阅读说明：本技术 一种头部光医疗装置 (Head light medical treatment device ) 是由 崔英杰 郭立雪 朱映光 张国辉 胡永岚 赵杨 李栋栋 于 2021-09-02 设计创作，主要内容包括：本申请提供一种头部光医疗装置,包括：本体,安装在本体上的若干个梳齿,设置于梳齿内且可伸入或伸出梳齿端部的伸缩结构,以及安装在伸缩结构上且用于提供治疗用照射光的光源；伸缩结构伸出梳齿端部时,伸缩结构底部展开,以扩大光源的照射区域。本申请提供的一种头部光医疗装置,扩大了所述光源的照射区域,增加了光医疗面积,提高了治疗效率；避免了毛发的干扰,使光源可深入至头皮表面,提高了治疗效果。(The present application provides a head photomedical device comprising: the device comprises a body, a plurality of comb teeth arranged on the body, a telescopic structure which is arranged in the comb teeth and can extend into or out of the end parts of the comb teeth, and a light source which is arranged on the telescopic structure and is used for providing irradiation light for treatment; when the telescopic structure extends out of the end part of the comb teeth, the bottom of the telescopic structure is unfolded to enlarge the irradiation area of the light source. According to the head light medical treatment device, the irradiation area of the light source is enlarged, the light medical treatment area is increased, and the treatment efficiency is improved; avoids the interference of hair, leads the light source to be deep on the surface of the scalp and improves the treatment effect.)

1. A head photomedical device, comprising: the method comprises the following steps:

a body (1);

the comb teeth (3) are arranged on the body (1);

the telescopic structure (4) is arranged in the comb teeth (3) and can extend into or out of the end parts of the comb teeth (3);

a light source (2) mounted on the telescopic structure for providing therapeutic illumination light;

when the telescopic structure (4) extends out of the end part of the comb teeth (3), the bottom of the telescopic structure is unfolded to enlarge the irradiation area of the light source (2).

2. A head photomedical device as in claim 1, wherein: the telescopic structure (4) is an umbrella-shaped structure, the umbrella-shaped structure comprises a plurality of umbrella supporting units (5) with mutually fixed tops and mutually separated bottoms, or the telescopic structure (4) is a flexible horn structure.

3. A head photomedical device as in claim 1, wherein: a sliding sleeve (6) is arranged in the comb teeth (3), and the telescopic structure (4) is arranged in the sliding sleeve (6); the sliding sleeve (6) is of a cylindrical structure, and the inner diameter of the top of the cylindrical structure is gradually increased to the bottom of the cylindrical structure.

4. A head photomedical device as in claim 1, wherein: the light source (2) is installed telescopic structure (4) top, the light that light source (2) sent is followed telescopic structure (4) are penetrated into to irradiation area.

5. A head photomedical device as in claim 1, wherein: a scattering structure (7) and/or LED lamp beads are arranged at the bottom of the telescopic structure (4); the bottom of the telescopic structure (4) is provided with a spherical brush head (8), and the scattering structure (7) and/or the LED lamp beads are arranged in the spherical brush head (8).

6. A head photomedical device as in claim 1, wherein: the comb is characterized in that a driving mechanism used for driving the telescopic structure (4) to stretch into or stretch out of the end part of the comb teeth (3) is installed in the body (1).

7. The cranial photomedical device of any one of claims 1-6, wherein: the body (1) is of a scalp brush structure and is provided with an installation body (9) and a handheld part which are integrally connected, and the comb teeth (3) are fixed on the surface of the installation body (9).

8. The cranial photomedical device of claim 7, wherein: the hand-held part is a handle (10) extending from one side or the top of the mounting body (9).

9. The cranial photomedical device of any one of claims 1-6, wherein: the body (1) is in a hair hoop shape, and the comb teeth (3) are arranged on the inner surface of the body.

10. The cranial photomedical device of any one of claims 1-6, wherein: the body (1) is of a ring structure, and the comb teeth (3) are radially arranged on the inner wall of the body; the body (1) is made of flexible materials, and an adjusting belt (11) used for adjusting the radial size of the body (1) is arranged in the body (1).

Technical Field

The present disclosure relates generally to the field of photomedical technology, and in particular, to a head photomedical device.

