JPS62259231A - On vehicle disk player - Google Patents

Abstract

PURPOSE:To always attain the restriction of continuous focusing operation by detecting no output of a lock-in signal also after the passage of prescribed time and clearing the contents of a detecting signal counting counter to be transferred to a stop mode in accordance with a disk inject or stop command. CONSTITUTION:When an optical pickup 14 is defocused, focusing operation for feedback control is started through a focus servo circuit 28 or the like and a lock-in signal is supplied from a circuit 29 to a CPU 20 in accordance with leading-in of focus servo. When the CPU 20 detects no generation of the lock-in signal within a prescribed time, a counter built in the CPU 20 counts up the detection signals, and when the count value reaches a prescribed value, the CPU 20 transfers the operation to the stop mode. If a disk inject or stop command is applied through an operation key group 5, the CPU 20 clears the contents of the built-in counter and prepares the succeeding operation processing. Consequently, continuous focusing operation more than the prescribed number of times is always restricted and the pickup is prevented from heating or the like through the focusing actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle-mounted disc player equipped with an optical pickup.

1 and 11 In a vehicle-mounted disc player, the optical pickup may become out of focus due to large vibrations caused by driving the vehicle on rough roads.

In such cases, conventional camera shakers have to repeat the focusing operation continuously until the focus is achieved.
There were problems such as the pickup generating heat due to the continuous flow of the Jffi flow.

1 ■Summer plate 1 The present invention was made in view of the above points, and by limiting the number of times the focusing operation is repeated to 1-1,
An object of the present invention is to provide an on-vehicle disc player 17 that solves problems such as heat generation of a pickup.

The in-vehicle disc player according to the present invention cannot focus even if the focusing operation is repeated a predetermined number of times11! The gate is configured to shift to a stop mode and to clear the count value of a counter that counts the number of focusing operations when a disk eject command or a stop command is issued during a focusing operation.

Support-lid-1 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic perspective view showing the external appearance of a slot-in type vehicle-mounted autoloading 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 extending in the left-right direction in the figure for inserting a disc 3 to be played. For example, the audio information on the disc 3 is PCM (Pulse Code Modulati
This is a so-called compact disc that is recorded using a 3D (on) system, and its outer diameter is approximately 12 Cffl. A plurality of operation keys are further arranged on the front panel 2 to issue various operation commands to the disc player, such as play start, disc eject, etc., and these keys constitute an operation key group 5. There is.

In FIG. 2, disk 3 inserted from slot 4
is positioned at a predetermined position (hereinafter referred to as a slot position) on the tray 6 by a positioning means (not shown), and the disk 3 is supported on the tray 6 with a part of it protruding outside the front panel 2. Tray 6 is driven by 0-
The supported disk 3 is moved between the slot position and the housing 1 by a driving motor 7 and a driving force transmission mechanism 8 that transmits 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 figure. It constitutes a loading mechanism for conveying between the playback position and the playback position mentioned above.

In such a loading mechanism, the tray 6 carries the disk 3 set in the slot position and moves rightward from the solid line position in the figure, and the center hole of the disk 3 is fixed to the turntable of the spindle motor 9. When it reaches the top of the turntable 10, it descends directly below, places the disc 3 on the turntable 10, descends further, and stops at a distance of wi from the disc surface, as shown by the two-dot chain line in the figure. , The above series of operations performs the loading operation of the disc 3.The disc 3 is loaded onto the turntable 10.
The position placed above becomes the playback position described above. Also,
The ejecting operation of the disk 3 is performed by the reverse rotation of the loading motor 7, following a path completely opposite to that of the above-mentioned 0-loading operation. The above-mentioned loading mechanism has been filed by the applicant in Japanese Patent Application Nos. 59-200145 to 200153, and a detailed explanation of its structure and operation can be found at:
It will not be detailed here.

