摘要:
A light emitting device with higher luminance than that of a conventional light emitting device is provided. According to the present invention, a light emitting device comprises owing three layers of: a first cladding layer made of a p-type mixed crystal compound semiconductor; a p-type active layer made of a p-type mixed crystal compound semiconductor which has the mixed crystal ratio required to emit the light having a predetermined wavelength; and a second cladding layer made of a mixed crystal compound semiconductor, the conductivity type of which is n throughout the second cladding layer or except the region in the vicinity of the heterojunction with the p-type active layer, wherein the p-type active layer is sandwiched by the first cladding layer and the second cladding layer, and forms the double hetrojunction structure with said both cladding layers, and is characterized in that: the second cladding layer is doped with an n-type impurity or impurities and a p-type impurity or impurities; the total concentration of a p-type impurity or impurities in the second cladding layer is in the range of 1.times.10.sup.17 cm.sup.-3 and more; and a pn junction is formed in the second cladding layer of a position within 1 .mu.m from the heterojunction with the p-type active layer.
摘要:
An irradiation light containing a light which wave length is not absorbed by the n-type clad layer, but is absorbed by the p-type active layer, is applied on the wafer for manufacturing light emitting elements with a double-hetero structure of a p-type clad layer, a p-type active layer and an n-type clad layer formed one after another on a semiconductor substrate. Defects are found by detecting the increased photoluminescent light due to generation of a conductivity-type inverted layer such as the n-type inverted layer. When the double-hetero structure is composed of a GaAlAs mixed crystal compound semiconductor, the irradiation light which contains a wavelength range of 600-650 nm is applied. When the defective area is an active layer deficient area, detection is conducted by using the reflection light from the surface of the semiconductor substrate.
摘要:
By providing a nitrogen-doped low carrier concentration layer 13 having both of a donor concentration and an acceptor concentration controlled below 1×1016/cm3 at a p-n junction portion between an n-type GaP layer 12 and a p-type GaP layer 14, the luminance of the GaP light emitting device can be improved by as much as 20 to 30% over the conventional one. Suppressing the donor concentration and the acceptor concentration in the low carrier concentration layer 13 below 1×1016/cm3 inevitably gives a carrier concentration, which is expressed as a difference between both concentrations, lower than 1×1016/cm3 accordingly. The emission efficiency upon injection of electrons or holes can be improved by suppressing the concentration of the donor which serves as non-emissive center below 1×1016/cm3 to thereby extend the carrier lifetime; and by concomitantly suppressing the carrier concentration at a level significantly lower than that in the adjacent layers 12 and 14.
摘要翻译:通过在n型GaP层12和p型GaP层14之间的pn结部分提供具有供体浓度和受主浓度两者的氮掺杂低载流子浓度层13,其控制在1×1016 / cm3以下, 的GaP发光器件可以比传统的发光器件提高多达20至30%。 抑制低载体浓度层13中的供体浓度和受体浓度低于1×10 16 / cm 3时,不可避免地会产生一个载流子浓度,其表示为两个浓度之间的差值,相应地低于1×10 16 / cm 3。 通过抑制作为不发光中心的供体的浓度低于1×10 16 / cm 3,可以提高注入电子或空穴的发射效率,从而延长载体寿命; 并且通过伴随地将载流子浓度抑制在显着低于相邻层12和14中的水平。
摘要:
Before stopper members (25) of a skew correcting mechanism (10) are evacuated from a sheet conveyor path, sheet conveyor roller pairs (8) rotate a set angle in a direction opposite to the sheet feeding direction such that a sheet is separated from the stopper members (25). The sheet conveyor roller pairs (8) are arranged so that at least one of the rollers of each pair is independently pressed against the other with a force corresponding to the type of the sheet.
摘要:
A printer having a validation paper feeding mechanism in which the validation paper feed is controlled by a single solenoid and only the validation paper feed can be effected even when a cut or continuous paper is set. A ratchet wheel and a validation roller are mounted on the rotatable shaft via a one-way clutch. The one-way clutch selectively transmits a torque of the rotatable shaft to the validation roller in the direction of the validation paper feed. The validation roller has an arcuate circumferential surface for feeding the validation paper and a chord flat surface for inserting the validation paper. The armature is angularly moved between a first position where it engages the positioning projection of the ratchet wheel for determining an initial position of the validation roller and a second position where it engages the pawls of the ratchet wheel for stopping the validation roller at a plurality of predetermined positions.
摘要:
A content transferring apparatus is disclosed which includes: a source ID list reception unit for receiving a source ID list from a content reproducing apparatus capable of reproducing contents furnished with source IDs included in the source ID list; a first extraction unit for extracting from either one or a plurality of transfer-destined contents a content furnished with a source ID included in the source ID list; and a content transmission unit for transmitting the content extracted by the first extraction unit to the content reproducing apparatus.
摘要:
There is provided a printer comprising: a fixed cutting edge; and a movable cutting edge that moves toward the fixed cutting edge over a predetermined cut moving range from a cut starting position to a cut ending position, thereby to cut paper in cooperation with the fixed cutting edge. In this printer, the fixed cutting edge can move between a fixed-cutting edge mount position at which it is possible to cut the paper in cooperation with the movable cutting edge and a fixed-cutting edge dismount position at which it is not possible to cut the paper in cooperation with the movable cutting edge. When the fixed cutting edge is at the fixed-cutting edge mount position, the movable cutting edge can move between a movable-cutting edge cut position, at which movement of the fixed cutting edge toward the fixed-cutting edge dismount position is not permitted, and a movable-cutting edge non-cut position, at which movement of the fixed cutting edge toward the fixed-cutting edge dismount position is permitted.
摘要:
A toothed belt and pin assembly for a printer in which the pin is engaged with a guide hole of a carriage for reciprocally driving the carriage during movement of the belt. The assembly has an endless belt having a pitch line, and a pin mounted on the belt with the axis of the pin coinciding with the pitch line of the belt.
摘要:
An information processing apparatus and method for enabling efficient content download and transfer processing operations are provided. In downloading content, a content identifier thereof is acquired, a particular piece of content subject to transfer to an external device is identified on the basis of the acquired content identifier, the identified content is retrieved from a data storage block, and the retrieved content is transferred to the external device or written to an information recording medium, so that the processing of content downloading, the processing of content transfer to an external device and content writing to an information recording medium such as CD can be executed as a sequence of processing operations, thereby providing significantly efficient content download and content transfer or content write processing operations.
摘要:
Disclosed herein is an information-processing apparatus including an event-log acquisition section acquiring an event log provided by a content reproduction apparatus capable of reproducing a content as an event log including at least information identifying the content and information indicating a reproduction start date/time and reproduction end date/time of the content, an event-log analysis section deriving a reproduction start date/time and reproduction end date/time of a content reproduced by the content reproduction apparatus from the event log, a playlist generation section generating a playlist, which is to serve as a set of pieces of information each used for identifying a content reproduced during a specific period of time, on the basis of the reproduction start date/time and reproduction end date/time of the content, and a playlist transfer section transmitting the playlist to the content reproduction apparatus.