Spherical lens assembly and miniature optical scanning system thereof

Abstract

The utility model relates to a spherical lens assembly and a miniature optical scanning system thereof, and the spherical lens assembly is sequentially provided with a first lens, a second lens and a third lens along the propagation direction of a laser beam. The three lenses are spherical lenses, and spacer rings are arranged among the three spherical lenses; and the three spherical lenses are fixedly connected with the two spacer rings. The miniature optical scanning system is sequentially provided with a semiconductor laser, a fast and slow axis collimating lens, a reflector and red light indicator assembly, a galvanometer reflector and the spherical mirror assembly. According to the spherical lens assembly, the spacer ring design is ingeniously adopted, the relative working distance and precision of the three spherical lenses are guaranteed, the interior of the spacer ring is designed in a step-shaped extinction mode, stray light can be effectively eliminated, and therefore output precision is guaranteed; the miniature optical scanning system is simple in overall structure, ingenious in design and simple in manufacturing process, so that the processing cost is low, and the miniature optical scanning system can be better applied to household and medical miniature handheld products.

Description

Technical Field

[0001] The utility model relates to a micro optical scanning system applied in a laser beauty instrument, especially a spherical lens assembly adopted therein, belonging to the field of laser medical beauty. Background Art

[0002] In the field of laser medical beauty, YAG or carbon dioxide lasers and their optical field lens systems are mostly used, with relatively large external dimensions and high costs. Most products in the field of home medical beauty are handheld products, which need to be made in handheld sizes.

[0003] To improve the use effect of handheld laser beauty instrument products, it is necessary to shape the light beam emitted by a semiconductor laser to form a laser spot with stronger energy and certain beauty effects; in particular, it is also necessary to combine a galvanometer mirror device to make the spot perform a scanning motion, so as to produce a better beauty effect.

[0004] The laser scanning system for a laser beauty instrument with the Chinese patent publication number CN118178879A proposed by the applicant is to set a galvanometer swing device on the optical path of the laser. The laser beam is reflected by the mirror of the galvanometer motor. After one reflection, a linearly vibrating laser scan is formed. After two reflections, a two-dimensional vibrating laser scan is formed. Finally, after beam shaping and focusing, it passes through the window glass and shoots out, forming a focused working point outside the window glass for skin beauty.

[0005] However, at the end, a focusing and shaping lens group is needed to shape and focus the light beam, and then it can be focused into a treatment spot with higher energy. The spacing requirements of the focusing and shaping lens group are very high, and only with good precision control can a better focusing effect be achieved, otherwise the final spot energy will be affected.

[0006] In the existing handheld laser beauty instruments, generally, the positions of the lenses in the focusing and shaping lens group are controlled through the slot design on the shell; there are always some gaps in the slots for the convenience of lens installation; and affected by the curvature of the lenses themselves, the spacing between the lenses needs to be adjusted. However, the slots on the shell are injection-molded by a mold and cannot be adjusted. Therefore, in the existing design, the focused spot energies of the focusing and shaping lens group are inconsistent, and later, the emission power of the laser needs to be adjusted through a control module to meet the design requirements.

[0007] In view of the above situation, it is necessary to improve the focusing and shaping lens group, so as to make the shaping effect of the laser beam more consistent. Summary of the Utility Model

[0008] The object of the present utility model is to provide a spherical lens assembly and a micro-optical scanning system thereof, by adding spacer rings in the focusing and shaping lens group composed of spherical lenses, thereby ensuring the relative working distance and accuracy between the lenses, guaranteeing the accuracy of the output, and enabling ultra-short distance focusing, which can be well applied to various low-power semiconductor laser light sources, so as to obtain a hand-held laser beauty instrument product with a more compact internal structure.

[0009] To achieve the above object of the utility model, in a first aspect of the present utility model, there is provided a spherical lens assembly, which successively includes a first lens, a second lens, and a third lens along the propagation direction of the laser beam; the three lenses are spherical lenses, and spacer rings are arranged between the three spherical lenses;

[0010] A first spacer ring is arranged between the first lens and the second lens, and a second spacer ring is arranged between the second lens and the third lens;

[0011] The three spherical lenses and the two spacer rings are fixedly connected.

