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1. 发明专利

JPH09184778A TENSION DETECTOR 失效
公开(公告)号：JPH09184778A
公开(公告)日：1997-07-15
申请号：JP35342995
申请日：1995-12-29
申请人： COPAL CO LTD
发明人： HOSOHATA NOBUHIKO , TONOGAI YOSHIHIDE
IPC分类号： G01L5/06 , D01H13/16
摘要： PROBLEM TO BE SOLVED: To improve the linearity of detection output for tension applied to a string. SOLUTION: A tension detector has a movable body 3 and a potentiometer 2. The movable body 3 is engaged to a string 5 which is fed by tension and is rotated and displaced according to the tension. The potentiometer 2 is connected to the movable body 3 and detects the rotary displacement. The movable body 3 has a pair of guide members 3a and 3b and are arranged on a straight line D which passes through a rotary center O and are separated each other in opposite directions from the rotary center O. A pair of guide members 3a and 3b guide the string 5 to be fed, receive the operation of the tension T, and generate a rotary force which is nearly proportional to it. In this case, the posture of the movable body 3 is maintained so that the straight line D for connecting a pair of guide members 3a and 3b nearly crosses the direction of the tension T being applied to the string 5.

2. 发明专利

JPH0743176A OPTICAL NONCONTACT POTENTIOMETER 失效
公开(公告)号：JPH0743176A
公开(公告)日：1995-02-10
申请号：JP20593093
申请日：1993-07-27
申请人： COPAL CO LTD
发明人： TAKAGI MASAAKI , HOSOHATA NOBUHIKO , GOTO TATSUKI
IPC分类号： G01D5/347 , G01D5/34
摘要： PURPOSE:To eliminate the influence of external temperature and stabilize the operation of an optical noncontact potentiometer. CONSTITUTION:An optical noncontact potentiometer is formed of a slit plate 1, a light source 4, a position detecting element 6, and a processing means 10. The slit plate 1 is connected to a body to be measured and moved according to its displacement. The light source 4 emits a luminous flux into the slit plate 1. The position detecting element 6 is arranged along the moving orbit of the luminous flux emitted through the slit plate 1, and outputs detection signals 1A, 1B according to the receiving position of the luminous flux. The processing means 10 processes the detection signals 1A, 1B to generate the displacement information for the body to be measured. The light source 4 is driven to oscillate pulses by an oscillating circuit 21 to intermittently emit the luminous flux. The position detecting element 6 receives the intermittent luminous flux and outputs the detection signals 1A, 1B containing change components according to the pulse oscillating frequency and DC components such as temperature dependent dark current. The processing means 10 comprises a pretreatment circuit 17 for removing the DC components from the detection signals 1A, 1B and an after- treatment circuit 18 for arithmetically processing the remaining change components to determine the displacement information.

3. 发明专利

JPH06341859A OPTICAL SIN/COS FUNCTION OUTPUT POTENTIOMETER 失效
公开(公告)号：JPH06341859A
公开(公告)日：1994-12-13
申请号：JP15623093
申请日：1993-06-02
申请人： COPAL CO LTD
发明人： TAKAGI MASAAKI , HOSOHATA NOBUHIKO , GOTO TATSUKI
IPC分类号： G01D5/347 , G01D5/34
摘要： PURPOSE:To provide an optical sin/cos function output potentiometer which is simple and practical. CONSTITUTION:This optical sin/cos function output potentiometer is composed of a movement member, a fixed light source 5, a fixed photodetector 7 and a processing circuit 11. The movement member is composed of a disk 1 which is turned and displaced around a shaft 2 as the center, and it is provided with a circular slit 3 which is eccentric to the shaft 2. The fixed light source 5 emits light with which the disk 1 is irradiated. The photodetector 7 is provided with a long-shaped light-receiving face 8 arranged along the radial direction of the disk 1, receives transmitted light 9 from the circular slit 3 which is moved periodically due to the rotation and displacement of the disk, and outputs a detection signal according to a light-receiving position 10. The processing circuit 11 outputs a sin/cos function signal on the basis of the detection signal.

