Abstract: A method for determining the pore size and pore size distribution of a filtration membrane comprises: selecting a group of fluorescent pellets having different diameters and emission wavelengths as a reference; plotting the standard curve between the concentration and fluorescence intensity for each fluorescent pellet at its emission wavelength; uniformly dispensing a group of fluorescent pellets as a reference substance in water to prepare a mixed suspension of which the mass concentration of each fluorescent pellet; using the filter membrane to be tested to perform one-time filtration on the mixed suspension prepared, then performing fluorescence detection on the obtained filtrate, calculating the concentration of each fluorescent pellet in the filtrate the retention rate of the filtration membrane to be tested for each fluorescent pellet; and calculating the pore size and pore size distribution of the filter membrane to be tested accordingly.

Abstract: This application relates to a battery management system and a power supply device. The battery management system includes a first battery management module and a second battery management module in communication connection with the first battery management module. The second battery management module includes a code detection circuit that includes a plurality of sampling channels. The first battery management module is configured to determine code data based on voltage of at least one of the sampling channels, and perform identity authentication on the second battery management module based on the code data. The code detection circuit is disposed in the second battery management module, and code data is determined based on voltage of the sampling channel in the code detection circuit, so that failure in any battery management module does not affect code data collection by other battery management modules, thus achieving a high management reliability.

Abstract: The present disclosure provides an OLED light source drive control circuit and an OLED lamp. The drive control circuit includes a DC/DC constant voltage module, an external transceiver, a first internal transceiver, a microcontroller unit, a linear constant current module, and an OLED panel and a light source. The microcontroller unit communicates with the first internal transceiver, feeds back the detected output voltage to the DC/DC constant voltage module, and controls the DC/DC constant voltage module to operate. The first internal transceiver is connected with the linear constant current module through a differential bus. The linear constant current module includes a plurality of linear constant current driver ICs, each contains a second internal transceiver, and a differential bus interface of the second internal transceiver is respectively connected with a differential bus communication line connecting with a differential bus interface of the first internal transceiver.

Abstract: The present disclosure provides an OLED light source drive control circuit and an OLED lamp. The drive control circuit includes a DC/DC constant voltage module, an external transceiver, a first internal transceiver, a microcontroller unit, a linear constant current module, and an OLED panel and a light source. The microcontroller unit communicates with the first internal transceiver, feeds back the detected output voltage to the DC/DC constant voltage module, and controls the DC/DC constant voltage module to operate. The first internal transceiver is connected with the linear constant current module through a differential bus. The linear constant current module includes a plurality of linear constant current driver ICs, each contains a second internal transceiver, and a differential bus interface of the second internal transceiver is respectively connected with a differential bus communication line connecting with a differential bus interface of the first internal transceiver.

Abstract: A reconnaissance objective lens used for an unmanned aircraft, the reconnaissance objective lens comprising a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4) and a fifth lens (L5) successively and coaxially arranged along the transmission direction of incident light rays. The first lens (L1) is a biconvex lens, the second lens (L2) is a biconcave lens, the third lens (L3) is a meniscus lens, the fourth lens (L4) is a meniscus lens, and the fifth lens (L5) is a meniscus lens. The first lens (L1) and the second lens (L2) are glued to one another, and the fourth lens (L4) and the fifth lens (L5) are glued to one another.

Abstract: An optical lens for laser marking includes a first lens (L1), a second lens (L2), and a third lens (L3), which are successively coaxially arranged along a transmission direction of incident light, wherein the first lens (L1) and the second lens (L2) are meniscus lenses, and the third lens (L3) is a biconvex lens; wherein the first lens (L1) has a first surface (S1) and a second surface (S2), the second lens (L2) has a third surface (S3) and a fourth surface (S4), the third lens (L3) has a fifth surface (S5) and a sixth surface (S6); the first surface (S1) to the sixth surface (S6) are successively arranged along the transmission direction of the incident light; wherein radii of curvature of the first surface to the sixth surface are ?47±5% mm, ?, ?218±5% mm, ?81±5% mm, 778±5% mm, and ?142±5% mm, respectively; wherein central thicknesses of the first lens, the second lens, and the third lens are 4±5% mm, 15±5% mm, and 18±5% mm, respectively.

Abstract: A far infrared detector and objective lens and lens set thereof. The far infrared imaging lens set (10) comprises a first lens (100) and a second lens (200) arranged in sequence along a principal axis; the first lens (100) has a first curved surface (102) having a radius of curvature of 2.4×(1±5%) mm and a second curved surface (104) having a radius of curvature of 2×(1±5%) mm; the second lens (200) has a third curved surface (202) having a radius of curvature of 50×(1±5%) mm and a fourth curved surface (204) having a radius of curvature of 60×(1±5%) mm; wherein the first curved surface (102), the second curved surface (104), the third curved surface (202), and the fourth curved surface (204) are arranged in sequence; the first curved surface (102), the second curved surface (104) and the third curved surface (202) are all convex to the object side, and the fourth curved surface is convex to the image side. Distant targets can be detected in dark and foggy environments, and imaging capability is high.

