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1. 发明专利

JP2003139746A INSTRUMENT FOR MEASURING CHARACTERISTIC VALUE OF LIQUID USING ELASTIC SURFACE WAVE DEVICE 审中-公开
公开(公告)号：JP2003139746A
公开(公告)日：2003-05-14
申请号：JP2001332818
申请日：2001-10-30
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO
IPC分类号： G01N29/02 , G01N11/00 , G01N11/16
摘要： PROBLEM TO BE SOLVED: To secure a wide measuring range as the whole instrument, and to precisely measure a characteristic value of a liquid within the measuring range, in a characteristic value measuring instrument for the liquid using an elastic surface wave device. SOLUTION: This characteristic value measuring instrument for the liquid using the elastic surface wave device comprises a plurality of sensor parts having the elastic surface wave devices respectively, and a measuring part provided with a memory and a micro-computer. The memory stores respective operation expressions for indicating correlations between characteristic signals and the characteristic values of the liquid corresponding respectively to the elastic surface wave devices. When the characteristic value of the liquid is measured, the operation expression suitable to detect the characteristic value of the liquid is selected out of the plural operation expressions or a table stored in the memory, and the micro-computer inputs the characteristic signal from the elastic surface wave having the selected operation expression to compute the characteristic value.

2. 发明专利

JP2001153782A APPARATUS USING SURFACE ACOUSTIC WAVE DEVICE FOR DETECTING LIQUID CHARACTERISTIC VALUE 失效
公开(公告)号：JP2001153782A
公开(公告)日：2001-06-08
申请号：JP33824799
申请日：1999-11-29
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO , SUGIURA TAKAHIRO , TAKEHARA KAZUYUKI , SATO HAJIME
IPC分类号： G01N11/16
摘要： PROBLEM TO BE SOLVED: To obtain a correct viscosity by improving a temperature-compensating function without greatly increasing costs in a liquid characteristic value-detecting apparatus. SOLUTION: A surface acoustic wave device 21 of the characteristic value- detecting apparatus operates when signals from an oscillator 11 are inputted, and generates a characteristic value signal indicating a characteristic value of a liquid in contact with a sensing face 21d. A microcomputer 14 operates the characteristic value of the liquid based on the characteristic value signal and outputs the value. The apparatus is further provided with a temperature sensor 23 for detecting a temperature of the surface acoustic wave device and a memory device 15 in which a table for temperature compensating the characteristic value signal is stored. The microcomputer operates a final characteristic value signal temperature compensated on the characteristic value signal, the temperature detected by the temperature sensor and the table, and outputs the final characteristic value signal. The surface acoustic wave device and the temperature sensor are set to a sensor part 20, and the other members are preferably set to a measuring part 10 separate from the sensor part.

3. 发明专利

JP2001153781A SURFACE ACOUSTIC WAVE APPARATUS FOR MEASURING CHARACTERISTIC VALUE OF LIQUID 失效
公开(公告)号：JP2001153781A
公开(公告)日：2001-06-08
申请号：JP33581299
申请日：1999-11-26
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO
IPC分类号： G01N11/16
摘要： PROBLEM TO BE SOLVED: To surely and correctly measure a viscosity and the like of a liquid by setting a cover for liquid-tightly covering input/output electrodes and a conductive member thereby forming a space to the input/output electrodes and the conductive member in a surface acoustic wave apparatus for measuring characteristic values of the liquid. SOLUTION: The surface acoustic wave apparatus 40 is composed of a surface acoustic wave device 42 set on a base 41 and having the combed input electrode 44 and the combed output electrode 45 arranged in parallel along a propagation direction of surface acoustic waves on a piezoelectric substrate 43, and a plurality of metallic wires 49a, 49b, 49c and 49d led out from the input electrode 44 and the output electrode 45 respectively. Covers 50a and 50b are set to an upper face of the base, which liquid-tightly cover the input electrode 44, the output electrode 45 and the wires 49a, 49b, 49c and 49d while leaving a sensing face 43a between the input electrode 44 and the output electrode 45, thereby forming spaces S to the electrodes and the wires.

