JPH04271063A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To know the set time of a disk by producing a warning if an unloaded state or a reproduction mode of the disk is detected at the set time. CONSTITUTION:A timer mode is selected with operation of a key of a key operating part 10 end then a desired time or period is set. Thus the corresponding signal is supplied to a CPU 9 and the timer mode is set based on this signal. At the same time, the date on the desired time or period are stored in an internal memory (not shown in the diagram) of the CPU 9. Under such conditions, the CPU 9 supplies a display signal corresponding to the key operation to a display part 11 and the prescribed display is carried out. Then the CPU 9 starts the measurement of time and searches a focus at the set time to decide the presence or absence of a loaded disk 1. Based on this searching result, the CPU 9 decides whether an optical disk 1 is kept in a reproduction mode or not and whether the disk 1 is loaded or not. Then a warning tone is produced by a buzzer 14 under the due conditions.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] This invention relates to a disc playback device,
In particular, the present invention relates to a disc playback device that plays back optical discs.

0002

2. Description of the Related Art Conventional disk playback devices, such as CD
Some players have a so-called timer function. This timer function starts playing the loaded disc when a preset time or time arrives. As an example of using this timer function,
It may be used in place of an alarm clock. In other words,
A wake-up time is set in the CD player, and when the wake-up time arrives, playback of the disc that has been installed in advance is started.

0003

[Problem to be solved by the invention] In the above-mentioned prior art,
The problem is that if the disc is not inserted or the disc has already been played at the preset time and/or time, the set timer function will be invalidated and the timer will no longer work. was there.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a disc playback device that enables the timer function to be effective even when a disc is not loaded or when a disc is being played.

[0005]

[Means for Solving the Problems] In the present invention, in a disc playback device equipped with a timer function, if a disc is not loaded at a set time and/or time, or when a disc is not inserted at a set time and/or time, The system is configured to issue a warning if a disc is being played.

[0006]

[Operation] A warning is issued when it is detected that the disc is not loaded or that the disc is being played back at the set time and/or time. In other words, the time when the warning is issued is the time and/or time set in the timer, so the timer function can be enabled.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment, a CD player will be described as an example of a disc playback device. In this first embodiment, the presence or absence of the optical disc 1 is detected by controlling a focus actuator in the optical pickup 4 to perform a focus search operation. In the configuration shown in FIG. 1, a reproduced RF signal is extracted from an optical pickup 4 that forms a light spot 3 on the surface 2 of the optical disc 1. This reproduced RF signal is supplied to the signal processing circuit 6.

The optical pickup 4 has a laser light source, a collimator lens, a beam splitter, an objective lens, various optical sensors, etc. inside something not shown. The optical disc 1 is moved by a guide shaft (not shown).
It is designed to be able to move in the radial direction.

In the signal processing circuit 6, servo control signals such as a focus error signal, a tracking error signal, and a thread error signal are formed from the reproduced RF signal, and these servo control signals are supplied to a servo circuit 7. .

Further, in the signal processing circuit 6, the reproduced RF signal is waveform-shaped into a binary signal, and this binary signal is demodulated to reproduce a digital signal. Audio data, subcode data, etc. are extracted from this digital signal. Audio data is taken out from terminal 8, and subcode data and other data are supplied to CPU 9. Then, in the signal processing circuit 6, an FOK signal and an FCZ signal used in a focus search operation, which will be described later, are formed from the reproduced RF signal, and the FOK signal and FCZ signal are sent to the CPU.
9. Note that the FOK signal and the FCZ signal may be replaced by forming corresponding signals, respectively.

In the servo circuit 7, a drive control signal for performing servo control such as focus servo tracking servo, thread servo, etc. is formed based on the above-mentioned servo control signal, and this drive control signal is sent to the driver circuit 12.
supplied to

The driver circuit 12 performs various servo controls such as focus servo, tracking servo, and thread servo for the optical pickup 4 based on the above-mentioned drive control signal.

Therefore, during normal playback of the optical disc 1, servo control is performed on the optical pickup 4 by a servo loop consisting of the optical pickup 4, the signal processing circuit 6, the servo circuit 7, and the driver circuit 12.

The driver circuit 12 also controls the drive of the focus actuator in the optical pickup 4 based on the control signal from the CPU 9 during a focus search operation to detect whether or not the optical disk 1 is mounted. I do.

The CPU 9 includes a key operation section 10 and a display section 1.
1. A buzzer 14 etc. is connected. The CPU 9 extracts absolute time information data (hereinafter simply referred to as time data) from the subcode data, and determines the playback position on the optical disc 1 based on this time data.

In the CPU 9, when a key of the key operation section 10 is operated, a signal corresponding to the key is outputted to the CPU 9, so that the signal is taken in.

In response to the above-mentioned key operations or when a predetermined condition is detected, the CPU 9 supplies a corresponding display signal to the display section 11, and a predetermined display is made on the display section 11.

