Patent Application
20250164611
The invention relates to a technical field of a laser ranging equipments, and more particularly to a light source structure that is a package structure formed by a light source array including multiple light sources, an optical radar device including the light source structure, and a process of assembling the light source structure.
An optical radar device (also named lidar) involves a technology that uses pulsed laser light to measure the distance of objects. A laser beam is emitted to a target and is reflected by the surface of the target. The reflected laser beam is received so that the distance to the target can be obtained through ranging technology (such as ToF technology or FMCW technology). Optical radar devices are widely used in meteorology, terrain detection, or a ranging application for autonomous vehicle that is currently popular.
Generally, what are used as the light source structure of a known optical radar device are laser diodes. Multiple laser diodes are arranged into an array on a circuit board to emit laser beams at a predetermined frequency for measuring the distance to an object. In such laser light source structure, however, the laser diodes are individually welded to the circuit board. To ensure that the irradiation direction of the beam can meet the requirements, the laser diode array is checked by way of beam projections in the subsequent alignment and correction process. Further, the beam emitted by the laser diode array in a direction parallel to the circuit board additionally requires prisms to change the traveling direction. Therefore, the manufacturing process of known optical radar devices is relatively complex and the beam irradiation direction is easily affected by the manufacturing process. Further, known optical radar devices have a large number of components and are difficult to be miniaturized.
An object of the invention is to provide an optical radar device and its light source structure, which can achieve the required accuracy of the light emission of the light source structure with a relatively simple manufacturing process.
The light source structure in accordance with an exemplary embodiment of the invention includes a light source module, a circuit board, a cover and a beam adjusting module. The light source module includes a substrate and at least one light source element, wherein the substrate includes a bearing surface, the light source element is disposed on the bearing surface and includes a plurality of light emitting units, and each of the light emitting units includes a light emitting portion. The light source module is disposed on the circuit board. The cover is disposed on the circuit board to cover the light source module, wherein the cover is a continuous piece and includes a light permeable portion, and the light emitting portion is disposed to face the light permeable portion. The beam adjusting module is disposed close to the light permeable portion of the cover, wherein light emitted from the light emitting portion passes through the light permeable portion and the beam adjusting module to form a working light beam.
In another exemplary embodiment, the light emitting units are individually controlled to emit the light, the light is emitted by the light emitting portion in a light emitting direction, the bearing surface of the substrate is perpendicular to the circuit board, the light emitting direction is away from and perpendicular to the circuit board, the light permeable portion of the cover is a plane lens, the substrate has electrical insulation and thermal conductivity, and heat generated by the light emitting units during operation is conducted to the substrate to be dissipated.
In yet another exemplary embodiment, the light source module includes a plurality of light source elements arranged into an light source array, each of the light source elements have the same number of light emitting units or a different number of light emitting units, and the light emitting units are semiconductor light emitting units.
In another exemplary embodiment, the light emitting units of each of the light source elements are greater than or equal to two and less than or equal to eight in number, and the light emitting units are laser diode dice or vertical cavity surface emitting laser.
In yet another exemplary embodiment, the light emitting units of each of the light source elements are four in number.
In another exemplary embodiment, the light source array includes a first side, a second side, a third side and a fourth side, the first side is disposed opposite to the fourth side, the second side is disposed opposite to the third side, the first side is disposed next to the second side and the third side. The light source further includes a first electrode layer and a second electrode layer, the first electrode layer and the second electrode layer are disposed on the bearing surface of the substrate, the first electrode and the second electrode layer are electrically connected to the circuit board, the first electrode layer is disposed adjacent to the first side of the light source array, the second electrode layer is disposed adjacent to the second side and the third side of the light source array, and the light emitting portion is disposed adjacent to the four side of the light source array.
In yet another exemplary embodiment, the beam adjusting module includes a fast axis collimator disposed adjacent to the light permeable portion of the cover, and the light emitted from the light emitting portion sequentially passes through the light permeable portion and the fast axis collimator.
In another exemplary embodiment, the beam adjusting module further includes a slow axis collimator integrally formed with the fast axis collimator to be a continuous structure, and the light emitted from the light emitting portion sequentially passes through the light permeable portion, the fast axis collimator and the slow axis collimator.