Various detection switches are provided within the housing 1. First, a disk detection switch 11 is provided to detect that the disk 3 is in the slot position.This disk detection switch 11 is turned on when the disk 3 is set in the slot position, and the disk 3 is not handled from that position. When removed, it turns off. The loading completion detection switch 12 is turned on by engaging the tray 6 after the disc 3 is placed on the turntable 10, and detects that the loading operation is completed. Further, the ejection completion detection switch 13 is
Ijieku I by the loading mechanism・The most forward position during operation (
By engaging with the tray 6 that has reached the front panel 2 side) position, it is turned on, and it is detected that the ejecting operation has been completed.

A disk 3 placed on a turntable 10 is rotationally driven by a spindle motor 9, and the recorded information is read by a Kogaku type beater 14. The pickup 14 is mounted on a main 11 carriage (not shown) that is movable in the radial direction of the disk j, and the four carriages are driven by a carriage motor 15 via a gear mechanism 16. A group of operation keys 5 arranged on the front panel 2 and the above-mentioned detection switches 11 to 1
Each signal emitted from the housing 1 is transmitted to a control system shown in FIG.

FIG. 3 shows the configuration of the control system, which consists of a microcomputer consisting of a CPU (central processing unit) 20 as the center of control, a RAM (random access memory) 21 as a storage means, etc. The structure is as follows. The CPLI20 includes a group of operation keys 5 and each detection switch 1.
The spindle servo circuit 22 controls the rotational speed of the spindle motor 9 based on each signal emitted from 1 to 13, etc., and the rotational speed of the carriage motor 15.
Control signals are generated at timings described later for the carriage servo circuit 23 and the motor drive circuit 30 that drives the loading motor 7, and display data is output to the display 24 that displays various displays.

The read information taken from the disc 3 by the pickup 1/l is subjected to signal processing such as demodulation and error correction in the signal processing circuit 25, and then supplied to the CPU 20.
It is converted into analog information by a D/A (digital/analog) converter 26, passed through an electronic volume circuit 27, and then sent to the left (
) and output as a right (R) channel audio signal. Further, a focus servo circuit 28 controls the position of the condensing point of the information reading spot emitted from the pickup 14 and converged on the recording surface of the disc 3 in the vertical direction with respect to the recording surface, and a focus servo circuit 28 that controls the position of the focal point of the information reading spot emitted from the pickup 14 and converged on the recording surface of the disc 3; An i-racking servo circuit 29 is provided to control the position of the read spot in the disk radial direction.

The focus servo circuit 28 controls the pickup 14 to perform a focusing operation in response to a command issued from the CPLJ 20 at the start of playback or when the focus is lost during playback, and during normal playback, the focus servo circuit 28 controls the focusing operation of the pickup 14 to eliminate astigmatism. A focus actuator (not shown) built into the pickup 14 is driven and controlled based on a focus error signal generated by a well-known detection method such as
When the force 3 servo locks in when it is retracted, a lock-in signal is sent to the CPLJ20. On the other hand, the tracking servo circuit 29 is an I
・A drive signal is supplied to the racking actuator (not shown) in response to a command issued from the CPU 20 during a jump, etc., and a tracking error signal generated by a well-known detection method such as the three-beam method during normal playback is supplied to the racking actuator (not shown). By supplying the information, the position of the information reading point in the disk radial direction is controlled. Note that 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 the apricot disc player is installed in a vehicle, the CPU 20 is operated by a backup power source, and each mechanical section is configured to operate by main power supplied by turning on a so-called accessory switch (not shown) of the automobile. However, among the mechanical parts, only the loading mechanism including the loading motor 7 and its drive circuit 30 is powered by a backup power source so that the disk 3 taken into the housing 1 can be ejected even if the main power is turned off. It's supposed to work. An ACC detection circuit 31 is provided for detecting disconnection of the main power supply, and this ACC detection circuit 31 supplies a detection signal to the CPU 20 when the main power supply is disconnected.