Background

The metabolism cycle of human skin cells is 28 days, while the metabolism of scalp cells is only 14-21 days, the faster the metabolism speed, the faster the aging; during this period, if the scalp is deficient in water, clogged in hair follicles, or inflamed, microcirculation is not smooth, keratinized proteins are produced, and acne, pimple, etc. are generated on the surface of the scalp.

Acne can be treated by blue light irradiation, which is visible light with the wavelength of 415nm, and the blue light mainly plays a role in exciting porphyrin metabolized in the acne, so that the pH value in bacteria is changed, acne bacilli are killed, the self-repairing capability of skin is further activated, and the effects of diminishing inflammation and improving immunity are achieved.

However, in the actual use process, the therapeutic light emitted by the optical medical device has a low effective rate of reaching the scalp of the patient, resulting in poor therapeutic effect.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies of the prior art, it would be desirable to provide a head light medical device that solves the above-mentioned technical problems.

The present application provides a head photomedical device comprising:

a body;

the comb teeth are arranged on the body;

the telescopic structure is arranged in the comb teeth and can extend into or out of the end parts of the comb teeth;

a light source mounted on the telescopic structure for providing therapeutic irradiation light;

when the telescopic structure extends out of the end part of the comb teeth, the bottom of the telescopic structure is unfolded to enlarge the irradiation area of the light source.

According to the technical scheme that this application embodiment provided, extending structure is umbrella structure, umbrella structure includes that the top is fixed each other, bottom alternate segregation's a plurality of props umbrella unit.

According to the technical scheme provided by the embodiment of the application, the telescopic structure is a flexible horn structure.

According to the technical scheme provided by the embodiment of the application, a sliding sleeve is arranged in the comb teeth, and the telescopic structure is arranged in the sliding sleeve; the sliding sleeve is a cylindrical structure, and the inner diameter of the top of the cylindrical structure is gradually increased to the bottom of the cylindrical structure.

According to the technical scheme that this application embodiment provided, the light source is installed the extending structure top, the light that the light source sent is followed the extending structure kicks into to irradiation area.

According to the technical scheme that this application embodiment provided, the extending structure bottom is equipped with scattering structure and/or LED lamp pearl.

According to the technical scheme that this application embodiment provided, the extending structure bottom is equipped with globular brush head, scattering structure and/or LED lamp pearl set up in globular brush is first.

According to the technical scheme provided by the embodiment of the application, the scattering structure is a diamond body structure.

According to the technical scheme provided by the embodiment of the application, an elastic structure is arranged between the body and the comb teeth.

According to the technical scheme that this application embodiment provided, this internal installation is used for the drive the extending structure stretches into or stretches out the actuating mechanism of broach tip.

According to the technical scheme provided by the embodiment of the application, the body is of a scalp brush structure and is provided with an installation body and a handheld part which are integrally connected, and the comb teeth are fixed on the surface of the installation body.

According to the technical scheme provided by the embodiment of the application, the handheld part is a handle extending out of one side or the top of the installation body.

According to the technical scheme provided by the embodiment of the application, the body is in a hair hoop shape, and the comb teeth are arranged on the inner surface of the body.

According to the technical scheme that this application embodiment provided, the body is the tourus structure, the broach is radially installed on its inner wall.

According to the technical scheme that this application embodiment provided, the body is flexible material, this internal regulation area that is used for adjusting that is equipped with the radial size of body.

The beneficial effect of this application lies in: when the hair-care comb is used, the body is worn on the head of a patient or a user, and the comb teeth on the body can spread the hair of the head and move the hair to the upper part of the scalp; and controlling the telescopic structure to extend out of the comb teeth, expanding the bottom of the telescopic structure outwards at the moment, and emitting therapeutic irradiation light by a light source arranged on the telescopic structure to irradiate the scalp for photomedical treatment.

