JP2577310B2 - Auto loading disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-loading disc player having an optical pickup.

[0002]

2. Description of the Related Art A conventional player automatically ejects a disc when the disc cannot be focused because the disc is inserted upside down in the operation after the loading of the disc is completed.

[0003]

In a conventional auto-loading disc player, an operation section is provided for a user to give a disc loading instruction, and during the disc ejection when the focus cannot be locked in, the operation is performed. A user who did not know the cause sometimes issued a carry-in command again from the operation unit .

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide an auto-loading disc player which solves the above-mentioned disadvantages by prohibiting reloading during an ejecting operation when focus cannot be obtained. Aim.

[0005]

An auto-loading disc player according to the present invention comprises a loading mechanism for transporting a disc between a slot position of a housing and a reproduction position in the housing, and a loading mechanism for moving the disc to the slot position.
Detecting means for detecting that a disk has been set; an operating unit for giving a disk loading / unloading command; and a loading / unloading disk in response to a loading / unloading command from the operating unit. A controller that controls a loading mechanism, an optical pickup that reads information recorded on the disc at the playback position,
A focus servo circuit for controlling a focusing operation of the pickup and supplying a lock-in signal to the controller at lock-in, wherein the controller performs a dis- play based on an output from the detection means.
Controlling the controller to carry in the disc, and controlling the loading mechanism to automatically carry out the disc when the lock-in signal is not supplied within a predetermined time from the end of loading the disc. It is characterized in that it does not receive a disk loading command from the operation unit.

[0006]

[Function] When a disc cannot be focused because the disc has been inserted upside down, the disc ejection is completed ignoring the disc loading command from the operation unit by the user, so that the disc is completely ejected. By looking at the disc that has been inserted, it is possible to recognize the reason why the user cannot lock in, such as when the disc is inserted upside down.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing the appearance of a slot-in type in-vehicle auto-loading disc player to which the present invention is applied, and FIG. 2 is a schematic configuration diagram showing the internal structure thereof.

First, in FIG. 1, a front panel 2 constituting a part of a housing 1 is provided with a slot 4 for inserting a disk 3 to be reproduced, extending in the left-right direction in the figure. The disk 3 is, for example, a so-called compact disk on which audio information is converted into PCM (Pulse Code Modulation) and recorded, and has an outer diameter of about 12 cm. The front panel 2 is further provided with a plurality of operation keys for issuing various operation commands to the disc player, for example, commands such as play start and disc eject, and an operation key group 5 is configured by these keys. I have.

In FIG. 2, a disc 3 inserted from a slot 4 is positioned at a predetermined position (hereinafter, referred to as a slot position) on a tray 6 by a positioning means (not shown), and a part of the disc 3 is a front panel. 2 is supported on the tray 6 in a state of protruding outside. The tray 6 is loaded with a loading motor 7 as a driving source, and a slot 3 for the disk 3 carried by the driving force transmitting mechanism 8 for transmitting the rotational driving force of the motor 7 to the tray 6 as a linear driving force in the horizontal and vertical directions in the drawing. A loading mechanism for transporting between the position and a reproducing position in the housing 1 to be described later is configured.

In this loading mechanism, the tray 6 carries the disk 3 set at the slot position and moves rightward from the solid line position in the drawing, and the center hole of the disk 3 is fixed to the rotating shaft of the spindle motor 9. When it reaches the turntable 10, it descends directly below and
Is further lowered after being placed on the turntable 10 and stopped at a position slightly separated from the disk surface as shown by a two-dot chain line in the figure, and the loading operation of the disk 3 is performed by the above series of operations. . The position where the disc 3 is placed on the turntable 10 is the above-described reproduction position.

The unloading (ejecting) operation of the disk 3 is performed by a reverse rotation of the loading motor 7 and following a path completely opposite to that of the above-described loading operation. The loading mechanism described above has been disclosed by the present applicant in Japanese Patent Application No. 59-200145-2001.
No. 53, etc., and a detailed description of its configuration and operation will not be repeated here.

Various detection switches are provided in the housing 1. First, a disk detection switch 11 for detecting that the disk 3 is at the slot position is provided. The disk detection switch 11 is turned on when the disk 3 is set at the slot position, and the disk 3 is removed from the position. When turned off, it is turned off.

