JPH0718013Y2 - Disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention comprises an optical pickup for irradiating and receiving light on an optical disc, and a pickup movement drive unit for moving the optical pickup in the radial direction of the optical disc. Disc player.

[Prior Art] As a conventional disc player, there is a disc player having a configuration shown in FIGS. 4 (a) and 4 (b).

The figure shows a state in which the internal mechanism is taken out from the disc player. The figures (a) and (b) are bottom views, respectively.
It is a top view.

The disc player shown in FIGS. 1A and 1B is an optical pickup 2 for irradiating and receiving light on the inserted optical disc 1, and a pickup movement drive for moving the optical pickup 2 in the radial direction of the optical disc 1. And part 3. Incidentally, the reference numeral 9 in the figure indicates the optical disc 1.
Is a motor arranged coaxially with the center of rotation 0 for rotating, and reference numeral 8 is its clamper.

The optical pickup 2 is provided with an optical system including an objective lens 7 for emitting and receiving light on the upper surface side.

The pickup movement driving unit 3 includes a screw member 5, a motor 4 for rotating the screw member 5 via a gear 5a fixed to one end of the screw member 5, a guide member 6 for guiding the movement of the optical pickup 2, and the like. It is configured. With this configuration, the optical pickup 2 can be moved in the arrow A direction.

By the way, in the above-mentioned conventional disc player, the optical pickup 2 is moved to the vicinity of the rotation center 0 when the optical disc 1 is not inserted or when the reading and writing of the recorded data are completed. . This is because the index data (tok data) is written at the innermost position of the optical disc 1.

[Problems to be Solved by the Invention] In this type of disc player, a drive control unit (controller) for driving and controlling a motor 4 for moving the optical pickup 2 is provided. However, this drive control unit is for giving a predetermined drive instruction to the motor 4 when a disc is loaded and reproduction is performed, and when the disc is not loaded or reproduction is stopped. In the state, the control operation of the drive control unit is stopped. Therefore,
At this time, the power of the motor 4 is used to make the optical pickup 2
Can not be moved.

Further, in the maintenance of the disc player, it may be necessary to remove dirt on the objective lens 7 of the optical pickup 2. As shown in FIG. 4B, depending on the disc player, when the optical pickup 2 is stopped at the innermost position, the objective lens 7 is hidden inside the chassis and the objective lens 7 needs to be cleaned. In doing so, it may be necessary to move the optical pickup 2 to a position where the objective lens 7 can be exposed from the chassis.

At this time, the optical pickup 2 cannot be moved by the power of the motor 4 as described above. Therefore, the gear 5a shown in FIG. 4 (a) is gradually rotated with the fingertip to move the optical pickup, and the work is very complicated.

Further, in maintenance, it may be necessary to inspect the power transmission path of the motor 4 and how the optical pickup 2 is driven and moved by the power of the motor 4. Even in such a case, the motor 4 cannot be operated, so that the power supply circuit device for maintenance must be separately provided to start the motor 4.

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a disc player in which an optical pickup can be arbitrarily moved by a motor when a disc is not loaded or the disc is not being driven. Is intended to provide.

[Means for Solving the Problems] According to the present invention, an optical pickup that faces an optical disc, a motor that moves the optical pickup in the radial direction of the optical disc, a driver that operates the motor, and a driver that controls the driver when the disc is driven. In a disc player provided with a drive control unit, an input unit for inputting an instruction to arbitrarily move the optical pickup, a power supply unit for supplying a constant voltage, and an instruction to move the optical pickup to the input unit. In some cases, a switching unit is provided that directly connects the power supply unit and the driver.

[Operation] In the above means, when the disk is driven, the motor is driven by the driver under the control of the drive control unit, the optical pickup is moved, and the reproducing operation and the search operation are performed. When it is necessary to move the optical pickup for maintenance or the like when the disc is not loaded or the drive of the disc is stopped, an instruction input for moving the optical pickup is input to the input unit. At this time, the switching unit directly connects the driver and the power supply unit, and a constant voltage is applied to the driver. Therefore, the motor is driven at a constant speed and the optical pickup moves. Then, the optical pickup can be moved to an arbitrary position and the objective lens can be cleaned at that position. Alternatively, it becomes possible to inspect the power transmission path of the motor and the moving state of the optical pickup.

Embodiment Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a circuit configuration as one embodiment,
2A and 2B show the mechanical structure. FIG. 2A is a top view and FIG. 2B is a bottom view.

The disc player shown in FIGS. 1 and 2 comprises a spindle motor 11 for rotating the optical disc 10, a spindle motor drive unit 34 for driving the spindle motor 11, and an objective for irradiating and receiving a light beam on the optical disc 10. An optical pickup 14 having a lens 14a on the upper surface side, a detection unit 36 that detects the presence or absence of the optical disc 10, and a focus control unit that causes the emitted light beam to follow the shake of the surface of the optical disc 10.
31, a tracking control unit 32 that causes the light beam to follow the shake of the track, a signal processing unit 30 that processes the signal read by the optical pickup 14, and a system controller 25 that has a function as a control center of this device. A pickup movement drive unit 33 for moving the optical pickup 14 in the radial direction of the optical disc 10, a display unit 26 for displaying various information, and an input unit 27 for inputting movement instruction information for moving the optical pickup 14 to an arbitrary position. It has and.

