3 results about "Triplet lens" patented technology

This invention provides a projection lens. The projection lens includes a lens group comprising at least eight lenses, which, from a first side to a second side, are sequentially: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with optical power. At least one group of lenses from the fourth to the eighth lens is cemented together to form a cemented doublet lens or a cemented triplet lens. The ratio between the combined focal length of the cemented doublet lens and the focal length of the second lens group is greater than or equal to 1 and less than or equal to 8; or, the ratio between the focal length of the cemented triplet lens and the focal length of the second lens group is greater than or equal to 0 and less than or equal to 14. This invention solves the problem in existing projection lenses where it is difficult to simultaneously achieve both high-quality projection and miniaturization.

This invention discloses a broadband miniature objective and imaging device. The objective, arranged along the optical axis from object to image, comprises: a positive optical power first lens (object concave, image convex, meniscus), a negative optical power second lens (meniscus), a positive optical power triplet lens group (composed of biconvex, biconcave, and biconvex lenses), and two biconvex positive optical power lenses. This invention utilizes only seven spherical lenses, and through a specific optical power configuration and proportional design, achieves diffraction-limited imaging with an image-side or tissue-side NA ≥ 0.5 and a field of view ≥ 240 μm within a broad spectral range of 480–860 nm, under extremely small outer diameter and length constraints. The miniature objective of this invention supports simultaneous high-resolution imaging with multicolor excitation and multichannel detection, enabling simultaneous observation of different fluorescent labels without changing the objective, making it particularly suitable for immersion imaging environments. Imaging devices constructed based on this objective can be widely applied in biomedical imaging fields such as endoscopy and confocal microscopy.