JP2577310C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-loading disc player having an optical pickup.
About. 2. Description of the Related Art In a conventional player, in an operation after loading of a disc is completed,
If focus cannot be obtained due to the
The disc is ejected. [0003] In a conventional auto-loading disc player, a user carries a disc.
There is an operation unit for giving the ON command, and the focus cannot be locked in.
During the disc ejection, the user who does not know the cause
In some cases, a carry-in command was issued again. [0004] The present invention has been made in view of the above points, and has been made in a case where focus cannot be obtained.
The above-mentioned problem is solved by prohibiting reloading during the eject operation of
It is an object of the present invention to provide an automatic loading disc player. [0005] An auto-loading disc player according to the present invention comprises a slot in a housing.
Loading the disc between a position and a reproduction position in the housing.
And a detecting means for detecting that a disk has been set at the slot position
An operation unit for giving a disk carry-in instruction or a carry-out instruction; and
In order to load or unload a disk in response to a disk loading or unloading command,
A controller for controlling a loading mechanism, and the disc at the reproduction position.
Optical pickup for reading recorded information of the same, and a focussing of the pickup
The lock-in signal is controlled by the controller when the lock-in is performed.
A focus servo circuit for supplying to the controller, the controller comprising:
To load a disc based on the output from The loading mechanism Control and de
If the lock-in signal is not supplied within a predetermined time from the end of disk loading,
Controlling the loading mechanism to automatically eject the disc, during this control
It is characterized in that it does not receive a disk loading command from the operation unit. [0006] When the focus cannot be obtained because the disc is inserted upside down, etc.
During disc ejection, ignore the disc loading command from the operation unit by the user
Completes the ejection of the disc, so that the user cannot lock in, such as when the disc is inserted upside down, by looking at the completely ejected disc.
The cause can be recognized. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a slot-in type in-vehicle auto-loading device to which the present invention is applied.
FIG. 2 is a schematic perspective view showing the appearance of the disk player, and FIG. 2 is a schematic configuration diagram showing the internal structure thereof.
It is. First, in FIG. 1, a front panel 2 forming a part of a housing 1 is
The slot 4 for inserting the disc 3 to be produced
Is provided. The disc 3 has, for example, audio information of PCM (Pulse Code M).
It is a so-called compact disc that has been recorded as odulation.
It is about 12 cm. The front panel 2 also has a
To issue various operation commands, for example, commands such as play start and disc eject.
Are arranged, and these keys constitute an operation key group 5.
Have been. In FIG. 2, a disc 3 inserted from a slot 4 is
Position (hereinafter referred to as a slot position) by a positioning means (not shown).
Supported on the tray 6 with a part of the disk 3 protruding outside the front panel 2
Is done. The tray 6 includes a loading motor 7 as a driving source, and a rotating drive of the motor 7.
Driving force that transmits power to tray 6 as linear driving force in the horizontal direction and vertical direction in the figure
The disk 3 carried by the transmission mechanism 8 or the like is positioned between the slot position and the inside of the housing 1.
It constitutes a loading mechanism for transporting to and from the reproduction position described above. [0010] In such a loading mechanism, the tray 6 is provided with the data set at the slot position.
The disc 3 is held and moved rightward from the position indicated by the solid line in FIG.
When the disc 3 reaches the turntable 10 fixed to the rotating shaft of the pindle motor 9, it descends immediately below, and after the disc 3 is placed on the turntable 10, it descends further.
Stop at a slight distance from the disk surface as shown by the two-dot chain line
The loading operation of the disk 3 is performed by the above operation. Disk 3 is
The position placed on the turntable 10 is the reproduction position described above. The unloading (ejecting) operation of the disk 3 is performed by rotating the loading motor 7 in a reverse direction.
Rolling is performed along 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.
Nos. 200145 to 200153, etc., and detailed configuration and operation thereof
Will not be described in detail here. Various detection switches are provided in the housing 1. First, disk 3
A disk detection switch 11 for detecting that the
The disk detection switch 11 sets the disk 3 to the slot position.
When the disc 3 is removed from the position, it is turned on.
You. The loading completion detection switch 12 loads the disc 3 on the turntable 10.