Abstract: An optical lens comprising a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), and a fifth lens (L5) that are sequentially arranged on a common optical axis in the transmission direction of an incident light. Both the first lens (L1) and the fifth lens (L5) are negative meniscus lenses. Both the second lens (L2) and the third lens (L3) are positive meniscus lenses. The fourth lens (L4) is a biconvex lens. The optical lens is applicable in an optical system of a laser processing apparatus. When an employed processing wavelength is different from a monitoring wavelength, imaging color differences in a monitoring system can thus be eliminated, specifically, when a wavelength in the infrared range is employed as a laser processing wavelength while a red wavelength serves as the monitoring wavelength, improved imaging effects are provided in the monitoring system, thus ensuring the quality of laser processing.

Abstract: A lens module (50) and a 3D printer (100) comprising same. The lens module comprises a first lens (L1), a second lens (L2) and a third lens (L3) sequentially and coaxially arranged in the transmission direction of incident light. The first lens, the second lens and the third lens are all meniscus lenses. The first lens comprises a first curved surface (S1) and a second curved surface (S2). The second lens comprises a third curved surface (S3) and a fourth curved surface (S4). The third lens comprises a fifth curved surface (S5) and a sixth curved surface (S6). The first to the sixth curved surfaces are sequentially arranged in the transmission direction of the incident light, and the curvature radii of the first to the sixth curved surfaces are sequentially ?200±5%, ?100±5%, ?80±5%, ?150±5%, ?100±5% and ?70±5% in a unit of millimeter. By means of the lens module, the printing efficiency of the 3D printer is high and it is convenient to carry out printing of ultra-large workpieces.

Abstract: An F-? lens for laser engraving includes a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are coaxially arranged along a transmission direction of incident light; wherein the first lens (L1) is a meniscus lens, the second lens (L2) is a meniscus lens, the third lens (L3) is a plano-convex lens, and the fourth lens (L4) is a flat lens; wherein the first lens (L1) has a first surface (S1) and a second surface (S2), the second lens (L2) has a third surface (S3) and a fourth surface (S4), the third lens (L3) has a fifth surface (S5) and a sixth surface (S6), and the fourth lens (L4) has a seventh surface (S7) and an eighth surface (S8); the first surface (S1) to the eighth surface (S8) are sequentially arranged along the transmission direction of the incident light; wherein radii of curvature of the first surface (S1) to the eighth surface (S8) are ?29 mm, ?88 mm, ?56 mm, ?36 mm, ?, ?116 mm, ?, and ?, respectively; and center thicknesses (d1, d2, d3, d4) of the first lens (L

Abstract: An F-? lens for laser engraving includes a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are coaxially arranged along a transmission direction of incident light; wherein the first lens (L1) is a meniscus lens, the second lens (L2) is a meniscus lens, the third lens (L3) is a plano-convex lens, and the fourth lens (L4) is a flat lens; wherein the first lens (L1) has a first surface (S1) and a second surface (S2), the second lens (L2) has a third surface (S3) and a fourth surface (S4), the third lens (L3) has a fifth surface (S5) and a sixth surface (S6), and the fourth lens (L4) has a seventh surface (S7) and an eighth surface (S8); the first surface (S1) to the eighth surface (S8) are sequentially arranged along the transmission direction of the incident light; wherein radii of curvature of the first surface (S1) to the eighth surface (S8) are ?29 mm, ?88 mm, ?56 mm, ?36 mm, ?, ?116 mm, ?, and ?, respectively; and center thicknesses (d1, d2, d3, d4) of the first lens (L

Abstract: An F? lens for infrared large-format telecentric laser marking is disclosed, including a first lens element, a second lens element, a third lens element and a fourth lens element arranged sequentially along the propagation direction of an incident ray. The first lens element is a negative biconcave lens element including a first curved surface and a second curved surface. The second lens element is a positive meniscus lens element including a third curved surface and a fourth curved surface. The third lens element is a positive meniscus lens element including a fifth curved surface and a sixth curved surface. The fourth lens element is a plane lens adapted to play a role in protecting other lens elements. The first to third lens elements are arranged around a same axis along the propagation direction of the incident ray. The first to sixth curved surfaces are arranged sequentially along the propagation direction of the incident ray.

Abstract: A photographic objective lens includes seven lenses, wherein a first lens is a meniscus lens, a second lens is a meniscus lens, a third lens is a meniscus lens, a fourth lens is a biconcave lens, a fifth lens is a biconvex lens, a sixth lens is a biconvex lens, a seventh lens is a meniscus lens. The first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, the fourth lens has a seventh curved surface and a eighth curved surface, the fifth lens has a ninth curved surface and a tenth curved surface, the sixth lens has a eleventh curved surface and a twelfth curved surface, and the seventh lens has a thirteenth curved surface and a fourteenth curved surface; wherein the first curved surface to the fourteenth curved surface are sequentially arranged along a transmission direction of incident light.

