39results about How to "Evenly focused" patented technology

A lens barrel having a first moving barrel, second moving barrel, and a third moving barrel. The first moving barrel has first cam grooves configured corresponding to a focusing operation and holds an optical system used in a focusing operation. The second moving barrel has second cam grooves and is provided in relation to the first moving barrel. The third moving barrel has third cam grooves configured corresponding to a zoom operation and can move relative to a fixed barrel. The second cam grooves correct a position of said optical system corresponding to a drive operation of the third cam grooves.

This invention provides an auto-focus device, which is for eliminating an uncomfortable feeling when phase difference AF is switched to optical path length difference AF when an arbitrary area is set as a focusing target area, and a method for controlling operation of the same. A cameraman sets a desired area as the focusing target area. Until a focus lens reaches a first threshold value position, the focus lens is moved on the basis of a phase difference AF evaluation value obtained from a phase difference AF sensor so as to bring the center portion of the imaging area into focus. Until the focus lens reaches a second threshold value position, the focus lens is moved on the basis of a phase difference AF evaluation value which is output from a phase difference imaging element and is obtained from a signal of an area corresponding to the set focusing target area. When the focus lens reaches the second threshold value position, the focus lens is positioned at the focusing position using the differential AF evaluation value, which is obtained on the basis of the set focusing target area, among the differential AF evaluation values obtained from an optical path length difference AF sensor.

This focus sensor is readily usable in a system using pupil obscuration to measure the state of focus of a light beam. A scattering volumetric filter modifies a three-dimensional wavefront so that focus can be detected by a two-dimensional detector for conversion to a one-dimensional signal having values of plus, zero and minus. This diffusing filter comprises sub wavelength particles having a high index of refraction suspended in an adhesive to produce a solid diffuser. This focus sensor enables a well-behaved focus curve having a constant slope near best focus, while maintaining a slope that is either constant or monotonic at a minimal rate over an extended distance to support a long capture-range over which a focus-controlling servo-mechanism can acquire and maintain focus in the presence of corrupting target surface topography or optical defects.

The embodiment of the invention provides a focusing method based on a shooting scene and image pickup equipment. The method comprises the following steps: determining a feature value of acquired image data and / or a shooting parameter during acquisition of the image data; determining a shooting scene matched with the feature value of the image data and / or the shooting parameter from a plurality of preset shooting scenes; determining a preset focusing mode corresponding to the matched shooting scene; and performing focusing according to the determined focusing mode for shooting. In the embodiment of the invention, focusing in the preset focusing mode corresponding to the shooting scene is more suitable for the shooting scene than focusing in one focusing mode. Through adoption of the focusing method, focusing becomes more efficient and smooth; the phenomenon of virtual focus or dead focus can be avoided; the imaging definition is increased; and the user experience can be improved.

The invention relates to the field of a belt pulley pulling device, in particular to a stable hydraulic wheel puller. The stable hydraulic wheel puller comprises a base, a jack, a screw, a nut and a wheel pulling plate. The jack is connected with the base integrally, the wheel pulling plate is connected with the base through the screw, and the wheel pulling plate adopts a lock ring structure. The wheel pulling plate is formed by combining two locking pieces. Each locking piece is provided with a pin shaft and a shaft sleeve. Two crewed holes are formed in both ends of each pin shaft respectively. The wheel puller is arranged on the back of the belt pulley in a sleeving manner, so that the stress area of the belt pulley is enhanced; and the origin of force is uniform, and the belt pulley does not fall off and is not damaged, so that the work efficiency is greatly improved.

The invention discloses a wheel type air pick energy storage coke removing machine, and relates to the technical field of machinery. The wheel type air pick energy storage coke removing machine is characterized in that the bottom end of a frame plate and wheels are rotatably connected; the frame plate is fixed to a pneumatic device; an output end of the pneumatic device is fixed to the upper ends of supports; an annular gear on the frame plate is in occlusion with a circular gear on an output shaft of a gearbox connected with a rotating motor on a rotating body; an annular rail on the frame plate is movably connected with a rail wheel of the lower end of the rotating body in a rolling manner; the upper end of the rotating body is fixed to the lower end of a frame body; the frame body is fixed to the pneumatic device; the output end of the pneumatic device is fixed to a lifting arm; the upper end of the lifting arm and the lower end of a master arm, the upper end of the master arm and the lower end of a linkage arm, and the upper end of the linkage arm and a sleeve are rotatably and movably connected through servo motors; the back end inside the sleeve is fixed to the pneumatic device; the output end of the pneumatic device is fixed to the back end of a telescopic cylinder; the front end of the telescopic cylinder is fixed to the back end of an air pick; the upper surface of the front end of the air pick is fixed to a camera; the front end of the air pick is fixed to the back end of a steel chisel; and the sleeve and the telescopic cylinder are in plug-in mounting and the front part of the sleeve and the back part of the telescopic cylinder are movably connected in a sliding manner. The wheel type air pick energy storage coke removing machine is used for removing cokes of a utility boiler, and is simple and ingenious in structure, stable in effect, easy to manufacture, and low in cost.