公开(公告)号：JP2006238293A

公开(公告)日：2006-09-07

申请号：JP2005052990

申请日：2005-02-28

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： MORISHIMA MORIHITO

IPC: H03F3/217

Abstract: PROBLEM TO BE SOLVED: To provide a class-d amplifier which is capable of performing volume processing or feedback processing without performing analog conversion or multi-bit digital signal conversion upon a ΔΣ modulated bit stream.
SOLUTION: A data converting circuit 1 converts an "H" level of a ΔΣ modulated bit stream into data "+1" and converts an "L" level into data "-1". A multiplier 3 multiplies an output of the data converting circuit 1 by a volume value. A PLL 4 generates a clock pulse of multiplication of a clock pulse of the bit stream and outputs the clock pulse to a PWM (pulse width modulation) circuit 2. The PWM circuit 2 converts the output of the multiplier 3 into a PWM signal based on the clock pulse outputted from the PLL 4 and supplies the PWM signal to a load 6 via an output buffer amplifier 5.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供能够进行体积处理或反馈处理而不在ΔΣ调制比特流上进行模拟转换或多位数字信号转换的D类放大器。 解决方案：数据转换电路1将ΔΣ调制比特流的“H”电平转换为数据“+1”，并将“L”电平转换为数据“-1”。 乘法器3将数据转换电路1的输出乘以体积值。 PLL 4产生乘以比特流的时钟脉冲的时钟脉冲，并将时钟脉冲输出到PWM（脉冲宽度调制）电路2. PWM电路2将乘法器3的输出转换为基于 从PLL4输出的时钟脉冲，并通过输出缓冲放大器5将PWM信号提供给负载6.版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2006155897A

公开(公告)日：2006-06-15

申请号：JP2006075428

申请日：2006-03-17

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： MORISHIMA MORIHITO

IPC: G11B7/095 ,  G11B7/0045 ,  G11B7/005

Abstract: PROBLEM TO BE SOLVED: To perform more accurate focus control even when an area where reflected light on an optical disk cannot be sufficiently obtained is irradiated with a laser beam. SOLUTION: An optical disk recorder/player performs processing that decides focus control contents prior to recording or the like when recording and reproduction is performed by irradiating an area having small reflectance with the laser beam (a step Sa7). In focus control contents decision processing, an area (for example, innermost circumferential area) having large reflectance in the optical disk is irradiated with a test laser beam, and focus control contents are decided on the basis of focus control contents executed at that time and stored in a memory. when the area having small reflectance is irradiated with the laser beam, focus control is performed according to the focus control contents stored in the memory. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：即使当不能充分获得光盘上的反射光的区域时，也可以用激光束照射更精确的聚焦控制。 解决方案：光盘记录器/播放器执行通过用激光束照射具有小反射率的区域进行记录再现时在记录之前等等的焦点控制内容的处理（步骤Sa7）。 在聚焦控制内容决定处理中，用测试激光束照射在光盘中具有大反射率的区域（例如，最内圆周区域），并且基于当时执行的聚焦控制内容来确定聚焦控制内容， 存储在内存中。 当用激光束照射具有小反射率的区域时，根据存储在存储器中的聚焦控制内容进行聚焦控制。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2005341550A

公开(公告)日：2005-12-08

申请号：JP2005127648

申请日：2005-04-26

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： MORISHIMA MORIHITO

IPC: H03F1/32 ,  H03F3/217 ,  H03F3/38 ,  H03K5/13 ,  H03K5/131 ,  H03K7/08

CPC classification number: H03F3/217 ,  H03F1/3247 ,  H03F3/38 ,  H03F2200/331

Abstract: PROBLEM TO BE SOLVED: To provide a class-D amplifier which can reduce distortions by digital processing, without using ADC.
SOLUTION: A PWM circuit 3 converts output data of a calculator 2 into a pulse width modulated signal, and outputs it to a load (speaker) 6 via a buffer amplifier 4 and a low-pass filter 5. A digital low-pass filter 7 has the same filter characteristics as those of the low-pass filter 5. An error calculator 8 calculates an error Δ(z) between the input data and the output of the filter 7, and outputs it to the calculator 2. The output of the filter 7 becomes a digital signal, having substantially the same waveform as that of an analog signal applied to the load 6, and also no distortion is contained in the digital signal. Accordingly, the output data Δ(z) of the error calculator 8 becomes the data, corresponding to the distortion of the output signal, and in the calculator 2, the data Δ(z) is subtracted from the input data, and the subtraction result is applied to the PWM circuit 3, to reduce the distortions.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种可以在不使用ADC的情况下通过数字处理减少失真的D类放大器。 解决方案：PWM电路3将计算器2的输出数据转换为脉冲宽度调制信号，经由缓冲放大器4和低通滤波器5将其输出到负载（扬声器）6。 滤波器7具有与低通滤波器5相同的滤波器特性。误差计算器8计算输入数据和滤波器7的输出之间的误差Δ（z），并将其输出到计算器2。 滤波器7的输出变为具有与施加到负载6的模拟信号基本相同的波形的数字信号，并且也不会在数字信号中包含失真。 因此，误差计算器8的输出数据Δ（z）成为与输出信号的失真对应的数据，在运算器2中，从输入数据中减去数据Δ（z），减法结果 被施加到PWM电路3，以减少失真。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2005182859A

