| NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY Patent applications |
| Patent application number | Title | Published |
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| 20120135780 | POWER CONTROL METHOD IN COGNITIVE RADIO COMMUNICATION, COGNITIVE RADIO COMMUNICATION SYSTEM, AND RADIO COMMUNICATION DEVICE - Provided is a power control method, etc., in cognitive radio communication, by which power control can be effectively performed without a large indirect cost. In the power control method, a target value of SNR is estimated on the basis of the control information relating to interference. Subsequently, communication power used for the cognitive radio communication is adjusted on the basis of the estimated target value of SNR. Thereby, power control can be effectively performed without a large indirect cost. | 05-31-2012 |
| 20120135770 | METHOD FOR ADJUSTING CHANNELS IN COGNITIVE WIRELESS COMMUNICATION, AND COGNITIVE WIRELESS COMMUNICATION SYSTEM CAPABLE OF IMPLEMENTING THE METHOD - There is disclosed a channel adjusting method capable of suppressing the occurrence of interference between a cognitive pilot channel (CPC) and an auxiliary control channel (ACS) in cognitive wireless communications. According to the channel adjusting method for use in cognitive wireless communications, initially, a connection using a cognitive pilot channel (CPC) is set up. Thereafter, it is determined whether or not a spectrum sensing channel (ACS) is to be utilized. If yes, it is then determined whether or not any interference occurs between the spectrum sensing channel (ACS) and the set-up cognitive pilot channel (CPC). This allows an adjustment to be performed such that no interference occurs between the cognitive pilot channel (CPC) and the spectrum sensing channel (ACS). | 05-31-2012 |
| 20120092766 | DISPLAY DEVICE - A display device is capable of freely setting a viewing location for a real image formed by an imaging optical system of real specular image. The display device includes: an object of view; the imaging optical system having a semitransparent substrate with a plane of symmetry to define an object side space in which the object exists and a viewer side space in which a viewer exists, where the imaging optical system forms a real image of the object of view in the viewer side space with light passing through the substrate; and a reflective mirror arranged in the viewer side space so as to reflect light beams supplied from the imaging optical system to guide the reflected light beams toward the viewer. | 04-19-2012 |
| 20110242644 | High-Speed Multiplied Signal Generating Method And Device - It is an object of the present invention to provide an apparatus that can obtain a multiplied harmonic signal fast and with ease, and the method using the apparatus. | 10-06-2011 |
| 20110235201 | TWO-IMAGE-POINT IMAGING OPTICAL DEVICE - A two-image-point imaging optical device forms a real image in space on the same side as a point light source with respect to one plane on the device and a virtual image in space on the opposite side. In the two-image-point imaging optical device, multiple dihedral corner reflectors each comprising two mutually perpendicular planar specular surfaces are so disposed that the line of intersection between the two specular surfaces of each dihedral corner reflector is parallel with those of the others on a first plane. A virtual image is formed in space on the side opposite to the point light source which the two specular surfaces face with respect to the first plane and a real image is formed in space on the same side as the point light source. This enables the virtual and the real images that lie on a straight line to be observed from a viewpoint in the space on the same side as the point light source. | 09-29-2011 |
| 20110211844 | OPTICAL SIGNAL PROCESSING CIRCUIT - An optical gate switch circuit includes: an asymmetric Mach-Zehnder interferometer having an optical path that outputs control light and probe light to a second optical directional coupler via a first optical directional coupler and an optical phase modulation element, and another optical path that connects a third optical directional coupler to which the probe light is input, to the second optical directional coupler via a variable optical attenuator and an optical phase shifter; and a bandpass filter connected to the second optical directional coupler. | 09-01-2011 |
| 20110170695 | TIME-BIN POLARIZATION FORMAT EXCHANGE TECHNIQUE FOR ENTANGLED OPTICAL SOURCE - It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. | 07-14-2011 |
| 20110164605 | WIRELESS COMMUNICATION SYSTEM - A wireless communication system includes a coordinator ( | 07-07-2011 |
| 20110103800 | RADIO-ON-FIBER UNIT AND RADIO-ON-FIBER SYSTEM - An object of the present invention is to provide a radio-on-fiber unit and a radio-on-fiber system which can transmit/receive signals at adequate rates especially, to/from a mobile device. A first aspect of the present invention relates to a radio-on-fiber unit ( | 05-05-2011 |
