Largan Precision has been granted a patent for a photographing lens assembly consisting of eight lens elements. The assembly includes a first lens element with positive refractive power, a sixth lens element with negative refractive power, and a seventh lens element with a concave image-side surface. The eighth lens element also has a concave image-side surface with at least one critical point in an off-axis region. The patent claims specify various conditions that must be satisfied for the lens assembly. GlobalData’s report on Largan Precision gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Largan Precision, AR/VR head-up displays was a key innovation area identified from patents. Largan Precision's grant share as of September 2023 was 82%. Grant share is based on the ratio of number of grants to total number of patents.
Photographing lens assembly with specific lens element arrangement
A recently granted patent (Publication Number: US11774714B2) describes a photographing lens assembly consisting of eight lens elements. The lens elements are arranged in a specific order from the object side to the image side. The sixth and eighth lens elements have negative refractive power and concave image-side surfaces in the paraxial region. The first lens element has a central thickness of CT1, and the maximum central thickness among the second through eighth lens elements is MaxCT28. The seventh lens element has a curvature radius of R14 on its image-side surface, and the eighth lens element has a curvature radius of R15 on its object-side surface. The assembly satisfies certain conditions related to axial distances and thicknesses of the lens elements.
Additionally, the patent claims that the object-side surfaces and image-side surfaces of the sixth through eighth lens elements have at least one critical point in an off-axis region. The lens elements have different Abbe numbers and refractive indices, and at least two lens elements satisfy specific conditions related to these parameters. The axial distance between the seventh and eighth lens elements is T78, and their central thicknesses are CT7 and CT8, respectively, satisfying a particular condition. The entrance pupil diameter of the lens assembly is EPD, and the axial distance between the object-side surface of the third lens element and the image-side surface of the fifth lens element is Dr5r10, meeting a specific condition.
Furthermore, the patent describes conditions related to the vertical distances between critical points on the image-side surfaces of the sixth, seventh, and eighth lens elements. The focal length of the lens assembly is f, and the curvature radii of the image-side surfaces of the sixth, seventh, and eighth lens elements are R12, R14, and R16, respectively, satisfying a particular condition. The assembly also meets conditions related to the axial distances between lens elements and the presence of critical points in the off-axis region of the eighth lens element.
Lastly, the patent includes conditions related to the f-number, maximum field of view, axial distances between adjacent lens elements, axial distances between the first lens element and the image surface, and the focal lengths of the lens elements. These conditions ensure the optimal performance and functionality of the photographing lens assembly.
In summary, the granted patent describes a specific arrangement and configuration of lens elements in a photographing lens assembly, along with various conditions related to their parameters and distances. These features aim to improve the performance and image quality of the lens assembly.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
