Optical structure and operating shadowless lamp

Abstract

The invention provides an optical structure and an operating shadowless lamp. The optical structure comprises a first lens unit and a second lens unit, the first lens unit comprises a collimating lens module and a first dodging lens, the collimating lens module is configured to collimate the received illumination light to form uniformly distributed parallel light, the first dodging lens comprises a plurality of first convex lenses, and the incident surfaces of the first convex lenses are convex surfaces; the second lens unit comprises a second dodging lens, the second dodging lens comprises a plurality of second convex lenses, the plurality of second convex lenses and the plurality of first convex lenses are arranged in a one-to-one correspondence manner, and the light emitting surfaces of the second convex lenses are convex surfaces; the distance between the first dodging lens and the second dodging lens is adjustable, and light spots formed after parallel light is dodged through the first dodging lens and the second dodging lens are gradually enlarged along with reduction of the distance between the first dodging lens and the second dodging lens. According to the invention, stepless adjustment of the light spot size can be realized, and the light spot size can be accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of optical lighting technology, and in particular to an optical structure and a surgical shadowless lamp. Background Technology

[0002] Surgical shadowless lamps are essential equipment for illuminating surgical sites. In application, the size and light distribution within the spot need to be adjusted according to the surgical requirements to adapt to different types of surgeries or incision sizes. Simultaneously, surgical shadowless lamps must provide a good shadowlessness rate to ensure sufficient illumination of the surgical field even when obstructions occur during surgery.

[0003] Currently, mainstream surgical shadowless lamps use LEDs in conjunction with optical components to provide illumination. The optical components provide fixed optical characteristics, which are adjusted by arranging more LEDs and optical components. Different spot sizes and illuminance distributions are achieved by electronically controlling the brightness of different groups of LEDs. Therefore, it is impossible to fully utilize all LEDs and optical components, which negatively impacts the shadowless effect of the surgical shadowless lamp.

[0004] Meanwhile, according to the surgical shadowless lamp standard YY9706.241 regarding the uniformity of the light spot, during the change of the light spot, the light spot diameter d50 and d10 at 1m distance from the light source, with the illuminance at 1 / 2 and 1 / 10 of the central illuminance, should meet the requirement that the d50 / d10 value is not less than 0.5. Currently, the highest d50 / d10 value achievable with conventional lens technology is around 0.6. Please refer to [reference needed]. Figure 1 This is a schematic diagram of the illuminance distribution within a light spot that can be achieved using conventional lens technology.

[0005] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an optical structure and a surgical shadowless lamp that can not only form a light spot with uniform illumination within the surgical field area while the illumination is sharply reduced outside the surgical field area, but also achieve stepless adjustment of the light spot size and precise control of the light spot size.

[0007] To achieve the above objectives, the present invention provides an optical structure, including a first lens unit and a second lens unit disposed along the optical path;

[0008] The first lens unit includes a collimating lens module and a first uniform light lens. The collimating lens module is configured to collimate the received illumination light to form uniformly distributed parallel light. The first uniform light lens includes a plurality of first convex lenses arranged in a compound eye array. The light-incident surface of the first convex lens is disposed facing the light-outceasing surface of the collimating lens module, and the light-incident surface of the first convex lens is a convex surface.

[0009] The second lens unit includes a second homogenizing lens, which includes a plurality of second convex lenses arranged in a compound eye array. The plurality of second convex lenses are arranged in a one-to-one correspondence with the plurality of first convex lenses. The light-incident surface of the second convex lens is arranged facing the light-out surface of the corresponding first convex lens, and the light-out surface of the second convex lens is a convex surface.

[0010] The distance between the first homogenizing lens and the second homogenizing lens is adjustable. The light spot formed by the parallel light after being homogenized by the first homogenizing lens and the second homogenizing lens gradually increases as the distance between the first homogenizing lens and the second homogenizing lens decreases.

[0011] Optionally, the collimating lens module includes a first condensing lens and a second condensing lens, wherein the light-emitting surfaces of the first condensing lens and the second condensing lens are both convex surfaces, and the second condensing lens is located between the first condensing lens and the first uniform light lens.

[0012] Optionally, the radius of curvature of the convex surface of the second condenser lens is greater than the radius of curvature of the convex surface of the first condenser lens.

[0013] Optionally, at least 10 of the first convex lenses are arranged along the diameter of the first homogenizing lens.

[0014] Optionally, at least 10 of the second convex lenses are arranged along the diameter of the second homogenizing lens.

[0015] Optionally, the focal length of the first convex lens is equal to the focal length of the second convex lens, and the maximum adjustable distance between the first homogenizing lens and the second homogenizing lens is equal to twice the focal length.

