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1. 发明专利

JPH10122906A OPTICAL ENCODER 失效
公开(公告)号：JPH10122906A
公开(公告)日：1998-05-15
申请号：JP29747796
申请日：1996-10-18
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI
IPC分类号： G01D5/36 , G01D5/34 , G01D5/347 , G02B17/08
摘要： PROBLEM TO BE SOLVED: To prevent jump or omission of amplitude waveform outputted from an optical encoder to stabilize it. SOLUTION: A moving plate 1 has slits 5 arranged at fixed period P along the moving direction connecting a first region to a second region. A light-source 2 illuminates the slits 5 passing through the first region to form slit images. Projecting means 4 equimultiple-transforms the slit images illuminated on the first region into inverted slit real images to project these images onto the second region. A light receiving element 3 use the slits 5 passing through the second region as a mask to receive the slit real images moving in opposite direction to detect displacement of the moving plate. The splits 5 are arranged equally and separately on two tracks 51, 52 extending along the moving direction connecting the first region to the second region, and the two groups of the slits 5 respectively attaching to both the tracks are reversed in phase for the same period. On the other hand, the light receiving element 3 has a light receiving face, the size of which can receiver the slit real images equivalent to the two tracks in the lump.

2. 发明专利

JPH09145409A OPTICAL ENCODER 失效
公开(公告)号：JPH09145409A
公开(公告)日：1997-06-06
申请号：JP33274095
申请日：1995-11-27
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI
IPC分类号： G01D5/36
摘要： PROBLEM TO BE SOLVED: To double the resolution of an optical encoder, and enhance utilization efficiency of the light of a light source. SOLUTION: An optical encoder is provided with a moving plate 1 to pass through a first area A and a second area B, a light source 2 and a light receiving element 3 positioned on the under surface side of the moving plate 1 and a projecting means 4 interposed between the first area A and the second area B on the upper surface side of the moving plate 1. The moving plate 1 is provided with slits 5 which connect the first area A and the second area B to each other and are arranged at a constant pitch in the moving direction. The light source 2 forms a slit object image by illuminating the slits 5 passing through the first area A. The projecting means 4 converts the slit object image lighted out in the first area A into a reversed slit real image in equal magnification, and projects it on the second area B. The light receiving element 3 receives the slit real image moving in the opposite direction by using the slits passing through the second area B as a mask, and detects displacement of the moving plate 1. The projecting means 4 is composed of an integrated prism, and is provided with a collimator lens 6 opposed to the first area A, an image forming lens 7 opposed to the second area B and at least four mirrors M to rotate the image by bending the optical path of both lenses 6 and 7.

3. 发明专利

JPH08233608A OPTICAL ENCODER 失效
公开(公告)号：JPH08233608A
公开(公告)日：1996-09-13
申请号：JP6488995
申请日：1995-02-28
申请人： COPAL CO LTD
发明人： NOGUCHI HIROYASU , FUKUDA TAKUMI , NUNOKAWA HIROYUKI
IPC分类号： G01D5/30 , G01D5/34 , G01D5/347
摘要： PURPOSE: To make an optical encoder compact and heighten the use efficiency of light. CONSTITUTION: An optical encoder is provided with a light emitting element 1, a light receiving element 2 and a moving plate 3. The moving plate 3 is displaced along a specified moving direction. The light emitting element 1 is disposed in a first fixed point in a width direction orthogonal to the moving direction as well as facing the front side of the light emitting element 1. The light receiving element 2 is disposed in a second fixed point spaced from the first fixed point along the width direction as well as facing the front side of the moving plate 3. A plurality of lenses 4 arrayed at a constant pitch P along the moving direction are formed on the surface side of the moving plate 3, and the individual lenses have sufficient width dimension W in order to cover the first fixed point and the second fixed point. An incoming total reflection plane 5S continuous in the moving direction so as to pass the first fixed point, and an outgoing total reflection plane 5T continuous in the moving direction so as to pass the second fixed point and also opposed to the incoming total reflection plane 5S are formed on the back side of the moving plate 3.

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

JPH09138143A OPTICAL ENCODER 失效
公开(公告)号：JPH09138143A
公开(公告)日：1997-05-27
申请号：JP31951095
申请日：1995-11-14
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI
IPC分类号： G01D5/36
摘要： PROBLEM TO BE SOLVED: To correct the phase error of an electric signal caused by the dispersion/ convergence of the luminous flux emitted from a light source. SOLUTION: An optical encoder comprises an optical system, wherein a light source 1, a displaceable moving slit plate 2, a fixed slit plate 3 and photodetectors 4A and 4B are arranged along an optical axis O. The moving slit plate 2 has a slit line C having a specified period, which is aligned in the displacement direction so as to cross the optical axis O. The fixed slit plate 3 has slit lines A and B having the specified period, which are arranged in the displacement direction and have the mutually shifted space phases. The light source 1 irradiates the luminous flux on the slit line C of the moving slit plate 2 along the optical axis O. The photodetectors 4A and 4B separately receive the luminous flux through the respective slit lines A and B of the fixed slit plate 3 and output a pair of the electric signals having the period in correspondence with the displacement amount of the moving slit plate 2 and the relative phase relationship in correspondence with the displacement direction. A toric lens 5 is inserted so as to be across the optical axis O of the light source 1 and rotatably held around the optical axis O. The error, which appears in the relative phase relationship of a pair of the electric signals, can be adjusted in this way.

