Patent application number | Description | Published |
20130076246 | LIGHTING CIRCUIT FOR LIGHT EMITTING ELEMENT AND ILLUMINATION APPARATUS INCLUDING SAME - A light-emitting-element lighting circuit for dimming a light emitting element having a diode characteristic by a PWM dimming signal is provided. The lighting circuit includes a dimming signal conversion unit configured to generate the PWM dimming signal having a duty ratio corresponding to an emission level specified by an input dimming signal. The lighting circuit further includes a minimum current generating circuit configured to flow a minimum current during an OFF period of the PWM dimming signal generated by the dimming signal conversion unit such that a voltage greater than a threshold voltage designed to allow the light emitting element to emit a light is applied to the light emitting element, and the light emitting element emits a light of a brightness equal to or less than a lowest emission level specified by the dimming signal. | 03-28-2013 |
20130127339 | ORGANIC EL ILLUMINATION MODULE AND ILLUMINATION APPARATUS INCLUDING SAME - An organic EL module includes a flat plate-like light emitting panel configured to use an organic EL element; and a holding member configured to hold the light emitting panel. The holding member includes: a conductive member serving as at least a part of the holding member, and a capacitance component is provided between the conductive member and an electrode layer, the electrode layer being provided in the light emitting panel to supply a driving voltage thereto. | 05-23-2013 |
20130127366 | LIGHTING CIRCUIT FOR LIGHT EMITTING ELEMENT AND ILLUMINATION APPARATUS INCLUDING SAME - A light-emitting-element lighting circuit for dimming a light emitting element by a PWM dimming signal of a duty ratio corresponding to an input dimming signal is provided. The lighting circuit includes a PWM dimming signal generating unit which generates the PWM dimming signal by performing a summation of AC wave signals including a fundamental wave and harmonics of different frequencies that are integer multiples of a fundamental frequency of the fundamental wave. The fundamental frequency is equal to or higher than a frequency, at which a sound pressure level is at maximum, in an audible frequency range in a correlation spectrum between the sound pressure level generated from the light emitting element and a frequency of an AC wave signal inputted to the light emitting element. | 05-23-2013 |
20140071680 | LIGHTING APPARATUS AND LIGHTING APPARATUS ASSEMBLY USING THE SAME - A lighting apparatus includes a light-emission unit having plate shape; and a base unit configured to be detachably attached thereto the light-emission unit. The base unit has substantially rectangular shape. The base unit includes a power supply rail for supplying electricity to the light-emission unit and a support section supporting the light-emission unit. The power supply rail has rail-shape and extending in a longitudinal direction of the base unit. The light-emission unit includes a luminescent panel, a control circuit configured to control lighting of the luminescent panel and an electrically conductive connection terminal electrically connecting the control circuit to the power supply rail. The base unit is formed so as to be capable of being attached thereto a plurality of the light-emission units along the longitudinal direction of the base unit. The connection terminal is connected to an arbitrary point of the rail-shaped power supply rail. | 03-13-2014 |
20150028772 | LIGHT-EMITTING ELEMENT LIGHTING DEVICE, LIGHT-EMITTING MODULE, ILLUMINATING APPARATUS, AND LIGHT-EMITTING ELEMENT LIGHTING METHOD - A light-emitting element lighting device includes: a step-down chopper circuit which outputs a current that flows to a light-emitting element; a current command circuit which selects between a rated mode for passing a rated current for turning ON the light-emitting element and a detection mode for passing an abnormality detection current, which is smaller than the rated current, for detecting an abnormality in the light-emitting element; a voltage detection circuit which detects a voltage across both ends of the light-emitting element; and a control circuit which causes the step-down chopper circuit to stop outputting the current to the light-emitting element, when the voltage across both ends detected by the voltage detection circuit in the detection mode is lower than or equal to an abnormality detection threshold voltage which is set lower than the rated voltage at the time when the light-emitting element is turned ON. | 01-29-2015 |
20150028774 | LIGHT-EMITTING ELEMENT LIGHTING DEVICE, LIGHT-EMITTING MODULE, ILLUMINATING APPARATUS, AND LIGHT-EMITTING ELEMENT LIGHTING METHOD - A light-emitting element lighting device includes: a step-down chopper circuit which outputs current to a light-emitting element; a current command circuit which selects between (i) light-emission mode for causing a light-emission current larger than a constant rated current, which flows to the light-emitting element when continuous light-emission is caused, to flow and (ii) detection mode for causing an abnormality detection current smaller than the rated current, to flow for detecting a light-emitting element abnormality; a voltage detection circuit which detects a both-end voltage of the light-emitting element; and a control circuit which causes the step-down chopper circuit to stop outputting the current to the light-emitting element, when the both-end voltage detected by the voltage detection unit in the detection mode is lower than or equal to an abnormality detection threshold voltage which is set lower than the rated voltage at a time when the light-emitting element is turned ON. | 01-29-2015 |
20150230317 | LIGHT EMITTING MODULE AND ILLUMINATION DEVICE USING THE SAME - A light emitting module includes light source units having a rectangular plate shape, and a base unit having an elongated rectangular plate shape. The light source units are disposed along a straight line and removably mounted to the base unit. Each of the light source units includes a pair of engaging portions used in bringing each of the light source units into engagement with the base unit. The engaging portions are disposed in two opposite sides of a mounting surface of each of the light source units to be mounted to the base unit. The base unit includes holding portions provided along a longitudinal direction of the base unit on an attachment surface of the base unit to which the light source units are attached and holding-portion-attachment portions to which the holding portions are detachably attached at a predetermined interval along the longitudinal direction of the base unit. | 08-13-2015 |
20150377459 | LIGHT EMITTING MODULE AND ILLUMINATING DEVICE USING SAME - The light emitting module includes a light source unit and a base plate where the light source unit is detachably mounted. The light source unit has an installation mechanism for installation to the base plate, and the base plate has an installation mechanism counterpart engaged with the installation mechanism. In addition, the light emitting module has a hook mechanism that catches the light source unit and the base plate when the installation mechanism and the installation mechanism counterpart are not engaged with each other. The hook mechanism is contained within a thickness of the light source unit when the light source unit is mounted to the base plate. In this configuration, it is possible to prevent the light source unit from dropping from the base plate using the hook mechanism even when engagement between the installation mechanism and the installation mechanism counterpart is released. | 12-31-2015 |