Yoshikazu Sasaki
Yoshikazu Sasaki, Ukyo-Ku JP
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20110080989 | START-UP CIRCUIT AND START-UP METHOD - A start-up circuit receives a start-up signal instructing start-up of an equipment mounted with the circuit, and executes a predetermined sequence when start-up is instructed by the start-up signal. An oscillator generates a clock signal. A sequence circuit receives the start-up signal and a clock signal output from the oscillator, measures time by counting the clock signal when the start-up signal transits to a predetermined level, and executes a predetermined event at a predetermined timing. The oscillator operates for a period where the start-up signal is at the predetermined level if the start-up signal is at the predetermined level during the period the power key of the equipment mounted with the circuit is being pushed. | 04-07-2011 |
20120274877 | CIRCUIT AND METHOD FOR DRIVING LED STRING FOR BACKLIGHT, AND BACKLIGHT AND DISPLAY DEVICE USING THE CIRCUIT - An LED driving circuit drives a display backlight LED string including multiple LEDs connected in series. A power supply supplies a driving voltage from an output terminal thereof to a first end of the LED string. A detection resistor is arranged between a second end of the LED string and a fixed voltage terminal. The LED driving circuit receives a pulse modulation signal having a duty ratio that corresponds to the luminance. In the on period, in which the PDIM signal is the first level, the LED driving circuit controls the power supply such that the voltage drop across the detection resistor approaches a predetermined target value. In the off period, in which the PDIM signal is the second level, the LED driving circuit stops the control operation for the power supply. | 11-01-2012 |
20140218657 | CONTROL CIRCUIT FOR LIGHT EMITTING APPARATUS - An error amplifier amplifies the difference between a first detection voltage V | 08-07-2014 |
Yoshikazu Sasaki, Aichi JP
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20110043470 | SENSOR DEVICE, METHOD OF DRIVING SENSOR ELEMENT, DISPLAY DEVICE WITH INPUT FUNCTION AND ELECTRONIC UNIT - A sensor device includes: one or more sensor elements each including first and second diode elements connected in series and a sensor driving section. The cathode of the second diode element is connected to the anode of the first diode element. The sensor driving section controls on-off state of the first diode element through changing a gate voltage under a fixed cathode voltage, and controls on-off state of the second diode element through changing a gate voltage under a fixed anode voltage. The sensor driving section drives the second diode element, maintaining a relationship of Vg | 02-24-2011 |
20120007988 | IMAGING DEVICE, DISPLAY-IMAGING DEVICE, AND ELECTRONIC EQUIPMENT - Disclosed herein is an imaging device including: a plurality of photodetecting elements arranged on a substrate, each having a first semiconductor layer for the channel region; and a plurality of driving elements arranged on the substrate, each having a second semiconductor layer for the channel region, wherein the first and second semiconductor layers each are a crystallized semiconductor layer, the first and second semiconductor layers each are approximately equal in thickness and impurity concentration, and the first and second semiconductor layers each have an average trap level density no higher than 2.0×10 | 01-12-2012 |
Yoshikazu Sasaki, Kyoto JP
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20090108827 | UNDER VOLTAGE LOCK OUT CIRCUIT AND METHOD - An under voltage lock out circuit which monitors an input voltage and executes a predetermined sequence when the input voltage satisfies a predetermined condition may include a voltage comparison unit which compares the input voltage and a predetermined threshold voltage, and outputs a comparison signal; a logic circuit which receives the comparison signal output from the voltage comparison unit and a start-up signal instructing start-up of an equipment mounted with the under voltage lock out circuit, and asserts a sequence control signal when start-up is instructed by the start-up signal in a state the input voltage is higher than the threshold voltage; and a sequence circuit which executes a predetermined sequence when the sequence control signal is asserted, wherein the predetermined threshold voltage is switched according to the sequence control signal. | 04-30-2009 |
20100231270 | SWITCHING OUTPUT CIRCUIT - A high-side transistor and a low-side transistor each has gate electrodes configured so as to allow signals to be input and output via a driving contact and a detection contact provided at different positions. When a control signal is at a first level and a signal output from the detection contact on the low-side transistor side is at a low level, the high-side driver applies a low-level signal to the driving contact on the high-side transistor side. When the control signal is at a second level and a signal output from the detection contact on the high-side transistor side is at a high level, the low-side driver applies a high-level signal to the driving contact on the low-side transistor side. | 09-16-2010 |
