CN220436321U - Optical lens, lighting device and operating lamp - Google Patents
Optical lens, lighting device and operating lamp Download PDFInfo
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- CN220436321U CN220436321U CN202321572891.9U CN202321572891U CN220436321U CN 220436321 U CN220436321 U CN 220436321U CN 202321572891 U CN202321572891 U CN 202321572891U CN 220436321 U CN220436321 U CN 220436321U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 311
- 238000005286 illumination Methods 0.000 claims abstract description 48
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 201000009310 astigmatism Diseases 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
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Abstract
The utility model discloses an optical lens, an illumination device and an operating lamp, wherein the optical lens is used for shaping emergent light of a light source and comprises an incidence groove, a first optical interface and a second optical interface, the emergent light of the light source enters the optical lens through the incidence groove, the first optical interface is arranged at one end of the optical lens opposite to the incidence groove, so that light with an angle smaller than or equal to a preset angle in the light entering the optical lens is refracted out through the first optical interface and is emitted into a preset illumination area; the second optical interface is arranged at the side part of the optical lens, so that the light with an angle larger than a preset angle in the light entering the optical lens is incident to the second optical interface, the light is totally reflected at the second optical interface, the reflected light is further refracted out of the optical lens and is emitted into a preset illumination area, and the optical lens enables two parts of light to be emitted into the preset illumination area, so that astigmatism is avoided, and the light energy utilization rate can be improved.
Description
Technical Field
The utility model relates to the technical field of illumination, in particular to an optical lens. The utility model also relates to a lighting device and an operating lamp.
Background
The operating lamp is applied to operating room illumination, and is required to have good shadowless effect, uniform light spots with proper size, high illumination depth (light beam depth) and the like. To meet the above requirements, the light emitting assembly of the operating lamp generally adopts the following two modes: 1. using the principle of refraction of light, such as lenses; 2. the principle of light reflection such as a reflecting cup and a reflecting bowl is utilized.
However, in the conventional lens type, the outgoing light of the light source is refracted through the lens, and the light is incident from the incident end of the lens and is emitted from the outgoing end, but part of the light in the outgoing light of the light source cannot be shaped, and the part of the light is deflected into astigmatism after being refracted through the lens, so that the light energy utilization rate is low.
Disclosure of Invention
The utility model aims to provide an optical lens which is used for shaping emergent light of a light source and can improve the light energy utilization rate. The utility model also provides a lighting device and an operating lamp.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an optical lens for shaping outgoing light of a light source, the optical lens comprising an incident groove, a first optical interface and a second optical interface, the outgoing light of the light source being incident into the optical lens through the incident groove;
the first optical interface is arranged at one end of the optical lens opposite to the incident groove, so that light rays with an angle smaller than or equal to a preset angle in the light rays entering the optical lens are refracted out through the first optical interface and are emitted into a preset illumination area;
the second optical interface is arranged at the side part of the optical lens, so that the light with the angle larger than the preset angle in the light entering the optical lens is incident to the second optical interface, the light is totally reflected at the second optical interface, and the reflected light is further refracted out of the optical lens and is emitted into the preset illumination area.
Optionally, the first optical interface enables light rays with an angle smaller than or equal to the preset angle in the light rays entering the optical lens to be refracted out through the first optical interface, and the emergent light rays are in a converging form or a collimating form.
Optionally, the second optical interface makes the light with an angle greater than the preset angle in the light entering the optical lens totally reflect and reflect out of the optical lens after the second optical interface, and the outgoing light is in a convergent form, a divergent form or a collimation form.
Optionally, the optical lens further includes an exit slot disposed at an end of the optical lens opposite to the entrance slot, and the first optical interface is used as a bottom surface of the exit slot.
Optionally, the optical lens further includes a third optical interface disposed at an end of the optical lens opposite to the incident groove, the second optical interface is connected to the third optical interface away from an end edge of the light source, the exit groove is connected to the third optical interface, and reflected light beams reflected by the second optical interface are refracted out through the third optical interface.
