Fanuc Corporation

Olympus Optical Company, Ltd.

Seikosha Co., Ltd.

Kabushiki Kaisha Seikosha

Ryudensha Co., Ltd.

Yoshiaki Ikeda

Toyoaki Takeuchi

Mitsuru Kuwasawa

Ken Ohshima

Hideyuki Kenjyo

Masaharu Sakamoto

Hiroo Okada

Shinichi Isobe

Yoshio Tamura

Mitsuo Kurakake

Nobuyuki Kiya

Shoichi Otsuka

Masahiko Nanri

Kenichi Ito

Ken Ohsima

Makie Morota

Hiroshi Noritake

Yasuki Onizuka

A numerical control apparatus allows a portion of a prototype or the like to be easily machined without an operator being concerned with a coordinate system, origins, and other data. A guidance function executing unit displays guidance information on a display unit. According to the displayed guidance information, the operator enters machining commands using a keyboard, etc. A pulse distributing unit sends present positions from present position registers to the guidance function executing unit. The guidance function executing unit calculates a movement command from command values commanded by the operator and the present positions, and sends the calculated movement command to the pulse distributing unit, which outputs distributed pulses to drive the machine tool.

Numerical control apparatus and method for controlling a machine

Workpiece exchanging system

Cooperative operation system for numberical control apparatus

Programmable controller with modifiable ladder program

Numerical control device for transfer machines

Reference point return system

Machine position detecting apparatus

System for processing MST function command

NC unit processing method

Axis feedrate output system

A focused light beam is projected upon an optical recording medium through an optical system in an optical pickup, and a light reflected from the recording medium is received to detect a focus error signal and a tracking error signal. Further, the focus control and the tracking control are both achieved through a servo feedback loop in response to the detected focus and tracking error signals. In this optical information recording and reproducing system, track formats are provided from which lights of different intensities are reflected, the track formats are discriminated by a projection position detecting circuit, and the focusing and tracking operations are controlled by selectively adjusting the gain of the servo feedback system according to the detected track format, so that the control operation is stable in recording or reproducing information data to or from a recording medium of a high density type, in particular.

Optical information recording/reproducing system with variable gain

An optical pickup is provided below an optical disk. A laser beam is emitted from a semiconductor laser onto a track, through an objective lens. The objective lens is capable of shifting, and is shifted in the direction of the track width by a magnetic force from a tracking actuator, thereby performing lens tracking. The optical pickup is mounted on a carriage. The carriage is shifted along the radial direction of the optical disk by a voice coil motor. This shifts the laser beam along the radial direction of the optical disk, thereby performing track access. Upon reception of an access command, a velocity control mode commences, and the shift velocity of the carriage is controlled in accordance with a velocity control signal corresponding to the distance between a target track and a current track. When the pickup arrives near the target track, the generation of velocity control signal ceases and the location control mode commences. When the carriage is deviated from the target track, its servo is adjusted in accordance with its deviation, by a location control signal. During velocity control of the carriage, a lens damping signal corresponding to the velocity control signal is supplied to the objective lens. After location control of the carriage commences, the lens damping signal corresponding to a location cotnrol signal is supplied to the objective lens until the velocity of the carriage falls below a predetermined value.

Optical recording/reproducing device

There is disclosed a color filter for wind-up system color changer which comprises two sheets of laminated transparent films in continuous length, having a plural number of units each comprising a sheet of a transparent film folded in two provided in series sealed between the films in continuous length with its line of flection being disposed along the longer direction of the films in continuous length, and the edges of the units on the opposite side to the line of flection being under the state opened.

Color filter for wind-up system color changer

An optical recording/reproducing apparatus includes a pickup with a laser light source, an objective lens and lens drive coil for moving the optical axis of the laser beam transmitted through objective lens, a carriage drive voice-coil motor for moving a carriage with the pickup mounted thereon to move the laser beam transmitted through the objective lens, and tracking apparatus for operating both the lens drive coil and the carriage drive voice-coil motor. The tracking apparatus includes a lens servo stable detecting device for detecting that the laser beam from the objective lens has reached a desired track, apparatus for turning on a servo control loop with the lens drive coil in response to a tracking instruction, and apparatus for turning on a servo control loop with the carriage drive voice-coil motor in response to a detection output from the lens servo stable detecting device.

Optical memory accessing and tracking apparatus with pickup and lens

An optical pickup is arranged under an optical disk. Tracks of the disk are irradiated with a laser beam from the pickup. A beam reflected by a given track becomes incident on the pickup. A tracking error signal from the pickup is supplied to a lens moving actuator through a gain phase compensating circuit and a lens driving circuit, and an objective lens in the pickup is radially moved along disk. The tracking error signal is supplied to a voice coil motor through the phase compensating circuit. A carriage carrying the pickup thereon can be radially moved along the disk. When a tracking instruction is generated, the lens driving circuit drives the objective lens to start tracking. Meanwhile, the low-frequency components of the tracking error signal which are lower than the resonance frequency of the lens tracking circuit are amplified by the gain phase compensating circuit. When the tracking error signal is converged within a predetermined threshold range, the amplification of the low-frequency components of the tracking error signal is stopped. At the same time, the operation of the voice coil motor is started. Tracking is performed by both the objective lens and the carriage to achieve two-step servo tracking.

Tracking control apparatus

Growing community of inventors

Tokyo, Japan

Yoshiaki Ikeda