that its length, width, and height do not exceed 4 mm. For example, in some cases, the size of the first light source 113 can be 2.8 mm × 3.5 mm × 0.8 mm.

[0146] In some embodiments, the number of first light sources 113 is greater than or equal to 20. This ensures that the first light sources 113 are as close as possible to each other, guaranteeing uniform light output. In some optional embodiments, the number of first light sources 113 is greater than or equal to 20. In some optional embodiments, the number of first light sources 113 is greater than or equal to 30. In some optional embodiments, the number of first light sources 113 is greater than or equal to 40. In some optional embodiments, the number of first light sources 113 is greater than or equal to 50. In some optional embodiments, the number of first light sources 113 is greater than or equal to 60. In some optional embodiments, the number of first light sources 113 is greater than or equal to 70, etc. In some optional embodiments, the number of first light sources 113 is greater than or equal to 80.

[0147] In some specific embodiments, the number of first light sources 113 is 20, 24, 30, 36, 40, 60, 90, etc.

[0148] In some embodiments, the first light source 113 has a wavelength band that covers at least one of commonly used optical communication wavelength bands, visual perception-related wavelength bands, etc.

[0149] Optionally, the wavelength of the first light source 113 is 400 nm to 780 nm. In some optional embodiments, the wavelength of the first light source 113 is 630 nm to 780 nm.

[0150] In other optional embodiments, the wavelength of the first light source 113 can also be other wavelengths. For example, the wavelength of the first light source 113 can be the blue light band, or the wavelength of the first light source 113 can be the green light band, or the wavelength of the first light source 113 can also be the infrared band, or the wavelength of the first light source 113 can also be the ultraviolet band. In some optional embodiments, the wavelength of the first light source 113 may simultaneously include multiple of the aforementioned red light band, green light band, blue light band, infrared band, and ultraviolet band.

[0151] The type of the first light source 113 is not limited. The first light source 113 employs at least one of the following devices capable of generating coherent or incoherent light output and possessing light emission functionality. For example, the first light source 113 can be a light-emitting diode, an organic light-emitting diode, or a laser source, or a combination of multiple light-emitting diodes, organic light-emitting diodes, and laser sources. The laser source may include at least one of a vertical-cavity surface-emitting laser and an edge-emitting semiconductor laser.

[0152] like Figure 3 and Figure 4 As shown, in some embodiments, the optical projection module 11 further includes a plurality of second light sources 115, which are disposed on the plascid disk 111 and emit light toward the anterior segment of the eye. The second light sources 115 are used to measure the size of the pupil.

[0153] The second light source 115 has a wavelength range of 780 nm to 1000 nm. In some optional embodiments, the wavelength range of the second light source 115 is 900 nm to 1000 nm. The wavelength range of the second light source 115 only needs to be distinguishable from that of the first light source 113.

[0154] In one specific embodiment, the optical projection module 11 includes 12 second light sources 115 in the 940nm band (near-infrared band), which are uniformly or non-uniformly arranged in the direction around the optical axis X, and are mounted on the Plassid disk 111 by through-hole or patch mounting.

[0155] In some embodiments of this application, the light guide 112 is disposed on the optical path between the first reflective layer 1122 and the Placido disk 111, and the optical path is filled with a medium. The medium may be a light-scattering medium for scattering light, or the medium may be a light-transmitting medium that does not require scattering light and allows light to propagate.

[0156] In some embodiments of this application, such as Figure 2 and Figure 4 As shown, the light guide 112 is a closed ring in the direction surrounding the optical axis X. The surfaces of the light guide 112 facing the plassiding disk 111 and away from the plassiding disk 111 are both continuously arranged around the optical axis X.

[0157] like Figures 9 to 10 As shown, in some embodiments of this application, the surface and / or interior of the light guide 112 are provided with scattering structures. The surface of the light guide 112 includes at least one of the surface facing the plassid disk 111, the surface of the light guide 112 away from the plassid disk 111, and the side surface of the light guide 112. The scattering structures are used to further scatter and homogenize the light, so that the light is further evenly distributed circumferentially and / or radially within the light guide 112.

[0158] Scattering structures can take many forms.

[0159] In some embodiments, the scattering structure includes one or a combination of convex structures 11206, concave structures 11203, mesh structures, and trench structures. When the scattering structure includes multiple types of convex structures 11206, concave structures 11203, mesh structures, and trench structures, the scattering structure can be a side-by-side combination of multiple types of convex structures 11206, concave structures 11203, mesh structures, and trench structures on the upper surface of the light guide 112, or it can be a stacked combination of multiple types of convex structures 11206, concave structures 11203, mesh structures, and trench structures.

[0160] The aforementioned bump structure 11206 can be a bump integrally injection molded with the light guide 112. For example, during the injection molding of the light guide 112, recessed points are correspondingly provided on the inner wall surface of the mold to obtain a light guide 112 with bumps on its surface. Alternatively, the aforementioned bump structure 11206 can be a bump integrally molded with the light guide 112. Alternatively, the aforementioned bump structure 11206 can be a micro-bump obtained by laser processing on the surface of the light guide 112. Or, the aforementioned bump structure 11206 can be a combination of the above-mentioned factors, such as a combination of a bump integrally injection molded with the light guide 112 and a micro-bump obtained by laser processing.

