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1. 发明专利

JPH08313306A ABSOLUTE ENCODER 失效
公开(公告)号：JPH08313306A
公开(公告)日：1996-11-29
申请号：JP14125795
申请日：1995-05-16
申请人： COPAL CO LTD
发明人： ODAJIMA SHIN , FUKUDA TAKUMI , YANAGISAWA MITSURU
IPC分类号： G01D5/245 , G01D5/244 , G01D5/36
摘要： PURPOSE: To conduct a power on/off switching operation producing no error in detecting rotation frequency even at high speed rotation in a multi-rotation absolute encoder by means of a battery speed rotation in a multi-rotation absolute encoder by means of a battery backup method. CONSTITUTION: A periodic signal output from a light receiving element 5 is processed by a processing circuit so that the absolute position of a rotation slit plate 1 is read out. The cycle signal is simultaneously counted by a counting circuit so that the rotation frequency of the rotation slit plate 1 is read out. At a power failure, only the rotation frequency is read out receiving an internal power voltage. A power failure detection portion 7 monitors an external power voltage so that a corresponding detection signal DT is outputted when a state changes from a power on-state to the power failure. First switch 8 operates in response to the detection signal DT so that a drive current fed to a light emitting element 3 is switched from a normal level to a minute level. A delay circuit 9 produces a control signal CTL delaying a predetermined time from the detection signal DT. Second switches 41 to 44 operate in response to the delayed control signal CTL so that the load resistor of the light receiving element 5 is switched from a low level to a high level.

2. 发明专利

JPH05333055A 失效
公开(公告)号：JPH05333055A
公开(公告)日：1993-12-17
申请号：JP15737492
申请日：1992-05-26
申请人： COPAL CO LTD
发明人： TONOGAI YOSHIHIDE , YANAGISAWA MITSURU , TAKAGI MASAAKI
IPC分类号： G01P15/125
摘要： PURPOSE:To obtain an electrode taking-out structure capable of preventing a drift dependent on temperature and fatigue failure of an acceleration detector. CONSTITUTION:A sensor board 7 is mounted on a sensor base 10. It is provided with a lower side fixing board 1 having an electrode pattern conducted over both faces thereof and an upper side fixing board 2, which has the electrode pattern conducted over both the faces, opposed to and arranged over the lower fixing board 1 through a specified clearance. A conduction plate lies within another clearance between both the boards and there is a movable electrode part capable of displacement in accordance with acceleration between the inner face side electrode patterns of both the fixing board. The conduction plate is conducted in the electrode pattern of at least either of the fixing boards 1, 2. A flexible board 3 has a wiring pattern 4 pressure-welded to the outer side electrode patterns of both the fixing boards 1, 2 and a pair of the fixing boards 1, 2 are sandwiched from upward and downward in a bent condition.

3. 发明专利

JPH10221118A ABSOLUTE ENCODER WITH DETECTION BACKUP OF SPEED OF ROTATION 失效
公开(公告)号：JPH10221118A
公开(公告)日：1998-08-21
申请号：JP4155997
申请日：1997-02-10
申请人： COPAL CO LTD
发明人： YANAGISAWA MITSURU
IPC分类号： G01D5/245 , G01D5/244 , G01D5/249
摘要： PROBLEM TO BE SOLVED: To obtain an absolute encoder which reduces a consumed current in a power- failure operation. SOLUTION: A light-receiving circuit contains a light-receiving element 5 which is faced with an LED 1 via an encoder plate, a rotation signal is output at every rotation of the encoder plate in a power-failure operation, and a pulse signal is output continuously in an ordinary operation. A processing circuit 6 and a processing circuit 7 process the pulse signal in the ordinary operation, and they output an address signal and a rotation signal. A D-FF 8 latches the rotation signal from the light-receiving circuit in the power-failure operation. A timing circuit 13 controls the respective circuits so as to be changed over on the basis of a lock signal CLK in a shift between the power-failure operation and the ordinary operation. The timing circuit starts a clock generation circuit 14 according to the rise of a power supply to the ordinary operation from the power-failure operation, it receives the supply of the clock signal CLK which is required to control the respective circuits so as to be changed over, and it stops the oscillation operation of the clock generation circuit after the changeover control of the respective circuits corresponding to power shutoff from the normal operation to the stop operation is completed.