Optionally, the exit slot notch is larger than the cross section of the exit slot bottom.
Optionally, the first optical interface is a hemispherical surface or a semi-ellipsoidal surface, or/and the second optical interface is a curved surface formed by rotating a semiparabolic curve with a central axis.
Optionally, a first protrusion is disposed at an end of the optical lens, which is close to the light source, and the first protrusion is used for being connected with a circuit board on which the light source is mounted, or/and a second protrusion is disposed at an end edge of the optical lens, which is far away from the light source, so that the optical lens is mounted through the second protrusion.
A lighting device comprising a light source and an optical lens, the light source being within an entrance slot of the optical lens, the optical lens being any one of the optical lenses described above.
The operating lamp comprises a plurality of illuminating devices which are sequentially arranged, wherein each illuminating device is symmetrically distributed with the main optical axis of the operating lamp as a center or is symmetrically distributed with any straight line on a plane perpendicular to the main optical axis of the operating lamp as a symmetrical axis.
As can be seen from the above technical solution, the optical lens provided by the present utility model is configured to shape outgoing light from a light source, where the optical lens includes an incident groove, a first optical interface and a second optical interface, outgoing light from the light source enters the optical lens through the incident groove, the first optical interface is disposed at an end of the optical lens opposite to the incident groove, so that light with an angle smaller than or equal to a preset angle in the light entering the optical lens is refracted out through the first optical interface and exits into a preset illumination area; the second optical interface is arranged at the side part of the optical lens, so that the light with the angle larger than the preset angle in the light entering the optical lens is incident to the second optical interface, the light is totally reflected at the second optical interface, and the reflected light is further refracted out of the optical lens and is emitted into the preset illumination area. The optical lens is provided with the first optical interface and the second optical interface, the first optical interface enables the light rays with the angles smaller than or equal to the preset angle in the light rays entering the optical lens to be refracted out and emitted into the preset illumination area, the second optical interface reflects the light rays with the angles larger than the preset angle in the light rays entering the optical lens, and the reflected light rays are further refracted out of the optical lens and emitted into the preset illumination area, so that the two light rays are emitted into the preset illumination area, and astigmatism is avoided.
The lighting device and the operating lamp provided by the utility model can achieve the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a spot formed by light emitted from an optical lens according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram illustrating light propagation of an optical lens according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a lighting device according to an embodiment of the utility model;
fig. 4 is a front view of the illumination device shown in fig. 3, as seen from an entrance slot;
FIG. 5 is a front view of the illumination device shown in FIG. 3 from the exit slot;
fig. 6 is a schematic diagram of an operating lamp according to an embodiment of the utility model.
Reference numerals in the drawings of the specification include:
10-optical lens, 11-light source, 100-lighting device, 101-first optical interface, 102-second optical interface, 103-third optical interface, 104-incident groove, 105-exit groove, 106-first convex part, 107-second convex part, 201-middle part of light spot, 202-outer ring part of light spot.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
The embodiment provides an optical lens for shaping emergent light of a light source, wherein the optical lens comprises an incidence groove, a first optical interface and a second optical interface, and emergent light of the light source enters the optical lens through the incidence groove;
the first optical interface is arranged at one end of the optical lens opposite to the incident groove, so that light rays with an angle smaller than or equal to a preset angle in the light rays entering the optical lens are refracted out through the first optical interface and are emitted into a preset illumination area;
the second optical interface is arranged at the side part of the optical lens, so that the light with the angle larger than the preset angle in the light entering the optical lens is incident to the second optical interface, the light is totally reflected at the second optical interface, and the reflected light is further refracted out of the optical lens and is emitted into the preset illumination area.
The angle of the light rays refers to the angle of the light rays with respect to the main optical axis of the light source. The predetermined illumination area may be considered as an area delimited on the receiving surface, the receiving surface facing the light source.