4. 发明专利

JP2001153780A CHARACTERISTIC-VALUE DETECTING APPARATUS FOR LIQUID USING SURFACE ACOUSTIC WAVE DEVICE 失效
公开(公告)号：JP2001153780A
公开(公告)日：2001-06-08
申请号：JP33294399
申请日：1999-11-24
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO
IPC分类号： G01N11/16
摘要： PROBLEM TO BE SOLVED: To prevent an error from being generated in a detection result due to the instrumental error or the degradation of a surface acoustic wave device and to detect the characteristic value in a wide range of a liquid by using only one characteristic- value detecting apparatus in the characteristic-value detecting apparatus for the liquid. SOLUTION: The surface acoustic wave device 21 in the characteristic-value detecting apparatus comprises a sensing face 21d. It is operated when a signal from an oscillator 11 is input. It detects the characteristic value such as the viscosity coefficient or the like of the liquid coming into contact with the sensing face. It outputs a signal which expresses its detection result. A microcomputer 13 computes and outputs the characteristic value of the liquid on the basis of the output from the surface acoustic wave device. An adjusting circuit 30 which continuously adjusts the signal amount of the signal is installed on at least one out of the front side and the rear side of the surface acoustic wave device, and it prevents an error in the detection result due to the instrumental error or the degradation of the surface acoustic wave device. When a changeover circuit 35 which changes over the signal amount stepwise is installed instead of the adjusting circuit, a detecting range can be changed over.

5. 发明专利

JP2002168751A LIQUID CHARACTERISTIC VALUE DETECTOR USING CHARACTERISTIC VALUE SENSOR 失效
公开(公告)号：JP2002168751A
公开(公告)日：2002-06-14
申请号：JP2000365125
申请日：2000-11-30
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO
IPC分类号： G01N11/00
摘要： PROBLEM TO BE SOLVED: To easily and securely determine the extent of deterioration of a liquid in a characteristic value detector of the liquid. SOLUTION: An elastic surface wave device 21 of the characteristic value detector produces a characteristic value signal showing the characteristic value of the liquid in contact with a sensing surface 21d, and a microcomputer 14 calculates the characteristic value of the liquid based on the characteristic signal. The detector further comprises a temperature sensor 23 for detecting a temperature of the elastic surface wave and a storage device 15 for storing a computing equation or a table showing a temperature characteristic regarding a characteristic value of a reference liquid which is not deteriorated. The microcomputer 14 calculates a reference characteristic value at the temperature indicated by a temperature signal based on the temperature signal inputted from the temperature sensor device and the computing equation or the table stored in the storage device 15. The calculated reference characteristic value is compared with the characteristic value of the liquid calculated based on the inputted temperature signal and the reference signal inputted about the same time, and the result of the comparison is shown on a display 16.

6. 发明专利

JP2000223990A SURFACE ACOUSTIC WAVE FILTER DEVICE 失效
公开(公告)号：JP2000223990A
公开(公告)日：2000-08-11
申请号：JP2028099
申请日：1999-01-28
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO , MIURA TSUTOMU
IPC分类号： H03H9/145 , H03H9/64
摘要： PROBLEM TO BE SOLVED: To reduce a cross length at the end of a weighting electrode and to reduce the diffraction of surface acoustic waves after suppressing the change of frequency characteristics as much as possible. SOLUTION: This surface acoustic wave filter device is provided with a piezoelectric substrate and a weighting electrode 20 and a normal electrode are arranged side by side in the propagation direction of the surface acoustic waves on the substrate. The cross length ai (i is an even number) of respective cross parts where the adjacent electrode fingers of the weighting electrode 20 cross each other is set to a value designed by a design method for optimizing the frequency characteristics, a mini-max method for instance. At the time, even at the time of respectively reducing the cross lengths ai and ai+2 of both cross parts so as to keep the difference ai-ai+2 of the cross lengths of the adjacent cross parts fixed at the end part of the weighting electrode 20, frequency components obtained by the cross parts are maintained almost the same in a desired frequency band.

7. 发明专利

JP2000307374A SURFACE ACOUSTIC WAVE FILTER 失效
公开(公告)号：JP2000307374A
公开(公告)日：2000-11-02
申请号：JP11519099
申请日：1999-04-22
申请人： MARUYASU & CO LTD
发明人： HIRANO YOSHIHIRO , MIURA TSUTOMU
IPC分类号： H03H9/145 , H03H9/64
摘要： PROBLEM TO BE SOLVED: To decrease a tilted electrode pattern of a weighted electrode through a simple design without increasing the chip size. SOLUTION: This filter is provided with a piezoelectric substrate, and a weighted electrode and a regular electrode are placed on this substrate side by side in a propagating direction of a surface acoustic wave. Total number of effective parts of 1st and 2nd electrode fingers 33, 34 is selected to be an odd number in the regular electrode. In order that the surface acoustic wave filter employing this regular electrode has a desired frequency characteristics, the design method to optimize the frequency characteristics, e.g. the minimax method is employed to design the weighted electrode. The tilted electrode pattern of the weighted electrode can be decreased even when this minimax method is in use.

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