4. 发明专利

JPH08181348A PHOTOELECTRIC CONVERTER 失效
公开(公告)号：JPH08181348A
公开(公告)日：1996-07-12
申请号：JP33642894
申请日：1994-12-22
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI , YANAGISAWA MITSURU
IPC分类号： H01L31/10 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/60 , H04B10/02 , H04B10/28
摘要： PURPOSE: To operate stably against temperature changes and simplify device structure by arranging a current mirror circuit to operate in conformity with a current being output from an auxiliary light receiving device for compensation service and directly deducting a dark current component included in a detection current output from a main light receiving device. CONSTITUTION: A photoelectric switch is provided with a light receiving device 1, an auxiliary light receiving device 2, a current mirror circuit 3 and a processing circuit 1. The main light receiving device 1 generates a detection current 1p including a dark current component 1n dependent on a surrounding temperature in addition to a photoelectric current 1s in conformity with a light receiving quantity of an incident light L. The auxiliary light receiving device 2 is provided with the same structure with a phototransistor on the main light receiving device 1 side and generates the same quantity of dark current 1c to the dark current component 1n. The current mirror circuit 3 provides a net amount of detection current which excludes the dark current component 1n by generating the compensation current in conformity with a pure dark current component 1d and deducting from the detection current 1p. The processing circuit 4 processes a net detection current 1s flowing in a resistor R and generates an output signal Vout.

5. 发明专利

JPH05333044A 失效
公开(公告)号：JPH05333044A
公开(公告)日：1993-12-17
申请号：JP15737192
申请日：1992-05-26
申请人： COPAL CO LTD
发明人： TONOGAI YOSHIHIDE , YANAGISAWA MITSURU , TAKAGI MASAAKI
IPC分类号： G01P15/08
摘要： PURPOSE:To improve shock resistances of a sensor block incorporated in an acceleration detecting apparatus. CONSTITUTION:A sensor block 1 is mounted on a sensor base 3 via a damper stage 2. The sensor block 1 has a sensitive mass body which shifts in response to the acceleration of a relatively low frequency band. On the other hand, the damper stage 2 is provided with an elastic body having a frequency of normal mode of vibration sufficiently higher than the frequency band. The damper stage 2 securely holds the sensor block 1. The elastic body has a central part to be bonded with the sensor block 1 and a plurality of elastic arm parts 9 extending from the central part to the periphery. The damper stage 2 is rigidly fixed to the sensor base 3 via end parts of the elastic arm parts 9. The elastic arm part 9 has a predetermined elasticity to the direction of a normal line of the sensor base 3 coincident with the detecting direction of the acceleration and a direction orthogonal to the direction of the normal line.

6. 发明专利

JPH07260515A ABSOLUTE ENCODER 失效
公开(公告)号：JPH07260515A
公开(公告)日：1995-10-13
申请号：JP7278094
申请日：1994-03-17
申请人： COPAL CO LTD
发明人： YANAGISAWA MITSURU , FUKUDA TAKUMI
IPC分类号： G01D5/245 , G01D5/244 , G01D5/249 , G01D5/34 , G01D5/347 , G01D5/36
摘要： PURPOSE:To downsize an absolute encoder by generating at least four bit signals out of a single track. CONSTITUTION:A moving body is parallelly provided with tracks T having occulting slit patterns, and light receiving elements A1-A4 receive illumination light through the occulting slit patterns to output detection signals A1-A4 for each track. A processing circuit processes the detection signals A1-A4 to generate bit signals P1-P4 to read a position of the moving body. A waveform forming part 1 uses the detection signals A1-A4 to form four primary chevron shape signals A1-A4 having equal periods and phases 90 degrees shifted in sequence, and further synthesizes secondary trapezoidal signals A5, A6 of half a phase 45 degrees shifted. A comparison operation part 2 mutually compares and processes the four chevron shape signals A1-A4 and the two trapezoidal signals A5, A6 to generate eight rectangular signals of deviated phases. A logic operation part 3 mutually logic-processes the eight rectangular signals to output at least four bit signals P1-P4 from a single track T.

7. 发明专利

JPH05333054A 失效
公开(公告)号：JPH05333054A
公开(公告)日：1993-12-17
申请号：JP15737392
申请日：1992-05-26
申请人： COPAL CO LTD
发明人： TONOGAI YOSHIHIDE , YANAGISAWA MITSURU , TAKAGI MASAAKI
IPC分类号： G01P15/125
摘要： PURPOSE:To easily perform positioning of an electrostatic capacity type detector having a laminating structure and improve assembly. CONSTITUTION:An acceleration detector is assembled on an attaching base 1 on which a support shaft 2 is embedded. A cylindrical fixing bush 11 with a cross section different shape is engaged with the support shaft 2. A lower side fixing electrode board 12 has electrode patterns on both faces of a front face and a rear face and is engaged with said fixing bush 11 through a different shape owing 13 for the purpose of being positioned and held. In addition, an upper fixing electrode board 17 is also engaged with the fixing bush 11 through another different shape opening 18 for the purpose of being positioned and held. Furthermore, a movable electrode piece 15 is also inserted in a fixing bush 11, held therein, exists between both the fixing electrode boards 12, 17 and constitutes a differential capacity.

