The Furukawa Electric Co., Ltd.

Fdk Corporation

Toshio Shibata

Hidekazu Kojima

Hideki Watanabe

Tomohiro Akiyama

Kenji Hamada

Eiji Nagashima

The switching power supply is provided with a voltage converter including a switching element for inputting a voltage from an input terminal, and has a spread spectrum function of varying a switching frequency in the switching element within a predetermined variation range. The switching power supply has a frequency setting unit that sets the variation range of the switching frequency and raises a lower limit value of the set variation range when a value of the voltage input from the input terminal is equal to or more than a predetermined threshold, and a signal generator that generates a control signal for driving the switching element by varying the switching frequency within the variation range set by the frequency setting unit.

Switching power supply with controlled switching frequency variation range

A DC/DC converterof the present invention is provided with a constant-voltage power supply circuit; a SENSE+ terminal; a SENSE&#x2212;/OCPSEL terminal pulled up to a predetermined voltage VL through a pull-up resistor R; and a controllerfor controlling the constant-voltage power supply circuit, wherein the controllercontrols the output voltage Vout of the constant-voltage power supply circuiton the basis of a potential difference between the SENSE+ terminal and the SENSE&#x2212;/OCPSEL terminal, on the condition that the voltage of the SENSE&#x2212;/OCPSEL terminal is lower than a threshold voltage, and sets predetermined control parameters on the basis of the voltage of the SENSE&#x2212;/OCPSEL terminal, on the condition that the voltage of the SENSE&#x2212;/OCPSEL terminal is equal to or higher than the threshold voltage.

Power supply

A mold is provided in which a molding portion, formed between joint surfaces of upper and lower molds superimposed one upon the other, is filled with UV curable resin after arranging a coating formation portion of an optical fiber in the molding portion, the coating formation portion is coated with the UV curable resin when the resin is cured by irradiating light thereto from outside, and a shading plate is arranged in the periphery of the molding portion. In a case equipped with the mold, there is provided a mirror or a lens for reflecting UV light to UV curable resin.

Molding die for covering optical fiber and optical fiber cover forming device

An optical fiber coating forming device forms a coating of an ultraviolet light hardening type in an optical fiber by precisely controlling an ultraviolet light output of a light source. The optical fiber coating forming device has a light source ( ) for irradiating ultraviolet light to resin for coating formation molded to a coating removing portion ( ) of an optical fiber core wire ( ), a light receiver ( ) for detecting intensity of the ultraviolet light by receiving the ultraviolet light irradiated to the resin for coating formation from the light source ( ), and an environmental sensor ( ) for detecting environmental information. The environmental sensor ( ) includes at least a temperature sensor ( ) and selectively includes a humidity sensor ( ) and an atmospheric pressure sensor ( ). An optical output controller ( ) feedback-controls the optical output of the light source ( ) on the basis of the environmental information detected by the environmental sensor ( ), the ultraviolet light intensity detected by the light receiver ( ), and control data for controlling the optical output of the light source ( ) based on the ultraviolet light intensity and the above environmental information.

Coating forming device of optical fiber

An optical fiber coating device that recoats a coating removed portion of an optical fiber with light-curing resin has an observation window through which a mold inside of a shielding lid that covers the mold can be confirmed in a state where the shielding lid remains closed. There is provided an open/close lid that can open/close the observation window. An optical shielding guard plate is provided around the observation window. A filter that cuts off the external light having a specific wavelength is provided on the observation window. There is provided a photo sensor that can detect the amount of light of a light source that irradiates a light onto the light-curing resin, and the amount of light can be automatically adjusted on the basis of the detected result of the photo sensor. An alarm that urges to exchange the light source is raised on the basis of the detected result of the photo sensor. There is provided a TV camera that can capture the interior of the mold and other portions to be observed. There is provided a mirror that projects a portion that cannot be directly observed among the portions to be observed.

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Tokyo, Japan

Toshio Shibata