[0161] The convex structure 11206 can be disposed on the surface of the light guide 112 facing away from the plassid disk 111, used to change the propagation path of light within the light guide 112, causing the light incident on the convex structure 11206 to be scattered and reflected in multiple directions, thereby making the light uniformly distributed within the light guide 112. The convex structure 11206 can also be disposed on the surface of the light guide 112 facing the plassid disk 111, used for reflecting and scattering light, and can also be used to break total internal reflection, allowing light to exit and improving light emission efficiency. The convex structure 11206 can also be disposed inside the light guide 112, used to disperse and homogenize light within the light guide 112.

[0162] The diameter of the convex structure 11206 can be from 5 micrometers to 50 micrometers. On the light guide 112, the convex structure 11206 can be arranged with a high density at the edges and a low density at the center.

[0163] like Figure 8 and Figure 10As shown, the light guide 112 has raised structures 11206 on both opposite sides of its surface. The raised structures 11206 on both sides can be the same shape or different shapes. For example, the raised structures 11206 can be columnar, spherical, ellipsoidal, conical, wedge-shaped, etc.

[0164] like Figure 11 As shown, the recessed structure 11203 can be a recessed point integrally injection molded with the light guide 112. For example, when injection molding the light guide 112, a light guide 112 with recessed points on its surface is obtained by correspondingly setting raised points on the inner wall surface of the mold. Alternatively, the recessed structure 11203 can be a tiny recessed point obtained by laser processing on the surface of the light guide 112. Alternatively, the recessed structure 11203 can be a recessed point integrally molded with the light guide 112. Or, the recessed structure 11203 can be a combination of the above-mentioned types, specifically a combination of a recessed point integrally injection molded with the light guide 112 and a tiny recessed point obtained by laser processing.

[0165] The concave structure 11203 can be disposed on opposite sides of the light guide 112 to reflect and refract light. Furthermore, for the concave structure 11203 disposed on the light-emitting surface of the light guide 112, some light can be directly refracted and emitted from the concave structure 11203. By adjusting the depth and distribution density of the concave structure 11203, uniform light emission and high light emission efficiency can be achieved from the light guide 112.

[0166] The concave structure 11203 can also be provided inside the light guide 112 to disperse and homogenize the light within the light guide 112.

[0167] The concave structure 11203 can be disposed on the opposite two side surfaces and / or inside the light guide 112. The concave structures 11203 at different locations can have the same shape or different shapes. For example, the concave structure 11203 can be columnar, spherical, ellipsoidal, conical, wedge-shaped, etc.

[0168] The aforementioned mesh structure includes multiple intersecting meshes. Specifically, the mesh may include a mesh integrally roll-formed with the light guide 112; for example, the surface of a metal roller may have a mesh pattern, and the roll-formed mesh may be integrally formed on the light guide 112 through roll forming. Alternatively, the mesh may include a mesh integrally molded with the light guide 112. Alternatively, the mesh may include a laser-processed mesh, that is, a mesh formed on the light guide 112 through laser processing. Alternatively, the mesh may be an integrally injection-molded mesh with the light guide 112. Or, the aforementioned mesh structure may include a combination of several of the above, such as a combination of integrally roll-formed mesh, laser-processed mesh, and integrally injection-molded mesh.

[0169] The aforementioned mesh structure consists of intersecting, for example, perpendicular meshes. The line width of the mesh can be 10 micrometers to 50 micrometers, and the spacing can be 0.1 micrometers to 1 millimeter. When light propagates within the light guide 112 to the edge of the mesh, reflection and scattering occur, thereby further dispersing and unifying the light within the light guide 112. In some embodiments, the regular distribution of the mesh disperses the light in both the horizontal and vertical directions, reducing directional deviations in light intensity.

[0170] like Figure 9 As shown, the trench structure 11202 includes multiple trenches. The multiple trenches can be arranged in a regular distribution, an irregular distribution, or a combination of both.

[0171] The extension direction of the grooves includes at least one of the following: straight line, arc, spiral, and zigzag. For example, multiple straight-line extending grooves are arranged in parallel, specifically along the circumference of the light guide 112, or along the radial direction of the light guide 112, or along other directions. Alternatively, multiple arc-line extending grooves are evenly distributed circumferentially. Another example is multiple straight-line extending grooves arranged radially, etc. Many other forms will not be listed here.

[0172] The groove structure 11202 may include a groove integrally formed on the light guide 112 by injection molding. Alternatively, the groove structure 11202 may include a groove formed on the light guide 112 by laser processing. Alternatively, the groove structure 11202 may include a groove formed on the light guide 112 by mechanical cutting. Alternatively, the groove structure 11202 may include a groove formed on the light guide 112 by molding. Alternatively, the groove structure 11202 may include a groove formed on the light guide 112 by roll forming. Alternatively, the groove structure 11202 may include a combination of multiple of the aforementioned forming methods.

[0173] The cross-section of the trench is not limited; it can be trapezoidal, V-shaped, U-shaped, rectangular, or other shapes, without particular limitation. In some specific embodiments, as shown in the figure, the cross-section of the trench is V-shaped, and the angle of the inner sidewall of the trench is 30° to 60°.

[0174] In some alternative embodiments, the depth of the trenches can be 50 micrometers to 2000 micrometers, and the spacing can be 0.5 millimeters to 2 millimeters.

[0175] The inclined inner wall of the groove reflects light, changing the direction of the light that originally traveled along the length of the groove, thus dispersing the light within the light guide 112.