| 20110097029 | Super Flat Optical Frequency Comb Signal Generator - It is an object of the present invention to provide an optical frequency comb generator to generate an optical frequency comb with flat spectral properties using a single modulator. The optical frequency comb generator comprises: a drive signal system ( | 04-28-2011 |
| 20110065380 | RADIO NODE APPARATUS, MULTI-HOP RADIO SYSTEM, AND MULTI-HOP RADIO SYSTEM CONSTRUCTING METHOD - The present invention provides a radio node apparatus, a multi-hop radio system and a multi-hop radio system constructing method, capable of constructing a tree type multi-hop radio system in which mutual radio nodes determine a radio node which becomes a root node of a tree in an autonomous manner and the root node is set as a root in an autonomous manner. The radio node apparatus includes a storage unit for storing state information, used for constructing a multi-hop radio system, including information for specifying a root radio node apparatus positioned at a summit of the multi-hop radio system, with the radio node apparatus has a connection, and the number of hops from the root ratio node apparatus, a collection unit for collecting state information transmitted from surrounding radio node apparatus, and a selection unit for selecting a host connection-accepting radio node apparatus on the basis of the information for specifying the root radio node apparatus and the number of hops included in the collected state information. | 03-17-2011 |
| 20110043653 | ELECTROMAGNETIC FIELD HIGH SPEED IMAGING APPARATUS - An electromagnetic field high speed imaging apparatus, using an image sensing element having a filter function for each pixel, converts a local polarization state in detection light containing a difference frequency component Δf (|fLO−fRF|) between the modulation frequency fLO of irradiated light and the frequency fRF of the electromagnetic field emitted from a subject into local intensity of light, and captures it by an image sensor of an imaging unit to generate a two-dimensional image of distribution of the near electromagnetic field emitted from the subject. Each pixel of the image sensor comprises a photoelectric conversion element for converting the detection light from the optical unit into an electric charge, a plurality of charge storages, and a charge splitting part for dividing the electric charge generated in the photoelectric conversion element between the plurality of charge storages. | 02-24-2011 |
| 20110019199 | METHOD FOR EVALUATING CHARACTERISTICS OF OPTICAL MODULATOR HAVING HIGH-PRECISION MACH-ZEHNDER INTERFEROMETERS - Problem An object is to provide a method for evaluating characteristics of individual Mach-Zehnder (MZ) interferometers in an optical modulator which includes a plurality of MZ interferometers. | 01-27-2011 |
| 20100322073 | COMMUNICATION CONTROL APPARATUS, COMMUNICATION TERMINAL APPARATUS, WIRELESS COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - The amount of information reported by a communication terminal apparatus to a communication control apparatus is reduced based on the congestion status of communication. Communication control | 12-23-2010 |
| 20100310383 | ION PUMP SYSTEM AND ELECTROMAGNETIC FIELD GENERATOR - It is an object of the present invention to provide an ion pump system etc. having a high air-exhausting capacity and vacuum-maintaining capacity and capable of adjusting drive modes suitable for the uses thereof The subject problem is solved by an ion pump system ( | 12-09-2010 |
| 20100214394 | VOLUME SCANNING THREE-DIMENSIONAL FLOATING IMAGE DISPLAY DEVICE - A volume scanning three-dimensional floating image display is constructed from a real mirror image forming optical system capable of forming the real mirror image of an object to be projected in a planar symmetric position with respect to a symmetry surface, and a display located under the symmetry surface showing images that serve as the object to be projected, and an actuator means capable of moving the display in a direction with a component perpendicular to the display surface, so by changing the displayed image synchronously with the motion of the display, the real mirror image of that image will be formed in the space on the other side of the symmetry surface as a three-dimensional floating image. | 08-26-2010 |
| 20100208893 | APPARATUS AND METHOD FOR QUANTUM CRYPTOGRAPHY COMMUNICATION - A quantum cryptography communication apparatus performs quantum cryptography communication between a transmitter and a receiver. The quantum cryptography communication apparatus includes first communicating unit transmitting and receiving a communication signal including relatively strong pulse light between the transmitter and the receiver, and second communicating unit transmitting and receiving a relatively weak quantum cryptography signal between the transmitter and the receiver in a period in which the communication signal is off and the attitude axis for the receiver can be adjusted to that for the transmitter by the second communicating unit. | 08-19-2010 |