In yet another exemplary embodiment, the fast axis collimator includes a convex lens portion and a first columnar portion connected to the convex lens portion, the slow axis collimator includes a concave lens portion and a second columnar portion connected to the concave lens portion, the first columnar portion and the second columnar portion are connected, the light sequentially passes through the convex lens portion, the first columnar portion, the second columnar portion, and the concave lens portion, the convex lens portion is configured to deflect the light in a first direction, the concave lens portion is configured to deflect the light in a second direction, and the second direction is perpendicular to the first direction.
In another exemplary embodiment, the beam adjusting module includes a slow axis collimator, the slow axis collimator is disposed to face the light permeable portion of the cover, and the light emitted from the light emitting portion sequentially passes through the light permeable portion and the slow axis collimator.
In yet another exemplary embodiment, the light emitting portion has a horizontal width dx, a vertical width dy, a horizontal lighting angle θx and a vertical lighting angle θy. The horizontal width dx is a measurement parallel to the bearing surface. The vertical width dy is a measurement perpendicular to the bearing surface. The horizontal width dx satisfies 200 μm≤dx≤400 μm. The vertical width dy satisfies 0.5 μm≤dy≤15 μm. The horizontal lighting angle θx satisfies 8°≤θx≤15°. The vertical lighting angle θy satisfies 20°≤θx≤40°. A ratio of the vertical lighting angle θy to the horizontal lighting angle θx satisfies 2≤θy/θx≤4. Two adjacent light emitting portions are spaced at an interval, and has two center points that have a distance therebetween. A ratio of the interval to the distance is ranged from 20% to 40%.
In another exemplary embodiment, the light emitting portion has a horizontal width dx, a vertical width dy, a horizontal lighting angle θx and a vertical lighting angle θy. The horizontal width dx is a measurement parallel to the bearing surface. The vertical width dy is a measurement perpendicular to the bearing surface. The horizontal width dx satisfies 348.25 μm≤dx≤351.75 μm. The vertical width dy satisfies 0.995 μm≤dy≤1.005 μm. The horizontal lighting angle θx satisfies 9.95°≤θx≤10.05°. The vertical lighting angle θy satisfies 320.835°≤θy≤330.165°. Two adjacent light emitting portions are spaced at an interval, and has two center points that have a distance therebetween in a horizontal direction. The distance is greater than or equal to 497.5 μm, and is less than or equal to 502.5 μm. The interval is greater than or equal to 149.25 μm, and less than or equal to 150.75 μm.
The optical radar device in accordance with an exemplary embodiment includes a housing, the above-mentioned light source structure, a scanning element, a light receiving element, and a calculation control unit. The housing includes a transparent window. The light source structure as claimed in claim 1 that is disposed in the housing. The scanning element includes a plurality of reflecting mirrors and being rotatable about an axis. A light receiving element is disposed in the housing to face the window. A calculation control unit is electrically connected to the light source structure, the scanning element and the light receiving element. The working light beam is emitted from the light source structure, the scanning element is rotated so that the working light beam is reflected by one of the reflecting mirrors to an exterior through the window, an emission angle of the working light beam changes with time, the working light beam is reflected by an external object to be received by the light receiving element, and a distance of the external object is calculated by the calculation control unit based on information about emission and reception of the working light beam.
The invention provides an optical radar device and the light source structure thereof, wherein multiple light emitting units are provided to form a light source elements, multiple light source elements are provided to form a light source array, and the light source array is covered by a cover. The light emitting units are individually controlled to emit light. In this way, the accuracy of light beam emission can be increased, and the subsequent adjustment and calibration process of light beam projection can be simplified. The operation of welding laser diodes to the circuit board that is performed in the prior art is not required in the invention. Therefore, the assembly process can be simplified and the required accuracy can be easily reached.
Further, the light emitting direction of the light emitting portion of the light emitting unit is perpendicular to the circuit board. Therefore, no prisms for changing the traveling direction of the light beams are required. The elements of the light source structure can be reduced in number.
Another object of the invention is to provide an assembly process of a light source structure, which can achieve the required accuracy of light emission of the light source structure in a relatively simple process, and is conducive to the miniaturization of optical radar devices.
The assembly process of a light source structure in accordance with an exemplary embodiment of the invention includes steps of providing a substrate that includes a bearing surface; forming at least one light source element on the bearing surface wherein the light source element and the substrate constitute a light source module, the light source element includes a plurality of light emitting units, and each of the light emitting units includes a light emitting portion; providing a circuit board; installing the light source module on the circuit board; providing a cover that is a continuous piece and includes a light permeable portion; placing the cover on the circuit board to form an accommodating space, with the light source module disposed therein and the light emitting portion corresponded to the light permeable portion; forming the accommodating space into a vacuum space; providing a beam adjusting module; and placing the beam adjusting module corresponding to the light permeable portion so that light emitted from the light emitting portion can pass through the beam adjusting module to form a working light beam.
