Abstract: An abnormality of output laser light is detected for enhancement in safety. A light-source drive device includes a light-source control unit, a light-receiving unit, and an abnormality detection unit. The light-source control unit included in the light-source drive device controls light emission of a light source. The light-receiving unit included in the light-source drive device receives light from the light source through an output part allowing outward output of light of the light source. The abnormality detection unit included in the light-source drive device detects an abnormality of the light output from the output part, on the basis of the received light.

Abstract: A detection circuit (20) according to the present disclosure includes a multiple-input one-output operational amplifier (30). The operational amplifier (30) includes a first transistor group (31) and a second transistor (32). The first transistor group (31) includes plural transistors connected in parallel such that operating voltages for plural light emitting elements (5) are inputted individually to gates of the plural transistors, the gates being non-negated input terminals of the operational amplifier. The second transistor (32) cooperates with the first transistor group (31) to form a differential configuration and has a gate which is a negated input terminal of the operational amplifier and to which an output from an output terminal is negatively fed back.

Abstract: The present invention relates to a driving device, a driving method, and a light-emitting unit that make it possible to appropriately drive a light-emitting element. The driving device according to the present invention includes: a setting section (161) that sets at least one of a bias current of a light-emitting element (an LD 121) or a target current for setting output light from the light-emitting element (the LD 121) to desired intensity on the basis of a result of detection of an offset light amount when the light-emitting element (the LD 121) does not emit light; and an output controller (164) that controls an output of a driving current of the light-emitting element (the LD 121) on the basis of at least one of the set bias current or the set target current. The detection of the offset light amount is performed by a light-receiving element (a PD 122) that receives a portion of the output light. The present invention is applicable to a ranging module, for example.

Abstract: A light emitting device with a light emitter, an output unit, and a drive current supply wiring is provided. The light emitter, includes a plurality of light emitting elements. The output unit includes a plurality of output pads. The drive current supply wiring supplies the drive current from a power supply to the light emitting elements via the output pads, and includes an annular wiring, a common wiring, and a connection wiring. The annular wiring annularly surrounds and is connected to the plurality of output pads in a predetermined number of rows, and is arranged in a column direction of the output pads. The common wiring is on both sides in a direction orthogonal to an arrangement direction of a plurality of annular wirings and in parallel with the arrangement direction, and is connected to the power supply. The connection wiring connects the annular wiring and the common wiring.

Abstract: An object of the present invention is to reduce errors caused by changes in delay time when driving a light-emitting element. A light-emission driving device (10) includes: a light-emission current detection unit (401) (12); a phase difference detection unit (300); and a delay unit (200). The light-emission current detection unit (401) (12) detects a light-emission current for causing a light-emitting element (20) to emit light, the light-emission current being supplied from a light-emission driving unit (110). The phase difference detection unit (300) detects a phase difference between the detected light-emission current and a drive signal for controlling the supply of the light-emission current in the light-emission driving unit (110). The delay unit (200) adjusts propagation delay of the drive signal in accordance with the detected phase difference, and supplies the adjusted drive signal to the light-emission driving unit (110) as a drive signal.

Abstract: A detection circuit (20) according to the present disclosure includes a multiple-input one-output operational amplifier (30). The operational amplifier (30) includes a first transistor group (31) and a second transistor (32). The first transistor group (31) includes plural transistors connected in parallel such that operating voltages for plural light emitting elements (5) are inputted individually to gates of the plural transistors, the gates being non-negated input terminals of the operational amplifier. The second transistor (32) cooperates with the first transistor group (31) to form a differential configuration and has a gate which is a negated input terminal of the operational amplifier and to which an output from an output terminal is negatively fed back.

Abstract: A drive device according to the present disclosure includes a drive circuit (10) and a detection circuit (20). The drive circuit (10) drives a plurality of channels on an individual basis. The plurality of channels includes a plurality of light emitting elements (5). The detection circuit (20) collectively detects abnormalities of all the channels. Further, the drive device (10) is electrically and mechanically connected, with a plurality of microbumps (4), to a light emitting element array that includes the plurality of light emitting elements (5).

Abstract: A suppression of a rise in temperature is to be attained for a light source apparatus provided with an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed. A light source apparatus according to the present technology includes an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, and a driving section configured to cause the plurality of light-emitting elements of the emission section to emit light, in which at least a portion of a region including driving elements in the driving section is disposed so as not to overlap with the emission section.

Abstract: An abnormality of output laser light is detected for enhancement in safety. A light-source drive device includes a light-source control unit, a light-receiving unit, and an abnormality detection unit. The light-source control unit included in the light-source drive device controls light emission of a light source. The light-receiving unit included in the light-source drive device receives light from the light source through an output part allowing outward output of light of the light source. The abnormality detection unit included in the light-source drive device detects an abnormality of the light output from the output part, on the basis of the received light.