| 20100208742 | PACKET COMMUNICATION METHOD USING NODE IDENTIFIER AND LOCATOR - A home node and a destination node, which are specified by node identifiers, acquire locators thereof and mapping of the node identifiers and the locators, prior to communication, and they are transmitted after the address of a packet specified by the node identifier is rewritten by the locator at the time of communication. Because roles of the node identifier and the locator are separated, the communication method is suitable for mobile communication and multi-homing. In addition, the communication method makes it possible to reduce use amount of global addresses, and thus solve an address exhaustion problem. | 08-19-2010 |
| 20100202785 | QUADRATURE AMPLITUDE MODULATION SIGNAL GENERATING DEVICE - A quadrature amplitude modulation (QAM) signal generator, which can obtain optical signals such as QAM signals without handling multilevel electrical signals, can be produced by using a plurality of parallel Mach-Zehnder modulators (MZMs), such as quadruplex parallel MZMs (QPMZM). The quadrature amplitude modulation (QAM) signal generator includes a first waveguide, a first quadrature phase-shift-keying (QPSK) signal generator provided on the first waveguide, a second waveguide connected with the first waveguide at a wave-combining point, and a second quadrature phase-shift-keying (QPSK) signal generator provided on the second waveguide. | 08-12-2010 |
| 20100195055 | MULTI-VIEWPOINT FLOATING IMAGE DISPLAY DEVICE - A multi-viewpoint floating image display device enabling observation from multiple viewpoints by combining mirror images of objects to be projected and spatially separated from one another as real images in a small region in space. The display device comprises a multi-viewpoint floating image display optical system having real mirror imaging optical systems each of which forms a real image of each of the objects in a plane-symmetric position symmetric to the object with respect to one geometrical plane which is the symmetry plane. All the real mirror imaging optical systems are so arranged that the angle formed by given symmetry planes is less than 180 degrees on the real image side with respect to the symmetry planes. The objects are so arranged as to correspond to the respective real mirror imaging optical systems. | 08-05-2010 |
| 20100177402 | FLOATING IMAGE INTERACTION DEVICE AND ITS PROGRAM - A real mirror image forming optical system is constructed from a half-mirror, and from a retroreflector placed in a position where it recursively reflects either the light passing through or reflected by that half-mirror, so that light emitted from an object to be projected placed behind the half-mirror can pass through either a first light path consisting of passing through the half-mirror, recursive reflection by the retroreflector, and reflection by the half-mirror; or a second light path consisting of reflection by the half-mirror, recursive reflection by the retroreflector, and passing through the half-mirror; thus by one or both of these light paths a real mirror image of the object to be projected is formed at a planar symmetric position with respect to the half-mirror surface. | 07-15-2010 |
| 20100157179 | OPTICAL WAVEFORM SHAPING DEVICE - It is an object of the present invention to provide an optical waveform shaping device of high resolution. | 06-24-2010 |
| 20100150495 | OPTICAL SWITCH SYSTEM USING OPTICAL INTERFERENCE - It is an object of the present invention to provide an optical switch system using optical interference. An optical switch system ( | 06-17-2010 |
| 20100143159 | ION PUMP DEVICE - The above-mentioned problem is solved by an ion pump ( | 06-10-2010 |
| 20100141857 | OPTICAL WAVEFORM SHAPING DEVICE - It is an object of the present invention to provide an optical waveform shaping device of high resolution. | 06-10-2010 |
| 20100141442 | HOME NETWORK, AREA NETWORK USING THE SAME, PROGRAM FOR COMPUTER TO EXECUTE OPERATION IN HOME NETWORK, AND COMPUTER-READABLE RECORDING MEDIUM STORING THE PROGRAM - Slaves are respectively provided corresponding to electric devices, measure, in real time, power usage states and disposed positions of the electric devices to transmit to a master. The master detects operational states of electric devices on operation based on power usage states received from the slaves, and detects a positional relation between electric devices on operation based on disposed positions of the electric devices. Then, the master estimates the number of residents in the house by determining achievability of operational states of electric devices based on the detected operational states and positional relation of electric devices. | 06-10-2010 |
| 20100128271 | TRANSMISSION OPTICAL SYSTEM - A transmission optical system includes a plurality of imaging optical systems arranged apart from each other, forming successively the image of an object to be projected so a real image of either a two-dimensional or a three-dimensional object can be observed at the opposite end, with its convexity features either identical to or reversed from the projected object, depending on whether the total number of the imaging optical systems is even or odd. | 05-27-2010 |
| 20100110095 | ELECTRONIC DEVICE AND INFORMATION PROCESSING DEVICE - The present invention provides an electronic device and the like that can prevent the leakage of information related to a display image through an observation signal of an electromagnetic signal emitted from an electronic device or the like. The electronic device ( | 05-06-2010 |