In another exemplary embodiment, the light emitting units are individually controlled to emit the light from the light emitting portion. The light emitting portions emit the light in the same direction. A plurality of light source elements are formed on the bearing surface. The light source elements are arranged into an array. The bearing surface of the substrate is perpendicular to the circuit board.
In yet another exemplary embodiment, the beam adjusting module includes a fast axis collimator and a slow axis collimator integrally formed with the fast axis collimator to be a continuous structure. The fast axis collimator includes a convex lens portion and a first columnar portion connected to the convex lens portion, the slow axis collimator includes a concave lens portion and a second columnar portion connected to the concave lens portion, and the first columnar portion and the second columnar portion are connected to be another continuous structure. The fast axis collimator is disposed adjacent to the light permeable portion of the cover. The first columnar portion is disposed adjacent to the light permeable portion of the cover.
In another exemplary embodiment, the light emitting units are less than or equal to eight in number. The beam adjusting module includes a slow axis collimator. The slow axis collimator is disposed adjacent to the light permeable portion of the cover.
In yet another exemplary embodiment, the light emitting units are four in number.
In another exemplary embodiment, the light emitting portion has a horizontal width dx, a vertical width dy, a horizontal lighting angle θx and a vertical lighting angle θy. The horizontal width dx is a measurement parallel to the bearing surface. The vertical width dy is a measurement perpendicular to the bearing surface. The horizontal width dx satisfies 200 μm≤dx≤400 μm. The vertical width dy satisfies 0.5 μm≤dy≤15 μm. The horizontal lighting angle θx satisfies 8°≤θx≤15°. The vertical lighting angle θy satisfies 20°≤θx≤40°. A ratio of the vertical lighting angle θy to the horizontal lighting angle θx satisfies 2≤θy/θx≤4. Two adjacent light emitting portions are spaced at an interval, and has two center points that have a distance therebetween. A ratio of the interval to the distance is ranged from 20% to 40%.
In yet another exemplary embodiment, the light emitting portion has a horizontal width dx, a vertical width dy, a horizontal lighting angle θx and a vertical lighting angle θy. The horizontal width dx is a measurement parallel to the bearing surface. The vertical width dy is a measurement perpendicular to the bearing surface. The horizontal width dx satisfies 348.25 μm≤dx≤351.75 μm. The vertical width dy satisfies 0.995 μm≤dy≤1.005 μm. The horizontal lighting angle θx satisfies 9.95°≤θx≤10.05°. The vertical lighting angle θy satisfies 32.835°≤θy≤33.165°. Two adjacent light emitting portions are spaced at an interval, and has two center points that have a distance therebetween in a horizontal direction. The distance is greater than or equal to 497.5 m, and is less than or equal to 502.5 μm. The interval is greater than or equal to 149.25 μm, and less than or equal to 150.75 μm.
The invention provides an assembly process of a light source structure, wherein multiple light emitting units are provided to form a light source elements, multiple light source elements are provided to form a light source array, and the light source array is covered by a cover. The light emitting units are individually controlled to emit light. In this way, the accuracy of light beam emission can be increased, and the subsequent adjustment and calibration process of light beam projection can be simplified. The operation of welding laser diodes to the circuit board that is performed in the prior art is not required in the invention. Therefore, the assembly process can be simplified and the required accuracy can be easily reached.
Further, the light emitting direction of the light emitting portion of the light emitting unit is perpendicular to the circuit board. Therefore, no prisms for changing the traveling direction of the light beams are required. The elements of the light source structure can be reduced in number.
The fast axis collimator and the slow axis collimator of the beam adjusting module are integrally formed into a continuous structure, which can achieve the required accuracy of light emission of the light source structure in a relatively simple process, reduce the number of elements of the light source structure, and is conducive to the miniaturization of optical radar devices. The operation of individually placing the fast axis collimator and the slow axis collimator and the subsequent adjustment and calibration of the fast axis collimator and the slow axis collimator that are performed in the prior art is not required in the invention.
