54results about How to "Reduce stray light" patented technology

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of seven lenses, and the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side; the at least one spacer comprises a second spacer and a third spacer; f3 / EP23 is more than or equal to-18.12 and less than or equal to-15.67; r6 / d3s is greater than or equal to 2.17 and less than or equal to 3.09. The problem that in the prior art, a seven-piece optical imaging lens meets the requirement for small size, and consequently middle stray light is increased is solved.

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, and a lens group and a spacing element group which are arranged in the lens barrel, the lens group sequentially comprises a first lens to a fifth lens from an object side to an image side along an optical axis direction, and the object side surface of a second lens is a concave surface; the spacing element group at least comprises a first spacing element; the first spacing element is positioned between the first lens and the second lens and is in contact with the image side surface part of the first lens; the air interval T12 of the first lens and the second lens on the optical axis and the maximum thickness CP1 of the first interval element meet the following condition: T12 / CP1 is more than or equal to 2.67 and less than or equal to 3.45; the curvature radius R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacing element satisfy the following relation:-2.76 < = R3 / d1m < =-2.14. The optical imaging lens solves the problem that stray light is serious in order to meet the assembly stability requirement in an optical imaging lens in the prior art.

The utility model discloses an optical imaging lens, which comprises a lens barrel assembly, an imaging lens group and a spacer group, and is characterized in that the imaging lens group comprises a first lens group and a second lens group, and the first lens group comprises a first lens, a second lens and a third lens; the second lens group comprises a fourth lens, a fifth lens and a sixth lens; the spacer group comprises a fourth spacer in contact with the image side surface of the fourth lens and a fifth spacer in contact with the image side surface of the fifth lens; the lens barrel assembly comprises a first lens barrel for accommodating the first lens group and a second lens barrel for accommodating the second lens group; the aperture number FNO of the optical imaging lens meets the following formula: FNOlt; 1.6); the distance L between the object side end face of the first lens cone and the image side end face of the second lens cone in the direction of the optical axis and the total effective focal length f of the optical imaging lens meet the following formula: 1.4 lt; l / flt; 1.7, 1.7; the inner diameter d4m of the image side surface of the fourth spacer, the inner diameter d5m of the image side surface of the fifth spacer, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy 14.5 lt; (d5m / d4m) / (N5-N4) lt; 55.2).

The invention provides a folded optical path lens, an optical imaging system and a head-mounted display device. The folded optical path lens comprises: a first lens having a first surface and a second surface arranged oppositely, the first surface being a convex surface; the light splitting film is arranged on the first surface, the difference value between the reflectivity and the transmissivity of the light splitting film is smaller than or equal to 20%, the light splitting film comprises multiple optical coating layers which are arranged in a stacked mode, and the multiple optical coating layers comprise at least one non-metal transparent coating and at least one metal layer. Through the arrangement of the metal layer, the consistency of the transmittance of the folded light path lens to obliquely-incident light component s polarized light and p polarized light can be improved, then the ovality of the folded light path lens is effectively improved, the ovality of the folded light path lens is closer to 1, and then ghosting and stray light of the folded light path lens can be effectively reduced.

The invention provides an optical imaging lens. The optical imaging lens can be used for near-infrared band imaging, the optical imaging lens comprises a lens barrel, a lens group and a spacing element group, and the lens group comprises a first lens, a second lens, a third lens and a fourth lens; the spacing element group comprises a first spacing element and a second spacing element, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis and the distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the extension direction of the optical axis meet the condition that f2 / (CT2 + EP12) is greater than or equal to 1.03 and less than or equal to 2.88; the curvature radius R3 of the object side surface of the second lens and the outer diameter D1m of the image side surface of the first spacing element satisfy the following relation:-1.93 < = R3 / D1m < =-0.41. The optical imaging lens solves the problem of serious stray light caused by improvement of assembly stability of an optical imaging lens in the prior art.