As shown in FIG. 4, each key in the operation key group 5 includes a volume IIIPJ key 50 and a volume rDO key 50, which command the increase (UP) and decrease (DOWN) of Sm.
WNJ key 51, balance "L" key 52 and balance 1゛R for balancing the sound m of the left and right channels
” key 53 is included. Processing when these keys are operated is performed by software by the CPLI 20. That is, the CPLJ 20 provides the electronic volume circuit 27 with the volume IUPJ key 50 or the volume r
When the DOWNJ key 51 is operated, data and clocks are sent to simultaneously increase or decrease the Sb of both left and right channels, and when the balance rLJ key 52 or balance rRJ key 53 is operated, the sound range of one channel is sent out. Data and clocks are sent to increase the volume of the other channel and decrease the volume of the other channel, and the detailed processing method will be described later. Sound 8 at this time
The state of change is displayed on the display 24.

Note that the electronic volume circuit 27 includes, for example, a plurality of resistors connected in series with each other and a plurality of analog switches connected in parallel to each of these resistors. A well-known structure that controls sound damage by turning it on and off can be used.

Volume III IPJ key 50 and volume rDOW
The NJ keys 51 each have the function of instructing the increase and decrease of & as described above, and both keys 50.5
What if 1 was manipulated twice? '3 ffi for example 2
0d[3ft! ! It also has the function of issuing commands to lower the temperature at once.

Next, the operating procedure of this automatic O-ding disc play%t executed by the CPU 20 will be explained in FIGS. 6 to 1.
A brief explanation will be given in accordance with the playback order while referring to the flowchart in FIG.

First, the series of operations of O-ding, playing, and ejecting will be explained according to the flowchart of FIG. 6. Disc 3 is in the slot. - When the disc is inserted into the housing 1 from 4 and set in the slot position on the tray 6 as shown in FIG. 2, the disc detection switch 11 is turned on. C
When the PU 20 detects that the disk detection switch 11 is turned on (step 1), it issues a loading command to the loading motor 7 via the motor drive circuit 30. As a result, the O-ding motor 7 rotates, the loading mechanism is activated, and the loading operation is started (step 2). When the tray 6 carrying the disk 3 moves to the right from the device A shown in solid lines in FIG. As shown, the disk 3 is placed on the turntable 10, and the above series of operations completes the loading operation. At this time, the loading completion detection switch 12 is turned on. CPU2
0 detects the completion of loading by the on output of this loading completion detection switch 12 (step 3).
, shift to focus mode for focusing the pickup 14 (step 4)
. This focus mode will be described later.

When the focus is taken in the focus mode, the reading operation of the pickup 14 is started, but before reading the program area, the reading of the recorded information in the lead-in area of the disc 3 is first started (Step 5), and then A transition is made to the play mode (step 7) via the display mode (step 6). TOC read
Information is stored in RAM21. In the lead-in area of the disc, there is a so-called TOC (Table
e Of Contents) information is recorded,
Performance 1! ! It is necessary to read this TOC information before starting. In play mode, in addition to normal sequential performance, you can select program songs, scan, search, etc. l1ift is performed.

When the performance ends and the carriage (not shown) carrying the pickup 14 reaches its travel limit position and a detection switch (not shown) is turned on, at this point the CPLJ 20 detects that the performance has ended (step 8). Eject I to the loading motor 7 via the motor drive circuit 3o.
・Issue a command. As a result, the 0-ding motor 7 rotates in the opposite direction to that during the loading operation and starts the ejecting operation (step 9) □. In this ejecting operation, the tray 6 carries out the disk 3 to the slot position in a reproducing position by following the completely opposite process to the loading operation described above, and the tray 6 moves to the frontmost position (not shown by the solid line in FIG. 2). When the ejection operation is completed, the ejection completion detection switch 13 is turned on.

