Abstract: There is provided an elevator control device that can recognize that a car is within a door openable range even when a landing device has failed. The elevator control device includes a control unit configured to, when the landing device of the elevator has failed, position the car within the door openable range based on a signal from another device that detects a position of the car of the elevator. With this configuration, even when the landing device has failed, it is possible to recognize that the car is within the door openable range based on the signal from the other device.

Abstract: A projector device of the present disclosure includes a luminous tube made of quartz glass, a concave reflecting mirror in which the luminous tube is disposed, and an optical unit for projecting an image by utilizing light emitted from the concave reflecting mirror. The luminous tube has a luminous part, in which at least mercury is enclosed inside and a pair of electrodes is disposed so as to face each other, and a pair of sealing parts extending from the luminous part in opposite directions to each other. The luminous tube is disposed so as to direct the pair of electrodes in a vertical direction. A region of the image projected from the optical unit is a horizontally long rectangle.

Abstract: A projection display device which outputs light that carries information including an arbitrary planar display image displayed in a prescribed display region and guides the light to a windshield of a vehicle so that the display image carried by the light reflected from a surface of the windshield or its vicinity is projected and visually recognized as a virtual image from a prescribed eye point. A first image forming plane and a second image forming plane are provided as image forming planes of the virtual image, the first image forming plane is disposed approximately parallel with a plane that is perpendicular to a line of sight that connects the eye point and the virtual image, and the second image forming plane is inclined with respect to the plane that is perpendicular to the line of sight that connects the eye point and the virtual image.

Abstract: A projection display device which outputs light that carries information including an arbitrary planar display image displayed in a prescribed display region and guides the light to a windshield of a vehicle so that the display image carried by the light reflected from a surface of the windshield or its vicinity is projected and visually recognized as a virtual image from a prescribed eye point. A first image forming plane and a second image forming plane are provided as image forming planes of the virtual image, the first image forming plane is disposed approximately parallel with a plane that is perpendicular to a line of sight that connects the eye point and the virtual image, and the second image forming plane is inclined with respect to the plane that is perpendicular to the line of sight that connects the eye point and the virtual image.

Abstract: A projector device of the present disclosure includes a luminous tube made of quartz glass, a concave reflecting mirror in which the luminous tube is disposed, and an optical unit for projecting an image by utilizing light emitted from the concave reflecting mirror. The luminous tube has a luminous part, in which at least mercury is enclosed inside and a pair of electrodes is disposed so as to face each other, and a pair of sealing parts extending from the luminous part in opposite directions to each other. The luminous tube is disposed so as to direct the pair of electrodes in a vertical direction. A region of the image projected from the optical unit is a horizontally long rectangle.

Abstract: A method is for calculating an optical noise index of a signal light extraction apparatus that extracts signal light in a polarization plane by inputting signal light and a sampling pulse, different from the signal light in polarization plane by a given angle, to a nonlinear optical medium, and by passing light output from the nonlinear optical medium through an orthogonal polarizer having a polarization plane orthogonal to that of the signal light. The method includes calculating an output optical noise of the signal light extraction apparatus using a parametric gain of the nonlinear optical medium, a power of a quantum noise of the light having passed through the orthogonal polarizer, and a ratio of a power of the signal light and a power of the signal light sampled by the sampling pulse; and calculating an optical noise index using the output optical noise.

Abstract: A high-pressure mercury lamp including electrode assemblies and a discharge vessel (23) that is composed of: a main tube part (15) having a discharge space (13) inside; and a sealing part (17) connected to the main tube part. The electrode assemblies extend into the discharge space from and are hermetically sealed with the sealing part such that their tips face each other in the discharge space. The discharge space (13) is filled with mercury as light-emitting material, rare gas such as xenon, and halogen gas for halogen cycle. An electrode assembly is composed of an electrode part (27a), a metal foil (29a), and an external lead. The base part of an electrode inside the discharge space is provided with a liquid collecting coil (43) for holding mercury that gathers around the base part during a cooling period while lighting is off.

Abstract: A method is for calculating an optical noise index of a signal light extraction apparatus that extracts a part of signal light by inputting signal light and a control optical pulse different from the signal light in polarization plane by a given angle to a nonlinear optical medium, and by making light output from the nonlinear optical medium pass through an orthogonal polarizer having a polarization plane orthogonal to that of the signal light. The method includes calculating an output optical noise of the signal light extraction apparatus using a ratio of a power of the signal light that is taken out by the control optical pulse, a parametric gain of the nonlinear optical medium, and a power of a quantum noise of the light having passed through the orthogonal polarizer; and calculating an optical noise index using the output optical noise.

Abstract: In an optical amplification characteristics simulation apparatus according to the present invention, using spectrums of a signal light input to an optical amplifier and a characteristic parameter for amplification medium, gain wavelength characteristics of the amplification medium are calculated. A calculating formula for the above has a parameter corresponding to a gain fluctuation portion due to a gain spectral hole burning (GSHB) phenomenon, and this parameter is defined by a function obtained by modeling a physical phenomenon in which a population inversion rate is reduced due to the GSHB, based on that electron occupation numbers in each Stark level on the end level side are increased. Then, based on the calculated gain wavelength characteristics, the output power of the signal light is obtained, to thereby perform the optical amplification characteristics simulation on the optical amplifier.