The emergent light of the light source enters the optical lens through the incident groove, and the light with the angle smaller than or equal to the preset angle among the light entering the optical lens enters the first optical interface, is refracted out through the first optical interface and is emergent to the preset illumination area. And light rays with angles larger than a preset angle in the light rays entering the optical lens are incident to the second optical interface, the light rays are totally reflected at the second optical interface, and the formed reflected light rays are further refracted out of the optical lens and are emitted into a preset illumination area.
The optical lens of the embodiment is provided with the first optical interface and the second optical interface, the first optical interface enables the light with the angle smaller than or equal to the preset angle in the light entering the optical lens to be refracted out and emitted into the preset illumination area, the second optical interface reflects the light with the angle larger than the preset angle in the light entering the optical lens and enables the reflected light to be further refracted out of the optical lens and emitted into the preset illumination area, and therefore both parts of light are emitted into the preset illumination area, astigmatism is avoided, and therefore the optical lens of the embodiment can improve the light energy utilization rate.
The outgoing light of the optical lens shaping light source means that the outgoing light of the light source passes through the optical lens, and the optical lens can adjust the angle of the light, so that the light can irradiate to a preset illumination area after passing through the optical lens. If the light passes through the optical lens and irradiates to the preset illumination area, an illumination spot is formed in the preset illumination area. If the light is emitted outside the preset illumination area, the light becomes astigmatism. After the outgoing light of the light source passes through the optical lens in this embodiment, the outgoing light is divided into two parts, the middle part of the outgoing light beam is formed by a first optical interface where the light passes through the optical lens and is close to the main optical axis, the outer ring part of the outgoing light beam is formed by a second optical interface where the light passes through the optical lens and is further away from the main optical axis, as shown in fig. 1, for example, fig. 1 is a schematic view of a flare formed by the outgoing light of the optical lens, the middle part 201 of the flare is formed by a light ray passing through the first optical interface where the optical lens is close to the main optical axis, and the outer ring part 202 is formed by a light ray passing through the second optical interface where the optical lens is further away from the main optical axis.
The position of the first optical interface relative to the incident groove, the surface shape and the size of the first optical interface, the position of the second optical interface relative to the incident groove, the surface shape and the size of the second optical interface and the shape of the incident groove need to meet the requirements that the light with the angle smaller than or equal to the preset angle in the light entering the optical lens is refracted through the first optical interface and is emitted into the preset illumination area, and the light with the angle larger than the preset angle in the light entering the optical lens is totally reflected at the second optical interface and is emitted into the preset illumination area after the reflected light is refracted out of the optical lens, so that the requirements can be met through optical design in practical application. In this embodiment, the size of the preset angle is not limited, and can be determined correspondingly when the optical lens is optically designed.
In this embodiment, the surface shape of the first optical interface is not limited, and the first optical interface is preferably a curved surface. Optionally, the first optical interface may enable light with an angle smaller than or equal to the preset angle among the light entering the optical lens to be refracted out through the first optical interface, and the emergent light is in a converging form or a collimating form. The first optical interface may be a convex surface protruding toward the light emitting side of the optical lens, so that the light rays are in a converging form or a collimating form after being refracted out through the first optical interface, and the converging form of the light rays emitted from the first optical interface are in a diverging form on a long-distance receiving surface after being transmitted in a long distance. The first optical interface may be, but is not limited to, a hemispherical or semi-ellipsoidal surface.
In this embodiment, the shape of the second optical interface is not limited, and the second optical interface is preferably a curved surface. Optionally, the second optical interface may enable the light with an angle greater than the preset angle in the light entering the optical lens to be totally reflected at the second optical interface and refracted out of the optical lens, and the outgoing light is in a converging form, a diverging form or a collimating form, so that in practical application, the design can be performed according to the shaping requirement of the optical lens on the outgoing light of the light source. The second optical interface may be, but is not limited to, a curved surface formed by a semiparabolic curve rotating about a central axis, and may be a continuous curved surface formed by a semiparabolic curve rotating.
