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272 results about "Long-focus lens" patented technology
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In photography, a long-focus lens is a camera lens which has a focal length that is longer than the diagonal measure of the film or sensor that receives its image. It is used to make distant objects appear magnified with magnification increasing as longer focal length lenses are used. A long-focus lens is one of three basic photographic lens types classified by relative focal length, the other two being a normal lens and a wide-angle lens. As with other types of camera lenses, the focal length is usually expressed in a millimeter value written on the lens, for example: a 500 mm lens. The most common type of long-focus lens is the telephoto lens, which incorporate a special lens group known as a telephoto group to make the physical length of the lens shorter than the focal length.
Control method, control device and electronic device
ActiveCN106791377AImprove experienceImprove clarityTelevision system detailsImage enhancementLong-focus lensDisplay device
The present invention discloses a control method of an electronic device. First, a wide-angle lens is started, then, a display is controlled to display a cached wide-angle image as a preview image, next, when the preview image is zoomed in or out, a designated area is identified and the long-focus lens is started. Further, an actuator is controlled so as to enable a cached long-focus image to be in the designated area, and the wide-angle lens and the long-focus lens are controlled to image. Finally, a wide-angle image and a long-focus image are combined. The present invention further discloses a control device and an electronic device. According to the control method, the control device and the electronic device, when a user zooms in or out, the actuator is used to control the wide-angle lens and the long-focus lens to move relatively, so that the relative position of the overlapping part in the field of view of the wide-angle lens is changed, and the overlapping parts are combined so as to make a corresponding part clearer, therefore, when the user zooms in or out the designated area of cached wide-angle image, the long-focus lens can image the designated area so as to make the designated area clearer, and the user experience is improved.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Measurement mechanism of lens focal length, measurement method and thereof and optical quality evaluation method
InactiveCN101140196APrecision Measuring Focal LengthPrecise measurement of depth of focusTesting optical propertiesMeasurement deviceLong-focus lens
The invention relates to a device and a method for measuring lens focal length as well as a method for evaluating optical quality, wherein the device for measuring the lens focal length is composed of a plane mirror, a lens to be measured, a point light source, a vertical incision, a one-dimensional precise flat movable guide rail, a laser distance measuring instrument, a CCD detector and a display, and the method for measuring the lens focal length is as follows: (1) adjusting the autocollimation of the point light source and the lens to be measured; (2) adjusting the plane mirror to make the transflective convergent beam enter the CCD detector; (3) measuring the focal depth of the lens to be measured; (4) measuring the distance L from the point light source to the geometric main plane of the lens to be measured; (5) calculating the focal length f = L + d of the lens to be measured, and the d is the distance between the geometric main plane of the lens and the optical main plane. The optical processing quality of the lens to be measured is qualitatively evaluated through the observation of shape of the far-field focal spot. The device and the method are applied to the measurement and evaluation of the small-bore short-focus and large-bore long-focus lens, and have the advantages of the intuitionism, the high measuring precision and the simple mechanism.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Multifocal lens system for digital cameras
InactiveUS20050041300A1Change focal lengthMechanism is complicatedTelevision system detailsColor television detailsTelephoto lensLong-focus lens
A multifocal lens system to be used for digital cameras for setting any one of a plurality of lenses in a picture taking (image capturing) position comprising a wide-angle lens (shorter focal length lens) mounted in front of an image sensor in a picture taking (image capturing) position, a telephoto lens (longer focal length lens) mounted alongside the wide-angle lens, a parallelogram prism (rhombic prism) or a pair of triangular prisms removably arranged between the two lenses at the rear of them. When the wide-angle lens is to be used, the parallelogram prism or one of the two triangular prisms is to be removed from the rear of wide-angle lens so that the wide-angle lens can be focused on the sensor enabling light to pass therethrough. The telephoto lens is so positioned that it may be focused on the image sensor through the parallelogram prism or being reflected by the triangular prisms enabling light to pass therethrough when a part of the parallelogram prism or one of the two triangular prisms is placed in front of the image sensor to cover the imaging area of the sensor and to shut the light through the wide-angle lens to the sensor. By moving the prism from the rear of each lens, one of the two lenses can be positioned for picture taking (image capturing).
