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1. 发明专利

JP2002214729A RADIOGRAPHIC IMAGE PHOTOGRAPHING DEVICE 失效
公开(公告)号：JP2002214729A
公开(公告)日：2002-07-31
申请号：JP2001011360
申请日：2001-01-19
申请人： CANON KK
发明人： YAMADA ETSUO
IPC分类号： G01T1/20 , A61B6/00 , G03B42/02
摘要： PROBLEM TO BE SOLVED: To provide a good image with low noise even when each member is closely-packed and reciprocal spaces come close. SOLUTION: A metallic casing 21 is partitioned into two divisions 23 and 24 with a partition 22, a base 25 is fixed in the partition 23, and an X-ray image detection panel 26 is provided on the base 25. A supply circuit part 30 for supplying electric power to a circuit part in the division 23 is built in the division 24. The casing 21 has the partition 22 in the same way, and is covered with a metallic lid 33 which has X-ray permeability at least on the division 23. The supply circuit part 30 and the circuit part of other sections are isolated by the partitions 22 and 32 provided in the casing 21 and the lid 33. Thereby, an electromagnetic shielding effect can be given, and the circuit part in the division 23 picks up electromagnetic noise generated from the supply circuit part 30 to prevent the lowering of S/N performance.

2. 发明专利

JP2002199388A X-RAY IMAGE PHOTOGRAPHING DEVICE 失效
公开(公告)号：JP2002199388A
公开(公告)日：2002-07-12
申请号：JP2000392044
申请日：2000-12-25
申请人： CANON KK
发明人： YAMADA ETSUO
IPC分类号： H01L27/14 , H04N5/225 , H04N5/232 , H04N5/32 , H04N7/18
摘要： PROBLEM TO BE SOLVED: To improve wiring in an x-ray photographing room by drastically reducing the size of a transmission cable and to realize transmission of large capacity and a high speed at a low cost. SOLUTION: A transmission means for transmitting signals between an x-ray image photographing part and a controlling PC consists of an optical fiber cable for transmitting an optical signal electrically/optically converted from serialized image data and a metal cable for transmitting a control signal generated from an x-ray generator or the controlling PC or responded from a driving means.

3. 发明专利

JP2002191589A X-RAY IMAGE PHOTOGRAPHING UNIT 失效
公开(公告)号：JP2002191589A
公开(公告)日：2002-07-09
申请号：JP2000392043
申请日：2000-12-25
申请人： CANON KK
发明人： YAMADA ETSUO
IPC分类号： A61B6/00 , H01B11/02 , H04N5/32 , H04N7/18
摘要： PROBLEM TO BE SOLVED: To easily handle a cable in a cassette type X-ray image photographing unit by drastically reducing the thickness of the transmission cable. SOLUTION: A transmitting means for transmitting a signal between an X-ray image photographing part and a control PC consists of a high-band area optical fiber cable which transmits an optical signal obtained by electrically/ optically converting serialized image data and a low-band area optical fiber cable which transmits an optical signal obtained by serializing a control signal which is originated from the control PC or originated from a driving means by response and electrically/optically converting it.

4. 发明专利

JPH1139686A OPTICAL INFORMATION RECORDING DEVICE 失效
公开(公告)号：JPH1139686A
公开(公告)日：1999-02-12
申请号：JP19248497
申请日：1997-07-17
申请人： CANON KK
发明人： YAMADA ETSUO , NAITO YUICHI
IPC分类号： G11B7/125
摘要： PROBLEM TO BE SOLVED: To perform simultaneous verification with recording without generating a pseudo signal at the time of binarizing a verifying signal by reducing a spike noise in the verifying signal. SOLUTION: By supplying a gain changeover signal delayed by a prescribed time by means of a delay circuit 67 to a gain changeover circuit 65 removing a power modulation component due to the modulation of a recording spot by changing a gain for amplifying the output signal of a photodetector 31, a spike noise due to the delay of output of a LD driver 61 is reduced. When recording is performed by dividing one track into plural sectors, non-recording power is turned off except the objective sector to be recorded.

5. 发明专利

JPH1139685A OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH1139685A
公开(公告)日：1999-02-12
申请号：JP18819497
申请日：1997-07-14
申请人： CANON KK
发明人： KITAI HIROTO , YAMADA ETSUO , NAITO YUICHI
IPC分类号： G11B7/125
摘要： PROBLEM TO BE SOLVED: To prevent saturation in an amplifier and to prevent the leakage of a carrier to an adjacent photodetector by bypassing a feedback resistor connected between the input/output of the amplifier amplifying the output signal of the photodetector not using its signal for the period of a reproducing photodetector, or recording power. SOLUTION: A diode D1 bypasses the resistor Rf so that the photocurrent of the photodetector in the recording power at a recording time doesn't flow through the resistor Rf . By using such a diode D1 , a limit due to the diode D1 isn't applied at a reproducing time, and a regenerative signal is amplified by a gain decided with the resistor Rf . Further, the recording power at the recording time is limited by the diode D1 before arriving at a saturated voltage limited by a power source of an operational amplifier 101, and since the resistor Rf is bypassed, the saturation of the operational amplifier 101 is prevented.