公开(公告)日：2005-07-07

申请号：JP2003417988

申请日：2003-12-16

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： NAGANO HISASHI ,  MORISHIMA MORIHITO

IPC: G11B23/40 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/24 ,  G11B20/12 ,  G11B23/38 ,  G11B27/034 ,  G11B27/10 ,  G11B27/32 ,  H04H1/00 ,  H04H60/27 ,  H04N5/76 ,  H04N5/765 ,  H04N5/781 ,  H04N5/85 ,  H04N5/92

CPC classification number: H04N5/76 ,  G11B7/0037 ,  G11B27/034 ,  G11B27/105 ,  G11B27/329 ,  G11B2220/218 ,  G11B2220/257 ,  H04H60/27 ,  H04N5/765 ,  H04N5/781 ,  H04N5/85 ,  H04N5/9201

Abstract: PROBLEM TO BE SOLVED: To provide an optical disk recording device capable of performing play back of an optical disk without any problem even if a title and a content of a program image/sound-recorded in the optical disk are displayed on the optical disk. SOLUTION: A DVD recorder 1 acquires content information of a broadcasting program to be recorded in the optical disk from any of electronic program guide information (EPG) sent together with a broadcasting wave, a program information providing site provided via the Internet, or content information of a program recorded together with program data in the optical disk. The DVD recorder 1 forms a visible image displaying content information of the program whose image is recorded in an optical disk (DVD+R5) by a process for irradiating a data recording surface of the optical disk with a laser beam to form marks and spaces on a data recording surface of the optical disk. The DVD recorder 1 prints the content information of the program on a label surface of the optical disk by a label writer 21. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：为了提供一种能够无问题地执行光盘的回放的光盘记录装置，即使标题和节目图像的内容/记录在光盘中的内容被显示在 光盘。 解决方案：DVD记录器1从与广播波一起发送的电子节目指南信息（EPG），经由因特网提供的节目信息提供站点获取要记录在光盘中的广播节目的内容信息， 或与光盘中的节目数据一起记录的节目的内容信息。 DVD记录器1通过用激光束照射光盘的数据记录表面的处理形成显示其图像被记录在光盘（DVD + R5）中的程序的内容信息的可见图像，以形成标记和空格 光盘的数据记录表面。 DVD记录器1由标签写入器21在光盘的标签表面上打印程序的内容信息。（C）2005年，JPO和NCIPI

公开(公告)号：JP2004213802A

公开(公告)日：2004-07-29

申请号：JP2003001337

申请日：2003-01-07

Applicant: Mitsubishi Chemicals Corp ,  Yamaha Corp ,  ヤマハ株式会社 ,  三菱化学株式会社

Inventor： MORISHIMA MORIHITO ,  MATSUISHI FUJIO ,  SHIMIZU KANJI

IPC: G11B7/24 ,  G11B7/0045

Abstract: PROBLEM TO BE SOLVED: To shorten a period of time required to form an image on an optical disk 200. SOLUTION: A laser array that emits three laser beams is used, and condensing points S1m, S2m and S3m of the laser beams are arranged so as to be in a radial direction of the optical disk 200. The optical disk 200 is subjected to main scanning for one line by the irradiation of the laser beams when rotated, and meanwhile, the optical disk 200 is subjected to sub-scanning by moving the irradiation point of the laser beams only for one line from an inner circumferential side to an outer circumferential side each time dots for one line are formed. In such a case, tracking is operated such that the tracks of the condensing points S1m, S2m and S3m are not overlapped between the first main scanning (1) and the second main scanning for one line. When the laser beams are emitted in accordance with dot data at the time of such main scanning to form a color changing area, an image with a high contrast ratio is formed in a short period of time. COPYRIGHT: (C)2004,JPO&NCIPI