[0016] Optionally, when the distance between the first homogenizing lens and the second homogenizing lens is adjusted to be as close as possible, the light-emitting surface of the first homogenizing lens is in contact with the light-incident surface of the second homogenizing lens.

[0017] Optionally, both the light-emitting surface of the first homogenizing lens and the light-incident surface of the second homogenizing lens are planar.

[0018] Optionally, the second lens unit further includes a third homogenizing lens, the incident surface of which is in contact with the exit surface of the second homogenizing lens.

[0019] Optionally, the incident surface of the third uniform light lens is a plane, and the exit surface of the third uniform light lens is a convex surface.

[0020] Optionally, the second lens unit is connected to a moving device configured to drive the second lens unit closer to or further away from the first lens unit to adjust the distance between the first homogenizing lens and the second homogenizing lens.

[0021] To achieve the above objectives, the present invention also provides a surgical shadowless lamp, which includes the optical structure described above.

[0022] Compared with the prior art, the optical structure and surgical shadowless lamp provided by the present invention have the following beneficial effects:

[0023] The optical structure provided by this invention includes a first lens unit and a second lens unit arranged along the optical path. The first lens unit includes a collimating lens module and a first homogenizing lens. The collimating lens module is configured to collimate the received illumination light to form uniformly distributed parallel light. The first homogenizing lens includes a plurality of first convex lenses arranged in a compound eye array. The light-incident surface of the first convex lens is arranged facing the light-exit surface of the collimating lens module, and the light-incident surface of the first convex lens is convex. The second lens unit includes a second homogenizing lens. The second homogenizing lens includes a plurality of second convex lenses arranged in a compound eye array. The plurality of second convex lenses are arranged in a one-to-one correspondence with the plurality of first convex lenses. The light-incident surface of the second convex lens is arranged facing the light-exit surface of the corresponding first convex lens, and the light-exit surface of the second convex lens is convex. Therefore, by setting a collimating lens module, not only can the light rays be collimated, but the collimated light rays can also be evenly distributed. The first and second homogenizing lenses can homogenize the light. The multiple first convex lenses on the first homogenizing lens and the multiple second convex lenses on the second homogenizing lens can be considered as multiple independent small light sources. The parallel light (illumination light) collimated by the collimating lens module, after passing through the first and second homogenizing lenses, will eliminate the light spot of wafer imaging and become a uniform circular light spot formed by the superposition of multiple independent small light sources. This can form a light spot that provides uniform illumination within the surgical field area while sharply reducing the illumination outside the surgical field area. In addition, since the distance between the first and second homogenizing lenses is adjustable, the light spot formed after the parallel light is homogenized by the first and second homogenizing lenses gradually increases in size as the distance between the first and second homogenizing lenses decreases. This allows for stepless adjustment of the light spot size and precise control of the light spot size. In summary, the optical structure provided by this invention uses a lens group composed of multiple lenses as an integrated optical element. By moving the lenses within the lens group, different spot sizes and different spot distributions are generated. Thus, the light source (e.g., LED) and optical element can be fully utilized, and a good shadowless effect can still be provided without changing the overall optical path structure of the surgical shadowless lamp.

[0024] Since the surgical shadowless lamp provided by this invention and the optical structure provided by this invention belong to the same inventive concept, the surgical shadowless lamp provided by this invention has all the beneficial effects of the optical structure provided by this invention. For details, please refer to the relevant description above. Therefore, the beneficial effects of the surgical shadowless lamp provided by this invention will not be elaborated here. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the illuminance distribution within a light spot that can be achieved using conventional lens technology.

[0026] Figure 2 A schematic diagram of the overall structure of the optical structure provided in one embodiment of the present invention;

[0027] Figure 3 An optical path simulation diagram of an optical structure provided in one embodiment of the present invention;

[0028] Figure 4 A schematic diagram of light spot formation when the distance between the first and second homogenizing lenses in the optical structure provided in an embodiment of the present invention is adjusted to the farthest point.

[0029] Figure 5 A schematic diagram of the illuminance distribution within the light spot when the distance between the first and second homogenizing lenses in the optical structure provided in an embodiment of the present invention is adjusted to the maximum.

[0030] Figure 6 A schematic diagram of light spot formation when the distance between the first and second homogenizing lenses in the optical structure provided in an embodiment of the present invention is adjusted to be as close as possible;

[0031] Figure 7 A schematic diagram of the illuminance distribution within a light spot when the distance between the first and second homogenizing lenses in an optical structure provided according to an embodiment of the present invention is adjusted to be as close as possible.