In some embodiments, the optical lens may further include an exit groove disposed at an end of the optical lens opposite to the entrance groove, and the first optical interface may serve as a bottom surface of the exit groove. Referring to fig. 2 for example, fig. 2 is a schematic light propagation diagram of an optical lens according to an embodiment, as shown in the drawing, the optical lens 10 includes an incident groove 104 and an exit groove 105, the first optical interface 101 is a bottom surface of the exit groove 105, and the second optical interface 102 is disposed on a side portion of the optical lens 10. The light enters the optical lens 10 through the incident groove 104, and the light with the angle smaller than or equal to the preset angle among the light entering the optical lens 10 enters the first optical interface 101 and is refracted out through the first optical interface 101. Light rays with angles larger than a preset angle among the light rays entering the optical lens 10 are incident on the second optical interface 102, and the light rays are totally reflected at the second optical interface 102, and the reflected light rays are further refracted out of the optical lens 10.
Preferably, the notch of the exit slot 105 is larger than the cross section of the bottom of the exit slot 105, so that the exit slot 105 is divergent along the direction toward the notch, which is beneficial for the light rays refracted out from the bottom of the exit slot 105 to exit. The central axis of the incident groove 104 coincides with the central axis of the exit groove 105, and the central axes of the incident groove 104 and the exit groove 105 can respectively coincide with the main optical axis of the optical lens 10, so that the optical lens has uniform shaping effect on the light emitted by the light source.
In the present embodiment, the shape of the incident groove 104 is not limited, and the first optical interface 101 and the second optical interface 102 may be combined when the optical lens 10 is optically designed. Alternatively, as shown with reference to fig. 2, the entrance slot 104 may include a bottom surface and a side surface, and the outgoing light of the light source is refracted into the optical lens 10 through the bottom surface or the side surface of the entrance slot 104. In this embodiment, the bottom surface shape and the side surface shape of the incident groove 104 are not limited, and may be designed correspondingly in practical application.
In some embodiments, the optical lens 10 may further include a third optical interface disposed at an end of the optical lens 10 opposite to the incident groove 104, the second optical interface 102 is connected to the third optical interface away from the end edge of the light source, the exit groove 105 is connected to the third optical interface, and the reflected light totally reflected at the second optical interface 102 is refracted through the third optical interface. The light rays with the angle larger than the preset angle in the light rays entering the optical lens 10 are incident to the second optical interface 102, total reflection occurs at the second optical interface 102, and the formed reflected light rays are refracted out of the optical lens 10 through the third optical interface. In the embodiment, the surface shape of the third optical interface is not limited, and the first optical interface 101, the second optical interface 102 and the exit slot 105 can be combined when the optical lens 10 is optically designed in practical application, so as to meet the shaping requirement of the optical lens 10 on the light emitted from the light source. The third optical interface may be planar or curved. Referring to fig. 3, 4 and 5, fig. 3 is a schematic structural view of an illumination device according to an embodiment, fig. 4 is a front view of the illumination device shown in fig. 3 from an incident groove, fig. 5 is a front view of the illumination device shown in fig. 3 from an exit groove, and the illumination devices shown in fig. 3 to 5 employ the optical lens according to the above embodiments. As shown in the figure, the optical lens 10 further includes a third optical interface 103 disposed at an end of the optical lens 10 opposite to the incident groove 104, an end edge of the second optical interface 102 away from the light source 11 is connected to an outer side edge of the third optical interface 103, and the exit groove 105 is connected to an inner side edge of the third optical interface 103. The third optical interface 103 is planar. Wherein the cross section of the entrance slot 104 is circular and the cross section of the exit slot 105 is circular.
Preferably, the optical lens 10 is provided with a first protrusion at one end near the light source 11, the first protrusion being for connection with a circuit board on which the light source 11 is mounted. As shown in fig. 2 to 5, the first protrusion 106 of the optical lens 10 is used as a foot of the optical lens 10, so that the optical lens 10 and a circuit board carrying the light source 11 can be conveniently fixed, and the first protrusion 106 of the optical lens 10 can be clamped in a corresponding hole on the circuit board.
