JPS6233364A - Information reproducing device - Google Patents

Abstract

PURPOSE:To improve the operability of the titled device by braking the rotation of a recording disc in response to an external mode command and inhibiting the control of the recording disc by means of a drive means after the rotation is stopped. CONSTITUTION:Which of a CD mode command signal and a LDD mode command signal is led to a moving contact of a changeover switch 4 is detected to discriminate whether or not the present mode is the CD mode and whether or not the rotation of a CD is stopped. Only when the present mode is the CD mode and the CD is rotated, a drive signal reversing a spindle motor 8 is outputted from a servo control circuit 6 and a command outputting a drive signal not causing a torque to the spindle motor when the drive speed of the spindle motor is a prescribed speed or below is fed to the servo control circuit 6. Since the control of the recording disc by the drive means is inhibited after the rotation is stopped in this way, the operability is improved.

Description

TECHNICAL FIELD The present invention relates to an information reproducing apparatus, and more particularly to an information reproducing apparatus for reproducing digitally recorded audio information.

A device for reproducing digitally recorded audio information, such as a digital audio disc player, is capable of reproducing audio information in an RF multiplied signal output from another information reproducing device. A device as shown has already been devised. In FIG. 3, for example, BFM is obtained from a digital audio disc (hereinafter referred to as CD) 2 by a pickup 1.
(Eight to Fourteen Modulat
ion) signal is applied to one input terminal of the switch circuit 3. The other input terminal of the switch circuit 3 is supplied with an F signal obtained by an information reproducing device (not shown) such as a video disc player through an input terminal IN.

These R and F signals are recorded using a method in which, for example, a pulse train signal obtained by digitizing an audio signal using the EFM method is superimposed on each FM modulated signal of a video signal and an audio signal (Japanese Patent Application No. 58-45780). This is a signal read from a video disc (hereinafter referred to as LDD) by a computer (see the book).

A signal derived from a movable contact of a changeover switch 4 is supplied to the switch circuit 3 as a control input. Switch circuit 3 selects pickup 1 depending on the level of this control input.
The configuration is such that one of the output of the input terminal IN and the signal input via the input terminal IN is selectively outputted. The output of this switch circuit 3 is supplied to a decoder circuit 5. The decoder circuit 5 is configured to decode a signal encoded by the EFM method to reproduce the original code, and at the same time detect a frame synchronization signal and output a reproduction synchronization signal. The audio signal and reproduction synchronization signal output from the decoder circuit 5 are supplied to an output terminal OUT and a servo control circuit 6, respectively. The servo control circuit 6 generates a drive signal according to the phase difference between a reference synchronization signal generated at a predetermined frequency and a reproduction synchronization signal, and at the same time controls the focus actuator, the tracking actuator, and the slider supporting the pickup 1 in the pickup 1. CD at the information detection point of pickup 1 by driving the transport motor
The configuration is such that the position on the Z axis is controlled. The drive signal outputted from the servo control circuit 6 is supplied to the spindle motor 8 via the switch circuit 7, and the relative moving speed of the information detection point of the big up point in the same station direction of the CD 2 is kept constant at the linear velocity. It is controlled so that A signal derived from the movable contact of the changeover switch 4 is supplied to the switch circuit 7 as a control input. The switch circuit 7 is
It is configured to be in one of the off state and the off state depending on the level of the control input.

For example, power is supplied to one fixed contact of the changeover switch 4, and the other fixed contact is grounded, for example. When the movable contact of this changeover switch 4 contacts one of the fixed contacts, the υ high level signal is set to CD mode (internal mode).
When the movable contact of the changeover switch 4 comes into contact with the other fixed contact, a low-level signal υ is guided to the movable contact as a command signal for LDD mode (external mode). The signal led to the movable contact of the changeover switch 4 becomes a control input to the switch circuit 3.7 and is simultaneously supplied to the microcomputer 9. The microcomputer 9 detects the states of the decoder circuit 5 and the servo control circuit 6 and issues various commands in accordance with the signals output to the movable contacts of the changeover switch 4 and the user's operations on the operating section (not shown). It is composed of

In the above configuration, when a high level CD mode command signal is derived to the movable contact of the changeover switch 4, that is, when the control inputs of the switch circuits 3 and 7 become high level, the switch circuit 3 outputs the output of the pickup 1. is selectively output and the switch circuit 7 is turned on, the audio information recorded on the CD 2 is reproduced in the CD mode. In addition, when in the LDD mode, that is, when a low-level LDD mode command signal is derived to the movable contact of the changeover switch 4, the input terminal I
If the signal supplied from the outside via N is selectively output and the switch circuit 7 is turned off, L
In the DD mode, audio information recorded on the LDD is played back.