[0032] Figure 8 This is a schematic diagram illustrating the effect of the number of lenses in the compound eye lens of an optical structure provided in an embodiment of the present invention on the illuminance at the edge of the light spot.

[0033] The reference numerals in the attached figures are as follows:

[0034] First lens unit - 100; Collimating lens module - 110; First condenser lens - 111; Second condenser lens - 112; First homogenizing lens - 120; First convex lens - 121;

[0035] Second lens unit -200; Second homogenizing lens -210; Second convex lens -211; Third homogenizing lens -220;

[0036] Light source -300; light spot -400. Detailed Implementation

[0037] The optical structure and surgical shadowless lamp proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of this invention. Please refer to the drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this invention. Any modifications to the structure, changes in proportions, or adjustments to the size, if they are the same as or similar to the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and usage environment. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different drawings to denote the same parts or parts having the same function, and repeated descriptions are omitted. In this specification, similar reference numerals and letters are used to denote similar items, so once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The singular forms “a,” “one,” and “the” include plural objects. The term “or” is generally used to mean “and / or.” The term “several” is generally used to mean “at least one.” The term “at least two” is generally used to mean “two or more.” The term “multiple” is generally used to mean “at least two.”

[0039] Furthermore, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the 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 invention. In the description of this invention, unless otherwise expressly specified and limited, the terms "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0040] The core idea of ​​this invention is to provide an optical structure and surgical shadowless lamp that can not only form a light spot with uniform illumination within the surgical field area while the illumination is sharply reduced outside the surgical field area, but also achieve stepless adjustment of the light spot size and precise control of the light spot size.

[0041] To achieve the above-mentioned ideas, this invention provides an optical structure, please refer to... Figure 2 and Figure 3 ,in, Figure 2 A schematic diagram of the overall structure of the optical structure provided in one embodiment of the present invention; Figure 3 This is a simulated optical path diagram of an optical structure provided in one embodiment of the present invention. Figure 2 and Figure 3 As shown, the optical structure provided by the present invention includes a first lens unit 100 and a second lens unit 200 arranged along the optical path; the first lens unit 100 includes a collimating lens module 110 and a first homogenizing lens 120, the collimating lens module 110 being configured to collimate the received illumination light to form uniformly distributed parallel light, and the first homogenizing lens 120 including a plurality of first convex lenses 121 arranged in a compound eye array (see...). Figure 4 The light-incident surface of the first convex lens 121 is disposed facing the light-outceasing surface of the collimating lens module 110, and the light-incident surface of the first convex lens 121 is convex; the second lens unit 200 includes a second homogenizing lens 210, the second homogenizing lens 210 including a plurality of second convex lenses 211 arranged in a compound eye array (see...). Figure 4The plurality of second convex lenses 211 are arranged in a one-to-one correspondence with the plurality of first convex lenses 121. The light-incident surface of the second convex lens 211 faces the light-exit surface of the corresponding first convex lens 121, and the light-exit surface of the second convex lens 211 is convex. The distance between the first uniform light lens 120 and the second uniform light lens 210 is adjustable. The illumination light forms a light spot 400 after passing through the first lens unit 100 and the second lens unit 200 (see...). Figure 4 The distance between the first homogenizing lens 120 and the second homogenizing lens 210 gradually increases as the distance decreases.

[0042] Therefore, by setting the collimating lens module 110, not only can the light rays be collimated, but the collimated light rays can also be evenly distributed. The first homogenizing lens 120 and the second homogenizing lens 210 can play the role of homogenizing light. The multiple first convex lenses 121 on the first homogenizing lens 120 and the multiple second convex lenses 211 on the second homogenizing lens 210 can be regarded as multiple independent small light sources 300. The parallel light (illumination light) after being collimated by the collimating lens module 110 will eliminate the light spot 400 of wafer imaging after passing through the first homogenizing lens 120 and the second homogenizing lens 210, and become a uniform circular light spot 400 formed by the superposition of multiple independent small light sources 300. Thus, a light spot 400 that provides uniform illumination in the surgical field area while the illumination is sharply reduced outside the surgical field area can be formed. Furthermore, since the distance between the first homogenizing lens 120 and the second homogenizing lens 210 is adjustable, the light spot 400 formed after the parallel light is homogenized by the first homogenizing lens 120 and the second homogenizing lens 210 gradually increases in size as the distance between the first homogenizing lens 120 and the second homogenizing lens 210 (the maximum distance is the sum of the focal lengths of the first convex lens 121 and the second convex lens 211) decreases. This allows for stepless adjustment of the light spot 400 size and precise control of its size. In summary, the optical structure provided by this invention uses a lens group combining multiple lenses as an integrated optical element. By moving the lenses within the lens group, different light spot sizes and distributions are achieved. This allows for full utilization of the light source 300 (e.g., LED beads) and optical elements, providing a good shadowless effect without altering the overall optical path structure of the surgical shadowless lamp.

