Optical structure and operating shadowless lamp

Abstract

The utility model provides an optical structure and an operation 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 utility model, stepless adjustment of the spot size can be realized, and the spot size can be accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lighting, and particularly relates to an optical structure and a surgical shadowless lamp. Background Technique

[0002] The surgical shadowless lamp is an important and indispensable device for illuminating the surgical site. In application, the surgical shadowless lamp needs to change the spot size and the light distribution within the spot according to the surgical requirements to meet the needs of different types of surgeries or surgeries with different incision sizes. At the same time, the surgical shadowless lamp needs to provide a good shadowless rate to ensure that there is sufficient illumination in the surgical field when occlusion occurs during the surgery.

[0003] Currently, the mainstream surgical shadowless lamps use LEDs in combination with optical elements to provide illumination. The optical elements provide fixed optical characteristics, and the optical characteristic adjustment function is achieved by arranging more LEDs and optical elements. Different groups of LEDs are electronically controlled for brightness to achieve different spot sizes and illuminance distributions. Therefore, not all LEDs and optical elements can be fully utilized, which will have an adverse impact on the shadowless effect of the surgical shadowless lamp.

[0004] At the same time, according to the requirement of the uniformity of the spot in the surgical shadowless lamp standard YY9706.241, during the process of spot change, it should be satisfied that at illuminances of 1 / 2 and 1 / 10 of the central illuminance, the ratio of the spot diameter d50 to d10 at a distance of 1 m from the light source should satisfy the requirement that the d50 / d10 value is not less than 0.5. The highest d50 / d10 value that can be achieved by the current conventional lens technology is about 0.6. Please refer to Figure 1 , which is a schematic diagram of the illuminance distribution within the spot that can be achieved by the conventional lens technology.

[0005] It should be noted that the information disclosed in the background technique part of this utility model is only intended to deepen the understanding of the general background technique of this utility model, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Content of the Utility Model

[0006] The purpose of the utility model is to provide an optical structure and a surgical shadowless lamp, which can not only form a spot with uniform illuminance in the surgical field area and a sharp reduction in illuminance outside the surgical field area, but also achieve stepless adjustment of the spot size and accurately control the spot size.

[0007] To achieve the above goal, the utility model provides an optical structure, which includes a first lens unit and a second lens unit arranged along the optical path;

[0008] The first lens unit includes a collimating lens module and a first light homogenizing lens. The collimating lens module is configured to collimate the received illumination light to form uniformly distributed parallel light. The first light homogenizing lens includes a plurality of first convex lenses distributed in a fly-eye array. The incident light surface of the first convex lens faces the light-emitting surface of the collimating lens module, and the incident light surface of the first convex lens is a convex surface;

[0009] The second lens unit includes a second light homogenizing lens. The second light homogenizing lens includes a plurality of second convex lenses distributed in a fly-eye array. The plurality of second convex lenses are arranged in one-to-one correspondence with the plurality of first convex lenses. The incident light surface of the second convex lens faces the light-emitting surface of the corresponding first convex lens, and the light-emitting surface of the second convex lens is a convex surface;

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

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

[0014] Optionally, at least 10 of the second convex lenses are arranged along the diameter of the second light 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 farthest adjustable distance between the first light homogenizing lens and the second light homogenizing lens is equal to twice the focal length.

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

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

[0018] Optionally, the second lens unit further includes a third light homogenizing lens. The incident light surface of the third light homogenizing lens is in contact with the light-emitting surface of the second light homogenizing lens.

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

[0020] Optionally, the second lens unit is connected to a moving device, and the moving device is configured to drive the second lens unit to approach or move away from the first lens unit so as to adjust the distance between the first light homogenizing lens and the second light homogenizing lens.

[0021] To achieve the above object, the present utility model further provides a surgical shadowless lamp, and the surgical shadowless lamp includes the optical structure described above.