By being engaged with the tray 6 after being placed, it is turned on, and the loading operation is performed.
It detects that the operation is completed. The ejection completion detection switch 13 is set to low.
To the forefront (front panel 2 side) position during the ejecting operation by the
The tray is turned on by engaging the tray 6 that has reached, and the ejection operation is completed.
Detect that it has done. The disc 3 placed on the turntable 10 is moved by the spindle motor 9.
It is driven to rotate, and the recorded information is read by an optical pickup 14.
You. The pickup 14 is a key movably provided in the radial direction of the disk 3.
The carriage is mounted on a carriage (not shown).
5 is driven via a gear mechanism 16. Each signal emitted from the operation key group 5 disposed on the front panel 2 and the above-described detection switches 11 to 13 and the like is
The signal is transmitted to the control system shown in FIG. FIG. 3 shows a configuration of a control system. The control system is a CPU which is a control center.
(Central processing unit) 20 and RAM (random access memo) as storage means
I) It has a microcomputer configuration including 21 and the like. The CPU 20 operates
Based on the signals generated from the operation key group 5 and the detection switches 11 to 13, etc.
A spindle servo circuit 22 for controlling the rotation speed of the pindle motor 9;
Carriage servo circuit 23 for controlling the rotation speed of
The motor drive circuit 30 for driving the motor 7 is controlled at a timing described later.
A signal is generated, and display data is output to a display 24 that performs various displays.
Power. The read information read from the disk 3 by the pickup 14 is used for signal processing.
The signal is supplied to the CPU 20 after signal processing such as demodulation and error correction is performed on the path 25.
Both are converted into analog information by a D / A (digital / analog) converter 26,
Left (L) and right (R) channel audio signals via electronic volume circuit 27
Is output as In addition, the data is emitted from the pickup 14 and recorded on the disk 3.
Position of the focal point of the information reading spot converged on the surface in the direction perpendicular to the recording surface
The focus servo circuit 28 for controlling the recording track of the disc 3
Tracking server that controls the position of the information reading spot in the disk radial direction
A circuit 29 is provided. The focus servo circuit 28 is used when the reproduction is started or when the focus is lost during the reproduction.
Etc., the focus of the pickup 14 in response to a command issued from the CPU 20.
Control to perform singing operation, and during normal reproduction, a well-known detection method such as astigmatism method.
Built into the pickup 14 based on the focus error signal generated by the
Drive and control the focus actuator (not shown)
When a lock-in is performed at the time of pull-in, a lock-in signal is sent to the CPU 20. On the other hand, the tracking servo circuit 29 has a built-in tracking
In response to a king actuator (not shown), a jump is issued from the CPU 20.
A drive signal is supplied in response to a given command. During normal reproduction, a well-known method such as a three-beam method is used.
By supplying the tracking error signal generated by the detection method
The position control of the information reading point in the disk radial direction is performed. In addition,
The error signal is also supplied to the carriage servo circuit 23, and its low-frequency component is normally reproduced.
It becomes a drive signal of the carriage motor 15 at the time of birth. Since this disk player is for use in a vehicle, the CPU 20 operates on a backup power supply.
Each mechanism is turned on by a so-called accessory switch (not shown) of the automobile.
It is configured to operate by a main power supply supplied by the power supply. But each
Loading mechanism including loading motor 7 and its driving circuit 30
Only the mechanism is installed in the housing 1 even when the main power is turned off.
It operates on a backup power supply so that disk 3 can be ejected.
You. Further, an Acc detection circuit 31 for detecting the disconnection of the main power supply is provided.
The Acc detection circuit 31 supplies a detection signal to the CPU 20 when the main power is turned off. As shown in FIG. 4, each key in the operation key group 5 includes an increase in volume (UP) and an increase in volume.
"UP" key 50 and the volume "UP"
DOWN "key 51 and a balun for balancing the volume of the left and right channels
A “L” key 52 and a balance “R” key 53 are included. These keys operate
The processing at the time of creation is performed by the CPU 20 as software. That is, the CPU 20 sends the volume “UP” to the electronic volume circuit 27.
”Key 50 or volume“ DOWN ”key 51 is operated.