[0043] It should be noted that, as those skilled in the art will understand, the optical structure provided by this invention can be configured in a one-to-one correspondence with the light source 300 (e.g., LED beads). Furthermore, it should be noted that... Figure 3 The optical path simulation diagram shown is obtained using LightTools software. Figure 3As can be seen, the optical structure provided by this invention can achieve light collimation with a uniform light spot and no wafer imaging defects. It should also be noted that, as those skilled in the art will understand, the light-emitting position of an LED bead is on a wafer, and the wafer contains numerous small grids (lattices). The shape of the wafer does not necessarily have to be circular. In lighting optics, wafer imaging refers to the appearance of an image in the illuminated area that is a series of small grids with the same shape as the wafer (similar to the effect of a projector). Since illumination requires a uniform light spot, this type of wafer imaging is considered a defect.

[0044] Please continue to refer to this. Figure 2 and Figure 3 ,like Figure 2 and Figure 3 As shown, in some exemplary embodiments, the diameter of the first homogenizing lens 120 is equal to the diameter of the second homogenizing lens 210. Since the diameter of the first homogenizing lens 120 is equal to the diameter of the second homogenizing lens 210, two compound eye convex lenses with identical structures but opposite mounting directions can be used as the first homogenizing lens 120 and the second homogenizing lens 210, thereby reducing the types of lenses and lowering production costs.

[0045] In some exemplary embodiments, the focal length of the first convex lens 121 is equal to the focal length of the second convex lens 211, and the maximum adjustable distance between the first homogenizing lens 120 and the second homogenizing lens 210 is equal to twice the focal length. Therefore, by setting the focal length of the first convex lens 121 to be equal to the focal length of the second convex lens 211, it is easier to achieve stepless adjustment of the size of the light spot 400 by adjusting the distance between the first homogenizing lens 120 and the second homogenizing lens 210, thus enabling precise control of the size of the light spot 400. By setting the maximum adjustable distance between the first homogenizing lens 120 and the second homogenizing lens 210 to twice the focal length, parallel light passing through the first convex lens 121 on the first homogenizing lens 120 will be focused at the focal point of the corresponding second convex lens 211 on the second homogenizing lens 210. Since the first homogenizing lens 120 and the second homogenizing lens 210 have the same structure, and the first convex lens 121 and the second convex lens 211 have the same focal length, the focused light rays can be converted into parallel light after passing through the second homogenizing lens 210. At this time, the formed light spot 400 is minimized. Figure 4 As shown, this is a schematic diagram of the formation of a light spot 400 when the distance between the first homogenizing lens 120 and the second homogenizing lens 210 in the optical structure provided in an embodiment of the present invention is adjusted to its maximum, and d50 / d10 is at its maximum, close to 1. At this time, the illuminance distribution within the light spot 400 is as follows: Figure 5The diagram shown illustrates the illuminance distribution within a light spot 400 when the distance between the first homogenizing lens 120 and the second homogenizing lens 210 in an optical structure provided by an embodiment of the present invention is adjusted to its maximum. Figure 5 It can be seen that when the first homogenizing lens 120 and the second homogenizing lens 210 are adjusted to be the furthest apart (twice the focal length), the illuminance in the area of ​​the light spot 400 is almost constant. Thus, in practical applications, it can provide stable illumination for the surgical field area with almost no attenuation around it, effectively avoiding deviations in the doctor's observation caused by differences in illuminance.

