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`(cid:58)(cid:76)(cid:81)(cid:87)(cid:72)(cid:78) (cid:40)(cid:91)(cid:75)(cid:76)(cid:69)(cid:76)(cid:87) (cid:20)(cid:19)(cid:19)(cid:27)
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`1
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`Description
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`1. Title of the Invention
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`A tranSpanent type linger touch input device
`2. Claims
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`A transparent type finger touch input device comprising:
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`a plurality of straight first electrodes parallel
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`to each other, made of a
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`transparent conductive material provided on a display surface;
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`a plurality of straight second electrodes parallel to each other, made of a
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`transparent conductive material, crossing each first electrode, provided on said display
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`surface;
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`a transparent dielectric material for forming a predetermined electrostatic
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`capacity between the interposed and Opposed electrodes at at least each intersection
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`between the second electrodes and the first electrodes;
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`a transparent insulator material for covering each electrode from the surface
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`side;
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`a detection circuit for detecting a change of electrostatic capacity at each
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`intersection, as a coordinate position of the intersection.
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`3. Detailed Description of the Invention
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`[Field of industrial application]
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`The present application relates to an input device for providing an instruction
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`to input information by a touch of a finger tip to a predetermined coordinate position
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`on a display surface of a cathode ray tube (hereinafter referred to as CRT) display
`device or the like.
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`[Prior art]
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`The input device has been used in a CRT display device or the like attached to
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`each kind of data processor such as a computer, control device or
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`the like.
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`Conventionally, as disclosed in “A transparent type finger touch input device with a
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`coordinate detection surface superimposed on a display screen”, “Nikkei Electronics”,
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`Nikkei McGraw Hill Company, June 8, 1981, Pages 122-137, a means is generally
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`used for detecting a conduction by contact between perpendicularly crossing
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`electrodes by a touch of a finger tip, for which a set of electrodes using a transparent
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`conductive material, perpendicularly crossing to each other, is provided on the display
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`screen of the CRT, and a gap is provided between these opposing surfaces, or a means
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`is generally used for detecting a light shielding by a finger tip to determine a
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`coordinate position, for which a plurality of light beams are projected from sides
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`perpendicular to each other to the surface of the CRT and each light beam is received
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`at the side Opposing to this.
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`[Problem to be solved by the invention]
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`However, on the one hand in the former means, a transparent and conductive
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`material film which constitutes the set ofelectrodes may be poor in restoring force and
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`be in contact semi—permanently. 0n the other hand in the latter means, since the
`surface of the CRT curves and the light beam straightly advances, in a circumferential
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`part of the surface of the CRT a defect is caused, such as a distance between the
`surface of the CRT and the light beam becomes large, a difference between a position
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`touched by a finger tip carried out on the basis of a display on the CRT and a
`coordinate position detected by shielding a light beam becomes large, an error is
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`generated in detecting an information input position, or the like.
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`The object of the present invention is to radically solve the above conventional
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`problem, and to provide a transparent type linger touch input device which is reliable
`and extremely effective for not-generating an error in a manner to detect.
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`[Means for solving problem]
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`For this, the invention comprises the following means.
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`That is, a plurality of straight first electrodes parallel to each other, made ofa
`transparent conductive material, a plurality of second electrodes crossing these, which
`is similar to the first electrodes, and a transparent dielectric material for forming a
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`predetermined electrostatic capacity between the interposed and opposed electrodes at
`at least each intersection between the second electrodes and the first electrodes are
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`provided on a display surface, and the surface of each electrode is covered with a
`insulator material and a detection circuit for detecting a change of electrostatic
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`capacity at each intersection as a coordinate position of the intersection is provided.
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`[Operation]
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`Therefore, if a linger tip is brought close to an intersection of the electrodes,
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`electrostatic capacity at the intersection is changed by effect on a human body, this is
`detected as a coordinate position, and depending on this an input of information by a
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`touch ofa finger tip is performed.
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`[Example]
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`Here, the details of the present invention will be specifically described with
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`referent to the figures which show examples of the present invention.
