摘要:
A dielectric-barrier discharge lamp light source with a dielectric-barrier discharge lamp, the light source including a discharge plasma space filled with a discharge gas in which excimer molecules are formed by dielectric-barrier discharge, two electrodes adapted to induce a discharge phenomenon in the discharge gas, at least one of the two electrodes being separated from the discharge gas by a dielectric, and a power supply for impressing a substantially cyclical, high-voltage alternating current on the two electrodes of the dielectric-barrier discharge lamp in a manner that when the power supply completes a discharge in the dielectric-barrier discharge lamp and the voltage impressed on the dielectric-barrier discharge lamp changes for a subsequent discharge, there is a period of gradual change in a lamp voltage waveform (Vs(t)) before reaching a voltage required for beginning of the subsequent discharge, wherein subsequent to the period of gradual change, the voltage impressed on the dielectric-barrier discharge lamp by the power supply changes sharply.
摘要:
A device for operation of a discharge lamp in which a dielectric barrier discharge lamp can discharge with high efficiency. A discharge lamp of the outside electrode type, a dielectric barrier discharge excimer lamp type, or the like, is operated by applying a lamp voltage of 1 kV to 10 kV with a periodic waveform by an operation circuit. In this lamp, within bulb including a dielectric, at least one type of rare gas is hermetically enclosed in a given amount. A dielectric barrier is located between at least one electrode and the gas, and a discharge is produced in the bulb via this dielectric barrier. The rise time or fall time of a waveform which represents a main energy supply time in the periodic waveform, is fixed at greater than or equal to 0.03 .mu.s and less than or equal to 9 .mu.s. Furthermore, the distance between the waveform which represents the main energy supply and a adjacent waveform which represents an adjacent main energy supply is greater than or equal to 3.4 .mu.s.
摘要:
When a head passes over a track with a projected item in a seek operation, the CPU delays a seek start time to conduct the seek by changing a period of time from a seek start position to a position of the track with a projected item. Or, the CPU conducts seek control by changing a speed table. Or, the CPU changes a sequence of items of a tag queue to obtain a seek locus not passing the projected item. By the control operation, a seek error due to thermal asperity is prevented and the head is not damaged. This also prevents appearance of a new projected item produced by contact between the magneto-resistive head and the projected item on the recording medium.
摘要:
The invention relates to a device for operating a fluorescent discharge lamp of the outer electrode type. As claimed in the invention a switching device is turned on and off by driver signals with a stipulated frequency, by which on the secondary side of a transformer the periodic voltage waveform shown at A in FIG. 1 is produced. This voltage waveform is applied to the fluorescent discharge lamp of the outer electrode type, and thus operation is effected. For the above described periodic voltage waveform, with respect to repetition period t 2 Wo
摘要:
A method for writing servo patterns onto a disk of a disk drive. The method includes providing a plurality of different drive currents for an actuator while pushing the actuator into a crash stop defining a swing range of the actuator. The method also includes performing a write operation for at least one of the plurality of different drive currents to write a plurality of servo pattern tracks including a plurality of separate servo pattern sectors. Furthermore, the method includes gradually changing a drive current of the plurality of different drive currents while pushing the actuator into the crash stop so as to gradually move a read element in searching for a servo pattern track to a radial position different from a radial position of the write element. Moreover, the method includes positioning the read element at one of the plurality of servo pattern tracks.
摘要:
A method for writing servo sector sets that include a plurality of separate servo sectors on a disk so that servo sectors are present at same circumferential positions but different radial positions. The method includes reading a first servo sector set in a track with a read element such that the track includes first, second and third servo sector sets. The method also includes writing the third servo sector set with a write element at a different radial position from the read element with positional control and timing control using the first servo sector set while skipping the second servo sector set if all servo sectors of the first servo sector set are non-defective. Moreover, the method includes using positional control and timing control using the second servo sector set in the writing of the third servo sector set if the first servo sector set includes a defective servo sector.
摘要:
A method for writing servo sector sets that include a plurality of separate servo sectors on a disk so that servo sectors are present at same circumferential positions but different radial positions. The method includes reading a first servo sector set in a track with a read element such that the track includes first, second and third servo sector sets. The method also includes writing the third servo sector set with a write element at a different radial position from the read element with positional control and timing control using the first servo sector set while skipping the second servo sector set if all servo sectors of the first servo sector set are non-defective. Moreover, the method includes using positional control and timing control using the second servo sector set in the writing of the third servo sector set if the first servo sector set includes a defective servo sector.
摘要:
Embodiments of the invention prevent a magnetic head from coming into contact with a protrusion on a magnetic disk. In one embodiment, a head gimbal assembly includes a piezoelectric actuator for changing the flying height of a head/slider assembly. The address of a protrusion on a magnetic disk is preregistered in a nonvolatile memory. When a seek operation or following operation is to be performed, the head/slider assembly flies at a reference flying height. Before the protrusion passes below the head/slider assembly, an operating voltage is applied to the piezoelectric actuator to increase the flying height. After the protrusion passes below the head/slider assembly, the head/slider assembly flies at the reference flying height with operating voltage application stopped.
摘要:
A machine tool comprising a table on which a spindle holding the workpiece moves in horizontal direction along the workpiece. A tool post is sidewardly movable toward the table. An arbor head is connected to the end of the post and is both axially and circumferentially movable. The arbor head includes a powered arbor for holding and possibly rotating a tool. The result is that the workpiece is movable in one direction and the arbor support is movable in two other orthogonal directions as well as being rotatable. Thereby, a variety of complex machining operations may be performed. A tool magazine and an automatic tool changer are provided.
摘要:
A heating device in which uniform heating of an article to be processed is possible even in the case a temperature change which leads to a loss of the uniformity of the temperature distribution in a narrowly delineated area, and in which a reduction in the size of the device is possible. The heating device has a plurality of heaters, each heater having a single bulb of transparent material in which there is a filament that is divided in the axial direction into several filament parts and the respective filament parts are supplied with power independently of each other.