111results about How to "Meet miniaturization needs" patented technology

The invention relates to a smoke washing device. A washing tower of the smoke washing device comprises a cooling adsorption washing area and an adverse current adsorption washing area. When smoke passes through the cooling adsorption washing area, partial pollutant such as smoke dust in the smoke can be removed, volume flow rate of the smoke is reduced simultaneously, and sectional area of the adverse current adsorption washing area is favorably reduced. In the adverse current adsorption washing area, the smoke dust in the smoke can be absorbed through sufficient contact between the smoke dust and a liquid film, and simultaneously pollutant such as sulfur dioxide can be sufficiently reacted. By means of the smoke washing device, high-efficient smoke dedusting desulfuration is achieved. In addition, washed smoke and heated air are mixed and then discharged out, smoke humidity is reduced, and rime fog at an air outlet of the smoke washing device is avoided. The smoke washing device is small in size, light in weight and applicable to flue gas treatment of a host machine and a boiler of an offshore platform or a traveling ship, and meets miniaturization requirements of on-land fume treatment equipment.

The invention relates to the technical field of signal card connection, in particular to a side-by-side card base. The side-by-side card base comprises a shell and a plastic body, wherein the plastic body is provided with a plurality of conducting terminals, and a card containing space is formed between the plastic body and the outer shell. The side-by-side card base further comprises a card cover which can be inserted in the card containing space and pulled out of the card containing space, wherein the card cover is provided with a first SIM card area, a second SIM card area and an SD card area, the first SIM card area and the second SIM card area are used for containing SIM cards, the SD card area is used for containing an SD card, and the second SIM card area and the SD card area coincide partially. A card retreating device capable of popping out the card cover is further arranged in the card containing space. The side-by-side card base is provided with the first SIM card area, the second SIM card area and the SD card area, thereby being capable of meeting the requirement for storage of two cards; two SIM cards or one SIM card and one SD card can installed in the card cover, as a result, the two cards can be inserted or pulled out simultaneously, and operation is convenient; due to the fact that the two cards can be pulled out only through the same card retreating device, the size of the card base is reduced, the structure is simple, and the demand for miniaturization of the card base is met.

The invention discloses an optical fiber automatic guiding control device suitable for an optical fiber ring winding machine. According to the optical fiber automatic guiding control device suitable for the optical fiber ring winding machine, an elastic guiding rod is adopted to serve as a front end sensitive device, a fiber arranging auxiliary lateral force is provided for an optical fiber in a winding process, and an optimal lateral force value obtained through related experiments serves as a reference value. The optical fiber automatic guiding control device enables the auxiliary lateral force to keep the constant optimal value all the time by highly dynamically detecting the auxiliary lateral force and performing closed-loop compensation control, thereby guaranteeing that the optical fiber can be precisely wound on a reserved optical fiber ring. The optical fiber automatic guiding control device suitable for the optical fiber ring winding machine eliminates a rollback idle stroke and mechanical friction in a transmission process, can obtain a high displacement resolution ratio, achieves intelligent optical fiber precise winding by adopting automatic guiding and real-time compensation closed-loop control, and improves the ring winding quality of the optical fiber ring winding machine.

The application provides a camera lens, a camera module, and a terminal. The camera lens includes a first lens, a diffractive optical element, and a lens module along an optical axis from the object surface to the image surface; the surface of the first lens facing the object surface is a convex surface at the optical axis, and the surface facing the image surface is a concave surface, having a positive focal power; the diffractive optical element has a positive focal power and includes a surface facing the object surface, a surface facing the image surface, and a diffractive surface between the two surfaces, the surface facing the object surface is a convex surface at the optical axis, and the surface facing the image surface is a concave surface at the optical axis; the lens module includes N lenses, at least one of the surface facing the object surface and the surface facing the image surface of each of the N lenses is an aspheric surface, and the lens module has a positive focal power. The camera lens provided by the application can meet the requirements of miniaturization and high image quality, and meet the demand for size increase of the image sensor.