Owner:ARC DESIGN
Laser compound processing and modifying method of no-recasting-layer micro deep-hole
ActiveCN101332559AEfficient solutionSolve processabilityLaser beam welding apparatusLong-focus lensHigh power lasers
The invention discloses a laser combined machining and profile modification method of a micro deep borehole without a recast layer. The method of the invention includes the following steps: first, a micro deep cooling borehole of a turbine blade is roughly machined by high power laser or electric sparks, and the like; the allowance for finish of the aperture is more than the thickness of the recast layer produced by using the machining method; and femtosecond laser is used for the secondary finish machining and profile modification of the micro deep cooling borehole; while femtosecond impulse laser is used for performing the finish machining and profile modification of the primarily machined micro deep borehole, under the precondition of guaranteeing the laser energy acting with the recast layer of a workpiece is higher than the ablation threshold of the material, a light beam is inclined for certain angle according to the spiral drilling mode; and the recast layer of the internal wall of the borehole is machined to remove erosion and profile modification by combining the method of lengthening the focal depth by a long focus lens. The concept of the combined machining method and the specific machining technology are used for solving the high-efficiency and high-precision machining problems of micro deep borehole groups of turbine blades.
Owner:XI AN JIAOTONG UNIV
Superconducting nanowire single photon detector based on deep silicon etching process and preparation method
ActiveCN106549099AImprove absorption efficiencyReduce usageSuperconductor detailsSuperconductor device manufacture/treatmentLong-focus lensNanowire
The invention provides a superconducting nanowire single photon detector based on a deep silicon etching process and a preparation method. The detector comprises an SOI base which is composed of a back substrate, a buried oxygen layer and top silicon in sequence from bottom to top, a first anti-reflection layer which is disposed on the surface of the top silicon, a second anti-reflection layer which is disposed on the surface of the back substrate, a deep groove which penetrates through the second anti-reflection layer, the back substrate and the buried oxygen layer, an optical cavity structure which is disposed on the surface of the first anti-reflection layer, superconducting nanowires which are disposed between the first anti-reflection layer and the optical cavity structure, and a mirror which is disposed on the surface of the optical cavity structure. By etching the deep groove on the substrate, the distance between a coupling optical fiber and the device is narrowed, the use of a long-focus lens in the traditional back-coupling superconducting nanowire single photon detector is avoided, and alignment coupling between the MU head of an optical fiber and the device is facilitated. The problem concerning long-distance focusing in the optical cavity structure and the influence of the Fabry-Perot cavity of the susbtrate on the absorption efficiency are avoided. The absorption efficiency of target wavelength is improved. The detection efficiency of the device is improved.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Automatically focused remote iris image acquisition device, method and recognition system
ActiveCN101814129AExpand collection rangeAcquisition speed is fastTelevision system detailsCharacter and pattern recognitionCamera lensLong-focus lens
Owner:TIANJIN IRISTAR TECH LTD
Telephoto lens unit
InactiveUS20130094101A1Long distanceDifferent magnificationMountingsCamera body detailsTelephoto lensEyepiece
A telephoto lens unit (1) having a lens barrel that supports a telephoto lens and capable of being mounted on and dismounted from a camera body (16) comprises a front lens barrel section (11) that supports the telephoto lens with the subject side defined as the front, and a rear lens barrel section (13) that can be mounted on and dismounted from the front lens barrel section. The distance from the image-most surface of the telephoto lens to the image formation plane of the telephoto lens is kept sufficiently long. Converter lens units (12, 14) for elongating or shortening the focal distance are mounted on the front lens barrel section (11) instead of the rear lens barrel section (13) to provide interchangeable telephoto lenses for a camera having different focal lengths. Also, an erecting prism unit (15) and an eyepiece unit (17) can be connected instead of the rear lens barrel section to enable the telephoto lens to function as a terrestrial telescope.