6. 发明专利

JPH09138142A OPTICAL ENCODER 失效
公开(公告)号：JPH09138142A
公开(公告)日：1997-05-27
申请号：JP31950995
申请日：1995-11-14
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI
IPC分类号： G01D5/36
摘要： PROBLEM TO BE SOLVED: To correct the phase error appearing in the output of an optical encoder optically. SOLUTION: A moving slit plate 2 has a slit line 20 having a specified period P, which is aligned so as to cross optical axes OA and OB. A fixed slit plate 3 has slit lines 30A and 30B having the specified period P, whose space phases are mutually shifted by P/4 in correspondence with respective light sources 1A and 1B. The light sources 1A and 1B irradiate luminous fluxes LA and LB on the slit line 20 of the moving slit 2 along the optical axes OA and OB, respectively. Photodetectors 4A and 4B separately receive the luminous fluxes through the respective slit lines 30A and 30B of the fixed slit plate 3 and output two electric signals having the relative phase relationship in correspondence with the period corresponding to the displacement amount and displacement direction of the moving slit 2. A wedge-shaped prism 5 is inserted so as to be across the optical axis OB of one light source 1B and held rotatably around the optical axis OB. The error, which appears in the relative phase relationship of two electric signals, can be adjusted in this way.

7. 发明专利

JPH09113315A OPTICAL ENCODER 失效
公开(公告)号：JPH09113315A
公开(公告)日：1997-05-02
申请号：JP29924595
申请日：1995-10-23
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI
IPC分类号： G01D5/36 , G02B17/08
摘要： PROBLEM TO BE SOLVED: To double the resolution of an optical encoder. SOLUTION: An optical encoder is provided with a moving plate 1 which passes through first and second areas A and B, a light source 2 which is counterposed to the area A on the lower surface side of the plate 1, a light receiving element 3 which is counterposed to the area B on the lower surface side of the plate 1, and a light projecting means 4 which is interposed between the areas A and B on the upper surface side of the plate 1. The plate 1 is provided with slits 5 which are arranged at regular pitches along the moving direction of the plate 1 in which the areas A and B are connected to each other. The light source 2 forms the image of the slits by emitting light upon the slits 5 while the slits 5 pass through the area A. The projecting means 4 transforms the image of the slits into an unmagnified inverted real image and projects the real image upon the second area B. The optical system constituted in such a way contains an objective lens 6 faced to the first area A, an image forming lens 7 faced to the second area A, and a relay lens 15 provided between the lenses 6 and 7. The light receiving element 3 receives the real image of the slits 5 which move in the opposite direction by using the slits 5 passing through the area B as a mask and detects the displacement of the moving plate 1.

8. 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.

9. 发明专利

JPH06160116A OPTICAL DISPLACEMENT DETECTING DEVICE 失效
公开(公告)号：JPH06160116A
公开(公告)日：1994-06-07
申请号：JP33547392
申请日：1992-11-20
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI , TAKAGI MASAAKI
IPC分类号： G01D5/38
摘要： PURPOSE:To form an optical displacement detecting device utilizing laser into a unit structure, remove noises, improve the detection sensitivity, and facilitate the optical axis alignment. CONSTITUTION:The coherent light 14 emitted from a light source unit 1 is guided into a main body via a light guide member 2. An interference optical system unit 3 receives the coherent light 14 to generate interference fringes 31. A collection optical system unit 4 collects the coherent light 14 to generate a pin spot 41. A space lattice 32 and a reference slit 42 are formed on a moving body 5. A separating optical member 7 separates the coherent light 14 into two light fluxes. The collection optical unit 4 collects one light flux into the pin spot 41, reverses the pin spot reflected light from the reference slit 42 to return it to the light guide member 2 again, and the returned light is received and detected by the first light receiving element 61. The interference optical unit 3 receives the other separated light flux to generate interference fringes 31, and a light guide member 8 guides the interference fringes 31 to the outside via the space lattice 32.

10. 发明专利

JPH05133772A OPTICAL TYPE DISPLACEMENT SENSING DEVICE 失效
公开(公告)号：JPH05133772A
公开(公告)日：1993-05-28
申请号：JP22881691
申请日：1991-08-14
申请人： COPAL CO LTD
发明人： FUKUDA TAKUMI , TAKAGI MASAAKI
IPC分类号： G01D5/347 , G01D5/36
摘要： PURPOSE:To improve the resolution of an encoder structured according to the geometric optics and widen the spacing between a slit pattern and mask pattern which are situate opposed. CONSTITUTION:An optical type displacement sensing device is provided with a displacement member 2 loaded with possibility of displacement along a specified 1st plane, wherein a periodic slit pattern 1 is provided. At the back of the displacement member 2, a light source 4 is provided to illuminate the slit pattern and produce a primary light/dark image 3 moving along the 1st plane. Using a lens member 6, this primary image 3 is projected with a specified magnification, and an enlarged secondary light/dark image 5 is formed which moves along the specified 2nd plane. A photo-receiving part 8 is arranged fast on the 2nd plane to make light reception in accordance with a periodic mask pattern in compliance with the secondary image 5 in movement, and an electrical signal 7 representing the displacement of the displacement member 2 is emitted.

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