Abstract: In the illumination device of the invention, an LED is oppose to a side surface of a flat light guide member. A light shield surface for shielding light from the LED and emitted toward the backside of the guide member in vicinity of the LED on the backside of the light guide member.

Abstract: The invention is directed to provide a vehicle interior illumination device which has a high illuminating effect and which can be used for various kinds of illumination in a vehicle. The illumination device disposed in a roof portion of the interior of a vehicle, including: a first light-emitting section having a first light source constituted by a plurality of first LEDs disposed at substantially regular spaces; and a second light-emitting section having a second light source constituted by a second LED, and a second outer lens with which a light emission side of the second light source is covered and by which light emitted from said second light source is converged and radiated out.

Abstract: An apparatus is constructed by accommodating in one dust-proof room 11, a concave-mold first cleaning device 21 which abrades the convex-surface forming surface 101 of a concave mold 1, a concave-mold second cleaning device 22, a concave-mold drying device 23, a convex-mold first cleaning device 24 which abrades a concave-surface forming surface for a lens, a convex-mold second cleaning device 25, a convex-mold drying device 26, an inversion device 30 which inverts the concave mold 1 or a convex mold 2 up or down, a positioning device 50 which brings the geometric centers of the concave mold 1 and the convex mold 2 into coincidence and then arranges them in opposition, and a tape winding device 60 which winds an adhesive tape onto the peripheral surfaces of the concave mold 1 and convex mold 2 so as to seal the gap between these molds, thereby to provide the lens-casting-mold assembling apparatus which can efficiently assemble a lens-casting-mold assembly, and which saves space.

Abstract: The invention is directed to provide a vehicle interior illumination device which has a high illuminating effect and which can be used for various kinds of illumination in a vehicle. The illumination device disposed in a roof portion of the interior of a vehicle, including: a first light-emitting section having a first light source constituted by a plurality of first LEDs disposed at substantially regular spaces; and a second light-emitting section having a second light source constituted by a second LED, and a second outer lens with which a light emission side of the second light source is covered and by which light emitted from said second light source is converged and radiated out.

Abstract: The invention is directed to provide a vehicle interior illumination device which has a high illuminating effect and which can be used for various kinds of illumination in a vehicle. The illumination device disposed in a roof portion of the interior of a vehicle, including: a first light-emitting section having a first light source constituted by a plurality of first LEDs disposed at substantially regular spaces; and a second light-emitting section having a second light source constituted by a second LED, and a second outer lens with which a light emission side of the second light source is covered and by which light emitted from said second light source is converged and radiated out.

Abstract: The invention is directed to provide a vehicle interior illumination device which has a high illuminating effect and which can be used for various kinds of illumination in a vehicle. The illumination device disposed in a roof portion of the interior of a vehicle, including: a first light-emitting section having a first light source constituted by a plurality of first LEDs disposed at substantially regular spaces; and a second light-emitting section having a second light source constituted by a second LED, and a second outer lens with which a light emission side of the second light source is covered and by which light emitted from said second light source is converged and radiated out.

Abstract: In the illumination device of tho invention, an LED is oppose to a side surface of a flat light guide member. A light shield surface for shielding light from the LED and emitted toward the backside of the guide member in vicinity of the LED on the backside of the light guide member.

Abstract: An illuminating plate for a car has a light guide plate; a cover provided with at least one light transmitting window, and disposed on the light guide plate; and light reflecting layer formed on the rear surface of the light guide plate. The light reflecting layer is formed to cover an area where the light is projected onto the rear surface of the light guide plate through the corresponding light transmitting window, and the light reflecting layer being slightly larger than the area.

Abstract: Ribs for defining pixel cells are formed in the shape of a lattice, and sustain electrodes and scan electrodes are disposed near the ribs. The electrodes are spaced apart in each pixel cell, and the sustain electrode and the scan electrode are each cut away between pixel cells arranged in the row direction to provide each pixel cell with individually separated electrodes. In addition, between pixel cells adjacent to each other in the row direction, the sustain electrodes and the scan electrodes are connected to each other by means of a sustain-side bus electrode and a scan-side bus electrode, respectively. This makes it possible to provide a high luminous efficiency. Furthermore, each pixel cell is provided with a wide distance between the electrodes and thereby with a large effective opening portion. Thus, this provides only a small amount of reduction in intensity when the electrodes are spaced apart between the pixel cells arranged in the row direction in order to increase the luminous efficiency.

Abstract: An illuminating plate for a car has a light guide plate; a cover provided with at least one light transmitting window, and disposed on the light guide plate; and light reflecting layer formed on the rear surface of the light guide plate. The light reflecting layer is formed to cover an area where the light is projected onto the rear surface of the light guide plate through the corresponding light transmitting window, and the light reflecting layer being slightly larger than the area.

Abstract: The PDP is divided into a plurality of scan blocks. Immediately before a write discharge period of each scan block, a pre-discharge erasing period or a pre-discharge period and a pre-discharge erasing period is or are established. To minimize the period of time from the pre-discharge to the write discharge, the pre-discharge and the pre-discharge erasing are conducted for each of the scanning and sustaining electrode blocks or in a sequential manner. Furthermore, a first sustaining discharge period of a short time is disposed immediately after the write discharge period for each scan block and a second sustaining discharge period for all display cells is arranged after the write discharge of all scan blocks.