The loading completion detection switch 12 is turned on by engaging with the tray 6 after the disc 3 is placed on the turntable 10, and detects that the loading operation has been completed. Further, the ejection completion detection switch 13 is turned on by engaging with the tray 6 which has reached the forefront (front panel 2 side) position during the ejection operation by the loading mechanism,
It detects that the ejection operation has been completed.

The disk 3 placed on the turntable 10 is driven to rotate by a spindle motor 9, and the recorded information is read by an optical pickup 14. The pickup 14 is mounted on a carriage (not shown) movably provided in the radial direction of the disk 3.
Is driven through the gear mechanism 16. The signals generated from the operation key group 5 disposed on the front panel 2 and the detection switches 11 to 13 described above are transmitted to the housing 1
Is transmitted to the control system shown in FIG.

FIG. 3 shows the configuration of a control system. The control system is a CPU (central processing unit) 2 which is a control center.
0 and RAM (random access
(Memory) 21 and the like. The CPU 20 includes a spindle servo circuit 22 for controlling the rotation speed of the spindle motor 9 and a carriage for controlling the rotation speed of the carriage motor 15 based on signals generated from the operation key group 5 and the detection switches 11 to 13 and the like. For the servo circuit 23 and the motor drive circuit 30 for driving the loading motor 7, a control signal is generated at a timing described later, and display data is output to a display 24 for performing various displays.

The read information read from the disk 3 by the pickup 14 is subjected to signal processing such as demodulation and error correction by a signal processing circuit 25 and then supplied to the CPU 20 and D / A (digital / analog) conversion. Vessel 26
Is converted into analog information, and is output as an audio signal of the left (L) and right (R) channels via the electronic volume circuit 27. A focus servo circuit 28 for controlling the position of the focal point of the information reading spot emitted from the pickup 14 and converged on the recording surface of the disk 3 in the vertical direction with respect to the recording surface; A tracking servo circuit 29 for controlling the position of the read spot in the disk radial direction is provided.

The focus servo circuit 28 controls the CPU 20 when the reproduction is started or when the focus is lost during the reproduction.
Is controlled to perform the focusing operation of the pickup 14 in response to a command issued from the
A drive of a focus actuator (not shown) built in the pickup 14 is controlled based on a focus error signal generated by a known detection method such as an astigmatism method. Send to CPU20.

On the other hand, the tracking servo circuit 29 supplies a drive signal to a tracking actuator (not shown) incorporated in the pickup 14 in response to a command issued from the CPU 20 at the time of a jump or the like, and at the time of normal reproduction. By supplying a tracking error signal generated by a known detection method such as a three-beam method, the position of the information reading point in the disk radial direction is controlled. The tracking error signal is also supplied to the carriage servo circuit 23, and its low-frequency component becomes a drive signal for the carriage motor 15 during normal reproduction.

Since this disc player is for use in a vehicle,
The CPU 20 is operated by a backup power supply, and each mechanism is a so-called accessory switch (not shown) of an automobile.
It is configured to operate by a main power supply supplied by turning on the power supply. However, among the respective mechanisms, only the loading mechanism including the loading motor 7 and its drive circuit 30 is provided in the housing 1 even when the main power is turned off.
It operates with a backup power supply so that the disk 3 loaded therein can be ejected. Then, an Acc detection circuit 31 for detecting the interruption of the main power supply.
The Acc detection circuit 31 supplies a detection signal to the CPU 20 when the main power supply is cut off.

As shown in FIG. 4, the keys in the operation key group 5 include increasing (UP) and decreasing (DOWN) the volume.
, A volume "UP" key 50 and a volume "DOWN" key 51, and a balance "L" key 52 and a balance "R" key 53 for balancing the volume of the left and right channels. The processing when these keys are operated is performed by the CPU 20 as software.

That is, when the volume "UP" key 50 or the volume "DOWN" key 51 is operated, the CPU 20 controls the electronic volume circuit 27 to increase or decrease the volume of both the left and right channels at the same time. When the balance "L" key 52 or the balance "R" key 53 is operated, the data and the clock are sent to increase the volume of one channel and decrease the volume of the other channel. The change state of the volume at this time is displayed on the display 24.

Incidentally, as the electronic volume circuit 27,
For example, it is composed of a plurality of resistors connected in series to each other and a plurality of analog switches connected in parallel to each of these resistors. The volume control is performed by turning on and off the plurality of analog switches according to data from the CPU 20. A known configuration may be used.

Each of the volume "UP" key 50 and the volume "DOWN" key 51 has a function of giving commands for increasing and decreasing the volume as described above, and both keys 50 and 51 are operated in duplicate. Sometimes the volume is 2
It also has the function of giving a command to lower it by about 0 dB at a time.