In the structure, the comb teeth are arranged to facilitate the hair to be pulled out conveniently; by arranging the telescopic structure in the comb teeth, the irradiation area of the light source is enlarged, the phototherapeutic area is increased, and the treatment efficiency is improved; meanwhile, the telescopic structure is matched with the comb teeth, so that the interference of hairs is avoided, the light source extends deep to the surface of the scalp, and the treatment effect is improved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of a head photomedical device provided herein;

FIG. 2 is a schematic structural view of the telescopic structure 4 shown in FIG. 1 extending out of the end of the comb teeth 3;

FIG. 3 is a partial enlarged view of portion A of FIG. 2;

fig. 4 is a schematic structural view of the light source 2 shown in fig. 2 disposed at the bottom of the telescopic structure 4;

FIG. 5 is a partial enlarged view of portion B shown in FIG. 4;

fig. 6 is a schematic structural view of the telescopic structure 4 shown in fig. 1 configured as a flexible horn;

FIG. 7 is a structural view of the body 1 shown in FIG. 1, which is shaped like a hair band;

fig. 8 is a schematic structural view of the body 1 shown in fig. 1 in a torus structure.

Reference numbers in the figures:

1. a body; 2. a light source; 3. comb teeth; 4. a telescopic structure; 5. an umbrella supporting unit; 6. a sliding sleeve; 7. a scattering structure; 8. a spherical brush head; 9. installing a body; 10. a handle; 11. an adjustment belt; 12. a through hole; 13. a drive rack; 14. a drive gear; 15. the motor is driven.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Please refer to fig. 1, which is a head optical medical device provided by the present application, including:

a body 1;

the hollow comb teeth 3 are arranged on the body 1;

the telescopic structure 4 is arranged in the comb teeth 3 and can extend into or out of the end parts of the comb teeth 3;

a light source 2 mounted on the telescopic structure for providing therapeutic irradiation light;

when the telescopic structure extends out of the end parts of the comb teeth 3, the bottom of the telescopic structure is unfolded to enlarge the irradiation area of the light source 2.

Specifically, the comb teeth 3 are a plurality of, that is, one, two or more, preferably, the comb teeth 3 are a plurality of and arranged.

Specifically, the light source 2 may selectively use the following wavelengths of therapeutic light:

1. the light source 2 is yellow green light with a wave band of 510 nm-590 nm, the irradiation depth of the light source is between blue light and red light, the dredging and expansion of capillary vessels at the skin depth can be promoted, the resistance of cells is enhanced, and the treatment effect of affected parts is accelerated;

2. the light source 2 is red light with a waveband of 590-810 nm, and can enable mitochondria to release cytochrome c oxidase, increase adenosine triphosphate, and enable cells to provide energy by using the adenosine triphosphate, so that the metabolism of the cells is promoted; meanwhile, the red light irradiation heats molecules in the blood vessel, so as to adjust the blood vessel expansion and improve the blood circulation;

3. the light source 2 is blue light with a wave band of 440-510 nm, and can be used for relieving pain and swelling caused by inflammation;

4. the light source 2 simultaneously comprises at least two of the three types of therapeutic light with different wavelengths.

The treatment area in this embodiment is the area to be treated on the scalp surface of the head of the user or patient.

Specifically, the number of the comb teeth 3 is one, two or more; in this embodiment, the comb teeth 3 are provided in plural, and the plural comb teeth 3 are arranged in an array, so that the hairs on the head can be easily plucked and the telescopic structure therein can be extended and expanded to contact with the treatment region.

In the embodiment, the comb teeth 3 are rubber tubes, and in other embodiments, the comb teeth 3 may also be plastic hoses; the rubber tube can be made of silica gel, and the plastic hose is made of a composite material of polypropylene and a thermoplastic elastomer.

In the present embodiment, as shown in fig. 1, the body 1 is a scalp brush structure, and has an installation body 9 and a hand-held portion integrally connected, and the comb teeth 3 are fixed on the surface of the installation body 9. The mounting body 9 and the hand-held part can also be assembled structures, and the two are fixedly connected with each other through fasteners. The fasteners may be screws, bolts, rivets, etc.

In a preferred form, the hand-held portion is a handle 10 extending from one side or the top of the mounting body 9. The handle 10 is arranged, so that the handheld use can be facilitated; meanwhile, the body 1 can be moved to other treatment areas of the head for treatment according to treatment time, so that targeted treatment operation is facilitated.