[0176] In some alternative embodiments, the depth of the trench increases with the distance from the first light source 113 to enhance the reflection of light at a location farther from the first light source 113.

[0177] In some embodiments, the light guide 112 is a double-substrate sandwich structure, comprising at least two opposing substrates. A light-transmitting medium, such as air or an inert gas, with a refractive index different from that of the substrates, is filled between the opposing substrates. When light propagates within the substrates and in the cavity between them, the difference in refractive index allows the light to be uniformly dispersed between the substrates and emitted from the substrates toward the Plassid disk 111. For example, the refractive index of air or an inert gas is approximately 1, and the substrate material can be PMMA, which has a refractive index of 1.49.

[0178] In some embodiments, the dual-substrate sandwich structure is fabricated as follows:

[0179] Multilayer injection molding: First, one substrate is injection molded, then support pillars are injection molded on the surface of that substrate, and finally the other substrate is injection molded. A closed cavity is formed between the two substrates.

[0180] Alternatively, adhesive bonding: two grooved substrates are injection molded separately, one of which may have a support post; the two grooved substrates are aligned and the edges of the two substrates are bonded together using optical adhesive.

[0181] Alternatively, laser welding: two grooved substrates are injection molded separately, one of which may have a support post; the two grooved substrates are aligned and the edges of the two substrates are laser welded together.

[0182] In some alternative embodiments, the dual-substrate sandwich structure may further include an optical path modulation structure disposed within the cavity and between the substrates. The optical path modulation structure is used to further scatter light within the cavity, causing the light to exit from the side or upper and lower surfaces of the cavity. The optical path modulation structure can be a periodic optical structure or a non-periodic optical structure. Specifically, the optical path modulation structure may be a volume phase grating, etc.

[0183] The scattering structure on the light guide 112 can be a combination of the above-mentioned types.

[0184] For example, the scattering structure can be a combination of a concave dot structure 11203 and a grid structure. Specifically, a grid structure can be first fabricated on the surface of the light guide 112 using laser processing, and then concave dot structures can be fabricated between the grids using laser processing. The concave dot structure is used to scatter light, while the grid structure is used to disperse light in multiple directions. The combination of the concave dot structure and the grid structure achieves high uniformity and high luminous efficiency in the emitted light.

[0185] By combining various scattering structures, the uniformity of light can be further improved.

[0186] In some embodiments, the light guide 112 can be a double-substrate sandwich structure, and at least one surface of at least one substrate is provided with one or more of the above-mentioned protrusion structures 11206, concave structures 11203, mesh structures, and groove structures 11202. For example, the light guide 112 is a double-substrate sandwich structure, and the outer or inner surface of the substrate away from the Plassid disk 111 is provided with concave structures 11203; or the light guide 112 is a double-substrate sandwich structure, and the outer or inner surface of the substrate close to the Plassid disk 111 is provided with groove structures 11202, etc.

[0187] Other combinations will not be listed one by one.

[0188] In other embodiments, the light guide 112 is an annular shape with a notch in the direction surrounding the optical axis X. Specifically, the notch can be a through notch that radially penetrates the inner and outer edges of the light guide 112, or a non-through notch that communicates with the inner or outer edge of the light guide 112.

[0189] In other embodiments, such as Figure 12 As shown, in the direction surrounding the optical axis X, the light guide 112 includes a plurality of sub-light guides 1125. Adjacent sub-light guides 1125 can be spaced apart, for example, adjacent sub-light guides 1125 can be equally spaced apart. Alternatively, at least two adjacent sub-light guides 1125 can be at least partially connected, for example, the edges of two adjacent sub-light guides 1125 can be connected, while other two adjacent sub-light guides 1125 are spaced apart from each other.

[0190] Optionally, a plurality of sub-light guides 1125 are distributed in a rotationally symmetrical manner around the optical axis X. Each sub-light guide 1125 has a surface facing the plascidos disc 111 and a surface facing away from the plascidos disc 111. In this embodiment, the surfaces of the light guide 112 facing the plascidos disc 111 and facing away from the plascidos disc 111 are both discontinuously arranged around the optical axis X.

[0191] The surfaces of each sub-light guide 1125 facing the plascidos disk 111 and away from the plascidos disk 111 have the same characteristics as the surface of the aforementioned closed annular light guide 112. Optionally, the above-described scattering structure can also be provided on multiple sub-light guides 1125. For example, a convex structure 11204 and / or a concave structure 11201 are provided on the surfaces of the sub-light guides 1125 facing the plascidos disk 111 and away from the plascidos disk 111. The specific forms of the convex structure 11204 and the concave structure 11201 can be found in the above embodiments and will not be repeated here.

[0192] In the radial direction of the plassiding 111, sub-light guides 1125 are configured to extend toward the central aperture 110 of the plassiding 111, and multiple sub-light guides 1125 are circumferentially distributed around the central aperture 110 of the plassiding 111. Each sub-light guide 1125 corresponds to one or more first light sources 113.

[0193] In the radial direction of the plassiding 111, each sub-light guide 1125 evenly disperses the light from one or more corresponding first light sources 113. In the circumferential direction of the plassiding 111, multiple sub-light guides 1125 together evenly disperse the light from the first light sources 113. Thus, the light from the first light sources 113 can be evenly dispersed throughout the entire plassiding 111.

[0194] The quantity of the sub-light guide 1125 is not specifically limited. Figure 12 The image is for illustrative purposes only.