[0046] In some exemplary embodiments, when the distance between the first homogenizing lens 120 and the second homogenizing lens 210 is adjusted to its closest point, the light-exiting surface of the first homogenizing lens 120 and the light-incident surface of the second homogenizing lens 210 are in contact. Since the light-exiting surface of the first homogenizing lens 120 and the light-incident surface of the second homogenizing lens 210 are in contact when the distance between them is adjusted to its closest point, the first homogenizing lens 120 and the second homogenizing lens 210 can collectively form a convex lens with a large curvature, resulting in the largest possible light spot 400. Figure 6 The diagram illustrates the formation of a light spot 400 when the distance between the first homogenizing lens 120 and the second homogenizing lens 210 in an optical structure provided by an embodiment of the present invention is adjusted to be as close as possible. At this time, the illuminance distribution within the light spot 400 is as follows: Figure 7 The diagram shown illustrates the illuminance distribution within a light spot 400 when the distance between the first homogenizing lens 120 and the second homogenizing lens 210 in an optical structure provided by an embodiment of the present invention is adjusted to be as close as possible. Figure 7 As shown, the distance between the first homogenizing lens 120 and the second homogenizing lens 210 is adjusted to the closest possible setting, providing a large, uniform light spot 400 with low illumination. In practical applications, this can provide ambient lighting outside the surgical field. The low illumination not only ensures that there is no reflection from objects outside the surgical field, but also avoids a significant difference in illumination between the inside and outside of the surgical field, reducing discomfort to the surgeon's eyes and thus providing eye protection. Furthermore, since the illumination of the light spot 400 decreases uniformly during adjustment, there is no need to adjust the output power of the light source 300 (e.g., LED beads). In practical applications, the optical structure adjusted to this eye-protection state is typically used in conjunction with a warm color temperature light source 300 (e.g., warm color temperature LED beads) to further reduce visual fatigue.

[0047] In some exemplary embodiments, the focal lengths of both the first convex lens 121 and the second convex lens 211 are less than or equal to 5 mm. Therefore, by setting the focal lengths of both the first convex lens 121 and the second convex lens 211 to less than or equal to 5 mm, the focal lengths of the first convex lens 121 and the second convex lens 211 can be kept as short as possible. This allows the distance between the first homogenizing lens 120 and the second homogenizing lens 210 when adjusted to their furthest point to be as small as possible, thereby reducing the overall length of the optical structure. Simultaneously, when the first convex lens 121 and the second convex lens 211 are adjusted to be in close contact (closest distance), the large curvature compound eye convex lens formed by the first convex lens 121 and the second convex lens 211 has a short focal length, resulting in a more pronounced defocus characteristic at the far end, thus forming a larger diameter light spot 400.

[0048] Specifically, the focal lengths of the first convex lens 121 and the second convex lens 211 need to balance the adjustable distance range of the first homogenizing lens 120 and the second homogenizing lens 210, as well as the impact on the overall light spot 400 (reduced illuminance) when the large curvature convex lens formed by the first homogenizing lens 120 and the second homogenizing lens 210 is shortened. The specific focal lengths of the first convex lens 121 and the second convex lens 211 need to ensure that when the first homogenizing lens 120 and the second homogenizing lens 210 are adjusted to their furthest distance, the axial length of the entire lens group is not too long. Furthermore, when the first homogenizing lens 120 and the second homogenizing lens 210 are adjusted to their closest distance, the diameter and brightness attenuation of the large light spot 400 (which can be understood as the same energy applied to a larger area resulting in reduced energy per unit area) are within the required range. The specific focal lengths of the first convex lens 121 and the second convex lens 211 need to be determined based on the final product requirements. When the focal length of the first convex lens 121 and the second convex lens 211 is 5mm, the optical simulation results show that at a working distance of 1m, the diameter d10 of the light spot 400 varies from 165mm to 335mm, which basically covers most of the operating conditions of the surgical shadowless lamp.

[0049] In some exemplary embodiments, the light-emitting surface of the first homogenizing lens 120 and the light-incident surface of the second homogenizing lens 210 are both planar. Therefore, by setting both the light-emitting surface of the first homogenizing lens 120 and the light-incident surface of the second homogenizing lens 210 to be planar, it can be ensured that when the first homogenizing lens 120 and the second homogenizing lens 210 are adjusted to their closest distance, the light-emitting surface of the first homogenizing lens 120 and the light-incident surface of the second homogenizing lens 210 can fit together without gap, forming a convex lens with a large curvature, thus still achieving the homogenizing effect.

[0050] Please continue to refer to this. Figure 2 and Figure 3 ,like Figure 2 and Figure 3 As shown, in some exemplary embodiments, the collimating lens module 110 includes a first condenser lens 111 and a second condenser lens 112. Both the light-emitting surfaces of the first condenser lens 111 and the second condenser lens 112 are convex. The second condenser lens 112 is located between the first condenser lens 111 and the first uniform lens 120. Therefore, by sequentially collimating the illumination light using the first condenser lens 111 and the second condenser lens 112, which both have convex light-emitting surfaces, not only can the light be collimated, but the collimated light can also be evenly distributed, thus achieving a better collimation effect.

