Ultrathin blackboard lamp with hidden light source

Abstract

The ultrathin blackboard lamp with the hidden light source comprises a shell, a light source piece, a polarized light transmitting piece and a light reflecting piece, a containing cavity is formed in the shell, the polarized light transmitting piece and the light reflecting piece are both arranged in the containing cavity, an upper installation part is arranged on the upper portion of the shell, a hidden cavity is formed in the upper installation part, and the light reflecting piece is arranged in the hidden cavity. The hidden cavity is arranged above the containing cavity, the light source piece is arranged in the hidden cavity, the polarized light transmitting piece further comprises a first side extending part, the first side extending part protrudes from the light receiving part to the direction where the light outlet is located, the first side extending part comprises a first emergent face, a second emergent face and a third emergent face, and the second emergent face is arranged above the first emergent face. And the first emergent surface, the second emergent surface and the third emergent surface are obliquely arranged. By means of the blackboard lamp, a light source can be hidden, strong light stimulation generated when a user directly looks at the blackboard lamp is avoided, and using comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blackboard lamps, in particular to an ultra-thin blackboard lamp with a hidden light source. Background Art

[0002] The use of traditional blackboard lamps is very wide, especially in the field of education. Blackboard lamps are usually composed of light sources, reflectors and lenses. The light source is the core component of the blackboard lamp. It can be a traditional high-pressure mercury lamp, metal halide lamp or LED light source. The light source converts electrical energy into light energy to produce strong light. The reflector is located behind the light source and focuses the light onto the lens. The lens projects the light onto the blackboard or whiteboard to form a clear image. In traditional blackboard lamps, the light source is usually easily exposed to the outside, or the light emitted is easy to produce direct radiation. When teachers or students look at the blackboard, they are likely to look directly at the light source at certain angles and see the direct light, which produces a glare, which can cause discomfort to the eyes and reduce the readability of the information. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an ultra-thin blackboard lamp with hidden light source, which can hide the light source, avoid strong light stimulation when looking directly at the blackboard lamp, and improve the comfort of use.

[0004] In order to solve the above technical problems, the utility model provides an ultra-thin blackboard lamp with a hidden light source, comprising a shell, a light source component, a polarized light-transmitting component and a reflective component. A accommodating cavity is provided in the shell, and the polarized light-transmitting component and the reflective component are both arranged in the accommodating cavity.

[0005] An upper mounting portion is provided on the upper portion of the shell, a hidden cavity is provided in the upper mounting portion, the hidden cavity is provided above the accommodating cavity, the light source component is provided in the hidden cavity, the light emitting surface of the light source component faces the polarized light transmitting component, the shell is provided with a light outlet, the light outlet is provided on the side of the accommodating cavity, and the reflective component is provided on a side of the polarized light transmitting component away from the light outlet.

[0006] As an improvement of the above-mentioned scheme, the polarized light transmissive component includes a light receiving portion, which is arranged at the upper portion of the polarized light transmissive component and located below the light source component, and the light receiving portion includes a front light receiving surface and side light receiving surfaces arranged on both sides of the front light receiving surface, the front light receiving surface is located below the light source component, one side of the side light receiving surface is respectively connected to the two sides of the front light receiving surface, and the other side of the side light receiving surface extends upward at an angle away from the front light receiving surface.

[0007] As an improvement of the above-mentioned scheme, the polarized light-transmitting element also includes a first side extension portion, which protrudes from the light receiving portion toward the direction where the light exit is located, and the first side extension portion includes a first exit surface, a second exit surface and a third exit surface, the first exit surface is connected to the second exit surface, the second exit surface is connected to the third exit surface, and the first exit surface, the second exit surface and the third exit surface are all inclined.

[0008] As an improvement of the above solution, the inclination angle range of the first exit surface and the horizontal plane is 20°-30°; the inclination angle range of the second exit surface and the horizontal plane is 40°-50°; the inclination angle range of the third exit surface and the horizontal plane is 10°-20°.

[0009] As an improvement of the above solution, the upper mounting portion includes a top plate, a first folded plate and a second folded plate respectively connected to two sides of the top plate, and the first folded plate, the top plate and the second folded plate form the hidden groove.