[0012] As a further improvement of the present utility model, the first lens is a convex lens, the second lens is a convex lens, and the third lens is a concave lens;

[0013] The distance between the first lens and the second lens is less than the distance between the second lens and the third lens;

[0014] The thickness of the first spacer ring is thinner than the thickness of the second spacer ring.

[0015] Furthermore, an extinction step is arranged inside the spacer ring;

[0016] The inner wall of the spacer ring forms a stepped inner wall with a continuously decreasing diameter along the propagation direction of the laser beam;

[0017] The extinction step is a stepped transition between the laser beam incident side and the laser beam exit side inside the spacer ring;

[0018] The inner diameter size of the spacer ring on the laser beam incident side is larger than the inner diameter size of the spacer ring on the laser beam exit side.

[0019] Even further, 1 to 2 extinction steps are arranged inside the first spacer ring.

[0020] Even further, more than 5 extinction steps are arranged inside the second spacer ring.

[0021] As a further improvement of the present utility model, a window sheet is arranged on the side where the laser beam exits the spherical lens assembly;

[0022] The window sheet is a planar light-transmitting sheet.

[0023] In the second aspect of the present utility model, a micro-optical scanning system is provided, which successively includes a semiconductor laser, a fast and slow axis collimating lens, a mirror and a red light indicator assembly, a galvanometer mirror, and the spherical lens assembly as described above;

[0024] A fast and slow axis collimating lens is provided in the laser emission direction of the semiconductor laser, and the fast and slow axis collimating lens is a fast axis collimating lens and / or a slow axis collimating lens;

[0025] A mirror and a red light indicator assembly are provided behind the fast and slow axis collimating lens. The mirror and the red light indicator assembly include a mirror and a red light indicator; the mirror is a transmissive mirror, and the red light indicator is located at the rear side of the mirror;

[0026] A galvanometer mirror is provided behind the fast and slow axis collimating lens. The galvanometer mirror is an X-axis galvanometer mirror and / or a Y-axis galvanometer mirror; the galvanometer mirror includes a galvanometer motor and a mirror;

[0027] The spherical lens assembly as described above is provided behind the galvanometer mirror.

[0028] As a further improvement of the present utility model, the length dimension after the components of the micro-optical scanning system are combined is less than 80 mm.

[0029] As a further improvement of the present utility model, the laser spot size emitted by the micro-optical scanning system is less than 500 μm, and the laser spot is focused at a depth of 300 - 1000 μm under the skin.

[0030] As a further improvement of the present utility model, the galvanometer mirror is an X-axis galvanometer mirror and a Y-axis galvanometer mirror;

[0031] The laser spot emitted by the micro-optical scanning system performs a two-dimensional scanning motion;

[0032] The scanning size of the laser spot is 35×35 mm.

[0033] For the spherical lens assembly and the micro-optical scanning system of the present utility model, the spherical lens assembly ingeniously adopts a spacer ring design to ensure the relative working distance and accuracy of the three spherical lenses, and a stepped extinction design is made inside the spacer ring, which can effectively eliminate stray light, thereby ensuring the accuracy of the output. The overall structure of the micro-optical scanning system is simple, the design is ingenious, and the manufacturing process is simple, so the processing cost is low. It can be well applied to various low-power semiconductor laser light sources and is better applied to household and medical miniaturized handheld products. Brief Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the overall structure of the micro-optical scanning system of the present utility model Figure 1 ;

[0035] Figure 2Schematic diagram of the overall structure of the micro-optical scanning system of the present utility model Figure 2 ;

[0036] Figure 3 Schematic diagram of the overall structure of the spherical lens assembly;

[0037] Figure 4 Exploded view of the components of the spherical lens assembly;

[0038] Figure 5 Schematic diagram of the internal structure of the spherical lens assembly;

[0039] Figure 6 Cross-sectional view of the spherical lens assembly;

[0040] Figure 7 Schematic diagram of optical path shaping and scanning. Specific embodiments

[0041] The following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings.

