Sony Precision Technology Inc.

Sony Corporation

Dmg Mori Company Limited

Dmg Mori Seiki Co., Ltd.

Sony Magnescale Inc.

Mori Seiki Co., Ltd.

Sony Magnescale Incorporation

Sony Manufacturing Systems Corporation

Magnescale Co., Ltd.

Kayoko Taniguchi

Hideaki Tamiya

Akihiro Kuroda

Hidehiro Kume

Hideki Tsuchiya

Kenji Matsushita

Akinori Suzuki

Masayuki Niiya

Terukazu Nishida

Eiko Kanbara

Masaaki Kusumi

Shigeru Ishimoto

Akihito Nakayama

Shigeaki Maruyama

Chihiro Murayama

Akitaka Hiruta

Takao Yukawa

Masaaki Toyama

Masahito Kon

Yasuhiko Onodera

Nobuo Nabeshima

Data is utilized more efficiently and effectively. A position detection device includes a plurality of scales that each record absolute data embedded with a scale ID for identifying a scale, a detector that detects the absolute data from each of the plurality of scales, and an extractor that extracts, from the detected absolute data, the scale ID and position data representing the position of the scale.

Position detection device and conveyance device

A displacement detection device is capable of stably and accurately detecting an amount of displacement. A polarization maintaining fiber has a length not to be equal to a length obtained by dividing, a product of an integral multiple of twice a length of a resonator times a refractive index of the resonator and a beat length obtained from a difference between propagation constants of two polarization modes, by a wavelength of the light source, is selected from a range including a length equal to the above length. The polarization maintaining fiber includes multiple polarization maintaining fibers fitted to each other by removable connectors.

Displacement detection device

A scale device includes a scale main body having at least two incremental tracks, at least two or more incremental signal detection heads for detecting incremental signals from the incremental tracks, and an operation processing unit that generates, based upon detection outputs by the two or more incremental signal detection heads, relative positional information in a measuring direction of a measuring axis and parallel movement amount information in a direction orthogonal to the measuring direction.

Scale measuring device, method for generating position information, and device with multi-axis stage

A displacement detection apparatus capable of stably and accurately detecting the amount of displacement. The length of a polarization maintaining fiber for transmitting the light from a light source to a displacement detector is set not to be equal to a length obtained by dividing, by the wavelength of the light source, a product of an even integral multiple of a length, which is obtained by multiplying twice the length of a resonator by the refractive index of the resonator, and a beat length obtained by a difference between the propagation constants of two polarization modes. Alternatively, the length of the polarization maintaining fiber is set to be larger than a length, which is obtained by dividing, by the wavelength of the light source, a product of a coherence length and a beat length obtained from a difference between the propagation constants of two polarization modes.

Displacement detection apparatus

A displacement detecting device includes a non-contact sensor having a light source, an objective lens focusing output light from the light source onto a measurement surface, and a light receiving element detecting displacement information based on a focal length of the objective lens by using reflected light from the measurement surface; a control unit adjusting the focal length based on the displacement information; a displacement-amount measuring unit having a linear scale attached to the objective lens with a link member therebetween and measuring an amount of displacement of the linear scale when the focal length is adjusted. A light adjustment member is disposed between the light source and the objective lens or between the objective lens and the light receiving element and has an aperture section transmitting the output and/or reflected light therethrough and a light blocking section that blocks a specific light component of the output and/or reflected light.

Non-contact displacement detecting device using optical astigmatism

Disclosed is a displacement measuring apparatus that includes a composite scale having a magnetic pattern and a diffraction grating each aligned in a direction of measuring axis, and a detector head moving in a direction of measuring axis relative to the composite scale. The detector head has a magnetic detection unit detecting a magnetic field exerted by the magnetic pattern to generate first reproduced signals, a light source irradiating the diffraction grating with light, and an optical detection unit detecting the light diffracted by the diffraction grating to generate second reproduced signals. In composite scale, the magnetic pattern and the diffraction grating are arranged such that a pitch of the first reproduced signals is larger than that of the second reproduced signals.

Displacement measuring apparatus

A displacement detection device having excellent stability with the lapse of time and suitable for reduction in size and weight includes: a light source for emitting light; polarizing light splitting unit for splitting the light emitted from the light source into two light beams having difference polarized components, radiating the two light beams to an external optical system, and combining the two light beams reflected by the external optical system to generate combined light; a phase plate provided between the light source and the polarizing light splitting unit and adapted for changing the polarization state of the light emitted from the light source and leading the light to the polarizing light splitting unit; light splitting films for splitting the combined light generated by the polarizing light splitting unit into plural light beams; polarizing units for transmitting only a predetermined polarized components of the split combined light beams; and light-receiving elements for photoelectrically converting coherent light beams transmitted through the polarizing units and thus generating an interference signal.