[0195] The width of the sub-light guide 1125 refers to its dimension along the circumference of the Placid disk 111.

[0196] In some embodiments, the sub-light guide 1125 may be of uniform width at various points along the radial direction of the plassid disk 111. In this case, the sub-light guide 1125 is generally rectangular in shape.

[0197] In some embodiments, the sub-light guide 1125 may be unequal in width at various points along the radial direction of the plassid disk 111. For example, the width of the end of the sub-light guide 1125 facing the central aperture 110 may be smaller than the width of the end facing away from the central aperture 110. The width of the sub-light guide 1125 may decrease in a stepped or continuous manner along the radial direction of the plassid disk 111 and near the central aperture 110. The sub-light guide 1125 is generally wedge-shaped.

[0198] In some embodiments, the light guide 112 may also be divided radially, that is, the light guide 112 includes a plurality of sub-parts arranged sequentially along the radial direction. Adjacent sub-parts may be spaced apart, or at least two adjacent sub-parts may be at least partially connected.

[0199] In some embodiments, the light guide 112 can be divided both radially and in the direction surrounding the optical axis X. That is, the light guide 112 may simultaneously include a plurality of circumferentially divided sub-light guides 1125, or it may include a plurality of radially divided sub-sections.

[0200] In some embodiments, the width of the sub-light guide 1125 may decrease linearly along the radial direction of the plassid disk 111 and in the direction close to the central aperture 110. The sub-light guide 1125 is generally trapezoidal, specifically an isosceles trapezoid.

[0201] In some embodiments of this application, the light guide 112 is disposed on the light-incident surface side of the placid disk 111. Specifically, the light-emitting surface of the light guide 112 abuts against the light-incident surface of the placid disk 111.

[0202] Or, such as Figure 4 and Figure 5 As shown, in some embodiments of this application, a gap 116 is provided between the light-emitting surface of the light guide 112 and the light-incident surface of the plascidos disc 111. This gap 116 is filled with a light-transmitting medium. The light-transmitting medium includes, but is not limited to, air, light-transmitting liquids, and light-transmitting solids (such as resin and glass). The purpose of this arrangement is twofold: first, the light emitted from the light guide 112 propagates at a certain angle within the gap 116, enabling diffusion and uniform light distribution, further dispersing the light evenly upon entering the plascidos disc 111; second, it provides space for the thermal expansion and deformation of the light guide 112 and the plascidos disc 111, preventing them from squeezing each other during thermal expansion, thus avoiding deformation of the light guide 112 and the plascidos disc 111 that would affect the shape of the provided patterned light, and further ensuring the accuracy of the detection of the topography of the component or eye tissue being tested.

[0203] The specific width of the aforementioned gap 116 can be set according to the materials and dimensions of the light guide 112 and the plascidos disc 111. In some optional embodiments, the width of the aforementioned gap 116 is greater than or equal to 0.5 mm. Furthermore, in order to reduce the overall thickness of the plascidos disc 111 assembly and to facilitate the installation between the plascidos disc 111 and the light guide 112, the width of the aforementioned gap 116 should not be too large. In some optional embodiments, the width of the aforementioned gap 116 is less than or equal to 5 mm. While ensuring uniform light distribution between the light guide 112 and the plascidos disc 111, the gap 116 can be set as small as possible.

[0204] For example, in some specific embodiments, the width of the gap 116 is 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0205] like Figure 4 and Figure 5As shown, in some embodiments of this application, the first light source 113 is disposed at the radial outer edge of the light guide 112. Here, "radial outer edge" refers to a region of the light guide 112 that is relatively outer along its radial direction. That is, the first light source 113 is disposed as far outward as possible from the center hole 110 of the plassiding disk 111 as possible. The light from the first light source 113 enters from the radial outer edge of the light guide 112 and propagates radially within the light guide 112 until it is dispersed throughout the entire radial direction of the plassiding disk 111.

[0206] The purpose of this arrangement is to ensure that the light gradually becomes uniform as it propagates radially. Therefore, the first light source 113 is located at the radial outer edge of the light guide 112, which helps to ensure that the pattern light emitted from the Placid disk 111 has a large range of uniform brightness, especially the central part of the pattern light. This helps to ensure the accuracy of the detection of the topography of the part to be detected or the eye tissue.

[0207] In some embodiments of this application, such as Figure 13 As shown, the first reflective layer 1122 is arranged opposite to the plascidus disk 111. This relative arrangement means that the first reflective layer 1122 and the plascidus disk 111 are connected by a light-transmitting medium. The light-transmitting medium includes, but is not limited to, air, light-transmitting liquids, and light-transmitting solids (such as resin and glass).

[0208] The light guide 112 is disposed on the optical path between the first reflective layer 1122 and the Placido disk 111.

[0209] Specifically, the first reflective layer 1122 is disposed on the side of the light guide 112 opposite to the plascidos disk 111 along the optical axis X, and the light-emitting surface of the light guide 112 is disposed on the side of the light-incident surface of the plascidos disk 111. After the light from the first light source 113 enters the light guide 112, it propagates in the light guide 112. The light rays toward the first reflective layer 1122 can be reflected by the first reflective layer 1122 and all enter the plascidos disk 111, and cannot be emitted from the side of the light guide 112 opposite to the plascidos disk 111. This reduces the light leakage of the first light source 113 and improves the light utilization rate of the optical projection module 11. Correspondingly, when the light guide 112 includes multiple sub-light guides 1125, the first reflective layer 1122 is also divided into multiple sub-parts and stacked together with the corresponding sub-light guides 1125.

