摘要:
An image forming apparatus has: a recording head having plural unit recording heads divided in a direction orthogonal to a moving direction of a recording medium; a detecting section detecting at least offset of an image recorded by a vicinity of an end portion, in the direction orthogonal to the moving direction of the recording medium, of the plural unit recording heads; and a correcting section correcting recording offset of the recording head on the basis of results of detection of the detecting section.
摘要:
A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 μm. The distance B1 between the laser stripe (42A) and the n-type electrode (52B) is no larger than 150 μm while the distance B2 between the laser stripe (42D) and the n-type electrode (52A) is no larger than 150 μm.
摘要:
To record AV data separately in a plurality of recording media, when a disk end detector detects that the free space in a disk runs out, a stream recording location controller accumulates AV data of a stream buffer in a stream shunt memory. When the disk is replaced with a new one, a disk recordability detector detects whether or not the new disk has become recordable. If recordable, a shunted stream write-back section transfers the AV data held in the stream shunt memory to the new disk.
摘要:
An image forming apparatus having a plurality of light sources and printing an image carrier by collectively scanning an image carrier with beams from the plurality of light sources includes a screen processing unit for performing a screen process on input image data and a registration correction processing unit for performing skew correction on the image data on which the screen process has been performed and for performing an image shift process in the sub-scanning direction, which is a moving direction of the image carrier, based on a periodic characteristic of exposure by the collective scanning and the period of the screen by the screen process.
摘要:
When a semiconductor light emitting device or a semiconductor device is manufactured by growing nitride III-V compound semiconductor layers, which will form a light emitting device structure or a device structure, on a nitride III-V compound semiconductor substrate composed of a first region in form of a crystal having a first average dislocation density and a plurality of second regions having a second average dislocation density higher than the first average dislocation density and periodically aligned in the first region, device regions are defined on the nitride III-V compound semiconductor substrate such that the device regions do not substantially include second regions, emission regions or active regions of devices finally obtained do not include second regions.
摘要:
A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 μm. The distance B1 between the laser stripe (42A) and the n-type electrode (52B) is no larger than 150 μM while the distance B2 between the laser stripe (42D) and the n-type electrode (52A) is no larger than 150 μm.
摘要:
When GaN or other nitride III-V compound semiconductor layers are grown on a substrate such as a sapphire substrate, thickness x of the substrate relative to thickness y of the nitride III-V compound semiconductor layers is controlled to satisfy 0
摘要:
Provided is a nitride semiconductor having a larger low-defective region on a surface thereof, a semiconductor device using the nitride semiconductor, a method of manufacturing a nitride semiconductor capable of easily reducing surface defects in a step of forming a layer through lateral growth, and a method of manufacturing a semiconductor device manufactured by the use of the nitride semiconductor. A seed crystal portion is formed into stripes on a substrate with a buffer layer sandwiched therebetween. Then, a crystal is grown from the seed crystal portion in two steps of growth conditions to form a nitride semiconductor layer. In a first step, a low temperature growth portion having a trapezoidal-shaped cross section in a layer thickness direction is formed at a growth temperature of 1030° C., and in a second step, lateral growth predominantly takes place at a growth temperature of 1070° C. Then, a high temperature growth potion is formed between the low temperature growth portions. Thereby, hillocks and lattice defects can be reduced in a region of the surface of the nitride semiconductor layer above the low temperature growth portion.
摘要:
The present invention relates to a cross flow type cooling tower with which it is possible to prevent emission of white vapor in cold weather. In order to accomplish the above object, the cooling tower of the present invention is constructed of heat exchange units each of which having plates arranged vertically and parallel from each other so as to form passages therebetween, which are separated into wet air passages and switchable air passages capable of switching from dry air passages and wet air passages; a water bath divided into upper and lower baths by a partition plate with holes, the upper bath is provided with spray nozzles for spraying water into the switchable passages, the lower bath provided with spray nozzles for spraying water into the wet passages. When the weather is warm, hot water is supplied into the upper bath, and both the upper and lower baths are filled with water and cooling is performed in every passage. However, when the weather is cold, then the water is supplied to the lower bath, and only the wet passages are used for heat dissipation and the switchable passages are uses to produce dry air to prevent generation of white vapor by mixing the dry air with the moist air.
摘要:
The present invention relates to a heat dissipation unit for cross flow type cooling tower with which it is possible to prevent the emission of white vapor without lowering the cooling power of the cooling tower, and also without requiring troublesome routine operation. In order to accomplish the above object, the heat dissipation unit of the present invention comprises filling plates arranged vertically and parallel with each other so as to form spaces therebetween, each of the filling plates having uneven surfaces down which water to be cooled flows when water to be cooled is supplied onto the filling plates, and cowl members disposed between neighboring filling plates, each of the cowl members including a pair of side plate portions having upper ends and a roof portion connecting the upper ends of the side plate portions. The side plate portions of the cowl members are arranged substantially parallel with the filling plates so as to form gaps between the filling plates and the side plate portions of the cowl members.