Abstract: In order to improve the yield of the electrode manufacture with a highly capacity, highly fine panel structure and obtain highly efficient light emission with high intensity, the invention proposes a method of driving an electric discharge display panel, which has a color pixel array of vertical stripes type, pluralities of parallel scan and sustained discharge electrodes provided alternately on the same insulating substrate as that with the color pixel array thereon and having a double side discharge electrode structure striding two adjacent panel columns, and a plurality of column electrodes extending perpendicular to and insulated from the scan electrodes and sustained discharge electrodes. Independent display for each pixel column and the same display for two pixel columns are caused by adopting simultaneous two pixel column writing in a write period and adopting a novel phase differences for sustained discharge waveform.

Abstract: The scan electrodes are divided into a plurality of groups. These scan electrode groups are divided into those of a scan period and those of a non-scan period in a writing discharge period. A compensation pulse is applied, without application of a scan base pulse, to the electrodes in the non-scan period. Thus it makes possible to suppress electromigration between scan and sustaining electrodes while securing light intensity of emission as in the prior art by using the same techniques as therein.

Abstract: A driver circuit for a plasma display panel has first, second, third, and fourth switches. The first switch is connected to the higher potential side of a sustaining pulse power supply and supplies a current to sustaining electrodes. The second switch is connected to the lower potential side of the sustaining pulse power supply and draws a current from the sustaining electrodes. The third switch is connected to the higher potential side of the sustaining pulse power supply and supplies a current to the scanning electrodes. The fourth switch is connected to the lower potential side of the sustaining pulse power supply and draws a current from the scanning electrodes.

Abstract: A capacitive load drive is provided, which can perform faster and more efficient operation than an energy recovery circuit for effectively reducing ineffective energy of pulses applied to a capacitive load. An energy recovery circuit is connected to a first electrode of the capacitive load, to which pulses are applied. The energy recovery circuit comprises a coil and a capacitor connected in series for energy recovery, and a first and a second voltage clamp switches connected to the other terminal of the series circuit of the coil and the capacitor, the first voltage clamp switch being connected to a high voltage side terminal of the DC power supply, the second voltage clamp switch being connected to a low voltage side terminal of the DC power supply.

Abstract: The PDP is divided into a plurality of scan blocks. Immediately before a write discharge period of each scan block, a pre-discharge erasing period or a pre-discharge period and a pre-discharge erasing period is or are established. To minimize the period of time from the pre-discharge to the write discharge, the pre-discharge and the pre-discharge erasing are conducted for each of the scanning and sustaining electrode blocks or in a sequential manner. Furthermore, a first sustaining discharge period of a short time is disposed immediately after the write discharge period for each scan block and a second sustaining discharge period for all display cells is arranged after the write discharge of all scan blocks.

Abstract: A vehicle display device such as a speed meter including indicators, many segments illuminated in two or more colors by plural LEDs and an indicator control circuit. The indicators dispose the segments so as to display a variable such as a car speed in a bar graph or in the form of a number. The indicator control circuit displays the variable by controlling the lighting of the LEDs and changes an emitted light color of indication based on a fixed color changing reference value in accordance with a value of the variable. The control circuit controls a duty ratio of a supply current or a current value in a predetermined set value range determined on the basis of the color changing reference value. Namely, brightness of the emitted light color before a color change is gradually decreased, while brightness of the emitted light color after the color change is gradually increased.

Abstract: A driver circuit applies data pulses to column electrodes of a display panel. The display panel includes a plurality of row electrodes formed in a plane in parallel to each other and a plurality of column electrodes formed to be isolated from the row electrodes, parallel to each other, and orthogonal to the row electrodes. To collect charge, a circuit to drive column electrodes is connected to charge collecting coils and capacitors. There is further employed an output circuit of an IC having a switch dedicated for charge collection.

Abstract: The PDP is divided into a plurality of scan blocks. Immediately before a write discharge period of each scan block, a pre-discharge erasing period or a pre-discharge period and a pre-discharge erasing period is or are established. To minimize the period of time from the pre-discharge to the write discharge, the pre-discharge and the pre-discharge erasing are conducted for each of the scanning and sustaining electrode blocks or in a sequential manner. Furthermore, a first sustaining discharge period of a short time is disposed immediately after the write discharge period for each scan block and a second sustaining discharge period for all display cells is arranged after the write discharge of all scan blocks.

Abstract: The plasma display panel driver circuit disclosed includes a panel inter-electrode capacitor, a charging/discharging circuit, and a voltage clamp circuit. The panel inter-electrode capacitor is provided between scanning and sustain electrodes of a panel. The charging/discharging circuit is connected in parallel with the panel inter-electrode capacitor and formed by a combination of a coil, FET switches and reverse current blocking diodes. The voltage clamp circuit includes four switches connected to terminals of the panel inter-electrode capacitor. The panel inter-electrode capacitor, together with a series circuit of the coil and the FET switches, forms a parallel resonance circuit. The panel inter-electrode capacitor 40 is repeatedly charged and discharged through the control of the switches with switch drive inputs. In the driving of a plasma display panel, ineffective power is reduced when charging and discharging the panel inter-electrode capacitor.