Sending data and clocks to simultaneously increase or decrease the volume of the channel,
When the balance "L" key 52 or the balance "R" key 53 is operated, the data to increase the volume of one channel and decrease the volume of the other channel.
And a clock. The volume change state at this time is displayed on the display 24.
Is done. The electronic volume circuit 27 includes, for example, a plurality of serially connected
And a plurality of analog switches connected in parallel to each of these resistors.
The plurality of analog switches are turned on / off according to data from the CPU 20.
A well-known configuration that controls the volume by turning it off can be used. The volume “UP” key 50 and the volume “DOWN” key 51 are
As described above, it has a function of giving commands to increase and decrease the volume, and both keys 5
When 0 and 51 are operated twice, a command to lower the volume by about 20 dB at a time is given.
It also has the function of making. Next, the auto loading disc player executed by the CPU 20
Of the operation according to the reproduction order with reference to the flowcharts of FIGS.
A brief description will be given. First, a series of operations of loading, playing, and ejecting are described in a flowchart of FIG.
In the following description, the disk 3 is inserted into the housing 1 from the slot 4.
When set at the slot position on the tray 6 as shown in FIG.
The switch 11 is turned on. The CPU 20 operates the disk detection switch 11
When ON is detected (step 1), the loading mode is detected via the motor drive circuit 30.
A loading command is issued to the data 7. As a result, the loading motor 7
The loading mechanism rotates and the loading mechanism starts, and starts the loading operation (step 2).
). The tray 6 carrying the disk 3 only moves rightward from the position indicated by the solid line in FIG.
When the disk 3 reaches the position above the turntable 10, the disk 3 descends from that position, whereby the disk 3 is placed on the turntable 10 as shown by a two-dot chain line in FIG.
The loading operation is completed by the above series of operations. At this time, loading
The completion detection switch 12 is turned on. The CPU 20 completes this loading.
When the completion of loading is detected by the ON output of the detection switch 12 (step 3
), Focus for taking (focusing) of the pickup 14
The mode is shifted to (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 performed.
Before starting the operation, first read the disc before reading the program area.
Start reading the recording information in the lead-in area No. 3 (step 5), and thereafter
After the display mode (step 6), the mode shifts to the play mode (step 7). reading
The obtained TOC information is stored in the RAM 21. In the lead-in area of the disc
Includes the number of songs recorded on the disc, the total absolute time, the playing time for each song, etc.
All TOC (Table Of Contents) information is recorded, and this is always
Needs to be read. In play mode, in addition to normal sequential performance,
Operations such as program selection, scanning, and search are performed. After the performance is completed, a carriage (not shown) on which the pickup 14 is mounted is moved.
When the movement limit position is reached and a detection switch (not shown) is turned on, the CPU 20
Detects that the performance has ended (step 8), and
An ejection command is issued to the reading motor 7. This allows loading
The motor 7 rotates in the direction opposite to the direction of the loading operation to start the ejecting operation (
Step 9). In this ejecting operation, the tray 6 is loaded with the loading
The disc 3 is transported from the playback position to the slot position by following the completely reverse process
The tray 6 reaches the forefront position indicated by the solid line in FIG. 2, and the ejection operation is completed.
Then, the ejection completion detection switch 13 is turned on. The CPU 20 outputs an ejection signal by turning on the ejection completion detection switch 13.
When the completion of the reload command is detected (step 10), 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 11).
If there is, the loading motor 7 is again locked via the motor drive circuit 30.
A loading command is issued to start a loading operation (step 12). Low
When the CPU 20 detects that the loading operation has been completed (step 13),
The TOC information is stored in the RAM 21 and becomes effective.
The play mode (step step) without reading TOC information.
Control is performed to shift to 7). After completion of the ejection, if it is determined in step 11 that there is no reload command,
Subsequently, it is determined whether the disk 3 has been removed from the slot position (step
14). The removal of the disk 3 is caused by the OFF output of the disk detection switch 11.
Can be detected. At step 14, it is determined that the disk 3 has been removed from the slot position.
At this point, the TOC information stored in the RAM 21 is invalidated (step 1).
