5 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.

The utility model discloses an optical imaging system and an endoscope. The optical imaging system comprises a first lens, a second lens, a third lens, a triple cemented lens group, a double cemented lens group and a steering prism which are sequentially arranged from an object side to an image side. Wherein the object side surface of the first lens is a convex surface at the optical axis, and the image side surface of the first lens is a concave surface at the optical axis; the second lens is a 30-degree steering prism; the object side surface of the third lens is a plane, and the image side surface of the third lens is a convex surface; the object side surface and the image side surface of the fourth lens in the triple cemented lens group are convex surfaces, the object side surface and the image side surface of the fifth lens are concave surfaces, and the object side surface and the image side surface of the sixth lens are convex surfaces; the object side surface of the seventh lens in the doublet lens group is a plane, the image side surface of the seventh lens is a convex surface, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. According to the optical imaging system and the endoscope, at least the problems that an optical imaging system of the endoscope is large in aperture and large in imaging distortion can be solved.

The utility model relates to the technical field of optics, in particular to a low-cost large-field-of-view low-light objective lens optical system, which comprises a first lens, a triplet lens and a doublet lens, the triplet lens is arranged on one side of the first lens, and the doublet lens is arranged on one side, far away from the first lens, of the triplet lens; the triplet lens comprises a second lens, a third lens and a fourth lens, the doublet lens comprises a fifth lens and a sixth lens, the second lens is arranged on one side of the first lens, the third lens is arranged between the second lens and the fourth lens, the fifth lens is arranged on one side, far away from the third lens, of the fourth lens, and the sixth lens is arranged on one side of the sixth lens. The sixth lens is arranged on the side, away from the fourth lens, of the fifth lens. The side, away from the fifth lens, of the sixth lens is provided with a seventh lens. In this way, the technical problem that in the prior art, a large-view-field low-light objective lens optical system is difficult to meet the requirements of low cost, compact structure and good imaging effect at the same time is solved.

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.