摘要:
In a signal detection circuit for an optical disk, a comparator converts an analog HF signal into a digital HF signal by using a slice level. A dropout detection circuit detects a dropout of the digital HF signal. A charge-pump circuit feeds back a slice-level control voltage to the comparator based on a result of the detection by the dropout detection circuit. A voltage follower holds and outputs a voltage stored in the capacitor. A switch is turned OFF when a dropout signal has been detected, and outputs to the voltage follower the voltage that has been stored in the capacitor during an ON state of the switch. A second switch is turned ON when a dropout signal has been detected, and applies an output of the voltage follower to the comparator.
摘要:
The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least −0.50% but not greater than −0.02%. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective cross-sectional area Aeff of at least 70 &mgr;m2 at the wavelength of 1.55 &mgr;m.
摘要:
The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least −0.50% but not greater than −0.02%. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective cross-sectional area Aeff of at least 70 &mgr;m2 at the wavelength of 1.55 &mgr;m.
摘要:
A security system, including a cable having a groove formed in the inside thereof to accommodate therein an optical fiber with an excessive length, a plurality of supports having mandrels to support the optical cable so as to provide a fence, a light transmitter to inject light into one end of the optical cable and a light receiver to detect the light projecting out of the other end of the optical cable so that any transmission loss through the optical cable due to an intrusion of the fence may be measured. The cable is formed so that when tension is applied to the optical cable, a transmission loss is detected. The resulting system has a threshold capability which distinguishes valid from false intrusions.
摘要:
A motor cooling structure for cooling a motor, which includes a shaft transmitting power and a rotor core attached to an outside of the shaft, by a cooling medium, includes: a cooling medium supply passage that extends to an inside of the shaft in an axial direction of the shaft and passes the cooling medium through the cooling medium supply passage; and a plurality of cooling medium passages that are branched from the cooling medium supply passage to cool the rotor core while flowing the cooling medium without branching the cooling medium in the axial direction and then eject the cooling medium from a plurality of ejection holes opened to a surface of the rotor core, wherein distances from a cooling medium inlet, through which the cooling medium flows into the cooling medium supply passage, to the respective ejection holes are equal between the plurality of cooling medium passages.
摘要:
A thermoplastic resin composition for blow molding is disclosed, which comprises a styrene based resin composition (A) containing a graft copolymer (A-1) containing an α,β-unsaturated glycidyl ester compound, a graft copolymer (A-2) not containing an α,β-unsaturated glycidyl ester compound and a copolymer (A-3), and an antistatic agent (B). According to the thermoplastic resin composition for blow molding of the present invention, blow molded articles are provided, which are excellent not only in surface property, impact resistance and heat resistance, but also in effects of suppressing adhesion of polished powder generated in a sanding process and dust during storage until the coating process, and further, the thermoplastic resin composition for blow molding which is reduced in adhesion property to a metal and is excellent in resistance to drawdown, and blow molded articles therefrom are provided.
摘要:
The present invention provides a resin composition for coating which is capable of exhibiting an excellent balance between coatability, impact resistance, moldability and chemical resistance, and capable of attaining a good coating appearance, for example, even when a large-size molded product is coated. The resin composition for coating according to the present invention comprises 84.9 to 98.9 parts by mass of the below-mentioned rubber-reinforced vinyl-based resin [A], 1 to 8 parts by mass of a polyester resin [B] and 0.1 to 7.1 parts by mass of a copolymer [C] of ethylene, a (meth)acrylic acid ester and carbon monoxide (with the proviso that a total amount of the components [A], [B] and [C] ([A] +[B] +[C]) is 100 parts by mass): [Rubber-reinforced vinyl-based resin [A]]A rubber-reinforced vinyl-based resin comprising a rubber-reinforced copolymer resin [A1] obtained by polymerizing a vinyl-based monomer [b1] in the presence of a rubber polymer [a], or comprising the rubber-reinforced copolymer resin [A1] obtained by polymerizing the vinyl-based monomer [b1] in the presence of the rubber polymer [a], and a (co)polymer [A2] of a vinyl-based monomer [b2].
摘要:
An image forming apparatus capable of reprinting image data once printed without requiring a server system for integrally managing image data is provided. A storage section individually provided in an image forming apparatus stores inputted image data, and an information generating section generates log information of the image data to record on an IC card outside the apparatus. Then, based on position information included in the log information, a data reading section specifies a storage section in which desired image data is stored among storage sections provided in a plurality of image forming apparatuses capable of implementing data communication, and reads the desired image data from the specified storage section.
摘要:
A heat-resistant microporous film and a battery separator are provided, which each include a substrate formed by using a porous film and include a heat-resistant layer formed on at least one surface of the substrate so as to contain a heat-resistant resin and heat-resistant particles, and in which a protrusion is formed on a surface of the heat-resistant layer in number not exceeding 60 per surface area of 0.0418 mm2 and has an area not exceeding 500 μm2 per surface area of 0.0418 mm2 in a direction normal to a surface of the heat-resistant layer, the protrusion being formed as a result of aggregation of the heat-resistant particles and having a height of at least twice the average particle size of the heat-resistant particles with reference to the height average surface of the heat-resistant layer.
摘要:
A VoIP gateway apparatus is used to provide an IP centrex service to accommodated devices. The VoIP gateway apparatus (1) assigns, to a call originated from an accommodated device (PBX 2), a telephone number for which the number of simultaneous call connections has not reached a simultaneous connection tolerance number, and sends the call to an IP centrex network (5) with the assigned telephone number used as a calling number. The VoIP gateway apparatus (1) includes a number-of-calls management part (105) and a SIP processing part (104). The number-of-calls management part (105) manages the number of the current simultaneous call connections for each of the telephone numbers as assigned to the apparatus. When a call is received from an accommodated device, a SIP processing part (104) selects, among the telephone numbers as assigned to the apparatus, a telephone number, for which the number of the current simultaneous call connections as managed by the number-of-calls management part (105) is smaller than the predetermined simultaneous connection tolerance number, and then transmits, to the IP centrex network (5), a SIP packet of a call control message to which the selected telephone number has been added as the calling number.