The utility model relates to a heterogeneous bonding optical waveguide sheet, which comprises an optical waveguide layer made of wide bandgap semiconductor materials and a glass substrate made of high refractive index glass, the optical waveguide layer is arranged on the glass substrate, and a grating structure is arranged on the surface, away from the glass substrate, of the optical waveguide layer. The high-refractive-index glass optical waveguide sheet solves the problems that the refractive index of an existing high-refractive-index glass optical waveguide sheet reaches 2.0, stray light is generated through secondary coupling out and the like, and has the advantages of being high in refractive index, large in FOV, full-color in single sheet and capable of reducing rainbow lines.

The invention discloses a visual system which sequentially comprises a first lens group and a second lens group from a first side to a second side along an optical axis, the first lens group comprises a first lens with positive focal power, a reflective polarization element and a quarter-wave plate, and the second lens group comprises a second lens with positive focal power, a partial reflection element and a third lens. The second lens and the third lens are glued; the second lens group is movable along the optical axis to switch the visual system between a first state and a second state. The combined focal length fz of the first lens group and the focal length fm of the system in the first state meet the condition that fz / fm is more than or equal to 5.69 and less than or equal to 8.09; the combined focal length f23 of the second lens and the third lens and the axial distances TDm and TDn from the first side face of the first lens to the second side face of the third lens meet the condition that f23 / (TDm + TDn) is larger than or equal to 1.78 and smaller than or equal to 7.01 when the system is in the first state and the second state respectively. When the system is in the first state, the air interval T12m between the first lens and the second lens and the variable quantity delta f of the effective focal length of the system switched from the first state to the second state meet the condition that T12m / delta f is larger than or equal to 2.00 and smaller than or equal to 4.70.

The invention discloses a copper-silver alloy, a copper-silver alloy plated optical fiber, an optical fiber panel and a preparation method and application of the copper-silver alloy plated optical fiber. The sum of the content of copper and the content of silver in the copper-silver alloy is larger than or equal to 99.995 wt%, and the content of silver ranges from 92 wt% to 95 wt%. The technical problem to be solved is that optical fiber monofilaments plated with copper-silver alloy layers are used for preparing the optical fiber panel, so that the optical crosstalk resistance and the electromagnetic interference resistance of the prepared optical fiber panel are remarkably improved, and high-resolution image transmission of the optical fiber panel with optical crosstalk resistance and high-frequency electromagnetic pulse resistance is realized.

A light emitting diode packaging structure comprises a light emitting element, a first packaging layer and a second packaging layer. The first packaging layer wraps the light emitting element. The first packaging layer has a first refractive index and is provided with a first light emitting surface. The second packaging layer covers the first light emitting surface of the first packaging layer, defines a junction, has a second refractive index and is provided with a second light emitting surface; wherein the second refractive index is greater than the first refractive index; wherein at least one of the first packaging layer and the second packaging layer is provided with a curved surface.

The present disclosure relates to an optical system of a fundus camera with a light barrier, which comprises an illumination device, a first optical assembly, a second optical assembly, an imaging device and a positioning device; the illumination device comprises an illumination light source; the first optical assembly comprises a first half-transmission half-reflection mirror, a first polarizer, a second half-transmission half-reflection mirror and a retinal objective lens, the first optical assembly directs the light beam from the illumination light source to the fundus of the eye to be examined, and guides the reflected light of the fundus to the second optical assembly; the second optical assembly comprises a second polarizer and a focusing module, the focusing module guides the reflected light to the imaging device; the imaging device receives the light from the second optical assembly to form the fundus image; the positioning device comprises a guiding light source and a light barrier, the light beam of the guiding light source has a preset shape after passing through the light barrier, the imaging device acquires the fundus images of different regions of the eye to be examined based on the guiding light source, and the first optical assembly directs the light beam of the guiding light source to the fundus of the eye to be examined for imaging.

The invention provides a dodging module comprising a dodging element and a shading element. The dodging element comprises a light incident surface and an axis perpendicular to the light incident surface. The shading element is arranged on one side of the light incident surface. The shading element comprises a first reflecting part, at least one second reflecting part and a light inlet. The first reflection part surrounds the light inlet. The at least one second reflection part is provided with a first end part and a second end part which are opposite. The first end portion of the at least one second reflection portion is connected to the first reflection portion, and the second end portion of the at least one second reflection portion is farther from the dodging element than the first reflection portion. The light inlet exposes the light inlet surface. The extension direction of the first reflection part is parallel to the light incident surface, and in the direction parallel to the light incident surface, the distance between the second end part of the at least one second reflection part and the axis is smaller than or equal to the distance between the first end part of the at least one second reflection part and the axis. According to the dodging module and the projection device, the energy absorption degree of the optical element in the illumination system can be reduced, the temperature of the optical element is reduced, and the service life is prolonged.