However, in the conventional information reproducing device as described above,
When the selector switch 4 is switched while the CD 2 is being played, the switch circuit 7 is turned off almost instantaneously, and the servo control circuit 6 is prohibited from controlling the rotation of the CD 2. In this case, the CD 2 will continue to rotate for a long time due to inertia. For this reason, the conventional information reproducing apparatus has a disadvantage in that it is not possible to remove the CD even after the CD has stopped playing, resulting in poor operability.

An object of the present invention is to provide an information reproducing device that can stop the rotation of a recording disk in a short time when an external mode is commanded during a reproducing operation in an internal mode, thereby improving operability. .

The information reproducing apparatus according to the present invention is configured to brake the rotation of the recording disk in response to an external mode command, and after the rotation has stopped, control of the recording disk by the driving means is prohibited.

EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to FIGS. 1 and 2.

In FIG. 1, pickup 1. CD2. Switch circuits 3, 7. Changeover switch 4. Decoder circuit 5. Servo control circuit6. A spindle motor 8° and a microcomputer 9 are connected in the same manner as in the apparatus shown in FIG. However, in this example, the signal derived to the movable contact of the changeover switch 4 is supplied only to the microcomputer 9. Further, the control input supplied to the switch circuit 3.7 is also output from the microcomputer 9. In this microcomputer 9, the following control is performed by a processor operating according to a program stored in advance in R and OM. That is, first, it is detected which of the CD mode command signal and the LDD mode command signal is output to the movable contact of the changeover switch 4 (step 81 in FIG. 2). When the LDD mode command signal is derived, it is determined whether the current mode is the CD mode or not, and whether or not the rotation of the CD is stopped (steps S2 and S3 in FIG. 2). Only when the current mode is the CD mode and the CD is rotating, the servo control circuit 6 outputs a drive signal that causes the spindle motor 8 to rotate in the reverse direction, and instructs the servo control circuit 6 to apply the brake. Emitted (Step 84 in Figure 2)
. Next, when the rotational speed of the spindle motor becomes less than a predetermined speed, the servo control circuit 6 issues a command to output a drive signal such that no rotational driving force is generated in the spindle motor.
(Steps S5 and S61 in Figure 2)
A command to stop driving the tracking actuator, focus actuator, and slider motor is supplied to the servo control circuit 6 (step 87 in FIG. 2). Next, the level of the control input changes so that the signal supplied from the switch circuit 3 to the input terminal IN is selectively output and the switch circuit 7 is turned off (FIG. 2 SS).
Next, only when the LDD mode is set from the CD mode for the first time, each part in the decoder circuit 5 performs "initial settings for reproducing information read from the LDD (second
Figure step 89.810).

If the LDD mode command signal is being output to the movable contact of the changeover switch 4 and the mode is not in the CD mode or the CD is not rotating, steps 84 to S8 are not performed.
Only steps 88, 89 and 810 are processed.

When the CD mode command signal is output to the movable contact of the changeover switch 4, the level of the control input is set such that the output of the pickup 1 is selectively output from the switch circuit 3 and the switch circuit 7 is turned on. changes (step 511 in FIG. 2).

Next, only when the previous mode is the LDD mode, initial settings for reproducing information read from the CD are made in each part of the decoder circuit 5 (step 81 in FIG. 2).
2.813).

Effects of the Invention As detailed above, the information reproducing apparatus according to the present invention is configured to brake the rotation of the recording disk in response to an external mode command, and then prohibit the drive means from controlling the recording disk after the rotation has stopped. Therefore, even if there is a mechanism that prevents the recording disk from being removed while the recording disk is rotating to prevent scratches on the recording disk, it will not work for a short time when an external mode command is issued. The rotation of the recording disk is stopped and the recording disk can be taken out at 9, thereby improving operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the device shown in FIG. 1, and FIG. 3 is a block diagram showing a conventional information reproducing device. Explanation of symbols of main parts

Claims (1)

[Claims] a driving means for rotationally driving a recording disk to control a relative moving speed of an information detection point of a pickup with respect to the recording disk; and predetermined information read from the recording disk by the pickup and encoded by a predetermined digital modulation method. and a decoding means for decoding the
An information reproducing device configured to supply predetermined information from the outside to the decoding means in response to an external mode command, and to prohibit rotation control of the recording disk by the driving means, the information reproducing device comprising: Information reproduction characterized in that it includes a command generating means for issuing a command to brake the rotation of the recording disk and, after the rotation of the recording disk has stopped, for issuing a command for prohibiting the control of the recording disk by the driving means. Device.