摘要:
[Objective] To prevent change in a direction of an optical axis of a split light within a plane parallel to a surface on which the beam splitter is installed.[Means] A laser module including a laser light source that emits a laser light and a beam splitter that splits a portion of the laser light emitted from the laser light source. The beam splitter includes a first reflective surface and a second reflective surface that are parallel to each other. The first reflective surface transmits a first portion of the laser light and reflects a second portion of the laser light to the second reflective surface. The second reflective surface receives the second portion of the laser light from the first reflective surface and reflects received laser light in a direction parallel to the laser light emitted from the laser light source.
摘要:
Proposed are a file storage apparatus and an access control method capable of facilitating the setting and change of an access right of a user for accessing a file.A first account which only authorizes referral of all files and a second account which authorizes referral and editing of all files are defined in advance as accounts in a file system, and if a workspace unit receives an access request from a client for accessing a file and the access right in the workspace of the user for accessing the target file of the access request and the access right in the file system are different, the workspace unit requests the file system unit to perform the access processing to the file upon switching the account of the user to the first or second account.
摘要:
Above a Peltier element disposed on a bottom of a case, bases that are platy members of two or more layers and have different expansion coefficients from each other are stacked. At least on a partial region of the base serving as an uppermost layer, a suppression member having an expansion coefficient different from that of the base serving as the uppermost layer is further provided. An optical element is disposed on the base and/or the suppression member. Even when a warp is likely to occur in the Peltier element, a stacked-plate structure of the base, the base, and the suppression member suppresses an occurrence of such a warp, whereby warps hardly occur in the base and the suppression member, and a shift hardly occurs in an optical axis between a beam splitter and an etalon.
摘要:
A microcontroller includes a program memory configured to store a program group and a first encryption key; a CPU; and an identification (ID) storage section configured to store an identification data peculiar to a user of the microcontroller. The CPU executes the program group to generate a second encryption key based on the identification data and the first encryption key and to encrypt a random number with the second encryption key.
摘要:
A semiconductor device has multiple power-supply through electrodes, grounding through electrodes, and signal-routing through electrodes made through a semiconductor chip. The power-supply through electrodes, the grounding through electrodes, and the signal-routing through electrodes differ mutually in cross-sectional area. Hence, a semiconductor device and a chip-stack semiconductor device are provided which are capable of preventing the electrodes' resistance from developing excessive voltage drop, heat, delay, and loss, and also from varying from one electrode to the other.
摘要:
A method and apparatus for inspecting a plurality of optical modules, in which the optical modules are given channel numbers, a plurality of inspection items, which are related to optical characteristics and/or electrical characteristics of the optical modules, are measured in parallel, and measurement data on the inspection items is stored in storing device. This makes it possible to inspect the optical modules efficiently in a short time, eliminating waiting time.
摘要:
An n-side electrode, an n-substrate, an n-buffer layer, a GRIN-SCH-MQW active layer, a p-spacer, a p-cladding layer, a p-contact layer, and a p-side electrode are laminated one on top another in that order. Above the n-buffer layer, the GRIN-SCH-MQW layer and the p-spacer layer occupy a narrower area than the n-substrate in a direction that is at right angles to the laser emission direction, wherein the remaining area is occupied by a p-blocking layer and an n-blocking layer. Within the p-spacer layer are embedded a first diffraction grating and a second diffraction grating. Between the first and the second diffraction grating and the p-side electrode is provided a current non-injection area.
摘要:
In the semiconductor laser device of the present invention, a semiconductor stacked structure including an active layer comprising a strained multi-quantum well structure is formed on a substrate 1, a cavity length is larger than 1000 &mgr;m but equal to or smaller than 1800 &mgr;m, and a low-reflection film S1 having a reflectance of 3% or less is formed on one facet and a high-reflection film S2 having a reflectance of 90% or more is formed on the other facet. The semiconductor laser module has a structure in which the semiconductor laser device is set to a cooling device constituted by electrically alternately arranging 40 pairs or more of the Peltier elements and holding them by top and bottom ceramic plates and sealed in the package. A grating having a reflection bandwidth of 1.5 nm or less is formed on an optical fiber to be built in.
摘要:
Herein disclosed is a method for preparing a nuclear-substituted salicylic acid or a metal salt thereof represented by the following general formula (1): ##STR1## [wherein R.sub.1 and R.sub.2 each represents a t-butyl group, a t-amyl group, a t-octyl group, an isononyl group or an isododecyl group, provided that at least one of R.sub.1 and R.sub.2 represents an isononyl group or an isododecyl group; M represents a hydrogen atom or a metal atom; and n is the atomic valency of the metal atom M] which comprises the step of subjecting, to a Kolbe-Schmitt reaction, an alkali metal salt of a nuclear-substituted phenol represented by the following general formula (2): ##STR2## [wherein R.sub.1 and R.sub.2 are the same as those defined above] in which 100 to 50% of the alkali metal salt is potassium salt and 0 to 50% thereof is sodium salt, in a substantially water-insoluble solvent as a reaction medium. The method makes it possible to improve the yield of the specific nuclear-substituted salicylic acid and metal salts thereof and to provide such products having high purity without any post-treatment. The compounds can be used in color developers for pressure-sensitive recording sheets without any additional purification treatment.