公开(公告)号：WO1992014249A1

公开(公告)日：1992-08-20

申请号：PCT/EP1992000232

申请日：1992-02-04

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B27/30

CPC classification number: G11B7/08505 ,  G11B7/005 ,  G11B19/12 ,  G11B20/1803 ,  G11B27/105 ,  G11B27/11 ,  G11B27/329 ,  G11B2220/2545 ,  G11B2220/65

Abstract: Recorded on the so-called lead-in track of a compact disc is the contents list of the disc. The data stored in the contents list are divided into several blocks. Several blocks containing the same data are recorded in series on the CD for redundancy purposes. A CD player reads the whole contents list, reading all the blocks, even the redundant ones, one after the other, by moving a scanning device along the spiral data track. In order to reduce the time taken to read the contents list, the invention calls for the scanning device, when reading the data making up the contents list, to jump one track outwards or inwards when it has read a block. This means that the scanning device no longer reads all the redundant blocks, but only a small proportion of them, thus considerably reducing the time taken to read and store the data making up the contents list.

公开(公告)号：WO1986005307A1

公开(公告)日：1986-09-12

申请号：PCT/EP1986000076

申请日：1986-02-15

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B07/095

CPC classification number: G11B21/106 ,  G11B7/08505 ,  G11B7/0953

Abstract: In order to obtain perfect scanning of audio and/or video disks through application of contactless scanning with a coarse and fine drive combination for radial servo readjustment, the fine drive optimal working point (A) is reached through a correct interaction of coarse and fine drive, even in the case of different large radial excentricity amplitudes. This is done through adjustment of the coarse drive, using a comparator (10), as a threshold value detector, and through an evaluation of the impulse sequences occurring at the comparator exit.

Abstract translation: 为了通过应用用于径向伺服重新调整的粗略和精细驱动组合的非接触式扫描来获得对音频和/或视频盘的完美扫描，通过粗略和精细驱动的正确的相互作用达到精细驱动最佳工作点（A） 即使在不同的大径向离心幅度的情况下也是如此。 这是通过使用比较器（10）作为阈值检测器，并且通过对在比较器出口处发生的脉冲序列的评估来调整粗驱动来完成的。

公开(公告)号：WO1992014248A1

公开(公告)日：1992-08-20

申请号：PCT/EP1992000240

申请日：1992-02-04

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B21/08

CPC classification number: G11B19/20 ,  G11B7/08505 ,  G11B21/083

Abstract: A method of reducing the time to access a given point on a data track on a rotating disc. When the scanning device of a reproduction device jumps rapidly over many tracks on a disc, the scanning device can jump accurately only onto a particular track, but not onto a particular point on that track. In the worst case, the disc (CD) must then carry out a whole revolution before the designated point is detected by the light beam of the scanning device. In a compact-disc player, which is a constant-linear-velocity system, this waiting time is between 120 and 330 ms. In order to reduce the access time, the invention calls for the rotational speed of the disc which is necessary for the designated point (P2) to be detected on arrival at the designed track (S2) to be calculated from the number A of tracks lying between the last track to be scanned (S1) and the designed track (S2), the angular position of the last point to be scanned (P1) on the last track scanned (S1) and the angular position of the designed point (P2) on the designed track (S2), and the length of time taken for the jump. The invention is of use in reproduction and/or recording devices in which a rotating disc is scanned by a non-contact means, such as CD players, video disc players, DRAW disc players and magneto-optical devices.

公开(公告)号：WO1992014246A1

公开(公告)日：1992-08-20

申请号：PCT/EP1992000171

申请日：1992-01-28

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B19/247

CPC classification number: G11B19/247

Abstract: In playing devices which scan a rotating disc at a constant track speed, when shifting from one track to a target track the rotation speed control circuit is broken and the speed of the disc is adjusted to the value required for the target track by a second control circuit. As soon as the scanner has reached the target track the rotation speed control circuit is made once more. In order to do away with the second control circuit, before playing the pulse width ratio of the control signal for the disc concerned is found and stored which is needed for the electric motor to spin the disc at the prescribed speed for a given track. When changing tracks, the pulse width ratio needed for the target track is calculated from the stored figure. A control signal with the calculated pulse width ratio is applied to the electric motor so that the speed of the disc is set to the value needed for the target track. As soon as the target track has been reached the speed control circuit is once more made. CD players, video disc players, DRAW disc players and magneto-optical devices.