In this embodiment, the body 1 is provided with a control module, and the control module is used for providing electric energy for the light source 2 and controlling the light source 2 to be turned on and off; preferably, the body 1 is further connected with a control button through a wire or wirelessly connected with a remote control module, and the control button is arranged on the remote control module. In a preferred manner, the control module may adjust the duty cycle of the input current or voltage to achieve different intensities of light therapy, adapting to different severity of the disease region.

In this embodiment, preferably, the bottom of the spherical brush head 8 is provided with a nano-scale protrusion structure, and the nano-scale protrusion can play a role in light uniformization.

Specifically, the nano-scale convex structure can be formed by means of stamping or 3D printing.

In this embodiment, as shown in fig. 1 and 2, the telescopic structure 4 is an umbrella-shaped structure, and the umbrella-shaped structure includes a plurality of umbrella supporting units 5 with top portions fixed to each other and bottom portions separated from each other.

Specifically, the number of the umbrella supporting units 5 can be several, that is, one, two or more, and preferably, at least 3 umbrella supporting units 5 are provided;

specifically, the umbrella supporting unit 5 may be an arc-shaped rod-shaped structure or a linear rod-shaped structure; the tops of the umbrella supporting units 5 are fixedly connected with each other, and the bottoms of the umbrella supporting units are separated from each other;

when the umbrella supporting unit 5 extends into the comb teeth 3, the umbrella supporting unit is constrained by the size of the port of the comb teeth 3, deforms inwards and enters the comb teeth 3;

when the umbrella opening unit 5 extends out of the comb teeth 3, the umbrella opening unit 5 is restored and is unfolded outward.

In this embodiment, the light source 2 is installed on the top of the telescopic structure, and the light emitted from the light source 2 is emitted to the irradiation area along the telescopic structure 4.

Specifically, the light source 2 is arranged at the top of the telescopic structure, so that the treatment light emitted by the light source 2 can be guided to the surface of the scalp along the telescopic structure 4; for example, as shown in fig. 1, the therapeutic light can be guided to the surface of the scalp along the inner side wall of the umbrella-shaped structure formed by a plurality of umbrella supporting units 5;

in this embodiment, a driving mechanism for driving the telescopic structure 4 to extend into or extend out of the end of the comb teeth 3 is installed in the body 1.

In a preferred embodiment, the driving mechanism comprises a driving motor 15 installed in the body 1, a driving gear 14 installed on a rotating shaft of the driving motor 15, and a driving rack 13 connected with the driving gear 14; the bottom of the driving rack 13 extends into the comb teeth 3 and is fixedly connected with the top of the telescopic structure 4 in the comb teeth 3.

Through the structure, when the driving motor 15 rotates forwards and backwards, the driving rack 13 can be driven to move up and down, and then the telescopic structure 4 is driven to extend into or extend out of the comb teeth 3.

The working principle is as follows: the body 1 is worn on the head of a patient or a user, and in the wearing process, the comb teeth 3 on the body 1 can spread the hair of the head and move the hair to the upper part of the scalp; the telescopic structure 4 is controlled to extend out of the comb teeth 3, as shown in fig. 2, at this time, the bottom of the telescopic structure 4 is expanded outwards, and the light source 2 installed on the telescopic structure 4 emits irradiation light for treatment to irradiate the scalp, so that the photomedical effect is achieved.

In the structure, the comb teeth 3 are arranged to facilitate the hair to be pulled out conveniently; the telescopic structure 4 is arranged in the comb teeth 3, so that the irradiation area of the light source 2 is enlarged, the phototherapeutic area is increased, and the treatment efficiency is improved; meanwhile, the telescopic structure 4 is matched with the comb teeth 3, so that the interference of hairs is avoided, the light source extends deep to the surface of the scalp, and the treatment effect is improved.

Example 2

On the basis of embodiment 1, in this embodiment, the light source 2 is disposed at the bottom of the telescopic structure 4 (i.e., the plurality of umbrella supporting units 5) and the light source 2 is an LED lamp bead; by arranging the light source 2 at the bottom of the telescopic structure 4, the light source 2 can be contacted with the surface of the scalp; meanwhile, heat energy emitted by the light source 2 can perform hot compress on the scalp surface, and assistance is provided for photomedical treatment.

