14 results about "Triplet lens" patented technology

An example system includes a first steering layer interposed between an electromagnetic (EM) source and an emission lens. The first steering layer includes a triplet lens having a Plano-convex lens, a Plano-concave lens, and an electro-optical (EO) crystal positioned between the lenses. The EO crystal includes transparent electrodes on each side, coupled to the respective lenslet and / or the EO crystal. The system includes the EM source providing an incident EM beam on the first steering layer, and the emission lens emitting a steered EM beam to a target location.

The embodiment of the invention provides a projection lens module and micro projection equipment. The projection lens module comprises a first lens group, a second lens group and a diaphragm which are arranged along the same optical axis; the first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the optical axis, the first lens, the second lens, the third lens and the fourth lens are all negative focal power, and the fourth lens is positive focal power; the second lens group comprises a triple bonding lens and an eighth lens which are arranged along the optical axis, the triple bonding lens is mainly formed by bonding a fifth lens, a sixth lens and a seventh lens, and both the triple bonding lens and the eighth lens have positive focal power; the diaphragm is positioned between the fourth lens and the fifth lens; wherein the center thickness T3 of the third lens and the total optical length TTL of the projection lens module meet the condition that T3 / TTL is larger than or equal to 11% and smaller than or equal to 19%, and the center thickness T'of the triplet lens and the total optical length TTL of the projection lens module meet the condition that T ' / TTL is larger than or equal to 12%.

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.

An embodiment of the present application provides a projection lens module and a projection device; the projection lens module includes a first lens group, an aperture and a second lens group in sequence from the image side to the object side along the optical axis; the first lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence, wherein: the first lens is an aspheric lens with positive optical focal length, and the relationship between its center thickness T1 and the total optical length TTL of the projection lens module satisfies: 2.4%<T1 / TTL<3.1%; the second lens, the third lens and the fourth lens are cemented together to form a triplet lens, and the triplet lens as a whole has negative optical focal length; the second lens group includes a fifth lens to an eleventh lens arranged in sequence, wherein: the fifth lens to the eighth lens have positive optical focal length; the ninth lens to the eleventh lens have negative optical focal length; the aperture is located between the triplet lens and the fifth lens.

Ergonomic prism loupes provide establish deflection angle less than 45 degrees, more preferably around 40 degrees, to improves visual and postural ergonomics. It has been determined that with such a deflection angle, maximum head tilt is less than 20° for the vast majority of procedural configurations. The prism may be a roof prism. The eyepiece portion may include a singlet and a doublet lenses, and the objective portion may include a triplet lens. The objective portion may also include an optical element that establishes a working distance, and different eyepiece or objective portions may be provided for a range of magnifications. The invention further includes a structure for mounting the loupes on eyeglass frames, such as a through-the-lens (TTL) mounting structure, a front-lens mounting (FLM) structure, or a flip-up mounting structure.

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 present invention belongs to the field of endoscopes, and particularly relates to a rigid tube optical microscope endoscope and its objective lens, wherein the objective lens is provided with a first negative power lens, a first positive power triplet lens group, a second positive power triplet lens group, and a fifth positive power lens in sequence from the object side to the image side; wherein: the first positive power triplet lens group is composed of a second negative power lens, a first positive power lens, and a second positive power lens; the second positive power triplet lens group is composed of a third positive power lens, a third negative power lens, and a fourth positive power lens. The endoscope objective lens of the present invention is composed of a first negative power lens, a first positive power triplet lens group, a second positive power triplet lens group, and a fifth positive power lens, which solves the problem of lens miniaturization while improving imaging quality to 8K.

The embodiment of the invention provides a screen detection optical module and screen detection optical equipment. The optical module comprises a first lens group, a second lens group and a triplet lens group, and a to-be-detected screen is arranged on the image surface side of the triplet lens group; the first lens group comprises a first lens and a second lens, and the focal power of the first lens and the focal power of the second lens are negative. The second lens group comprises a third lens, a fourth lens, a fifth lens and a sixth lens, and the focal power of the third lens to the sixth lens is positive; the third lens and the sixth lens are in mirror symmetry, and the fourth lens and the fifth lens are in mirror symmetry; the triplet lens group comprises a seventh lens, an eighth lens and a ninth lens, the seventh lens, the eighth lens and the ninth lens are optically cemented to form the triplet lens group, the triplet lens group is provided with a twelfth surface, a thirteenth surface, a fourteenth surface and a fifteenth surface, and the curvature radius of the triplet lens group meets the formula: R12gt; 0, R13lt; 0, R14gt; 0, R15gt; 0, and R14lt; r121t; R121t; r < 15lt >; and R13.

The invention discloses a water immersion objective lens applied to a confocal imaging system, and the objective lens comprises a first lens, an aperture diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens which are sequentially arranged from an image space to an object space and are coaxially arranged. The first lens is a positive focal power, the second lens is a positive focal power, the third lens, the fourth lens and the fifth lens form a triplet lens group with a negative focal power, the sixth lens is a positive focal power, the seventh lens is a negative focal power, and the eighth lens is a positive focal power. The water immersion objective lens with high resolution and large numerical aperture is formed through the optical lens with a simple and compact structure, the imaging quality is high, the structure is reasonable, and the requirement of biological cell fluorescence research on the microscope objective lens can be met.

The utility model discloses an endoscope light path amplifying structure, a lens and an endoscope, and belongs to the technical field of endoscopes, the lens comprises the light path structure, the endoscope comprises the lens, the light path structure comprises a first fixed lens group, a movable lens group and a second fixed lens group which are arranged in sequence, and the first fixed lens group, the movable lens group and the second fixed lens group are arranged in parallel. The first fixed lens group comprises a first lens and a second lens arranged on the image space side of the first lens, the movable lens group comprises a third lens, and the second fixed lens group comprises a fourth lens and a fifth lens arranged on the image space side of the fourth lens; the first lens is a plano-concave lens, the second lens is a meniscus lens, the third lens is a triplet lens, the fourth lens is a positive lens, the fifth lens is a negative lens, and the imaging quality of the optical path system can be effectively guaranteed by setting the lenses on the optical path structure into specific structures.

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.

The embodiment of the invention provides a projection lens module and projection equipment. The projection lens module sequentially comprises a first lens group, a diaphragm and a second lens group from an image side to an object side along an optical axis; the first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged, the first lens is an aspherical lens with positive focal power, and the central thickness T1 of the first lens and the total optical length TTL of the projection lens module meet the condition that T1 / TTL is greater than 2.4% and less than 3.1%; the second lens, the third lens and the fourth lens are glued to form a triplet lens, and the whole triplet lens has negative focal power; the second lens group comprises a fifth lens to an eleventh lens which are sequentially arranged, wherein the fifth lens to the eighth lens have positive focal power; the ninth lens to the eleventh lens have negative focal power; and the diaphragm is positioned between the triplet lens and the fifth lens.