The invention discloses a large-aperture ultra-wide-angel optical lens. The large-aperture ultra-wide-angel optical lens comprises a lens cylinder and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are coaxially arranged sequentially along the object space to the image space inside the lens cylinder; the first lens, the second lens, the third lens and the eighth lens are negative focal power spherical lenses; the fourth lens, the fifth lens, the sixth lens and the seventh lens are positive focal power spherical lenses. According to the large-aperture ultra-wide-angel optical lens, the lenses are arranged in specific curvature radiuses, thicknesses and intervals, then the viewing angle theta which is large can achieve 170 degrees, the aperture can achieve F2.0, the resolution is high, and accordingly the large-aperture ultra-wide-angel optical lens satisfies a high definition quality requirement, has a larger viewing angle and is particularly applicable to a high definition photosensitive product with the resolution being matched with a 16 million pixel chip, the high definition photosensitive product comprises an exercise DV (Digital Video), home security and protection, an automobile data recorder and the like.

The invention provides a continuous-operation anaerobic device integrated with small-size gas producing, gas collecting and deslagging functions according to medium / high temperature anaerobic digestion principle. The device is composed of a feed inlet, a tank, a heating device, an insulating layer, an observation holes, a stirring device, an online detection device, an exhaust hole, a discharge hole and a methane collector. Raw materials of the device can be organic waste materials of agriculture waste, poultry excrement, sludge, landscape and greening waste, urban kitchen waste and the like, and the maximum methane production of 450ml / g TS can be realized; the anaerobic device has the advantages of good fermentation effect due to unique design and simpleness in operation.

The invention provides a method for manufacturing an embedded electronic circuit three-dimensional assembly substrate, which can be used for increasing the interconnection assembling density and supplementing technical cryptosecurity for the three-dimensional assembly substrate. According to the technical scheme, the method is implemented by the following steps of: in the manufacturing process of a printed board, setting a planar printed board as an embedded substrate, and designing a cavity of which the area and height are matched with the size, height and printed board thickness of a layout device; assembling a device to be embedded on the bottom surface of the cavity in a surface mounting way, or directly laminating and burying into a designed and planed cavity position of the printed board, laminating, connecting a printed lead in the printed board with a device outside the substrate, and covering a printed board substrate with a certain thickness above and below the buried device; and after laminating the printed board, perforating at the pin position of the buried device, performing hole metallization through a buried blind via technique, surface device mounting and through hole insertion to realize interconnection so as to form a three-dimensional laminated assembly structure in which the embedded substrate is taken as a carrier.

The invention discloses an imaging system and an electronic device. The imaging system includes a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power and a sixth lens with negative refractive power, in order from the object side to the image side of an optical axis, wherein the object side surface of the first lens is a convex surface; the object side surface of the fifth lens is a concave surface at the circumference; the image side surface of the fifth lens is a convex surface; the image side surface of the sixth lens is a concave surface at the optical axis; the image side surface of the sixth lens is a convex surface at the circumference; andat least one of the object side surface and the image side surface of the sixth lens includes at least one inflexion point. For the imaging system and the electronic device, through the above-mentioned reasonable lens configuration of six lenses, the imaging system not only has a good resolution to meet the high resolution requirement, but also can reduce the height of the imaging system to meet the demand for miniaturization.

The invention discloses a small differential notch UWB-MIMO antenna, which comprises a dielectric substrate, a floor board arranged at the top layer of the dielectric substrate and four antenna units, wherein the four antenna units are separated through a pair of diagonal lines of the top layer of the dielectric substrate and a pair of diagonal lines of the bottom layer of the dielectric substrate; four slots which are symmetrical mutually are etched on the pair of diagonal lines of the top layer of the dielectric substrate by the floor board; the four antenna units are separated by the four slots; each antenna unit comprises a T-shaped slot etched in the floor board and a differential feeder structure arranged on the bottom layer of the dielectric substrate, and the T-shaped slot is internally provided with a resonance branch. The UWB-MIMO antenna has the advantages of small size, wide frequency band, good radiation pattern and the like, and can meet requirements of miniaturization, low cost, easy processing, easy integration with a differential circuit and no interference with other systems.

The embodiment of the invention discloses an electronic device. The electronic device at least includes a body and connecting pieces, the connecting pieces comprise rotating shafts, the electronic device further comprises antenna which are arranged in the connecting pieces and used for producing resonances on at least one frequency band; the rotating shafts are connected with the antenna to produce resonances on at least one frequency band, and generate rotations so that the body assumes a different use posture; a first property of the connecting pieces is obtained at least through the first property of the antenna, and the first property is characterized as a dimension. According to the electronic device, the space occupation of antenna can be reduced on the basis of ensuring the radiation capability of antenna, and the miniaturization demand of electronic devices is met.