Owner:KOWA CO LTD
Telephoto lens system and electronic apparatus having the same
InactiveUS20140300804A1Easy to processTelevision system detailsColor television detailsTelephoto lensLong-focus lens
A telephoto lens system and an electronic apparatus having the same are provided. The telephoto lens system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group. The third lens group includes a (3-1)-th lens group having a positive refractive power, a (3-2)-th lens group having a negative refractive power, and a (3-3)-th lens group having a positive refractive power.
Owner:SAMSUNG ELECTRONICS CO LTD
Bridge dynamic deflection facula imaging measuring device and method
InactiveCN102519383AAvoid distractionsCalculate dynamic displacementUsing optical meansLong-focus lensMeasurement device
Provided is a bridge dynamic deflection facula imaging measuring device and a method. A blue light-emitting diode (LED) lamp is arranged at the position of a deflection measure point of a structure to be measured, light is processed by a charge coupled device (CCD) in a photoelectrical coupling mode after passing through a filtering and central-long focus lens, optical signals of the deflection measure point of the structure to be measured are converted into picture signals to be transmitted to a computer which works out a location value of a facula corresponding to the LED lamp on a receiving screen, then the position value of the deflection measure point of the structure to be measured is calculated, and bridge dynamic deflection measurement in a bridge measurement and health monitoring process is achieved.
Owner:CHINA RAILWAY BRIDGE SCI RES INST LTD +1
Telephoto lens system
Provided is a telephoto lens system. The telephoto lens system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, which are arranged sequentially from an object side to an image side. Focusing is performed by moving the second lens group along an optical axis. The first lens group comprises (from object to image side) a positive lens having an object side surface whose radius of curvature is greater than that of an image side surface, a positive meniscus lens having a convex surface at the object side, a negative meniscus lens having a convex surface at the object side, and a positive lens having an object side surface whose radius of curvature is greater than that of an image side surface. The second lens group comprises (from object to image side) a doublet lens made up of a positive lens and a negative lens, and the third lens group comprises a doublet lens made up of a negative lens with a concave surface at the object side and a positive lens, and a positive lens.
Owner:SAMSUNG ELECTRONICS CO LTD
Arm extending type braking multi-CCD full-angle route inspecting robot
InactiveCN101670578ABrakes haveManipulatorApparatus for overhead lines/cablesLong-focus lensAutomatic control
The invention discloses an arm extending type braking multi-CCD full-angle route inspecting robot, comprising an on-line walk vehicle body part and an automatic control part. A drive wheel is providedwith a tightening brake device; the vehicle body is provided with a two-degree freedom rotation infrared camera device and a double-track extension mechanism; the double-track extension mechanism comprises a fixed perpendicular short-focus lens extension mechanism and a rotatable oblique long-focus lens extension mechanism; and the fixed perpendicular short-focus lens and the rotatable oblique long-focus lens are respectively provided with an automatic focusing mechanism. The automatic control part comprises a plurality of control modules to control the plurality of electric motors; the eachelectric motor is provided with a feedback element of a photoelectric encoder; and the plurality of the control modules are connected with each other by a CAN bus, to realize the closed loop feedbackcontrol of the plurality of the electric motors. When automatically walking on a ground wire of a high-voltage power transmission line, the robot has the functions of climbing, braking, arm extendingand multi-angle observing, automatic focusing and the like, and can be applicable to visual fault detection for a ground wire, a lead wire, a pole tower, ironware and the like, in the high-voltage overhead power transmission line.