[0051] Please continue to refer to this. Figure 2 and Figure 3 ,like Figure 2 and Figure 3 As shown, in some exemplary embodiments, the radius of curvature of the convex surface of the second condenser lens 112 is greater than the radius of curvature of the convex surface of the first condenser lens 111. Therefore, by setting the first condenser lens 111 with a small radius of curvature and the second condenser lens 112 with a large radius of curvature, the first condenser lens 111 with a small radius of curvature can be positioned close to the light source 300 (e.g., an LED bead) to facilitate the collection of illumination light, while the second condenser lens 112 with a large radius of curvature ensures that all illumination light can be collected, resulting in better collimation and effectively preventing stray light.

[0052] Furthermore, the light-incident surface of the first condenser lens 111 can be either a plane or a concave surface, and the light-incident surface of the second condenser lens 112 can also be either a plane or a concave surface. Preferably, the light-incident surfaces of both the first condenser lens 111 and the second condenser lens 112 are concave. Thus, by setting the light-incident surfaces of both the first condenser lens 111 and the second condenser lens 112 to be concave, the collimation effect can be improved within a limited volume, thereby further improving the collimation effect of the collimating lens module 110 and ensuring the formation of uniformly distributed parallel light.

[0053] Please continue to refer to this. Figure 2 and Figure 3 As shown, Figure 2 and Figure 3As shown, in some exemplary embodiments, the diameter of the second condenser lens 112 is equal to the diameter of the first uniform lens 120. Therefore, by setting the diameter of the first condenser lens 111 to be directly equal to that of the first uniform lens 120, it is easier to manufacture the lens barrel used to mount the first lens unit 100 and the second lens unit 200.

[0054] Please continue to refer to this. Figure 3 ,like Figure 3 As shown, in some exemplary embodiments, the focal points of the first condenser lens 111 and the second condenser lens 112 are aligned with the light-emitting point of the light source 300 (e.g., the light-emitting chip of an LED). Therefore, by aligning the focal points of the first condenser lens 111 and the second condenser lens 112 with the light-emitting point of the light source 300 (i.e., the focal points of the first condenser lens 111 and the second condenser lens 112 are located at the location of the light-emitting point of the light source 300), the collimation effect of the collimating lens module 110 can be further improved.

[0055] Please continue to refer to this. Figure 2 and Figure 3 ,like Figure 2 and Figure 3 As shown, in some exemplary embodiments, the second lens unit 200 further includes a third homogenizing lens 220, the light-incident surface of which is in contact with the light-exiting surface of the second homogenizing lens 210. Thus, by providing a third homogenizing lens 220 whose light-incident surface is in contact with the light-exiting surface of the second homogenizing lens 210, a better homogenizing effect can be achieved, effectively ensuring the formation of a light spot 400 that provides uniform illumination within the surgical field area while experiencing a sharp reduction in illumination outside the surgical field area.

[0056] In some exemplary embodiments, the light-incident surface of the third homogenizing lens 220 is planar, and the light-exiting surface of the third homogenizing lens 220 is convex. Therefore, by setting the light-incident surface of the third homogenizing lens 220 to be planar, it can be ensured that the light-incident surface of the third homogenizing lens 220 can effectively fit with the light-exiting surface of the second homogenizing lens 210; by setting the light-exiting surface of the third homogenizing lens 220 to be convex, it can achieve a focusing effect on the light, effectively reducing stray light and ensuring that the edge of the light spot 400 is sharply cut off.

[0057] Please continue to refer to this. Figure 2 and Figure 3 ,like Figure 2 and Figure 3As shown, in some exemplary embodiments, the diameter of the third homogenizing lens 220 is equal to the diameter of the second homogenizing lens 210. Therefore, by setting the diameter of the third homogenizing lens 220 to be directly equal to that of the second homogenizing lens 210, it is not only possible to effectively ensure that the light-incident surface of the third homogenizing lens 220 can be in close contact with the light-exit surface of the second homogenizing lens 210, but it also facilitates the processing of the lens barrel used to mount the first lens unit 100 and the second lens unit 200.