Abstract: A first polarization controller controls a polarization state of measured light. A second polarization controller controls a polarization state of an optical sampling pulse. The measured light and the optical sampling pulse having the polarization states controlled are input to an optical fiber. An optical signal output from the optical fiber is transmitted to a polarizer. A first control unit adjusts the first polarization controller based on the measured light output from the optical fiber and the measured light output from the polarizer. A second control unit adjusts the second polarization controller based on an optical sampling pulse output from the optical fiber. Waveform measurement is performed by using the output of the polarizer.

Abstract: Reflection means such as a mirror are provided on the output end of an optical fiber, and the input signal light and control light are returned to the optical fiber. Although the zero-dispersion wavelength of the optical fiber fluctuates in the longitudinal direction, if the length is relatively short, it is possible to manufacture a high yield of optical fibers, which monotonically changes the zero-dispersion wavelength. Therefore, a relatively short optical fiber with a monotonic zero-dispersion change can be used. Since the zero-dispersion change is monotonic and the optical fiber is short, the amount of change in the zero-dispersion wavelength is small and the bandwidth becomes broader when the control light is set at the position of the average zero-dispersion wavelength. Additionally, although the length of the optical fiber is short, the operating length is twice as long and thus the generation efficiency does not degrade.

Abstract: An optical parametric amplifier of the invention comprises a nonlinear amplification section to which a signal light and a pump light are injected via a coupler. The nonlinear amplification section is constructed by connecting in multiple stages a plurality of polarization retaining highly nonlinear optical fibers (HNLFs) having mutually different zero-dispersion wavelengths and dispersion slopes. The zero-dispersion wavelengths of the HNLFs are on the short wavelength side of a pump light wavelength, and are shorter towards the output side HNLF. Furthermore, the arrangement is set such that the dispersion slopes of the HNLFs become steeper towards the output side HNLF. As a result, it is possible to realize an optical parametric amplifier that is high gain and broadband.

Abstract: A display apparatus for a vehicle includes display screen having a plurality of display areas such as a tachometer display area, a speedometer display area, and an auxiliary display area. The display apparatus for a vehicle further includes a CPU for controlling images displayed on the display screen. A display partition member is mounted on a part of the display screen.

Abstract: In an optical amplification characteristics simulation apparatus according to the present invention, using spectrums of a signal light input to an optical amplifier and a characteristic parameter for amplification medium, gain wavelength characteristics of the amplification medium are calculated. A calculating formula for the above has a parameter corresponding to a gain fluctuation portion due to a gain spectral hole burning (GSHB) phenomenon, and this parameter is defined by a function obtained by modeling a physical phenomenon in which a population inversion rate is reduced due to the GSHB, based on that electron occupation numbers in each Stark level on the end level side are increased. Then, based on the calculated gain wavelength characteristics, the output power of the signal light is obtained, to thereby perform the optical amplification characteristics simulation on the optical amplifier.

Abstract: Reflection means such as a mirror are provided on the output end of an optical fiber, and the input signal light and control light are returned to the optical fiber. Although the zero-dispersion wavelength of the optical fiber fluctuates in the longitudinal direction, if the length is relatively short, it is possible to manufacture a high yield of optical fibers, which monotonically changes the zero-dispersion wavelength. Therefore, a relatively short optical fiber with a monotonic zero-dispersion change can be used. Since the zero-dispersion change is monotonic and the optical fiber is short, the amount of change in the zero-dispersion wavelength is small and the bandwidth becomes broader when the control light is set at the position of the average zero-dispersion wavelength. Additionally, although the length of the optical fiber is short, the operating length is twice as long and thus the generation efficiency does not degrade.

Abstract: A first polarization controller controls a polarization state of measured light. A second polarization controller controls a polarization state of an optical sampling pulse. The measured light and the optical sampling pulse having the polarization states controlled are input to an optical fiber. An optical signal output from the optical fiber is transmitted to a polarizer. A first control unit adjusts the first polarization controller based on the measured light output from the optical fiber and the measured light output from the polarizer. A second control unit adjusts the second polarization controller based on an optical sampling pulse output from the optical fiber. Waveform measurement is performed by using the output of the polarizer.

Abstract: An optical parametric amplifier of the invention comprises a nonlinear amplification section to which a signal light and a pump light are injected via a coupler. The nonlinear amplification section is constructed by connecting in multiple stages a plurality of polarization retaining highly nonlinear optical fibers (HNLFs) having mutually different zero-dispersion wavelengths and dispersion slopes. The zero-dispersion wavelengths of the HNLFs are on the short wavelength side of a pump light wavelength, and are shorter towards the output side HNLF. Furthermore, the arrangement is set such that the dispersion slopes of the HNLFs become steeper towards the output side HNLF. As a result, it is possible to realize an optical parametric amplifier that is high gain and broadband.

Abstract: The vehicle-mounted display unit includes a display having a meter area and an auxiliary indication area. The meter area indicates a dial image for showing measured values of an operational condition of a motor vehicle. The auxiliary indication area indicates information other than the measured values. The display unit has a control device for controlling contents indicated on the display. The control device indicates a normal length pointer extended in the auxiliary indication area at a normal indication state, while the control device indicates a shorter length pointer in the auxiliary indication area when the other information is indicated.

Abstract: A display apparatus for a vehicle includes display screen having a plurality of display areas such as a tachometer display area, a speedometer display area, and an auxiliary display area. The display apparatus for a vehicle further includes a CPU for controlling images displayed on the display screen. A display partition member is mounted on a part of the display screen.

Abstract: When a detected lamp voltage (Vla) is below a predetermined value (S101: No), an alternating current that is higher in frequency than an alternating current supplied under rated-power operation is supplied (S102) for a predetermined time period (S103). The rated power is 150 W and the higher frequency is 500 Hz.