Owner:北京深浪电子技术有限公司
Laser welding device and welding method
ActiveCN103170744AReduce focus driftFix focus driftLaser beam welding apparatusLong-focus lensThick plate
The invention discloses a laser welding device. According to the invention, the aggregating lens of a welding head is a long-focus lens, so that the welding head can be placed at a position far away from a welding pool during welding, the influence of thermal radiation of the welding pool on optical devices in the welding head can be reduced and the focus drifting of the aggregating lens is avoided; in addition, a first air blowing port of a side-blow protecting structure is capable of spraying protective gas into the welding pool during the welding and plasma above the welding pool can be blown away, so that the height of plasma flame can be reduced, the shielding effect of the plasma on laser beams is reduced and humps are avoided; and in conclusion, the laser welding device is capable of effectively improving the welding stability in a thick plate welding process. In addition, the invention also provides a welding method.
Owner:HANS LASER TECH IND GRP CO LTD
Telephoto lens system
A telephoto lens system includes a positive first lens group, a positive second lens group, a diaphragm, a negative third lens group constituting a focusing lens group, and a positive fourth lens group.The first lens group includes a positive first lens element, a positive second lens element, and a negative third lens element. The second lens group includes a negative or a positive fourth lens element and a positive or negative fifth lens element which are cemented to each other. The third lens group includes a positive or negative sixth lens element and a negative or positive seventh lens element which are cemented to each other. The fourth lens group includes one positive eighth lens element. Upon focusing on an object at infinity to an object at a closer distance, the third lens group is moved toward the image. The telephoto lens system satisfies the following conditions:1.4<f / f1<1.8 (1)2.4<f / f12<3.0 (2)−5.5<f / f3<−3.5 (3)wherein f: a focal length of the telephoto lens system; f1: the focal length of the first lens group; f12: the combined focal length of the first lens group and the second lens groups; and f3: a focal length of the third lens group.
Owner:RICOH IMAGING COMPANY
Image capturing apparatus and image smooth zooming method thereof
An image capturing apparatus and an image smooth zooming method thereof are provided. The image capturing apparatus includes a wide-angle lens and a telephoto lens having different sizes of field of view (FOV). In the method, a wide-view image and a tele-view image are respectively captured by using the wide-angle lens and the telephoto lens according to a zoom scale in a capturing setting. Ratios of the FOV sizes of the wide-angle lens and the telephoto lens to the zoom scale are respectively calculated and used to zoom the captured wide-view image and tele-view image so as to fit the zoom scale. The zoomed wide-view image and tele-view image are aligned according to a shift between view centers of the wide-angle lens and the telephoto lens. Finally, the zoomed and aligned wide-view image and tele-view image are overlapped to output an overlapped image fitting the zoom scale.
Owner:GUANGZHOU LUXVISIONS INNOVATION TECH LTD
High-precision focus detection device for long-focus lens
ActiveCN102313642ASimple structureRealize high-precision measurementTesting optical propertiesLong-focus lensGrating
The invention discloses a high-precision focus detection device for a long-focus lens, which comprises a laser, a microscope objective, a pin hole, a first Ronchi grating, the long-focus lens to be detected, a second Ronchi grating, ground glass and a CCD (Charge Coupled Device) camera. Light emitted by the laser passes through the microscope objective and the pin hole to form a divergent beam and the divergent beam enters the first Ronchi grating and then passes through the long-focus lens to be detected and the second Ronchi grating; the second Ronchi grating is placed at a certain talbot-order position of the first Ronchi grating, so that Moire fringes can be formed on a talbot image of the first Ronchi grating and the second Ronchi grating; and the fringes are acquired by the CCD camera and the focus of the lens to be detected can be obtained by calculating angles of the fringes. The high-precision focus detection device has a simple structure, is easy to implement, has high precision, can be used for detecting the long-focus lens and accurately measuring the focus in an optical system and particularly can be used for accurately measuring the focus of the large-caliber long-focus lens (the focus is in the range of meters and dozens of meters), so that an error caused by the scanning detection is avoided.
