Abstract: Provided is an optical imaging lens, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially arranged along an optical axis from an object side to an image side. The first lens element has positive refracting power. A periphery region of the object-side surface of the second lens element is convex. The third lens element has positive refracting power. A periphery region of the image-side surface of the third lens element is concave. An optical axis region of the image-side surface of the fifth lens element is concave. An optical axis region of the image-side surface of the sixth lens element is convex. A periphery region of the object-side surface of the eighth lens element is convex.

Abstract: An optical imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially along an optical axis from an object side to an image side is provided. Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. A periphery region of the object-side surface of the third lens element is concave, and a periphery region of the image-side surface of the third lens element is convex. Lens elements of the optical imaging lens are only the above-mentioned eight lens elements, and the optical imaging lens satisfies the condition of D11t62/D71t82?2.400.

Abstract: An ocular optical system, configuring to allow imaging rays from a display screen to enter an eye of an observer through the ocular optical system to form an image is provided. The ocular optical system comprises a first optical element and a second optical element sequentially arranged along an optical axis from an eye-side to a display-side, each of the first optical element and the second optical element comprising an eye-side surface and a display-side surface. The ocular optical system also comprises a reflective polarizing film and a quarter-wave plate, the eye-side surface of the first optical element and the display-side surface of the first optical element satisfy a conditional expression as follows: PV?160 ?m, wherein a PV is a peak to valley value of a surface. In addition, a mass production manufacturing method of the ocular optical system is also provided.

Abstract: An optical imaging lens includes first to seventh lens elements sequentially arranged along an optical axis from an object side to an image side, wherein each of the first lens element to the seventh lens element includes an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through. The first lens element has positive refracting power, and a periphery region of the image-side surface of the first lens element is concave. The second lens element has negative refracting power. An optical axis region of the image-side surface of the third lens element is convex. An optical axis region of the image-side surface of the fourth lens element is concave. The sixth lens element has negative refracting power. In particular, the optical imaging lens only has seven lens elements.

Abstract: Disclosed are an image content extraction method and an image content extraction apparatus, a terminal, and a storage medium. The image content extraction method includes acquiring an image to be processed. Performing high-contrast retention on the image to be processed to obtain a high-contrast image of the image to be processed. Performing image fusion on the image to be processed and the high-contrast image to obtain a fused image. Performing linear light enhancement on the fused image to obtain a linear light-enhanced image. And using first pixel points, having pixel values located within a preset pixel value range, in the linear light-enhanced image as an image content of the image to be processed. The present disclosure can improve the integrity of image content extraction.

Abstract: An ocular optical system for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen is provided. A side facing towards the eye is an eye-side, and a side facing towards the display screen is a display-side. The ocular optical system includes a first lens element, a second lens element, and a third lens element from the eye-side to the display-side in order along an optical axis. The first lens element, the second lens element, and the third lens element each include an eye-side surface and a display-side surface. The ocular optical system satisfies: 40°??, where ? represents a half apparent field of view, which is one half the field of view of an observer.

Abstract: An optical imaging lens, including a first lens element and a second lens element arranged in sequence from an object side to an image side along an optical axis. Each of the first lens element and the second lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. An optical axis region of the image-side surface of the second lens element is concave, and a periphery region of the image-side surface of the second lens element is convex.

Abstract: An optical imaging lens includes first to third lens element groups in sequence along an optical axis from an object side to an image side. The first lens element group includes at least two lens elements. The second lens element group includes at least two lens elements. The third lens element group includes at least two lens elements. When the optical imaging lens is zoomed, at least one lens element group is moved toward a direction of the object side or the image side along the optical axis.

Abstract: The present invention discloses an antimicrobial agent, an antimicrobial high-performance POM composite material, and preparation methods thereof, wherein the preparation method of the antimicrobial agent comprises: Preparing a Tris-HCl buffer solution by mixing a tris(hydroxymethyl)aminomethane solution with a HCl solution; Adding the Tris-HCl buffer solution and dopamine hydrochloride, magnesium ions, hydroxide ions and solvent into deionized water, and performing a polymerization reaction to obtain Solution A; Placing solution A, hydrogen peroxide, solvent and deionized water into a reaction vessel, and performing an oxidation reaction to synthesize and obtain PDA@MgO2 antimicrobial agent. The catechol in polydopamine in the PDA@MgO2 antimicrobial agent in present application provides highly efficient modification sites, which can bond with multiple substances through its metal chelating effect and various chemical reactions.

Abstract: Disclosed is an optical imaging lens including a first lens element, a second lens element, a third lens element and a fourth lens element arranged in a sequence from an object side to an image side along an optical axis. Refracting power of the second lens element is positive. An image side surface of the Nth lens element counted from the object side to the image side along the optical axis is cemented to an object side surface of the N+1th lens element counted from the object side to the image side along the optical axis, and N is a positive integer greater than or equal to 1 and less than or equal to 3. The optical imaging lens satisfies: EFL/Fno?2.200 mm, wherein EFL is an effective focal length of the optical imaging lens, and Fno is a f-number of the optical imaging lens.

Abstract: An optical imaging lens including a first lens element to an eighth lens element arranged in sequence from an object side to an image side along an optical axis is provided. A periphery region of the image-side surface of the first lens element is concave. An optical axis region of the object-side surface of the fourth lens element is convex. The sixth lens element has positive refracting power. An optical axis region of the object-side surface of the seventh lens element is convex, and an optical axis region of the image-side surface of the seventh lens element is concave.