公开(公告)号：WO1992014241A1

公开(公告)日：1992-08-20

申请号：PCT/EP1992000239

申请日：1992-02-04

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter ,  KÜHN, Hans-Robert

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B07/09

CPC classification number: G11B21/106 ,  G11B7/0948

Abstract: When data is being read off a optical disc, the light beam can lose the data track if it encounters a dirty or damaged spot on the disc. A tracking circuit steers it back on to the correct track some distance after passing the dirty or damaged spot. In order that the light beam (L) is steered back on to the correct track (B) as soon as possible after passing a dirty spot (SK), the invention calls first for the address of the point (1) at which the light beam (L) leaves the track (B) to be stored. From the control signal necessary to bring the light beam back on to the correct track, a first modified control signal is then calculated and also stored. When, during subsequent plays, the light beam (L) comes to the point (1) on the disc, now stored in the memory, the first modified control signal is fed to the tracking circuit. In order to produce an optimum modified control signal, the light beam (L) is taken several times past the point (1) stored in the memory, and each time a new modified control signal is calculated and stored. The invention is of use in CD players, video disc players, DRAW disc players and magneto-optical recording and replaying devices.

公开(公告)号：WO1987003731A1

公开(公告)日：1987-06-18

申请号：PCT/EP1986000709

申请日：1986-12-04

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B07/08

CPC classification number: G11B21/083

Abstract: A writing and/or reading head can write and/or read data on the tracks of an information support. The writing and/or reading head can be positioned over each track of the information support by means of a coarse-feed drive (S, G) and by a fine-feed drive (S, F) which is mechanically linked with the coarse-feed drive. When searching for a track, the coarse-feed drive travels fast over the tracks until it stops at the target track. The braking phase of the coarse-feed drive is kept short by a large time-log. At the latest at the beginning of the braking phase of the coarse-feed drive the regulating circuit of the fine-feed drive is disconnected. During the braking phase a control signal is applied to the fine-feed drive which clamps the mechanical oscillations of the fine-feed drive as a result of the inertial forces which arise when the coarse-feed drive is braked. Consequently, after braking of the coarse-feed drive, the regulating circuit of the fine-feed drive can again be connected. The fine-feed drive is then brought precisely over the track sought.

Abstract translation: 写入和/或读取头可以在信息支持的轨道上写入和/或读取数据。 写入和/或读取头可以通过粗饲料驱动（S，G）和通过精加工驱动（S，F）定位在信息支撑的每个轨道上，该细进给驱动器（S，F）与粗饲料驱动 进料驱动。 当搜索轨道时，粗饲料驱动器在轨道上快速行进，直到其停在目标轨道。 粗饲料驱动器的制动阶段保持较短的大时间对数。 最初在粗饲料驱动的制动阶段开始时，细饲料驱动器的调节电路断开。 在制动阶段期间，控制信号被施加到细进给驱动器，由于在粗进给驱动器被制动时产生的惯性力，夹紧精料供给驱动器的机械振荡。 因此，在粗饲料驱动的制动之后，可以再次连接细饲料驱动器的调节电路。 然后将精细送料驱动器精确地放在追求的轨道上。

公开(公告)号：WO1991018393A1

公开(公告)日：1991-11-28

申请号：PCT/EP1991000892

申请日：1991-05-14

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B21/08

CPC classification number: G11B7/0948 ,  G11B7/08505 ,  G11B7/094

Abstract: A tracking circuit is disclosed for a recording and/or playback machine that scans a recording medium without contact. The tracking circuit of a CD-player is provided for example with a coarse drive (M2, SP) on which is mounted a fine drive. In order to be able to guide the data-scanning light beam (L) along the data tracks of the disk (CD), the coarse drive (M2) is switched on from time to time. The coarse drive generates mechanical vibrations, however, which can cause track loss or even focus loss, if at the same time defects are found on the CD, for example scratches or fingerprints. In order to increase the scanning reliability, the track error signal (TE) or the focus error signal (FE) is checked for errors by a detector (H1), for example. As long as the detector (H1) indicates an error, the coarse drive (M2) remains switched off.

公开(公告)号：WO1991003048A1

公开(公告)日：1991-03-07

申请号：PCT/EP1990001188

申请日：1990-07-20

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B17/22

CPC classification number: G05B19/4015 ,  G05D3/14 ,  G11B17/228

Abstract: In order to adjust the scanning device of a positioning device, the unit to be positioned is taken manually to a given place. The sensor of the scanning device is then adjusted so that ist output signal is at its maximum. To shorten and simplify this time-consuming and laborious operation, the unit (AS) to be positioned is first taken manually to a defined initial position. The unit (AS) is then, in a second step, automatically moved to a second position until the output signal of the scanning device sensor (E) is at its maximum. The difference between the first and second positions is stored as an offset. In operation, with each positioning procedure the unit (AS) is positioned in a first step until the output signal of the sensor (E) is at its maximum. In a second step the unit (AS) is then moved further into the final position by the stored offset. Positioning device, e.g. in record changers, in order to be able to position the playing device in front of the individual compartments of a magazine in which the records are held.