[0022] Compared with the prior art, the optical structure and the surgical shadowless lamp provided by the present utility model have the following

[0023] Advantageous effects:

[0024] Since the optical structure provided by the present utility model 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 light homogenizing lens, the collimating lens module is configured to collimate the received illumination light to form uniformly distributed parallel light, the first light homogenizing lens includes a plurality of first convex lenses distributed in a fly-eye array, the incident surface of the first convex lens faces the exit surface of the collimating lens module, and the incident surface of the first convex lens is a convex surface; the second lens unit includes a second light homogenizing lens, the second light homogenizing lens includes a plurality of second convex lenses distributed in a fly-eye array, the plurality of second convex lenses are arranged in one-to-one correspondence with the plurality of first convex lenses, the incident surface of the second convex lens faces the exit surface of the corresponding first convex lens, and the exit surface of the second convex lens is a convex surface. Thus, by providing the collimating lens module, not only can the light be collimated but also the collimated light can be uniformly distributed; the first light homogenizing lens and the second light homogenizing lens can play a role in light homogenization. The plurality of first convex lenses on the first light homogenizing lens and the plurality of second convex lenses on the second light homogenizing lens can be regarded as a plurality of independent small light sources. After the parallel light (illumination light) collimated by the collimating lens module passes through the first light homogenizing lens and the second light homogenizing lens, the spot of the wafer imaging will be eliminated and become a uniform circular spot formed by the superposition of a plurality of independent small light sources, so that a spot that provides uniform illuminance in the surgical field area and a sharp reduction in illuminance outside the surgical field area can be formed. In addition, since the distance between the first light homogenizing lens and the second light homogenizing lens is adjustable, the spot formed after the parallel light is homogenized by the first light homogenizing lens and the second light homogenizing lens gradually becomes larger as the distance between the first light homogenizing lens and the second light homogenizing lens decreases. Thus, stepless adjustment of the spot size can be achieved, and the spot size can be precisely controlled. In summary, the optical structure provided by the present utility model uses a lens group combined with multiple lenses as an integrated optical element. By moving the lenses within the lens group, effects of different spot sizes and different spot distributions are generated. Thus, the light source (such as an LED) and the 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.

[0025] Since the surgical shadowless lamp provided by the present utility model and the optical structure provided by the present utility model belong to the same inventive concept, the surgical shadowless lamp provided by the present utility model has all the beneficial effects of the optical structure provided by the present utility model. For specific references, please refer to the relevant descriptions in the above text. Therefore, the beneficial effects of the surgical shadowless lamp provided by the present utility model will not be elaborated one by one here. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the illuminance distribution within the spot that can be achieved by conventional lens technology;

[0027] Figure 2 Schematic diagram of the overall structure of the optical structure provided by an embodiment of the present utility model;

[0028] Figure 3 Optical path simulation diagram of the optical structure provided by an embodiment of the present utility model;

[0029] Figure 4 Schematic diagram of spot formation when the distance between the first light homogenizing lens and the second light homogenizing lens in the optical structure provided by an embodiment of the present utility model is adjusted to the farthest;

[0030] Figure 5 Schematic diagram of the illuminance distribution within the spot when the distance between the first light homogenizing lens and the second light homogenizing lens in the optical structure provided by an embodiment of the present utility model is adjusted to the farthest;

[0031] Figure 6 Schematic diagram of spot formation when the distance between the first light homogenizing lens and the second light homogenizing lens in the optical structure provided by an embodiment of the present utility model is adjusted to the nearest;

[0032] Figure 7 Schematic diagram of the illuminance distribution within the spot when the distance between the first light homogenizing lens and the second light homogenizing lens in the optical structure provided by an embodiment of the present utility model is adjusted to the nearest;

[0033] Figure 8 Schematic diagram of the influence of the number of lenses of the compound eye lens in the optical structure provided by an embodiment of the present utility model on the illuminance at the spot edge.