Next, the operation procedure of the auto-loading disc player executed by the CPU 20 will be described with reference to FIG.
A brief description will be given according to the reproduction order with reference to the flowcharts of FIGS.

First, a series of operations of loading, playing and ejecting will be described with reference to the flowchart of FIG. 6. First, the disk 3 is inserted into the housing 1 from the slot 4 and set at the slot position on the tray 6 as shown in FIG. Then, the disk detection switch 11 is turned on. When detecting that the disk detection switch 11 is turned on (step 1), the CPU 20 issues a loading command to the loading motor 7 via the motor drive circuit 30. As a result, the loading motor 7 rotates to activate the loading mechanism, and the loading operation is started (step 2).

The tray 6 carrying the disk 3 moves rightward from the position shown by the solid line in FIG.
When it reaches above 0, it descends directly from that position, whereby the disk 3 is placed on the turntable 10 as shown by the two-dot chain line in FIG. 2, and the loading operation is completed by the above series of operations. At this time, the loading completion detection switch 12 is turned on. The CPU 20
When loading completion is detected by the ON output of the loading completion detection switch 12 (step 3), the mode shifts to a focus mode for taking the focus of the pickup 14 (focusing) (step 4). This focus mode will be described later.

When the focus is set in the focus mode, the reading operation of the pickup 14 is started. Before reading the program area, first, reading of the recorded information in the lead-in area of the disk 3 is started (step 5). ), Then display mode (step 6)
Then, the process proceeds to the play mode (step 7). The read TOC information is stored in the RAM 21. In the lead-in area of the disc, the so-called TO, such as the number of songs recorded on the disc, the total absolute time, and the playing time of each song, is stored.
C (Table Of Contents) information is recorded, and it is necessary to read the TOC information at the start of a performance. In the play mode, operations such as program selection, scanning, and search are performed in addition to normal sequential performance.

After the performance is completed, the carriage (not shown) on which the pickup 14 is mounted reaches its movement limit position,
When a detection switch (not shown) is turned on, the CPU
20 detects that the performance has ended (step 8), and issues an ejection command to the loading motor 7 via the motor drive circuit 30. As a result, the loading motor 7 rotates in the direction opposite to the direction of the loading operation and starts the ejection operation (step 9). In this ejecting operation, the tray 6 unloads the disc 3 from the reproduction position to the slot position by following the completely reverse process of the above-described loading operation, and the tray 6 reaches the forefront position shown by a solid line in FIG. When the operation is completed, the ejection completion detection switch 13 is turned on.

When the CPU 20 detects that the ejection has been completed by the output of the ejection completion detection switch 13 (step 10), the CPU 20 subsequently determines whether or not there is a reload command by a key input or the like in the operation key group 5 (step 11). If there is a reload command, a loading command is again issued to the loading motor 7 via the motor drive circuit 30 to start the loading operation (step 12). When the completion of the loading operation is detected (step 13), the CPU 20 immediately plays without reading the TOC information because the same disk performance as the previous time is performed and the TOC information is stored in the RAM 21 and is valid. To the play mode (step 7).

After the ejection is completed, if it is determined in step 11 that there is no reload command, it is determined whether the disk 3 has been removed from the slot position (step 14). The removal of the disk 3 can be detected by the off output of the disk detection switch 11. Step 1
When it is determined in step 4 that the disk 3 has been removed from the slot position, the TOC information stored in the RAM 21 is invalidated (step 15), and an invalid flag is set. Thus, a series of operations of loading, playing, and ejecting are completed.

In the above-described series of operations, the TOC information stored in the RAM 21 is not invalidated when the ejection operation of the disk 3 is completed, but is invalidated only when the disk 3 is removed from the slot position. Therefore, when playing the ejected disc continuously, it is not necessary to read the TOC information again, so that the operation can smoothly proceed to the playing operation.

Next, the focus mode (step 4) in FIG. 6 will be described with reference to the flowchart in FIG.

The CPU 20 first issues a focusing operation start command to the focus servo circuit 28 (step 20), and at the same time, starts a timer for a predetermined time Ta built in the CPU 20 (step 21). Then, it is determined whether or not the focus servo is locked in (step 22). If the focus servo is locked, the timer is cleared (step 23), and thereafter, the process returns to the main flow of FIG. The determination as to whether or not the focus servo has locked in can be made by using a lock-in signal generated from the focus servo circuit 28 when the focus servo locks in.