The invention belongs to the field of experimental equipment for the dynamic fracture toughness of a testing material and particularly relates to a three-point bending testing system based on the dynamic fracture toughness of the testing material. The system comprises a pedestal, wherein a support device, a loading rod, a knock rod, a compressed gas gun and a signal acquiring-processing device, a guide rail portion is arranged on the pedestal, and all the components are arranged on the guide rail portion and are fixedly connected and matched with the guide rail portion in a reciprocating guiding manner; the support device comprises a vertical plate which forms a matching portion matched with the guide rail portion, and grooves or through holes penetrating through a plate body are formed in the vertical plate; the support device further comprises a lining plate, and a through hole portion for being penetrated by the loading rod is arranged on the lining plate; lining units are further distributed on the lining plate; the supporting direction of the lining units, relative to a testing sample is opposite to the force applying direction of the loading rod. According to the system, the uniformity of acquired overall data can be guaranteed when the requirements of easiness in detaching and maintaining of a device are effectively realized.

A tube-shaped solid polymer fuel cell is provided with communicating fuel gas channels 2 on the periphery of a bar-shaped current collector 1 and along the axis of the bar-shaped current collector 1 and the membrane-electrode assembly (MEA) 6 on the outside of the bar-shaped current collector 1 and the fuel gas channels 2 and has a structure in which a fuel gas flows through the fuel gas channels 2 and an oxide gas flows outside the membrane-electrode assembly (MEA) 6, wherein some or all of the fuel gas channels 2 are filled with a porous material having communication pores along the axis thereof and a conductive particulate having resistance to corrosion is mixed in with the porous material. The tube-shaped solid polymer fuel cell of the present invention makes it possible to improve gas flowability at the time of production of catalyst layers while avoiding infiltration of the gas channels by a catalyst ink so as to block the channels and thus lower cell resistance at the time of fuel cell operation. Thus, power generation performance is improved by the present invention.

The invention provides a double frequency antenna, which is used for receiving and sending electromagnetic wave signals. The double frequency antenna comprises an antenna body, a feed-in terminal and an earth terminal, wherein the antenna body comprises a matching part, a high frequency part and a low frequency part which are arranged in the same plane, the matching part is used for regulating impedance matching of the double frequency antenna and comprises a first connecting end and a second connecting end, the high frequency part is connected with the first connecting end of the matching part, a first groove is arranged between the high frequency part and the matching part, the low frequency part is connected with the second connecting end of the matching part, a second groove is arranged among the low frequency part, the matching part and the high frequency part, and the feed-in terminal and the earth terminal are both arranged on the matching part.

The invention discloses a graphene-based circularly-polarized intake antenna for a capsule endoscope device. The material of each radiation unit and floor of the antenna is a copper-coated graphene film, and the material of the copper-coated graphene film has relatively high carrier density, so that the working bandwidth and gain of the intake antenna can be increased. A graphene double-S combinedstructure radiation patch (4) and a graphene double-S combined structure radiation patch (5) are connected through four short-circuit probes to form a composite spiral structure, so that the circularpolarization characteristic is generated, and the bit error rate is reduced while multipath interference is suppressed. The hook-shaped combined structure of a graphene hook-shaped combined structureradiation patch can reduce the resonant frequency of the antenna and increase the impedance bandwidth of the antenna. The size of the antenna is only Pi*(4.5)<2>mm<3>, and the antenna has the characteristics of wide frequency band, circular polarization, interference resistance, good electromagnetic compatibility, small size and the like. The antenna is suitable for an ISM2.4GHz frequency band, and can meet the working requirements after the complex environment is ingested.

The invention discloses a half mode substrate integrated waveguide duplexer. The half mode substrate integrated waveguide duplexer comprises a dielectric plate layer, and also comprises an upper metal coating layer on the front surface of the dielectric plate layer and a lower metal platting layer on the back surface of the dielectric plate layer, wherein an input port and two output ports are formed in the upper metal coating layer; the input and output ports are in direct coupled feeding by adopting 50-<omega> microstrip lines; and grounding metal through holes are formed in the upper metal coating layer. The duplexer adopts the HMSIW (half mode substrate integrated waveguide) structure, so that the duplexer is easy to integrate; meanwhile, the duplexer has the characteristics of large power capacity, high Q, low loss, high applicable frequency, and the like; and compared with the common SIW structure, the size of the HMSIW is reduced by about half, so that the size of the duplexer is greatly reduced.