[0034] Among them, the reference numerals are as follows:

[0035] The first lens unit - 100; the collimating lens module - 110; the first condenser lens - 111; the second condenser lens - 112; the first light homogenizing lens - 120; the first convex lens - 121;

[0036] The second lens unit - 200; the second light homogenizing lens - 210; the second convex lens - 211; the third light homogenizing lens - 220;

[0037] The light source - 300; the spot - 400. Specific embodiments

[0038] The following further elaborates on the optical structure and surgical shadowless lamp proposed by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are in a very simplified form and all use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model. In order to make the purpose, features, and advantages of the present utility model more obvious and understandable, please refer to the accompanying drawings. It should be known that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Any modification of the structure, change in the proportional relationship, or adjustment of the size, in the case of being the same or similar to the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model. The specific design features of the present utility model disclosed herein, such as specific dimensions, directions, positions, and shapes, will be partially determined by the specific application and usage environment. Also, in the embodiments described below, sometimes the same reference numerals are used commonly between different drawings to represent the same parts or parts with the same functions, and the repeated description thereof is omitted. In this specification, similar reference numerals and letters are used to represent similar items. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0039] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, it cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Also, the terms "comprising", "including", or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article, or device comprising the said element. The singular forms "a", "an", and "the" include plural objects. The term "or" is generally used in the sense of including "and / or". The term "several" is generally used in the sense of including "at least one". The term "at least two" is generally used in the sense of including "two or more". The term "multiple" is generally used in the sense of including "at least two".

[0040] In addition, in the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The core idea of the present invention is to provide an optical structure and an operating shadowless lamp, which can not only form a light spot with uniform illuminance in the surgical field area and a sharp reduction in illuminance outside the surgical field area, but also achieve stepless adjustment of the light spot size and precisely control the light spot size.

[0042] To achieve the above idea, the present invention provides an optical structure. Please refer to Figure 2 and Figure 3 , where Figure 2 is the overall structure schematic diagram of the optical structure provided by an embodiment of the present invention;

[0043] Figure 3 is the optical path simulation diagram of the optical structure provided by an embodiment of the present invention. As shown in Figure 2 and Figure 3 , 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 light homogenizing lens 120. The collimating lens module 110 is configured to collimate the received illumination light to form uniformly distributed parallel light. The first light homogenizing lens 120 includes a plurality of first convex lenses 121 distributed in a fly-eye array (see Figure 4 ), the incident light surface of the first convex lens 121 is arranged facing the outgoing light surface of the collimating lens module 110, and the incident light surface of the first convex lens 121 is a convex surface; the second lens unit 200 includes a second light homogenizing lens 210, and the second light homogenizing lens 210 includes a plurality of second convex lenses 211 distributed in a fly-eye array (seeFigure 4 ), the multiple second convex lenses 211 are arranged in one-to-one correspondence with the multiple first convex lenses 121. The incident light surface of the second convex lens 211 faces the outgoing light surface of the correspondingly arranged first convex lens 121, and the outgoing light surface of the second convex lens 211 is a convex surface; the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjustable, and the light spot 400 formed after the illumination light passes through the first lens unit 100 and the second lens unit 200 (see Figure 4 ) gradually becomes larger as the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 decreases.

[0044] Thus, by providing the collimating lens module 110, not only can the light be collimated but also the collimated light can be evenly distributed; the first light homogenizing lens 120 and the second light homogenizing lens 210 can play a role in light homogenization. The multiple first convex lenses 121 on the first light homogenizing lens 120 and the multiple second convex lenses 211 on the second light homogenizing lens 210 can be regarded as multiple independent small light sources 300. After the parallel light (illumination light) collimated by the collimating lens module 110 passes through the first light homogenizing lens 120 and the second light homogenizing lens 210, the light spot 400 of the wafer imaging will be eliminated and become a uniform circular light spot 400 formed by the superposition of multiple independent small light sources 300, so that a light spot 400 can be formed that provides uniform illuminance in the surgical field area and has a sharp reduction in illuminance outside the surgical field area. In addition, since the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjustable, the light spot 400 formed after the parallel light is homogenized by the first light homogenizing lens 120 and the second light homogenizing lens 210 gradually becomes larger as the distance (the maximum distance is the sum of the focal lengths of the first convex lens 121 and the second convex lens 211) between the first light homogenizing lens 120 and the second light homogenizing lens 210 decreases. Thus, stepless adjustment of the size of the light spot 400 can be realized, and the size of the light spot 400 can be accurately controlled. In summary, the optical structure provided by the present invention uses a lens group combined with multiple lenses as an integrated optical element. By moving the lenses in the lens group, effects of different light spot 400 sizes and different light spot 400 distributions are generated. Thus, the light source 300 (such as an LED lamp bead) and the 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.