If it is determined in step 22 that the disk has not been locked in, it is determined whether or not a predetermined time Ta has elapsed (step 24). If it has elapsed, the disc loaded at the reproduction position is ejected. For this purpose, an ejection command is issued to the loading motor 7 via the motor drive circuit 30 (step 25). That is, when the focus cannot be obtained due to the insertion of the disc upside down, the disc is ejected after a certain time Ta has elapsed.

After the ejection command, it is determined whether or not there is a reload command by a key input or the like in the operation key group 5 (step 26). If there is no reload command, the completion of ejection is detected (step 27). Thereafter, the operation is stopped. If it is determined in step 26 that there is a reload command, the key input for the command is ignored (step 28).
Move to 7.

That is, during the disc ejection when the disc cannot be focused because the disc is inserted upside down, the ejection of the disc is completed ignoring the reload command from the user. The user can recognize the cause of the lock-in failure, such as the disc being inserted upside down.

Next, the display mode (step 6) in FIG. 6 will be described with reference to the flowchart in FIG.

In the main flow of FIG. 6, the reading of the TOC information is started (step 5), and then the main display mode is entered. When the reading of the TOC information is started, predetermined information is displayed on the disc display 24, for example, As shown in FIG. 5, a blinking display of "---" is performed using one segment at the center of the 7-segment display (step 3).
0), when the reading of the TOC information is completed (step 3)
1), a fixed time Tb (for example,
5 seconds), the timer is started (step 32), and the read TOC information, that is, the number of music pieces and the total absolute time are displayed (step 33). In the flowchart of FIG. 6, for convenience of explanation, the display mode and the play mode are shown as separate modes. However, after reading the TOC information in the display mode, the play operation is started.

Normally, TO is completed after the loading of the disc is completed.
At the time of so-called setup before reading the C information and shifting to the play operation, the TOC information has not been read yet, and there is no data that can be displayed on the display 24.
Since nothing can be displayed, the user may not be able to determine what operating state the player is in. However, as described above, by displaying something even without the TOC information, the user can be notified that the player is in the setup state. Note that the display information in this case is not limited to the blinking display of "---" using a seven-segment display.

When it is detected that another mode is designated by key input of the track ±, FF, REV or the like in the operation key group 5 while displaying the number of music pieces and the total absolute time, etc. 34), the timer is cleared (step 35), and at the same time, the performance (reproduction) status information, that is, the track number (track number), based on the read information of the pickup 14 during the reproduction of the program area, The elapsed time (minutes, seconds) and the like are displayed (step 36). These pieces of performance information are recorded on the Q channel of the subcode signal in the so-called CD format, and can be detected from the information read by the pickup 14. In the state where the number of songs and the total absolute time are displayed, there is no other mode designation, and the display state is kept for a certain time T.
If it is determined that b has elapsed (step 37), the process proceeds to step 36, and the display is switched to the display of the performance status information described above.

That is, the read TOC information is displayed for a predetermined time Tb, and if another mode is designated before the predetermined time Tb elapses, the display is switched to the display of the performance status information at that time, and the display is switched to the display for a certain time. When Tb elapses, the display is automatically switched to the display of the performance status information.

Next, the operation when the focus is lost during the play will be described with reference to the flowchart of FIG.

The CPU 20 includes a focus servo circuit 28
The lock-in signal generated in the lock-in state of the servo loop is constantly monitored in a predetermined cycle, and when it is detected that the lock-in signal has disappeared, it is determined that the focus has been lost, and the focus servo circuit 28 is controlled to perform the focusing operation. A start command is issued (step 40), and at the same time, the CP
A timer for a fixed time Tc built in U20 is started (step 41). Then, it is determined whether or not there has been a disc eject command or a stop command by a key input in the operation key group 24 (step 42). If not, it is determined whether or not the focus servo has locked in (step 43). ). When the focus servo is locked in, that is, when the focus is obtained, the timer is cleared (step 44), and thereafter, the flow shifts to the play operation again.

If the lock-in signal of the focus servo is not obtained within the predetermined time Tc (step 45), it is determined that the focus cannot be obtained by the current focusing operation (focus NG) at that time, and the N built in the CPU 20 is determined.
The G counter is incremented (step 46). Then, it is determined whether or not the count value N of the counter has reached a predetermined value, for example, "16" (step 47).
In the case of $ 16, the process returns to step 40 to perform the focusing operation again, and a maximum of 16
The focusing operation is repeated consecutively.