| 20100098556 | Vacuum Conveyance System - It is an object of the present invention to provide a portable vacuum carrying system. | 04-22-2010 |
| 20100073751 | MULTIPLE-VIEWING-POINT FLOATING IMAGE DISPLAY DEVICE - A multiple viewing-point floating imaging device is comprised of a plurality of dihedral corner reflectors | 03-25-2010 |
| 20100053732 | High-Speed Multiplied Signal Generating Method And Device - It is an object of the present invention to provide an apparatus that can obtain a multiplied harmonic signal fast and with ease, and the method using the apparatus. | 03-04-2010 |
| 20100045422 | SENSOR NETWORK SYSTEM ENABLES HIGHLY-RELIABLE TRANSMISSION/RECEPTION OF CONTROL COMMAND AND EFFICIENT BAND - If control periods at sensors are equal to each other, a control terminal transmits control commands intended for the sensors at a time to the sensors at the earliest control timing and the latest control timing among control timings at the sensors. If the control periods are different from each other, the control terminal transmits control commands intended for the sensors at a time to the sensors at the start timing and the end timing of the shortest control period. Further, if reception periods in data reception from a sensor is longer than a control period at the sensor, the control terminal transmits a control command to the sensor in response to data reception from the sensor. | 02-25-2010 |
| 20100023468 | METHOD AND APPARATUS FOR CHEMICAL GENETIC PROGRAMMING - A chemical genetic programming apparatus is provided, which enables programming by the application of a chemical genetic algorithm. A CPU | 01-28-2010 |
| 20100021178 | Polarization direction synchronization detecting circuit and receiving apparatus - A switch is to be inputted a modulation signal including the synchronization signal extracted from a received communication signal as a control signal, is to be inputted a detection signal detected by a photodetector that receives a polarization modulation signal adjusted to a polarization direction of a quantum cipher signal, and selectively switches and outputs one of the detection signal and an inverted signal of the detection signal according to the control signal. A low-pass filter outputs the output signal of the switch, whereby a plus level signal is outputted when a relative angle difference Δθ between polarization axes on a transmission side and a reception side is larger than a predetermined polarization angle, a 0 level signal is outputted when Δθ is equal to the predetermined polarization angle, and a minus level signal is outputted when Δθ is in a range of the predetermined polarization angle from 0 degree. | 01-28-2010 |
| 20100014874 | PHASE CONTROL OPTICAL FSK MODULATOR - There is provided an optical modulator capable of controlling the phase of a USB signal and the phase of an LSB signal of an optical FSK modulated signal. A modulation signal is applied to a main Mach-Zehnder electrode (or an electrode C) ( | 01-21-2010 |
| 20100002319 | TWO-POINT IMAGE FORMATION OPTICAL DEVICE - A two-point imaging optical device utilizing an optical element that achieves a new type of imaging system, in which a two-point imaging optical element is provided with a plurality of mirrored surface portions arranged perpendicularly or at an angle close to perpendicular in a narrow interval between two parallel planes, which form an element plane, so as to be sandwiched between the two planes to form a flat panel shape, with the plurality of mirrored surface portions placed so as to be mutually isolated and parallel, or having an angle close to parallel between each mirrored surface portion, and an image of the subject of projection is formed in a space on the side of the element plane on which it has been placed, and another image of the subject of projection is formed in a space on the other side of the element plane. | 01-07-2010 |
| 20090310231 | OPTICAL SYSTEM - An optical system having a novel imaging method of forming an image of a subject of projection in space the same as if the image were being reflected from a mirror where a mirror does not actually exist is provided, the optical system being provided with a light beam redirecting surface that functions to transmit light while refracting the light and form a real image at a plane-symmetric position, and a mirror surface arranged facing the light beam redirecting surface; in which, by transmitting light emitted from the subject of projection through the light beam redirecting surface, reflecting the transmitted light at the mirror surface, and again transmitting the reflected light through the light beam redirecting surface, an image of a subject of projection arranged at a position on an observation side opposite the mirror surface arranged on the other side across the light beam redirecting surface is formed at a position that is plane-symmetric to the mirror surface with respect to the light beam redirecting surface to which a virtual mirror that does not exist as a substantial body has been moved. | 12-17-2009 |