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`Fig.
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`1 represents a disassembled oblique view, in which electrodes X", Xm]
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`made of film-like and straight transparent conductive material as a first electrode are
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`provided parallelly to each other and at a specified pitch Px, and similar electrodes Y.,,
`Y,,.,.. perpendicularly crossing these, as a second electrode, are provided at a specified
`pitch Py, a transparent film-like dielectric material 2 is interposed at at least these
`intersections, thereby a predetermined electrostatic capacity is formed between the
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`electrodes X“, Xn+| and the electrodes YD, YHH which oppose to each other.
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`A transparent film-like insulator material 3 is provided on a surface side of
`each electrode X“, Xnfl, Ym YnH, thereby each electrode X,,, X,,,.., Y“, Y,“ and the
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`dielectric material 2 are covered with this, and these are integrally stacked and then are
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`provided with a close contact with the display surface 1.
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`Fig. 2 represents a circuit diagram of a detection circuit. Electrodes Xowx.
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`are connected through a set of switches SWx to one input I] or the other input I; of a
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`differential amplifier DA individually or they are not connected. On the one hand the
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`electrodes Y0“Y5 are connected through a set of switches SWy to a common potential
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`or a high-frequency power source (hereinafter referred to as a power source) HFG, and
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`on the other hand a set of switches SWy and SWx are controlled by a control section
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`CONT such as a micro-processor or the like and each switch SYo-Sys of the set of
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`switches SWy is sequentially and repeatedly driven from a state which the common
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`potential is commonly selected to a state which the power source HFG is selected.
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`Each switch SxO-Sx4 of the set of switches SWx is normally in a neutral state.
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`However, for every cycle period which drives of the switches Syn—Sys take a round,
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`switches adjacent to each other are driven as a pair, and if ones of a succeeding order
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`select
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`the input 1;,
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`then ones of the next order select
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`the input 12, and this is
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`sequentially and repeatedly performed by every pair.
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`Therefore, during a period when the electrodes Yo-Y5 are sequentially
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`connected to the power source HFG, first, the electrode X0 is connected to the input I.
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`and the electrode X] is connected to the input 12, and during a next similar period the
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`electrode X] is connected to the input 11 and the electrode X2 is connected to the input
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`I2, thereafter sequentially, the electrodes X2 and X3, X3 and X4, X4 and X0 and again X0
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`and X] are individually connected to respective 11 and 12, and then a similar processing
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`is repeated.
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`On the other hand, since electrostatic capacities Coo-C45 (hereinafter referred to
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`as capacities) formed at intersections between the electrodes XU-X4 and the electrodes
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`Yg-Y5 are approximately the same value respectively, and for example when the
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`electrode Y0 is connected to the power source HFG and the electrode X0 is connected
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`to the input 11 and the electrode X] is connected to the input 12, the capacities C00 and
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`C10 are approximately the same, currents flowing through resistors R1, R2 inserted
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`between the input I], 12 and the common potential are approximately the same, these
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`terminal voltages are generated as approximately the same values, both the input
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`voltages are offset in a differential amplifier DA, and a detection output is not sent.
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`To this, If a finger tip is touched through the insulator material 3 to the
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`intersection between the electrode X0 and the electrode Y0,
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`the capacity C00 is
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`increased to C00 + AC, an current of ix1>ix2 flows from the power source I-IFG to the
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`electrodes X0, X. as shown in Fig. 3 regarding a detection condition, in accordance
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`with this, the terminal voltages of the resistors R1, R2 are in an unbalanced state, and
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`the difference between both the input voltages is sent as a detection output DO.
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`Then, since this is converted to DC by a detection circuit DET and provided to
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`the control section CONT, the control section CONT determines order of switches
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`selecting the input 11 and selecting the power source l-IFG depending on the signais
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`controlling the switches SWx, SWy, coordinate signals DSx, DSy indicating
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`coordinate positions which the detection is performed are sent and this is provided to a
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`data processing device (omitted on the figure), a coordinate position which an input
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`instruction ol‘inlbrmation is made by touching with a finger tip can be detected.
