Abstract: Described are microparticle fractionating apparatus and methods of fractionating microparticles. Multiple electrodes may be used to charge droplets when separating and collecting microparticles based on a result analyzed by an optical methodologies. A first electrode may be used to charge a sample fluid, and a second electrode used to apply additional charge near a droplet break-off point.

Abstract: Described are microparticle fractionating apparatus and methods of fractionating microparticles. Multiple electrodes may be used to charge droplets when separating and collecting microparticles based on a result analyzed by an optical methodologies. A first electrode may be used to charge a sample fluid, and a second electrode used to apply additional charge near a droplet break-off point.

Abstract: A fine particle analyzing apparatus includes a light irradiation unit configured to irradiate a fine particle that flows in a flow path with a laser beam, and a detection unit configured to detect light emitted from the fine particle that is irradiated with the laser beam. In the fine particle analyzing apparatus, the light irradiation unit includes at least a light source that is composed of a semiconductor laser, an optical fiber that converts a beam pattern of the laser beam generated from the light source into a top-hat type beam pattern, and a light source driving control unit configured to supply driving current, which is obtained by superimposing high-frequency current on direct current, to the light source.

Abstract: There is provided a microparticle analysis apparatus including a light irradiation unit, which includes a plurality of light sources that emit laser light beams having different wavelengths, and which is configured to irradiate, with the laser light, microparticles flowing through a channel, and a light source drive control unit configured to control light emission by each light source in the light irradiation unit. The light source drive control unit is configured to supply a first current to each light source, and to supply in a time-division manner a second current to each light source while the first current is being supplied.

Abstract: A fine particle analyzing apparatus includes a light irradiation unit configured to irradiate a fine particle that flows in a flow path with a laser beam, and a detection unit configured to detect light emitted from the fine particle that is irradiated with the laser beam. In the fine particle analyzing apparatus, the light irradiation unit includes at least a light source that is composed of a semiconductor laser, an optical fiber that converts a beam pattern of the laser beam generated from the light source into a top-hat type beam pattern, and a light source driving control unit configured to supply driving current, which is obtained by superimposing high-frequency current on direct current, to the light source.

Abstract: A semiconductor laser drive circuit of the present invention reduces the number of wires, solves the out-of-timing problem of pulses due to differences in wire length, and emit short light pulses at a high transfer rate. A common emitter circuit (18) converts a voltage signal (J1) input at an input port (18a) into a current signal and, when reading information, adds the current signal to a signal output from a high-frequency oscillator circuit (20). High frequency components of the current signal converted from the voltage signal (J1) within a bandwidth of a transistor (Q6) are boosted. Degradation of the output signal of the high-frequency oscillator circuit (20) is kept at a minimum by a common base circuit including the transistor (Q6). A current switch circuit (16) cuts off or lets through the output current of a current mirror circuit (12).

Abstract: An optical head enabling a size reduction so that the optical head can be stored in an opening of a cartridge for a disk and enabling an improvement in the dynamic performance as the density and transfer rate are increased is provided. In a two-axis actuator optical head capable of driving an objective lens (102) along the Z axis in the focus direction, that is, vertical to the surface of the optical disk and along the X axis in the tracking direction, that is, the radial direction of the optical disk. The objective lens (102) is disposed in the center of the coil bobbin (101), a focusing coil (103) is disposed around the coil bobbin (101) and is wound around the X axis, and tracking coils (104a and 104b) are disposed on both ends of the coil bobbin (101) in the X axis direction and are wound around the X axis.

Abstract: A semiconductor laser drive circuit of the present invention reduces the number of wires, solves the out-of-timing problem of pulses due to differences in wire length, and emit short light pulses at a high transfer rate. A common emitter circuit (18) converts a voltage signal (J1) input at an input port (18a) into a current signal and, when reading information, adds the current signal to a signal output from a high-frequency oscillator circuit (20). High frequency components of the current signal converted from the voltage signal (J1) within a bandwidth of a transistor (Q6) are boosted. Degradation of the output signal of the high-frequency oscillator circuit (20) is kept at a minimum by a common base circuit including the transistor (Q6). A current switch circuit (16) cuts off or lets through the output current of a current mirror circuit (12).