Referring to
As shown in
The light source elements 12 are arranged into a light source array. Each light source element 12 has a plurality of light emitting units 121 as shown in
Referring to
Each light emitting unit 121 has a P-type semiconductor, an N-type semiconductor, and a light-emitting layer (active layer) disposed between the P-type semiconductor and the N-type semiconductor. The N-type semiconductor is electrically connected to the first electrode layer 13. The P-type semiconductor is electrically connected to the second electrode layer 14. The light emitting layer has a light emitting portion 1211 formed at the fourth side A4 of the light source array A. All the light emitting portions 1211 of the light emitting units 121 are configured to emit light in a light emitting direction L. The light generated by the electrons and electron holes in the light emitting layer is emitted from the light emitting portion 1211 in the light emitting direction L. The N-type semiconductor of each light emitting unit 121 is connected to the first electrode layer 13 with two pins. One pin is configured to provide an electric current, and the other pin is configured to control whether the light emitting layer lights up, so that the light emitting units 121 can be individually controlled to emit light.
Referring to
A cover 30 is disposed on the circuit board 20 to cover the light source module 10. In this embodiment, the cover 30 has a light permeable portion 31 and side walls 32 configured to surround the light source module 10. The light permeable portion 31 is disposed at an end of the side walls and corresponded to the light emitting portion 1211 of the light emitting unit 121 of the light source module 10. The light emitting direction L of the light emitting portion 1211 of the light emitting unit 121 extends through the light permeable portion 31. In this embodiment, the light permeable portion 31 is a plane lens. For example, the light permeable portion 31 is a double-sided coated plane lens to avoid light reflection.
As shown in
In this embodiment, the fast axis collimator 41 includes a columnar convex lens. The columnar convex lens may have an aspheric surface (such as paraboloidal surface). The slow axis collimator 42 includes a columnar concave lens. The columnar concave lens has a microstructure formed by an array of concave lenses with multiple aspheric surfaces (such as paraboloidal surfaces). In some other embodiments, the fast axis collimator 41 may be a spherical convex lens, and the slow axis collimator 42 may be a spherical concave lens.
In this embodiment, the fast axis collimator 41 and the slow axis collimator 42 are combined in such a way that the beam adjusting module 40 is formed into a continuous structure, wherein the fast axis collimator 41 includes a convex lens portion 411 and a first columnar portion 412, and the slow axis collimator 42 includes a concave lens portion 421 and a second columnar portion 422. The concave lens portion 421 has a microstructure provided with multiple concave lenses. The convex lens portion 411 and the concave lens portion 421 are disposed at two opposite ends of the beam adjusting module 40 that has a continuous structure. The first columnar portion 412 and the second columnar portion 422 are connected to each other. The convex lens portion 411 of the fast axis collimator 41 is disposed to face the light permeable portion 31. The light emitted from the light source module 10 passes through the light permeable portion 31 and the convex lens portion 411 of the fast axis collimator 41. Before diverging, the light is converged by the convex lens part 411 in the fast axis direction (first direction L1). Then, the light passes through the first columnar portion 412 and the second columnar portion 422, both of which have no refractive power, and passes through the concave lens portion 421. The concave lens portion 421 causes an appropriate degree of divergence of light in the second direction L2. The second direction L2 is perpendicular to the first direction L1.
Referring to
The scanning element 3 includes multiple reflecting mirrors 3A that are connected to form a columnar structure. The scanning element 3 is rotatable about an axis. The light source structure 1 is able to emit a working light beam at a predetermined frequency. The scanning element 3 rotates so that one of the reflecting mirrors 3A reflects the working light beam to the outside through the window 2A, and the emission angle of the working light beam changes with time, whereby a scan is performed within a certain angle range relative to the horizontal direction (X-axis) of the optical radar device. Since the concave lens portion 421 of the beam adjusting module 40 causes the light to diverge to an appropriate degree in the second direction L2, the divergence angle may be, but is not limited to, 32 degrees or 60 degrees. The second direction L2 is parallel to the perpendicular direction (Y-axis) of the optical radar device. In this way, when the scanning element 3 rotates, light can scan the external space in the X-axis and Y-axis directions. Since the working light beam travels along the Z-axis, a three-dimensional scanning effect can be produced. As described, multiple reflecting mirrors 3A are connected to each other to form a columnar structure. Therefore, when the scanning element 3 rotates about the axis, the reflection of the working light beam by the reflecting mirror 3A is periodical to form a loop, so that the scan of the working light beam can be periodically performed within a certain angular range.