For example, when the timer mode is selected by operating a key on the key operation section 10 and then a desired time or time is set, a corresponding signal is sent to the CPU 9.
Therefore, the timer mode is set in the CPU 9 based on the above-mentioned signal, and the above-mentioned desired time or time data is stored in a memory (not shown) inside the CPU 9. At this time, the CPU 9 supplies a display signal corresponding to the above-mentioned key operation to the display section 11.
A predetermined display is made at 1.

Thereafter, the CPU 9 starts time measurement. Then, when the measured time value reaches a preset time and/or time, the CPU 9 activates each circuit block to perform a focus search operation to determine whether or not the optical disk 1 is attached. Control. C.P.
At U9, a signal for performing a focus search operation is supplied to the servo circuit 7. When a signal for performing this focus search operation is supplied to the servo circuit 7, the servo loop is cut off, and the focus actuator of the optical pickup 4 is driven and controlled by the driver circuit 12, whereby a predetermined focus is set. A search operation is performed.

Based on the results of this focus search operation, the CPU 9 determines whether or not the optical disc 1 is being played back, and whether or not the optical disc 1 is loaded. If any of the conditions is met, a control signal is supplied from the CPU 9 to the buzzer 14, and the buzzer 14 emits a warning sound.

The circuit operation of one embodiment will be explained below with reference to FIG.
This will be explained with reference to the flowchart. Step 101
The mode and time settings are made in . As described above, the timer mode is selected by key operations on the key operation unit 10, and then a desired time and/or time is set. When this mode setting and a signal corresponding to the set time and/or time are supplied to the CPU 9, the CPU 9 sets the timer mode based on the above-mentioned signal, and also sets the set time and/or time. It is stored in a memory (not shown) inside the CPU 9. At the same time, the CPU 9 starts time measurement. After this, the process proceeds to step 102.

At step 102, it is determined whether the measured time value has reached a preset time and/or time. Proceed to step 103 only if the time value reaches the set time and/or time. At step 103, it is determined whether or not playback is in progress. If it is determined that the playback is in progress, step 111
In step 111, the buzzer 14 generates a warning sound. If it is determined that the playback is not in progress, the process proceeds to step 104.

In the flow after step 104, it is determined whether or not the optical disk 1 is mounted by a focus search operation. This focus search operation is an operation in which the focus servo loop is turned off, the focus actuator is moved, a window signal is opened with the FOK signal, and the FCZ signal is detected within the range of this window signal. With this focus search operation, FC
When the Z signal is detected, it is assumed that the optical pickup 4 has entered the control range of the focus servo, and the focus servo loop is closed.

At step 104, after the focus actuator is lowered to the initial value position, the focus actuator is raised from the initial value position. Then, the process proceeds to step 105.

At step 105, while raising the focus actuator, it is determined whether the FOK signal is detected at a high level. This FOK signal is
This is a window signal for detecting a focus error signal, and the FOK signal is output at a high level, for example, when the addition signal of the 4-division photodetector exceeds a predetermined value.

The total sum of reflected light from the optical disk 1 increases as it approaches the focus position. Therefore, when the focus position is far from the focus position, the addition signal of the 4-division photodetector is less than a predetermined value, and no FOK signal is output. When the focus position is approached, the addition signal of the 4-division photodetector exceeds a predetermined value, and the FOK signal is outputted, for example, at a high level. If the FOK signal is output at high level, proceed to step 106;
If the FOK signal is not output at high level, the process advances to step 109.

In step 109, the high level FO
This is a state in which the K signal is not detected, and in this case it is determined whether the focus actuator has risen to the final position. If the focus actuator has not been raised to the final position, the process returns to step 105 to continue detecting the FOK signal, and if the focus actuator has been raised to the final position, the process proceeds to step 110.

In step 106, the high level FO
This is the case where the K signal is detected, and this step 106
Then, the FCZ signal is further detected. This FCZ signal is a signal indicating the zero crossing of the focus error signal, and the timing at which the FCZ signal is output corresponds to the focus position. When the FCZ signal is detected, the focus search operation is ended and the focus servo loop is closed. Then, the process proceeds to step 107 only when the FCZ signal is detected.

In steps 107 and 108, the timer mode is selected, the time and/or time preset in the timer has been reached, and the optical disc 1 is attached, so the optical A playback operation for disk 1 is performed. That is, step 107
Then, the focus servo loop is closed and focus servo control is performed, and in step 108, the optical disc 1 is played back.

In step 110, even though the focus actuator has risen to the final position,
This is a case where the FOK signal cannot be detected. Therefore, the CPU
At step 9, it is determined that the optical disk 1 is not attached. In this case, after the focus search operation is forcibly turned off in step 110, a warning sound is generated from the buzzer 14 in step 111.