20120075544 | DRIVING CIRCUIT FOR LIGHT EMITTING DEVICE - A driving circuit is provided, which is configured to supply a driving voltage and a driving current to an LED string. A first detection resistor is arranged on a path of the LED string. A voltage source outputs a control voltage having a level that corresponds to the target luminance level of the LED string, and a first threshold voltage that is proportional to the control voltage. A controller generates a gate pulse signal having a duty ratio that is adjusted such that the voltage drop across the first detection resistor matches the control voltage. A first driver drives a switching transistor of a DC/DC converter according to the gate pulse signal. When the voltage drop across the first detection resistor exceeds the first threshold voltage, a first comparator stops the switching operation of the switching transistor. | 03-29-2012 |
20130250215 | DRIVING CIRCUIT FOR LIGHT-EMITTING ELEMENT - A detection resistor is arranged on a path of an LED string. A controller generates a gate pulse signal having a duty ratio adjusted such that the voltage drop at the detection resistor matches a predetermined reference voltage. Furthermore, the controller receives a dimming control signal which indicates the duty ratio of the burst dimming operation, and generates a corresponding burst dimming pulse. According to the gate pulse signal, the first driver drives an output circuit configured to generate a driving voltage. A second driver switches a path of a driving current between connection and disconnection according to the burst dimming pulse. A duty ratio detection unit controls the frequency of the gate pulse signal according to the duty ratio indicated by the dimming control signal. | 09-26-2013 |
20140125246 | CONTROL CIRCUIT FOR LIGHT EMITTING APPARATUS - A first driver switches on and off a driving current I | 05-08-2014 |
Yoshikazu Sasaki, Yokkaichi-Shi JP
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20090242266 | Electric Connection Box - Fluid drainage slopes are formed at a lower frame part constituting a housing that is provided below circuit board housed inside housing. Drainage ports are also formed at a lowermost part of fluid drainage slope in lower frame part. Thus, fluid that forms in the housing flows down from circuit board and onto fluid drainage slopes to be guided downward from fluid drainage slope to reach drainage ports and be discharged to outside housing. It is thus possible to prevent or suppress the occurrence of short circuits in a circuit board caused by fluid generated and/or accumulated inside the housing. | 10-01-2009 |
20090298309 | Electric Connection Box - A circuit structure | 12-03-2009 |
20100039753 | Electric Power Distribution System - There is a concern that water on the top surface of a cover | 02-18-2010 |
Yoshikazu Sasaki, Osaka JP
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20090060492 | PORTABLE DEVICE WITH HEAT RADIATING STRUCTURE - In a digital camera implementing the present invention, a metal tripod seat is arranged on a cabinet, a circuit part that generates heat is accommodated in the cabinet, the circuit part is connected with the tripod seat in a heat conducting manner, and a cover strip made of resin extending from the cabinet covers the tripod seat. The tripod seat is arranged at one end of the cabinet, and the outer surface of the cabinet has a projection formed at a site facing the circuit part, and forms a heat radiating space allowing flow of heat to the other end of the cabinet with the circuit part. | 03-05-2009 |
Yoshikazu Sasaki, Kyoto-Shi JP
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20090045789 | POWER SUPPLY CIRCUIT - A power supply circuit includes a standard voltage generator; a regulator to control an output voltage, and to be capable of being switched ON/OFF; a capacitor in parallel between the standard voltage generator and the regulator; a discharging circuit including a first switch and a second switch configured to discharge electrical charges from the capacitor via the second switch while the regulator is in an OFF state; and a starting controller configured to transmit a signal for controlling the first switch and the second switch. The first switch is connected in series between the standard voltage generator and the regulator. The second switch has one end connected to a connection node between the first switch and the regulator, and has another end connected to a ground. When the first switch is in OFF state, the second switch is turned to ON state while the regulator is in OFF state. | 02-19-2009 |