An alignment mechanism to position and focus a lens assembly includes a housing and an eccentric shaft supported by the housing. The eccentric shaft is configured to rotate with respect to the housing. The alignment mechanism further includes a lens assembly having a bracket coupled to the eccentric shaft, and an actuator assembly, coupled to the bracket of the lens assembly and configured to rotate the lens assembly about the eccentric shaft. The alignment mechanism further includes at least one thrust drive nut mounted on the eccentric shaft, the at least one thrust drive nut being configured to move the eccentric shaft and the bracket of the lens assembly in a z-axis direction.

A reading aid for magnifying text includes a first frame. The first frame comprises an annular wall that extends from a top to a bottom. The bottom is open. A first lens is positioned in the top. A second lens is adjustably coupled to an interior of the annular wall. The second lens is parallel planarly positioned relative to the first lens. A power module is coupled to the first frame. A plurality of lights is coupled to an upper end of the first frame. The lights are operationally coupled to the power module. The second lens is adjustably positionable relative to the first lens to obtain a magnification level required by a user. The lights are configured to illuminate a printed item positioned beneath the first frame such that the printed item is readable by the user.

A lens drive unit that prevents an actuator from being inclined is provided. In the lens drive unit, when a lens frame is displaced in a direction orthogonal to a direction in which the actuator extends and contracts with respect to a base member by, for example, impact from an outside of the lens drive unit, a drive shaft of the actuator abuts on a first lateral wall and a column, so that the actuator is prevented from being inclined with respect to the base member.

The invention discloses a three-piece optical lens for capturing image and a five-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with positive refractive power; a second lens with refractive power; and a third lens with refractive power; and at least one of the image-side surface and object-side surface of each of the three lens elements are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.

The invention discloses a three-piece optical lens for capturing image and a five-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with positive refractive power; a second lens with refractive power; and a third lens with refractive power; and at least one of the image-side surface and object-side surface of each of the three lens elements are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.

An optical imaging system includes a first lens having an object-side surface that is convex; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power and an object-side surface that is concave; and a sixth lens having a refractive power and an object-side surface that is concave, wherein the first lens through the sixth lens are sequentially disposed in numerical order from an object side of the optical imaging system toward an imaging plane, and the optical imaging system satisfies the conditional expressions 0.7<TL/f<1.0 and TL/2<f1, where TL is a distance from the object-side surface of the first lens to the imaging plane, f is an overall focal length of the optical imaging system, and f1 is a focal length of the first lens.

An optical imaging system includes a first lens having an object-side surface that is convex; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power and an object-side surface that is concave; and a sixth lens having a refractive power and an object-side surface that is concave, wherein the first lens through the sixth lens are sequentially disposed in numerical order from an object side of the optical imaging system toward an imaging plane, and the optical imaging system satisfies the conditional expressions 0.7<TL/f<1.0 and TL/2<f1, where TL is a distance from the object-side surface of the first lens to the imaging plane, f is an overall focal length of the optical imaging system, and f1 is a focal length of the first lens.

A control method for a follow focus wheel, a follow focus wheel and a storage medium are provided. The control method may include: acquiring angular position information of a rotor of a motor of the follow focus wheel and electrical parameters of a coil of the motor; completing an output torque control and a target closed-loop control of the motor based upon the angular position information and the electrical parameters; and determining an operation sensation to be simulated, and controlling the motor to run based on a motor control strategy corresponding to the operation sensation to be simulated so as to provide corresponding operation sensation feedback.

A control method for a follow focus wheel, a follow focus wheel and a storage medium are provided. The control method may include: acquiring angular position information of a rotor of a motor of the follow focus wheel and electrical parameters of a coil of the motor; completing an output torque control and a target closed-loop control of the motor based upon the angular position information and the electrical parameters; and determining an operation sensation to be simulated, and controlling the motor to run based on a motor control strategy corresponding to the operation sensation to be simulated so as to provide corresponding operation sensation feedback.

This optical system (OL) comprises a front group (GA), an aperture stop (S), and a rear group (GB) that are arranged in order from the object side along an optical axis. The rear group (GB) has a focusing lens group (GF1) disposed closest to the object side in the rear group (GB) and having negative refractive power, during focusing, the focusing lens group moves along the optical axis, and the spacing between adjacent lens groups changes, and the following conditional expression is satisfied. 0.50<ST/TL<0.95, where ST is the distance on the optical axis from the aperture stop (S) to an image surface (I), and TL is the total length of the optical system (OL).