[0045] It should be noted that, as can be understood by those skilled in the art, the optical structure provided by the present invention can be arranged in one-to-one correspondence with the light source 300 (such as an LED lamp bead). In addition, it should be noted that Figure 3 the shown optical path simulation diagram is obtained by simulating with LightTools software, and is Figure 3It can be seen that the optical structure provided by the present utility model can collimate light, and the light spot is uniform without wafer imaging defects. It should also be noted that, as can be understood by those skilled in the art, the light-emitting position of the LED lamp bead is the wafer part. There are small grids (lattices) on the wafer, and the shape of the wafer may not be circular. In illumination optics, wafer imaging refers to the appearance of an image with the same shape as the wafer and individual small grids in the illumination area (similar to the effect of a projector). Since uniform light spots are required for illumination, this wafer imaging is considered a defect.

[0046] Please continue to refer to Figure 2 and Figure 3 , as Figure 2 and Figure 3 shown, in some exemplary embodiments, the diameter of the first light homogenizing lens 120 is equal to the diameter of the second light homogenizing lens 210. Since the diameter of the first light homogenizing lens 120 is equal to the diameter of the second light homogenizing lens 210, two compound eye convex lenses with exactly the same structure but opposite installation directions can be used as the first light homogenizing lens 120 and the second light homogenizing lens 210 respectively, thereby reducing the types of lenses and lowering the production cost.

[0047] 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 farthest adjustable distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is equal to twice the focal length. Thus, 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 more convenient to adjust the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 to achieve stepless adjustment of the size of the light spot 400 and precisely control the size of the light spot 400. By setting the farthest adjustable distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 to be twice the focal length, parallel light will be focused at the focal point of the corresponding second convex lens 211 on the second light homogenizing lens 210 after passing through the first convex lens 121 on the first light homogenizing lens 120. Since the structures of the first light homogenizing lens 120 and the second light homogenizing lens 210 are the same, and the focal lengths of the first convex lens 121 and the second convex lens 211 are also the same, the focused light can be converted into parallel light after passing through the second light homogenizing lens 210. At this time, the formed light spot 400 is the smallest, as Figure 4 shown, which is a schematic diagram of the formation of the light spot 400 when the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 in the optical structure provided by an embodiment of the present utility model is adjusted to the farthest, and d50 / d10 is the largest, approaching 1. At this time, the illuminance distribution within the light spot 400 is as Figure 5As shown, it is a schematic diagram of the illuminance distribution within the light spot 400 when the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 in the optical structure provided by an embodiment of the present utility model is adjusted to the farthest. From Figure 5 it can be seen that when the first light homogenizing lens 120 and the second light homogenizing lens 210 are adjusted to be the farthest apart (twice the focal length), the illuminance within 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, effectively avoiding the deviation in doctors' observation caused by the difference in illuminance.

[0048] In some exemplary embodiments, when the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjusted to the nearest, the light-emitting surface of the first light homogenizing lens 120 is in contact with the light-incident surface of the second light homogenizing lens 210. Since when the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjusted to the nearest, the light-emitting surface of the first light homogenizing lens 120 is in contact with the light-incident surface of the second light homogenizing lens 210, at this time, the first light homogenizing lens 120 and the second light homogenizing lens 210 can integrally form a convex lens with a large curvature, and the formed light spot 400 is the largest, as Figure 6 shown, it is a schematic diagram of the formation of the light spot 400 when the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 in the optical structure provided by an embodiment of the present utility model is adjusted to the nearest. At this time, the illuminance distribution within the light spot 400 is as Figure 7 shown, it is a schematic diagram of the illuminance distribution within the light spot 400 when the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 in the optical structure provided by an embodiment of the present utility model is adjusted to the nearest. As Figure 7 shown, the adjustment state where the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjusted to the nearest can provide a large and uniform light spot 400 with low illuminance. In practical applications, it can provide ambient light illumination outside the surgical field area. The low illuminance can not only ensure that there is no reflection of objects outside the surgical field area, but also avoid the illuminance contrast between inside and outside the surgical field area, reducing the discomfort of doctors' eyes, thus providing an eye protection function. And during the adjustment process, since the illuminance of the light spot 400 decreases uniformly, there is no need to additionally adjust the output power of the light source 300 (such as an LED lamp bead). Further, in practical applications, the optical structure adjusted to this eye protection state is usually used in cooperation with a warm-color temperature light source 300 (such as a warm-color temperature LED lamp bead) to further reduce visual fatigue.

