Abstract: Provided is a tag communication device performing wireless communication with an RFID tag including a light emitting unit. The tag communication device includes a communication unit, an imaging unit, and a control unit. The control unit (i) acquires tag IDs of one or more RFID tags present in a communicable range of the communication unit, (ii) transmits a light emission instruction to at least some of the RFID tags corresponding to the acquired tag IDs, (iii) measures a distance between the imaging unit and a position where the light emitting unit emits light based on the light emission instruction on the basis of imaging information of the imaging unit, and (iv) performs a predetermined operation on the RFID tag to which the light emission instruction is transmitted, in a case where it is determined that the distance is within a predetermined range.

Abstract: A tag communication device performing radio communication with an RFID tag includes a light emitting unit. The tag communication device includes a communication unit, an imaging unit, and a control unit. The control unit (i) acquires a tag ID of RFID tags present in the communicable range of the communication unit, (ii) transmits a light emission instruction to some of RFID tags corresponding to the acquired tag ID, (iii) determines presence/absence of light emission of the light emitting unit based on the light emission instruction within an imaging area of the imaging unit on the basis of a result of imaging acquired by the imaging unit, and (iv) performs a predetermined operation for an RFID tag to which the light emission instruction has been transmitted in a case in which it is determined that light emission of the light emitting unit based on the light emission instruction is present.

Abstract: A tag communication device performing radio communication with an RFID tag includes a light emitting unit. The tag communication device includes a communication unit, an imaging unit, and a control unit. The control unit (i) acquires a tag ID of RFID tags present in the communicable range of the communication unit, (ii) transmits a light emission instruction to some of RFID tags corresponding to the acquired tag ID, (iii) determines presence/absence of light emission of the light emitting unit based on the light emission instruction within an imaging area of the imaging unit on the basis of a result of imaging acquired by the imaging unit, and (iv) performs a predetermined operation for an RFID tag to which the light emission instruction has been transmitted in a case in which it is determined that light emission of the light emitting unit based on the light emission instruction is present.

Abstract: Provided is a tag communication device performing wireless communication with an RFID tag including a light emitting unit. The tag communication device includes a communication unit, an imaging unit, and a control unit. The control unit (i) acquires tag IDs of one or more RFID tags present in a communicable range of the communication unit, (ii) transmits a light emission instruction to at least some of the RFID tags corresponding to the acquired tag IDs, (iii) measures a distance between the imaging unit and a position where the light emitting unit emits light based on the light emission instruction on the basis of imaging information of the imaging unit, and (iv) performs a predetermined operation on the RFID tag to which the light emission instruction is transmitted, in a case where it is determined that the distance is within a predetermined range.

Abstract: One aspect of the present invention provides an RFID reader/writer and a diagnosis processing program for outputting correct diagnostic information on communication between the RFID reader/writer and an RF tag. The RFID reader/writer includes a communication unit configured to conduct communication with the RF tag and a communication diagnostic unit configured to diagnose the communication when the communication is successfully conducted. The communication diagnostic unit includes a characteristic acquisition unit configured to acquire a characteristic of the communication from a communication signal with the RF tag, a comparator configured to compare a value indicated by the acquired characteristic to a threshold used to determine a communication margin, and an output control unit configured to cause an output unit to output information on the communication margin from a comparison result.

Abstract: The invention provides an image display processing device and an image display processing program for displaying information concerning diagnosis of correspondence with an RF tag. The image display processing device includes a unit for obtaining diagnostic information concerning correspondence when correspondence between the RF tag and an RFID reader/writer has been successful, and a display controller configured to make a display unit display an image based on the diagnostic information. The diagnostic information includes correspondence margin based on a characteristic value obtained from the correspondence signal.

Abstract: One aspect of the present invention provides an RFID reader/writer and a diagnosis processing program for outputting correct diagnostic information on communication between the RFID reader/writer and an RF tag. The RFID reader/writer includes a communication unit configured to conduct communication with the RF tag and a communication diagnostic unit configured to diagnose the communication when the communication is successfully conducted. The communication diagnostic unit includes a characteristic acquisition unit configured to acquire a characteristic of the communication from a communication signal with the RF tag, a comparator configured to compare a value indicated by the acquired characteristic to a threshold used to determine a communication margin, and an output control unit configured to cause an output unit to output information on the communication margin from a comparison result.