In this embodiment, the LED light source may be optionally specifically arranged in the following manner:

in the mode 1, a single LED lamp bead is arranged at the bottom of an umbrella supporting unit 5, at the moment, the umbrella supporting unit 5 preferably adopts a hollow structure with an opening at the bottom, and the opening at the bottom of the umbrella supporting unit 5 is provided with a clamping interface; the wiring end of the LED lamp bead is clamped at the opening at the bottom of the umbrella supporting unit 5; the wiring of the LED lamp beads is arranged in the hollow cavity of the umbrella supporting unit 5. Of course, alternatively, the single LED lamp bead may also be fixed to the bottom end of the umbrella supporting unit 5 by gluing. The LED bead may be, for example, a mini-LED of 0.2mm by 0.1 mm.

Modes 2 and 2 LED lamp beads are arranged at the bottom of the umbrella supporting unit 5, any one mode of the mode 1 can be selected as the fixing mode of the 2 LED lamp beads and the umbrella supporting unit 5, the included angle of the central axes of the LED lamp beads is 90-180 degrees, and in the embodiment, the included angle is 180 degrees; because the light-emitting angle of the LED lamp bead is 90-180 degrees, the irradiation range is limited; by setting the included angle, the area of the light source irradiation area at the bottom of the umbrella supporting unit 5 can be enlarged;

in the mode 3, the plurality of LED lamp beads are arranged at the bottom of the umbrella supporting unit 5, and the fixing mode of the plurality of LED lamp beads and the umbrella supporting unit 5 can be selected to adopt any one mode of the mode 1, so that the included angle of the central axes of the plurality of LED lamp beads is 0-180 degrees, preferably 90-180 degrees; in this embodiment, the included angle is 120 degrees; a plurality of LED lamp pearls evenly distributed is on a hemisphere profile, further enlarges the light source irradiation area of opening the umbrella unit 5 bottom.

For example, when 3 LED lamp beads are provided, the light-emitting angle b of the LED light source is set to be 120 degrees, the included angle between the LED lamp beads is 60 degrees, and the three LED lamp beads are uniformly distributed along the circumferential direction of the end part of the comb tooth 3; through setting up three LED lamp pearl for the LED light source can be followed 360 degrees direction transmission treatment light sources, has enlarged the irradiation area of light source.

Example 3

On the basis of embodiment 1, in this embodiment, as shown in fig. 3, a scattering structure 7 is disposed at the bottom of the telescopic structure 4; specifically, the number of the scattering structures 7 may be plural; for example: as shown in fig. 2 and 3, the scattering structures 7 are respectively arranged at the bottom of each umbrella supporting unit 5;

specifically, through setting up scattering structure 7 for when treatment light kicked into when scattering structure 7, treatment light can be through the plane refraction, the reflection of all directions, finally kicked into to the scalp surface, has improved the degree of consistency of light, has improved the divergent area of light.

Wherein the configuration of the scattering structure 7 is: any one of a multi-plane body structure, a multi-curved body structure and a polygonal rotating body structure. In this embodiment, the scattering structure 7 is a multi-plane diamond structure, and the number of scattering surfaces of the multi-plane diamond structure is preferably 5 to 100, and more preferably 30 to 60, so as to increase the scattering effect on light.

Wherein, the scattering structure 7 is made of transparent plastic, mozzarella or transparent glass; the transparency is 50% -90%; a refractive index of 1.1 to 2.0, preferably 1.4 to 1.6; the whole length is 10um-5 mm.

Example 4

On the basis of embodiment 3, in this embodiment, as shown in fig. 4 and 5, a spherical brush head 8 is arranged at the bottom of the telescopic structure 4;

in a preferred embodiment, a plurality of spherical brush heads 8 are arranged at the end part of each umbrella supporting unit 5; the scattering structure 7 is arranged in the spherical brush head 8. Through setting up globular brush head 8 for to scattering structure 7 has played the guard action, also further carries out the scattering simultaneously to the light, has enlarged treatment light region.

In a preferred embodiment, the light source 2 is an LED lamp bead and the LED lamp bead is installed in the scattering structure 7.

Example 5

On the basis of embodiment 1, in this embodiment, as shown in fig. 6, the telescopic structure 4 is a flexible horn structure.