When the CPU 20 detects the ejection completion by the ON output of the ejection completion detection switch 13 (step 10), the CPU 20 then determines whether or not there is an O-do command by human input to the operation key group 5. Step 11)
, if there is a reload command, the motor drive circuit 3 is reloaded.
0 to the loading motor 7 to start the loading operation (step 1
2).

When the completion of the O-ding operation is detected (step 13)
, the CPU 20 is playing the same disc as last time,
Since the TOC information is stored in the RAM 21 and is valid, control is performed so as not to immediately shift to the play mode (step 7) without reading the TOC information.

After the ejection is completed, if it is determined in step 11 that there is no O-do command, then it is determined whether the disk 3 has been removed from the slot position (step 14).

To handle this disk 3, use the disk detection switch 11.
It can be detected by the off output of When it is determined in step 14 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 I-valid flag is set. With the above steps, the series of operations of loading, playing, and ejecting is completed.

In the series of operations described above, the TOC information stored in the RAM 21 is not invalidated when the disk 3 eject operation is completed, but is invalidated only when the disk 3 is removed from the slot position. Therefore, when the ejected disc is to be played again, there is no need to read the TOC information again, and the playing operation can be smoothly performed.

Next, focus mode (step 4) in Fig. 6
will be explained according to the flowchart of FIG.

First, the CPU 20 issues a command to start the focusing operation to the focus servo circuit 28 (step 20).
At the same time, a timer for a certain period of time Ta built in the CPU 20 is started (step 21). Then, in step 2, determine whether the focus servo is locked in or not.
2) If the lock-in occurs, clear the timer and return to the main 70- in FIG. 5 after completing step 23).

Note that it is possible to determine whether or not the focus servo is locked in by using a lock-in signal generated from the focus servo circuit 28 when the focus servo is locked in.

If it is determined in step 22 that lock-in is not achieved, it is determined whether or not a certain period of time Ta has elapsed (step 24). If the predetermined time Ta has elapsed, the motor is Drive circuit 30
An eject command is issued to the loading motor 7 via the (step 25). That is, if the focus cannot be achieved due to scratches or dirt on the disc, or because the disc has been inserted for re-insertion, the disc is ejected after a certain period of time Ta has elapsed.

In step 26, it is determined whether or not there is a manual reload command in the eject command pattern and the keys in the operation key group 5.
), if there is no O-do command, the completion of ejection is detected (step 27), and the operation is stopped thereafter. If it is determined in step 26 that there is a reload command, the key input for that command is ignored and the process proceeds to step 28), followed by step 27.

In other words, if the focus cannot be taken due to scratches or dirt on the disc, or the disc is inserted upside down, and the disc is being ejected, the disc loading command is not received, and the ejecting operation shifts to the loading operation. It is prohibited. This allows the user to quickly determine if the disc is inserted upside down, and prevents the disc from being played if the disc is scratched or dirty.

Next, the display mode (step 6) in FIG. 6 will be explained according to the flowchart in FIG. 8.

In the main flow shown in Figure 6, TOC information is read in step 1.
After that, in step 5), the main display mode is entered, and from the beginning of reading the 10C information, predetermined information is displayed on the disk display 24, for example, a 7-segment 1-display as shown in FIG. Step 30: Use one segment in the center to display r---J blinking.
), when reading of the TOOff'i information is completed (step 31), a certain period of time Tb built in the CPLJ20
(for example, 5 seconds) (step 3).
2) Display the TOC information read at the same time, ie, the number of songs, absolute time, etc. (step 33). In addition, the 6th
In the flowchart shown in the figure, the display mode and the play mode are shown as separate modes for convenience of explanation, but after reading the TOC information in the display mode, the play operation begins.

Normally, during the so-called set-up period, which is the time when the TOC information is read after the disc has been loaded and the play operation begins, the TOC information has not yet been read and there is no data that can be displayed on the display 24, so nothing can be displayed. What operating state is the player in? There are cases where l1lli cannot be performed. However, as described above, even if there is no TOC information, by displaying something, it is possible to notify the user that the player is in the 1-up state. In addition, the display information in this case is r-
The display is not limited to the blinking display of m--J.