[0010] As an improvement of the above solution, the polarized light-transmitting element also includes a second side extension portion, which extends in a direction away from the light outlet, and includes a rear abutment surface, which is parallel to the side of the reflector and is arranged on the side of the reflector.

[0011] As an improvement of the above-mentioned scheme, the polarized light transmissive component also includes a main emitting surface and a reflecting surface, the main emitting surface is arranged on the side of the polarized light transmissive component close to the light outlet, the main emitting surface is vertically arranged and connected to the first emitting surface; the reflecting surface is arranged on the side away from the light outlet, the reflecting surface is connected to the rear abutting surface through a transition surface, and the transition surface is inclined downward from the rear abutting surface toward the side close to the light outlet.

[0012] As an improvement of the above scheme, the upper mounting portion also includes a first mounting hook groove and a second mounting hook groove, the first mounting hook groove and the second mounting hook groove are respectively arranged at the lower ends of the first folding plate and the second folding plate, the bottom of the outer shell is provided with a lower mounting portion, the lower mounting portion includes a first plug-in groove and a second plug-in groove, the upper and lower ends of the reflective element are respectively arranged between the first mounting hook groove and the first plug-in groove, and the bottom of the polarized light-transmitting element is provided with a plug-in portion, and the plug-in portion can be inserted into the second plug-in groove.

[0013] As an improvement of the above scheme, the lower mounting part also includes a third insertion slot, and the third insertion slot and the second mounting hook slot form the light outlet. The ultra-thin blackboard lamp with hidden light source also includes a diffuser plate, and the diffuser plate is arranged between the third insertion slot and the second mounting hook slot.

[0014] As an improvement of the above solution, the polarized light transmitting element is a Fresnel polarized lens, and the reflective surface is a toothed surface.

[0015] The implementation of this utility model has the following beneficial effects:

[0016] The utility model discloses an ultra-thin blackboard lamp with hidden light source, which is provided with a shell, a light source component, a polarized light-transmitting component and a reflective component, wherein the polarized light-transmitting component and the reflective component are both arranged in the accommodating cavity of the shell, the light source component is arranged in the hidden cavity of the shell, the hidden cavity can hide the light source component in the upper mounting portion of the shell, and the light-emitting surface of the light source component faces the polarized light-transmitting component below the hidden cavity, the light enters the polarized light-transmitting component from top to bottom, and the light outlet of the shell is arranged at the side of the accommodating cavity, and part of the light entering the polarized light-transmitting component will be emitted from the side of the accommodating cavity. The light reflected or refracted in the accommodating cavity will be reflected by the reflective member back into the polarized light transmitting member. Therefore, the light source member can be hidden by the arrangement of the optical path of the hidden cavity and the light source member and the relative position arrangement of the polarized light transmitting member, the reflective member and the light outlet. Moreover, the light directly emitted by the light source member will not be transmitted from the outer shell. Therefore, when teachers or students look directly at the ultra-thin blackboard lamp with the hidden light source, they will not see the direct light transmitted through it, thereby avoiding strong light stimulation when looking directly at the blackboard lamp and improving the comfort of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the ultra-thin blackboard lamp with hidden light source of the utility model;

[0018] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the ultra-thin blackboard lamp with hidden light source of the utility model;

[0019] Figure 3 yes Figure 2 A partial enlarged view of middle A;

[0020] Figure 4 yes Figure 2 A partial enlarged view of B in the middle;

[0021] Figure 5 This is a schematic diagram of the light path of the ultra-thin blackboard lamp with hidden light source of the utility model;

[0022] Figure 6 It is a schematic diagram of the optical path of the first side extension of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail with reference to the accompanying drawings. It is hereby stated that the directional words such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the utility model are only based on the accompanying drawings of the utility model, and are not specific limitations of the utility model.

[0024] See also Figure 1 , Figure 2 and Figure 5 The embodiment of the utility model discloses an ultra-thin blackboard lamp with hidden light source, comprising a housing 1, a light source component 2, a polarized light-transmitting component 3 and a reflective component 4. The housing 1 is provided with a receiving cavity 11, and the polarized light-transmitting component 3 and the reflective component 4 are both arranged in the receiving cavity 11. The polarized light-transmitting component 3 is used to reflect and refract the light emitted by the light source component 2. The polarized light-transmitting component 3 has different refractive indices for light of different wavelengths. The reflective component 4 is used to reflect the light. The light source component 2 is preferably an LED lamp.