[0058] In some exemplary embodiments, at least 10 of the first convex lenses 121 are arranged along the diameter of the first homogenizing lens 120, and / or at least 10 of the second convex lenses 211 are arranged along the diameter of the second homogenizing lens 210. Please refer to... Figure 8 This is a schematic diagram illustrating the effect of the number of lenses in the compound eye lens of an optical structure provided in an embodiment of the present invention on the edge illuminance of the light spot 400. For example... Figure 8 As shown, since the parallel light formed after collimation by the collimating lens module 110 passes through each corresponding set of first convex lenses 121 and second convex lenses 211 and forms a consistent beam, the outermost light of the final light spot 400 originates only from the light emitted outward from the second convex lens 211 at the edge of the second homogenizing lens 210. Therefore, theoretically, when the illuminance produced by each first convex lens 121 or each second convex lens 211 is less than 10% of the total illuminance, the characteristic of d50 / d10 > 0.9 can be achieved. Furthermore, theoretically, after the illumination light is collimated by the collimating lens module 110, the first homogenizing lens 120 obtains uniformly collimated parallel light. When 10 first convex lenses 121 are evenly distributed along the diameter of the first homogenizing lens 120, and when 10 second convex lenses 211 are evenly distributed along the diameter of the second homogenizing lens 210, the illuminance produced by each first convex lens 121 and each second convex lens 211 is 10% of the total illuminance, which can reach d50 / d10 = 0.9. Considering the collimation and uniformity of the actual light source 300 and the stray light caused by possible material reflection, and the first homogenizing lens 120... Since the first convex lens 121 on the first light-diffusing lens 120 and the second convex lens 211 on the second light-diffusing lens 210 cannot be arranged without gaps, the number of first convex lenses 121 arranged on the diameter of the first light-diffusing lens 120 and the number of second convex lenses 211 arranged on the diameter of the second light-diffusing lens 210 can be appropriately increased. For example, when 20 first convex lenses 121 are evenly distributed on the diameter of the first light-diffusing lens 120 and 20 second convex lenses 211 are evenly distributed on the diameter of the second light-diffusing lens 210, the optical simulation result can reach d50 / d10 of about 0.98, and the light-diffusing effect can also be effectively improved.

[0059] In some exemplary embodiments, the second lens unit 200 is connected to a moving device (not shown) configured to drive the second lens unit 200 closer to or further away from the first lens unit 100 to adjust the distance between the first homogenizing lens 120 and the second homogenizing lens 210. Thus, by moving the second lens unit 200 closer to or further away from the first lens unit 100 to adjust the distance between the first homogenizing lens 120 and the second homogenizing lens 210, the relative positions of the collimating lens module 110 and the first homogenizing lens 120 in the first lens unit 100 are fixed, and the relative positions of the first lens unit 100 and the light source 300 are also kept fixed, thereby producing a fixed light output. Furthermore, by using a moving device to drive the second lens unit 200 closer to or further away from the first lens unit 100, not only is operation easier, but high-precision adjustment of the distance between the first homogenizing lens 120 and the second homogenizing lens 210 can also be achieved. It should be noted that, as those skilled in the art will understand, the present invention does not limit the specific structure of the mobile device. For information on the specific structure of the mobile device, please refer to relevant technologies known to those skilled in the art, which will not be elaborated here.

[0060] The present invention also provides a surgical shadowless lamp, which includes the optical structure described above. Because the surgical shadowless lamp provided by the present invention includes the optical structure described above, the surgical shadowless lamp provided by the present invention, through the collimating lens module 110, can not only collimate the light rays but also make the collimated light rays uniformly distributed; the first homogenizing lens 120 and the second homogenizing lens 210 can play a homogenizing role. The multiple first convex lenses 121 on the first homogenizing lens 120 and the multiple second convex lenses 211 on the second homogenizing lens 210 can be considered as multiple independent small light sources 300. The parallel light (illumination light) collimated by the collimating lens module 110, after passing through the first homogenizing lens 120 and the second homogenizing lens 210, will eliminate the wafer imaging spot 400 and become a uniform circular spot 400 formed by the superposition of multiple independent small light sources 300, thereby forming a spot 400 that provides uniform illumination within the surgical field area while sharply reducing illumination outside the surgical field area. Furthermore, since the distance between the first homogenizing lens 120 and the second homogenizing lens 210 is adjustable, the light spot 400 formed after the parallel light is homogenized by the first homogenizing lens 120 and the second homogenizing lens 210 gradually increases in size as the distance between them decreases. This allows for stepless adjustment of the light spot 400 size, enabling precise control of its dimensions. In summary, the surgical shadowless lamp provided by this invention uses a lens group combining multiple lenses as an integrated optical element. By moving the lenses within the lens group, different light spot sizes and distributions are achieved. This allows for full utilization of the light source 300 (e.g., LED) and optical elements, providing excellent shadowless performance without altering the overall optical path structure of the surgical shadowless lamp.

