KR0133946B1 - Reverse rotation detector preventer of disk player - Google Patents

Abstract

The present invention relates to an apparatus for detecting a reverse driving of a disc of a disc player and an apparatus for preventing the reverse driving of a disc using the same. The disc reverse drive detection apparatus is spaced apart from one or more sensing units having a predetermined angular length on one surface of the disc stator, at least at an equal interval, at a predetermined angular interval from the first detecting unit and the first detecting unit. A second detector disposed, a deviation signal generator for generating a predetermined deviation signal due to a temporal deviation between an output signal of the first detector and an output signal of the second detector, and any one of the deviation signal and the detector output signals Comparing one includes a rotation direction discrimination unit for discriminating whether the disk rotation or not.

This makes it possible to easily and reliably discriminate the reverse running of the disc and easily prevent the reverse running of the disc based on the determination.

Description

Disc running backward detection device and back running prevention device of disc player

1 is a schematic front view showing the arrangement relationship between the disk fixing device and the FG sensor.

2 is a bottom view of the disc holder.

3 is a positional relationship diagram between a part to be detected and FG sensors.

4 is a timing relationship diagram of output signals.

5 is a block diagram of a disc reverse driving prevention circuit.

* Explanation of symbols for main parts of the drawings

1: disc stator 2: detected part

4: AND gate 5: D-latch

6 delay element 7 TBC-IC

The present invention relates to an apparatus for detecting a reverse driving of a disc of a disc player and an apparatus for preventing the reverse driving of a disc using the same.

In a conventional laser disk player or the like, a rotation speed of a disk driver is detected using an FG sensor (Frequency Generation Sensor) made of a photo interrupter or the like, and based on this, initial rotation speed control and brake operation control are performed. .

When the disc is driven for normal reproduction or the like, the drive motor gives the rotational force in the forward direction, and when the brake is applied, the reverse torque is applied to stop the rotational rotation of the disc. A system controller that receives a signal from the rotation speed detection FG sensor considers the disk to be stopped when the rotation speed of the disk falls below a certain value due to brake operation by reverse torque, that is, when the output value of the FG sensor falls below a certain value. The deck motor can be used to perform a trayout or to halt the system.

However, if for some reason, for example, the power is turned off during brake operation and then turned on again, if the brake is operated while the disk is running in reverse, the disk will be accelerated further because the disk is subject to additional reverse torque. As a result, reverse runaway may occur due to the reverse rotation.

Accordingly, it is an object of the present invention to provide a disc reverse drive detection apparatus that easily detects whether a disc is reversely rotated to prevent disc reversal.

Another object of the present invention is to provide a disk reverse drive prevention apparatus using the above-described disk reverse drive detection apparatus.

In order to achieve the above object, the disk reverse traveling detection apparatus according to the present invention, the one or more sensing parts arranged at one or equiangular intervals having a predetermined angle length on one surface of the disk stator for supporting the rotational movement of the disk, the A first detector for detecting the presence of the first detection unit, a first detection unit for detecting the presence of the sensing unit, spaced at a predetermined angular distance from the first detection unit, and detecting the presence of the unit to be detected; Deviation signal generation unit for generating a predetermined deviation signal due to the temporal deviation between the output signal of the second detection unit, a rotation direction for comparing the deviation signal and the detector output signal to determine whether or not the disk rotation is inverse It includes a discriminating unit.

In addition, the disk reverse drive prevention apparatus according to the present invention, in addition to the above-described components of the disk reverse drive detection apparatus, further includes a brake drive control unit for controlling the operation of the disc brake in accordance with the output signal of the rotation direction discrimination unit.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view schematically showing that two FG sensors S1 and S2 disposed in accordance with the present invention are disposed on the bottom surface of the disc stator 1 driven by the motor M to support the rotational movement of the disc. to be. The FG sensors S1 and S2 are made of a photo interrupter as in the prior art, and unlike the conventional one in which only one is used, two are arranged in pairs. On the bottom of the disc stator 1, as shown in FIG. 2, a large number of detected parts 2 and a space 3 are alternately arranged at equal intervals along the circumferential direction thereof. Each to-be-detected part 2 has a fixed angular length, and FG sensors S1 and S2 are provided in mutually constant angular spacing (theta) at predetermined intervals adjacent to them.

3 shows linearly the positional relationship between the FG sensors S1 and S2 of the part 2 to be detected. FIG. 3 (a) shows linearly the detected part 2 attached to the bottom of the disc stator 1. FIG. 3 (b) shows the relative positional relationship of the FG sensors S1 and S2. It is displayed. Both FG sensors S1 and S2 are within the length range of the detected part 2. From the starting point of the one detecting unit 2 to the starting point of the next one detecting unit 2, one cycle is regarded as a sinusoidal curve, and the circumferential period is viewed as 2π. For convenience of explanation, the one detecting unit ( The angular length of 2) is π, and the angular interval θ between the two FG sensors S1 and S2 is π / 2. Since the plurality of detected parts 2 are arranged in succession, the angular interval θ can have the same result even if it has any value corresponding to (π / 2 + 2πn). Further, θ may have any value within 0θπ rather than π / 2.

4 shows the timing relationship of the output signals of the FG sensors S1 and S2 that are output based on the positional relationship as shown in FIG. 3 with respect to the detected part 2. 4 (a) is a linear representation of the detected part 2, similarly to FIG. 3 (a), and FIG. 4 (b) shows a waveform of a signal output by the first FG sensor S1. (c) shows the waveform of the signal output by the second FG sensor S2.