Owner:ZHEJIANG UNIV
Distant range iris recognition system and method
The invention discloses a distant range iris identifying system and a method thereof. The system includes: a camera / long focus lens for shooting eye image; a collecting card; a main control computer for collecting image by controlling the camera / long focus lens through the collecting card; a controllable clouds terrace for controlling the camera / long focus lens raising falling or left and righ rotary set on computer under controlled by the computer; a display / clew device for displaying the image collected by the camera / long focus lens or clewing under controlled by the main control computer; a height test sensor set on an identifying channel top for testing human height; an infrared source set on two sides of the channel door front for supplying light to image shoot; a singlechip control circuit for controlling the height testing sensor and the infrared source working. The system can shoot clear iris image continuously in distant range (beyond three meters) and identify which can increase practicability and enlarge application range for identifying iris.
Owner:TIANJIN IRISTAR TECH LTD
Dual-lens camera shooting machine
InactiveCN107396067AFlexible and efficient monitoringIncrease in sizeTelevision system detailsColor television detailsCamera lensTelephoto lens
The invention relates to the field of camera shooting equipment, in particular to a dual-lens camera shooting machine. According to the technical scheme, the dual-lens camera shooting machine comprises a wide-angle lens, the wide-angle lens is fixedly connected to a first bearing part, and dual-lens camera shooting machine is further provided with a telephoto lens which is connected to the first bearing part through a second bearing part, and both the first bearing part and the second bearing part can rotate in the vertical direction and the horizontal direction. The technical purpose is to provide the dual-lens dome-shaped camera shooting machine, both the wide-angle lens and the telephoto lens can rotate on a cloud deck, the range of a monitored picture is further enlarged, zooming tracking of a monitored object is also guaranteed, and the wide-angle lens and the telephoto lens are independent and do not interfere with each other.
Owner:ZHEJIANG DAHUA TECH CO LTD
Dual field-of-view optical imaging system with dual focus lens
ActiveUS20100214468A1Aberration correctionTelevision system detailsColor television detailsCamera lensWide field
A dual field-of-view optical imaging system is provided for obtaining two images of a scene, each image having a different field of view. The dual field-of-view optical imaging system includes a frontal dual focus lens, the dual focus lens having a central zone of focal length f1 producing a wide field-of-view image at a first focal plane and a peripheral zone of focal length f2 greater than f1 producing a narrow field-of-view image at a second focal plane; and a detector for detecting and acquiring the wide field-of-view image and the narrow field-of-view image, the detector being movable along an optical path for selective positioning at the first focal plane or the second focal plane.
Owner:THALES CANADA
Dual-camera shooting method and apparatus, storage medium and terminal
ActiveCN108377342AMotion Compensation ImplementationQuality improvementTelevision system detailsColor television detailsTelephoto lensLong-focus lens
The embodiment of the invention discloses a dual-camera shooting method and apparatus, a storage medium and a terminal. The method comprises the following steps: firstly determining a shooting main body in a preview image; secondly, tracking the shooting main body by using a telephoto lens to obtain first displacement information of the shooting main body; then, performing motion compensation on the telephoto lens according to the first displacement information; and finally, when a shooting instruction is triggered, obtaining a long-focus image according to the telephoto lens subjected to themotion compensation, and obtaining a wide-angle image according to the wide-angle lens; and generating a target image according to the long-focus image and the wide-angle image. The motion compensation can be performed on the telephoto lens, the target image is generated according to the wide-angle image obtained by the wide-angle lens and the obtained by the motion compensation, therefore dual-camera motion compensation is achieved, and the shooting image quality is improved.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Large-aperture-ratio internal focusing telephoto lens
InactiveUS20050248857A1Good optical performanceWider photographing areaOptical elementsTelephoto lensLong-focus lens
The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1 has at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.