The light receiving element 4 is disposed in the housing to face the transparent window 2A. Therefore, the working light beam reflected by an external object can be received by the light receiving element 4. The calculation control unit is electrically connected to the light source structure 1, the scanning element 3 and the light receiving element 4. The distance to the external object can be calculated by the calculation control unit based on the information about emission and reception of the working light beam.
The invention provides an optical radar device and the light source structure thereof, wherein multiple light emitting units are provided to form a light source elements, multiple light source elements are provided to form a light source array, and the light source array is covered by a cover. The light emitting units are individually controlled to emit light. In this way, the accuracy of light beam emission can be increased, and the subsequent adjustment and calibration process of light beam projection can be simplified. The operation of welding laser diodes to the circuit board that is performed in the prior art is not required in the invention. Therefore, the assembly process can be simplified and the required accuracy can be easily reached.
Further, the light emitting direction of the light emitting portion of the light emitting unit is perpendicular to the circuit board. The slow axis collimator of the beam adjusting module deflects the light on the Y-axis, and the scanning element deflects the light on the X-axis. Therefore, no prisms for changing the traveling direction of the light beams are required. The elements of the light source structure can be reduced in number.
Step S1 is a step for providing a substrate 11 that has a bearing surface 111 as shown in
The process goes to step S2. Step S2 is a step of forming a light source module. In the step S2, at least one light source element 12 is formed on the bearing surface 111. The light source element 12 and the substrate 11 constitute a light source module 10. Each light source element 12 has a plurality of light emitting units 121. Each light emitting unit 121 has a light emitting portion 1211. In this embodiment, each light emitting portion 1211 has a horizontal width dx, a vertical width dy, a horizontal lighting angle θx and a vertical lighting angle θy. The horizontal width dx is a measurement parallel to the bearing surface. The vertical width dy is a measurement perpendicular to the bearing surface. The range of the horizontal width dx is 200 μm≤dx≤400 μm. A preferred horizontal width dx is 350 μm. Under the condition that the measurement tolerance is ±0.5%, a preferred range of the horizontal width dx is 348.25 μm≤dx≤351.75 μm. The range of the vertical width dy is 0.5 μm≤dy≤15 μm. A preferred vertical width dy is 1 μm. Under the condition that the measurement tolerance is ±0.5%, a preferred range of the vertical width dy is 0.995 μm≤dy≤1.005 μm. The range of the horizontal lighting angle θx is 8°≤θx≤15°. A preferred horizontal lighting angle θx is 10°. Under the condition that the measurement tolerance is ±0.5%, a preferred range of the horizontal lighting angle θx is 9.95°≤θx≤10.05°. The range of the vertical lighting angle θy is 20°≤θx≤40°. A preferred vertical lighting angle θy is 33°. Under the condition that the measurement tolerance is ±0.5%, a preferred range of the vertical lighting angle θy is 32.835°≤θy≤33.165°.
The process goes to step S3. In order to enable the light source element 12 to operate, the light source module 10 further includes a first electrode layer 13 and a second electrode layer 14. The step of forming the light source module further includes forming the first electrode layer 13 and the second electrode layer 14 on the bearing surface 111 of the substrate 11 by, for example, chemical vapor deposition (CVD).
The step of forming a light source module (step S2) further includes forming multiple light source elements 12 on the bearing surface 111 and arranging the light source elements 12 into an array A. Each light source element 12 includes a plurality of light emitting units 121 shown in
As shown in
Each light emitting unit 121 has a P-type semiconductor, an N-type semiconductor, and a light-emitting layer (active layer) disposed between the P-type semiconductor and the N-type semiconductor. The N-type semiconductor is electrically connected to the first electrode layer 13. The P-type semiconductor is electrically connected to the second electrode layer 14. The light emitting layer has a light emitting portion 1211 formed at the fourth side A4 of the light source array A.
The step of forming the light source module (step S2) further includes configuring all the light emitting portions of the light emitting units 121 to emit light in a light emitting direction L. Therefore, light generated by the electrons and electron holes in the light emitting layer is emitted from the light emitting portion 1211 in the light emitting direction L.
The step of forming the light source module (step S2) further includes configuring the light emitting units 121 in such a way that the light emitting units 121 are individually controlled to emit light. The N-type semiconductor of each light emitting unit 121 is connected to the first electrode layer 13 with two pins. One pin is configured to provide an electric current, and the other pin is configured to control whether the light emitting layer lights up, so that the light emitting units 121 can be individually controlled to emit light.