Disclosed in the invention is an eight-lens-sheet wide-angle camera lens unit comprising a lens barrel, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The lenses are arranged coaxially successively in the lens barrel from the object space to the image space; the first lens, the second lens, the third lens, and fifth lens are spherical lenses with negative powers; and the fourth lens, the sixth lens, the seventh lens, and the eighth lens are spherical lenses with positive powers. Because all lenses with specific curvature radiuses and thicknesses are arranged at specific intervals, the visual angle theta of the lens unit is large and can reach 190 degrees, the aperture can reach 1.8 and the resolution is high, so that the requirement of the high-definition quality can be met and the larger visual angle can be realized. Therefore, the camera lens unit is suitable for large-range monitoring and especially suitable for a high-definition light-sensitive product having the resolution with a 16-megapixel chip, wherein the product can be a movement DV, a household security and protection unit, or an automobile data recorder and the like.

The invention belongs to the field of experiment equipment for testing the dynamic fracture toughness of a test material, and in particular relates to a three-point bending supporting device based on the dynamic fracture toughness of a test material. The device comprises a base plate and a vertical plate, wherein the base plate and an external support are detachably matched with each other; a groove or a through hole penetrating through a vertical plate body is formed in the vertical plate and is positioned at a loading rod traveling path. The device further comprises a lining plate which is arranged on the base plate, is parallel to the plate surface of the vertical plate and is arranged at the other end, which is opposite to the collision direction of a loading rod, of the vertical plate; a through hole part, through which the loading rod passes, is formed in the lining plate; a lining pad unit for holding a test sample to be tested is also arranged on the lining plate; the supporting direction, which is relative to the test sample to be tested, of the lining pad unit is opposite to the loading rod force application direction. The device is high in standardization degree, can effectively meet requirements on easy detaching and easy maintenance, and can also guarantee the uniformity of whole data acquisition so as to work reliably and stably.

The invention relates to a cavity filter, which comprises a cavity with one end open, a cover plate installed at the open end of the cavity, a first resonant cavity and a second resonant cavity arranged in the cavity, a partition wall positioned between the first resonant cavity and the second resonant cavity, a cross coupling structure, and a debugging coupling screw installed on the cover plate.A first coupling resonant column is arranged in the first resonant cavity. A second coupling resonant column is arranged in the second resonant cavity. The cross coupling structure comprises a firstcoupling piece formed on the first coupling resonant column and a second coupling piece formed on the second coupling resonant column. The partition wall is provided with a groove. The first couplingpiece and the second coupling piece are oppositely arranged and located on the two sides of the groove respectively, and the tail end of the first coupling piece and the tail end of the second coupling piece are close to the groove. The debugging coupling screw penetrates through the cover plate and extends into the groove. According to the invention, the strength of the transmission zero can be conveniently debugged without dismounting the cover plate, and the adjustable range is large.

The invention relates to a digital pathologic imaging device, and belongs to the technical field of optical imaging. The digital pathologic imaging device comprises a microscopic illumination device, a microscopic object lens and a digital image sensor; the microscopic illumination device comprises a light source, a Mie scattering device, an optical cavity and a condenser; the light source is positioned in one side of the Mie scattering device, the condenser is positioned in the other side of the Mie scattering device, and the light source emits light to irradiate the Mie scattering device; the Mie scattering device is used to scatter and radiate the light from the light source onto the condenser; the condenser focuses and outputs the light input from the Mie scattering device to a tested object; the microscopic illumination device comprises first and second lenses arranged along the optical axis direction, and the first lens is used to receive light from the tested object; the front surface of the first lens and the back surface of the second lens are plated with semi-transmitting semi-reflecting optical dielectric light splitting films respectively; and the digital image sensor receives light from the second lens and carries out digital imaging.