Abstract: The invention provides an image display processing device and an image display processing program for displaying information concerning diagnosis of correspondence with an RF tag. The image display processing device includes a unit for obtaining diagnostic information concerning correspondence when correspondence between the RF tag and an RFID reader/writer has been successful, and a display controller configured to make a display unit display an image based on the diagnostic information. The diagnostic information includes correspondence margin based on a characteristic value obtained from the correspondence signal.

Abstract: An antenna is disposed near a route of mobile object. A fixed tag is disposed at a location where a radio wave can be received from the antenna. When receiving a read command from the antenna, a mobile tag attached to the mobile object and the fixed tag send back a response signal at prescribed timing. A signal received from the fixed tag by the antenna is substantially constant. The signal from the fixed tag cannot be read while buried in a signal transmitted from the mobile tag to the antenna while the mobile tag is positioned at a location where communication with the antenna is expected. Conversely, when the mobile tag is at least a prescribed distance away from the antenna, the signal from the mobile tag cannot be read while buried in the signal from the fixed tag.

Abstract: A communication processing apparatus alternately transmits a carrier wave carrying a command and receives a response from a tag while transmitting an unmodulated carrier wave. A transmission control unit changes the phase of the unmodulated carrier wave transmitted from a transmission/reception circuit in response to start of reception of the reflected wave from the tag. The transmission/reception circuit includes a circuit for separating and detecting an I signal and a Q signal included in the reflected wave from the tag. A phase detection unit uses the I signal and the Q signal to detect change of the phase of the reflected wave. A distance calculation unit measures a time from a change of the phase of the unmodulated carrier wave to a detection of a corresponding change in the phase of the reflected wave, and uses the time to calculate the distance from the antenna to the tag.

Abstract: A radio frequency signal oscillator and an intermediate frequency signal oscillator are incorporated in a communication processing device, and a carrier wave with which an intermediate frequency signal is overlapped is generated using the oscillators and transmitted from an antenna. Mixers separate and extract an I signal and a Q signal from the intermediate frequency signal in the signal received by the antenna. A phase difference detector detects a phase difference of the intermediate frequency signal in a reflected wave to the intermediate frequency signal in the carrier wave using the I signal and the Q signal after the reception of the reflected wave from a tag is started. A distance calculator calculates a distance from the antenna to the tag using the phase difference and a wavelength of the intermediate frequency signal.

Abstract: Two antennas and an IC chip that independently operates the antennas are provided in a package of an RFID tag. Communication ranges A and B expanding in different directions when viewed from a front surface of the package are set by adjusting a directive characteristic of radio wave from each of the antennas. A reader/writer communicating with the tag selects one of the communication ranges A and B, and transmits a command including the identification information on the selected communication range. A control circuit in the IC chip executes the command on the condition that identification information included in the received command is matched with the antenna receiving the command, and returns response information through an antenna unit that receives the command.

Abstract: A radio frequency signal oscillator and an intermediate frequency signal oscillator are incorporated in a communication processing device, and a carrier wave with which an intermediate frequency signal is overlapped is generated using the oscillators and transmitted from an antenna. Mixers separate and extract an I signal and a Q signal from the intermediate frequency signal in the signal received by the antenna. A phase difference detector detects a phase difference of the intermediate frequency signal in a reflected wave to the intermediate frequency signal in the carrier wave using the I signal and the Q signal after the reception of the reflected wave from a tag is started. A distance calculator calculates a distance from the antenna to the tag using the phase difference and a wavelength of the intermediate frequency signal.