Abstract: A photographic objective lens includes a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), and a seventh lens (L7), which are sequentially coaxially arranged along a propagation direction of incident light, wherein the first lens (L1) is a negative meniscus lens; the second lens (L2) is a drum lens; the third lens (L3) is a negative meniscus lens; the fourth lens (L4) is a drum lens; the fifth lens (L5) is a biconcave lens; the sixth lens (L6) is a positive meniscus lens; the seventh lens (L7) is a biconvex lens; the two curved surfaces of each lens are the light incidence surface and the light outgoing surface of the lens, respectively.

Abstract: An optical lens includes a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are successively coaxially arranged along the transmission direction of incident light, wherein the first lens (L1) and the fourth lens (L4) are negative meniscus lenses, the second lens (L2) is a positive meniscus lens, and the third lens (L3) is a positive plano-convex lens. The optical lens can be applied to an optical system of a laser processing device, when a utilized processing wavelength is different from a monitoring wavelength, the imaging chromatic aberration in a monitoring system may be eliminated, particularly when a wavelength of the far infrared region is utilized as a wavelength for laser processing. When using the red light wavelength as the monitoring wavelength, the monitoring system can achieve a better imaging effect, thus ensuring the quality of laser processing.

Abstract: A telecentric optical lens (100), comprising a first lens (L1) to a fifth lens (L5) arranged sequentially and co-axially along the direction of transmission of the incident light ray; the first lens (L1) is a plano-concave negative lens; the second lens (L2) is a meniscus negative lens; the third lens (L3) is a meniscus negative lens; the fourth lens (L4) is a biconvex positive lens; and the fifth lens (L5) is a plano-concave negative lens; the arrangement and design parameters of the first lens (L1) to the fifth lens (L5) of the telecentric optical lens (100) allow said telecentric optical lens (100) to achieve a telecentric effect, and simultaneously satisfy achromatic and relatively large aperture requirements.

Abstract: An optical lens, comprising a first to an eighth lens (L1, L2, L3, L4, L5, L6, L7, L8) coaxially arranged in sequence along the direction of transmission of an incident light ray.

Abstract: An optical lens for laser marking includes a first lens (L1), a second lens (L2), and a third lens (L3), which are successively coaxially arranged along a transmission direction of incident light, wherein the first lens (L1) and the second lens (L2) are meniscus lenses, and the third lens (L3) is a biconvex lens; wherein the first lens (L1) has a first surface (S1) and a second surface (S2), the second lens (L2) has a third surface (S3) and a fourth surface (S4), the third lens (L3) has a fifth surface (S5) and a sixth surface (S6); the first surface (S1) to the sixth surface (S6) are successively arranged along the transmission direction of the incident light; wherein radii of curvature of the first surface to the sixth surface are ?47±5% mm, ?, ?218±5% mm, ?81±5% mm, 778±5% mm, and ?142±5% mm, respectively; wherein central thicknesses of the first lens, the second lens, and the third lens are 4±5% mm, 15±5% mm, and 18±5% mm, respectively.

Abstract: A lens module (50) and a 3D printer (100) comprising same. The lens module comprises a first lens (L1), a second lens (L2) and a third lens (L3) sequentially and coaxially arranged in the transmission direction of incident light. The first lens, the second lens and the third lens are all meniscus lenses. The first lens comprises a first curved surface (S1) and a second curved surface (S2). The second lens comprises a third curved surface (S3) and a fourth curved surface (S4). The third lens comprises a fifth curved surface (S5) and a sixth curved surface (S6). The first to the sixth curved surfaces are sequentially arranged in the transmission direction of the incident light, and the curvature radii of the first to the sixth curved surfaces are sequentially ?200±5%, ?100±5%, ?80±5%, ?150±5%, ?100±5% and ?70±5% in a unit of millimeter. By means of the lens module, the printing efficiency of the 3D printer is high and it is convenient to carry out printing of ultra-large workpieces.

Abstract: A lens module, comprising a first lens, a second lens and a third lens sequentially and coaxially arranged in the transmission direction of incident light. The first lens is a biconcave lens, the second lens is a meniscus lens, and the third lens is a biconvex lens. The first lens comprises a first curved surface and a second curved surface. The second lens comprises a third curved surface and a fourth curved surface. The third lens comprises a fifth curved surface and a sixth curved surface. The first to the sixth curved surfaces are sequentially arranged in the transmission of the incident light, and the curvature radii of the first to the sixth curved surfaces are sequentially ?37±5%, 400±5%, ?130±5%, ?60±5%, 360±5%, and ?68±5%, in a unit of millimeter. Due to the arrangement and parameter design of the first to the third lenses of the lens module, the 3D printer can achieve high machining precision. The present invention also provides a 3D printer and a 3D printing method thereof.