The waveform of the second FG sensor S2 has a deviation compared to the first FG sensor S1 by a time corresponding to their separation interval θ. That is, the two signals have a phase difference corresponding to π / 2.

FIG. 5 shows a block circuit diagram for detecting disc reverse driving based on the output signal of FIGS. 4 (b) and (c) and preventing it according to the present invention.

The output signals from the first and second FG sensors S1 and S2 are both input to the AND gate 4, and the signals output therefrom have the waveform as shown in FIG. The output signal of the AND gate 4 is input to the D-latch 5 through the data input terminal of the D-latch 5. On the other hand, the output signal of the first FG sensor S1 is delayed by the delay element 6 for a predetermined time and is also input through the clock input terminal of the D-latch 5. The delayed signal entering the clock input terminal of the D-latch 5 is delayed by a predetermined delay time Td, as indicated by a dotted line in the fourth (b). In the forward rotation, the rising edge point LP1 of this delay signal becomes the latch point of the D-latch 5. In reverse rotation, the LP2 point as indicated by the second detected signal in FIG. 4 (b) becomes a latch point, of course.

In the illustrated embodiment, the delay time of the first FG sensor S1 is set within a time corresponding to 0Tdθ _t . Here, θ _t refers to the time corresponding to the phase difference θ between two detection signals, and is a value of (60 / N _max ) × (1 / F) × (1/4). In this case, N _max refers to the maximum rotational speed (rpm) of the motor, and F is the number of output signals of the first FG sensor S1 output during one rotation of the motor, which is 4 in the present embodiment. And (1/4) means the separation interval θ between the two sensors (S1 and S2).

Of course, this delay time may be set within another range. However, only the meaning of the output signal of the latch 5 is different.

Due to the above characteristics of the signal input to the D-latch 5, at the output terminal Q of the D-latch 5, a low signal is output during forward rotation and high when reverse rotation. ) Signal is output. When the high signal is output from the D-latch 5, it means that the disk is running in reverse, and this signal blocks the brake signal directed to the brake through the transistor TR1. Therefore, the brake is not applied with braking action, i.e. reverse torque. At the same time, the output signal of the D-latch 5, which means the disk running, is input to the system controller 8, and the system controller 8 receives the signal and issues a stop signal to prevent the TBC-IC 7 from operating anymore. Therefore, the TBC-IC 7 no longer emits a rotation signal.

As described above, the disk reverse driving detection apparatus and the disk reverse driving prevention apparatus according to the present invention can be easily installed by additionally adding one FG sensor, thereby making it possible to easily determine the reverse driving of the disk and to prevent the reverse driving of the disk based thereon. Provides an excellent effect.

Claims (13)

A disc player driving apparatus of a disc player, comprising: a sensing unit having one or more at equal angle intervals having a predetermined angular length on one surface of a disc stator supporting a rotational movement of the disc; A first detection part detecting a presence of the part adjacent to the detected part spaced apart; A second detection unit arranged to be spaced apart from the first detection unit at a predetermined angular interval to detect the presence of the unit to be detected; A deviation signal generator for generating a deviation signal due to a temporal deviation between the output signal of the first detector and the output signal of the second detector; And a rotation direction discrimination unit which compares any one of the deviation signal and the detector output signals to determine whether or not the disk rotation is normal or not. The apparatus of claim 1, wherein the first and second detectors comprise port interrupters. 2. The disk drive detection apparatus according to claim 1, wherein the deviation signal generation unit is an AND gate that uses output signals of the first and second detectors as input signals. 4. The disc reverse driving according to claim 3, wherein the detector output signal compared with the deviation signal in the rotation direction discriminating unit is delayed for a time less than the time interval at the disc maximum rotational speed corresponding to the length area of the detected portion. Sensing device. The apparatus of claim 4, wherein the delay time corresponds to a separation distance between the two detectors. The disk drive detection apparatus according to claim 4 or 5, wherein the rotation direction discrimination unit is a latch which receives the delayed detector output signal as a clock and simultaneously receives an output signal of the AND gate as a data signal. An apparatus for preventing the reverse drive of a disc player, comprising: at least one sensing unit having one or more equiangular intervals having a predetermined angular length on one surface of a disc stator supporting a rotational movement of the disc; A first detection part detecting a presence of the part adjacent to the detected part spaced apart; A second detection part spaced apart from the first detection part at predetermined angular intervals to detect the presence of the detected part; A deviation signal generator for generating a predetermined deviation signal due to a temporal deviation between the output signals of the first detector and the output signal of the second detector; A rotation direction discriminating unit which compares any one of the deviation signal and the detector output signals to determine whether the disk is rotated or not; And a brake driving control unit for controlling the operation of the disc brake according to the output signal of the rotation direction discriminating unit. 8. The disk drive prevention apparatus of claim 7, wherein the first and second detection units comprise a photo interrupter. 8. The apparatus as claimed in claim 7, wherein the deviation signal generator is an AND gate that uses output signals of the first and second detectors as input signals. 10. The apparatus of claim 9, wherein the detector output signal compared with the deviation signal in the rotation direction discriminating unit is delayed for less than a time interval at the disc maximum rotational speed corresponding to the length area of the detected unit. Disc reverse running prevention device. The apparatus of claim 10, wherein the delay time corresponds to a separation distance between the two detectors. The apparatus as claimed in claim 10 or 11, wherein the rotation direction discrimination unit is a latch which receives the delayed detector output signal as a clock and receives an output signal of the AND gate as a data signal. 8. The disc reverse driving prevention device according to claim 7, wherein the brake drive control unit blocks the brake drive signal when the output signal of the rotation direction discriminating unit indicates reverse rotation of the disc.