If it is detected that another mode has been manually designated by keys such as track operator, FF, REV, etc. in the operation key group 5 while the number of songs, absolute time, etc. are being displayed, step 34) Clear the timer Step 35)
At the same time, performance (playback) status information, that is, track number (
The track number), the elapsed time (minutes, 0 seconds) from the start of the performance of each song, etc. are displayed (step 36).

This performance status information is recorded in the Q channel of the subcode signal in the so-called CD format h, and can be detected from the information read by the pickup 14. Further, in a state in which the number of songs, absolute time, etc. are displayed, if there is no other mode specification and it is determined that the display state has elapsed for a certain period of time Tb (step 37), the process moves to step 36 and the above-mentioned Switch to the display of performance status information.

That is, the read TOC information is displayed for a certain period of time Tb, and if the Haku mode is specified before the elapse of the certain period of time Tb, the display switches to the performance status information at that point, and Tb is displayed for a certain period of time. When the time has elapsed, the display automatically switches to the performance status information.

Next, the operation when the focus goes out during play will be explained according to the flowchart of FIG. 9.

The CPU 20 constantly monitors the lock-in signal generated from the focus servo circuit 28 in the lock-in state of the servo loop in a predetermined cycle, and when it detects that the lock-in signal disappears, it determines that the focus has been lost, and the focus servo circuit A command to start the focusing operation is issued to the CPLI 28 (step 40), and at the same time, a timer for a fixed time Tc built in the CPLI 20 is started (step 41). Then, it is determined whether or not there is a manual disc eject I-command or a stop command in the operation key group 24 (step 42), and if there is no disc ejection command, it is determined whether the focus servo is locked in (step 42). 43). When the focus servo is locked in, that is, when the focus is achieved, the timer is cleared (step 44), and the play operation is then started again. If the lock-in signal of the focus servo is not obtained within the fixed time Tb (step 45), the focus cannot be obtained in the current focusing operation at that point.

(Focus NG) NG built into Toshi7qPU20
The counter is incremented by 1 (step 46). Then, it is determined whether the count iUN of this counter has reached a predetermined value, for example, "16" (step 47), N
If ≠16, return to step 40 and perform the focusing operation again, and focus up to 16 until focus is achieved.
Repeat the focusing operation several times in succession.

If focus cannot be obtained even after repeating the focusing operation 16 times in a row, 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 disc is at the playback position, the main power is cut off, and each mechanical section stops operating. In this stopped state, operate key group 5.
When it is detected that a play command has been issued by the key operator (step 50), the process moves to step 40 and the focusing operation is started again.

In this way, by limiting the number of consecutive focusing operations, it is possible to reduce the load on the servo system including the focus actuator and the like, and to prevent the pickup 14 from generating heat.

Furthermore, if a disc eject command or stop command is issued during the focusing operation (step 42),
The process moves to step 48, where the NG counter is cleared, and then the process is brought to a stop state.

Note that if there is a disc eject command, the process goes through the stop state and moves to a disc eject operation t1. By clearing the NG counter when an eject command or a stop command is issued in this way, even if you move from the stop state to the play state and perform the focusing operation again, it will take up to 16 consecutive operations until the focus is achieved. This means that the focusing action can be repeated.

Next, as a special operation, the operation when the accelerator switch during automatic play I15 is turned off is explained in the 10th section.
The explanation will be given according to the flowchart shown in the figure.

