摘要:
An optical pickup device in which a hologram element has a plurality of different diffraction directions. In the tracking standard state, the hologram element is divided into six areas by a straight line connecting two strength center points of two light beams, and by two straight lines that are perpendicular to the straight line. By adding the amount of light received by an area demarcated by two straight lines that pass the two strength center points, to the amount of light received by one of two outer areas sandwiching the area depending on the type of the light beam, it is possible to obtain a well-balanced tracking error signal for each of the two light beams.
摘要:
An optical pickup device in which a hologram element has a plurality of different diffraction directions. In the tracking standard state, the hologram element is divided into six areas by a straight line connecting two strength center points of two light beams, and by two straight lines that are perpendicular to the straight line. By adding the amount of light received by an area demarcated by two straight lines that pass the two strength center points, to the amount of light received by one of two outer areas sandwiching the area depending on the type of the light beam, it is possible to obtain a well-balanced tracking error signal for each of the two light beams.
摘要:
An optical pickup includes a hologram element divided into four regions in a direction parallel to a tracking direction of an optical information recording medium and a direction perpendicular thereto. The hologram element allows two pairs of diffracted lights from two paired regions adjacent in parallel with the tracking direction to be made incident into light receiving elements so as to align in the direction perpendicular to the tracking direction.
摘要:
An optical pickup includes: two laser diodes respectively operable to emit optical beams having different wave lengths; a diffraction grating operable to diffract each optical beam to a zero order diffracted beam and plus and minus first order diffracted beams; a holographic optical element operable to diffract the beams reflected from a recording medium; and photoelectric devices operable to receive the beams diffracted by the holographic optical element, wherein a photoelectric device for generating a tracking error signal and a photoelectric device for generating a focus error signal are disposed on opposite sides with respect to the laser diodes so as to face each other.
摘要:
This light-emitting device includes a first electrode, a second electrode disposed opposite to the first electrode and a phosphor layer which is sandwiched between the first electrode and the second electrode and constituted by dispersing n-type semiconductor particles in a p-type semiconductor medium. A light-emitting device in another embodiment includes a first electrode, a second electrode disposed opposite to the first electrode and a phosphor layer which is sandwiched between the first electrode and the second electrode wherein a p-type semiconductor is segregated among the n-type semiconductor particles.
摘要:
A light emitting device includes a pair of electrodes facing to each other and a phosphor layer which is sandwiched between the pair of electrodes and includes phosphor particles placed therein. The phosphor particles include an n-type nitride semiconductor part and a p-type nitride semiconductor part, the n-type nitride semiconductor part and the p-type nitride semiconductor part are made of respective single crystals having wurtzite-type crystal structures having c axes parallel with each other, and the phosphor particles include an insulation layer provided to overlie one end surface out of their end surfaces perpendicular to the c axes.
摘要:
There is provided a display device: a display unit including a plurality of scan electrodes arranged to extend in parallel to each other along a first direction, a plurality of data electrodes arranged to extend in parallel to each other along a second direction crossing the scan electrodes, and a plurality of pixels, each pixel at which a pair of the scan electrode and the data electrode cross each other, each pixel having a light emitting layer and a dielectric layer interposed between the scan electrode and the data electrode from a direction vertical to a face; and an erasing pulse supplying unit operable to supply attenuation voltage pulse, to the light emitting layer of each pixel, which starts at a voltage not more than an emission starting voltage at which the light emitting layer starts emission and in which polarity is alternately reversed between positive and negative.
摘要:
A light emitting device is provided with: a pair of an anode and a cathode that are opposed to each other; and a phosphor layer, composed of a plurality of phosphor particles, that is sandwiched between the paired anode and cathode, from direction that is perpendicular to main surfaces of the anode and the cathode, and in this structure, each phosphor particle is a nitride semiconductor phosphor particle having a wurtzite crystal structure that contains an n-type nitride semiconductor portion and a p-type nitride semiconductor portion, with the n-type nitride semiconductor portion being made in contact with the cathode and the p-type nitride semiconductor portion being made in contact with the anode, and the n-type nitride semiconductor portion and the p-type nitride semiconductor portion have the common c-axe in the respective crystal structures thereof made in parallel with each other, with the n-type nitride semiconductor portion and the p-type nitride semiconductor portion being made in contact with each other on a plane in parallel with the c-axe.
摘要:
Disclosed herein is a light-emitting device comprising a transparent or semi-transparent first substrate, a second substrate provided opposite to the first substrate, a transparent or semi-transparent first electrode provided on the first substrate, a second electrode provided on the second substrate so as to be opposite to the first electrode, and a light-emitting layer which contains a metal oxide semiconductor porous body, by the surface of which an organic light-emitting material is supported, and is provided between the first electrode and the second electrode.
摘要:
A display device is provided with a pair of a first electrode and a second electrode at least one of which is transparent or translucent and a phosphor layer formed so as to be sandwiched between the first electrode and the second electrode, and the phosphor layer has a polycrystal structure made of a first semiconductor substance in which a second semiconductor substance different from the first semiconductor substance is segregated on a grain boundary of the polycrystal structure, and the phosphor layer has a plurality of pixel regions that are selectively allowed to emit light in a predetermined range thereof and non-pixel regions that divide at least one portion of the pixel regions.