Patents Assigned to New Focus
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Patent number: 9977089Abstract: A charger system for battery starting current test, comprising: a battery equivalent circuit comprising a battery internal resistance R0 and an electromotive force E connected in series, two ends of the battery equivalent circuit are connected to a first signal and a second signal, respectively; a signal drive circuit, comprising a first DC output signal and a second DC output signal, and a first load circuit and a second load circuit configured between the first DC output signal and the second DC output signal, each load circuit is connected to the battery equivalent circuit and controlled by a first drive signal and a second drive signal; an intermediate resistor R28, configured between the signal drive circuit and the battery equivalent circuit. This invention uses the above technical solution to test the internal resistance of the battery, and find out the CCA value of the battery via the internal resistance correspondingly.Type: GrantFiled: November 21, 2014Date of Patent: May 22, 2018Assignee: New Focus Lighting & Power Technology (Shanghai) Co., Ltd.Inventors: Yu Liu, Shiquan Gong, Jianxing Zhang
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Publication number: 20140126262Abstract: An inverter circuit includes a DC-AC inverter, a sampling circuit, a voltage-current conversion circuit, an isolation circuit and an electronic starter switch. The sampling circuit includes a first and a second diode connected in parallel and opposite in polarity. A forward voltage drop at the first diode blocks the conductance of a first transistor of the voltage-current conversion circuit when there is no load, and a forward voltage drop at the second diode turns on the first transistor when there is a load. The connection of the first and second diodes to a second AC output terminal of the DC-AC inverter nearly has no impact on the AC output of the inverter circuit. These enable the inverter circuit to have low power consumption when there is no load and to be immediately activated upon connection of a load, thereby achieving detection of a load smaller than 0.1 W.Type: ApplicationFiled: July 15, 2011Publication date: May 8, 2014Applicant: New Focus Lighting & Power Technology (Shanghai) Co., Ltd.Inventors: Yuancheng Lu, Weibi Hong
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Publication number: 20120153747Abstract: The present invention discloses a switch control system and its method for a USB charger, wherein the switch control system controls the on-off status of the charging circuit according to whether a charging load is connected or not. The switch control system comprises a first switch and an on-off control unit of the first switch. The first switch connects to a charging power and a converter; the on-off control unit of the first switch connects to the USB output interface and the first switch to control the on-off status of the first switch according to whether the charging load is connected or not. The switch control system and the method for the USB charger disclosed by the present invention realize automatic switching on and off of the USB operating circuit when a load is connected to or removed from the USB output interface.Type: ApplicationFiled: November 26, 2009Publication date: June 21, 2012Applicant: New Focus Lighting & Power Technology (Shanghai) Co. Ltd.Inventors: Yuancheng Lu, Weibi Hong
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Patent number: 7345876Abstract: The present invention discloses a compact converter including a compact casing having an air inlet defined thereon, a printed circuit board supported within the compact casing at a position between a top and a bottom wall of the compact casing to form an upper air channel between the printed circuit board and the top wall of the compact casing and a lower air channel between the printed circuit board and the bottom wall of the compact casing, wherein the lower air channel is communicating with the upper channel; a cooling fan is electrically mounted on the printed circuit board at a position aligning with the air inlet for drawing exterior air through the air inlet to the lower air channel to create an air circulation between the lower air channel and the upper air channel, so as to cool down the printed circuit board.Type: GrantFiled: December 9, 2005Date of Patent: March 18, 2008Assignee: New Focus Lighting and Power Technology (Shanghai) Co., LtdInventors: Weibi Hong, Yuancheng Lu
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Patent number: 7280568Abstract: An apparatus and method for linewidth broadening applied to a laser that emits a light having an output frequency ? and an emission linewidth ?E. The apparatus is equipped with an electro-optic modulator for intercepting the light and a noise generator for driving the electro-optic modulator with a radio-frequency (RF) noise signal spanning a frequency range selected to broaden the emission linewidth ?E of the light passing through the electro-optic modulator to a broadened linewidth ?B. The noise spectrum of the noise signal exhibits a continuous frequency range and can be flat or sloping. The range extends from low frequency ?L set below the emission linewidth ?E of the light to a high frequency ?H set above the emission linewidth ?E of the light. The electro-optic modulator can be selected from among many suitable devices including optical crystals. Further broadening can be achieved by employing one or more secondary EOMs operating in resonant or non-resonant modes.Type: GrantFiled: August 29, 2003Date of Patent: October 9, 2007Assignee: New Focus, Inc.Inventor: Robert S. Williamson, III
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Patent number: 7092644Abstract: An optical receiver may include a photodetector that is configured to generate an electrical signal in response to detecting an optical signal, a first gain path coupled to receive and amplify the electrical signal generated by the photodetector, and a second gain path coupled to receive and amplify the electrical signal generated by the photodetector. The second gain path may have a higher gain than the first gain path. The two gain paths may be configured to amplify the electrical signal independently of each other. The optical receiver may also include a switch that selectably outputs an amplified electrical signal from one of the gain paths based on a magnitude of a signal corresponding to the optical signal.Type: GrantFiled: September 28, 2001Date of Patent: August 15, 2006Assignee: New Focus, Inc.Inventor: Andrew Davidson