| 20090304393 | SUPER HIGH SPEED OPTICAL FREQUENCY SWEEPING TECHNOLOGY - It is an object to provide an optical frequency control device or the like which can quickly carry out control over a wide frequency range. The object is achieved by an optical frequency control device or the like comprised of an optical SSB modulator ( | 12-10-2009 |
| 20090290148 | METHOD AND DEVICE FOR CALIBRATING A LIGHT INTENSITY MEASUREMENT DEVICE - It is an object of the present invention to provide a method and a device for automatically calibrating a light intensity measurement device. The device ( | 11-26-2009 |
| 20090274128 | WIRELESS NETWORK SYSTEM - A radio device, which is the source, transmits a route request packet (RREQ) to a radio device. In response to the route request packet (RREQ), the radio device transmits to the radio device a route setup packet (RSET) including a route Radio Device Radio Device Radio Device Radio Device by looking-up topology information (TPIF). In response to the route setup packet (RSET), the radio device produces a route notification packet (RNTF) and transmits the produced route notification packet (RNTF) to radio devices, and. In response to the route notification packet (RNTF), the radio device, which is the destination, produces a route reply packet (RREP) and transmits the produced route reply packet (RREP) to the radio device, which is the source. | 11-05-2009 |
| 20090231991 | TRANSMITTER APPARATUS, RECEIVER APPARATUS, TRANSMITTING METHOD, RECEIVING METHOD, AND PROGRAM - A serial-parallel converter | 09-17-2009 |
| 20090095883 | Photodetection device and method - The photo-detecting device includes a photodetector for detecting incident light, an input J FET for reading the sensing signal from the photodetector, an amplifier for amplifying the signal detected by the input J FET, a feed-back circuit for feeding the output of the amplifier back to the gate of the input J FET through a feed-back capacitor, a reset circuit for resetting the feed-back capacitor by discharging it with a reset MOS FET, and a circuit of a switch and resistor. The same level voltage as the gate voltage of the input J FET is applied to its source through a resistor, and the circuit of the switch and the resistor is connected between the source of the reset MOS FET and the feed-back capacitor. The reset MOS FET and switch are controlled so that the reset MOS FET is turned “on” and “off” while the switch is “on”. | 04-16-2009 |
| 20090092083 | MULTI-HOP WIRELESS NETWORK SYSTEM - A source terminal measures characteristics of the path at the source terminal itself, produces a characteristics-measurement packet, and transmits the produced characteristics-measurement packet to a relay terminal. Upon receiving the characteristics-measurement packet, the relay terminal measures characteristics of the path at the relay terminal itself, renews the characteristics of the path included in the characteristics-measurement packet using the measured characteristics of the path, and transmits the characteristics of the wireless communication path to the destination terminal. The source terminal produces an admission-request packet and transmits the packet to the destination terminal. Upon receiving the admission-request packet, the destination terminal allows or rejects the traffic quality maintenance request according to the characteristics of the wireless communication path. The allowance or rejection of the quality maintenance request is transmitted to the source terminal with the admission-reply packet by the destination terminal. | 04-09-2009 |
| 20090089046 | Word Use Difference Information Acquisition Program and Device - A device or computer implemented program for accurately and automatically obtaining general-purpose information regarding the usage difference between a plurality of synonyms and quasi-synonyms, such as the types of words with which the synonyms and quasi-synonyms are often used, is provided with: means for receiving the input of a plurality of words; means for extracting sentence data including an inputted word from a corpus; means for analyzing the sentence structure of the sentence data and extracting nouns that are in a grammatical relationship with the inputted word included in the sentence data; means for extracting the nodes representing the nouns and the nodes representing the semantic category of the noun from a thesaurus and forming a directional graph for each inputted word; means for comparing a plurality of directional graphs and extracting the difference nodes; and means for outputting the extracted difference nodes as information relating to the usage difference of the inputted words. | 04-02-2009 |
| 20090073417 | COHERENT DOPPLER LIDAR - A coherent Doppler lidar which can oscillate high energy pulses and output laser beams in a longer wavelength range of 1.5 μm to the atmosphere is provided. The coherent Doppler lidar has a pulse laser an oscillation wavelength of which is controlled by means of injection locking of a seed light output from a master laser, wherein the pulse laser is a type in which a laser medium is disposed in a resonator, a pulse light of a predetermined repetition frequency is input to the laser medium as an excitation light, whereby pulse laser oscillation is generated in the resonator to output pulse laser beams from the resonator, and the laser medium being a type which has at least a region having Tm, Ho:YAG ceramics, and is excited by the excitation light to output pulse laser beams in 2 μm wavelength band. | 03-19-2009 |
