摘要:
A light beam splitting element that splits a beam incident on a beam receiving surface into a plurality of beams. The beam receiving surface has at least one predetermined area that directs a portion of the incident beam to proceed in a predetermined direction, the portion of the beam incident on the one predetermined area being insusceptible to spherical aberration. Further, the beam receiving surface has at least another predetermined area that directs another portion of the incident beam to proceed in another predetermined direction, the another portion of the beam incident on the another predetermined area being susceptible to spherical aberration.
摘要:
An image reading apparatus which reads a document image optically at a reading position while feeding the document over a reading glass. A document guide sheet for forming a step so as to prevent an imaged surface of a fed document from coming into contact with the reading glass is provided at an upstream side of the reading position with respect to a document feeding direction. The reading glass is capable of reciprocating in the document feeding direction by a specified distance x2. If the document guide sheet is located such that a downstream edge of the document guide sheet is at a distance x1 from the reading position, the distances x1 and x2 are in relationship of x1
摘要:
It is an object to provide an L-ascorbic acid derivative which can keep the L-ascorbic acid stable to heat and light and thus has a long shelf life, which is high in permeability into the skin, which can be quickly hydrolyzed by phosphatase, an enzyme that is ubiquitous in vivo, and which exhibits physiological activities that are inherent to L-ascorbic acid and beneficial to health, a method for producing such an L-ascorbic acid derivative, and a skin-whitening cosmetic material. There is provided an ascorbic acid derivative comprising an L-ascorbic acid-2-phosphate ester or a salt thereof wherein the phosphate ester has a branched alkyl group, the L-ascorbic acid-2-phosphate ester being of formula [13]. The ascorbic acid derivative is produced by a method comprising reacting a branched alkanol with phosphorus oxychloride to synthesize monoalkyldichlorophosphate or dialkylmonochlorophosphate, reacting the thus obtained substance with 5,6-O-isopropylidene-L-ascorbic acid obtained by reacting L-ascorbic acid with acetone, and subjecting the thus obtained substance to acid hydrolysis. There is also provided a cosmetic material containing such an ascorbic acid derivative by 0.05 to 80 percent by weight. (wherein each of R1 and R2 is a hydrogen (H) atom or an alkyl group having branches and including 3 to 30 carbon atoms, but not both of R1 and R2 are hydrogen (H) atoms)
摘要:
A heat exchanger comprises: a plurality of plate-shaped fins, which are laminated on each other at predetermined intervals, on which a plurality of insertion holes having burring portions are formed; and a plurality of tubes inserted into the insertion holes, wherein the burring portions and the tubes are brazed to each other, and at least the burring portions of the plate-shaped fins are composed of a plurality of metallic layers for displacing the burring portions to the side of the insertion holes according to a rise in temperature at the time of brazing.
摘要:
An image reading device capable of detecting foreign particles on a transparent member by including the transparent member, a conveyance unit that conveys an original document to the transparent member, a reading unit that reads via the transparent member an image of the original document being conveyed on the transparent member at multiple reading positions that exist with a prescribed distance therebetween along an original document conveyance direction, an output unit that outputs signals for different color components corresponding to each of the reading positions, a transparent member moving unit that moves the transparent member in a prescribed direction such that the original document slides over the transparent member while being conveyed to the reading positions during image reading, and a detector that detects noise components caused by foreign particles on the transparent member based on the output signals from the output unit.
摘要:
An optical disc apparatus includes a fixed portion having a light source portion and a movable portion that holds an objective lens and moves along a radial direction of an optical disc. The fixed portion includes the light source portion for selectively emitting short and long wavelength laser beams, and a collimator lens for collimating the laser beams. The objective lens includes a positive refractive lens and a diffractive lens structure formed on a surface of the refractive lens. The diffractive lens structure has wavelength dependence such that spherical aberration varies in the undercorrected direction as wavelength of incident light increases. The objective lens converges the short wavelength laser beam of a predetermined diffraction order onto an informatlon layer of a thin cover type optical disc, and converges the long wavelength laser beam of the identical diffraction order onto an information layer of a thick cover type optical disc.
摘要:
Disclosed is an optical system for an optical disk drive for reading/writing data from/in an optical disk. The optical system includes a light source emitting a parallel laser beam, a deflector having a rotatable mirror surface. The parallel laser beam emitted by the light source is incident on the mirror surface of the deflector and is deflected towards an objective lens system which faces the optical disk. A relay lens system is provided between the deflector and the objective lens system such that the mirror surface and a front principal plane of the objective lens system have a substantially conjugate relationship.
摘要:
To erase data stored in a flash memory at high speed with simple processing and to improve operation environment, a file stored in the flash memory is managed by small blocks smaller than a rewriting unit, and small blocks are linked to each other so that a file having a size of plural blocks can be constructed. When a file erase command is inputted, an ineffective code is written in an area indicative of effectiveness/ineffectiveness of each block which constructs the file subjected to erasing. Writing an ineffective code is easily realized, without erasing the flash memory, by changing at least one bit of the effective code from “1” to “0”. When the set time comes, blocks storing ineffective codes are organized.
摘要:
Disclosed is an optical disc drive for reading/writing data from/on an optical disc. The disc drive is provided with a laser source, an objective lens system, a deflection mirror between the laser source and the objective lens system. An incident angle of the laser beam incident on the objective lens system is changed by rotating the deflection mirror. Further, a relay lens system is provided between the deflection mirror and the objective lens system. A diffraction grating is provided between the laser source and the deflection mirror. The diffraction grating divides an incident beam into at least 0th order beam and ±1st order diffraction beams having predetermined diffraction angles. Further provided is a detecting system that receives the ±1st order diffraction beams deflected by the deflection mirror and determines a rotational position of the deflection mirror in accordance with the received ±1st order diffraction beams.
摘要:
A recording and reproducing apparatus and method which prevents or managing a data loss caused by each of seek operations in recording/reproducing a time-series digital data set, to/from a disk recording media via a buffer. Beforerecording/reproducing, a check is made, by using a rate of data transfer with the outside, a data transfer rate in an access to a track where each of the selected sectors lies, and a seek time for each of changes in tracks, to see if the buffer will overflow/underflow during the period of recording/reproducing. If so, then an input/output data transfer rate is reduced before recording/reproducing to make the check. In case of recording, if there is at least a substitute for a sector which will cause the overflow, the sector is changed to a substitute.