[0025] An upper mounting portion 14 is provided on the upper portion of the housing 1, and a hidden cavity 12 is provided inside the upper mounting portion 14. The hidden cavity 12 is provided inside the upper mounting portion 14 and above the accommodating cavity 11. The light source component 2 is provided in the hidden cavity 12. The hidden cavity 12 can hide the light source component 2 to prevent the user from directly viewing the light source from the outside of the housing 1. In order to enable the light emitted by the light source 2 to shine on the blackboard, the light emitting surface of the light source 2 faces the polarized light transmittance component 3, and the light emitted by the light source 2 is refracted into the polarized light transmittance component 3. The housing 1 is provided with a light outlet 13, and the light outlet 13 is provided on the side of the accommodating cavity 11. The light reflected or refracted in the polarized light transmittance component 3 can be emitted from one side of the polarized light transmittance component 3 to the light outlet 13 and illuminate the blackboard. The reflective component 4 is provided on the side of the polarized light transmittance component 3 away from the light outlet 13, and can reflect the light refracted from the side of the polarized light transmittance component 3 away from the light outlet 13, so that the light returns to the polarized light transmittance component 3. In addition, the reflective component 4 also plays a role in shielding direct light.

[0026] The beneficial effects of the embodiments of the utility model are as follows:

[0027] The ultra-thin blackboard lamp with hidden light source in the embodiment of the utility model is provided with a shell 1, a light source component 2, a polarized light-transmitting component 3 and a reflective component 4, wherein the polarized light-transmitting component 3 and the reflective component 4 are both arranged in the accommodating cavity 11 of the shell 1, the light source component 2 is arranged in the hidden cavity 12 of the shell 1, the hidden cavity 12 can hide the light source component 2 in the upper mounting portion 14 of the shell 1, and the light-emitting surface of the light source component 2 faces the polarized light-transmitting component 3 below the hidden cavity 12, and the light enters the polarized light-transmitting component 3 from top to bottom, and the light outlet 13 of the shell 1 is arranged on the side of the accommodating cavity 11, and part of the light entering the polarized light-transmitting component 3 The light will be refracted from the side of the accommodating cavity 11, and the light reflected or refracted in the accommodating cavity 11 will be reflected by the reflector 4 back into the polarized light transmitting component 3. Therefore, the light source component 2 can be hidden by the optical path setting of the hidden cavity 12 and the light source component 2 and the relative position setting of the polarized light transmitting component 3, the reflector 4 and the light outlet 13. Moreover, the light directly emitted by the light source component 2 will not be transmitted from the outer shell 1. Therefore, when teachers or students look directly at the ultra-thin blackboard lamp with the hidden light source, they will not see the direct light transmitted, thereby avoiding strong light stimulation when looking directly at the blackboard lamp, thereby improving the comfort of use.

[0028] Specifically, see Figure 3 The polarized light transmitting member 3 includes a light receiving portion 31, which is disposed on the upper portion of the polarized light transmitting member 3 and below the light source member 2. The light receiving portion 31 is used to receive light from the light source member 2. The light receiving portion 31 includes a front light receiving surface 311 and side light receiving surfaces 312 disposed on both sides of the front light receiving surface 311. The front light receiving surface 311 is located below the light source member 2. The front light receiving surface 311 receives most of the light emitted by the light source member 2. One side of the side light receiving surface 312 is respectively connected to both sides of the front light receiving surface 311, and the other side of the side light receiving surface 312 extends upwardly and obliquely away from the front light receiving surface 311. The oblique light emitted from the side of the light source member 2 will enter the polarized light transmitting member 3 from the side light receiving surface 312. The side light receiving surfaces 312 and the front light receiving surface 311 can ensure that light can accurately enter the polarized light transmitting member 3.

