Abstract:
The circuit structured to drive a motor is provided. The circuit includes: a division signal generator that generates a division signal dividing each of a high level period and a low level period of a binary position signal representing a relative position of a magnetic coil to a permanent magnet into a preset number of multiple divisions; a pulse width setter that sets a pulse width for PWM control corresponding to each of the multiple divisions represented by the division signal; and a PWM signal generator that performs PWM control with the set pulse width, thereby generating a PWM signal as a driving signal for driving the motor.
Abstract:
A small, lightweight relative drive device is provided, which is capable of producing large torque. The relative drive device of a two-phase magnetic excitation type according to an aspect of the invention comprises first and second coil groups and a magnet group. The magnet group includes magnets disposed with alternating north and south poles facing the first and second coil groups. The first and second coil groups are disposed at positions that are out of phase with each other by an odd multiple of π/2 in electrical angles. The coils in the first and second coil groups have substantially no magnetic material cores, and the relative drive device has substantially no magnetic material yoke for forming a magnetic circuit.
Abstract:
A projector with a light source device; an optical modulator for modulating a light beam irradiated by the light source device; a projection optical device for projecting the light beam modulated by the optical modulator in an enlarged manner; and an exterior casing for housing the light source device, the optical modulator, and the projection optical device, includes: an optical diaphragm disposed on an optical path between the light source device and the optical modulator, the optical diaphragm having a light shield for shielding at least a part of an incident light beam, the optical diaphragm adjusting light quantity of a light beam irradiated by the light source device by moving the light shield into and out of the optical path; a nonvisible light eliminator disposed on the downstream of the optical diaphragm on the optical path, the nonvisible light eliminator reflecting or transmitting a light beam in the nonvisible light region of the light beam irradiated by the light source device to guide the light beam in the nonvisible region out of the optical path; and a nonvisible light detector for receiving the light beam in the nonvisible light region which is guided to be out of the optical path by the nonvisible light eliminator, the nonvisible light detector outputting a light-receiving signal.
Abstract:
The drive control circuit (200) includes a driver circuit (250) for intermittently supplying the magnetic coils with a supply voltage VSUP; a switching signal generating circuit (240) that generates a switching signal supplied to the driver circuit (250); and a voltage setter (270) that supplies a supply voltage control value Ya to the switching signal generating circuit (240). By adjusting pulse width of the switching signals DRVA1, DRVA2 with reference to the supply voltage control value Ya, the switching signal generating circuit (240) adjusts the effective voltage which is applied to the magnetic coils.
Abstract:
Provided is a small motor superior in weight/torque balance. A phase stator 10 and B phase stator 12 are disposed to face each other. A rotor is interpositioned between these stators. Electromagnetic coils @ are provided to the stators evenly in the circumferential direction. A permanent magnet is provided to the rotor evenly in the circumferential direction. The exciting polarity of the electromagnetic coil is alternately opposite, and this is the same for the permanent magnet. A signal having a prescribed frequency is input to the A phase electromagnetic coil and B phase electromagnetic coil. The rotor rotates between the stators as a result thereof.
Abstract:
A multilevel input interface device connected to a signal bus including one or more data lines that transmit an M-level signal and a clock line that transmits a transmission clock signal indicating the timings of reading level information for the M-level signal, includes: a threshold value generation unit that produces a plurality of voltage outputs as a plurality of variable comparison reference signals according to the level-varying supply voltage; a level detection unit that compares, in synchronization with the transmission clock signal, the M-value level signal with the variable comparison reference signals and generates a logic output corresponding to an instantaneous value of the M-level signal; and a logic circuit unit that converts the logic output to a data signal.
Abstract:
A variable power supply voltage generator generates a variable power supply voltage Vvar and supplies it to other circuits. A transmitting circuit 130 (or 140), operative at the variable power supply voltage Vvar, generates multi-value analog signals Smulti and transmits them to other circuits. A receiving circuit 140 (or 130), operative at the variable power supply voltage Vvar, receives the multi-value analog signals Smulti and subjects them to A/D conversion to generate multi-value digital signals. The threshold voltage generator generates threshold voltages used for A/D conversion from the variable power supply voltage Vvar or from a signal having a voltage value proportional to that of the variable power supply voltage Vvar and supplies them to the receiving circuit. An analog clock generator 120 generates an analog clock signal having a cyclical analog waveform. In response to the analog clock signal, a clock pulse generator 150 generates a clock pulse signal having a cycle period of 1/N of the cycle period of the analog clock signal. The clock-synchronous circuits 130, 140 operate synchronously with the clock pulse signals generated by the clock pulse generator 150.
Abstract:
A resonance control apparatus 100 includes a VCO 10 which generates a reference signal having a predetermined frequency, a divider 20 which divides the predetermined frequency of the reference signal, a phase reference forming section 50 which delays a phase of the divided signal for a predetermined interval, a voltage comparator 40 which compares a voltage of the output signal from a piezoelectric sensor 2 for detecting the driving state of a piezoelectric load 3 in synchronization with the driving of the piezoelectric load 3 with a predetermined voltage, a phase comparator 60 which compares the phase of the output signal from the voltage comparator 40 with the phase of the output signal from the phase reference forming section 50, and a duty control section 30 for controlling a duty ratio of the drive signal supplied to the piezoelectric load 3 based on the reference signal.
Abstract:
The brushless motor includes a first permanent magnet magnetized in a direction perpendicular to the drive direction, and a electromagnetic coil wound around an axis parallel to the drive direction. The drive control circuit supplies a drive current in a given first electric current direction to the electromagnetic coil without changing the electric current direction to operate the brushless motor in the drive direction.
Abstract:
A moving image display device for displaying a moving image based on moving image data includes a plurality of display elements arranged in a matrix configuration and a driver configured to drive the plurality of display elements. The plurality of display elements are divided into i (where i is an integer not lower than 2) groups respectively containing a predetermined number of rows of the display elements. The driver sequentially selects the display elements row by row in parallel for the respective i display element groups and provides the selected display elements with a drive signal in accordance with the moving image data.