Abstract: A semiconductor laser drive circuit of the present invention reduces the number of wires, solves the out-of-timing problem of pulses due to differences in wire length, and emit short light pulses at a high transfer rate. A common emitter circuit (18) converts a voltage signal (J1) input at an input port (18a) into a current signal and, when reading information, adds the current signal to a signal output from a high-frequency oscillator circuit (20). High frequency components of the current signal converted from the voltage signal (J1) within a bandwidth of a transistor (Q6) are boosted. Degradation of the output signal of the high-frequency oscillator circuit (20) is kept at a minimum by a common base circuit including the transistor (Q6). A current switch circuit (16) cuts off or lets through the output current of a current mirror circuit (12).

Abstract: In an optical pickup, an objective lens and an aberration correcting mechanism are held so that they can be moved together.

Abstract: The present invention can simplify and miniaturize an optical pickup and further can prevent the deterioration of various characteristics even if an aberration correction mechanism is composed of a liquid crystal and the like by transmitting a drive signal of an actuator and a drive signal of an aberration correction mechanism by multiplexing them.

Abstract: An optical head enabling a size reduction so that the optical head can be stored in an opening of a cartridge for a disk and enabling an improvement in the dynamic performance as the density and transfer rate are increased is provided. In a two-axis actuator optical head capable of driving an objective lens (102) along the Z axis in the focus direction, that is, vertical to the surface of the optical disk and along the X axis in the tracking direction, that is, the radial direction of the optical disk. The objective lens (102) is disposed in the center of the coil bobbin (101), a focusing coil (103) is disposed around the coil bobbin (101) and is wound around the X axis, and tracking coils (104a and 104b) are disposed on both ends of the coil bobbin (101) in the X axis direction and are wound around the X axis.

Abstract: A device for driving a semiconductor laser in which, when a high frequency signal is superposed on a driving signal for the semiconductor laser for suppressing the scoop noise in the semiconductor laser, the amplitude of the high frequency signal can be controlled reliably and satisfactorily without dependency on temperature characteristics or chronological changes in the semiconductor laser.

Abstract: A semiconductor laser drive circuit of the present invention reduces the number of wires, solves the out-of-timing problem of pulses due to differences in wire length, and emit short light pulses at a high transfer rate. A common emitter circuit (18) converts a voltage signal (J1) input at an input port (18a) into a current signal and, when reading information, adds the current signal to a signal output from a high-frequency oscillator circuit (20). High frequency components of the current signal converted from the voltage signal (J1) within a bandwidth of a transistor (Q6) are boosted. Degradation of the output signal of the high-frequency oscillator circuit (20) is kept at a minimum by a common base circuit including the transistor (Q6). A current switch circuit (16) cuts off or lets through the output current of a current mirror circuit (12).

Abstract: The present invention can simplify and miniaturize an optical pickup and further can prevent the deterioration of various characteristics even if an aberration correction mechanism is composed of a liquid crystal and the like by transmitting a drive signal of an actuator and a drive signal of an aberration correction mechanism by multiplexing them.

Abstract: A semiconductor laser drive circuit capable of improving a driving speed of a high resistance semiconductor laser such as a GaN-based semiconductor laser, comprising a buffer circuit for shaping waveforms of input signals, a level-shift circuit for shifting the levels of output signals of the buffer circuit, a switch circuit for controlling and outputting signal levels of output signals of the level-shift circuit based on switch control signals, a combining circuit for combining output signals of the switch circuit, and a source follower for supplying power to a high resistance semiconductor laser based on an output signal of the combining circuit. The high resistance semiconductor laser is for example a GaN-based semiconductor laser for emitting blue-violet laser light.

Abstract: In an optical pickup, an objective lens and an aberration correcting mechanism are held so that they can be moved together.

Abstract: A device for driving a semiconductor laser in which, when a high frequency signal is superposed on a driving signal for the semiconductor laser for suppressing the scoop noise in the semiconductor laser, the amplitude of the high frequency signal can be controlled reliably and satisfactorily without dependency on temperature characteristics or chronological changes in the semiconductor laser.