Owner:NIKON CORP
Fixed-focus lens
A fixed-focus lens disposed between a magnified side and a minified side. The fixed-focus lens has an optical axis and includes a reflective system and a refractive system. The reflective system includes a reflection mirror with a negative refractive power. The refractive system is disposed between the reflection mirror and the minified side and includes a first lens group and a second lens group. The first lens group has a positive refractive power. The second lens group is disposed between the first lens group and the minified side, and has a positive refractive power. The fixed-focus lens satisfies F / H>0.23, where F is an effective focal length and H is an image height.
Owner:YOUNG OPTICS
Variable focal-length lens system
A variable-focus lens system that is small in size and permits attainment of high zooming ratio while maintaining high performance. In order from the object side, there are therein a first, positive lens group; a second, negative lens group; a third, positive lens group; a fourth, positive lens group; and a fifth, negative lens group; all of the lens groups move toward the object side in such fashion as to cause the distance between the first and second lens groups to increase, the distance between the second and third lens groups to decrease, the distance between the third and fourth lens groups to increase, and the distance between the fourth and the fifth lens groups to decrease, when the positional state of the lens changes from the extreme wide-angle state to the extreme telephoto state. At this time, the second lens group and the fourth lens group move in integral fashion during a change in the positional state of the lens, an aperture stop is arranged between the second and third lens groups, and the aforesaid third lens group moves during short-distance focusing. Suitable ranges for the widths of the second through fourth lens groups are defined by means of conditional expressions.
Owner:NIKON CORP
Multi-inclination angle full-length shot stabilizer
Owner:SHENZHEN MAKERSOAR TECH LTD
Telephoto lens system
A telephoto lens system including a first lens group having a positive refractive power and including at least three positive lenses and one negative lens; a second lens group having a negative refractive power and for performing focusing by moving along an optical axis; and a third lens group having a positive refractive power and including a 3a sub-lens group with positive refractive power and a 3b sub-lens group), wherein the 3a sub-lens group includes a negative lens and a positive lens sequentially arranged from an object side d, the 3b sub-lens group includes a positive lens and a negative lens sequentially arranged from the object side, and the telephoto lens system satisfies a condition, 0.17<fb / f<0.35, where, fb indicates a back focal length in air without a filter, that is, a distance from a lens surface of the telephoto lens system closest to the image side to an imaging surface with respect to the telephoto lens system having an optical arrangement at an infinite object position in air without the filter, and f indicates an overall focal length of the telephoto lens system.
Owner:SAMSUNG ELECTRONICS CO LTD
Telephoto lens system
A telephoto lens system includes a first lens group having a positive refractive power, and comprising at least three positive lenses and one negative lens; a second lens group having a negative refractive power, and which moves along an optical axis to perform a focusing operation; a third lens group having a positive refractive power, and comprising a cemented lens in which a positive lens having a convex surface toward the object side and a positive lens having a convex surface toward the image side are bonded to each other, a bi-convex positive lens, and a negative lens having a concave surface toward the object side, and the first through third lens groups are disposed sequentially from the object side to the image side.
Owner:SAMSUNG ELECTRONICS CO LTD
Telephoto camera calibration method based on polynomial projection model
InactiveCN102622744ALow noise immunityLow operational complexity requirementsImage analysisLong-focus lensExternal reference
The invention discloses a telephoto camera calibration method based on a polynomial projection model. Orthogonal projection models are mostly used in existing methods, focal length parameter limit is high, and an application range is narrow. The novel projection model is used for describing a projection process of a telephoto camera, points on an image are converted onto a spherical surface, and internal reference optimization is realized according to projection properties of straight lines on the spherical surface. External reference is solved by the aid of a projection relation among the points on the spherical surface and points on a calibration plate, and finally the internal reference and the external reference are optimized in a combined manner. The telephoto camera calibration method is generally applicable to telephoto lenses with different focal lengths, and has the advantages of high antijamming property, simple experimental facilities and high precision and flexibility.