The invention discloses a pan-tilt motor shaft rotating frame angle obtaining method and device, a storage medium, electronic equipment and an unmanned aerial vehicle. The pan-tilt motor shaft rotating frame angle obtaining method comprises the steps that S1, installing a first inertia attitude information obtaining unit at the motor stator end, and installing a second inertia attitude informationobtaining unit at the motor rotor end; S2, respectively and correspondingly calculating a first attitude angle theta 1 and a second attitude angle theta 2 of the first inertial attitude information obtaining unit and the second inertial attitude information obtaining unit along the radial direction of the motor rotating shaft according to an attitude calculation algorithm; and S3, calculating theabsolute value |theta| of the angle of a rotating frame of a motor shaft according to the first attitude angle theta 1 and the second attitude angle theta 2. The IMU sensors are installed at the stator end and the rotor end of the motor respectively for algorithm operation, so that the frame angle of the motor rotating shaft can be obtained without installing an angle measurement sensor on the motor rotating shaft, and the pan-tilt miniaturization requirement is met.

The invention discloses an optical lens, a camera module and electronic equipment, and the optical lens comprises a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, the object side surface and the image side surface of the second lens are respectively a convex surface and a concave surface; a third lens element with negative refractive power having a concave image-side surface; the object side surface and the image side surface of the fourth lens are convex surfaces; the object side surface and the image side surface of the fifth lens are respectively a concave surface and a convex surface; the object side surface and the image side surface of the sixth lens are concave surfaces; a seventh lens element with refractive power having a concave object-side surface; the image side surface of the eighth lens is a convex surface; the object side surface and the image side surface of the ninth lens are respectively a convex surface and a concave surface; the optical lens satisfies 0.3 lt; sD < 12 > / IMGHlt; and 0.5. With the adoption of the scheme, while the imaging quality is ensured, the optical system has the characteristics of miniaturization and large field angle.

The invention provides a pit embedded circuit board three-dimensional assembling method, which has the advantages of being capable of obviously improving the three-dimensional assembling density of electronic products, reducing the size and the weight and realizing time sequence consistency of transmitting signals of paired used devices. The invention is realized in the following technical scheme that sunken pits for assembling components are designed and manufactured on a printed board, and the selected thin and small components are deployed in the sunken pits of the printed board; appropriate bridging devices are deployed right above the pits to form a pit-type device lamination three-dimensional assembled structural form; wiring in the printed board is carried out according to the circuit design, electrical signal transmission channels are laid among the devices, and are connected with the devices inside and outside the sunken parts through printed conductors on the printed board; patching is carried out on the components on the surface of the printed board (comprising the surfaces of the pits), and device bonding pads are arranged inside and outside the sunken pits and solder paste is coated on the bonding pads according to the device bonding pad design; and the printed board plastered with the components is subjected to reflow soldering, thereby finishing the three-dimensional assembling of the printed board.

The invention discloses a heavy-current high-frequency plane inductor and a making method thereof. The heavy-current high-frequency plane inductor comprises a coil and a magnetic core arranged at the outer part of the coil, wherein an insulation sheet is arranged between the coil and the magnetic core. According to the heavy-current high-frequency plane inductor and the making method thereof, by adopting a plane magnetic core with an E type section, and no conventional winding framework exists, the magnetic core and the coil are directly insulated and fixed through plugging the insulation sheet; the coil is formed by welding a single-turn coil through silver welding, thus the mechanical strength of the coil is ensured, and the impaction of a heavy current is met; each turn of coil can be processed into a thinner and larger plane, thus the flattening of the coil is ensured, the heat radiation area of the magnetic core and the surface of the coil is increased, and the efficiency of the inductor is increased; the inductor is capable of meeting the miniaturization demand.

Provided are an image sensor module and a camera module including the same. The image sensor module includes a printed circuit board having accommodation space for insertion of an image sensor; a bonding material continuously covering the image sensor and the printed circuit board; and an infrared ray (IR) filter bonded to the image sensor through a bonding material. A gap is formed between the IR filter and the image sensor, so the image sensor module meets the miniaturization requirement and has improved stiffness.

The invention provides a photosensitive module. The photosensitive module comprises: a photosensitive chip having a first surface having a photosensitive region, a second surface back to the first surface and a liner; electronic elements arranged around the photosensitive chip; molding portions arranged around the photosensitive chip and combined with the photosensitive chip; and a first re-wiringlayer covering at least part of the surface of the photosensitive chip and at least part of the surface of the molding portion, wherein the liner is electrically connected with the first re-wiring layer through the electronic elements. The present invention further provides a corresponding manufacturing method of a photosensitive module. The circuit board can be cancelled to meet the mini-type demand; the yield and the product quality can be improved; the bonding of the silicon glass forms protection for the photosensitive chip, and glass having the protection effect can replace a traditionalcolor filter piece so as to further reduce the size of the photosensitive module or a camera module.

