Abstract: A reflex-type screen for reflecting obliquely projected light from a projector to a front of the screen. The screen includes a light absorbing base material and a plurality of inclined planes disposed on the base material. The planes are arranged such that projected light do not enter non-projector side inclined planes, and the projector side and non-projector side planes alternate to form a saw-tooth shaped arrangement. A light reflecting white resin layer is disposed on the projector side planes to reflect light from the projector to the front of the screen. A transparent light diffusing layer including binding agent and diffusing agent is formed to cover the white resin layer and the base material, including all inclined planes. The non-projector side inclined planes absorbs incident light and the diffusing layer diffuses light reflected by the white resin layer.

Abstract: A reflex-type screen 2 for reflecting a light projected obliquely from a projector to a front of the reflex-type screen 2, including a base material 5 made of material which absorbs light, a white resin layer 6 which is formed on a projector side inclined plane 3 on the base material 5 and reflects light and a transparent diffusing layer 8 which includes transparent binder resin and diffusing agent, and is formed to cover the white resin layer 6, and the base material 5 includes the projector side inclined plane 3 that is provided at an angle so that light from the projection enters the projector side inclined plane 3 and a non-projector side inclined plane 4 that is provided at an angle so that the light from the projection does not enter the non-projector side inclined plane 4, and the projector side inclined plane 3 and the non-projector side inclined plane 4 are located alternatively, so that the base material 5 is formed to be saw-toothed shape.

Abstract: A reflex-type screen includes a base which has saw-tooth appearance, and an optical absorption layer on one edge of each saw-tooth of the base. The base consists of white resin and includes a plurality of projector side inclined planes and non-projector side inclined planes, which are alternately provided to form the saw-tooth appearance. The projector side inclined planes are oriented so that the image light from the projector may be incident on them, while the non-projector side inclined planes are oriented so that the image light from the projector may not be incident on them. The optical absorption layer is formed on each of the non-projector side inclined planes of the base to absorb the light. The projector side inclined plane reflects the image light just in front of the observer of the reflex-type screen from the projector.

Abstract: A first amplifier which amplifiers a faint read signal read by a head is connected to a second amplifier which further amplifiers the read signal amplified by the first amplifier, via a signal line. The signal line is used to transmit the read signal from the first amplifier to the second amplifier, and also to transmit a control signal from the second amplifier to the first amplifier. On the basis of, for example, a point in time at which a servo mark is detected from servo data, a control unit sets a period of time in which the transmission of the control signal from the second amplifier to the first amplifier is permitted, so that it does not overlap a period of time in which the servo data is read.

Abstract: A detector detects, in read data, a servo address mark of a type indicated by a register. Every time a SAM is detected during a self servo process, a CPU carries out tracking control in accordance with corresponding servo data. The CPU causes a head to write a corresponding type of additional servo data item in a disk at a position offset from the position of servo data containing the detected SAM, by a predetermined distance in a circumferential direction of the disk. Every time sets of servo data, each consisting of various types of data items, are written in the disk, the head is moved by a predetermined pitch in a radial direction of the disk.

Abstract: A servo mark detector detects a servo mark from each servo information item detected by the servo detector. A counter measures a time period each time a servo mark is detected, thereby measuring a servo interval. A correction circuit corrects a time period T2 on the basis of the measured servo interval and an ideal servo interval. A determination circuit determines which one of the time period T2 and a time period T2? obtained by correcting the time period T2 should be used. A servo-sector-pulse-generating unit generates a servo sector pulse a time period T1 after the detection of each servo mark, and generates a pseudo servo sector pulse when the time period determined by the determination circuit has elapsed after the detection of each servo mark, if the next servo mark is not detected during the determined time period.

Abstract: A detector detects, in read data, a servo address mark of a type indicated by a register. Every time a SAM is detected during a self servo process, a CPU carries out tracking control in accordance with corresponding servo data. The CPU causes a head to write a corresponding type of additional servo data item in a disk at a position offset from the position of servo data containing the detected SAM, by a predetermined distance in a circumferential direction of the disk. Every time sets of servo data, each consisting of various types of data items, are written in the disk, the head is moved by a predetermined pitch in a radial direction of the disk.

Abstract: A first amplifier which amplifiers a faint read signal read by a head is connected to a second amplifier which further amplifiers the read signal amplified by the first amplifier, via a signal line. The signal line is used to transmit the read signal from the first amplifier to the second amplifier, and also to transmit a control signal from the second amplifier to the first amplifier. On the basis of, for example, a point in time at which a servo mark is detected from servo data, a control unit sets a period of time in which the transmission of the control signal from the second amplifier to the first amplifier is permitted, so that it does not overlap a period of time in which the servo data is read.

Abstract: A servo mark detector detects a servo mark from each servo information item detected by the servo detector. A counter measures a time period each time a servo mark is detected, thereby measuring a servo interval. A correction circuit corrects a time period T2 on the basis of the measured servo interval and an ideal servo interval. A determination circuit determines which one of the time period T2 and a time period T2′ obtained by correcting the time period T2 should be used. A servo-sector-pulse-generating unit generates a servo sector pulse a time period T1 after the detection of each servo mark, and generates a pseudo servo sector pulse when the time period determined by the determination circuit has elapsed after the detection of each servo mark, if the next servo mark is not detected during the determined time period.

Abstract: In a sector servo type hard-disk apparatus, in the case where a recording medium is not manufacture-formatted, gain control data is written/read in/from a CSS zone of the recording medium after power is turned on and before the first seek is executed. The write/read of the gain control data in/from the CSS zone is also executed in accordance with a peak level of an output signal from an AGC amplifier.

Abstract: When a brushless DC (direct current) motor is started to rotate a rotor, a normal current value is set and then a motor drive current corresponding to the set normal current value is supplied to the brushless DC motor. If the brushless DC motor is not started by this motor drive current, the current value to be set is increased at a desired rate, and a motor drive current corresponding to the increased current value is supplied to the brushless DC motor. That is, the motor drive current corresponding to the current value increased at a desired rate is sequentially supplied to the brushless DC motor until the brushless DC motor has started.

Abstract: Intake device for multiple cylinder I.C. engine, the intake opening of the carburetor for each cylinder being connected with a carburetor base connected to an air cleaner in chamber form. The chamber intake openings for each carburetor are separated by partition plates.