[0042] The overall structure of the micro-optical scanning system in the handheld laser beauty device is as shown in Figure 1 、 Figure 2 , and includes a semiconductor laser 11, fast and slow axis collimating lenses (12, 13), a mirror and a red light indicator (14), galvanometric mirrors (15, 16), and a spherical lens assembly 2.

[0043] The semiconductor laser 11 emits a laser beam, which is a scattered light beam. After passing through the fast axis collimating lens 12 (fast axis collimator, FAC) and the slow axis collimating lens 13 (slow axis collimator, SAC), the laser beam is shaped, that is, the optical collimation process, so as to form a laser beam propagating in parallel and shoot towards the mirror and red light indicator assembly 14. The mirror deflects the parallel laser beam, and at the same time, the red light emitted by the red light indicator is added to it to form a laser beam with red light indication.

[0044] The red light laser beam deflected by the mirror and red light indicator assembly 14 shoots towards the galvanometric mirrors (15, 16), that is, the X-axis galvanometric mirror 15 and the Y-axis galvanometric mirror 16, so that the red light laser beam can obtain polarization movement in the X-axis and Y-axis directions and form a two-dimensional scanning movement.

[0045] Finally, the red light laser beam shoots through the spherical lens assembly 2, and the spherical lens assembly 2 shapes and focuses the parallel laser beam, so as to form a focused spot on the focal plane and obtain a laser spot sufficient to achieve beauty treatment.

[0046] The focus of the present utility model is to improve the structure of the spherical lens assembly 2, as detailed in Figure 3 、Figure 4 , Figure 5 , Figure 6 。

[0047] The spherical lens assembly 2 is successively provided with a first lens 21, a second lens 22, and a third lens 23 along the propagation direction of the laser beam. Through the three lenses, the parallel laser beam is continuously focused, and finally a spot with a size within 500 μm can be obtained. The smaller the spot size, the greater the energy concentrated by the spot.

[0048] To achieve effective focusing of the parallel laser beam, spacer rings are arranged between the three lenses to ensure the relative working distance and accuracy between the three lenses; a first spacer ring 25 is arranged between the first lens 21 and the second lens 22, and a second spacer ring 26 is arranged between the second lens 22 and the third lens 23.

[0049] Among them, the first lens 21 and the second lens 22 are convex lenses, and the distance between them is relatively small, so the first spacer ring 25 between them is relatively thin, and the parallel laser beam is initially focused inwards.

[0050] The third lens 23 is a concave lens; the distance between the second lens 22 and the third lens 23 is relatively large, so that the laser beam can be focused inwards into the mirror surface of the concave lens, and then further focused into the final spot; therefore, the second spacer ring 26 between them is relatively thick.

[0051] The three lenses and the two spacer rings are fixedly connected to form the spherical lens assembly 2 of the present invention.

[0052] Furthermore, within the spacer rings, especially within the relatively thick second spacer ring 26, there are extinction steps 27; within the relatively thin first spacer ring 25, 1 to 2 extinction steps 27 can be arranged, and within the relatively thick second spacer ring 26, more extinction steps 27 can be arranged. In this embodiment, there are 7 extinction steps 27; the extinction steps 27 are stepped transitions with a larger diameter on the laser beam incident side and a smaller diameter on the laser beam exit side, so that along the focusing size of the laser beam, the inner diameter of the spacer ring continuously decreases, and the inner diameter of the spacer ring is always greater than the scanning range size of the laser beam available to the main body, that is, it has no influence on the transmission of the laser beam available to the main body, but the extinction steps 27 can eliminate stray light, thus ensuring the accuracy of the output.

[0053] Preferably, a window plate 24 is further provided on the side where the laser beam exits the spherical lens assembly 2 to protect the outer surface of the spherical lens assembly 2, especially the third lens 23.

