Disclosed is a reflective encoder which is capable of measuring movement amount and detecting movement direction by using one emergent light beam, and achieving high reliability and miniaturization through a simple structure. In the reflective encoder, a light beam emitted by a laser oscillator is caused to be incident on a reflective diffraction grating disposed on a side of a scale, and diffracted light beams reflected by the reflective diffraction grating are received by light receiving elements. An interference optical system is provided between the light receiving elements and the reflective diffraction grating. An optical system is thus constructed to measure movement amount and detect movement direction by using only one emergent light beam.

Alignment of a near field transducer (NFT) optical input coupler and a light emitting device involves providing excitation radiation from an excitation light source through an optical input coupler to the NFT and filtering output radiation from the NFT using a short wavelength pass optical filter. The optical input coupler is scanned through multiple positions while the photoluminescent radiation is detected. A first alignment position between the NFT input coupler and the excitation light source is identified based on the detected photoluminescent radiation. A light emitting device is scanned through multiple positions the light output is detected by a detector. A second alignment position between the light emitting device and the detector is identified. The first and second alignment positions are used to align the light emitting device with the optical input coupler.

A method for determining information about an object including a curved portion and a planar portion, the curved portion having a first curved surface having an apex and defining an axis of the object, includes: directing measurement light to the object; detecting measurement light reflected from the first curved surface of the curved portion; detecting measurement light reflected from at least one other surface of the object; and determining, based on the detected light, information about the apex of the first curved surface of the curved portion.

A concentric circle adjusting apparatus for a multiple image capturing device is disclosed, where a first and second correction angles for correcting a first and second image capturing devices are respectively calculated by a control device according to a link length of a standard link, a first angle, a second angle, a first distance, and a second distance, respectively, so that a first and second platforms are controlled according to the first and second control commands to rotate the first and second image capturing device by the first and second correction angles, respectively, whereby the efficacy of an increased visible range and a rapid calibration may be achieved.

A concentric circle adjusting apparatus for a multiple image capturing device is disclosed, where a first and second correction angles for correcting a first and second image capturing devices are respectively calculated by a control device according to a link length of a standard link, a first angle, a second angle, a first distance, and a second distance, respectively, so that a first and second platforms are controlled according to the first and second control commands to rotate the first and second image capturing device by the first and second correction angles, respectively, whereby the efficacy of an increased visible range and a rapid calibration may be achieved.

The wavefront aberration measuring method includes measuring an intensity distribution of a measuring light transmitted through or reflected by an object to be measured, by using a light-receiving sensor, calculating a first differential wavefront which is a differential wavefront of the measuring light on the light-receiving sensor, and calculating a second differential wavefront by performing a correction process on the first differential wavefront depending on an incident angle of the measuring light to the light-receiving sensor. The method further includes calculating a wavefront aberration of the object by using the second differential wavefront.

A method and device for measuring a decentration and tilt of faces of an optical element is provided. At least all optically used and frame-relevant partial surfaces of a surface of the optical element and reference faces of the optical element are registered over the whole area thereof and referenced to one another in a common coordinate system, wherein in each case a surface form deviation of the partial surfaces and reference faces is established relative to an associated intended surface, wherein a location of the partial surfaces and reference faces is established in each case in the common coordinate system from the respective surface form deviation. At least one tilt and at least one decentration are established from the location as a function of a form of the respective partial surface and reference face in the coordinate system.

A device positioning an object according to a given direction, including a frame, a holder for holding the object, the holder being movable relative to the frame according to the given direction, a main lever extending between a first point and a second point, said main lever being rotatably mounted to the frame via a first pivot link connecting the main lever and the frame at the first point of the main lever, the main lever being connected to the holder at a third point which is arranged between the first point and the second point, so that a displacement of the second point of the main lever relative to the frame according to the given direction causes displacement of the holder in said given direction.

A method of requalifying a die after storage under this disclosure could be said to include the steps of running production parts on a die, stopping production for a period of time, taking a pre-storage 3D scan of the die, storing the die for a period of time, taking a post storage 3D scan of the die, comparing the post storage 3D scan information to the pre-storage 3D scan information, and requalifying the die for use in production should the post storage 3D scan be found to be sufficiently close to the pre-storage 3D scan.

A lensmeter capable of measuring near-infrared ray transmittance of an eyeglass lens by adding a near-infrared ray measurement function to the lensmeter. The lensmeter includes a near-infrared ray transmittance measuring unit that includes a light emitting unit including a near-infrared ray light source for irradiating a measured lens with a near-infrared ray; and a light receiving unit including a near-infrared ray sensor for measuring a near-infrared ray transmittance of the measured lens by detecting an intensity of the near-infrared ray passing through the measured lens, and is located at one end of a housing of the lensmeter.