The CPU 20 constantly monitors the detection output of the ACC detection circuit 31 in a predetermined cycle, and when the main power source (ACC) is detected based on the detection output (step 60), the CPU 20 then manually presses the key in the operation key group 5. If there is an eject command, the loading motor 7 is controlled via the motor drive circuit 30 in order to eject the disc at the playback position (Step 61). ~ Issue a command (step 62)
. Eject 1n From now on, it will be determined whether or not there is an old command to reload the keys manually in the operation key group 5 (step 63), and if there is no O-do command, the ejection completion will be detected in step 64), and thereafter. is in a stopped state. If it is determined in step 63 that there is a reload command, the key input for that command is ignored and the process proceeds to step 65), followed by step 64.

In other words, while the disk is being ejected due to the main power being cut off, the disk paste load command will not be accepted.
This prohibits the transition from the ejecting operation to the O-ding operation. This prevents the battery voltage from decreasing without repeating the O-ding operation and the reset operation f'l'.

Next, press the operation key 5 to turn the volume [UPJ, r
DOWNJ key 50.51 and balance rLJ, rRJ
A key processing method executed by the CPU 20 when the keys 52 and 53 are operated will be described.

First, volume 1°tJPJ, rD'0WNJ key 5
In the case of 0.51, these keys are as mentioned above.
Each has the function of issuing commands to increase and decrease the elicitation, and when both keys are operated together (so-called double press), it also has the function of issuing a command to lower the interval by about 20Ilf3 at once. The key processing method will be explained below with reference to the flowchart shown in FIG.

The CPU 20 constantly monitors in a predetermined cycle whether or not any □ key in the operation key group 5 has been pressed (Step 70), and if any key has been pressed, the key is It is determined whether the key is the same as that used in (step 71). If the key is different from the previous key, the chattering counter built in the CPIJ20 is set to 1-star (step 72), and then the CPU20
Step 73 to clear the double press timer built into the
), and further turns off the double press check flag (step 74). Note that the chattering counter is a counter to absorb chattering during key operation to prevent malfunctions, the double press timer is a timer for monitoring 2m key presses, and the 2m press check flag G and L are operated. This flag indicates that the key is a double-press key.

If it is determined in step 71 that it is the same key as last time, it is determined whether the chattering counter has exceeded 1 to 1 (step 75), and if it has exceeded it, it is determined whether the 2flf check flag is on or not. (step 76). In the previous cycle, step 74
Since the double press check flag is turned off in step 77), it is determined whether the key being pressed is a double press key (step 77), and if it is a double press key, Start the 2m press timer (step 78), and turn on the double press check flag (step 79).
).

In this way, the double press timer is started when either of the two double press keys is pressed, and during the operation period of the timer, it is determined in step 70 that the key is not pressed, that is, the key is released. If it is determined that the double press check flag is on (step 80), then the key is made valid (step 81).

Similarly, during the operation period of the double-press timer, it is determined whether the timer has timed out or not through step 76. If the timer has timed out (step 82), 1, which is pressed at that time, is enabled. (Step 8
1). Also, if the time is not over, the key is 2.
Step 83), 2 to determine whether or not it is being pressed heavily.
If the keys have been pressed multiple times, the process proceeds to step 81, where both keys are made valid and the double press is marked with a serial number.

That is, the CPLJ20 operates a double press timer when a double press key is pressed, and during the timer operation period, either of the two double press keys is pressed. When the key is released, the key is accepted by detecting that the key has been released, and when both keys are pressed together, it is accepted as 2ffi press, and when the timer operation period has passed, either of the two keys is accepted. When a key is being pressed, the process of placing that key on the receiver is performed. After receiving each key, data and a clock are sent to the electronic volume 27 (see FIG. 4) to execute the function of each key or the double press function.

In this way, by providing a double press timer and detecting that one key has been pressed and then pressed during the timer's operating period, it is possible to perform one key process even during the timer's operating period. , it is possible to quickly respond to rapid repeated key operations.

In this embodiment, as a key processing method for double-pressing keys, volume IUPJ, f[0WNJ key 5
Although the case of 0.51 has been described, b is not limited to these keys. Furthermore, the applicable equipment is not limited to the present disc brake V.