Abstract translation: 为了调整定位装置的扫描装置，将要定位的装置手动地取出到给定的位置。 然后调整扫描装置的传感器，使得输出信号处于其最大值。 为了缩短和简化这个耗时且费力的操作，首先将定位的单元（AS）手动地移动到定义的初始位置。 然后，单元（AS）在第二步骤中自动移动到第二位置，直到扫描装置传感器（E）的输出信号处于其最大值。 第一和第二位置之间的差值被存储为偏移量。 在操作中，通过每个定位程序，单元（AS）位于第一步，直到传感器（E）的输出信号处于其最大值。 在第二步中，单元（AS）然后通过存储的偏移进一步移动到最终位置。 定位装置，例如 在记录转换器中，以便能够将播放设备定位在保存记录的杂志的各个隔间的前面。

公开(公告)号：WO1986005306A1

公开(公告)日：1986-09-12

申请号：PCT/DE1986000065

申请日：1986-02-21

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter ,  FÜLDNER, Friedrich ,  KURZ, Arthur

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B07/085

CPC classification number: G11B7/0945 ,  G11B7/08511 ,  G11B7/0909 ,  G11B7/094

Abstract: The light beam is focussed with the aid of an optical system on to an optical recording medium. The optical system consists of a light source and a movable lens (20) which can be moved by means of servo-element (SG). The recording medium reflects the light beam on to a number of photoelectric cells (A, B, C and D). From their output voltages an initial control voltage is obtained by subtraction and addition of the differences thus obtained, and this is transferred by a servo-amplifier (RV) to the servo-element (SG) so that a closed loop system is formed. When the closed loop system is opened a second control voltage Us is fed to the servo-element (SG) and is modified. If the light beam is focussed on to the recording medium, the control loop system is again closed. The value of the second control voltage Us received at that moment is maintained and is available at the servo-element (SG) as a pre-voltage.

Abstract translation: 在焦点到达之后，调节电路闭合，并且在焦点处检测到的脉冲调制值被存储。 由脉冲调制电压产生的控制电压（Us）用作致动器（4）的偏移电压。 控制电压（Us）由交流分量叠加。

公开(公告)号：WO1993001596A1

公开(公告)日：1993-01-21

申请号：PCT/EP1991001236

申请日：1991-07-02

Applicant: DEUTSCHE THOMSON-BRANDT GMBH ,  BAAS, Dieter

Inventor： DEUTSCHE THOMSON-BRANDT GMBH

IPC: G11B27/10

CPC classification number: G11B27/105 ,  G11B7/08505 ,  G11B11/10563 ,  G11B11/10595 ,  G11B21/083 ,  G11B2020/10768 ,  G11B2220/2529 ,  G11B2220/2545

Abstract: If a CD listener wishes to hear a given piece of music on a CD, he must wait for the "access time" taken by the scanning device to find the desired piece of music before it can start to play it. In order substantially to reduce the access time in a recording and/or playback device with a recording substrate on which the data are distributed in groups, after the data substrate (CD) has been inserted the first n data of a given group are first placed in a store (S). If the data of a given group are to be read, the data of this groups placed in the store (S) are first read out. Meanwhile the scanning device (A) of the instrument has enough time to seek the group. Once the scanning device (A) has found the group and the data flow from the store (S) is synchronised with that from the scanning device (A), the data supplied by the scanning device are read out. This reduces the access time to almost zero. CD players, video disc players, DRAW disc players and magneto-optical devices.

Abstract translation: 如果CD听众希望在CD上听到一段给定的音乐，那么他必须等待扫描设备拍摄的“访问时间”，才能开始播放所需的音乐片段。 为了基本上减少具有数据分组的记录基板的记录和/或播放装置的访问时间，在数据基板（CD）已被插入之后，首先放置给定组的前n个数据 在商店（S）。 如果要读取给定组的数据，则首先读出放置在商店（S）中的该组的数据。 同时，仪器的扫描装置（A）有足够的时间寻找组。 一旦扫描装置（A）已经找到该组并且来自存储器（S）的数据流与来自扫描装置（A）的数据流同步，则读出由扫描装置提供的数据。 这将访问时间减少到几乎为零。 CD播放器，视频盘播放器，DRAW盘播放器和磁光设备。