Abstract:
A profile measuring instrument usable to perform a rotary scanning measurement and a linear scanning measurement on a workpiece in the form of a revolution solid, includes: a turntable on which the workpiece is mounted, the turntable being rotatable around a predetermined rotation axis; a rotary scanning measurement unit being adapted to measure a displacement of a surface of the workpiece mounted on the turntable; a linear scanning measurement unit being adapted to measure a profile of the surface of the workpiece mounted on the turntable along a predetermined measurement axis; and an aligning mechanism being adapted to relatively move the linear scanning measurement unit and the turntable in a direction intersecting with the measurement axis. The linear scanning measurement unit and the turntable are adjusted to relative positions at which the measurement axis passes through the rotation axis.
Abstract:
In a method of generating a three-dimensional (3D) model, a computing device enters measurement data including measurement point group data obtained from measurement of a measured object, a type of surface element, and a geometry value of a surface element; calculates an error of the measurement data based on the surface element specified by the measurement data; determines whether the calculated error is within a predetermined tolerance; corrects the surface element by the error when the error is within the tolerance; and obtains intersection data of the surface elements and outline data of each surface element from the corrected surface elements to generate a 3D model.
Abstract:
An optical encoder includes a detection head. The detection head includes an optical system including a lens including a pair of bosses integrally formed with the lens and disposed with an optical axis of the lens therebetween, and an aperture plate having a pair of reference-pin-insertion holes disposed with an aperture therebetween; a housing including a pair of attachment portions and having a pair of lens-boss-insertion holes and a pair of reference-pin-insertion holes disposed on a central symmetry plane; a lens holder having a pair of lens-boss-insertion holes and a pair of reference-pin-insertion holes disposed on the central symmetry plane; and a pair of reference pins for positioning the lens holder and the aperture plate relative to the housing. An optical axis of the optical system is adjusted with respect to the bosses and the reference pins.
Abstract:
A computation & control unit defines, as first and second voltages, A+B_signal voltages at distances which give the maximum and minimum voltages of an S_signal voltage, respectively. The unit further defines the higher one of the first and second voltages as an S_signal validity determination voltage and defines a distance at which the S_signal voltage takes on an in-focus determination voltage. The unit defines first and second lower limit voltages, defines the higher one of the first and second lower limit voltages as a lower limit voltage, and defines, as an upper limit voltage, an A+B_signal voltage at a distance which gives an in-focus determination voltage between the maximum and minimum positions of the S_signal voltage. An input and output unit outputs the upper and lower limit voltages as the upper and lower limit values of a settable range of the S_signal validity determination voltage.
Abstract:
The adapter correcting for glass thickness includes an adapter main body, a plane parallel plate, and a retainer. The adapter main body includes an attacher/detacher capable of attaching and detaching with respect to an adapter connecter on the lens barrel; a tubular accommodator extending from the attacher/detacher toward the objective along an optical axis of the field lens; and a tongue provided on the attacher/detacher side of the accommodator. The plane parallel plate includes two mutually parallel flat surfaces and is inserted into the accommodator such that the two flat surfaces are orthogonal to the optical axis of the field lens. The retainer is attached to an end of the accommodator closest to the objective and holds the plane parallel plate between the retainer and the tongue. The accommodator is formed to have a tubular length sufficient to insert at least two plane parallel plates.
Abstract:
A white-light interferometric measuring device includes: a white light source that emits a white light beam; a beam splitter that reflects the white light beam; and an interference objective lens that collects the white light beam having reflected off the beam splitter in the direction of an optical axis and irradiates a measurement workpiece with the white light beam, the interference objective lens generating interference between a measurement light beam obtained by reflection of the white light beam off the measurement workpiece and a reference light beam obtained by branching of the white light beam to be converged on the measurement workpiece. Polarization correcting means that corrects the white light beam to enter the interference objective lens to circularly polarized light is arranged between the white light source and the interference objective lens.
Abstract:
A photoelectric encoder includes an irradiation unit configured to apply first and second irradiation light beams having a first linear polarization direction, a scale configured to produce first and second diffraction light beams having the first linear polarization direction by diffracting the first and second irradiation light beams, respectively, the scale having a glass plate whose front surface has a grating shape, a polarizing unit configured to convert the first diffraction light beam into a third diffraction light beam having a second linear polarization direction which is perpendicular to the first linear polarization direction, to produce first and second composite light beams by combining the second diffraction light beam and the third diffraction light beam, and to convert the first composite light beam into a circularly polarized third composite light beam, and a light receiver configured to receive the second composite light beam and the third composite light beam.
Abstract:
A method for determining saturated absorption lines includes defining first and second threshold values based on an output value of a light output signal. The first and second threshold values are in a magnitude relationship. An output value of a second-order differential signal of the light output signal is compared with the first and second threshold values. A determination is made as to whether the second-order differential signal following a change in a resonator length has an output waveform that displays a behavior in which the output waveform changes from less than the second threshold value to be equal to or greater than the first threshold value, and then changes to be less than the second threshold value. Based on a result of the determination by the waveform determination, a determination is made as to whether the output waveform of the second-order differential signal is the saturated absorption line.
Abstract:
A measurement coordinate correction method correcting the measurement coordinates of a work piece placed on a base, in which the measurement coordinate correction method includes a weight acquiring step, a position acquiring step, and a correcting step. The weight acquiring step acquires information related to the weight of the work piece. The position acquiring step acquires information related to the position of the work piece on the base. The correcting step corrects the measurement coordinates of the work piece based on the weight and position of the work piece.
Abstract:
An image sensor for fringe images of interference fringes and the like in which the optical system has a simpler configuration than that of the conventional line image sensor, and faster detection becomes possible includes a light receiving plane on which two or more straight rows of pixels are disposed, and captures images of regular fringes generated from light reflected from an irradiated body in accordance with the amount of light received by each pixel; among the rows of pixels, at least two rows of pixels are disposed at right angles to each other, and acquires images of linear fringes crossing almost at right angles in two directions among the fringe projected onto the light receiving plane.