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Patent number: 6987626Abstract: An optical component mount with beam deviation monitoring and beam guiding system using such optical component mounts. The optical component mount has a location for mounting an optical element thereon for operating on the beam and at least one sensor attached to the optical mount at a predetermined position to at least one mode of the optical component mount. The predetermined position is selected depending on the state of the optical component mount. The state can be, e.g., a vibrational state or a thermal expansion state. The predetermined position is chosen near or at an anti-node of at least one mode contributing to the state. The state of the optical mount is determined based on the signals obtained from the at least one sensor, which can be an accelerometer in the case of monitoring a vibrational state or a temperature sensor in the case of monitoring a thermal expansion state.Type: GrantFiled: March 20, 2003Date of Patent: January 17, 2006Assignee: New Focus, Inc.Inventor: Evan D. H. Green
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Patent number: 6940879Abstract: A tunable external cavity laser equipped with an optical path length compensator for adjusting an optical path length of the cavity, a wavelength selector for selecting an operating wavelength of the light in a single longitudinal mode and a dispersion compensator for compensating a dispersion of the light. In order to achieve mode-hop-free tuning the laser has a synchronizer for synchronizing the optical path length compensator, the wavelength selector and the dispersion compensator to maintain the light in the selected single longitudinal mode while the wavelength selector tunes the operating wavelength. The laser employs a pair of prisms and a wedge filter or a gap filter to perform the functions of the optical path length compensator, the wavelength selector and the dispersion compensator.Type: GrantFiled: December 6, 2002Date of Patent: September 6, 2005Assignee: New Focus, Inc.Inventor: Guangzhi G. Zhang
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Patent number: 6911763Abstract: A mover assembly (16) that moves or positions an object (12) includes a mover output (226), an actuator (230), and a measurement system (20). The mover output (226) is connected to the object (12), and the actuator (230) causes the mover output (226) to rotate about a first axis and move along the first axis. In this embodiment, the measurement system (20) directly measures the movement of the mover output (226) and provides feedback regarding the position of the mover output (226).Type: GrantFiled: May 30, 2003Date of Patent: June 28, 2005Assignee: New Focus, Inc., a Delaware CorporationInventors: Andrew Ziegler, David F. Arnone, Evan Drake Harriman Green
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Patent number: 6788726Abstract: A laser apparatus and method that provide for suppression of source spontaneous emission (SSE) and amplified spontaneous emission (ASE) light in laser output with minimal intracavity loss. The apparatus comprises a gain medium emitting a light beam, a wavelength element positioned in the light beam, and a non-reciprocal pickoff positioned in the light beam between the gain medium and wavelength element. The non-reciprocal pickoff may comprise a polarization-dependent beam splitter and a non-reciprocal polarization rotator positioned in the light beam before the wavelength selection element. The non-reciprocal pickoff may further comprise a reciprocal polarization rotator positioned in the light beam after the polarization-dependent beam splitter.Type: GrantFiled: February 26, 2002Date of Patent: September 7, 2004Assignee: New Focus, Inc.Inventors: Guangzhi Z. Zhang, Carter F. Hand, Alejandro D. Farinas, Murray Reed
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Patent number: 6707231Abstract: A method and apparatus for controlling a piezo-electric actuator coupled to a driven member is disclosed. The piezo-electric actuator is responsive to waveforms with asymmetrical voltage/current profiles on the rising and falling edge to effect consistent and cumulative movement of the driven member in one of two directions throughout the reciprocations of the piezo-electric actuator. The waveforms are digitally generated from a stored set of numbers or a function for generating the set of numbers. The numbers correspond with the discrete digital values associated with the desired waveforms for moving the driven member in either of at least two directions. The controller may be used to drive more than one piezo-electric actuator. The controller may include responsiveness to a feedback of the position of the driven member to accurately position the driven member.Type: GrantFiled: July 24, 2002Date of Patent: March 16, 2004Assignee: New Focus, Inc.Inventors: John Pease, Sherwin D. Cabatic, Dennis E. Melvin
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Patent number: 6632029Abstract: The present invention provides a method and apparatus for packaging high frequency electrical and/or electro-optical components. The present invention provides a package which may be surface mounted on a board with other electrical components. The shielding provided by the package minimizes electromagnetic interference with other electrical components on the board. The package includes a controlled impedance I/O interface for coupling with the electrical and/or electro-optical component(s) in the package. The package interface may also include a differential I/O capability to further control electromagnetic fields generated at the interface. Additionally, the package may include an optical link provided by one or more optical fibers extending from the package.Type: GrantFiled: April 20, 2000Date of Patent: October 14, 2003Assignee: New Focus, Inc.Inventors: Robert S. Williamson, III, Robert A. Marsland
