Patent application number | Description | Published |
20100045193 | ORGANIC ELECTROLUMINESCENT LIGHT EMITTING DEVICE FOR RESTORING NORMAL OPERATION AFTER LOW-VOLTAGE ERRORS - Provision of a light emitting device having functionality for restoring to normal even if a low-voltage error occurs, by temporarily applying a reverse current to a low-voltage error light emitting element using a direction inverting circuit, and repairing portions in which impedance has fallen by applying the current. | 02-25-2010 |
20100156308 | ADJUSTABLE OUTPUT BALLAST FOR POWERING BOTH FLUORESCENT LAMPS AND LED LAMPS - A ballast is provided for powering either of a fluorescent lamp or an LED lamp. The ballast includes a power supply and a pair of switching elements connected in series and coupled across an output end of the power supply. A voltage is provided across a pair of lamp output terminals coupled to the switching elements during a predetermined time period after startup of the ballast. A current condition is detected across the pair of lamp output terminals during the predetermined time period. Based on the detected current condition, the presence of a fluorescent lamp or an LED lamp connected to the ballast may be determined, and either of a first or second voltage output is provided across the lamp output terminals suitable for powering the appropriate lamp after lapsing of the predetermined time period. | 06-24-2010 |
20100219768 | LIGHT CONTROL APPARATUS AND LIGHTING APPLIANCE USING THE SAME - It is an object to provide a light control apparatus and a lighting appliance using the same which enable to increase luminous efficiency in the light control. The lighting appliance includes a light source and a light control apparatus. The light control apparatus includes an electric current output circuit which outputs a constant electric current for lighting to a light source configured of an organic electroluminescence device, an electric current control circuit which controls an intensity of a driving electric current outputted from the electric current output circuit, and the electric current control circuit biases a direct current component so as to vary the driving electric current periodically between a predetermined maximum value and a predetermined minimum value and flows in the same direction at all times in the light control of the light source. | 09-02-2010 |
20100244704 | LIGHT CONTROL APPARATUS AND LIGHTING APPLIANCE USING THE SAME - It is objected to provide a light control apparatus and a lighting appliance using the same which enable to increase luminous efficiency in the light control and to elongate operative life of a light source. The lighting appliance comprises a light source | 09-30-2010 |
20110101875 | LIGHT EMITTING DEVICE - A light emitting device includes: a plurality of light emitting elements configured to emit light when a direct current is supplied thereto; and a direct current power supply circuit configured to supply an electric current of a given level or more to the light emitting elements. The light emitting device further includes: a light emitting element voltage detection circuit configured to detect a voltage applied to the light emitting elements; and a forward/reverse inverting circuit configured, when the light emitting element voltage detection circuit detects an abnormality in a light emitting element, to apply a reverse voltage to the light emitting element in which the abnormality is detected. | 05-05-2011 |
20110169422 | PLANAR LIGHT-EMITTING MODULE LIGHTING CIRCUIT AND ILLUMINATING DEVICE - A planar light-emitting module lighting circuit uses a lamp comprising an organic electroluminescence layer and electrodes sandwiching the organic electroluminescence layer as a load, and applies a current to the load so as to cause the organic electroluminescence layer to emit light. In the planer light-emitting module lighting circuit, a current at a lighting start time of the lamp is made small as compared with a current at a stationary lighting time at which a predetermined time period has passed since a lighting start. | 07-14-2011 |
20130015784 | ILLUMINATION LIGHT COMMUNICATION DEVICE, AND ILLUMINATION APPARATUS AND SYSTEM INCLUDING SAMEAANM KAMADA; MasaoAACI OsakaAACO JPAAGP KAMADA; Masao Osaka JPAANM SHIOHAMA; EijiAACI OsakaAACO JPAAGP SHIOHAMA; Eiji Osaka JPAANM NISHINO; HiroyukiAACI OsakaAACO JPAAGP NISHINO; Hiroyuki Osaka JPAANM MAEHARA; MinoruAACI OsakaAACO JPAAGP MAEHARA; Minoru Osaka JPAANM HASITANI; YosiakiAACI OsakaAACO JPAAGP HASITANI; Yosiaki Osaka JPAANM KONDO; YosukeAACI OsakaAACO JPAAGP KONDO; Yosuke Osaka JP - An illumination light communication device includes a light source unit including light emitting elements; a power supply unit controlling a load current flowing through the light source unit to be maintained at a constant; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light. The control unit has a switching circuit to open/close a path between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light in synchronization with an ON time of the switching circuit. | 01-17-2013 |
20130015785 | ILLUMINATION LIGHT COMMUNICATION DEVICE, AND ILLUMINATION APPARATUS AND SYSTEM INCLUDING SAMEAANM KAMADA; MasaoAACI OsakaAACO JPAAGP KAMADA; Masao Osaka JPAANM SHIOHAMA; EijiAACI OsakaAACO JPAAGP SHIOHAMA; Eiji Osaka JPAANM NISHINO; HiroyukiAACI OsakaAACO JPAAGP NISHINO; Hiroyuki Osaka JPAANM MAEHARA; MinoruAACI OsakaAACO JPAAGP MAEHARA; Minoru Osaka JPAANM HASITANI; YosiakiAACI OsakaAACO JPAAGP HASITANI; Yosiaki Osaka JPAANM KONDO; YosukeAACI OsakaAACO JPAAGP KONDO; Yosuke Osaka JP - An illumination light communication device includes a power supply unit controlling a load current in a light source unit to be maintained constant based on a dimming signal; an impedance unit series connected to the light source unit; a switch element parallel connected to the impedance unit to connect/disconnect the impedance unit with the light source unit; and a control unit controlling on/off of the switch element to modulate a light intensity of the light source unit such that a binary communication signal is superimposed on illumination light therefrom. The control unit controls the impedance of the impedance unit such that a difference between magnitudes of the load currents respectively when the pulse of the communication signal is superimposed and is not superimposed is maintained constant regardless of a dimming rate of the dimming signal in a range of a dimming rate equal to or greater than a predetermined level. | 01-17-2013 |