4. 发明专利

JPH06341858A OPTICAL DISPLACEMENT DETECTION APPARATUS 失效
公开(公告)号：JPH06341858A
公开(公告)日：1994-12-13
申请号：JP15622993
申请日：1993-06-02
申请人： COPAL CO LTD
发明人： TAKAGI MASAAKI , HOSOHATA NOBUHIKO
IPC分类号： G01D5/347 , G01D5/34
摘要： PURPOSE:To correct the detection error of an optical displacement detection apparatus. CONSTITUTION:This optical displacement detection apparatus is provided with a disk 1 in which one pair of slits 3a, 3b have been formed and fixed light sources 4a, 4b which emit the incident light on the disk 1 are provided. In addition, one pair of fixed photodetectors 5a, 5b are contained so as to correspond to the pair of slits 3a, 3b. The photodetector 5a is provided with a long light-detecting face 6a arranged along the movement track of an optical spot 7a which has passed the slit 3a, and it outputs differential detection signals Xa, Ya corresponding to the light-receiving position of the optical spot 7a. In the same manner, the other photodetector 5b outputs one pair of differential detection signals Xb, Yb. The optical spot 7a from the slit 3a on one side and the optical spot 7b from the slit 3b on the other side are moved in mutually opposite directions along the respectively corresponding long light-receiving faces 6a, 6b. A processing circuit 8 processes the detection signals Xa, Ya, Xb, Yb which have been output from both fixed photodetectors 5a, 5b, it outputs displacement information on the disk 1, and it removes an error based on the displacement of the slits on basis of the displacement information.

5. 发明专利

JPH0666596A OPTICAL DISPLACEMENT DETECTOR 失效
公开(公告)号：JPH0666596A
公开(公告)日：1994-03-08
申请号：JP23772292
申请日：1992-08-13
申请人： COPAL CO LTD
发明人： GOTO TATSUKI , HOSOHATA NOBUHIKO , TAKAGI MASAAKI
IPC分类号： G01D5/347 , G01D5/34
摘要： PURPOSE:To reduce a manufacturing cost of a moving plate formed in a condensing lens zone and to improve its reliability. CONSTITUTION:An optical displacement detector comprises a moving plate 1 to be displaced along a plane, a fixed light source 4 for irradiating the plate 1 with an incident light, and a fixed photoreceiver 5 disposed oppositely to the source 4. A lens zone 3 is extended on the plate 1, and when it is displaced, an effective incident light 8 is condensed to generate a moving image 10. The photoreceiver 5 has a photoreceiving surface 6 disposed along a moving direction of the image 10, and outputs a moving plate displacement detection signal from the image photoreceiving position. A pair of prism zones 7 disposed in parallel along both edges of the zone 3 are provided, a invalid incident light 11 or a peripheral indecent light is refracted to the outside out of the surface 6.

6. 发明专利

JPH029023A TRACKING METHOD FOR OPTICAL DISK AND ITS SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH029023A
公开(公告)日：1990-01-12
申请号：JP15792488
申请日：1988-06-28
申请人： COPAL CO LTD
发明人： HOSOHATA NOBUHIKO , TAKAGI MASAAKI , YOSHIKAWA YUKIO
IPC分类号： G11B7/09
摘要： PURPOSE:To exactly execute the tracking by providing a circuit for receiving and outputting a reflected beam light of a track of an optical disk, a circuit for discriminating a frequency area of the reflected light from a pit forming part, and a circuit for outputting a tracking use servo-signal. CONSTITUTION:A reflected light 9 of a beam which has irradiated a pit of a disk 7 passes through a 1/4 wavelength plate 5 and a polarization beam splitter 4, and thereafter, passes through a cylindrical lens 11, and forms a light spot 13 on a four- division detector 12. In accordance with a position relation of an irradiation light spot 8 and the pit, as for a light distribution of the light spot 13, the polarization of the light quantity is different in the direction vertical to a track. Four pieces of diodes 12 are provided so that the light spot 13 is divided equally in the center. Also, a fixed mask 15 is placed in front of a lens 10, and even if a lens 6 moves, the light spot is placed in the center on the detector 12. A control is executed so that an increase of the light shielding quantity negates an offset. A+B and C+D are made from four signals, and when an error signal is obtained by holding the bottom and deriving a difference signal, even in case of CD having no guide groove, the tracking can be executed stably.

7. 发明专利

JPH09236451A OPTICAL POTENTIOMETER 失效
公开(公告)号：JPH09236451A
公开(公告)日：1997-09-09
申请号：JP6730796
申请日：1996-02-28
申请人： COPAL CO LTD
发明人： HOSOHATA NOBUHIKO
IPC分类号： G01D5/347 , G01D5/34
摘要： PROBLEM TO BE SOLVED: To prevent destruction of a light source due to side effect of automatic light quantity control. SOLUTION: An optical potentiometer is provided with a light source 4 which projects light onto a slit disk 1, a photo detecting element 6 which photo- detects transmission light 8 and outputs detection signals IA and IB according to the position and a process circuit 10 which, by processing the detection signals IA and IB, generates output signal Vout representing rotational displacement. In addition, an APC (automatic light quantity control circuit) 15 functions based on the detection signals IA and IB and control the light emission amount of the light source 4 so that the light quantity detected by the photo-detecting element 6 is kept constant. The slit disk 1 is divided into two, a valid angle area where detection of rotational displacement is possible and an invalid angle area where detection of rotational displacement is impossible. A signal slit 3 is formed in the valid angle area and a protection slit 3a is provided in the invalid angle area, so that an automatic light quantity control circuit 15 always performs normal function over the entire angle of the slit disk 1.