This utility model discloses a reflector cup, including a body with a light outlet at the top and a light inlet at the bottom. Along the direction from the light inlet to the light outlet, a line connecting the two endpoints of the reflective surface curve intersects the curve of the body. The optical structure between the light inlet and the intersection point is a first reflective surface, and the optical structure between the intersection point and the light outlet is a second reflective surface. The first reflective surface at least has the function of adjusting the light emission angle, and the second reflective surface at least has the function of uniformizing the light. This application's design, where the straight line connecting the endpoints of the reflective surface curve intersects the curve of the reflector cup, improves the uniformity and efficiency of the light spot, and alleviates glare. Even when used with lenses, the surface of the lenses can maintain uniform brightness without causing glare, and it also reduces stray light caused by Fresnel reflection from the lenses.

The invention provides a vehicle signal lamp and a vehicle, and the vehicle signal lamp comprises a reflector which is of a sheet-shaped structure which is twisted and extended as a whole; the plurality of light sources are arranged on the light incident side of the reflecting mirror; the light distribution mirror is arranged on the light emitting side of the reflecting mirror; and light rays emitted by the light source are diffused to the light distribution mirror under the action of the reflecting mirror. The light utilization rate can be improved, and the light distribution uniformity is improved.

The invention provides vehicle glass, a vehicle glass assembly and a vehicle, the vehicle glass comprises laminated glass, a first bonding layer and a first glass plate, the first glass plate is connected with the laminated glass through the first bonding layer or arranged in the laminated glass through the first bonding layer, and the first bonding layer is arranged between the first glass plate and the laminated glass. The first glass plate comprises a first signal transmission area and a first shielding area, and the first shielding area is arranged around the first signal transmission area. Therefore, the problems of local optical deformation and distortion of the glass are reduced, and the diopter performance of the vehicle glass in a sensor area is remarkably improved.

The application discloses an optical imaging system, which comprises a lens barrel, an optical lens group and a spacer group arranged in the lens barrel; the optical lens group is sequentially arranged from an object side to an image side along an optical axis and comprises a first lens with optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with optical power and a seventh lens with optical power; the spacer group comprises a first spacer arranged on an image side surface of the first lens and in contact with the image side surface of the first lens; wherein the optical imaging system has seven lenses with optical power; a half of a maximum field of view angle Semi-FOV of the optical imaging system satisfies 60°< Semi-FOV < 80°; an aperture number Fno of the optical imaging system satisfies Fno < 1.8; a total effective focal length f of the optical imaging system, an inner diameter d0s of an object side end surface of the lens barrel and an inner diameter d1s of an object side surface of the first spacer satisfy 0.2 < f / (d0s-d1s) < 0.5.

The invention discloses a PGU backlight system of a vehicle-mounted HUD. The PGU backlight system comprises a shell, a PCB is arranged at the bottom of the shell, an LED lamp is connected to the PCB, a Fresnel cylindrical mirror is arranged at an opening of the shell, a free-form surface lens array is arranged in the shell and located above an LED, and a diffusion film is arranged on the face, facing the LED, of the Fresnel cylindrical mirror; a transverse rod used for cleaning the inner wall of the Fresnel cylindrical mirror and an arc-shaped rod used for cleaning the outer wall of the free-form surface lens array are connected into the shell in a sliding mode, and a tensioning mechanism is arranged between the transverse rod and the arc-shaped rod. The invention provides the PGU backlight system of the vehicle-mounted HUD, which can improve the lighting effect.