Preferably, a second protrusion is provided at an end edge of the optical lens 10 remote from the light source 11, so that the optical lens 10 is mounted by the second protrusion. As shown in fig. 2 to 5, a second protrusion 107 is provided at an end edge of the optical lens 10 remote from the light source 11, and the optical lens 10 is connected to a lens cover by the second protrusion 107, and the lens cover is fixed to the frame. The lens cover may be fixed to a plurality of optical lenses 10, i.e., a modular design, and the lens cover may be fixed to the frame by screws.
The optical lens of the present embodiment can be adapted to a light source of an arbitrary divergence angle, and can be adapted to a light source 11 of an arbitrary color temperature or an arbitrary luminous flux. The optical lens 10 of this embodiment is provided with a first optical interface 101 and a second optical interface 102, the first optical interface 101 is used to refract the light with an angle smaller than or equal to the preset angle out of the light entering the optical lens 10, and the second optical interface 102 is used to reflect the light with an angle larger than the preset angle out of the light entering the optical lens 10, and further refract the reflected light out of the optical lens 10, and then the reflected light is emitted into the preset illumination area, so that both parts of light are emitted into the preset illumination area, thereby avoiding forming astigmatism. And through the optimal design of the first optical interface 101 and the second optical interface 102, the light rays reflected by the first optical interface 101 and the light rays reflected by the second optical interface 102 are guaranteed to be well converged, the interval between the two parts of light rays is avoided, namely the fault of a facula middle part 201 and an outer ring part 202 formed by emergent light is avoided, and the facula illuminance is guaranteed to be uniform.
The present embodiment also provides an illumination device, including a light source 11 and an optical lens 10, where the light source 11 is located in an incident groove 104 of the optical lens 10, and the optical lens is the optical lens 10 according to any one of the above embodiments.
In the lighting device of the embodiment, the optical lens 10 is provided with the first optical interface 101 and the second optical interface 102, the first optical interface 101 is used to refract the light with the angle smaller than or equal to the preset angle in the light entering the optical lens 10, and the light is emitted into the preset lighting area, and the second optical interface 102 is used to reflect the light with the angle larger than the preset angle in the light entering the optical lens 10, and further refract the reflected light out of the optical lens 10 and emit the reflected light into the preset lighting area, so that both parts of light are emitted into the preset lighting area, and astigmatism is avoided.
In the present embodiment, the type and structure of the light source 11 are not limited, and the light source 11 may be a light source having any divergence angle. The light source 11 preferably emits light at an angle of 120 deg., corresponding to the illumination device shown in fig. 3 to 5, and receives a round and full spot 1m in front of the illumination device. The light source 11 may employ, but is not limited to, an LED.
The embodiment also provides an operating lamp, including a plurality of lighting devices according to any one of the above embodiments, wherein the lighting devices are arranged in sequence, and each lighting device is distributed symmetrically about a main optical axis of the operating lamp or symmetrically about any one straight line on a plane perpendicular to the main optical axis of the operating lamp. The illumination device adopted by the operating lamp can improve the light energy utilization rate.
In this embodiment, the number of the illumination devices included in the operating lamp is not limited. In practical application, the method can be set correspondingly according to application requirements. Referring to fig. 6, fig. 6 is a schematic diagram of an operation lamp according to an embodiment, the operation lamp includes 66 illumination devices 100, the 66 illumination devices 100 are arranged according to an optimal design scheme of shadowless effect, spot size and light beam depth, and all the illumination devices 100 are rotationally symmetrically distributed with a main optical axis of the operation lamp as a center. The operating lamp of this embodiment is the multi-source refraction and reflection type operation shadowless lamp, and its main optical element is a plurality of light sources and optical lens, adopts the refraction and the reflection principle of light for the illumination of operating room, and furthest reduces the work area shadow that causes by the local shielding of operating personnel.