[0061] In summary, compared with the prior art, the optical structure and surgical shadowless lamp provided by the present invention have the following beneficial effects:

[0062] This invention, by setting a collimating lens module 110 before the first homogenizing lens 120, not only collimates the light rays but also ensures a uniform distribution of the collimated light rays. Since the first convex lens 121 on the first homogenizing lens 120 and the second convex lens 211 on the second homogenizing lens 210 are arranged back-to-back, with their convex surfaces facing outwards, the first homogenizing lens 120 and the second homogenizing lens 210 can achieve a homogenizing effect. The multiple first convex lenses 121 on the first homogenizing lens 120 and the multiple second convex lenses 211 on the second homogenizing lens 210 can be considered as multiple independent small light sources 300. The parallel light collimated by the collimating lens module 110, after passing through the first homogenizing lens 120 and the second homogenizing lens 210, eliminates the wafer imaging spot 400, transforming it into a uniform circular spot 400 formed by the superposition of multiple independent small light sources 300. This results in a spot 400 that provides uniform illumination within the surgical field while sharply reducing illumination outside the surgical field. Furthermore, since the distance between the first uniform light lens 120 and the second uniform light lens 210 is adjustable, the light spot 400 formed by the illumination light after passing through the first lens unit 100 and the second lens unit 200 gradually increases in size as the distance between the first uniform light lens 120 and the second uniform light lens 210 decreases. This allows for stepless adjustment of the light spot 400 size and precise control of its size. In summary, this invention uses a lens group combining multiple lenses as an integrated optical element. By moving the lenses within the lens group, different light spot sizes and distributions are achieved. This allows for full utilization of the light source 300 (e.g., LED beads) and optical elements, providing excellent shadowless effects without altering the overall optical path structure of the surgical shadowless lamp.

[0063] It should be noted that, in the description of this specification, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] It should also be noted that the above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure are within the protection scope of the present invention. Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the present invention and its equivalents, the present invention also intends to include these modifications and variations.

Claims

1. An optical structure, characterized by, The first lens unit and the second lens unit are arranged along an optical path; The first lens unit comprises a collimating lens module and a first homogenizing lens, the collimating lens module is configured to collimate the received illumination light to form parallel light uniformly distributed, the first homogenizing lens comprises a plurality of first convex lenses arranged in an array of compound eyes, the light entrance surface of the first convex lens is arranged towards the light exit surface of the collimating lens module, and the light entrance surface of the first convex lens is convex; The second lens unit comprises a second homogenizing lens, the second homogenizing lens comprises a plurality of second convex lenses arranged in an array of compound eyes, the plurality of second convex lenses are arranged one by one corresponding to the plurality of first convex lenses, the light entrance surface of the second convex lens is arranged towards the light exit surface of the corresponding first convex lens, and the light exit surface of the second convex lens is convex; The distance between the first homogenizing lens and the second homogenizing lens is adjustable, and the light spot formed after the parallel light is homogenized by the first homogenizing lens and the second homogenizing lens gradually becomes larger as the distance between the first homogenizing lens and the second homogenizing lens decreases.

2. The optical structure of claim 1, wherein, The collimating lens module comprises a first converging lens and a second converging lens, the light exit surface of the first converging lens and the light exit surface of the second converging lens are both convex, and the second converging lens is located between the first converging lens and the first homogenizing lens.

3. The optical structure of claim 2, wherein, The radius of curvature of the convex surface of the second converging lens is greater than the radius of curvature of the convex surface of the first converging lens.

4. The optical structure of claim 1, wherein, There are at least 10 first convex lenses arranged along the diameter of the first homogenizing lens, and / or there are at least 10 second convex lenses arranged along the diameter of the second homogenizing lens.

5. The optical structure of claim 1, wherein, The focal length of the first convex lens is equal to the focal length of the second convex lens, and the farthest adjustable distance between the first homogenizing lens and the second homogenizing lens is equal to twice the focal length.

6. The optical structure of claim 1, wherein, When the distance between the first homogenizing lens and the second homogenizing lens is adjusted to the closest, the light exit surface of the first homogenizing lens is fitted with the light entrance surface of the second homogenizing lens.

7. The optical structure of claim 6, wherein, The light exit surface of the first homogenizing lens and the light entrance surface of the second homogenizing lens are both flat.

8. The optical structure of claim 1, wherein, The second lens unit further comprises a third homogenizing lens, the light entrance surface of the third homogenizing lens is fitted with the light exit surface of the second homogenizing lens.

9. The optical structure of claim 8, wherein, The light entrance surface of the third homogenizing lens is flat, and the light exit surface of the third homogenizing lens is convex.

10. The optical structure of claim 1, wherein, The second lens unit is connected with a mobile device, and the mobile device is configured to drive the second lens unit to move close to or away from the first lens unit to adjust the distance between the first homogenizing lens and the second homogenizing lens.

11. A surgical shadowless lamp, characterized in that The surgical shadowless lamp comprises the optical structure of any one of claims 1 to 10.

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