摘要:
A method for manufacturing an LD is disclosed. The LD has a striped structure including an optical active region. The striped structure is buried with resin, typically benzo-cyclo-butene (BCB). The method to form an opening in the BCB layer has tri-steps etching of the RIE. First step etches the BCB layer partially by a mixed gas of CF4 and O2, where CF4 has a first partial pressure, second step etches the photo-resist patterned on the top of the BCB layer by a mixed gas of CF4 and O2, where CF4 in this step has the second partial pressure less than the first partial pressure, and third step etches the BCB left in the first step by mixed gas of CF4 and O2, where CF4 in this step has the third partial pressure greater than the second partial pressure.
摘要:
An image registration server stores encryption keys of respective ones of a plurality of client terminals. Image data is encrypted by the image registration server using the encryption key corresponding to the client terminal to which the image data is applied. The encrypted image data is applied to the client terminal via a server. The client terminal has a decryption key stored within so that only a client terminal that is duly authorized can decrypt encrypted image data. Other client terminals that are not duly authorized cannot decode the image data. This makes it possible to prevent unlawful use of image data even if the image data has been intercepted.
摘要:
An image outputting system that can keep the printed image quality always in good condition by correcting printing color tone based on printing color correcting information received via a network. The image outputting system comprises: an image outputting apparatus including a flat-bed scanner for reading an image, printers for printing the image, a network interface or a modem connectable with external devices via a network, and a correcting device for correcting printing color tone based on printing color correcting information received via the network; and a network server connected to the network for sending the printing color correcting information to the image outputting apparatus via the network. Thus, the network server controls the printing unit based on status information acquired from the image outputting apparatus and always keep the printed image quality in good condition.
摘要:
A method for producing a semiconductor optical device includes the steps of forming a semiconductor region including a ridge structure on a substrate; forming an insulating film on the semiconductor region; forming a non-photosensitive resin region on the insulating film, forming a first mask that defines a scribe area; forming the scribe area by etching using the first mask; after removing the first mask, forming an insulating layer by etching the insulating film, forming an electrode on the ridge structure and the non-photosensitive resin region to produce a substrate product; forming a scribe line on a surface of the semiconductor region in the scribe area of the substrate product; and cutting the product along the scribe line to form a semiconductor laser bar.
摘要:
A method for producing a semiconductor optical device includes the steps of forming a semiconductor region including a ridge structure on a substrate; forming an insulating film on the semiconductor region; forming a non-photosensitive resin region on the insulating film, forming a first mask that defines a scribe area; forming the scribe area by etching using the first mask; after removing the first mask, forming an insulating layer by etching the insulating film, forming an electrode on the ridge structure and the non-photosensitive resin region to produce a substrate product; forming a scribe line on a surface of the semiconductor region in the scribe area of the substrate product; and cutting the product along the scribe line to form a semiconductor laser bar.
摘要:
An electrostatic protection circuit being an integrated circuit on a semiconductor substrate and including a first power supply terminal having a predetermined potential VDD, a second power supply terminal having a lower potential VSS than the predetermined potential, and an input/output terminal for a signal, the electrostatic protection circuit including: a first and second diodes having the respective cathode electrodes thereof connected in series at a first common connection point between the first power supply terminal and input/output terminal; a third and fourth diodes having the respective anode electrodes thereof connected in series at a second common connection point between the second power supply terminal and input/output terminal; a first discharge element, connected between the first and second common connection points, for discharging excessive static electricity; and a second discharge element, connected between the first and second power supply terminals, for discharging excessive static electricity.
摘要:
An electrostatic protection circuit being an integrated circuit on a semiconductor substrate and including a first power supply terminal having a predetermined potential VDD, a second power supply terminal having a lower potential VSS than the predetermined potential, and an input/output terminal for a signal, the electrostatic protection circuit including: a first and second diodes having the respective cathode electrodes thereof connected in series at a first common connection point between the first power supply terminal and input/output terminal; a third and fourth diodes having the respective anode electrodes thereof connected in series at a second common connection point between the second power supply terminal and input/output terminal; a first discharge element, connected between the first and second common connection points, for discharging excessive static electricity; and a second discharge element, connected between the first and second power supply terminals, for discharging excessive static electricity.
摘要:
A method for producing a semiconductor optical device includes the steps of growing a semiconductor stacked layer including an etch stop layer and a plurality of semiconductor layers on a major surface of a substrate; forming a mask layer on a top surface of the semiconductor stacked layer so that a tip portion of each of protrusions that protrude from the top surface among protrusions generated in the step of growing the semiconductor stacked layer is exposed; etching the protrusion by wet etching using the mask layer; after etching the protrusion by wet etching, removing the protrusion by dry etching; and removing the mask layer from the top surface, after removing the protrusion by dry etching.
摘要:
A method for manufacturing an LD is disclosed. The LD has a striped structure including an optical active region. The striped structure is buried with resin, typically benzo-cyclo-butene (BCB). The method to form an opening in the BCB layer has tri-steps etching of the RIE. First step etches the BCB layer partially by a mixed gas of CF4 and O2, where CF4 has a first partial pressure, second step etches the photo-resist patterned on the top of the BCB layer by a mixed gas of CF4 and O2, where CF4 in this step has the second partial pressure less than the first partial pressure, and third step etches the BCB left in the first step by mixed gas of CF4 and O2, where CF4 in this step has the third partial pressure greater than the second partial pressure.
摘要:
An electrostatic discharge protection circuit comprises an input terminal, an output terminal connected to the input terminal via a transmission line, and connected to a circuit to be protected, and a filter circuit disposed in the transmission line, wherein the filter circuit includes at least one inductor disposed in the transmission line between the input terminal and the output terminal, and connected in series when a plurality of inductors are arranged, and at least one electrostatic discharge protection device connected between the transmission line and a reference potential line, the filter circuit being symmetrically configured in terms of an equivalent circuit between the input terminal and the output terminal.