[0049] In some exemplary embodiments, the focal lengths of the first convex lens 121 and the second convex lens 211 are both less than or equal to 5 mm. Thus, by setting the focal lengths of the first convex lens 121 and the second convex lens 211 to be less than or equal to 5 mm, it can be ensured that the focal lengths of the first convex lens 121 and the second convex lens 211 are as short as possible, so that the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 when adjusted to the farthest distance can be as small as possible, thereby reducing the length dimension of the entire optical structure. At the same time, when the first convex lens 121 and the second convex lens 211 are adjusted to be in contact with each other (the closest distance), the focal length of the compound eye convex lens with a large curvature formed by the first convex lens 121 and the second convex lens 211 is short, resulting in a more obvious defocus characteristic at the distal end to form a light spot 400 with a larger diameter.

[0050] Specifically, the specific values of 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 light homogenizing lens 120 and the second light homogenizing lens 210 and the influence on the entire light spot 400 (the illuminance will decrease) after the focal length of the large-curvature convex lens formed when the first light homogenizing lens 120 and the second light homogenizing lens 210 are in contact becomes shorter. The specific values of the focal lengths of the first convex lens 121 and the second convex lens 211 need to ensure that when the first light homogenizing lens 120 and the second light homogenizing lens 210 are adjusted to the farthest distance, the axial length of the entire lens group is not too long, and it is necessary to ensure that when the first light homogenizing lens 120 and the second light homogenizing lens 210 are adjusted to the closest distance, the diameter and brightness attenuation of the formed large light spot 400 (it can be understood that the same energy is placed on a larger area, and the energy per unit area decreases) are within the required range. The specific values of the focal lengths of the first convex lens 121 and the second convex lens 211 need to be determined according to the final product requirement indicators. When the focal lengths of the first convex lens 121 and the second convex lens 211 are 5 mm, it can be known from the optical simulation results that at a working distance of 1 m, the change range of the diameter d10 of the light spot 400 is 165 mm to 335 mm, which basically covers the vast majority of usage conditions of the surgical shadowless lamp.

[0051] In some exemplary embodiments, the light-emitting surface of the first light homogenizing lens 120 and the light-incident surface of the second light homogenizing lens 210 are both flat surfaces. Thus, by setting the light-emitting surface of the first light homogenizing lens 120 and the light-incident surface of the second light homogenizing lens 210 to be flat surfaces, it can be ensured that when the first light homogenizing lens 120 and the second light homogenizing lens 210 are adjusted to the closest distance, the light-emitting surface of the first light homogenizing lens 120 and the light-incident surface of the second light homogenizing lens 210 can be in contact without gaps to form a large-curvature convex lens as a whole, still achieving the light homogenizing effect.

[0052] Please continue to refer to Figure 2 and Figure 3 as Figure 2 and Figure 3 shown, in some exemplary embodiments, the collimating lens module 110 includes a first condenser lens 111 and a second condenser lens 112. The light-emitting surfaces of the first condenser lens 111 and the second condenser lens 112 are both convex surfaces. The second condenser lens 112 is located between the first condenser lens 111 and the first light homogenizing lens 120. Thus, by using the first condenser lens 111 and the second condenser lens 112 with convex light-emitting surfaces to collimate the illumination light in sequence, not only can the light be collimated but also the collimated light can be evenly distributed, thereby achieving a better collimation effect.

[0053] Please continue to refer to Figure 2 and Figure 3 as Figure 2 and Figure 3 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. Thus, 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 arranged close to the light source 300 (such as an LED lamp bead) to facilitate the collection of illumination light, and the second condenser lens 112 with a large radius of curvature can ensure that all the illumination light can be collected to achieve a better collimation effect and effectively avoid the appearance of stray light.

