摘要:
CD-ROMS of more or less poor quality, such as those having eccentric center holes or uneven weight distributions circumferentially, tend to overload tracking and focusing servos and hence to invite read errors and retries. Each CD-ROM on being loaded into a CD-ROM drive is therefore checked as to its quality preparatory to reading. Either or both of the servos may fail to keep the read beam under control if the disk is not of good quality. Such unlocking of either or both servos is detected in terms of the number of transducer output pulses, the magnitude of transducer output voltage, or the number of read errors, during a complete disk revolution. Disk quality is first checked at four times the standard audio CD speed, then at eight times that speed, and finally at twelve times that speed. Disks of poor quality are read at two times the standard audio CD speed, those of below-average quality at four times that speed, those of above-average quality at eight times that speed, and those of good quality at twelve times that speed.
摘要:
CD-ROMS of poor quality, such as those having eccentric center holes or uneven weight distributions circumferentially, tend to overload b tracking and focusing servos and to invite read errors and retries. Each CD-ROM on being loaded into a CD-ROM drive is therefore checked as to its quality preparatory to reading. The disk is first rotated at eight times the standard audio CD speed, with both tracking and focusing servo gains set at matching values. If then at least either servo malfunctions, the disk is of poor quality, fit for reading at four or two times the standard audio CD speed. If both servos function normally, on the other hand, then the disk quality is rechecked at the same speed as before but with the servo gains lowered six decibels. A malfunctioning of at least either servo at this time indicates that the disk is of intermediate quality, to be read at eight times the standard audio CD speed. On the other hand, if both servos still function normally, the disk Is of good quality, suitable for reading at 12 times the standard audio CD speed.
摘要:
CD-ROMS of more or less poor quality, such as those having eccentric center holes or uneven weight distributions circumferentially, tend to overload tracking and focusing servos and hence to invite read errors and retries. Each CD-ROM on being loaded into a CD-ROM drive is therefore checked as to its quality preparatory to reading. Either or both of the servos may fail to keep the read beam under control if the disk is not of good quality. Such unlocking of either or both servos is detected in terms of the number of transducer output pulses, the magnitude of transducer output voltage, or the number of read errors, during a complete disk revolution. Disk quality is first checked at four times the standard audio CD speed, then at eight times that speed, and finally at twelve times that speed. Disks of poor quality are read at two times the standard audio CD speed, those of below-average quality at four times that speed, those of above-average quality at eight times that speed, and those of good quality at twelve times that speed.
摘要:
A three-phase motor having three Hall-effect devices for production of as many rotor position signals for use in excitation control of its windings, the signals being indicative of the angular position of the motor rotor with respect to the stator and having phase differences of 120 degrees. A motor speed control system is disclosed which utilizes the rotor position signals for detection of the actual running speed of the motor. Included are differentiating circuits connected one to each Hall-effect device for producing outputs in prescribed phase relationship with the rotor position signals. Connected to the differentiating circuits, switching transistors are controlled by binary switch control signals derived from the rotor position signals, passing the positive half-waves, or approximately positive half-waves, of the differentiating circuit outputs. The thus-obtained half-waves are then added together into a motor speed signal representative of the actual running speed of the motor. This signal is subsequently compared with a target speed signal indicative of a desired running speed of the motor, and the difference, if any, therebetween is fed as a speed control signal into a motor excitation circuit, which responds to both the rotor position signals and the speed control signal for exciting the motor windings for rotation at the desired speed.
摘要:
A mobile type service provider terminal registers a service providing area to a presence management server before a service starts. The presence management server creates a status management table of the mobile type service provider terminal. When the presence of the mobile type service provider terminal is detected in an area, the terminal registers information contents, which are delivered to subscribers, to an information delivery server. When the information delivery server stores the registered information contents to an information contents database and completes the creation of an information providing table, it notifies a service control server of the information. The service control server creates a message with reference to the information notified from the information delivery server and delivers it to the subscribers.
摘要:
Provided is a lighting device having high luminance in-plane uniformity without a dark part occurring at a connecting part between surface light source panels.The lighting device (1) is provided with a plurality of surface light source panel (2), and a plurality of light diffusion passive reflectors (3) disposed at the light-emitting side of the surface light source panel (2). In the light diffusion passive reflector (3), a rectangular-shaped bottom surface is disposed on a light emitting region of the surface light source panel (2), and a light-emitting surface (3a) has substantially the same size as a planar outline of the surface light source panel (2), and a side surface (3c) is formed to incline diagonally outward towards the light-emitting surface (3a) from the bottom surface. The light diffusion passive reflectors (3) which are mutually adjoining are disposed to contact with each other without a gap in between, and are disposed so that the light-emitting surface (3a) is continuously arranged.
摘要:
The current invention is to provide an oxygen gas diffusion cathode for brine electrolysis which reduces an initial electrolysis voltage and is excellent in the durability against short-circuit, and an electrolytic cell and an electrolytic method using the same. The oxygen gas diffusion cathode for brine electrolysis includes a gas diffusion layer 13 and a reaction layer 14 on one surface of an electro-conductive substrate 12, and an electro-conductive layer 15 on the opposite surface thereof. The present oxygen gas diffusion cathode reduces the resistance of the electro-conductive substrate 12 and supplies uniform current by mounting the electro-conductive layer 15.
摘要:
Image fixing apparatus for fixing a toner image through a nip, the apparatus including a cylindrical film; a nip forming member contacting an inner surface of the film; a pressing rotatable member forming the nip in cooperation with the nip forming member with the film interposed therebetween; and a regulating member for regulating movement of the film in a direction of a generatrix of the film, wherein the regulating member has an opposing surface opposing an edge of an end portion of the film with respect to the direction of the generatrix, and the opposing surface has a regulation region for regulating the edge of the film when the film is driven and moves in the generatrix direction, wherein the regulation region is narrower in a downstream side of a center portion of the nip than in an upstream side thereof with respect to a sheet feeding direction.
摘要:
A substitution call control system includes an ATM (Asynchronous Transfer Mode) subscriber network of an ATM communication network. The ATM subscriber network includes a plurality of network terminators respectively connected with a plurality of subscriber terminals, and an ATM subscriber line concentrator, which accommodates VCs (Virtual Connection) to the plurality of network terminators, and is connected with a ATM switching apparatus of the ATM network through a UNI (User-Network Interface). The ATM subscriber line concentrator includes a substitution call control function to substitute for the plurality of network terminators and the subscriber terminals for a call control.
摘要:
The present invention provides a cathode for hydrogen generation comprising a cathode substrate having provided thereon a catalytic layer, wherein the catalytic layer contains at least three components of platinum, cerium and lanthanum in amounts of 50 to 98 mol %, 1 to 49 mol % and 1 to 49 mol %, respectively, in the form of metal, metal oxide or metal hydroxide.