When flexible horn body structure stretch into to in the broach 3, receive the restraint of broach 3, the inside compression of flexible horn body structure enters into to in the broach 3.

When flexible horn body structure stretches out when broach 3, the binding force disappears, flexible horn body bottom is outwards expanded, has realized enlarging the effect of light path, equipartition light.

In a preferred embodiment, the light source 2 is LED lamp beads, and the LED lamp beads are uniformly distributed at the bottom of the flexible horn body.

In a preferred embodiment, the bottom of the flexible horn is further provided with a scattering structure 7, and the light source 2 is arranged in the scattering structure 7.

In a preferred embodiment, the bottom of the flexible horn is further provided with a spherical brush head 8, and the scattering structure 7 is arranged in the spherical brush head 8.

Example 6

On the basis of embodiment 1, in this embodiment, as shown in fig. 1 and fig. 2, a sliding sleeve 6 is disposed in the comb teeth 3, and the telescopic structure 4 is disposed in the sliding sleeve 6; the sliding sleeve 6 is of a cylindrical structure, and the inner diameter of the cylindrical structure gradually increases from the top to the bottom; preferably, the sliding sleeve is of a horn or cone structure.

Specifically, the sliding sleeve 6 can be fixedly arranged in the comb teeth 3 through a fastener; the sliding sleeve 6 is arranged, so that the comb teeth 3 are prevented from being worn in the reciprocating motion process of the telescopic structure 4; meanwhile, the sliding sleeve 6 and the comb teeth 3 can be detachably assembled and connected, so that the replacement is convenient; because sliding sleeve 6 is horn body or centrum structure, can reduce extending structure 4 with the deformation effort of sliding sleeve 6 port department reduces mutual interference, avoids extending structure wearing and tearing, damage.

Example 7

In addition to embodiment 1, in this embodiment, an elastic structure is installed between the main body 1 and the comb teeth 3.

Specifically, the length and the arrangement mode of the comb teeth 3 are adapted to the shape of the head, that is, all the end parts of the comb teeth 3 jointly form an arc-shaped curved surface, and the shape of the head of the arc-shaped curved surface is adapted to the shape of the head of the patient, so that the comb teeth 3 can be in contact with the head of the patient after the patient wears the comb teeth.

Specifically, the elastic structure is a structure or material capable of generating deformation, such as latex, a spring device or sponge; by arranging the elastic structure, each comb tooth 3 can be contacted with a treatment area, so that the treatment effect is improved; so that the utility model is not limited by the head difference of the user and has universal applicability; so that the comb teeth 3 have a certain amount of extension and retraction, can massage the scalp, and is also helpful for improving the treatment effect.

In a preferred embodiment, an air bag is arranged in the body 1, and the comb teeth 3 can stretch and contract under the action of elastic deformation of the air bag.

In a preferred embodiment, the comb teeth 3 have a telescopic function, that is, an elastic member is installed between the top of the comb teeth 3 and the comb tooth main body 5 or between the comb tooth main body 5 and the ball-shaped brush head 6, and the elastic member may be a spring, a rubber sheet, a sponge, or the like.

Example 8

In addition to embodiment 1, in this embodiment, the shape of the body 1 is changed to a hair band shape;

as shown in fig. 7, the body 1 has a hair band shape, and the comb teeth 3 are provided on the inner surface thereof. The body 1 is provided in a hair band shape so that wearing therapy can be facilitated.

Example 9

On the basis of embodiment 1, in this embodiment, the shape of the body 1 is replaced by a circular ring structure;

as shown in fig. 8, the body 1 is a torus structure, and the comb teeth 3 are radially mounted on the inner wall thereof.

Specifically, the body 1 is made of flexible materials, and an adjusting belt 11 for adjusting the radial size of the body 1 is arranged in the body 1; the body 1 is a hollow annular structure, namely an annular space is arranged in the body 1; the adjusting belt 11 surrounds the annular space inside the adjusting belt and extends out through the through hole 12 in the side wall of the body 1, and the radial size of the body 1 can be adjusted by adjusting the adjusting belt 11 so as to meet the use requirements of different users.

Wherein, the refractive index of the comb teeth 3 is 1.1-2.0, preferably 1.4-1.6.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.