Step S3 is a step for providing a circuit board 20 that may be a rigid circuit board made of epoxy resin and glass fiber or a flexible circuit board made of Polyimide (PI).
The process goes to step S4. Step S4 is a step of installing the light source module. In step S4, the light source module 10 is disposed on the circuit board 20. The first electrode layer 13 and the second electrode layer 14 of the light source module 10 are electrically connected to the circuits of the circuit board 20. By such arrangement, the circuits of the circuit board 20 can provide electric currents for the light source module 10 and control the light source module 10 to emit light. The bearing surface 111 of the substrate 11 of the light source module 10 is perpendicular to the circuit board 20. The first side A1 of the light source array A is disposed close to the circuit board 20. The fourth side A4 of the light source array A is disposed distant from the circuit board 20. By such arrangement, the light emitting direction L of the light emitting portion 1211 of the light emitting unit 121 is perpendicular to the circuit board 20 without requiring any prisms to change the light path.
The process goes to step S5. Step S5 is a step of providing the cover 30. In step S5, a cover 30 having a light permeable portion 31 is provided. In this embodiment, the cover 30 has a light permeable portion 31 and side walls 32. In this embodiment, the light permeable portion 31 is a plane lens. For example, the light permeable portion 31 is a double-sided coated plane lens to avoid light reflection.
The process goes to step S6. Step S6 is a step of installing the cover 30. In step S6, the cover 30 is disposed on the circuit board 20 to form an accommodating space S, with the light source module 10 disposed therein and the light emitting portion 1211 of the light emitting unit 121 of the light source module 10 corresponded to the light permeable portion 31. The light source module 10 is surrounded by the side walls 32 of the cover 30. The light permeable portion 31 is disposed at an end of the side walls 32 and corresponded to the light emitting portion 1211 of the light emitting unit 121 of the light source module 10. The light emitting direction L of the light emitting portion 1211 of the light emitting unit 121 extends through the light permeable portion 31. The accommodating space S is formed into a vacuum space.
The process goes to step S7. Step S7 is a step of proving a beam adjusting module. In step S7, the beam adjusting module 40 is provided.
The process goes to step S8. Step S8 is a step of installing a beam adjusting module. In step S8, the beam adjusting module 40 is disposed corresponding to the light permeable portion 31 of the cover 30, so that the light emitted by the light emitting portion 1211 of the light emitting unit 121 can pass through the beam adjusting module 40 to form a working light beam. The step of installing the beam adjusting module includes placing the fast axis collimator 41 close to the light permeable portion 31 of the cover 30. Specifically, the first columnar portion 412 of the fast axis collimator 41 is placed close to the light permeable portion 31 of the cover 30.
The invention provides a process of assembling a light source structure, wherein multiple light emitting units are provided to form a light source elements, multiple light source elements are provided to form a light source array, and the light source array is covered by a cover. The light emitting units are individually controlled to emit light. In this way, the accuracy of light beam emission can be increased, and the subsequent adjustment and calibration process of light beam projection can be simplified. Further, the operation of welding laser diodes to the circuit board that is performed in the prior art is not required in the invention. Therefore, the assembly process can be simplified and the required accuracy can be easily reached.
Further, the light emitting direction of the light emitting portion of the light emitting unit is perpendicular to the circuit board. No prisms for changing the traveling direction of the light beams are required. Therefore, the elements of the light source structure can be reduced in number.
The slow axis collimator and the fast axis collimator are integrally formed as a continuous piece. In this way, there is no need to separately install the fast axis collimator and the slow axis collimator that is performed in the prior art and that requires the subsequent adjustment and calibration process when the fast axis collimator and the slow axis collimator are installed.
What are described above are only the preferred embodiments of the invention, and the scope of the invention is not limited thereto. That is, the simple equivalent changes and modifications made according to the description of the invention and the claims are all within the scope of the invention. Further, any one of the embodiments or claims is not required to achieve all the objects or advantages or features of the invention. Further, the abstract and title are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. Further, the terms “first” and “second” described in the specification and claims are only used to distinguish between different elements, embodiments or scopes, without limiting the quantity of the elements with an upper limit or a lower limit.
| Number | Date | Country | Kind |
|---|---|---|---|
| 112144758 | Nov 2023 | TW | national |
| 113111477 | Mar 2024 | TW | national |