8. 发明专利

JPH0618287A OPTICAL SHIFT DETECTING APPARATUS 失效
公开(公告)号：JPH0618287A
公开(公告)日：1994-01-25
申请号：JP20030392
申请日：1992-07-03
申请人： COPAL CO LTD
发明人： TAKAGI MASAAKI , GOTO TATSUKI , HOSOHATA NOBUHIKO
IPC分类号： G01D5/347 , G01D5/34 , G02B5/04
摘要： PURPOSE:To improve the utilizing efficiency of the light of a light source of an optical shift detecting apparatus and to improve the linearity of detecting signals and the S/N ratio. CONSTITUTION:The optical shift detecting apparatus is constituted of a fixed light source 9 emitting a luminous flux 11, a lens member 10 condensing the luminous flux 11 to a spot 12, a circular shift plate 1 where a prism band 3 with a apex angle 4 changing continuously corresponding to the rotating angle is extended, and a fixed photodetecting element 13 for detecting the spot 12 through the prism band 3. When the prism band 3 is rotated to pass the luminous flux 11, the apex angle 4 is changed and the spot 12 is deflected, and moreover, differential detecting signals A, B are output in accordance with the change of the detecting position of the spot 12.

9. 发明专利

JPH03132928A FOCUS ADJUSTING DEVICE FOR OPTICAL PICKUP DEVICE 失效
公开(公告)号：JPH03132928A
公开(公告)日：1991-06-06
申请号：JP27206689
申请日：1989-10-19
申请人： COPAL CO LTD , FUJITSU LTD
发明人： HOSOHATA NOBUHIKO , YOSHIKAWA YUKIO , TAKAGI MASAAKI
IPC分类号： G11B7/09
摘要： PURPOSE:To always secure focus precision by making a value obtained by subtracting a calculated correction value from the center light receiving quantity deviation of the photodetector of each system as a focus error signal. CONSTITUTION:An objective lens 4 is servo-driven so that the center receiving quantity deviation of the detectors 8, 9 of two systems converges to 0, and simultaneously, a component equivalent to center light receiving quantity at a focusing point out of unbalance of light quantity being generated in the total light receiving quantity of each detector 8, 9 is subtracted from the center light receiving quantity deviation, and the influence of the unbalance of the light quantity can be removed at the focusing point. Thus, focus adjustment is executed without being influenced by the unbalance of detected light quantities at the detectors 8, 9 of two systems.

10. 发明专利

JPH06249677A OPTICAL ROTATIONAL POSITION DETECTING DEVICE 失效
公开(公告)号：JPH06249677A
公开(公告)日：1994-09-09
申请号：JP6308293
申请日：1993-02-26
申请人： COPAL CO LTD
发明人： GOTO TATSUKI , HOSOHATA NOBUHIKO , TAKAGI MASAAKI
IPC分类号： G01D5/347 , G01D5/34
摘要： PURPOSE:To prevent the flexural deformation of a rotating disk having a spiral slit by reinforcing the disk and, at the same time, to stabilize the rotation detecting output of an optical rotational position detecting device. CONSTITUTION:The title detecting device is constituted of a disk 1 which is rotationally displaced around a rotating shaft 2 and light source 6 and photoreceptor element 7 which are counterposed to each other on both sides of the disk 1. A spiral slit 3 is formed on the surface of the disk 1 along the peripheral direction. The light from the light source 6 is made incident on the disk 1. On the other hand, the photoreceptor element 7 has a long light receiving surface 1 extended along the diametral direction of the disk 1, receives the light 9 transmitted through the slit 3 moving along the diametral direction as the disk 1 is rotated, and outputs a rotating position detecting signal. In order to reinforce the disk l, a beam section 4 is provided along the width direction of the slit 3. In order to stabilize the detecting signals, in addition, a pair of correcting holes 5 of different sizes are provided on both sides of the beam section 4 in the diametral direction of the slit width so that the total area of the holes 5 can become the same as that of the beam section 4.

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