4results about How to "Focus adjustment" patented technology

A zoom endoscope optical system comprises, in order from the object side to the image side along the optical axis, a front fixed lens group, a zoom lens group and a compensation lens group, the front fixed lens group comprises a first lens, a second lens and a third lens, the zoom lens group is adjustable in position and comprises a fourth lens and a fifth lens, the compensation lens group is adjustable in position and comprises a sixth lens, a seventh lens, an eighth lens and a ninth lens, the ninth lens is an aspheric lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are spherical lenses, compared with the prior art, the eight spherical lenses and the one aspheric lens are arranged, thereby reducing the length of the optical system, shortening the lens diameter, simultaneously assisting in correcting the imaging quality, and the aspheric lens guarantees the edge precision and improves the imaging effect of detecting the tiny defects in the pipeline.

The application provides a broadband asymmetric mode converter and an asymmetric acoustic focusing lens device, the asymmetric mode converter comprising a phased unit, a cross solid and a convex waveguide, the phased unit having two rows of oppositely arranged Helmholtz resonators inside, a channel penetrating through the upper and lower ends of the phased unit between the two rows of Helmholtz resonators, the phased unit converting a plane wave into a first-order acoustic wave, the plane wave being able to pass through the convex waveguide while the first-order acoustic wave being unable to pass through the convex waveguide, and realizing one-way transmission of acoustic waves; the asymmetric acoustic focusing lens device comprising a plurality of asymmetric mode converters and a solid base, a plurality of circles of the asymmetric mode converters being arranged in an array on a plurality of circumferences with different diameters and with the center of the solid base as the center, the phase arrangement of the phased unit of each circle of the asymmetric mode converters being adjustable, the focal length of the asymmetric acoustic focusing lens device being adjustable, and the asymmetric acoustic focusing lens device having high transmittance characteristics and broadband characteristics.

This invention proposes a zoom lens sleeve device and a microscopic imaging system. The zoom lens sleeve device includes a sleeve and multiple lens groups arranged sequentially from the object side to the image side. The multiple lens groups are installed inside the sleeve along the axial direction of the sleeve, forming an optical axis extending along the axial direction of the sleeve. Each lens group includes a first lens group and a second lens group. The first lens group has positive optical power and is movably disposed radially along the sleeve. The second lens group has positive optical power and is fixedly disposed on the optical axis. The zoom function of the zoom lens sleeve device is achieved by moving the first lens group onto the optical axis. In this technical solution, by movably distributing the first lens group radially along the sleeve, the zoom lens sleeve device can automatically switch focal lengths, thereby adjusting the focal length of the entire optical system.

This utility model relates to the field of lead selenide detector technology, specifically a lead selenide detector with adjustable focal length. It includes an instrument body and a base for mounting the instrument body. Two retainers are fixedly connected to the top of the base, and the instrument body is installed within the retainers. A movable plate is slidably mounted on the top of the base, and a placement frame is fixedly connected to the top of the movable plate away from the instrument body. A lens assembly is housed within the placement frame. This utility model features retainers, a movable plate, a placement frame, and a lens assembly. The lens assembly and the placement frame are connected by a plug-in joint, enabling the lens assembly to be detachable and replaceable. This allows for the replacement of lenses of different specifications according to different usage requirements, thereby adjusting the detector's focal length. Simultaneously, adjusting the distance between the lens body and the instrument body also changes the focal length of the instrument body. Furthermore, the retainers and placement frame provide a stable support structure for the instrument body and the lens assembly.