[0029] See also Figure 4The first side extension portion 32 includes a first emitting surface 321, a second emitting surface 322 and a third emitting surface 323, the first emitting surface 321 is connected to the second emitting surface 322, the second emitting surface 322 is connected to the third emitting surface 323, the first emitting surface 321, the second emitting surface 322 and the third emitting surface 323 are all inclined, and the first emitting surface 321, the second emitting surface 322 and the third emitting surface 323 have different inclination angles, by setting the first emitting surface 321, the second emitting surface 322 and the third emitting surface 323 continuously. When light is refracted from the three exit surfaces, three illumination ranges are formed. By reasonably setting the vertical heights and inclination angles occupied by the first exit surface 321, the second exit surface 322 and the third exit surface 323, the first exit surface 321, the second exit surface 322 and the third exit surface 323 can be made to correspond to the upper, middle and lower areas of the blackboard respectively, thereby controlling the brightness of light falling on different areas of the blackboard in a region-refined manner, thereby obtaining a more uniform brightness distribution effect.

[0030] Further, see Figure 4 and Figure 5 , the inclination angle α between the first emitting surface 321 and the horizontal plane is in the range of 20°-30°; the inclination angle β between the second emitting surface 322 and the horizontal plane is in the range of 40°-50°; the inclination angle θ between the third emitting surface 323 and the horizontal plane is in the range of 10°-20°. The inclination angle of the second emitting surface 322 is relatively large, and is mainly used to refract most of the light to the middle of the blackboard to ensure that the commonly used part in the middle of the blackboard obtains a better lighting effect, while the inclination angles of the first emitting surface 321 and the third emitting surface 323 are relatively small, and are mainly used to compensate for the lighting effect of the upper and lower positions of the blackboard, thereby avoiding the situation in which the brightness of the traditional blackboard lamp irradiating the upper and lower parts of the blackboard is not enough, thereby forming uneven brightness.

[0031] An upper mounting portion 14 is provided on the upper portion of the housing 1, and the upper mounting portion 14 includes a top plate 141, a first folding plate 142 and a second folding plate 143 respectively connected to both sides of the top plate 141, the first folding plate 142 and the second folding plate 143 are both folded back from the outer side of the top plate 141 to the side of the housing 1, and fix and shield the light source 2, the first folding plate 142, the top plate 141 and the second folding plate 143 form a hidden cavity 12, and the light source 2 is arranged in the hidden cavity 12 to achieve the effect of hiding the light source.

[0032] The polarized light transmitting member 3 further comprises a second side extension portion 33, the height of the second side extension portion 33 corresponds to the height of the first side extension portion 32, the second side extension portion 33 extends in a direction away from the light outlet 13, and the second side extension portion 33 comprises a rear abutting surface 331, the rear abutting surface 331 is parallel to the side of the reflector 4 and is arranged on the side of the reflector 4. During installation, the rear abutting surface 331 can be inserted against the surface of the reflector 4, and the reflector 4 also forms a limiting effect on the rear abutting surface 331. In addition, the rear abutting surface 331 can allow the light reflected from the reflector 4 to directly enter the second side extension portion 33 through the rear abutting surface 331, and can be refracted by the first side extension portion 32 to supplement the light of the first side extension portion 32, and the supplementary light path is shorter and more efficient.

[0033] In addition, the polarized light transmitting element 3 also includes a main emitting surface 34 and a reflecting surface 35, the main emitting surface 34 is arranged on the side of the polarized light transmitting element 3 close to the light outlet 13, the main emitting surface 34 is vertically arranged and connected to the first emitting surface 321, and the reflecting surface 35 is arranged on the side away from the light outlet 13, that is, the main emitting surface 34 and the reflecting surface 35 are respectively arranged on different sides of the polarized light transmitting element 3, wherein the reflecting surface 35 is close to the reflective element 4, and the reflecting surface 35 is connected to the rear abutting surface 331 through a transition surface 36, and the transition surface 36 is inclined downward from the rear abutting surface 331 toward the side close to the light outlet 13. After the light from the light source 2 is refracted into the polarized light transmitting member 3, part of the light is refracted out from the first side extension 32; part of the light is reflected between the main emitting surface 34 and the reflecting surface 35, most of this part of the light can be refracted out through the main emitting surface 34, and the remaining part will continue to be reflected between the main emitting surface 34 and the reflecting surface 35; part of the light is refracted out from the reflecting surface 35 and reflected back to the polarized light transmitting member 3 by the reflecting member 4, and most of this part of the light can also be refracted out through the main emitting surface 34. The light refracted out from the main emitting surface 34 will supplement the illumination of the blackboard at different angles to increase the brightness of the blackboard.