The present invention relates to the technical field of medical devices and discloses an outdoor intelligent electrocardiogram monitoring system and a working method thereof. An MCU circuit unit, a wireless circuit unit, a storage circuit unit and an analog-to-digital conversion circuit unit and at least one pair of electrocardiosignal connection ends are built into an electrocardiogram chest paste terminal, automatic collection and local recording of digital electrocardiogram data are realized, existing algorithm runs to diagnose whether abnormal electrocardiogram exists, if the abnormal electrocardiogram is diagnosed, diagnosis results and corresponding abnormal electrocardiogram data are sent wirelessly to a communication base station. Besides, the diagnostic results and corresponding abnormal electrocardiogram data can be transferred and uploaded to a back-end server through the communication base station, then the back-end server generates an alarm message and the alarm message istransmitted to a medical care terminal in a nearby region of the communication base station. Thus, the outdoor intelligent electrocardiogram monitoring system can notify professional medical staff intime for emergency treatment in case of emergency and is especially suitable for outdoor scenes such as physical examination, training, military training and the like.

The invention discloses a cutting and feeding device. The device comprises a fixedly arranged feeding rack, a blanking and cutting mechanism and a cutting and bearing mechanism, wherein a material belt guide plate is arranged on the feeding rack, and a material belt conveying guide rail is arranged on the material belt guide plate; the blanking and cutting mechanism is arranged on the feeding rack; the cutting and bearing mechanism is arranged on the feeding rack and positioned below the blanking and cutting mechanism; a blanking bearing platform located downstream of the material belt conveying guide rail is fixedly arranged on the feeding rack, a cutting station and a transfer station are arranged on the feeding rack in the conveying direction of the material belt sequentially, and a bearing assembly is driven by a transfer driver to be reciprocally switched between a cutting station and a transfer station. According to the device, integrated and efficient matching of cutting-transfer-feeding can be achieved, and cutting accuracy and feeding efficiency of workpieces are finally improved.

The invention relates to the field of robots, and provides a robot, a mechanical arm, a joint and a harmonic reducer device of the joint. The harmonic reducer device comprise a cup-shaped flexible gear, a rigid gear meshed with the flexible gear and a wave generator, wherein the wave generator comprises a sleeve for power input and a wave generator body which is arranged on the sleeve and enables the flexible gear to generate radial deformation under rotation of the sleeve so as to change the meshing position of the flexible gear and the rigid gear, the harmonic reducer device further comprises an end cover and an output bearing which are oppositely arranged, the harmonic reducer device further comprises a first stopping structure and a second stopping structure which are used for stopping the sleeve, and the projection of the power output end of the wave generator and the projection of the second stopping structure on the axis of the sleeve are at least partially overlapped. The projection of the power output end of the wave generator and the projection of the second stopping structure on the axis of the sleeve are at least partially overlapped by breaking through conventions, the requirement for miniaturization of the harmonic reducer device is met by directly changing the axial size of the harmonic reducer device under the condition that the radial size of the rigid gear is not changed, and market requirements are met.

The invention discloses a large-visual field high-performance ultra-small microscope objective lens. The large-visual field high-performance ultra-small microscope objective lens is a catadioptric optical system, and comprises a first lens and a second lens sequentially along an optical axis direction, wherein both the first lens and the second lens are meniscus lenses, the surface facing an object surface is a concave surface, the surface facing an image surface is a convex surface, the object surface-facing surface of the first lens is a front surface, the image surface-facing surface of thesecond lens is a rear surface, and both surfaces are coated with half transparent and half reflecting optical medium spectrophotometric films; an aperture diaphragm is located on the rear surface facing the image surface of the first lens; the front end, located on the front surface of the first lens, of the object surface has a far limiting position; and the rear end, located on the rear surfaceof the second lens, of the image surface has a far limiting position. By adopting the catadioptric structure, the maximum diffraction path of light in the system is realized concisely, and the diffraction limit is reached. One embodiment of the invention realizes that the diameter of the visual field range is 1 mm, the numerical aperture is 0.6, the total system length is 4.23 mm, the magnification is 5.14, and the imaging resolution is 0.24 microns / pixel.