The present invention relates to an LED lens, comprising: a transparent substrate, which is a disc-shaped structure, wherein the transparent substrate comprises a light incident surface and a light emitting surface opposite to the light incident surface; and a plurality of lens parts, wherein the plurality of lens parts are arranged on the light incident surface, and a receiving groove is provided at the end of the lens part, wherein the receiving groove can receive LED lamp beads, and the receiving groove is a truncated cone-shaped structure, wherein the diameter of the opening of the receiving groove is larger than the diameter of the bottom of the receiving groove, and wherein a plurality of protrusions are distributed on the bottom of the receiving groove, so that the bottom of the receiving groove is a bead surface structure formed by a plurality of hemispherical surfaces, and the light emitted by the LED lamp beads is emitted through the bottom of the receiving groove and the light emitting surface. The above-mentioned industrial and mining lamp and its LED lens have soft and non-glaring light, uniform illumination, and can reduce stray light, thus meeting people's demand for large diameter and high power LED lamps, and can save costs and improve production efficiency.

The invention relates to the technical field of lenses, and discloses a periscopic light splitting lens module, which comprises a light steering assembly, a light splitting assembly, a direction adjusting assembly and a lens module, and is characterized in that the light splitting assembly is used for split light receiving and emitting red light, green light and blue light to a light inlet surface; the direction adjusting assembly is used for emitting incident light to the light splitting assembly and gathering light emitted by the light emitting face of the light steering assembly to the lens module. The lens module comprises a base, a lens assembly installed in the base, a sensor assembly installed on the base and a circuit board installed outside the base. Through the arrangement of the light splitting assembly, red light, green light and blue light in incident light are respectively absorbed and transmitted to the light steering assembly, so that partial waves are lengthened, and more accurate and abundant image data are provided; after light splitting, the propagation speeds of the same wavelength are consistent, and red light, green light and blue light enter and are transmitted at the same time, so that image quality is guaranteed, stray light is reduced, and an IR sheet is replaced to avoid halo phenomenon, uneven color and the like.

The invention relates to the field of cables, in particular to a spaceflight optical load cable based on a carbon-based material and a preparation method of the spaceflight optical load cable, and the cable sequentially comprises a stranded conductor, a polyimide insulating layer, a graphene shielding layer, a ceramic-based composite material barrier layer, a Teflon outer sheath and a low-reflectivity extinction layer from inside to outside; wherein the stranded conductor comprises a carbon nanotube cable core and a graphite reinforced polymer cable core; the low-reflectivity extinction layer comprises a black oxide material layer and a carbon-based material layer located on the outer side of the black oxide material layer. Uniform pressure is provided for the bonding surface through the atmospheric pressure difference, it is ensured that the high-heat-conduction material is tightly combined with the complex curved surface structure, bubbles are prevented from being generated at the bonding position due to uneven pressure, and the bonding strength and the bonding quality are remarkably improved; meanwhile, the bonding time is effectively shortened, and the bonding efficiency is improved.

The utility model relates to an anti-interference light safety grating, and relates to the technical field of safety gratings, the anti-interference light safety grating comprises a safety grating body, one side of the safety grating body is provided with a protective shell, the protective shell is provided with an installation area and a shielding area, and the safety grating body is installed in the installation area; a shielding assembly is arranged on the side, close to the shielding area, of the protective shell and shields interference light. According to the invention, the light influence of the safety grating body caused by natural interference or other interference can be reduced, and the risk of false alarm or false alarm is reduced.

The embodiment of the invention discloses a laser radar and a mobile device, the laser radar comprises a laser emission module, a laser receiving module and a light extinction structure, the light extinction structure comprises at least one of a first light extinction device and a second light extinction device, the first light extinction device is provided with a first light through hole, one first light through hole corresponds to one laser emission unit, and the second light extinction device is provided with a second light through hole. At least part of detection light formed by each laser transmitter in a laser transmitting unit can pass through the light guide plate; the second light eliminator is provided with a second light through hole, and one second light through hole corresponds to one laser receiving unit and is used for enabling at least part of the echo light correspondingly received by each laser receiver in the laser receiving unit to pass through. The first extinction device and the second extinction device can reduce and even eliminate stray light on light passing paths of detection light and echo light in a multi-channel radar system, so that the laser radar has a cleaner point cloud form, recognition of a target object is more accurate, and anti-interference performance to a complex environment is higher.