| 20090055773 | ITEM DISPLAY DEVICE, ITEM DISPLAY METHOD, AND COMPUTER-READABLE INFORMATION RECORDING MEDIUM HAVING PROGRAM RECORDED THEREON - An item display device displays numeric buttons on a screen using an ordinary format, but a numeric button that has been operated by a user is temporarily highlighted. When reverting to ordinary display after a fixed amount of time has elapsed, the device first displays all numeric buttons using an intermediate format, then highlights the operated numeric button, while displaying the other numeric buttons using the ordinary format. All numeric buttons are again displayed using the intermediate format, and then all numeric buttons are reverted to ordinary display. Moreover, a difference in the numeric button display colors between the ordinary display and the intermediate format is equal to a difference in the numeric button display colors between the highlighted display and the intermediate format. In so doing, snooping by detection of intensity differences in electromagnetic waves leaking from the screen display is prevented. | 02-26-2009 |
| 20090044639 | Sensor element, sensor device, object movement control device, object judgment device - A sensor element capable of appropriately detecting an external force operating three-dimensionally is provided. The sensor element includes an elastic member which can be compressed or expanded by an external force received from an object, a resistance element whose electric resistance value rises or falls when deformed by the external force, and a support member arranged inside or on the surface of the elastic member and capable of supporting the resistance element disposed at a predetermined position. The sensor element is applied to an object movement control device and an object judgment device. | 02-19-2009 |
| 20090031800 | Sensor Element, Sensor Device, Object Movement Control Device, Object Judgment Device - A sensor element capable of appropriately detecting an external force operating three-dimensionally is provided. The sensor element has an electrically conductive elastic member whose electrical property changes when compressed or expanded by an external force, and a plurality of electrode elements, which are capable of receiving power supply, for measuring electric properties from outside. The plurality of electrode elements are grouped into one or more sets, each having a predetermined number of electrode elements, for measuring electrical properties, and the electrode elements constituting a set are arranged three-dimensionally inside and on the surface of the conductive elastic member. | 02-05-2009 |
| 20080237469 | BOLOMETER-TYPE THz-WAVE DETECTOR - In a bolometer-type THz-wave detector in a micro-bridge structure in which a temperature detecting portion (diaphragm) including a bolometer thin film is supported by a supporting portion in a state suspended from a circuit substrate, a member (dielectric cover) made of a dielectric material for efficiently collecting a THz wave is added to an upper part of the temperature detecting portion, and when a refractive index of the dielectric cover is n, thickness is t, and a wavelength of the THz wave is λ, a setting is made so as to have nt>λ, and a gap between the dielectric cover and the temperature detecting portion is set at integral multiples of λ/2. By this arrangement, an absorption of the THz wave can be improved using a structure and manufacturing method of a bolometer-type infrared detector, and a high-performance bolometer-type THz-wave detector can be manufactured with a high yield. | 10-02-2008 |
| 20080237467 | BOLOMETER-TYPE THZ-WAVE DETECTOR - In a micro-bridge structure in which a temperature detecting portion (diaphragm) including a bolometer thin film is supported by a supporting portion in a state floated from a circuit substrate, a reflective film reflecting a THz wave is formed on the circuit substrate, an absorbing film absorbing the THz wave is formed on the temperature detecting portion, and an optical resonance structure is formed by the reflective film and temperature detecting portion. A gap between the reflective film and temperature detecting portion measures approximately ¼ infrared wavelength (e.g., 1.5 to 2.5 μm). Sheet resistance of the temperature detecting portion is set in a range in which an absorptance of the THz wave becomes a predetermined value or above on the basis of the THz wave (approximately 10-100 Ω/sq.). The absorptance of the THz wave is drastically improved while using the structure and manufacturing technique of a bolometer-type infrared detector. | 10-02-2008 |
| 20080212915 | Nested modulator - A nested modulator is provided where the circuit arrangement of modifying electrodes including signal electrodes is simplified, and at the same time, the drive voltage can be lowered. | 09-04-2008 |