Abstract: An optical imaging lens sequentially includes a first lens element, a second lens element, a third lens element, and a fourth lens element along an optical axis from an object side to an image side. Each of the first lens element to the fourth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through, and an image-side surface facing the image side and allowing the imaging rays to pass through. The first lens element has negative refracting power, and a periphery region of the object-side surface of the first lens element is convex. At least one of an optical axis region of the object-side surface of the second lens element and an optical axis region of the image-side surface of the second lens element is plane. The third lens element has negative refracting power or the fourth lens element has positive refracting power.

Abstract: An optical imaging lens includes, sequentially from an object side to an image side along an optical axis, a first to seventh lens elements each having an object-side surface and an image-side surface. The optical imaging lens satisfies EFL/(G12+G67)?5.600, wherein EFL is an effective focal length of the optical imaging lens, G12 is an air gap from the first lens element to the second lens element along the optical axis, and G67 is an air gap from the sixth lens element to the seventh lens element along the optical axis.

Abstract: An intermediate structure is used for the preparation of a lithium secondary battery electrode on one side and/or on both sides. The preparation method for an intermediate structure includes the following steps: laminating a film on one side and/or on both sides of a substrate, and forming through holes in the film, the central axis of the through holes being perpendicular to the plane of the substrate; wherein, the substrate is a conductive substrate, and the film is a flexible polymer film; growing conductive materials in the through holes to form a one-dimensional columnar structure perpendicular to the substrate in the through holes; and removing the film to obtain an intermediate structure.

Abstract: Disclosed are a lithium secondary battery negative electrode and a preparation process therefor. The lithium secondary battery negative electrode includes: a substrate, which is a conductive substrate; a one-dimensional columnar structure, which grows on one side or both sides of the substrate and is perpendicular to a plane where the substrate is located, the one-dimensional columnar structure being a conductive structure; an active material layer, which is located on the substrate and is perpendicular to the plane where the substrate is located, the active material layer covering an outer surface of the one-dimensional columnar structure; and a protective layer, which is located on the substrate and is perpendicular to the plane where the substrate is located, the protective layer covering an outer surface of the active material layer.

Abstract: Disclosed are a template as well as a manufacturing method and use, an intermediate structure of a lithium secondary battery electrode and a lithium secondary battery electrode. The template is used for preparing the lithium secondary battery electrode on one surface and/or two surfaces. The manufacturing method for the template includes the following steps: laminating a film material on a substrate, and allowing the film material to be formed with through holes, central axes of the through holes being perpendicular to a plane where the substrate is located; where the substrate is a conductive substrate, and the film material is a flexible polymer thin film. When used for preparing the lithium secondary battery electrode, the template has the advantages of low manufacturing cost, convenient large-area synthesis, suitability for mass production, etc.

Abstract: An optical imaging lens includes a lens barrel, a plurality of lens elements, and a light-shielding element. The lens barrel has a mounting portion. Each of the lens elements has an object-side mechanic surface facing an object side and an image-side mechanic surface facing an image side. The optical imaging lens satisfies the following conditional expression: T1?180 ?m and at least one of the following conditional expressions: T3?255 ?m and ?200 ?m<RA1?RA2?450 ?m. T1 is a maximum thickness of the light-shielding element in a direction parallel to the optical axis. T3 is a maximum thickness of an optical element closest to the carrying surface in a direction parallel to the optical axis. The mounting portion can carry the light-shielding element and has a carrying surface facing the image side.

Abstract: An optical imaging lens includes first to seventh lens elements sequentially arranged along an optical axis from an object side to an image side, and each including an object-side surface facing toward the object side and allowing an imaging ray to pass through and an image-side surface facing toward the image side and allowing the imaging ray to pass through. The first lens element has positive refracting power. The fourth lens element has positive refracting power. A periphery region of the object-side surface of the fourth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is convex. An optical axis region of the image-side surface of the sixth lens element is concave. An optical axis region of the object-side of the seventh lens element is concave. Lens elements of the optical imaging lens are only the seven lens elements described above.

Abstract: An optical element for multiple reflections of stray light includes a plurality of microstructures configured around a central axis of the optical element. Each of the microstructures includes a first reflective surface and a second reflective surface which are in contact, and has a connection line, which is a boundary line between the first reflective surface and the second reflective surface. An extension line of the connection line passes through the central axis, where the plurality of microstructures are arranged in a plurality of rings adjacent to each other, and the plurality of microstructures of two adjacent rings in the rings are alternately arranged with each other.

Abstract: An optical imaging lens sequentially including a first lens element to a ninth lens element arranged in sequence from an object side to an image side along an optical axis is provided. Each of the first lens element to the ninth lens element includes an object-side surface facing the object-side surface and allowing imaging rays to pass through and an image-side surface facing the image-side and allowing the imaging rays to pass through. Lens elements of the optical imaging lens are only the nine lens elements described above, wherein an periphery region of the image-side surface of the first lens element is concave, an optical axis region of the object-side surface of the ninth lens element is concave, and a thickness of the first lens element on the optical axis is greater than a thickness of the eighth lens element on the optical axis.