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`Therefore, ifa width W and pitches Px, Py of each electrode XU-X4, YU-YS are
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`determined depending on a detection accuracy of a coordinate position indicated by
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`each electrode Xn-X4, Yo—YS, a degree of effect of a human body, the frequency of the
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`power source HFG, a dielectric constant of the dielectric material or the like, a finger
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`tip touching coordinate position can be reliably detected with sufficient accuracy.
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`Since the electrodes are integrated,
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`that is reliable, and since the display
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`surface 1 curves but each electrode is film—like, it has a closed contact to the display
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`surface 1 and an error is not generated between a display by a CRT or the like and a
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`position detected by a touch of a finger tip.
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`In addition, ITO (Indium Tin Oxide) or the like may be used for each electrode
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`X0~X4, Yo-Ys, and various kinds of transparent dielectric materials may be used as a
`dielectric material 2.
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`However, as a display surface, not only a CRT but also each kind of display
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`device surface may be used. A case that electrodes X0-X4 and YO-Y5 are crossed with
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`a predetermined angle may be the same. Electrodes Xo-X4 and Yo-Y5 and a dielectric
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`material 2 may not be directly formed onto a display surface 1, and these may be
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`manufactured as a separate film (or films) to be applied to the surface. And also in
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`Fig. 3, the relationship between electrodes X0-X4 and Y0~Y5 may be opposite to the
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`above, and a control section CONT, a differential amplifier DA or the like may be
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`replaced with other identical one.
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`The respective numbers of electrodes Xo-X4 and YU-Ys may be determined
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`depending on the condition to be used. A dielectric material 2 may be interposed
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`over the whole surface between the electrodes instead of at only each intersection in a
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`similar way. Various kinds of modification including these may be freely applied.
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`[Ell’ect 0f the invention]
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`As is clear from the above description, according to the present invention,
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`since any mechanical displacement is not used and a capacity change by a finger tip is
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`detected, a noticeable effect as a finger touch input means which can be reliable, can
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`not cause an error on a detection coordinate position, and can use various kinds of
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`display devices is obtained.
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`4. Brief description ofdrawings
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`The drawings show examples of the embodiments of the present invention, Fig.
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`1 represents a disassembled oblique view, Fig. 2 represents a circuit diagram of a
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`detection circuit, and Fig. 3 represents a circuit diagram showing a detection condition.
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`I “““a display surface, 2 """ a dielectric material, 3 """an insulator material, X”,
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`Xm, XO-X4 """electrodes (first electrodes), Yn, YnH, YU-YS """electrodes (second
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`electrodes), Px, Py """ pitch, W """width, HFG """ a power source (high-frequency
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`power source), SWx, SWy """a set of switches, Coo-C45 “““ a capacity (electrostatic
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`capacity), DA """a differential amplifier, DET"""a detection circuit, CONT“““ a
`control section
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`Applicant: Yamatakc-Honeywell Co., Ltd.
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`fir‘nfifls [51- 84 $29 ( 4)
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`DO
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`control —"‘—*US=¢
`section
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`7
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`mean Sluts
`1* Im”: 33
`mfldml.m
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`TRANSLATION CERTIFICATION
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`Document Translated For:
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`m_ 090110017
`E_ Finne an. Henderson, Farabow, Garrett & Dunner, LLP
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`Description ofDocnmeufls):
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`P 1-8472 Number of documents:
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`60-75927
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`nof
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`Target Language:
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`English
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`WITH REFERENCE TO THE ABOVE MENTIONED MATERIALSIDOCUMENTS:
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`[Tagging of .12 @4592? and ,1! “£72”. I, Marianna TSANG. a certified translator and
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`Date: August 1,2013
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`interpreter. affirm that the Japanese to English translation represents. to the best of my judgment.
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`an accurate and correct interpretation of the terminology and content of the source document(s).
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`This is to certify the correctness of the translation only.
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`By: Mariann
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`Mariam Tsung
`{Japanese and English}
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`Cflurm-HWITM
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