JPH071593B2 - Disc player - Google Patents

Description

TECHNICAL FIELD The present invention relates to a disc player such as a compact disc (CD) player.

[Conventional technology]

FIG. 3 shows the structure of a conventional CD player.

In the figure, 3 is a disc set detection sensor consisting of a pair of light emitting / receiving elements for detecting whether or not a compact disc (abbreviated as disc hereinafter) 35 is set at a predetermined reproduction position, and 32 is a signal detection circuit. , 33 is a decoding circuit for error correction, 34 is a TOC (Table of Contents
nts) A control circuit that performs various controls necessary for writing information and disk playback, 36 is a memory, 37 is a display for displaying playback information such as TOC information, 38 is an operation system including various operation buttons and keys, 39 is a motor for rotating the disk 35, and 40 is an optical pickup for reading the recorded information on the disk 35.

When the disc 35 is set in the CD player, the disc set detection sensor 31 detects it and outputs a detection signal to the control circuit.
Send to 34. Upon receiving the detection signal from the disc set detection sensor 31, the control circuit 34 starts driving the motor 39 and rotates the disc 35.

Then, the TOC information in the lead-in area of the disk 35 is read by the optical pickup 40 and the signal detection circuit 32, and the TOC information is decoded by the decoding circuit 33, and then the memory 36
The desired information (for example, the total number of songs, the total playing time, etc.) is read from the stored TOC information and displayed on the display 37, and a standby state is prepared for a reproduction instruction from the operation system 38.

When an operation button or key (not shown) of the operation system 38 is operated to give a song number or a playback start command, the control circuit 34
Controls the necessary circuits to play the specified song.

When the eject button (not shown) provided on the operation system 38 is pressed to remove the disc 35 set as described above from the CD player, the eject mechanism (not shown) is activated and the disc 35 is manually operated. It is ejected to the so-called half insertion position where it can be grasped and taken out.

[Problems to be solved by the invention]

By the way, in the conventional CD player, when the disc is set to the reproducing position again from the half-inserted state, the disc set detection sensor 31 is reset to the predetermined reproducing position even though the disc is not exchanged. When the fact is detected, the TOC information is read again from the disc and written to the memory again. Therefore, the conventional CD player has a problem that the disc cannot be reproduced while the TOC information is rewritten (about 6 seconds).

[Object of the Invention]

The present invention has been made to solve the above-mentioned drawbacks of the conventional disc player, and in the case where it is set to the reproducing position from the half-inserted state, the reproducing is performed immediately without the need to read the TOC information. It is an object of the present invention to provide a disc player capable of playing.

[Outline of Invention]

In order to achieve the above object, the present invention is a disc player that reads and stores TOC information after a disc is set at a predetermined reproduction position, and detects that the disc is set at the reproduction position. A sensor, a sensor for detecting that the disc has been taken out of the player, and a detection result of the two sensors are used to detect that the disc is in the half-inserted state from the state set at the reproduction position. And a means for prohibiting the reading of the TOC information when it is set to the reproducing position again from the half-inserted state.

Embodiments of the Invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a CD player according to an embodiment of the present invention, and FIG. 2 is a timing chart showing the operation of the flip-flop shown in FIG.

In FIG. 1, reference numeral 1 is a disk removal detection sensor including a pair of light emitting and receiving elements for detecting whether the disk 12 has been taken out of the CD player from the half-inserted state shown by the solid line, and 2 is the disk 12 A disc set detection sensor composed of a pair of light emitting and receiving elements for detecting whether or not the disc is set at a predetermined reproduction position shown by a dotted line, 3 is a flip-flop operated at the timing of FIG. Trigger pulse generating circuit for generating a pulse at the output rising position, 5 is an optical pickup for reading the recorded information on the disk 12, and 6 is a trigger pulse generating circuit 4.
A signal detection circuit set to an operating state by a trigger pulse from 7, a decoding circuit 7 set to an operating state by a trigger pulse from the trigger pulse generating circuit 4, and 8 for writing TOC information to the memory 9 and reproducing a disc. A control circuit for performing various necessary controls, 9 is a memory, 10 is a display device, 11
Is an operation system including various operation buttons and keys, 12 is a disk, and 13 is a motor for rotating the disk 12.

Next, the operation of the above embodiment will be described with reference to the timing chart of FIG.

When the disc 12 is inserted from the disc insertion opening (not shown) and pushed to the half-inserted position shown by the solid line, the disc ejection detection sensor 1 detects this, and as shown in FIG. "Signal" is generated and sent to the reset terminal of the flip-flop 3. However, since the reset terminal of the flip-flop 3 is reset at the trailing edge of the pulse, the output state of the flip-flop 3 does not change at all.

When the disc 12 is pushed to the half-inserted position shown by the solid line, the loading mechanism (not shown) operates and the disc
12 is transferred to the reproduction position indicated by the dotted line by the loading mechanism. Then, when the disc 12 is set at a predetermined reproduction position shown by a dotted line, the disc set detection sensor 2
Detects this and sends an "H" signal to the flip-flop 3 as shown in FIG. Flip-flop 3 is this "H"
The signal is set at the rising position of the signal as shown in FIG. 2, and the "H" signal is reproduced from its output terminal Q and sent to the trigger generation circuit 4.

The trigger generation circuit 4 operates from the flip-flop 3 to the above "H".
When the signal is received, a trigger pulse is generated at the rising position and sent to the signal detection circuit 6 and the decoding circuit 7. The signal detection circuit 6 and the decoding circuit 7 are set to the operating state by this trigger pulse.

On the other hand, the control circuit 8 drives the motor 13 to rotate the disk 12 when the disk 12 is set at the predetermined reproduction position shown by the dotted line. As a result, the TOC information in the lead-in area of the disk 12 is read by the optical pickup 5 and sent to the signal detection circuit 6.