[0054] The spherical lens assembly 2 adopts an overall design, with smaller and more precise dimensions. As a result, the length dimension of the entire micro-optical scanning system can be controlled within 80 mm. Moreover, the spherical lens assembly 2 uses three spherical mirrors for focusing, enabling ultra-short distance focusing. Thus, each deflected laser beam can be precisely focused at a depth of 300 - 1000 um under the skin. In combination with the laser beams directed at the galvanometric mirrors (15, 16), the scanning size of the laser spot can be controlled to 35 × 35 mm, providing a relatively large working area, which is more suitable for use in household and medical miniaturized handheld products, especially convenient for use as the laser system of a handheld laser beauty device.

[0055] The preferred embodiments of the present invention have been specifically described above. However, the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A spherical mirror assembly, characterized in that: A first lens, a second lens, and a third lens are sequentially arranged along the propagation direction of the laser beam; the three lenses are spherical lenses, and a spacer ring is arranged between the three spherical lenses; A first spacer ring is provided between the first lens and the second lens, and a second spacer ring is provided between the second lens and the third lens; The three ball lenses are fixedly connected to the two spacer rings.

2. The spherical mirror assembly according to claim 1, characterized in that: The first lens is a convex lens, the second lens is a convex lens, and the third lens is a concave lens; The distance between the first lens and the second lens is smaller than the distance between the second lens and the third lens; The thickness of the first spacer ring is thinner than the thickness of the second spacer ring.

3. The spherical mirror assembly according to claim 1 or 2, characterized in that: A matte step is provided inside the spacer ring; A step-shaped inner wall with a decreasing diameter is formed inside the spacer ring along the transmission direction of the laser beam; The extinction step is a step-like transition between the laser beam entrance side and the laser exit side in the spacing ring; The inner diameter of the spacer ring on the laser beam entrance side is larger than the inner diameter of the spacer ring on the laser beam exit side.

4. The spherical mirror assembly according to claim 3, characterized in that: One to two extinction steps are arranged in the first spacer ring.

5. The spherical mirror assembly according to claim 3, characterized in that: More than five extinction steps are arranged in the second spacer ring.

6. The spherical mirror assembly according to claim 1, characterized in that: A window piece is provided on one side of the spherical mirror assembly where the laser beam exits; The window piece is a flat light-transmitting piece.

7. A micro optical scanning system, characterized in that: A semiconductor laser, a fast and slow axis collimating lens, a reflector and a red light indicator assembly, a galvanometer reflector, and a spherical mirror assembly as claimed in any one of claims 1 to 6 are sequentially provided; A fast-axis and slow-axis collimating lens is provided in the laser emission direction of the semiconductor laser, and the fast-axis and slow-axis collimating lens is a fast-axis collimating lens and / or a slow-axis collimating lens; A reflector and a red light indicator assembly are arranged behind the fast and slow axis collimating lens, and the reflector and the red light indicator assembly comprises a reflector and a red light indicator; the reflector is a transmissive reflector, and the red light indicator is located at the rear side of the reflector; A galvanometer reflector is arranged behind the fast and slow axis collimating lens, and the galvanometer reflector is an X-axis galvanometer reflector and / or a Y-axis galvanometer reflector; the galvanometer reflector includes a galvanometer motor and a reflector; A spherical mirror assembly as described in any one of claims 1 to 6 is arranged behind the galvanometer reflector.

8. The micro optical scanning system according to claim 7, characterized in that: The length dimension of the micro optical scanning system after all the components are assembled is less than 80mm.

9. The micro optical scanning system according to claim 7, characterized in that: The laser spot size emitted by the micro-optical scanning system is less than 500μm, and the laser spot is focused at 300 to 1000um under the skin.

10. The micro optical scanning system according to claim 7 or 9, characterized in that: The galvanometer reflectors are an X-axis galvanometer reflector and a Y-axis galvanometer reflector; The laser spot emitted by the micro-optical scanning system performs two-dimensional scanning motion; The scanning size of the laser spot is 35×35 mm.

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