Abstract: A turbine rotor comprises first and second wheels each having turbine blades fixed to a peripheral portion thereof, and a spacer arranged so as to be sandwiched between the first and second wheels, and is characterized in that in a partitioning member is provided between the spacer and at least one of the first and second wheels, coolant paths in which coolant for cooling the turbine blades flows are provided inside the turbine blades, and a cavity formed by the partitioning member and the spacer is provided in a recovery course through which the coolant passed through the coolant paths is exhausted from the turbine blades. A gas turbine comprising the turbine rotor as mentioned above and a cooling method of the turbine rotor are disclosed.

Abstract: A heat shield pipe portion 12a formed in an air layer 21 to protect a bearing member metal 16 from the heat of a cooling medium 16 and a seal shaft portion 12c for forming a labyrinth seal 14 to prevent a leakage of the cooling medium are formed with one piece and they form a heat shield seal pipe 12. A component number for installing the components to a rear portion shaft 105 can be arranged as one and also a bolt connection portion can be deleted. Namely, the bearing member metal 16 can be constituted to protect the bearing member metal from the heat of the cooling medium and the construction of the gas turbine can be simple and the manufacture thereof performs easily and further during the operation time the generation of the vibrations according to the centering displacement can be reduced.

Abstract: A turbine rotor comprises first and second wheels each having turbine blades fixed to a peripheral portion thereof, and a spacer arranged so as to be sandwiched between the first and second wheels, and is characterized in that in a partitioning member is provided between the spacer and at least one of the first and second wheels, coolant paths in which coolant for cooling the turbine blades flows are provided inside the turbine blades, and a cavity formed by the partitioning member and the spacer is provided in a recovery course through which the coolant passed through the coolant paths is exhausted from the turbine blades. A gas turbine comprising the turbine rotor as mentioned above and a cooling method of the turbine rotor are disclosed.

Abstract: A turbine rotor for a gas turbine includes first and second wheels each having turbine blades fixed to a peripheral portion thereof, and a spacer arranged so as to be sandwiched between the first and second wheels. A partitioning member is provided between the spacer and at least one of the first and second wheels. Coolant paths in which coolant for cooling the turbine blades flows, are provided inside the turbine blades. A cavity formed by the partitioning member and the spacer is provided in a recovery course through which the coolant passed through the coolant paths is exhausted from the turbine blades.

Abstract: An optical-disk playback apparatus plays back an optical-disk on which control programs defining the operations of the optical-disk playback apparatus and other information are recorded. Such optical-disk playback apparatus is operable by a combination of an optical-disk, such as a laser disk or CD, and printed materials on which barcodes are printed. Predetermined programs are recorded defining the operation of the optical-disk playback apparatus corresponding to the barcodes. As a result, variable, complex and yet flexible optical-disk playback operations which are not fixed at the initial system designing stage can be accomplished by simply tracing the printed barcode. The operation of the optical-disk playback apparatus is controlled by the control programs recorded in the optical disk. Difficulties which might occur when an optical-disk and barcode of different systems are combined can be prevented since a one-to-one correspondence between the barcode and the optical disk code is established beforehand.

Abstract: An optical-disk playback apparatus is disclosed which plays back an optical-disk on which control programs defining the operations of the optical-disk playback apparatus and other information are recorded. Such optical-disk playback apparatus is operable by a combination of an optical-disk, such as a laser disk or CD, and printed materials on which barcodes are printed. Predetermined programs are recorded defining the operation of the optical-disk playback apparatus corresponding to the barcodes. As a result, variable, complex and yet flexible optical-disk playback operations which are not fixed at the initial system designing stage can be accomplished by simply tracing the printed barcode. The operation of the optical-disk playback apparatus is controlled by the control programs recorded in the optical disk.

Abstract: An optical disc apparatus comprising an optical servo loop and a velocity servo loop to control the velocity of a pickup to zero, wherein the two servo loops are selectively switched in accordance with the set mode of disc playing or the state of such playing. When a fast access is executed, the pickup is controlled by the velocity servo loop to avert undesired vibration in the travel of the pickup and also to protect the optical servo from any shock that may otherwise be caused by the travel and halt of the pickup. And in playing of any disc having a great amount of dropouts, the velocity servo loop is closed during the existence of such dropouts to keep the optical servo loop from the disturbance signal generated due to the dropout, thereby ensuring stable reproduction of signals from the disc.

Abstract: An optical disc apparatus comprising an optical servo loop and a velocity servo loop to control the velocity of a pickup to zero, wherein the two servo loops are selectively switched in accordance with the set mode of disc playing or the state of such playing. When a fast access is executed, the pickup is controlled by the velocity servo loop to avert undesired vibration in the travel of the pickup and also to protect the optical servo from any shock that may otherwise be caused by the travel and halt of the pickup. And in playing of any disc having a large number of dropouts, the velocity servo loop is closed during the existence of such dropouts to keep the optical servo loop from receiving a disturbance signal generated due to the dropout, thereby ensuring stable reproduction of signals from the disc.

Abstract: A rotation control apparatus for controlling a rotation of a recording medium in which a signal modulated in a run length limited code has been recorded in concentric or spiral information tracks at a constant linear velocity. An inversion time detecting circuit alternately detects a maximum or minimum transition interval of a reproduced digital signal from its rise transition to its fall transition, and a maximum or minimum transition interval of the reproduced digital signal from its fall transition to its rise transition, so as to thereby produce a transition interval signal corresponding to each of the detected maximum or minimum values. A motor drive circuit drives a motor in such a direction as to reduce a difference between the value of the transition interval signal and a predetermined value.

Abstract: Disclosed is a method of accessing data recorded in concentric circular or spiral tracks on a recording disc at high speed. A pickup at a position S on the disc is kicked to a position S' on a track on which an objective address data recorded position O exists. Thereafter, the disc is accelerated at a predetermined acceleration torque until the pickup reaches an intermediate position between the positions S' and O, which is determined by a rotational angle from the position S' to O. Then, the disc is decelerated at a predetermined deceleration torque so as to return a speed at which the pickup can read the recorded data before the pickup reaches the position O. With the acceleration and deceleration of the disc, the pickup can quickly become close to the position O and thus can access the data recorded at the position O within an extremely short time.

Abstract: A motor speed control apparatus includes a motor, a frequency generator for generating a detective frequency signal, the frequency of which is proportional to the motor speed, and a control signal generator. A rotational speed-error pulse train is produced by the control signal generator and is used for improving the load characteristics of the motor. The rotational speed of the motor is maintained constant at a predetermined speed, which is proportional to the reference frequency, for any load torque, the motor speed is not influenced by ambient temperature changes or long term characteristic variations of the electronic components utilized. Furthermore, the transient response of the motor is fast and the motor starts rotating smoothly and stably.

Abstract: A motor speed adjusting apparatus comprising a motor, a motor speed setting device such as an up-down counter, a programmable divider the divisor of which is programmed by the motor speed setting device, a reference signal generator, a phase comparator which generates a d.c. voltage corresponding to the phase difference between the reference frequency signal and the output signal of the programmable divider, and a voltage controlled oscillator which oscillates at a frequency corresponding to the output of the phase comparator. The motor speed is adjusted according to the output frequency of the oscillator by step deviation from the standard motor speed, and further that deviation is displayed by a display device controlled by the motor speed setting device.