198 results about "Axis distance" patented technology

The stereoscopic microscope includes a common close-up optical system that faces an object, a pair of zoom optical systems that form a pair of primary image, a pair of field stops, a pair of relay optical systems that relay the primary images to form a pair of secondary images, an inter-axis distance reducing element, an image taking device and an illuminating optical system. The object light rays incident on the close-up optical system form the primary images having predetermined parallax at the field stops through the zoom optical systems. The inter-axis distance reducing element reduces the inter-axis distance of the right and left light rays. The primary images are re-imaged by the relay optical systems as the secondary images on the adjacent regions on the single image taking surface of the image taking device, respectively.

The invention provides an apparatus and method for detecting the multiple optical axis consistency of a platform photoelectric instrument. The detection method comprises a detection host, a support mechanism and a data control processing system. A catadioptric optical collimating system,a multiband target plate and a target light source are adopted for determining the axial direction of each optical system, a CCD aiming assembly is utilized for acquiring the image of the same fixed target in a distant scene, afterwards, an image processing module performs pretreatment, coupling and optical axis parallelism calculatingon the image by using a template coupling method so that the position deviations of the same fixed target in different images is obtained and a detection result of the light axis consistency among the multiple optical systems can be further obtained. The apparatus is free from the axis distance restrictions among optical sensors, no cooperation targets and no calibration adjustment are needed, the detection precision is high, the volume is small, the weight is light, the operation is convenient, and the automation degree is high, therefore, the apparatus and method well satisfy the on-line rapid detection needs for detecting the multiple optical axis consistency of the platform photoelectric instrument in a field environment.

The invention discloses a detection device for a laser rangefinder, composed of a sampler, an absorber, a multi-target simulator, a standard target and a variable diaphragm. The laser rangefinder emits a laser directed at the detection device; the sampler and the multi-target simulator simulate a laser target echo, and obtain an receiving optical axis and the minimum detectable power of the laser rangefinder via the maximum distance ranging result; a laser emitting optical axis and a collimation optical axis are corrected via a laser spot position and an axis distance; and the emission and the receiving of the laser rangefinder are quantitatively associated, in order to realize a ranging capacity evaluation of the laser rangefinder. The device disclosed by the invention has no need to be supplied with power, and is simple in operation and low in cost.

There is provided an urging mechanism that elastically urges a second end portion of a worm shaft that is supported so as to be pivotable about a first end portion. The urging mechanism is configured to adjust a backlash between the worm shaft and a worm wheel by elastically urging the second end portion in a perpendicular direction that is perpendicular to a direction in which an inter-axis distance between the worm shaft and the worm wheel increases and decreases, in a state where increases and decreases in the inter-axis distance is prevented.

A method for measuring dimensions of objects by a touch screen includes steps of 1) calculating X-axis distance conversion coefficient C1 and Y-axis distance conversion coefficient C2, 2) using a touch pen to click two endpoints of a distance to be measured, 3) using the touch screen to transmit position coordinate signals (X1,Y1) and (X2,Y2) of the two endpoints to a central processing unit by electric conversion, 4) calculating actual physical dimensions D of the two endpoints by the central processing unit, and 5) outputting the actual physical dimensions D to an output device or a memory. Compared with the method for measuring dimensions of objects by the touch screen, a method for measuring angles of objects by the same includes using the touch pen to click three points of an angle to be measured according to the sequence of edge, angle and edge to calculate the included angle. The invention combines the digital processing technology and a digital display method, expands the application of the touch screen, and is convenient in use. Users can measure the dimensions and the angles of objects just by simple operations on the touch screen.

A revolving sprinkler comprises a rotatable turret assembly revolving around a rotation axis and formed with mouthpiece(s) suited to sprinkle liquid under pressure. The revolving sprinkler accommodates exchangeable mouthpieces with different throughputs—nozzle to rotation axis distance relationships, without changing a rotation velocity of the turret assembly.

An optical lens system for taking image comprises, in order from the object side to the image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a plastic second lens element with negative refractive power having a concave object-side surface, a convex image-side surface and at least one aspheric surface; a plastic third lens element with negative refractive power having a convex object-side surface, a concave image-side surface and at least one aspheric surface. The number of the lens elements with refractive power being limited to three. Focal lengths of the optical lens system, the first lens element, the second lens element and the third lens element are f, f1, f2, f3 respectively; Abbe numbers of the first and second lens elements are V1, V2 respectively, an on-axis distance between second and third lens elements is T23, and they satisfy the relations: 0.8<f/f1<1.8; 0<|f/f2|<0.8; 0<|f/f3|<0.7; 20<V1−V2<38; 0.13<T23/f<0.21.

