摘要:
An optical pickup has an objective lens drive device which includes a fixed block fixed to a movement base, a movable block having an objective lens and a lens holder that holds the objective lens, a plurality of support springs that couples the fixed block with the movable block, and a focusing magnetic coil that operates the movable block in a focusing direction. A distance between the fixed block and a recording surface of a disk recording medium is larger than a distance between the movable block and the recording surface. The support springs are inclined with respect to the recording surface. The support springs have a longitudinal direction orthogonal to a direction of a thrust generated at the focusing magnetic circuit to the movable block during a focusing operation.
摘要:
A combined sensor and bearing assembly including a rolling bearing unit and a rotation sensor unit. The rolling bearing unit is made up of a rotatable raceway member, a stationary raceway member and at least one row of rolling elements. The rotation sensor unit includes a to-be-detected member having a magnet and fitted to one of the raceway members, and a magnetic detecting member fitted to the other raceway member at a location confronting the to-be-detected member. This combined sensor and bearing assembly is used at a location close to an electromagnetic coil emanating a leakage magnetic field, in a condition in which a direction of flow of an electric current through the electromagnetic coil is fixed in one direction so that a direction of a magnetic flux, with which the magnetic detecting member is switched off, may coincide with a direction of the leakage magnetic flux.
摘要:
In this invention, an objective lens driving device, an optical pickup, and an optical disk device are disclosed that have such feature that plural dynamic vibration absorbers provided at the retaining section, by which the elastic supporting members to support the movable section retaining the objective lens are connected to the movable section, can reduce resonance peak which may worsen the servo characteristic and suppress unwanted vibration effectively, since the character frequency of the dynamic vibration absorbers functions as a damper against the vibration of the movable section. This invention also discloses a method of suppressing vibration of the movable section.
摘要:
There is provided a car display device (100) mainly comprising a control unit (20), clips (30R, 30L), and a plug (40) for power source. An on-off signal which has a predetermined period to flash turn signal lamps (L.sub.L, L.sub.R) is input through either of the clips (30R, 30L) and its duration is begun to time. Then, a reference time for judgment is set to be longer than one period and shorter than two periods of the on-off signal. If the duration of the on-off signal is shorter than that of the reference times, the car display device 100 is actuated and the turn signal lamps (L.sub.L and L.sub.R) are being flashed for a predetermined time, simultaneously. Thus, the car display device (100) of the present invention has a simple construction and enables to send appreciation signals to a driver in a succeeding car with certainty.
摘要:
Three way valves forming a fuel cut-off valve are arranged across respective injection pipes connected to injection nozzles associated with preselected cylinders of the engine. In a first valve position, the three way valves connect the injection pump body or bodies of the fuel injection pump to the respective injection pipes, and in a second valve position, they connect the injection pump body or bodies to a lower pressure zone in the pump. Preferably, the fuel cut-off valve is pneumatically operated for high speed valve position changing action.
摘要:
A vibration absorber which comprises a damper provided between the flyweights and the shifter of a centrifugal governor for absorbing or lessening axial and/or radial vibrations produced in the flyweights. The absorber has a very simple construction, of which manufacture, mounting and maintenance can be carried out with facility. Also, it is free from resonance of the damper and its neighboring parts.
摘要:
A control device is provided which is operable to change the position of a distal end side link hub by driving each of arms, which are proximal end side links of a plurality of link mechanisms by means of an actuator. When in a series of operations, the position change of the distal end side link hub is mad by an angle greater than a predetermined angle, a relay position setting unit is provided for setting a relay point between a starting point and a terminating point of each of the arms so that the interference of the three axis arms may be relieved. A position change control unit performs a position control so as to pass simultaneously through the relay point so set.
摘要:
A distal end side link hub is connected to a proximal end side link hub via three or more link mechanisms such that alteration in posture of the distal end side link hub is allowed. Each of the link mechanisms includes a proximal side end link member, a distal side end link member, and an intermediate link member. A line member is disposed between the link hubs, two ends of the line member being held at line member holding points which are on link hub central axes, respectively. In a state where the link hubs are parallel to each other, when the distance from a midpoint to each spherical link center is defined as (D) and the distance from each spherical link center to its corresponding line member holding point is defined as (H), the relationship H=0.5×D is established.
摘要:
A link actuating device connects an output member to an input member through three or more link mechanisms for alteration in posture. Each of the link mechanisms includes end portion link members on input and output sides, and an intermediate link member. The link mechanisms are of such shapes that geometric models representing the link members by straight lines are such that input and output side portions are symmetrical to each other relative to an intermediate portion of each of the intermediate link members. Immobilizing mechanisms are provided in all of the link mechanisms to immobilize the output member in an arbitrary attitude relative to the input member. A structure body is provided to connect the input and output member to each other while being in contact with contacted portions formed in the input and output member.
摘要:
There is provided a display apparatus and an optical apparatus by which the generation of interfering pattern can be reduced while achieving miniaturization. The optical apparatus includes an optical device through which laser light passes; one or more holding members holding the optical device; and a driving section allowing the optical device to vibrate in a plane orthogonal to a light path of the laser light. Each of the holding members has an opening or a cutout through which the optical device passes at the time of vibration.