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    • 81. 发明专利
    • ALIGNING DEVICE
    • JPH0295203A
    • 1990-04-06
    • JP24814188
    • 1988-09-30
    • MATSUSHITA ELECTRIC IND CO LTD
    • YAMAMOTO MASAKISATO TAKEOAOKI SHINICHIROYAMAGUCHI KATSUMASANOMURA NOBORU
    • G01B11/00H01L21/027
    • PURPOSE:To decrease the cost of a rough aligning table by providing a vernier type reference diffraction grating, 1st and 2nd vernier type diffraction gratings, a lens with positive power, and a split type photodetector. CONSTITUTION:Coherent light beam from a laser 4 is split by the two different- pitch diffraction gratings of the vernier type reference diffraction grating 6. The two split diffracted light beams are converged by the illumination lens 9 to generate diffracted light beams by two different-pitch close diffraction gratings of the 1st and 2nd vernier type diffraction gratings 7 and 8 provided to a mask 1 and a wafer 2. Then the diffracted light beams are converged on the split type photodetector 12 through an image forming lens 10 to obtain a signal corresponding to the position shift between the wafer 1 and wafer 2 and the measurement range of the position shift between the both is expanded with a difference in the period of the signal. Consequently, the mechanical accuracy requirements for the rough aligning table for aligning the mask 1 and wafer 2 within the position shift measurement range can be reduced and the cost of the rough aligning table is reduced.
    • 85. 发明专利
    • SURFACE ACOUSTIC WAVE ACTUATOR
    • JP2002199750A
    • 2002-07-12
    • JP2000394296
    • 2000-12-26
    • MATSUSHITA ELECTRIC IND CO LTD
    • ASAI KATSUHIKOAOKI SHINICHIROYAMAMOTO MASAKISHIMIZU NORITOMO
    • H02N2/00
    • PROBLEM TO BE SOLVED: To provide a surface acoustic wave actuator which can drive a rotor without restrictions regarding the size of surface acoustic wave transfer portion. SOLUTION: In the surface acoustic wave actuator obtained, a surface acoustic wave transfer portion provided to a rotor includes a means for attaining selective contact of two or more output extracting members; the output extracting members, provided with the surface acoustic transfer portion at the front surface, are projected in contact with the surface acoustic wave transfer portion to generate a drive force via a friction force, causing a rotor to make relative movement with respect to the fixed portion; the output extracting members, having reached the end portion of the surface acoustic wave transfer portion depending on the relative movement of the rotor are isolated from the surface acoustic wave transfer portion; and the output extracting members, provided with the surface acoustic wave transfer portion at the front surface are projected, so as to be brought in contact with the surface acoustic wave transfer portion. Thereby, the rotor may be driven in the range where an output extracting member is made to be in contact with the surface acoustic wave transfer portion, and the rotor can be driven without restrictions regarding the size of the surface acoustic wave transfer portion.
    • 89. 发明专利
    • ALIGNMENT DETECTOR
    • JPH0547632A
    • 1993-02-26
    • JP20086591
    • 1991-08-09
    • MATSUSHITA ELECTRIC IND CO LTD
    • IWAZAWA TOSHIYUKISATO TAKEOYAMAMOTO MASAKI
    • G03F9/00H01L21/027H01L21/30
    • PURPOSE:To detect an alignment with high reliability and accuracy by eliminating instability of a vibration mirror due to extraneous vibration, concerning an alignment detector to be used in a reduction projection aligner or other device. CONSTITUTION:Let the repetition rate of an excimer laser oscillator 1 be Fa, and the frequency at which the orignal pattern can be reproduced when sampling is carried out at Fa be f (f is smaller than 1/10 of Fa). A vibration mirror 13 is driven at the frequency Fm=Fa+f or Fm=Fa-f. A differential frequency signal generator 22 and a phase shifter 23 are installed, and a signal whose frequency is the difference between Fa and Fm (¦Fa-Fm¦) is generated by the differential frequency signal generator 22. The phase of the signal is shifted by the phase shifter 23 so that the signal may be synchronous with an output signal of a low-pass filter 27. After that, the phase-shifted frequency signal is inputted into a phase detector 28. By this method, an alignment detector with high reliability and accuracy can be provided.
    • 90. 发明专利
    • ALIGNMENT UNIT
    • JPH0430413A
    • 1992-02-03
    • JP13591890
    • 1990-05-25
    • MATSUSHITA ELECTRIC IND CO LTD
    • YAMAMOTO MASAKITAKEUCHI HIROYUKISUGIYAMA YOSHIYUKIAOKI SHINICHIROSATO TAKEO
    • G01B11/00F02B75/02G03F9/00H01L21/027H01L21/30
    • PURPOSE:To make it possible to conduct a highly precise alignment even when an exposing operation is being performed by a method wherein a two-cycle coherent, having the wavelength different from exposure wavelength, is interfered on an object, and an optical beat signal is detected by the light-detecting device, located outside the exposure light flux, from the reflection light of the alignment mark in the exposure light flux of a second object. CONSTITUTION:An interference fringe of an arbitrary pitch is formed by allowing a two-cycle alignment light, having the wavelength different from an exposure light, to interfere with each other on the alignment mark 5 of the reticle of a first object, this interference fringe is color-corrected by a correction optical system 18, and it is projected on the wafer 2 of a second object through the intermediary of a projection lens 4. The reflected light, coming from a two-dimensional diffraction grating mark 6 for alignment on the object 2, is received by the light detector of the optical system 18 after a speckle pattern has been removed by a spacial filtering optical system. An alignment can be conducted by controlling the relative position of the reticle 1 and the wafer 2 by the positional deviation signal obtained from the comparison of position of the detected optical beat signal. As the interception of the exposure light can be prevented by projecting an alignment light on the correction optical system arranged outside the above-mentioned exposure light flux, an alignment operation can be conducted in a highly precise manner even using an alignment light having the wavelength different from the wavelength of the exposure light or even when an exposing operation is being conducted.