5) Set an invalid flag. By the above, loading, performance and eject
A series of operations ends. In the above-described series of operations, when the ejection work of the disc 3 is completed
Does not invalidate the TOC information stored in the RAM 21,
Since it is invalidated only when it is removed from the
If you continue to play the disc you just played, you do not need to read the TOC information again.
Therefore, it is possible to smoothly shift to the performance operation. Next, the focus mode (step 4) in FIG.
This will be explained according to the chart. The CPU 20 first performs a focusing operation on the focus servo circuit 28.
A start command is issued (step 20), and at the same time, a predetermined time Ta
Is started (step 21). And the focus servo is locked.
It is determined whether or not a lock-in has been made (step 22). If the lock-in has been made, the timer is cleared (step 23), and then the process returns to the main flow of FIG. Note that four
Whether the servo is locked in or not depends on whether the focus servo is locked in.
The lock-in signal generated from the focus servo circuit 28 when the
Enabled by: If it is determined in step 22 that the lock-in has not been performed, a predetermined time Ta elapses.
It is determined whether or not the playback time has elapsed (step 24).
Loaded via the motor drive circuit 30 to eject the loaded disc.
An ejection command is issued to the motor 7 (step 25). That is,
If the focus cannot be obtained due to the disk being inserted upside down, etc.
The disk is ejected after a has elapsed. After the eject command, there is a reload command by a key input or the like in the operation key group 5.
(Step 26), and if there is no reload command, eject
Completion is detected (step 27), and the operation is stopped after that. Also,
If it is determined in step 26 that there is a reload command,
Ignore the input (step 28), and then proceed to step 27. That is, if the disc cannot be focused because the disc is inserted upside down, etc.
During a disk eject, the reload command is ignored by the user.
Complete the ejection of the disc, so you can see and use a completely ejected disc
Recognizes why the disc cannot be locked in, such as a disc being inserted upside down
You can do it. Next, the display mode (step 6) in FIG.
Explanation will be given according to the In the main flow of FIG. 6, reading of the TOC information is started (step 5), and
After a while, the display mode is entered. From the start of reading the TOC information, predetermined information is displayed on the display 24, for example, a 7-segment display as shown in FIG.
Flashing display of "----" is performed using one segment at the center of step (step 30).
), When the reading of the TOC information is completed (step 31),
A timer for a given time Tb (for example, 5 seconds) is started (step 32).
The TOC information read at the time, 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 play mode are shown as separate modes, but TOC information is displayed in display mode.
After the reading, the play operation is started. Normally, after the loading of the disc is completed, the TOC information is read and the operation proceeds to the play operation.
At the time of so-called set-up, the TOC information is still read
No data can be displayed on the display 24 and nothing can be displayed.
The player may not be able to determine what operating state the player is in. However
However, as described above, it is possible to display something even without the TOC information.
Thus, the user can be notified that the player is in the setup state.
In this case, the display information in this case is indicated by “−−−−” using a 7-segment display.
The display is not limited to the blinking display. In a state where the number of songs, the total absolute time, and the like are displayed, the track in the operation key group 5 is displayed.
When detecting that another mode is specified by key input of ±, FF, REV, etc.
In this case (step 34), the timer is cleared (step 35), and
Performance (reproduction) status information based on the read information of the pickup 14 that is reproducing the music area.
Information, that is, track number (track number), elapsed time (minutes, seconds)
) Is displayed (step 36). These performance status information are stored in a so-called CD format.
Format is recorded on the Q channel of the subcode signal in the format.
Can be detected from the read information of the loop 14. In addition, the number of songs and the total absolute time are displayed.
In the state, there is no other mode designation and the display state has passed for a certain time Tb.
If it is determined that the performance state has been reached (step 37), the process proceeds to step 36, where
Switch to information display. That is, the read TOC information is displayed for a fixed time Tb,
If another mode is specified before b elapses, the performance status information is displayed at that time.
Automatically switches to the display of performance status information after a certain time Tb has elapsed.
I know. Next, the operation when the focus is lost during the play is shown in the flowchart of FIG.
Explanation will be given according to the The CPU 20 outputs a lock-in state of the servo loop from the focus servo circuit 28.