Owner:ZHEJIANG UNIV
Lens system and lens
The invention discloses a lens system and a lens, which are used for solving the problem of imaging quality deterioration caused by using a VCM to realize focusing in the prior art. The lens system comprises a long-focus lens group and a liquid lens, wherein the long-focus lens group sequentially comprises a first fixed lens group and a second fixed lens group along an optical axis from the objectside to the image side; and the liquid lens is positioned at an arbitrary side of the long-focus lens group or between the first fixed lens group and the second fixed lens group along the optical axis direction. The liquid lens is arranged in the lens group, the effect of variable focal length can be realized just by changing voltages at two sides of the liquid lens without moving lenses in the long-focus lens group, and the sharpness of imaging can be ensured.
Owner:HUAWEI TECH CO LTD
Long-wave infrared two-speed viewing field tracking measurement lens
ActiveCN101943608AWide range monitoringImprove detailed monitoringRadiation pyrometryMountingsCamera lensLong-focus lens
The invention relates to a long-wave infrared two-speed viewing field tracking measurement lens comprising a main lens cone. The long-wave infrared two-speed viewing field tracking and measuring lens is characterized in that the main lens cone is internally provided with a just crescent fixed lens A, a switching lens group B and a just crescent focusing lens C along an incident direction of infrared light from left to right, wherein the just crescent focusing lens C is driven by a focusing mechanism arranged in the main lens cone; the switching lens group B is divided into a long-focus lens group B (long) used during a long lens focus and a short-focus lens group B (short) used during a short lens focus, and the long-focus lens group B (long) or the short-focus lens group B (short) is driven by a switching rotation mechanism arranged in the main lens cone to be on a same light path with the just crescent fixed lens A and the just crescent focusing lens C. The invention has long designed focus of the lens, can conveniently switch the two-speed viewing field lens and enable a thermal imaging system to carry out tracking measurement on a long-distance target, can not only carry out large-area low-magnification approximate observation on the long-distance target, but also carry out small-area high-magnification detailed observation on the long-distance target.
Owner:FUJIAN FORECAM OPTICS CO LTD
Single-focus lens
A single-focus lens includes from the object side, a first lens with a positive refracting power having at least one aspheric surface, a stop, a second lens with a negative refracting power, and a third lens with a positive refracting power having at least one aspheric surface. This single-focus lens further satisfies the conditional expression of 0.3<f / f2'3<0.8, where f is the focal length of the lens as a whole, and f23 is the composite focal length of the second and third lenses.
Owner:TIANJIN OFILM OPTO ELECTRONICS CO LTD
Application method of long-focus shooting ptz camera system free of repeated zooming viewfinding
InactiveCN108429881ARealize no repeated zooming and framingImprove shooting efficiencyTelevision system detailsColor television detailsLong-focus lensHandling system
The invention relates to an application method of a long-focus shooting ptz camera system free of repeated zooming viewfinding The application method is characterized in that on the basis of a conventional ptz camera, a wide-angle fixed-focus camera is installed right above the main camera, and the function of the long-focus shooting ptz camera system is achieved through the following steps: S1, protocol development of the main camera and the wide-angle fixed-focus camera is completed; S2, a processing system of the main camera is operated to carry out processing on two paths of video signals;S3, a zooming frame is added to the wide-angle picture by operating the processing system of the main camera, and a dual-camera system with calibration finished becomes a module; and S4, viewfindingand shooting are carried out. According to the method in the invention, when zooming is carried out in the shooting process, if a long-focus lens target object shot by the long-focus camera is lost, the long-focus state does not need to be exited, only the zooming frame needs to be moved to the target object, and the target object can appear in the picture of the long-focus lens; after the currenttarget shooting is finished, only the zooming frame on the wide-angle picture needs to be moved to a next target, so that repeated zooming-free viewfinding is achieved, and the shooting efficiency and the shooting effect are improved.
Owner:山东超景深信息科技有限公司
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