Light-receiving/emitting composite unit, method for manufacturing the same, and displacement detection device

The present invention provides a displacement detection apparatus uses short scales and can provide a long measurable range comparable to a single long scale with a short bed length. The displacement detection apparatus includes a scale, a first head and a second head adapted to detect periodic analog signals of a plurality of different types, a first processing section and a second processing section that detects the first differential value and the second differential value between the immediately preceding positional data and the current positional data obtained by sampling the periodic analog signals of a plurality of different types, a switching section that selectively switches from the first differential value to the second differential value or vice versa, a scale position detection section that detects the scale getting to a predetermined position relative to the first head or a predetermined position relative to the second head, a switching control section that causes the switching section to switch from either of the differential values to the other in response to the detection of the scale getting to the predetermined position, and an addition section that adds the first differential value or the second differential value selectively switched by the switching control section and outputting it as positional information.

An information writing device in which the information can be written accurately efficiently and in which variable formats of the disc-shaped recording mediums can be coped with without the necessity of providing master discs from one format of the disc-shaped recording medium to another. A grating interferometer clock scale system is formed by a clock pattern dischaving a clock trackcarrying an optically readable clock patternand an optical headfor optically reading out the clock pattern. Clock signals are generated in a clock generator, to which is transmitted, via an optical fiber, the interference light obtained as an optical output obtained in turn by optically reading out the clock patternby the optical head, based on electrical signals obtained on photoelectrically transducing the optical output. The servo information synchronized with the clock signals is generated by a servo information generating part

Information writing device

A displacement pickup is provided which includes a displaceable scale () having defined therein a first area () where positional information is recorded with a predetermined pitch and a second area () where positional information is recorded with a predetermined pitch different from that in the first area (), a first reading system () to read the positional information recorded in the first area (), a first phase detector () to detect a first phase on the basis of the positional information read by the first reading system (), a second reading system () to read the positional information recorded in the second area (), a second phase detector () to detect a second phase on the basis of the positional information read by the second reading system (), a phase comparator () to make a comparison between the first and second phases, and an origin signal generator () to generate an origin signal according to the result of comparison from the phase comparator ().

Displacement pickup

The present invention provides a light emitting/receiving composite unit () for emitting and receiving lights, which includes a light source (), an optical splitting unit () for splitting returning lights to the composite unit () into a plurality of lights, a polarizing unit () for increasing and decreasing quantity of lights transmitted therefrom corresponding to polarization state of the returning lights, and an optical receiving unit () which has a plurality of photo-detecting elements (to) for detecting the lights transmitted through the polarizing unit (), which are unitedly integrated into one unit. Also, the present invention provides a displacement detection apparatus of grating interference type, which includes thus unitedly integrated composite unit (), and an external optical system of an objective unit having a reflection type diffraction grating RG, a reflecting unit (R, R) for reflecting lights from the composite unit () to the reflection type diffraction grating RG, a polarizing unit (WP, WP) for changing polarization state of diffracted lights from the reflection type diffraction grating RG, and a reflecting unit (R, R) for reflecting lights transmitted through the polarizing unit (WP, WP) to cause the reflected lights go backward.

Light-emitting/receiving combined unit and displacement sensors using the same

A displacement pickup is provided which comprising a scale () having defined thereon a first area () where positional information is recorded with a predetermined pitch and a second area () where positional information is recorded with a pitch different from that in the first area (), a first reader () which reads the positional information recorded in the first area (), a first phase detector () which detects a first phase on the basis of the positional information read by the first reader (), a second reader () which reads the positional information recorded in the second area (), a second phase detector () which detects a second phase on the basis of the positional information read by the second reader (), a phase comparator () which makes a comparison between the first and second phases, and an origin signal selector () which produce a plurality of signals according to the result of comparison and selects an arbitrary one of the plurality of signals on the basis of the positional information read by the first reader ().

A disc recording and/or reproducing apparatus has a scale movable along with a magnetic head radially of a magnetic disc provided in the disc recording and/reproducing apparatus and which has recorded thereon readable by a laser light position information indicative of the radially moving position of the magnetic head. The position information indicates a smaller range than the radial length of a signal recording area on the magnetic disc. The writing of servo signals to the magnetic disc is done by a servo signal writing apparatus including an optical head disposed movably in a position corresponding to the moving position of the scale to detect the position information recorded on the scale, and a main controller to move the magnetic head radially of the magnetic disc for writing the servo signal to the magnetic disc and to move the optical head correspondingly to a position where the servo signal is to be written. The position where the position information is to be detected is changed by moving the optical head correspondingly to the position where the servo signal is to be written, thereby recording a servo signal to each of all the areas on the magnetic disc. Thus, the disc recording and/or reproducing apparatus and servo signal writing apparatus can implement a high accuracy, high resolution and a low cost in recording servo signals to a disc provided in the disc recording and/or reproducing apparatus.

Disc recording/reproducing apparatus and servo signal writing apparatus

A hard disc drive is comprised of a casing, a head arm located in the casing and movable in unison with a head, and a diffraction grating mounted on the head arm so as to diffract a light introduced into the casing from the outside of the casing, in which a light diffracted by the diffraction grating is introduced to the outside of the casing. Also, this hard disc drive further comprises an optical system provided outside the casing for receiving the diffracted light, the optical system detecting the arm position, a controller for controlling the arm position, and a servo signal writer for writing a servo signal on the disc on the basis of a detected signal.

Growing community of inventors

Kanagawa, Japan

Kayoko Taniguchi