公开(公告)号：JP2004213795A

公开(公告)日：2004-07-29

申请号：JP2003001116

申请日：2003-01-07

Applicant: Mitsubishi Chemicals Corp ,  Yamaha Corp ,  ヤマハ株式会社 ,  三菱化学株式会社

Inventor： MORISHIMA MORIHITO ,  MATSUISHI FUJIO ,  SHIMIZU KANJI

IPC: G11B7/24 ,  G11B7/0045

Abstract: PROBLEM TO BE SOLVED: To provide an optical disk in which an image can be easily formed on a label surface of the optical disk without performing complicated control and to provide an optical disk device. SOLUTION: This optical disk is provided with a foam layer including foam materials that foam when the foam materials are irradiated with laser beams from the label surface side. Since a foamed body is created by emitting laser beams from the label surface side to change refractive indexes of light made incident from the label surface side or to cause the light to make irregular reflection, this part looks cloudy to human's eyes to produce a difference in brightness and darkness from other parts that are not irradiated with the laser beams. Then, it is possible to form an image such as a desired character and pattern and form an image for easily discriminating data contents recorded on the recording surface of the optical disk. In addition, by providing a protective layer which protects the foam layer from the outside and is deformed when the foam layer foams, irregularities can be made on the label surface when the laser beams are emitted to form Braille points and three-dimensional characters and drawing. COPYRIGHT: (C)2004,JPO&NCIPI

公开(公告)号：JP2004030832A

公开(公告)日：2004-01-29

申请号：JP2002188168

申请日：2002-06-27

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： MORISHIMA MORIHITO

IPC: G11B7/0045 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/09

CPC classification number: G11B7/0037

Abstract: PROBLEM TO BE SOLVED: To provide an optical disk recording device capable of preventing data from being recorded discretely, even when a focus servo is deviated, and also to provide its control method.
SOLUTION: A control section 130 distinguishes whether the focus servo is deviated on the basis of the output signal of a servo circuit 107. When it is detected that the focus servo is deviated, the control section 130 acquires the irradiation position of a laser beam at the time of being deviated in the focus servo as a reference position, controls a laser power control circuit 140 so as to temporarily interrupt the laser power control on the basis of the data for recording, and then controls the position of an optical pickup 103 and the laser power control circuit 140 so as to resume the laser power control on the basis of the data for recording by using the reference position as a resuming position.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2004005848A

公开(公告)日：2004-01-08

申请号：JP2002160486

申请日：2002-05-31

Applicant: YAMAHA CORP

Inventor： MORISHIMA MORIHITO

IPC: G11B7/0045 ,  G11B7/0037 ,  G11B7/095 ,  G11B23/40

Abstract: PROBLEM TO BE SOLVED: To add a function forming an image on a label face of an optical disk 200. SOLUTION: This device is provided with a spindle motor 130 rotating an optical disk 200 having a heat sensitive layer, an optical pickup 100 which can irradiate the heat sensitive layer with a laser beam and can be shifted roughly in the direction of a diameter of the optical disk 200, a stepping motor 140 shifting the optical pickup 100 in the direction of a diameter by a distance corresponding to pitch of direction of the diameter out of dot arrangement to be formed for each of a plurality of times of rotation, a tracking actuator operating a position of the laser beam emitted from the optical pickup 100, a servo circuit 138 controlling the tracking actuator so that irradiation locus of the laser beam are different for each rotation when the rotation is performed the plurality of times, and a data convertor 160 prescribing intensity of the laser beam conforming to gradation of dots to be arranged and the number of times of rotation. COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2003242750A

公开(公告)日：2003-08-29

申请号：JP2002038919

申请日：2002-02-15

Applicant: YAMAHA CORP

Inventor： MORISHIMA MORIHITO

IPC: G11B23/40 ,  G11B7/24 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To produce a label surface or the like which can be adhered on a label surface of a general optical disk and on which a visible image is formed by using an optical disk apparatus which performs information recording or reproducing onto a recording surface without preparing a new printer or the like in addition. SOLUTION: This disk D has the same outside dimension as a usual CD-R or the like and has a lamination structure constituted of a substrate layer 101, a substrate layer 102, a thermosensitive layer 103, a reflecting layer 104, a protective layer 105 and a protective layer 106. Since the substrate layer 101 and the substrate layer 102 are stuck together by an adhesive surface and the protective layer 105 and the protective layer 106 are stuck together by an adhesive surface, a user can separate the disk D to three layers by releasing sticking state against adhesive force of these adhesive surfaces. Then a layer member including the thermosensitive layer 103 in which the visible image or the like is formed with laser beam irradiation, can be stuck on another position. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2002230814A

公开(公告)日：2002-08-16

申请号：JP2001022121

申请日：2001-01-30

Applicant: YAMAHA CORP

Inventor： SUZUKI YOSHIAKI ,  MORISHIMA MORIHITO ,  SAITO MINORU ,  HONDA KAZUHIKO

IPC: G11B20/14 ,  G11B7/004 ,  G11B7/125 ,  G11B7/13

Abstract: PROBLEM TO BE SOLVED: To avoid variation of a quality level of a recording signal in a recording mode, and to eliminate the influence of a jitter in both of a recording mode and a playback mode. SOLUTION: In the playback mode, a playback clock RCK is extracted from a light-receiving signal, and a high frequency superpose signal synchronized with the playback clock RCK is generated. The high frequency superposed signal is superposed on a laser driving signal to playback data. In the recording mode, a high frequency superposed signal synchronized with a record clock WCK is generated, and superimposed at least on the playback level period of the laser driving signal.