[0210] The specific material and form of the first reflective layer 1122 are not limited.

[0211] In some embodiments, the first reflective layer 1122 includes one or more of the following: a sprayed layer, an electroplated layer, a physical vapor deposition layer, a chemical vapor deposition layer, a printed layer, an adhesive film layer, a reflector, and a doped layer integrated with the light guide. When the first reflective layer 1122 includes multiple of the following: a sprayed layer, an electroplated layer, a physical vapor deposition layer, a printed layer, an adhesive film layer, a reflector, and a doped layer integrated with the light guide 112, the first reflective layer 1122 can be a side-by-side combination of these multiple layers, or a stacked combination of these multiple layers.

[0212] The spray coating refers to the coating formed on the surface of the light guide 112 by spraying. For example, the spray coating can be a black or silver paint layer, etc.

[0213] An electroplated layer refers to a film layer formed on the surface of the light guide 112 by electrochemical plating. For example, the electroplated layer can be one or more of the following: a gold layer, a silver layer, and an aluminum layer.

[0214] A physical vapor deposition layer refers to a film layer formed on the surface of the light guide 112 by physical vapor deposition. For example, the physical vapor deposition layer can be one or more of the following: a gold layer, a silver layer, and an aluminum layer.

[0215] The chemical vapor deposition layer mentioned is not limited. For example, chemical vapor deposition layers can include metal oxide layers, metal carbide layers, etc.

[0216] The printed layer refers to a material layer formed on the surface of the light guide 112 by printing. For example, the printed layer can be a black ink layer, etc.

[0217] An adhesive film refers to a film layer that is applied to the surface of the light guide 112 by means of adhesive. For example, the adhesive film layer can be an optical interference reflective film, a protective reflective film, etc.

[0218] The reflector spaced apart from the plascidus disk 111 refers to a reflective structure manufactured independently of the light guide 112 and installed on the side of the light guide 112 away from the plascidus disk 111 through installation and connection. For example, the reflector may include at least one of a metal plate layer, a discrete film layer, or a microstructure layer with reflective properties. The microstructure has concave and convex microstructures for reflection. Specifically, the concave and convex microstructures may be sawtooth-shaped, pyramid-shaped, etc., for directional reflection of light to reflect the light back into the light guide 112 as much as possible.

[0219] In this embodiment, there may be a gap between the reflector and the light guide 112, or there may be no gap.

[0220] The doped layer integrally formed with the light guide 112 through two-color injection molding refers to the doped layer that is integrally formed with the light guide 112 through two-color injection molding. The doped layer contains reflective particles. These reflective particles may include one or more of zirconium dioxide particles, titanium dioxide particles, and barium sulfate particles.

[0221] In some embodiments, the first reflective layer 1122 includes multiple layers selected from the following: a sprayed layer, an electroplated layer, a physical vapor deposition layer, a printed layer, an adhesive film layer, a reflector, and a doped layer integral with the light guide 112. For example, in the direction away from the light guide 112, the first reflective layer 1122 may sequentially include a microstructure layer and an electroplated layer; or, the first reflective layer 1122 may sequentially include an optical interference reflective film and a sprayed layer; or, the first reflective layer 1122 may sequentially include a doped layer and an electroplated layer integrally injection molded with the light guide 112 in two colors, etc.

[0222] Other combinations will not be listed in detail.

[0223] like Figure 13 As shown, in the radial direction of the light guide 112, light propagates through multiple reflections within the light guide 112. At a certain point in the light guide 112, some light rays satisfy the emission conditions on the light-emitting surface of the light guide 112, exiting the light guide 112 and entering the plassid disk 111. Other light rays do not satisfy the emission conditions, continue to be reflected towards the first reflective layer 1122, and are reflected again by the first reflective layer 1122 towards another light-emitting surface of the light guide 112. This continues until all light rays exit from the light-emitting surface of the light guide 112.

[0224] like Figure 4 and Figure 5 As shown, in some embodiments of this application, the connector 114 is disposed on the radial outer edge of the plassiding 111 and the light guide 112, and the radial outer edge of the plassiding 111 and the radial outer edge of the light guide 112 are fixedly connected. Optionally, at least a portion of the first light source 113 is disposed at the radial outer edge of the light guide 112, then at least a portion of the first light source 113 may be located within the connector 114.

[0225] In some alternative embodiments, please refer to Figure 5 As shown, the connector 114 is provided with a slot 1140, in which the radial outer edge of the plassid disk 111, the radial outer edge of the light guide 112, and the first light source 113 are all located. In the thickness direction of the plassid disk 111, the connector 114 clamps and fixes the plassid disk 111, the light guide 112, and the first light source 113.

[0226] Specifically, such as Figure 5As shown, in the thickness direction of the placid disk 111, the connector 114 includes a first connecting portion 1141 and a second connecting portion 1142 that are connected to each other. The first connecting portion 1141 and the second connecting portion 1142 clamp and fix the placid disk 111, the light guide 112 and the first light source 113 from the front and rear sides of the optical projection module 11, respectively.

[0227] The connection method between the first connecting part 1141 and the second connecting part 1142 is not limited. For example, it can be through a fastening element 1143 (such as a bolt and nut). Any other method that can form a fixed connection between the first connecting part 1141 and the second connecting part 1142 is also possible, and will not be described further.

