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    • 6. 发明专利
    • PHOTODETECTOR AND SUM OF PRODUCTS OPERATING DEVICE USING THIS PHOTODETECTOR
    • JPH0593936A
    • 1993-04-16
    • JP25627591
    • 1991-10-03
    • MITSUBISHI ELECTRIC CORP
    • NITTA YOSHIKAZUOTA ATSUSHITAI SHUICHIHISAMA KAZUO
    • G02F3/00G06E1/00G06F15/18G06N3/067G06N99/00
    • PURPOSE:To allow an optical sum of products operation to be executed in parallel and to obtain a large-scale neural network by disposing a light emitting element which allows optical writing and photodetector which allows electrical writing in orthogonally intersecting directions. CONSTITUTION:This device consists of a pair of Schottky electrodes 11, 12 formed on a semiconductor 2. A voltage of a negative polarity for writing is impressed to the control electrode 11 and a photoirradiation region is irradiated with writing light 4 at the time of a writing operation. A current of a positive polarity flows to the output electrode 12 at this time. The photoirradiation region is irradiated with reading out light 5 without impressing the voltage to the control electrode 11 at the time of a reading out operation. The current of the polarity reverse from the polarity at the time of the writing flows to the output electrode 12 at this time. The number of the carriers generated at the time of the writing depends on the bias voltage and the intensity of the writing light 4 and the space charges by the trapped carriers depend on the number of the carriers generated at the time of the writing and, therefore, the intensity of the writing light 4 is stored as the analog data in the form of the space charge into an MSM photodetector.
    • 7. 发明专利
    • OPTICAL FIBER GYROSCOPE
    • JPH01207621A
    • 1989-08-21
    • JP3230988
    • 1988-02-15
    • MITSUBISHI ELECTRIC CORP
    • TAI SHUICHITAKAHASHI MASANOBUARANISHI TOSHIOHISAMA KAZUO
    • G01C19/64G01C19/72
    • PURPOSE:To eliminate drift due to reflected light and to improve the sensitivity and accuracy by imposing pulse modulation light beams incident on a ring resonator with two kinds of pulses. CONSTITUTION:Ultrasonic wave optical modulators (AOM) 12a and 12b impose pulse modulation on the light beams incident on the ring resonator 90 individually. The pulse generating means 19 which consists of a pulse generator 17 and pulse control parts 18a and 18b generates two kinds of pulses which have pulse width much longer than the time required for the light beams to travel in the ring resonator 90 plural times and pulse intervals >=3 times as large as the pulse width and are pi out of phase with each other. The AOM drivers 13a and 13b drive the AOMs 12a and 12b with the driving pulses corresponding to the kinds of pulses. Pulse modulation is imposed on the light beams incident on the ring resonator 90 with the two kinds of pulses, and consequently two light beams which are propagated in the ring resonator 90 in the clockwise and counterclockwise directions are not present at the same time and the influence of reflected light is eliminated, so that any drift due to the reflected light is eliminated.
    • 9. 发明专利
    • CANCELING DEVICE FOR POLARIZATION OF OPTICAL FIBER
    • JPS62223721A
    • 1987-10-01
    • JP6589186
    • 1986-03-26
    • MITSUBISHI ELECTRIC CORP
    • TAI SHUICHIARANISHI TOSHIOHISAMA KAZUO
    • G02B6/28G02B6/00G02B27/28
    • PURPOSE:To easily from a large optical path difference between linearly polarized light beams by separating two linearly polarized light beams intersecting with each other at right angles, transmitting the separated polarized light beams to respective optical fibers having different lengths respectively, polarizing them in prescribed directions, and then synthesizing respective polarized light beams. CONSTITUTION:A laser light beam radiated from a laser light source 2 is converted into the 1st an 2nd linearly polarized light beams by an optical fiber coupler 3A and then respective linearly polarized light beams are polarized by the 1st and 2nd optical fiber type polarizers 4A, 4B. Both the light beams having different transmission speeds respectively are synthesized by the 2nd optical fiber 3B as non-polarized light through the 1st and 2nd optical fibers 5A, 5B having different optical path lengths respectively. Since the same kind of the optical fibers are used without using optical fibers having different refractive indexes, a large optical path difference can be easily applied to respective linearly polarized light beams, so that light radiated from the light source with long interference enabled wavelength can be converted into non-polarized light by using short optical fibers.
    • 10. 发明专利
    • OPTICAL FIBER GYROSCOPE
    • JPS6244620A
    • 1987-02-26
    • JP18625685
    • 1985-08-22
    • MITSUBISHI ELECTRIC CORP
    • TAI SHUICHIHISAMA KAZUOARANISHI TOSHIO
    • H01S3/083G01C19/64G01C19/72
    • PURPOSE:To obtain a small-sized, high-sensitivity optical fiber gyroscope by using a polarization plane maintaining optical fiber for an optical fiber loop as a rotation detection part and using a normal single-mode optical fiber for other optical paths and optical parts. CONSTITUTION:Rays of light from a semiconductor laser 1 as a light source are passed through the single-mode optical fiber 2 and split into two by an optical fiber coupler 4a, and only one rays of light are incident on a polarizer 5. The rays light become linear beams of polarized light of single polarization, which is split into two by an optical fiber coupler 12 without changing in polarization state and those beams are made incident on the optical fiber loop 13 composed of the polarization maintaining optical fiber through connectors 14a and 14b coupled so that the optical axis of the polarization plane maintaining optical fiber constituting the optical fiber loop 13 is aligned with the optical wav of the beams of linear polarized light wave propagated in the optical fiber coupler 12. The rays of light being made incident on the optical fiber loop 13 clockwise and counterclockwise have a mutuallyh phase shift owing to the rotation of the system and are guided to a photodetector 8 through a polarizer 5, so that the intensity of the interference light is measured.