Since the signal detection circuit 6 and the decoding circuit 7 are set in the operating state by the trigger pulse of the trigger pulse generation circuit 4 as described above, the TOC information sent from the optical pickup 5 is transmitted via the signal detection circuit 6. Decoding circuit 7
After being sent to and decoded, the data is written in a predetermined address position of the memory 9 under the control of the control circuit 8. Then, the control circuit 8 reads out the desired information (for example, the total number of songs, the total playing time, etc.) from the TOC information stored in the memory 9, displays it on the display device 10, and gives a reproduction instruction from the operation system 11. Be prepared and wait.

When an operation button or key (not shown) of the operation system 11 is operated to give a song number or a reproduction start command, the control circuit 8
Controls the necessary circuits to play the specified song.

When the eject button (not shown) of the operation system 11 is pressed in the state where the disc 12 is set to the predetermined reproduction position as described above, the eject mechanism (not shown) is actuated, and the disc 12 is indicated by the dotted line. The eject operation for taking out from the position to the half insertion position shown by the solid line is started. By the start of this eject operation, the disc 12
When is deviated from the reproduction position indicated by the dotted line, the disc set detection sensor 2 detects this and a low level signal (hereinafter,
"L" signal) is sent to the flip-flop 3. However, the flip-flop 3 is not inverted by this "L" signal, and the output terminal Q thereof still maintains the "H" state as shown in FIG.

Then, when the eject operation progresses and the disk 12 retracts to the half insertion position shown by the solid line, the eject operation ends. When ejected to this half-inserted position, the disc 12 can be grasped by hand and pulled out of the CD player.

When the disc 12 is ejected to the half-inserted position shown by the solid line as described above,
When the disc 12 is pushed in to play the disc 12 again, the loading mechanism is activated and the disc 12 is in the half-inserted state.
Is set to the playback position indicated by the dotted line again.

The disk set detection sensor 2 detects the resetting to the dotted line position, and again sends the "H" signal to the flip-flop 3 as shown in FIG. At this time, since the output Q of the flip-flop 3 is maintained in the "H" state as described above, even if the "H" signal is given from the disk set detection sensor 2, the output Q is still "H". The trigger pulse generation circuit 4 does not generate a drigger pulse.

Therefore, when the disk 12 is ejected to the half insertion position shown by the solid line and then set to the reproduction position shown by the dotted line again, the trigger pulse generation circuit 4 does not generate the trigger pulse and the signal detection circuit 6 Therefore, the decoding circuit 7 is never set to the operating state. Therefore, even if the TOC information is sent from the optical pickup 5, the TOC information is not rewritten in the memory 9, and the TOC information stored in the memory 9 is used as it is as the TOC information for the disc 12. It As a result, TOC information can be obtained at the same time as the resetting of the disc 12 is completed, and the disc can be immediately reproduced.

On the other hand, hold the disk 12 in the half-inserted state by hand and
When the disc 12 is pulled out of the player, when the disc 12 moves to the left from the solid line position, the output of the disc ejection detection sensor 1 changes from "H" to "L" as shown in FIG. The flip-flop 4 is reset at the trailing edge of the disk to prepare for the operation of writing the TOC information when the next disk is inserted.

The control circuit 8 causes the display device 10 to display the contents of the TOC information stored in the memory 9 and necessary information in accordance with instructions from the operation buttons and keys of the operation system 11.

In the above-mentioned embodiment, it is shown that when the disc 12 is set again from the half-inserted state, the reproduction state is immediately started, but when the disc 12 is in the half-inserted state, the CD player holds the TOC information and the like. Therefore, a function of displaying the information on the display device 10 may be provided.

Further, in the above-mentioned embodiment, the sensors 1 and 2 are each constituted by an optical sensor, but a sensor composed of a micro switch or the like may be used.

〔The invention's effect〕

As described above, since the present invention has the above-mentioned configuration, the following effects can be obtained.

After the disc is set to the specified playback position, it is ejected to the half-inserted state, and if it is set to the position again from this half-inserted state, the TOC information held in the memory is It can be used as TOC information, and there is no need to wait for the time to read TOC information, and playback can be performed immediately after resetting.

Further, since the disc player of the present invention retains the TOC information when the disc is set in the latter half of the inserted state, in the case of an AV system or the like incorporating the disc player of the present invention, the disc of the present invention is used as a reproduction source. If the player is selected and the disc is in the half-inserted state at that time, the TOC information can be displayed immediately after the playback source is selected and the contents can be known, and the disc in the half-inserted state can be set again. It can be played back from the middle in the state.

[Brief description of drawings]

FIG. 1 is a block diagram of a CD player according to an embodiment of the present invention, FIG. 2 is a timing chart showing the operation of the flip-flop shown in FIG. 1, and FIG. 3 is a block diagram showing the structure of a conventional CD player. Is. 1 ... Disc ejection detection sensor, 2 ... Disc set detection sensor, 3 ... Flip-flop, 4 ... Trigger generation circuit, 5 ... Optical pickup, 6 ... Signal detection circuit, 7 ... Decoding circuit, 8 ... Control circuit, 9 ... Memory, 11 ... Operation system, 12
…compact disc.

Claims (1)

[Claims] 1. A disc player for reading and storing TOC information after a disc is set at a predetermined reproducing position, a sensor for detecting that the disc is set at the reproducing position, and the disc being the player. A sensor that detects that the disc has been removed from the disc and a detection output of the two sensors that detects that the disc is in the half-insertion state from the state where the disc is set to the reproduction position, and the half-insertion state is detected again. A disc player, comprising means for prohibiting reading of the TOC information when set to the reproduction position.