[0228] Please see Figure 5 As shown, the connector 114 is arranged around the optical axis X. In some optional embodiments, the connector 114 may specifically be a closed ring or a non-closed ring structure in the direction surrounding the optical axis X. In some specific embodiments, the connector 114 is a closed ring around the optical axis X.

[0229] The purpose of this arrangement is that the connector 114 can surround the entire outer edge of the plassiding 111 and the light guide 112, preventing light leakage from the outer edges of the plassiding 111 and the light guide 112. Therefore, the closed-loop connector 114 can improve the light utilization rate of the first light source 113.

[0230] In some embodiments, the light guide 112 and the plassiding disk 111 are conformally oriented. The light-incident surface and the light-exit surface of the light guide 112 are conformally oriented to the light-incident surface and the light-exit surface of the plassiding disk 111.

[0231] In some embodiments, the light-incident and light-exit surfaces of the light guide 112 and the plascidos disk 111 are both convex surfaces. This arrangement aims to deflect the light rays through the light guide 112 and plascidos disk 111. The light rays exit from the light-exit surface of the light guide 112, and after passing through the concave surface, propagate in a divergent manner, thus expanding and dispersing the light rays radially along the plascidos disk 111. In this way, the light rays from each first light source 113 can be uniformly distributed radially along the plascidos disk 111.

[0232] The plascidoo disk 111 and the light guide 112 are centrally rotating structures. Therefore, the circumferential cross-section of both the plascidoo disk 111 and the light guide 112 is circular. Similarly, this allows the light from each first light source 113 to expand and disperse circumferentially along the plascidoo disk 111, and multiple first light sources 113 distributed circumferentially along the plascidoo disk 111 collectively provide a uniform, ring-shaped surface light source.

[0233] In some embodiments, the light-incident surface of the light guide 112 is a conical surface, a portion of a sphere, a portion of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

[0234] In some embodiments, the light-emitting surface of the light guide 112 is a conical surface, a portion of a sphere, a portion of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

[0235] In some embodiments, the incident surface of the Plassid disk 111 is a conical surface, a portion of a sphere, a portion of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher-order surface of revolution.

[0236] In some embodiments, the light-emitting surface of the Plassid disk 111 is a conical surface, a portion of a sphere, a portion of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher-order surface of revolution.

[0237] In some embodiments of this application, the plascidos disk 111 and the light guide 112 are integrally formed, and the disk body 1113 of the plascidos disk 111 is part of the light guide 112, or in other words, the light guide 112 also serves as the disk body 1113 of the plascidos disk 111. A non-transparent annular structure 1114 may be disposed on the light guide 112. For example, the non-transparent annular structure 1114 is disposed on the light emitting surface of the light guide 112.

[0238] like Figure 27 , Figure 28 and Figure 29 As shown, arc BAC is the cross-section of the Placido disk, A is a point on the ring, B is the position of the central circular hole, and C is the endpoint of Placido disk 111. The virtual image point after corneal reflection is located at A'. According to the principle of spherical lens imaging, we know that:

[0239]

[0240] Where P = AD is the object distance; q = DA' is the image distance; f' is the focal length of the spherical mirror; and r is the radius of the spherical mirror.

[0241] Let the coordinates of A be (x, y), then the object distance... Substituting into equation (1), we get:

[0242]

[0243] Solving for:

[0244]

[0245] Let the coordinates of A' be (x0, y0), then:

[0246]

[0247] Without considering the distortion of the corneal surface reflection system, equation (4) can be compared with equation (5) to obtain:

[0248]

[0249] Since (x, y) lies on the equation of the ellipse, it satisfies:

[0250]

[0251] Solving equations (6) and (7) simultaneously, we get:

[0252]

[0253] According to the principle of spherical mirror imaging, each object point on the ellipse corresponds to an image point. The coordinates of the image point can be determined by equation (2). At the same time, as long as the distribution of the rings on the image surface is determined, the distribution of the rings on the Plassid disk can be obtained by equations (8) and (9).

[0254] Taking the Plassid disk 111 as an example of a 24-ring ellipsoidal structure, B'C' is the image point of points B and C. Let the ordinates be y'b and y'c, respectively. Then y'c-y'b is the perpendicular distance of the virtual image projected onto the plane. Let the width of each ring be △d, then:

[0255]

[0256] In some embodiments of this application, the optical projection module 11 further includes a reflective housing (not shown), which is disposed on the side of the first light source 113 and the light guide 112 facing away from the plassiding disk 111. The reflective housing can serve as a second reflective layer, with the side of the reflective housing facing the plassiding disk 111 serving as a reflective surface to reflect light towards the plassiding disk 111 once, thereby ensuring that as much light as possible exits through the plassiding disk 111 without leakage from the side facing away from the plassiding disk 111. Furthermore, the reflective housing can also protect and enclose the first light source 113 and the light guide 112, and make the optical projection module 11 a single, integrated structure.

[0257] The number of light-transmitting areas 1111 and non-light-transmitting areas 1112 in the radial direction of the optical projection module 11 is unlimited and can be set according to the detection requirements. The light-transmitting areas 1111 are sequentially marked in a radially outward direction from the central hole 110, designated as the 1st ring, 2nd ring, 3rd ring, etc. Please refer to... Figures 14 to 24 As shown in the figure and Table 1 below, the brightness uniformity of each ring of the pattern light emitted from the optical projection module 11 is good, and the overall light emission uniformity of the optical projection module 11 is good.