Next, a processing method for adjusting the gl balance of the left and right channels by using the balance rLJ and RJ main keys 2 and 53 will be explained according to flowchart 1 in FIG.

The CPU 20 constantly monitors in a predetermined cycle whether or not any key in the operation key group 5 has been pressed, and if it has been pressed, the key is the balance "shi" or rRJ key 5.
2 or 53 (step 90).

When any key is pressed, key identification data corresponding to that key is stored in a register built into the CPtJ20. If neither the balance rLJ nor the rRJ key 52 or 53 is present, the register is reset (step 91), and the process waits for L cycles.

If it is determined that the balance "SH" or rRJ key 52 or 53 is pressed in step 90, the key identification data stored in the previous register and the current key identification data are compared. is the same key as in the previous cycle (step 92).
. Based on this judgment, it is possible to determine whether the same key is being pressed continuously. If not pressed continuously,
Change the key identification data of the register (step 93)
Then, it is determined whether the key is the balance rLJ key 52 (step 94). If the balance "L" key 52 is selected, the electronic volume 27 is used to increase the 8G of the L channel 1 channel and decrease the R channel sound 3.
(Step 95) to send data and a clock to the balance rRJ key 53 (see FIG. 4), and perform the opposite control if it is the balance rRJ key 53 (Step 96).

If it is determined in step 92 that the button is pressed continuously, the left and right keys 1
In step 97), it is determined whether or not the channel Btu is balanced (center balance state). If the channel is not balanced, the process moves to step 94 and the same operation as described above is performed, and if the balance is achieved, At that point, the continuous press will stop attaching. The center balance state can be detected by comparing the left and right channel data sent to the electronic volume circuit 27 and checking whether the two data match.

In this way, if the balance key is pressed continuously and the center balance state is reached, the so-called center click effect can be obtained by stopping the continuous presses at that point. It is possible to check the balance state (q) and also to operate without looking at the display. Therefore, it is especially useful for in-vehicle G1 devices that are often operated without checking the display.

In this embodiment, a case has been described in which the above-described lff1 balance processing method is applied to the electronic volume circuit in the disc player 47, but the invention is not limited to this, and it can be applied to a normal tone control circuit or fader control circuit. It can also be applied to

As explained above, according to the in-vehicle disc player according to the present invention, if focus cannot be achieved even after repeating the focusing operation a predetermined number of times, the servo system This not only reduces the load on the pickup, but also prevents the pickup from generating heat.

In addition, when a disc eject command or stop command is issued during a focusing operation, by clearing the count value of the counter that counts the number of focusing operations, even when performing the focusing operation again afterwards, the number of times the disc eject command or stop command is issued is always the same as the predetermined number of times. This allows the focusing operation to be repeated continuously.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view showing the external appearance of an in-vehicle autoloading disc player according to the present invention, Fig. 2 is a schematic configuration diagram showing its internal structure, and Fig. 3 is a block diagram showing the circuit configuration of the control system. FIG. 4 is a block diagram showing a specific configuration of a part of the circuit in FIG. 3, FIG. 5 is a diagram showing an example of a display method,
FIGS. 6 to 12 are flowcharts 1 showing each operation procedure executed by the CPU. Explanation of symbols of main parts 1... Housing 3... Disc 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

Claims (1)

[Claims] An optical pickup that reads recorded information on the disc,
A vehicle-mounted disc player, comprising a focus servo circuit that controls the focusing operation of the pickup and generates a lock-in signal when locking in, and repeats the focusing operation when the focus is lost during playback. , comprising means for detecting when the lock-in signal is not generated within a predetermined time from the start of the focusing operation and generating a detection signal; and a counter for counting the number of times the detection signal is generated; An on-vehicle disc player characterized in that the disc player shifts to a stop mode when the count value reaches a predetermined value, and clears the count value of the counter when a disc eject command or a stop command is issued during the focusing operation.