8. 发明专利

JPH07260514A ABSOLUTE ENCODER 失效
公开(公告)号：JPH07260514A
公开(公告)日：1995-10-13
申请号：JP7277994
申请日：1994-03-17
申请人： COPAL CO LTD
发明人： YANAGISAWA MITSURU , FUKUDA TAKUMI
IPC分类号： G01D5/245 , G01D5/244 , G01D5/249 , G01D5/34 , G01D5/347 , G01D5/36
摘要： PURPOSE:To downsize an absolute encoder by generating at least three bit signals out of a single track. CONSTITUTION:A moving body is parallelly provided with tracks T having occulting slit patterns, and light receiving elements A1-A4 receive illumination light through the occulting slit patterns to output detection signals A1-A4 for each track. A processing circuit processes the detection signals A1-A4 to generate bit signals P1-P3 to read a position of the moving body. The processing circuit is provided with an input part 1, comparison operation part 2 and logical operation part 3. The input part 1 by using the detection signals A1-A4 inputs a plurality of chevron shape signals having equal periods and deviated phases. The comparison operation part 2 mutually compares and processes a plurality of chevron shape signals to generate a plurality of rectangular signals having deviated phases. The logical operation part 3 mutually logic-processes a plurality of the rectangular signals to output at least three bit signals P1-P3 for each track.

9. 发明专利

JPH07239248A ABSOLUTE ENCODER 失效
公开(公告)号：JPH07239248A
公开(公告)日：1995-09-12
申请号：JP5316894
申请日：1994-02-25
申请人： COPAL CO LTD
发明人： YANAGISAWA MITSURU , FUKUDA TAKUMI , ODAJIMA SHIN
IPC分类号： G01D5/245 , G01D5/249 , H03M1/24
摘要： PURPOSE:To decrease the number of components by providing a processing circuit with an operating means, adding and comparing significant signals using a sync signal, and producing a significant bit reproduction signal in synchronism with the rising or falling of a less significant bit reproduction signal thereby constituting an efficient processing circuit. CONSTITUTION:Upper and lower tracks T1, T0 comprising binary coded tetradic bit codes along the moving direction of a disc are arranged in parallel and a transmitting light from an LED is read out by means of light receiving arrays 1, 4 which output detection signals A 0-A 3. The detection signals are added and compared by operating means 5-20 in a processing circuit to produce bit reproduction signals P0-P3 and the absolute address of a mobile is read out. In this regard, a significant bit reproduction signal P2 is produced in synchronism with the rising or falling of a less significant bit reproduction signal P0 thus preventing the timing from being shifted. On the other hand, one significant bit reproduction signal P3 is fed back and subjected to exclusive-ORing with the reproduction signal P0 in order to synchronize the reproduction signal P2 thus simplifying the circuitry.

10. 发明专利

JPH06341857A ABSOLUTE ENCODER PROVIDED WITH NUMBER-OF-REVOLUTIONS DETECTION BACKUP 失效
公开(公告)号：JPH06341857A
公开(公告)日：1994-12-13
申请号：JP15158993
申请日：1993-05-28
申请人： COPAL CO LTD
发明人： YANAGISAWA MITSURU
IPC分类号： G01D5/245 , G01D5/244 , G01D5/249
摘要： PURPOSE:To guarantee the continuity of the detection of the number of revolutions through an ordinary operation and a sevice-interruption operation in an absolute encoder provided with a number-of-revolutions detection backup. CONSTITUTION:A light-emitting circuit 1 contains a light-emitting element, it selectively performs a light-emitting operation in a service-interruption operation and in an ordinary operation. A light-receiving circuit 2 contains a photodetector and the light-emitting element opposite to each other via an encoder plate 3, directly outputs a rotation signal at every rotation of the encoder plate 3 the service-interruption operation, and continuously outputs a pulse signal in the ordinary operation. A processing circuit 4 processes the pulse signal in the ordinary operation, and it outputs an address signal and a rotation signal. A storage circuit 5 latches the rotation signal from the light-receiving circuit 2 in the service-interruption operation. A counting circuit 7 always accepts and counts the rotation signal from either the processing circuit 4 or the storage circuit 5 via a gate circuit 6. A timing circuit 8 controls a changeover operation in the service-interruption operation and in the ordinary operation. That is to say, a changeover signal is supplied to the light-emitting circuit 1 and the light- receiving circuit 2, a prescribed mask signal is supplied to the processing circuit 4 and the storage circuit 5, the malfunction of the detection of the rotation signal in the rise and the fall of a power supply is prevented, and the continuity of the encoder is maintained.

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