[0258] Table 1. Light output intensity of different rings of the optical projection module (unit: LUX)

[0259]

[0260] Please see Figure 25 As shown in the embodiments of this application, a refractive power measurement device 100 is also provided. The device 100 includes an optical projection module 11 as described in the above embodiments, and an imaging module 12. A plascidospheric disc 111 assembly projects the aforementioned patterned light (as a first patterned light) onto the component or ocular tissue to be measured. The first patterned light is reflected at the surface of the component or ocular tissue to form a reflected beam (as a second patterned light). The imaging module 12 receives the second patterned light. The degree of deformation of the second patterned light relative to the first patterned light reflects the surface topography of the component or ocular tissue to be measured.

[0261] Since the light guide 112 in the optical projection module 11 disperses the light from the first light source 113 in the radial and axial directions, the brightness uniformity of the first pattern light is improved, and the brightness uniformity of the second pattern light received by the refractive power detection device 100 is improved, thereby improving the detection accuracy of the surface topography of the component to be detected or the eye tissue.

[0262] The refractive power measurement device 100 provided in this application embodiment can be used for, but is not limited to, the following:

[0263] Curvature detection of optical components such as spherical and aspherical optical diffraction elements and optical communication devices;

[0264] Inspection of freeform surface eyeglass lenses and contact lenses;

[0265] Clinical ophthalmic testing: Assisting in the detection of corneal curvature (such as detecting abnormal corneal curvature in patients with keratoconus) and lens refractive power (used to evaluate the selection parameters of intraocular lenses for cataract patients before surgery);

[0266] Quality inspection of intraocular lenses (IOLs).

[0267] Finally, this application also provides an ophthalmic device 200, such as... Figure 26 As shown, it includes the aforementioned refractive power detection device 100 and at least one optical scanning system 13. The refractive power detection device 100 is used to acquire surface morphology or refractive power information of ocular tissues, and the optical scanning system 13 is used to acquire structural image data of ocular tissues. This ophthalmic device 200 can simultaneously detect the surface and deep tissues of the anterior segment of the eye, and can acquire three-dimensional information of ocular tissues.

[0268] In some embodiments, the optical scanning system 13 includes at least one of an OCT scanning system, a confocal scanning system, and an ultrasonic scanning system.

[0269] The optical scanning system 13 includes an OCT scanning system. In some alternative embodiments, such as... Figure 26 As shown, the optical scanning system 13 partially overlaps with the optical path of the diopter detection device 100. Specifically, as... Figure 26 As shown, the ophthalmic device 200 also includes a beam splitter 14, which is disposed on the side of the optical projection module 11 facing the imaging module 12. The refractive power detection device 100 is used to provide a first incident beam (the aforementioned first patterned light) and receive a first reflected beam formed by the reflection of the first incident beam by the anterior segment of the eye. The optical scanning system 13 provides a second incident beam and receives a second reflected beam formed by the reflection of the second incident beam by the anterior segment of the eye. The beam splitter 14 is configured to transmit light of the wavelength corresponding to the first incident beam, i.e., to transmit the first reflected beam, and to reflect the second incident beam and the second reflected beam. Therefore, the beam splitter 14 can guide the second incident beam to the anterior segment of the eye; for the first reflected beam and the second reflected beam from the anterior segment of the eye, the beam splitter 14 can separate the first reflected beam and the second reflected beam.

[0270] In some alternative embodiments, the ophthalmic device 200 further includes a data analysis and processing module (not shown), which is communicatively connected to the refractive power detection device 100 and the optical scanning system 13, respectively, for acquiring surface morphology of ocular tissues and tomographic image data of anterior segment tissues, and reconstructing the surface morphology of ocular tissues and tomographic image data of anterior segment tissues into three-dimensional information of anterior segment.

[0271] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical projection module, characterized in that, The device includes a light guide, a plascidus disk, a first light source, a first reflective layer, and a connector. The first light source is disposed in one or more of three locations: one side of the light guide, inside the light guide, or on the plascidus disk. The light guide is disposed on one side of the light-incident surface of the plascidus disk. The light guide is used to uniformly guide the light from the first light source to the plascidus disk. The first reflective layer is used to cooperate with the light guide to efficiently reflect the light from the first light source to the plascidus disk. The connector is used to connect the light guide, the plascidus disk, and the first light source.

2. The optical projection module as described in claim 1, characterized in that, The light guide is disposed on the optical path between the first reflective layer and the Placido disk, and the optical path is filled with a light-transmitting or light-diffusing medium; the first light source is disposed at one or more of three locations: on one side or inside the light guide, or on the Placido disk, including the light-emitting surface of the light guide, the light-incident surface of the light guide, the inner side of the light guide, the outer side of the light guide, the interior of the light guide, the outer side of the Placido disk, and the inner side of the Placido disk.

3. The optical projection module as described in claim 1, characterized in that, In the direction surrounding the optical axis, the light guide is in the form of a closed ring, or the light guide is in the form of a ring with a notch, or the light guide includes a plurality of spaced sub-light guides, with adjacent sub-light guides spaced apart or at least two adjacent sub-light guides being at least partially connected; And / or, in the radial direction of the light guide, the light guide includes a plurality of sub-sections, with adjacent sub-sections spaced apart or at least two adjacent sub-sections being at least partially connected.