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Patent number: 6625183Abstract: Apparatus and methods that provide a tunable laser output wavelength which varies linearly or with high predictability over time, and which can provide tuning speeds of greater than 100 nanometers per second. The apparatus includes a laser resonator cavity having first and second reflective elements, at least one of which is movable to provide a constant change in output wavelength with respect to time. A tuning assembly associated with the movable reflective element is structured, configured, and positioned to adjust the movable reflective elements such that constant changes in output wavelength and high tuning speeds are provided.Type: GrantFiled: January 31, 2000Date of Patent: September 23, 2003Assignee: New Focus, Inc.Inventors: Carter F. Hand, Bruce Jenket, Jan-Willem Pieterse, Mark Wippich, Khiem Do
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Patent number: 6614829Abstract: The present invention provides an apparatus for mechanically stabilizing tunable lasers by mechanically grounding laser components. Lasers stabilized using mechanical grounding of the laser components exhibit phase synchronous tuning, reduced mode hop and increased wavelength stability across the entire tuning range. Additionally, lasers stabilized using mechanical grounding exhibit improved resistance to thermal and physical shock. The robust compact design of mechanically grounded lasers makes them suitable for a broad range of applications including optical signal generators and optical multimeters.Type: GrantFiled: September 10, 1999Date of Patent: September 2, 2003Assignee: New Focus, Inc.Inventors: Alexander V. Tuganov, I-Fan Wu, Michael Brownell, Timothy Day
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Patent number: 6608847Abstract: A laser apparatus and method with compact cavity design that provides suppression of source spontaneous emission (SSE) and amplified spontaneous emission (ASE) light with minimal loss. The laser comprises a gain medium emitting a light beam along an optical path, a tuning element positioned in the optical path and configured feed back light of a selected wavelength to the gain medium and configured to define a first output beam directed along a first output path, a partial reflector located in the optical path and positioned to create a second output beam directed along a second output path substantially parallel to the first output path; and having a spontaneous emission component that is spatially separated from the selected wavelength. The second output beam can be coupled into optical fiber and produce a coherent light source with high spectral purity and tunable wavelengths.Type: GrantFiled: September 28, 2001Date of Patent: August 19, 2003Assignee: New Focus, Inc.Inventors: Guangzhi Z. Zhang, Andrew Davidson, David Robinson, Carter Hand, Mark Wippich, Murray Reed, Weizhi Wang
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Patent number: 6606340Abstract: Disclosed is an external cavity diode laser system that includes a dispersion unit; a gain element producing coherent light incident upon the dispersion unit; and the dispersion unit dispersing the incident coherent light into dispersed light, the dispersed light comprising a reflected diffraction beam and at least one of angularly-separated source spontaneous emission or angularly-separated amplified spontaneous emission; a guiding dispersion unit that guides the dispersed light diffracted upon it from the dispersion unit while maintaining an angular separation between the reflected diffraction beam and at least one of angularly-separated source spontaneous emission or angularly-separated amplified spontaneous emission; and a physical filtering device that physically filters the reflected diffraction beam from the spatially separated at least one of angularly-separated source spontaneous emission or angularly-separated amplified spontaneous emission guided to the physical filtering device by the guiding unitType: GrantFiled: March 23, 2001Date of Patent: August 12, 2003Assignee: New Focus, Inc.Inventors: Guangzhi Z. Zhang, I-Fan Wu
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Publication number: 20030138212Abstract: Disclosed is a microbend fiber optic coupler and a method of forming same. The microbend fiber optic coupler includes two pairs of pigtail ends oriented one beside the other and having a bent fused biconically tapered coupling region interposed therebetween.Type: ApplicationFiled: January 16, 2003Publication date: July 24, 2003Applicant: New Focus, Inc., a California CorporationInventor: Peter Z. Chen
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Publication number: 20030138024Abstract: The present invention provides a method and apparatus for transmission of optical communications. The present invention provides an optical transmitter which includes a control circuit to enhance the stability of output power levels, a modulator circuit with precise impedance matching for high frequency performance, and an optical coupling mechanism that relaxes the alignment tolerances between the laser and the fiber and decreases the sensitivity of the gain medium to feedback from devices coupled to the fiber. These features allow the transmitter to deliver an optical output beam which can be modulated over a wide range of frequencies, duty cycles and amplitudes with very precise definition of the rising and falling edges of the waveform. In combination these features result in an optical transmitter that may be fabricated with relatively low cost and a reduced form factor when compared with prior art optical transmitters.Type: ApplicationFiled: January 15, 2003Publication date: July 24, 2003Applicant: New Focus, Inc.Inventors: Robert S. Williamson, Robert A. Marsland, Mark Rodwell
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Patent number: D561321Type: GrantFiled: August 29, 2005Date of Patent: February 5, 2008Assignee: New Focus Lighting and Power Technology ( Shanghai) Co., LtdInventor: Weibi Hong
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Patent number: D561322Type: GrantFiled: November 14, 2005Date of Patent: February 5, 2008Assignee: New Focus Lighting and Power Technology Co., Ltd.Inventor: Weibi Hong