Abstract: A laser drive circuit is provided which includes: a first drive current unit (240) configured to adjust, by a first MOSFET (MN2) and a second MOSFET (MN3) being connected in series, an inflow of a current to a light-emitting element (LD11) that emits light in accordance with a current amount when the light-emitting element emits light and when the light-emitting element is extinguished; a voltage drop unit (MN4) configured to cause a gate-source voltage of the first MOSFET to drop when the light-emitting element is extinguished; and a timing generating unit (220) configured to generate a signal for controlling driving of the first drive current unit and the voltage drop unit.

Abstract: A light source apparatus is provided with the emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, the driving circuit section that causes the plurality of light-emitting elements of the emission section to emit light, the temperature detection section that includes a plurality of temperature sensors arranged to detect the temperature of the emission section, and a control section. The control section is configured to, during an emission target period when the light-emitting elements of the emission section are driven by the driving circuit section, correct a detection value from each of the plurality of temperature sensors by using a correction value set for each of the temperature sensors.

Abstract: The present invention relates to a driving device, a driving method, and a light-emitting unit that make it possible to appropriately drive a light-emitting element. The driving device according to the present invention includes: a setting section (161) that sets at least one of a bias current of a light-emitting element (an LD 121) or a target current for setting output light from the light-emitting element (the LD 121) to desired intensity on the basis of a result of detection of an offset light amount when the light-emitting element (the LD 121) does not emit light; and an output controller (164) that controls an output of a driving current of the light-emitting element (the LD 121) on the basis of at least one of the set bias current or the set target current. The detection of the offset light amount is performed by a light-receiving element (a PD 122) that receives a portion of the output light. The present invention is applicable to a ranging module, for example.

Abstract: A drive circuit and a drive current correcting method are described herein. The drive circuit comprises a current source that outputs a drive current, and a correction circuit that outputs a correction current. The correction circuit includes a first RC time constant circuit. An output terminal of the current source is connected to an output terminal of the correction circuit.

Abstract: A drive circuit and a drive current correcting method are described herein. The drive circuit comprises a current source that outputs a drive current, and a correction circuit that outputs a correction current. The correction circuit includes a first RC time constant circuit. An output terminal of the current source is connected to an output terminal of the correction circuit.

Abstract: An optical disk recording apparatus having (1) an optical pickup that emits laser light to illuminate a recording surface of an optical disk, receives reflected light resulting from the laser light reflected off the recording surface, and generates a light reception signal based on the thus received reflected light; (2) a laser power controller that sets a laser power setting and controls the power of the laser light emitted from the optical pickup based on the thus set laser power setting; and (3) a signal generator that, when a plurality of trial write areas provided on the recording surface of the optical disk are successively illuminated with the laser light in order to write trial write data, generates a timing notification signal that sets laser arrival timing when the laser light sequentially reaches trial write start positions of the plurality of trial write areas based on the light reception signal generated by the optical pickup.

Abstract: An optical disk recording apparatus includes an optical pickup that emits laser light to illuminate a recording surface of an optical disk, receives reflected light resulting from the laser light reflected off the recording surface, and generates a light reception signal based on the thus received reflected light; a laser power controller that sets a laser power setting and controls the power of the laser light emitted from the optical pickup based on the thus set laser power setting; and a signal generator that, when a plurality of trial write areas provided on the recording surface of the optical disk are successively illuminated with the laser light in order to write trial write data, generates a timing notification signal that notifies laser arrival timing when the laser light sequentially reaches trial write start positions of the plurality of trial write areas based on the light reception signal generated by the optical pickup.

Abstract: A semiconductor laser optical output control circuit able to precisely control an optical output of a semiconductor laser, provided with a peak value detection circuit 106-1 and a bottom value detection circuit 107-1 for detecting the output of a photo-diode PD 102, optical power setting voltage sources 105-1 and 105-2 for giving the setting value of the optical output of a semiconductor laser LD 101, a peak value detection circuit 106-2 and a bottom value detection circuit 107-2 for detecting the output of a switching circuit 104 for switching the setting value, error amplifiers 108-1 and 108-2 for comparing the detected outputs of the peak value detection circuit 106-1 and peak value detection circuit 106-2 and the bottom value detection circuit 107-1 and bottom value detection circuit 107-2, and a switching circuit 110 for switching the comparison results of the error amplifiers 108-1 and 108-2 and supplying the same to a current amplifier 111 in synchronization with the switching circuit 104.

Abstract: A semiconductor laser optical output control circuit able to precisely control an optical output of a semiconductor laser, provided with a peak value detection circuit 106-1 and a bottom value detection circuit 107-1 for detecting the output of a photo-diode PD 102, optical power setting voltage sources 105-1 and 105-2 for giving the setting value of the optical output of a semiconductor laser LD 101, a peak value detection circuit 106-2 and a bottom value detection circuit 107-2 for detecting the output of a switching circuit 104 for switching the setting value, error amplifiers 108-1 and 108-2 for comparing the detected outputs of the peak value detection circuit 106-1 and peak value detection circuit 106-2 and the bottom value detection circuit 107-1 and bottom value detection circuit 107-2, and a switching circuit 110 for switching the comparison results of the error amplifiers 108-1 and 108-2 and supplying the same to a current amplifier 111 in synchronization with the switching circuit 104.