[0054] Furthermore, the light-incident surface of the first condenser lens 111 can be a plane or a concave surface, and the light-incident surface of the second condenser lens 112 can be a plane or a concave surface. Preferably, the light-incident surfaces of the first condenser lens 111 and the second condenser lens 112 are both concave surfaces. Thus, by setting the light-incident surfaces of the first condenser lens 111 and the second condenser lens 112 to be concave surfaces, the collimation effect can be improved within a limited volume, thereby further improving the collimation effect of the collimating lens module 110 and ensuring that parallel light with uniform distribution can be formed.

[0055] Please continue to refer to Figure 2 and Figure 3 shown, as 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 light homogenizing lens 120. Thus, by setting the diameter of the first condenser lens 111 to be equal to the diameter of the first light homogenizing lens 120, it is more convenient for the processing of the lens barrel for mounting the first lens unit 100 and the second lens unit 200.

[0056] Please continue to refer to Figure 3 , as Figure 3 shown, in some exemplary embodiments, the foci 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 wafer of the LED lamp bead). Thus, by aligning the foci 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 foci of the first condenser lens 111 and the second condenser lens 112 are located at the position of the light emitting point of the light source 300), the collimation effect of the collimating lens module 110 can be further improved.

[0057] Please continue to refer to Figure 2 and Figure 3 , as Figure 2 and Figure 3 shown, in some exemplary embodiments, the second lens unit 200 further includes a third light homogenizing lens 220, and the incident light surface of the third light homogenizing lens 220 is attached to the outgoing light surface of the second light homogenizing lens 210. Thus, by providing the third light homogenizing lens 220 with its incident light surface attached to the outgoing light surface of the second light homogenizing lens 210, a better light homogenizing effect can be achieved to effectively ensure that a light spot 400 can be formed to provide uniform illuminance within the surgical field area while the illuminance sharply decreases outside the surgical field area.

[0058] In some exemplary embodiments, the incident light surface of the third light homogenizing lens 220 is a plane, and the outgoing light surface of the third light homogenizing lens 220 is a convex surface. Thus, by setting the incident light surface of the third light homogenizing lens 220 as a plane, it can be ensured that the incident light surface of the third light homogenizing lens 220 can be effectively attached to the outgoing light surface of the second light homogenizing lens 210; by setting the outgoing light surface of the third light homogenizing lens 220 as a convex surface, a light gathering effect on the light can be achieved, effectively reducing stray light and ensuring a sharp cut-off at the edge of the light spot 400.

[0059] Please continue to refer to Figure 2 and Figure 3 , as Figure 2 and Figure 3As shown, in some exemplary embodiments, the diameter of the third light homogenizing lens 220 is equal to the diameter of the second light homogenizing lens 210. Thus, by setting the diameter of the third light homogenizing lens 220 to be equal to the diameter of the second light homogenizing lens 210, not only can it effectively ensure that the incident light surface of the third light homogenizing lens 220 can be fitted to the outgoing light surface of the second light homogenizing lens 210, but also it is more convenient for the processing of the lens barrel for mounting the first lens unit 100 and the second lens unit 200.

[0060] In some exemplary embodiments, at least 10 first convex lenses 121 are arranged along the diameter of the first light homogenizing lens 120, and / or at least 10 second convex lenses 211 are arranged along the diameter of the second light homogenizing lens 210. Please refer to Figure 8 , which is a schematic diagram showing the influence of the number of lenses of the compound eye lens in the optical structure provided by an embodiment of the present invention on the edge illuminance of the light spot 400. As Figure 8 shown, since the parallel light formed after being collimated by the collimating lens module 110 forms a consistent light beam after passing through each corresponding set of first convex lens 121 and second convex lens 211, the outermost light rays of the finally formed light spot 400 only come from the light rays emitted by the second convex lens 211 at the edge of the second light homogenizing lens 210 to the outside of the light spot 400. Therefore, theoretically, when the illuminance generated 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. Also, since theoretically after the illumination light is collimated by the collimating lens module 110, the first light homogenizing lens 120 receives uniform collimated parallel light. When 10 first convex lenses 121 are evenly distributed on the diameter of the first light homogenizing lens 120, and when 10 second convex lenses 211 are evenly distributed on the diameter of the second light homogenizing lens 210, the illuminance generated by each first convex lens 121 and each second convex lens 211 is 10% of the total illuminance, and d50 / d10 = 0.9 can be achieved. Considering the collimation, uniformity of the actual light source 300 and the stray light caused by possible material reflection, and the first convex lenses 121 on the first light homogenizing lens 120 and the second convex lenses 211 on the second light homogenizing lens 210 cannot be arranged without gaps, so the number of first convex lenses 121 arranged on the diameter of the first light homogenizing lens 120 and the number of second convex lenses 211 arranged on the diameter of the second light homogenizing lens 210 can be appropriately increased. For example, when 20 first convex lenses 121 are evenly distributed on the diameter of the first light homogenizing lens 120 and 20 second convex lenses 211 are evenly distributed on the diameter of the second light homogenizing lens 210, the optical simulation result can reach d50 / d10 of about 0.98, and at the same time, the light homogenizing effect can be effectively improved.