Abstract: A communication processing apparatus alternately transmits a carrier wave carrying a command and receives a response from a tag while transmitting an unmodulated carrier wave. A transmission control unit changes the phase of the unmodulated carrier wave transmitted from a transmission/reception circuit in response to start of reception of the reflected wave from the tag. The transmission/reception circuit includes a circuit for separating and detecting an I signal and a Q signal included in the reflected wave from the tag. A phase detection unit uses the I signal and the Q signal to detect change of the phase of the reflected wave. A distance calculation unit measures a time from a change of the phase of the unmodulated carrier wave to a detection of a corresponding change in the phase of the reflected wave, and uses the time to calculate the distance from the antenna to the tag.

Abstract: An antenna is disposed near a route of mobile object. A fixed tag is disposed at a location where a radio wave can be received from the antenna. When receiving a read command from the antenna, a mobile tag attached to the mobile object and the fixed tag send back a response signal at prescribed timing. A signal received from the fixed tag by the antenna is substantially constant. The signal from the fixed tag cannot be read while buried in a signal transmitted from the mobile tag to the antenna while the mobile tag is positioned at a location where communication with the antenna is expected. Conversely, when the mobile tag is at least a prescribed distance away from the antenna, the signal from the mobile tag cannot be read while buried in the signal from the fixed tag.

Abstract: An aldehyde derivative represented by the general formula (2) is reacted with ketene in the presence of a Lewis acid catalyst to produce a novel 2-oxetanone derivative (1), which is then purified to a 2-oxetanone derivative having a high trans-isomer purity, and then converted to a vinyl derivative (3) through decarboxylation reaction.

Abstract: A liquid crystal (LC) compound having generally required physical properties, low viscosity, proper optical anisotropy, proper dielectric anisotropy and good compatibility with other LC compounds is described. An LC composition including the compound and an LCD device including the composition are also described. The compound is expressed by formula (1a): wherein the ring A1 and the ring A2 are independently 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl or naphthalene-2,6-diyl, in which any hydrogen can be replaced by halogen; Z1, Z2 and Z3 are independently a single bond, —(CH2)2—, —(CH2)4—, —CH?CH—, —C?C—, —CF2O—, —OCF2—, —COO— or —OCO—; Xa, Xb, Xc, Xd, Xe and Xf are independently hydrogen or fluorine; Y is —OCH2F, —OCHF2, —OCF3, —SCH2F, —SCHF2, —SCF3, —CH2F, —CHF2, —CF3, fluorine or chlorine; La and Lb are independently hydrogen or fluorine; and “l” and “m” are independently equal to 0 or 1.

Abstract: An aldehyde derivative represented by the general formula (2) is reacted with ketene in the presence of a Lewis acid catalyst to produce a novel 2-oxetanone derivative (1), which is then purified to a 2-oxetanone derivative having a high trans-isomer purity, and then converted to a vinyl derivative (3) through decarboxylation reaction.

Abstract: A liquid crystal (LC) compound having generally required physical properties, low viscosity, proper optical anisotropy, proper dielectric anisotropy and good compatibility with other LC compounds is described. An LC composition including the compound and an LCD device including the composition are also described. The compound is expressed by formula (1a): wherein the ring A1 and the ring A2 are independently 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl or naphthalene-2,6-diyl, in which any hydrogen can be replaced by halogen; Z1, Z2 and Z3 are independently a single bond, —(CH2 )2—, —(CH2 )4—, —CH?CH—, —C?C—, —CF2O—, —OCF2—, —COO— or —OCO—; Xa, Xb, Xc, Xd, Xe and Xf are independently hydrogen or fluorine; Y is —OCH2F, —OCHF2, —OCF3, —SCH2F, —SCHF2, —SCF3, —CH2F, —CHF2, —CF3, fluorine or chlorine; La and Lb are independently hydrogen or fluorine; and “l” and “m” are independently equal to 0 or 1.

Abstract: A compound represented by the following formula (1), a composition comprising the composition and an element comprising the composition: Ra is alkyl having 1 to 15 carbons and so forth; A1, A2 and A3 are 1,4-cyclohexylene and so forth; Z1, Z2 and Z3 are a single bond and so forth; n and m are 0 or 1; and phenyl having (F)p is phenyl, 2-fluorophenyl and so forth.