[0034] Furthermore, in order to improve the brightness uniformity, the polarized light transmitting element 3 is a Fresnel polarized lens, and the reflective surface 35 is a toothed surface. The Fresnel polarized lens can convert non-polarized light into polarized light. The light passing through the polarized light transmitting element 3 will be polarized. The polarization angle and refraction angle of light of different wavelengths are different. By utilizing this characteristic, part of the blue light emitted by the light source element 2 can be refracted at a larger angle so that it does not fall on the main body of the illuminated object, thereby achieving the effect of preventing blue light. The toothed surface can focus the light, so that the light refracted by the main exit surface 34 is brighter and more concentrated. The toothed surface has a plurality of oblique teeth, and the oblique teeth are arranged from top to bottom toward the side away from the reflective element 4. The angle between the inclined surface of the oblique teeth and the horizontal plane is in the range of 75°-88°. By arranging the oblique teeth, the light can be reflected obliquely downward in the reflective surface 35, and the light reflected back from the reflective element 4 can be refracted obliquely downward so that the light can fall on the blackboard obliquely below. At the same time, by reasonably setting the angle of the inclined surface of the beveled teeth, the blue light can be repeatedly reflected between the reflection surface 35 and the main emission surface 34 until most of the blue light is absorbed by the inner wall of the housing 1, thereby further eliminating the blue light. In addition, compared with the traditional spherical lens, since the polarized light transmitting element 3 has the beveled teeth, the beveled teeth can simulate the curved surface of the spherical lens to achieve the refraction of light. Since the beveled teeth are not a continuous curved surface, the polarized light transmitting element 3 can achieve a thinner design, so that the ultra-thin blackboard lamp with hidden light source has the advantage of thin thickness.

[0035] For easy installation, the upper mounting portion 14 further includes a first mounting hook groove 144 and a second mounting hook groove 145, which are respectively arranged at the lower ends of the first folding plate 142 and the second folding plate 143. The bottom of the housing 1 is provided with a lower mounting portion 15, which includes a first insertion groove 151 and a second insertion groove 152. The upper and lower ends of the reflector 4 are respectively arranged between the first mounting hook groove 144 and the first insertion groove 151. During installation, the reflector 4 is inserted between the first mounting hook groove 144 and the first insertion groove 151, and the first mounting hook groove 144 and the first insertion groove 151 form a limit fixation for the reflector 4. The bottom of the polarized light transmitting member 3 is provided with an inserting portion, which can be inserted into the second insertion groove 152 during installation, and the second insertion groove 152 forms a limit fixation for the polarized light transmitting member 3. The first installation hook groove 144 and the second installation hook groove 145 also play a role in shielding the side light of the light source component 2.

[0036] The ultra-thin blackboard lamp with hidden light source also includes a diffusion plate 5, which can evenly disperse and scatter the light from the polarized light-transmitting member 3, so as to achieve a more uniform lighting effect. The blue light emitted from the polarized light-transmitting member 3 will also be absorbed and mixed when entering the diffusion plate 5, so as to achieve the effect of further eliminating blue light. The lower mounting portion 15 also includes a third insertion slot 153, and the third insertion slot 153 and the second mounting hook slot 145 form the light outlet 13, that is, the diffusion plate 5 is arranged in the light outlet 13 to disperse and scatter the light entering the diffusion plate 5, so as to further improve the uniformity of the blackboard brightness. After testing, the average illumination of the embodiment of the utility model can reach 737l x, the uniformity reaches 0.91, the minimum / maximum illumination is 0.84, and the uniformity of brightness is better. The diffusion plate 5 is disposed between the third insertion slot 153 and the second installation hook slot 145 . During installation, the diffusion plate 5 is inserted between the third insertion slot 153 and the second installation hook slot 145 .

[0037] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications are also considered to be within the protection scope of the present utility model.