[0061] In some exemplary embodiments, the second lens unit 200 is connected to a mobile device (not shown in the figure), and the mobile device is configured to drive the second lens unit 200 closer to or farther from the first lens unit 100 to adjust the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210. Thus, by moving the second lens unit 200 closer to or farther from the first lens unit 100 to adjust the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210, it is possible to ensure that the relative position between the collimating lens module 110 and the first light homogenizing lens 120 in the first lens unit 100 is fixed and the relative position between the first lens unit 100 and the light source 300 is also fixed, so that a fixed light output can be generated. In addition, by using a mobile device to drive the second lens unit 200 closer to or farther from the first lens unit 100, not only is it more convenient to operate, but also high-precision adjustment of the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 can be achieved. It should be noted that, as can be understood by those skilled in the art, the specific structure of the mobile device is not limited in the present invention, and the specific structure of the mobile device can refer to the related technologies well-known to those skilled in the art, and will not be elaborated here.

[0062] The present utility model further provides a surgical shadowless lamp, and the surgical shadowless lamp includes the optical structure described above. Since the surgical shadowless lamp provided by the present utility model includes the optical structure described above, the surgical shadowless lamp provided by the present utility model can not only collimate light but also make the collimated light evenly distributed through the collimating lens module 110; the first light homogenizing lens 120 and the second light homogenizing lens 210 can play a role in light homogenization. The multiple first convex lenses 121 on the first light homogenizing lens 120 and the multiple second convex lenses 211 on the second light homogenizing lens 210 can be regarded as multiple independent small light sources 300. After the parallel light (illumination light) collimated by the collimating lens module 110 passes through the first light homogenizing lens 120 and the second light homogenizing lens 210, the spot 400 of the wafer imaging will be eliminated and become a uniform circular spot 400 formed by the superposition of multiple independent small light sources 300, so that a spot 400 can be formed to provide uniform illuminance in the surgical field area while the illuminance sharply decreases outside the surgical field area. In addition, since the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjustable, the spot 400 formed after the parallel light is homogenized by the first light homogenizing lens 120 and the second light homogenizing lens 210 gradually becomes larger as the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 decreases. Thus, stepless adjustment of the spot 400 size can be realized, and the spot 400 size can be accurately controlled. In summary, the surgical shadowless lamp provided by the present utility model uses a lens group combined with multiple lenses as an integrated optical element. By moving the lenses in the lens group, effects of different spot 400 sizes and different spot 400 distributions are generated. Thus, the light source 300 (such as an LED) and the 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.

[0063] In summary, compared with the prior art, the optical structure and the surgical shadowless lamp provided by the present utility model have the following beneficial effects:

[0064] In the present utility model, a collimating lens module 110 is arranged before the first light homogenizing lens 120, which can not only collimate light but also make the collimated light evenly distributed. Since the first convex lens 121 on the first light homogenizing lens 120 and the second convex lens 211 on the second light homogenizing lens 210 are arranged back to back, and the convex surfaces of both face outward, the first light homogenizing lens 120 and the second light homogenizing lens 210 can play a role in light homogenization. The multiple first convex lenses 121 on the first light homogenizing lens 120 and the multiple second convex lenses 211 on the second light homogenizing lens 210 can be regarded as multiple independent small light sources 300. After the parallel light collimated by the collimating lens module 110 passes through the first light homogenizing lens 120 and the second light homogenizing lens 210, the light spot 400 of the wafer imaging will be eliminated and become a uniform circular light spot 400 formed by the superposition of multiple independent small light sources 300, so as to form a light spot 400 that provides uniform illumination in the surgical field area and has a sharp reduction in illumination outside the surgical field area. In addition, since the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 is adjustable, the light spot 400 formed after the illumination light passes through the first lens unit 100 and the second lens unit 200 gradually becomes larger as the distance between the first light homogenizing lens 120 and the second light homogenizing lens 210 decreases. Thus, stepless adjustment of the size of the light spot 400 can be achieved, and the size of the light spot 400 can be accurately controlled. In summary, the present utility model uses a lens group combined with multiple lenses as an integrated optical element. By moving the lenses in the lens group, effects of different light spot 400 sizes and different light spot 400 distributions are generated. Thus, the light source 300 (such as an LED lamp bead) and the 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.

[0065] It should be noted that in the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0066] It should also be noted that the above description is only a description of the preferred embodiments of the present utility model, and does not limit the scope of the present utility model in any way. Any changes and modifications made by those of ordinary skill in the art of the present utility model based on the above disclosure fall within the protection scope of the present utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations fall within the scope of the present utility model and its equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. An optical structure, characterized in that: comprising a first lens unit and a second lens unit arranged along an optical path; The first lens unit includes a collimating lens module and a first light homogenizing lens, the collimating lens module is configured to collimate the received illumination light to form uniformly distributed parallel light, the first light homogenizing lens includes a plurality of first convex lenses distributed in a compound eye array, the light incident surface of the first convex lens is arranged toward the light exit surface of the collimating lens module, and the light incident surface of the first convex lens is a convex surface; The second lens unit includes a second light homogenizing lens, the second light homogenizing lens includes a plurality of second convex lenses distributed in a compound eye array, the plurality of second convex lenses are arranged in one-to-one correspondence with the plurality of first convex lenses, the light incident surface of the second convex lens is arranged toward the light emitting surface of the correspondingly arranged first convex lens, and the light emitting surface of the second convex lens is a convex surface; The distance between the first light homogenizing lens and the second light homogenizing lens is adjustable, and the light spot formed after the parallel light is homogenized by the first light homogenizing lens and the second light homogenizing lens gradually increases as the distance between the first light homogenizing lens and the second light homogenizing lens decreases.

2. The optical structure according to claim 1, characterized in that: The collimating lens module includes a first condensing lens and a second condensing lens, the light exiting surface of the first condensing lens and the light exiting surface of the second condensing lens are both convex surfaces, and the second condensing lens is located between the first condensing lens and the first light homogenizing lens.

3. The optical structure according to claim 2, characterized in that: The curvature radius of the convex surface of the second condensing lens is greater than the curvature radius of the convex surface of the first condensing lens.

4. The optical structure according to claim 1, characterized in that: At least 10 first convex lenses are arranged along the diameter of the first light homogenizing lens, and / or at least 10 second convex lenses are arranged along the diameter of the second light homogenizing lens.

5. The optical structure according to claim 1, characterized in that: 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 light homogenizing lens and the second light homogenizing lens is equal to twice the focal length.

6. The optical structure according to claim 1, characterized in that: When the distance between the first light homogenizing lens and the second light homogenizing lens is adjusted to be the shortest, the light exiting surface of the first light homogenizing lens is in contact with the light incident surface of the second light homogenizing lens.

7. The optical structure according to claim 6, characterized in that: The light exiting surface of the first light homogenizing lens and the light incident surface of the second light homogenizing lens are both planes.

8. The optical structure according to claim 1, characterized in that: The second lens unit further includes a third light homogenizing lens, and a light incident surface of the third light homogenizing lens is in contact with a light emitting surface of the second light homogenizing lens.

9. The optical structure according to claim 8, characterized in that: The light incident surface of the third light homogenizing lens is a plane, and the light exiting surface of the third light homogenizing lens is a convex surface.

10. The optical structure according to claim 1, characterized in that: The second lens unit is connected to a moving device, and the moving device is configured to drive the second lens unit to approach or move away from the first lens unit to adjust the distance between the first light uniforming lens and the second light uniforming lens.

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

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