In this embodiment, when the timer mode is selected and/or the time set in the timer is reached, it is determined whether or not the optical disc 1 is being played back, and the focus search operation is performed. A determination is made as to whether or not the optical disk 1 is attached. Since the buzzer 14 is configured to emit a warning sound when the optical disc 1 is not installed or when the optical disc 1 is already being played, the time when the buzzer 14 emits the warning sound is determined by the timer. The set time and/or time becomes the set time and/or the set time, thereby allowing the set time and/or time to be known and enabling the timer function.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4. Note that parts common to those in the above-mentioned embodiment are given the same reference numerals, and redundant explanations will be omitted. This other embodiment differs from the above-mentioned first embodiment in that, as a means for detecting whether or not the optical disc 1 is attached, instead of the focus search operation by the focus actuator, the light on the optical disc 1 is detected. It uses an optical sensor that detects reflections. Therefore, in this other embodiment, the FOK signal and FCZ signal output from the signal processing circuit 6, or signals corresponding to these, are not used.

A detector 27 consisting of a light emitting element 25 and a light receiving element 26 is provided at a lower position on the surface 2 side of the optical disc 1, and an optical disc detection circuit (hereinafter referred to as , simply referred to as the disk detection circuit]
28 are provided.

This disk detection circuit 28 is connected to the CPU 9, and when a control signal for detecting the presence or absence of the optical disk 1 is supplied from the CPU 9 to the disk detection circuit 28, the disk detection circuit 28 starts driving. The light emitting element 25 is driven by the control signal.

The light output from the light emitting element 25 is reflected by the surface 2 of the optical disk 1 and reaches the light receiving element 26, where it is converted into an electrical signal. This electrical signal is supplied to the disk detection circuit 28.

In the disk detection circuit 28, the light receiving element 26
When the electrical signal supplied from the CPU 9 exceeds a predetermined threshold level, a high-level detection signal is generated, and the detection signal is supplied to the CPU 9. When the detection signal is supplied at a high level, the CPU 9 determines that the optical disc 1 is loaded. Other contents are the same as those in the above-mentioned embodiment, so redundant explanation will be omitted.

The circuit operation of this other embodiment will be explained below with reference to the flowchart of FIG. The processing contents of steps 201 to 203 are exactly the same as those of the above-mentioned embodiment, so a redundant explanation will be omitted. Incidentally, in step 203, it is determined whether or not reproduction is in progress. If it is determined that the playback is in progress, the process advances to step 206, and the buzzer 14 is activated in step 206.
A warning sound is generated. If it is determined that the playback is not in progress, the process proceeds to step 204.

In the flow after step 204, it is determined by the detector 27 and the disk detection circuit 28 whether or not the optical disk 1 is mounted. At step 204, from the CPU 9 to the disk detection circuit 28,
A control signal for checking whether or not the optical disk 1 is attached is supplied to the optical disc 1. The disk detection circuit 28 supplies a drive control signal for driving the light emitting element 25 of the detector 27 to the light emitting element 25 based on the above-mentioned control signal.

The light emitting element 25 is driven by the above drive control signal. The light output from the light emitting element 25 is reflected by the surface 2 of the optical disk 1 and reaches the light receiving element 26, where it is converted into an electrical signal. This electric signal is converted into a detection signal by the disk detection circuit 28,
The detection signal is supplied to the CPU 9.

In step 204, based on the detection signal output from the disk detection circuit 28 described above, the CPU
At step 9, it is determined whether or not the optical disk 1 is attached. That is, if the detection signal is at a high level, it is determined that the optical disc 1 is mounted, and the process proceeds to step 205.
Proceed to. Further, if the detection signal is at a low level, it is determined that the optical disk 1 is not installed, and step 20
Proceed to 6.

In step 205, the timer mode is selected, the time preset in the timer and/or the time has reached, and the optical disc 1 is installed, so the optical disc 1 is A playback operation is performed. That is, in step 205, the servo loop is closed and focus servo control is performed, and in step 207, the optical disc 1 is reproduced.

In step 206, the optical disc 1 is not mounted, and in this step 206, the buzzer 14 generates a warning sound.

[0043] Regarding other configurations, actions, effects, etc.,
Since this embodiment is similar to the embodiment described above, duplicate explanation will be omitted.

[0044]

[Effects of the Invention] According to the disc playback device according to the present invention, a warning is issued when it is detected that a disc is not installed or that a disc is being played at a set time and/or time. Since the time when the warning is issued becomes the time and/or time set in the timer, it is possible to know the set time and/or time and therefore enable the timer function. It has the effect of gaining.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a disc playback device according to the present invention.

FIG. 2 is a flowchart showing the operation of one embodiment.

FIG. 3 is a block diagram showing another embodiment.

FIG. 4 is a flowchart showing the operation of another embodiment.

[Explanation of symbols]

1. Optical disk 4 Optical pickup 6 Signal processing circuit 7 Servo circuit 9 CPU 10 Key operation section 12 Driver circuit 14 Buzzer 25 Light emitting element 26 Photo receiving element 27 Detector 28 Optical disk detection circuit

Claims (1)

[Claims] [Claim 1] In a disc playback device equipped with a timer function, when the disc is not loaded at the set time and/or time, or when the disc is played at the set time and/or time A disc playback device characterized in that it issues a warning.