6. 发明专利

JPH01189184A SEMICONDUCTOR-LASER DRIVING APPARATUS 失效
公开(公告)号：JPH01189184A
公开(公告)日：1989-07-28
申请号：JP1247288
申请日：1988-01-25
申请人： CANON KK
发明人： HIRAMATSU MAKOTO , YAMADA ETSUO
IPC分类号： H01S5/00 , G11B7/125
摘要： PURPOSE:To prevent deterioration, breakdown and the like of a semiconductor laser when laser output is stopped and on transition from stop to drive, by stopping a high frequency oscillating circuit when the laser output is stopped. CONSTITUTION:When a laser output starts emitting from a laser diode LD 2, power is supplied to a high frequency oscillating circuit 13, and high frequencies are superimposed. When the laser output becomes OFF, the supply of the power source into the oscillating circuit 13 is stopped, and the high frequencies are not superimposed. In this way, deterioration and breakdown of the semiconductor laser due to excessive current generated in the oscillating circuit, especially due to the excessive current generated on transmission from OFF state of the laser output to the ON state of the laser output, can be prevented.

7. 发明专利

JPH097190A OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH097190A
公开(公告)日：1997-01-10
申请号：JP15446995
申请日：1995-06-21
申请人： CANON KK
发明人： YAMADA ETSUO
IPC分类号： G11B5/80 , G11B7/085 , G11B7/09
摘要： PURPOSE: To prevent increase in a tracking error or a focus error arising when an ultrasonic motor, etc., are increased or decreased in speed. CONSTITUTION: This device is provided with a movable head 104 irradiating an optical card 100 with a light beam, a voice coil motor 113 moving the optical card and the movable head back and forth relatively in the direction of a track, and an ultrasonic motor 21 moving the movable head and the optical card relatively in the direction perpendicular to the track. This device is also provided with a correction signal generation means correcting a tracking error signal at the time of increasing or decreasing a speed of the voice coil motor 113 or the ultrasonic motor and a subtracter applying the correction signal to a tracking control loop. And, the tracking error is corrected by applying the correction signal to the tracking control loop in synchronism with start/stop of driving the voice coil motor 113 or the ultrasonic motor 21. A focus error signal is also corrected by applying the correction signal to the focus control loop.

8. 发明专利

JPS6437729A OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS6437729A
公开(公告)日：1989-02-08
申请号：JP19366487
申请日：1987-08-04
申请人： CANON KK
发明人： KANDA SHIGETO , KITAI HIROTO , YAMADA ETSUO
IPC分类号： G02B7/28 , G11B7/09 , G11B19/04
摘要： PURPOSE:To execute a correct and speedy servo re-lead-in by immediately switching to a position servo, holding the optical movable part of an optical head to a prescribed position stored beforehand and when a tracking abnormality or a focusing abnormality is generated, thereafter, executing an AT servo re-lead-in or an AF servo re-lead-in. CONSTITUTION:When an AT servo off-position is detected when a light beam spot is located in a track (u), first, a switching from the AT servo to the position servo is executed, an objective 26 is moved to the position at the time of a first AT servo lead-in to an optical head main body 31, and the light beam spot is moved to a track (v). Meanwhile, since an optical head 18 is not moved, the neutral position of the objective 26 remains in a position Q. Next, an optical head feeding driving motor 13 is operated, and the optical head 18 is moved by n-track as a whole. At such a time, the AT servo lead-in is executed, and the AT servo-lead-in is executed to the track (u). Thus, the correct and speedy AT servo re-lead-in to the target track can be executed.

9. 发明专利

JPH10154339A LASER DIODE DRIVING DEVICE 失效
公开(公告)号：JPH10154339A
公开(公告)日：1998-06-09
申请号：JP31210796
申请日：1996-11-22
申请人： CANON KK
发明人： YAMADA ETSUO
IPC分类号： G11B7/125
摘要： PROBLEM TO BE SOLVED: To provide the laser diode driving device in which optical output is sufficiently provided even at the leading portion of write data signals and data are accurately recorded. SOLUTION: The laser diode driving device has the means 6 to 8 which drive a laser diode 1 in accordance with the write data signals to be recorded, a photodetector 2 which detects a portion of the laser beams emitted from the diode 1 and an MPU 5 which controls the driving means so that the optical output of the diode 1 becomes a target optical output. Moreover, a means is provided to beforehand detect the control signal value for the driving means through which the optical output of the diode 1 becomes approximately equal to the target optical output and the control signal value obtained during a write operation is set as an initial value in the driving means. Then, the control of the diode 1 is started.

10. 发明专利

JPH04114328A OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH04114328A
公开(公告)日：1992-04-15
申请号：JP23316790
申请日：1990-09-05
申请人： CANON KK
发明人： YAMADA ETSUO
IPC分类号： G11B7/09 , G11B7/125 , G11B25/04
摘要： PURPOSE:To reduce the number of parts in an optical head as far as possible by switching a bias voltage to be impressed to a photoelectric converter corresponding to a recorded signal. CONSTITUTION:A semiconductor laser is built in an optical head 18, and an optical card is irradiated with this. Light power LPD of the semiconductor laser is switched to recording light power PW and reproducing light power PR corresponding to an information recording signal WD, and the optical card is irradiated with this power. On the other hand, reflected light from the optical card is photodetected by photodetectors 28-30 respectively and in this case, however, a switch element 122 is changed over at a recording level and a reproducing level. Namely, at the recording level, the switch element is changed over so as to output a forward bias voltage -Vf of a forward bias voltage generator 120 and at the reproducing level, the switch element is changed over so as to output a backward bias voltage +Vb of a backward bias voltage generator 121.

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