The embodiment of the invention discloses a double-light-source three-channel single-particle biological aerosol detection system. Comprising a first light source assembly used for forming first ultraviolet light; the second light source assembly is used for forming second ultraviolet light; the first dichroscope component is used for transmitting the first ultraviolet light and the second ultraviolet light in the same direction; the first plano-convex lens component is used for focusing the first ultraviolet light and the second ultraviolet light; the light collecting assembly is used for collecting scattered light and fluorescent light of the first ultraviolet light and the second ultraviolet light and outputting the scattered light and the fluorescent light; the second plano-convex lens component is used for enabling the light output from the light collecting component to form collimated light; the second dichroscope component is used for splitting the collimated light formed by the second plano-convex lens component; the first detection assembly is used for detecting reflected light of the second dichroscope; the third dichroscope component is used for splitting the transmission light of the second dichroscope; the second detection assembly is used for detecting reflected light of the third dichroscope; and the third detection assembly is used for detecting transmission light of the third dichroscope.

The utility model relates to optical technology field discloses a periscope camera module, including the base with the installation cavity in the inside, the anti shake motor of installing on the base, the lens of installing on the anti shake motor and facing the installation cavity, the imaging component of installing on the base and the turning optical element, and light is along the light entrance direction from the lens and is along the light exit direction to the imaging component after shooting to the turning optical element, the lens has the light exit side to the side of the turning optical element, and the light exit side protrudes the shielding protruding portion for shielding stray light to the side of the turning optical element, the utility model discloses protrude shielding protruding portion on the lens to shield the gap between the lens and the turning optical element, thereby can make the effective light to the turning optical element, and as far as possible reduce stray light, reduce the formation of stray light, optimize the light effect, and simultaneously, the shielding protruding portion of suspension can guarantee that the shielding protruding portion does not hinder the movement of the lens, guarantees the completion of anti shake and automatic focusing.

The invention relates to a convex high-reflection concave low-reflection color blindness correction lens and a preparation method thereof. It solves the problems of limited design freedom, excessive number of film layers and stress in the prior art. It comprises a transparent lens substrate, a high-reflection film layer formed on the convex surface and a high-transmission film layer formed on the concave surface. The convex high-reflection film layer adopts a multilayer composite structure of silver and silicon dioxide, and through accurate control of the thickness of the silver layer and the matching of the dielectric layer, selective reflection and attenuation of specific color light are realized; the concave high-transmission film layer adopts a multilayer dielectric interference film system design of titanium dioxide and silicon dioxide, realizing accurate transmission and spectral shaping of each waveband. The advantages of the invention are: breaking through the design limitations of traditional single-sided coating, adopting a double-sided asymmetric film system synergistic control strategy, realizing higher spectral selectivity, lower stray light, more natural lens appearance and standardized production of eight types of clinical prescriptions.

This invention provides a split-type cold screen for an infrared detector and its assembly method. The split-type cold screen for the infrared detector includes a cold screen body and matte fins. The assembly method includes: applying a black coating to both the cold screen body and the matte fins, pre-baking them, then initially assembling the pre-baked cold screen body and the matte fins, and finally baking the pre-assembled cold screen to complete the assembly. This invention places the cold screen assembly step after pre-baking and before baking, using the bonding force of the black coating to connect the cold screen body and the matte fins. This eliminates the adhesive bonding step in the split-type cold screen assembly process, solving the problem of using adhesives to bond the cold screen body and matte fins in the split-type cold screen assembly process. This ensures good mechanical reliability of the cold screen assembly in low-temperature vibration environments and also improves the performance of the detector components and the efficiency of the cold screen assembly process.

The utility model relates to the technical field of lighting lamps, and particularly discloses a dual anti-dazzle down lamp which comprises a down lamp body, an outer cover is sleeved on the outer side of the down lamp body, an LED light source and a reflection cup are sequentially arranged on the inner side of the outer cover from inside to outside, a light-emitting opening is formed in the front end of the reflection cup, and the light-emitting opening is communicated with the outer cover. An LED light source is arranged in the reflecting cup, a light-emitting opening is formed in the reflecting cup, an acrylic mask is arranged on the inner side of the reflecting cup, light emitted by the LED light source irradiates towards the acrylic mask, a frosted face is arranged on the acrylic mask, and the distance between the acrylic mask and the light-emitting opening ranges from 15 mm to 25 mm. The frosted face is arranged on the acrylic mask, so that light is fuller and more uniform, light is soft, dazzling is prevented, the shading angle is enlarged by increasing the distance between the light source and the light-emitting opening, stray light is reduced, dazzling prevention and visual fatigue prevention are further achieved, the overall structure is simple, production cost is low, and the application range is wide.