A radiation beam analyzer for measuring the distribution and intensity of radiation produced by a Cyberknife®. The analyzer employs a relative small tank of water into which a sensor is placed to maintain a constant SAD (source to axis distance). A first method maintains a fixed position of detector, and raises or lowers the small tank of water. A second method moves the detector up, down or rotationally synchronously in opposite directions with respect to the small tank of water to keep the SAD constant. These methods position the detector relative to the radiation source to simulate the location of a malady within a patient's body. An embodiment of the present invention enables measurements of substantially larger fields. This is accomplished by rotating a tank of water 90 degrees from a first position to a second position

An eyeglass lens processing apparatus includes: a lens rotation unit rotating a lens; a processing tool rotation unit processing the lens; an axis-to-axis distance changing unit for changing an axis-to-axis distance between the chuck shaft and the processing tool rotation shaft; a lens surface configuration acquiring unit which acquires a front surface curve configuration and a rear surface curve configuration of the lens; a lens outer diameter acquiring unit which acquires an outer diameter of a lens; a calculation unit which calculates a thickness of the lens and calculates a cutting depth of the lens, so that torque applied onto the chuck shaft in rough processing becomes substantially constant, based on the calculated lens thickness and a processing distance from the rotation center of the lens; and a control unit which controls the axis-to-axis distance changing unit in accordance with the calculated cutting depth and for rough processing the lens.

The invention provides an eyepiece. The eyepiece is successively provided with a first lens with positive focal power and a convex object side and a second lens along the optical axis from the object side to the image side. The second lens has a concave image side. At least one of the object side of the first lens, the image side of the first lens, the object side of the second lens and the image side of the second lens is a Fresnel structure plane. The maximum half field angle HFOV of the eyepiece is greater than 40 degrees. According to the on-axis distance TTL from the object side of the first lens to an imaging face and the total effective focal length f of the eyepiece, 1<TTL/f<1.5. According to the total effective focal length f of the eyepiece and the on-axis distance TD from the object side of the first lens to the image side of the second lens, 2<f/TD<5. According to the effective radius DT11 of the object side of the first lens and the effective radius DT21 of the object side of the second lens, 2.7<DT11/DT21<1.

Disclosed is a fixing unit of an image forming apparatus, the fixing unit including a first roller; a second roller which forms a nip together with the first roller; and a nip adjuster which is provided in at least one end part of the first roller and includes a restrictive ring formed with a plurality of cam profiles for regulating an axis distance between the first roller and the second roller to be varied to adjust a width of the nip.

The invention relates to a method for eliminating unbalanced force of a single-blade pump impeller. The method is characterized by comprising a step of determining a blade gravity shifting angle (1), non-thickening gravity position (2), a thickening central line (3), a single side thickening range (4), a thickening starting line (5), a thickening ending line (6), a thickening radius starting point derivation axes distance (7), a hub thickening radius (8) and a hub thickening thickness (9). Based on a key point, when the blade is designed, unbalance of the single-blade pump impeller is considered; solid modeling is performed to the blade by a three-dimensional modeling software PROE; a gravity position is found in the software so as to count a derivation angle; the hub is thickened or the blade is thickened on a position opposite to the gravity position; by dint of a pre-accentuation method, weighted quality can be estimated; data is fed back to an impeller mould; therefore, the impeller achieves quality balance initially.

The invention discloses a fixed-focus optical system which successively comprises seven lenses from the object side to the image side, wherein the first lens is provided with negative power, a objectside convex surface and an image side convex surface; the second lens is provided with negative power, a object side convex surface and an image side convex surface; the third lens is provided with positive power and double convex surfaces; the image side surface of the fourth lens is a convex surface, when the focal power is positive, C4o is greater than or equal to 0, and the C4o is the curvature of the object side face of the fourth lens; when the focal power is negative, the object side face of the fourth lens is a concave surface; the fifth lens is provided with positive power and doubleconvex surfaces; the sixth lens is provided with negative powder and two concave surfaces; the seventh lens is provided with positive power and double convex surfaces; and the relationship is met: Imeg/f is greater than 1.28 but less than 2.22, and Imeg/TTL is greater than 0.105 but less than 0.167, wherein Imeg is the highest half image height, TTL is the axis distance from the object side face of the first lens to the image side face, and f is system focal distance. The system has the advantages that the power is reasonably matched; by means of reasonable parameter matching, a miniature optical system design which is high in resolution, good in image quality and low in cost is achieved.