The lock-in signal generated at the time is constantly monitored in a predetermined cycle.
When it is detected that it has disappeared, it is determined that the focus has been lost, and the focus servo circuit is turned off.
A command to start the focusing operation is issued to the road 28 (step 40).
A timer for a fixed time Tc built in the PU 20 is started (step 41).
. Then, a disc eject command by key input in the operation key group 24 or
It is determined whether a stop command has been issued (step 42).
It is determined whether or not the cas servo has locked in (step 43). Focus sa
When the servo is locked in, that is, when the focus is taken, the timer is cleared (step
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 a certain time Tc (step
45) At that time, the focusing operation could not be performed at this time (
NG counter built in CPU 20 is incremented as focus NG)
(Step 46). Then, the count value N of this counter is a predetermined value, for example,
It is determined whether or not "16" has been reached (step 47).
Return to Step 40 and perform the focusing operation again until the focus is obtained.
The focusing operation is repeated continuously for approximately 16 times. 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 means that the disc is
This refers to a state in which the power is cut off and each mechanism stops operating. Operation in this stop state
When it is detected that a play command is issued by a key input in the operation key group 5 (
Step 50), the process proceeds to step 40, and the focusing operation is started again. As described above, by limiting the number of times the focusing operation is repeated continuously,
And reduce the load on the servo system including the focus actuator, etc.
In addition, heat generation of the pickup 14 can be prevented. Further, during the focusing operation, there is a disc eject command or a stop command.
If it has (Step 42), the process goes to Step 48 to clear the NG counter.
Then, the state is stopped. If there is a disc eject command
The state shifts to the disc eject operation via the stop state. Like this
Clears the NG counter when there is a squeeze command or stop command
By moving from the stop state to the play state, the focusing operation again
Focusing up to 16 times in a row until focus is achieved
The operation can be repeated. Next, as a special operation, the accessory switch of the car was turned off during play.
The operation in this case 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 main power supply (Acc) is detected to be disconnected by the detection output (step 60).
) Then, it is determined whether or not there is an ejection command by a key input with the operation key group 5.
(Step 61), if there is an eject command, the disc at the playback position
To the loading motor 7 via the motor drive circuit 30 to eject
Issue an ejection command (step 62). Operation key group 5 after eject command
It is determined whether or not there is a reload command by a key input or the like in step (step 63). If there is no reload command, the ejection completion is detected (step 64).
Thereafter, the operation is stopped. Also, in step 63, a reload command is
If it is determined that the key is pressed, the key input for the command is ignored (step 65).
Then, the process proceeds to step 64. That is, while the disk is being ejected due to the interruption of the main power supply,
Does not accept the reload command, and shifts from the eject operation to the reload operation.
Is forbidden. As a result, the loading operation and the ejection operation are repeated.
Without being returned, the battery voltage can be prevented from lowering. As described above, according to the auto-loading disc player of the present invention,
If the disc cannot be focused because the disc has been inserted upside down,
During the disc ejection, the user does not issue a disc loading command from the operation unit.
Completes the ejection of the disc from the
Can be locked in, such as when the user inserts the disc upside down.
You can recognize the cause.

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 in-vehicle 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 a 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 a CPU. FIG. 7 is a flowchart illustrating a focus mode. FIG. 8 is a flowchart showing a display mode. FIG. 9 is a flowchart showing 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. [Description of Signs] 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)

Claims: 1. A loading mechanism for transporting a disk between a slot position of a housing and a reproduction position in the housing, and a detecting means for detecting that a disk has been set at the slot position. An operation unit for giving a disk loading or unloading command; a controller for controlling the loading mechanism to load or unload a disk in response to a disk loading or unloading command from the operation unit; and the playback position. An optical pickup for reading recorded information of the disc, and a focus servo circuit for controlling a focusing operation of the pickup and supplying a lock-in signal to the controller at lock-in. A disk based on the output of To control the loading mechanism, when the Rokkuin signal from the disk loading end within a predetermined time period is not supplied automatically controls the loading mechanism in order to unloading the disc, from the operation unit during the control An auto-loading disc player which does not accept a disc loading command.