The invention relates to the technical field of head-up displays, in particular to a reflecting part, a head-up display system and a vehicle. The reflecting part comprises a substrate, a transflective film and a first antireflection film, the reflectivity of the transflective film to first polarized light is larger than that of the transflective film to second polarized light, the first antireflection film is located on one side of the substrate, the transflective film is located in the substrate, or the transflective film is located on the other side of the substrate, and the first antireflection film is located in the substrate. Or the transflective film is located between the first antireflection film and the substrate. By arranging the transflective film, when the light is reflected, the reflectivity for the first polarized light is greater than the reflectivity for the second polarized light, so that when the image light of the image source is the first polarized light, the reflectivity for the first polarized light can be improved, and the display effect and the display brightness of the image are improved. And by arranging the first antireflection film, the light transmission amount of the reflecting piece is increased, and the imaging definition is further improved.

The present invention provides a Fizeau interferometer and an interference measurement system, which relate to the field of laser coherence technology. The Fizeau interferometer comprises a laser, a polarization beam splitter prism, a collimator, a reference mirror and a test mirror arranged in sequence along the propagation direction of light, and also comprises an imaging system; a quarter wave plate is arranged between the polarization beam splitter prism and the reference mirror, and the quarter wave plate is arranged at an angle. The Fizeau interferometer adopts a polarization beam splitter prism and a quarter wave plate, the polarization beam splitter prism has the ability to cut off P polarized light / S polarized light, can eliminate stray light generated by the beam splitter prism itself, and the inclined setting of the quarter wave plate can reduce the stray light generated by the quarter wave plate itself, so the Fizeau interferometer reduces the influence of stray light.

The present invention provides an AlGaInP-based epitaxial wafer, a preparation method and an LED. The epitaxial wafer comprises, from bottom to top, a substrate, an intermediate layer, an N-type semiconductor layer, an active layer and a P-type semiconductor layer. The N-type semiconductor layer comprises a resonant potential well layer arranged close to the active layer. The resonant potential well layer comprises a potential well sublayer and a potential barrier sublayer arranged at both ends of the potential well sublayer. The potential barrier sublayer is a non-doped AlGaInP sublayer. The potential well sublayer comprises (AlGaInP) sublayers arranged periodically and alternately from bottom to top. x Ga 1‑x ) 0.5 In 0.5 P first sublayer and (Al Y Ga 1‑Y ) 0.5 In 0.5 P second sublayer, the (Al x Ga 1‑x ) 0.5 In 0.5 The bandgap width of the first sublayer of P gradually decreases from bottom to top. Y Ga 1‑Y ) 0.5 In 0.5 The potential barrier of the second sublayer of P is higher than (Al x Ga 1‑x ) 0.5 In 0.5 The potential barrier of the first sublayer of P can cause resonance between the multiple wells, capture more electrons, increase the lateral expansion rate of electrons, reduce the electron movement speed, and reduce the risk of epitaxial wafer breakdown.

The utility model relates to a periscopic module base capable of reducing stray light interference. The periscopic module base comprises a base, an accommodating space is formed in the base; the base comprises a base metal plate and a base main body which is injected on the base metal plate through an embedding injection molding process; an anti-reflection layer positioned in the accommodating space is arranged on the first plane of the base metal plate; the base metal plate is blackened, namely the anti-reflection layer is arranged, the light refractive index is reduced, and the purpose of reducing stray light is achieved. Meanwhile, the anti-reflection layer is thin, so that the space can be saved, and the occupation of the accommodating space is avoided; furthermore, compared with the traditional black mylar film pasting process, the production process provided by the anti-reflection layer has the advantage that the manual film pasting cost is more saved; and the connection between the base metal plate and the base main body is more stable, so that the size of the accommodating space is effectively ensured under the condition of ensuring the structural strength.