Claims

1. An ultra-thin blackboard lamp with hidden light source, characterized in that: It comprises a housing, a light source, a polarized light-transmitting element and a reflective element, wherein a receiving cavity is provided in the housing, and the polarized light-transmitting element and the reflective element are both provided in the receiving cavity; An upper mounting portion is provided on the upper portion of the shell, a hidden cavity is provided in the upper mounting portion, the hidden cavity is provided above the accommodating cavity, the light source component is provided in the hidden cavity, the light emitting surface of the light source component faces the polarized light transmitting component, the shell is provided with a light outlet, the light outlet is provided on the side of the accommodating cavity, and the reflective component is provided on a side of the polarized light transmitting component away from the light outlet.

2. The ultra-thin blackboard lamp with hidden light source according to claim 1, characterized in that: The polarized light transmitting component includes a light receiving portion, which is arranged at the upper portion of the polarized light transmitting component and located below the light source component. The light receiving portion includes a front light receiving surface and side light receiving surfaces arranged on both sides of the front light receiving surface. The front light receiving surface is located below the light source component, one side of the side light receiving surface is respectively connected to the two sides of the front light receiving surface, and the other side of the side light receiving surface extends upward at an angle away from the front light receiving surface.

3. The ultra-thin blackboard lamp with hidden light source according to claim 2, characterized in that: The polarized light-transmitting element also includes a first side extension portion, which protrudes from the light receiving portion toward the direction where the light outlet is located, and the first side extension portion includes a first exit surface, a second exit surface and a third exit surface, the first exit surface is connected to the second exit surface, the second exit surface is connected to the third exit surface, and the first exit surface, the second exit surface and the third exit surface are all inclined.

4. The ultra-thin blackboard lamp with hidden light source according to claim 3, characterized in that: The inclination angle between the first exit surface and the horizontal plane is in the range of 20°-30°; the inclination angle between the second exit surface and the horizontal plane is in the range of 40°-50°; and the inclination angle between the third exit surface and the horizontal plane is in the range of 10°-20°.

5. The ultra-thin blackboard lamp with hidden light source according to claim 1, characterized in that: The upper mounting portion includes a top plate, a first folded plate and a second folded plate respectively connected to two sides of the top plate, and the first folded plate, the top plate and the second folded plate surround the hidden cavity.

6. The ultra-thin blackboard lamp with hidden light source according to claim 3, characterized in that: The polarized light-transmitting element further includes a second side extension portion extending in a direction away from the light outlet, and the second side extension portion includes a rear abutment surface parallel to the side surface of the reflector and arranged on the side of the reflector.

7. The ultra-thin blackboard lamp with hidden light source according to claim 6, characterized in that: The polarized light transmitting component also includes a main emitting surface and a reflecting surface. The main emitting surface is arranged on a side of the polarized light transmitting component close to the light exit port, and the main emitting surface is vertically arranged and connected to the first emitting surface; the reflecting surface is arranged on a side away from the light exit port, and the reflecting surface is connected to the rear abutting surface through a transition surface, and the transition surface is inclined downward from the rear abutting surface toward the side close to the light exit port.

8. The ultra-thin blackboard lamp with hidden light source according to claim 5, characterized in that: The upper mounting portion also includes a first mounting hook groove and a second mounting hook groove, and the first mounting hook groove and the second mounting hook groove are respectively arranged at the lower ends of the first folding plate and the second folding plate. The bottom of the shell is provided with a lower mounting portion, and the lower mounting portion includes a first plug-in groove and a second plug-in groove. The upper and lower ends of the reflective member are respectively arranged between the first mounting hook groove and the first plug-in groove. The bottom of the polarized light-transmitting member is provided with a plug-in portion, and the plug-in portion can be inserted into the second plug-in groove.

9. The ultra-thin blackboard lamp with hidden light source according to claim 8, characterized in that: The lower mounting portion further includes a third insertion slot, and the third insertion slot and the second mounting hook slot form the light outlet. The ultra-thin blackboard lamp with hidden light source further includes a diffusion plate, and the diffusion plate is arranged between the third insertion slot and the second mounting hook slot.

10. The ultra-thin blackboard lamp with hidden light source according to claim 7, characterized in that: The polarized light transmitting element is a Fresnel polarized lens, and the reflecting surface is a toothed surface.

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