If the focus cannot be obtained even if the focusing operation is repeated 16 times in succession, the NG counter is cleared (step 48), and then the stop state is set (step 49). Here, the stop state refers to a state in which the disk is at the reproduction position, the main power is cut off, and the operation of each mechanism is stopped. In this stop state, when it is detected that a play command has been issued by a key input on the operation key group 5 (step 50), the flow shifts to step 40 to start the focusing operation again.

As described above, by limiting the number of times of repeating the focusing operation, the load on the servo system including the focus actuator and the like can be reduced, and the heat generation of the pickup 14 can be prevented. .

If there is a disc eject command or a stop command during the focusing operation (step 42), the flow shifts to step 48 to clear the NG counter, and then the stop state is set. If there is a disc eject command, the operation shifts to a disc eject operation via a stop state. As described above, if there is a disc eject command or a stop command, N
By clearing the G counter, even when shifting from the stop state to the play state and performing the focusing operation again, the focusing operation can be repeated up to 16 times continuously until the focus is obtained.

Next, the operation when the accessory switch of the car is turned off during play as a special operation will be described with reference to the flowchart of FIG.

The CPU 20 constantly monitors the detection output of the Acc detection circuit 31 in a predetermined cycle. When the CPU 20 detects that the main power supply (Acc) is turned off by the detection output (step 60), the operation key group 5 is operated. It is determined whether or not there is an eject command by the key input of (1) (step 61). If the eject command is present, the loading motor 7 is sent to the loading motor 7 via the motor drive circuit 30 in order to eject the disc at the reproduction position. An ejection command is issued (step 62). After the eject command, it is determined whether or not there is a reload command by a key input or the like in the operation key group 5 (step 63). If there is no reload command, the ejection completion is detected (step 64). It will be stopped. If it is determined in step 63 that there is a reload command, the key input for the command is ignored (step 65).
Move to 4.

That is, while the disk is being ejected due to the interruption of the main power supply, no reload command is received from the disk, and the transition from the eject operation to the reload operation is prohibited. As a result, a reduction in the battery voltage can be prevented without repeating the loading operation and the ejecting operation.

[0051]

As described above, according to the auto-loading disc player of the present invention, when the disc is not ejected when the disc cannot be focused due to the disc being inserted upside down, the operation by the user is performed.
Since the disc ejection is completed ignoring the disc loading command from the work unit, it is possible to recognize the cause that the user can not lock in such as inserting the disc upside down by looking at the completely ejected disc. You can.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing the appearance of an in-vehicle autoloading disc player according to the present invention.

FIG. 2 is a schematic configuration diagram showing an internal structure of the vehicle-mounted auto loading disc player of FIG.

FIG. 3 is a block diagram showing a circuit configuration of a control system.

FIG. 4 is a block diagram showing a specific configuration of part of the circuit shown in FIG. 3;

FIG. 5 is a block diagram illustrating an example of a display method.

FIG. 6 is a flowchart showing a series of operations executed by the CPU.

FIG. 7 is a flowchart illustrating a focus mode.

FIG. 8 is a flowchart showing a display mode.

FIG. 9 is a flowchart illustrating an operation when a focus is lost during play.

FIG. 10 is a flowchart showing an operation when an accessory switch of a car is turned off during play.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 3 Disk 4 Slot 5 Operation key group 7 Loading motor 9 Spindle motor 11 Disk detection switch 12 Loading completion detection switch 13 Ejection completion detection switch 14 Pickup 15 Carriage motor

Claims (1)

(57) [Claims] 1. A loading mechanism for transporting a disc between a slot position of a housing and a reproduction position in the housing, and detecting that a disc has been set at the slot position.
Detection means, and an operation unit for giving a disk loading instruction or unloading instruction, and a controller that controls the loading mechanism to load or unload a disk in response to a disk loading instruction or unloading instruction from the operation unit, wherein the optical pickup for reading recorded information of the disc at the reproduction position, and a focus servo circuit for supplying a lock-in signal to the controller when performed and lock-in the control of the focusing operation of the pick-up, the controller, the Based on output from detection means
The controller controls the controller to carry in the disc, and controls the loading mechanism to automatically eject the disc when the lock-in signal is not supplied within a predetermined time from the end of the loading of the disc. An auto-loading disc player, wherein the disc loading command from the operation unit is not received.