The invention discloses a double-eccentric bushing regulating device for the rotation balance of a high-rotating-speed polishing head. The double-eccentric bushing regulating device is applied to the driving and high-speed polishing processing of optical elements with medium and large calibers, a small eccentric bushing, a large eccentric bushing and a cylinder body form a double-eccentric bushing structure for regulating the eccentricity, and an eccentric hole per se (a matched and connected position of the small eccentric bushing and the cylinder body) is driven to do revolution movement around an axial line of a main shaft in the rotating process of the small eccentric bushing; through the relative rotation, the relative circumference position of the small eccentric bushing and the large eccentric bushing is regulated, the axis distance between the small eccentric bushing and the large eccentric bushing is changed, the polishing distance is regulated, and a polishing disc can obtain different revolution radii for adapting to the polishing requirements of different workpieces; and in the eccentric distance regulating process, the whole mass gravity center is always on the rotating center of the main shaft. When the structure is adopted, greater centrifugal force cannot be generated in the polishing rotation process, the rotary movement stability is ensured, and the rotating speed of the rotary polishing head can be improved, so the polishing efficiency of a polishing machine is improved.

A charged particle beam microscope device of the present invention is configured such that in a diffraction pattern obtained by radiating a parallel charged particle beam onto a sample (22) having a known structure, a distance (r) between spots of a diffraction pattern, which reflects the structure of the sample, is measured, and the variation of a distance (L) between the sample and a detector, which depends on a diffraction angle (θ), is corrected. This enables the correction of distortion that varies with an off-axis distance from the optical axis in a diffraction pattern, and a high precision structural analysis by performing accurately analyzing the spot positions of the diffraction pattern.

The invention discloses a chain link assembly, a chain and a film stretching device. Transition chain links are arranged in the chain link assembly, conventional chain links can be folded in the radial direction, the axis distance between the adjacent transition chain links is changed while folding is carried out, the chain link assembly is arranged in the chain, clamps for clamping a film are arranged, the length of the chain of the film stretching device is changed wholly along with bending deformation of the chain link assembly, and accordingly the distance between the adjacent clamps is reduced; when transverse stretching is carried out, the clamping gap between the clamps shrinks, and the aim of longitudinal retraction is achieved while the transverse pulling process is carried out; and when the film stretching device caries out film transverse stretching work, longitudinal tensile force of the film is reduced under the high-temperature state, the film can be sufficiently and longitudinally pre-retracted, and the problem that the longitudinal shrinkage ratio is too large is solved in advance.

A radiation beam analyzer for measuring the distribution and intensity of radiation produced by a CyberKnife®. The analyzer employs a relative small tank of water into which a sensor is placed. The distance between the sensor and the radiation source is not varied. The tank of water is raised and lowered relative to the sensor to simulate the location of a malady within a patient's body. This movement of the tank permits the radiation from the CyberKnife® to be properly calibrated and adjusted for a proper treatment of a malady in a patient. In a second embodiment a radiation beam analyzer measures the distribution and intensity of radiation produced by a radiation source. The analyzer employs a relative small tank of water into which a sensor or detector is placed. The distance between the sensor and the radiation source is not varied. There are two methods to maintain the SAD (source to axis distance) constant. A first method maintains the position of detector fixed, utilizing a holder designed to retain the detector, and raises or lowers the small tank of water. A second method moves the detector up or down with a raising and lower mechanism in one direction and synchronically moves the small tank of water in the opposite direction with another raising and lowering mechanism. The second method also keeps the SAD constant. These methods position the detector relative to the radiation source to simulate the location of a malady within a patient's body. This movement of the tank permits the radiation from the radiation beam source to be properly isocentrically measured.

An aortic cross clamp includes an elongated handle and a clamp head. The clamp head has opposing jaws having open and closed positions. At least one of the jaws is pivotally mounted to a jaw actuator so as to be pivotal relative to the opposing jaw and about an axis distanced from the opposing jaw. A locking mechanism is provided for locking the jaws in the closed position. A jaw drive mechanism is operable through the elongated handle for moving the jaws between the open and closed positions. A method of clamping the aorta is also disclosed.