4. The optical projection module as described in claim 3, characterized in that, The light guide has a scattering structure on its surface and / or inside, and the surface of the light guide includes at least one of the surface facing the Placid disk, the surface facing the first reflective layer, and the side surface of the light guide.

5. The optical projection module as described in claim 4, characterized in that, The scattering structure of the light guide element satisfies at least one of the following: The scattering structure includes a bump structure, which is at least one of the following: a bump integrally injection molded with the light guide, a laser-processed bump, or a bump integrally molded with the light guide. The scattering structure includes a concave structure, which is at least one of the following: a concave structure integrally injection molded with the light guide, a laser-processed concave structure, and a concave structure integrally molded with the light guide. The scattering structure includes a mesh structure, which includes multiple intersecting meshes. The meshes include at least one of the following: a mesh integrally rolled with the light guide, a mesh integrally molded with the light guide, a mesh integrally injection molded with the light guide, and a laser-processed mesh. The scattering structure includes a groove structure, which includes multiple grooves. The grooves are arranged in a regular, irregular, or combination thereof. The extension direction of the grooves includes at least one of straight lines, arcs, spirals, and zigzags. The grooves are formed by at least one of injection molding, compression molding, laser processing, roll forming, and mechanical cutting. The light guide is a double-substrate sandwich structure, comprising two substrates arranged opposite each other, with an optical path modulation structure between the substrates, the optical path modulation structure including periodic or non-periodic optical structures.

6. The optical projection module as described in claim 1, characterized in that, The Placid disk includes a light-transmitting disk body and multiple opaque annular structures. The multiple opaque annular structures are distributed at intervals in a concentric or approximately concentric manner. The opaque annular structures are disposed on at least one side and / or inside the disk body. The at least one side includes a side away from the light guide and a side facing the light guide. The portion of the disk body corresponding to the space between the opaque annular structures serves as a light-transmitting area.

7. The optical projection module as described in claim 6, characterized in that, The disk body has at least one side provided with a plurality of concentric or nearly concentric and spaced recessed structures, the at least one side including a side away from the light guide and a side facing the light guide, and in the thickness direction of the disk body, at least a portion of the non-transparent annular structure is disposed in the recessed structure. Alternatively, the disk body may not have a recessed structure, and the disk body may include an integrally formed light-transmitting area and a non-light-transmitting annular structure. Alternatively, the disk body may not have a recessed structure, and the non-transparent annular structure may satisfy one or more of the following combinations: Including spray coating; Including electroplating; Including physical vapor deposition layers; Including chemical vapor deposition layers; Including the printed layer; Including the adhesive film layer; It includes a discrete structure spaced apart from the disk body, the discrete structure including at least one of a metal plate layer, a discrete film layer, and a microstructure layer, the microstructure layer having concave and convex microstructures for absorbing light; It includes a doped layer formed by double injection molding with the disk body, wherein the doped layer is doped with light-absorbing particles.

8. The optical projection module as described in claim 1, characterized in that, The optical projection module satisfies at least one of the following: The light-emitting surface of the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution. The incident surface of the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution. The surface of the light guide facing the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution. The surface of the light guide away from the Placido disk is a regular curved surface, an irregular curved surface, or a combination of both. The regular curved surface includes a conical surface, a part of a sphere, a part of an ellipsoid, a paraboloid of revolution, a hyperboloid of revolution, or a higher order surface of revolution.

9. The optical projection module as described in claim 1, characterized in that, The first reflective layer satisfies one or more of the following combinations: Including spray coating; Including electroplating; Including physical vapor deposition layers; Including chemical vapor deposition layers; Including the printed layer; Including the adhesive film layer; The reflector is provided at intervals from the Plassey disc. The reflector includes at least one of a plate layer with reflective properties, a discrete film layer, and a microstructure layer. The microstructure layer is provided with concave and convex microstructures for reflection. It includes a doped layer formed by double injection molding with the light guide, wherein the doped layer is doped with reflective particles.

10. The optical projection module as described in claim 1, characterized in that, The first light source includes at least one of the following wavelength bands: red light band, green light band, blue light band, infrared light band, and ultraviolet light band; the first light source includes at least one of the following: light-emitting diode, organic light-emitting diode, and laser light source.

11. The optical projection module as described in claim 10, characterized in that, The shape of the light-emitting area of ​​the first light source includes at least one of the following: dot-shaped, line-shaped, surface-shaped, ring-shaped, array-shaped, segmented combination-shaped, or irregular shape.

12. The optical projection module as described in claim 1, characterized in that, The connector is a closed ring and has a slot. The radial outer edge of the Placid disk, the radial outer edge of the light guide, and at least a portion of the light source are all located within the slot.

13. The optical projection module as described in claim 6, characterized in that, The Placido disk and the light guide are integrally formed, the disk body of the Placido disk is part of the light guide, and the non-transparent annular structure is disposed on the light guide.

14. A refractive power measurement device, characterized in that, Includes the optical projection module as described in any one of claims 1 to 13.

15. An ophthalmic device, characterized in that, include: The refractive power detection device as described in claim 14 is used to acquire surface morphology or refractive power information of ocular tissues; as well as An optical scanning system for acquiring structural image data of ocular tissues, wherein the optical scanning system includes at least one of an OCT scanning system and an ultrasound scanning system.

Images