The embodiments of the present utility model have been described above by way of specific examples for illustrative purposes only and are not intended to limit the scope of the present utility model. In the present utility model, unless explicitly specified and limited otherwise, the terms "fixed," "connected," and the like are to be construed broadly, and may be fixed by connection, relatively fixed by line connection, or internally connected, for example, as will be understood by those of ordinary skill in the art in view of the specific meaning of the terms in the present utility model.
The optical lens, the lighting device and the operating lamp provided by the utility model are described in detail. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
Claims (10)
1. An optical lens for shaping outgoing light of a light source, wherein the optical lens comprises an incidence groove, a first optical interface and a second optical interface, and outgoing light of the light source enters the optical lens through the incidence groove;
the first optical interface is arranged at one end of the optical lens opposite to the incident groove, so that light rays with an angle smaller than or equal to a preset angle in the light rays entering the optical lens are refracted out through the first optical interface and are emitted into a preset illumination area;
the second optical interface is arranged at the side part of the optical lens, so that the light with the angle larger than the preset angle in the light entering the optical lens is incident to the second optical interface, the light is totally reflected at the second optical interface, and the reflected light is further refracted out of the optical lens and is emitted into the preset illumination area.
2. The optical lens of claim 1, wherein the first optical interface enables light rays with an angle smaller than or equal to the preset angle to be refracted out through the first optical interface, and outgoing light rays are in a converging form or a collimating form.
3. The optical lens of claim 1, wherein the second optical interface is configured such that, of the light rays entering the optical lens, light rays having an angle greater than the predetermined angle are totally reflected at the second optical interface and refracted out of the optical lens, and the outgoing light rays are in a converging form, a diverging form, or a collimating form.
4. The optical lens of claim 1, further comprising an exit slot disposed at an end of the optical lens opposite the entrance slot, the first optical interface being a bottom surface of the exit slot.
5. The optical lens of claim 4, further comprising a third optical interface disposed at an end of the optical lens opposite the entrance slot, wherein an end edge of the second optical interface remote from the light source is connected to the third optical interface, wherein the exit slot is connected to the third optical interface, and wherein reflected light rays that are totally reflected at the second optical interface are refracted out through the third optical interface.
6. The optical lens of claim 4 wherein the exit slot notch is larger than the cross-section of the exit slot bottom.
7. The optical lens of claim 1, wherein the first optical interface is hemispherical or semi-ellipsoidal, or/and the second optical interface is curved formed by a semiparabolic curve rotating about a central axis.
8. An optical lens according to any one of claims 1 to 7, wherein the optical lens is provided with a first protrusion at an end thereof close to the light source, the first protrusion being for connection with a circuit board on which the light source is mounted, or/and a second protrusion at an end edge thereof remote from the light source, so that the optical lens is mounted by the second protrusion.
9. A lighting device comprising a light source and an optical lens, wherein the light source is positioned in an entrance groove of the optical lens, and the optical lens is the optical lens of any one of claims 1 to 8.
10. An operating lamp, characterized by comprising a plurality of lighting devices according to claim 9 which are arranged in sequence, wherein each lighting device is distributed in a central symmetry manner with a main optical axis of the operating lamp as a center or is distributed in a symmetry manner with any straight line on a plane perpendicular to the main optical axis of the operating lamp as a symmetry axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321572891.9U CN220436321U (en) | 2023-06-20 | 2023-06-20 | Optical lens, lighting device and operating lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321572891.9U CN220436321U (en) | 2023-06-20 | 2023-06-20 | Optical lens, lighting device and operating lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220436321U true CN220436321U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321572891.9U Active CN220436321U (en) | 2023-06-20 | 2023-06-20 | Optical lens, lighting device and operating lamp |
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| Country | Link |
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| CN (1) | CN220436321U (en) |
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2023
- 2023-06-20 CN CN202321572891.9U patent/CN220436321U/en active Active
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