The signal processing unit 30 amplifies the detection signal output from the optical pickup 14, and outputs a focus error signal to the focus control unit 31, the tracking control unit 32, and the spindle motor drive unit 34 connected to the output side. An RF amplifier 21 that outputs a tracking error signal and a spindle control signal, a signal processing circuit 22 that corrects the digital data recorded on the optical disk 10 that is output from the RF amplifier 21, and the corrected digital data. Is provided with a D / A conversion circuit 23 for converting the analog signal into analog data, and an audio circuit 24 for converting the analogized detection signal into an audio signal and outputting the audio signal to the subsequent stage.

The tracking control unit 32, based on the input tracking error signal, a tracking servo circuit 19 that generates a correction signal that causes the light beam emitted from the objective lens 14a to follow the shake of the track, and an optical signal based on this correction signal. A tracking driver 16 for correcting and driving the pickup 14 is provided.

The focus control unit 31 generates a correction signal for causing the light beam emitted from the objective lens 14a to follow the shake of the surface of the optical disc 10 based on the input focus error signal, and a focus servo circuit 18 for correcting the correction signal. Focus driver that corrects and drives the optical pickup based on
It has 15 and.

The pickup movement drive unit 33 is based on a control signal output from a system controller 25, the details of which will be described later.
Between the sled servo circuit 20 that generates a coarse movement signal in the direction of arrow A of the optical pickup 14, the sled driver 17 that coarsely moves the optical pickup 14 by this coarse movement signal, and the sled driver 17 and the sled servo circuit 20. And a switching unit 29 that is interposed in the.

In FIGS. 2A and 2B, the reference numeral 37 indicates a motor for coarsely moving the optical pickup 14, the reference numeral 38 indicates a screw member rotated by the motor 37, and the reference numeral 39 indicates the optical pickup 14 by an arrow A. Reference numeral 40 is a clamper for the optical disc 10, which slides and supports in the direction.

When a disc is loaded and playback is performed,
The drive control unit including the system controller 25 and the sled servo circuit 20 controls the sled driver 17, drives the motor 37, and moves the optical pickup 14.

As shown in FIG. 1, the switching unit 29 is capable of directly connecting and switching the power supply unit 28 for applying a constant voltage power to the thread driver 17, and has two fixed terminals 29.
a and 29b, and a movable terminal 29c that is rockably driven between the fixed terminals 29a and 29b by a control signal output from the system controller 25. Of these, the fixed terminal 29a has the power supply unit 28, and the fixed terminal 29b has the thread servo circuit 2
0 and the sled driver 17 is connected to the movable terminal 29c.

The spindle motor drive unit 34 includes a spindle servo circuit 13 that generates a rotation correction control signal for the spindle motor 11 based on the input spindle control signal, and a spindle driver 12 that rotates the spindle motor 11 according to the correction control signal. It has and.

The input unit 27 includes various push buttons for operating the optical disc 10, a movement instruction button 27a for generating movement instruction information for moving the optical pickup 14 to an arbitrary position, and stop information for stopping the moving optical pickup 14 at an arbitrary position. And a stop button 27b for generating.

In addition, the movement instruction of the optical pickup 14 is given by the optical disc 10
It is also possible to push a plurality of push buttons that are arbitrarily separated from each other for operating the push buttons.

The system controller 25 includes a CPU (not shown), a ROM 35 in which a plurality of programs for causing the CPU to perform predetermined functions are recorded, and the like. In this embodiment, the system controller 25 has a function as a control center of the entire apparatus described above, and when the detection unit 36 does not detect the optical disk 10 and the movement instruction information is input from the input unit 27, Has a function as a switching control unit that controls switching of the switching unit 29 so that the sled driver 17 of the pickup movement driving unit 33 and the power supply unit 28 are directly connected.

Regarding the operation of the apparatus of the embodiment having the above configuration,
It will be described with reference to the drawings.

First, when the power is turned on, each part in the apparatus is initialized, and the input unit 27 enters a standby state.

Step 1 (ST1): When the movement instruction button 27a provided on the input unit 27 is pressed here, the process proceeds to step 2.

Step 2 (ST2): The presence or absence of the optical disc 10 is detected by the detector 36. If no optical disc is detected here, the process proceeds to step 3, and if detected, the process proceeds to step 4.

Step 3 (ST3): Here, the system controller 25 as a switching control unit sends a switching control signal to the switching unit 29. With this switching control signal, the movable terminal
29c is switched to the fixed terminal 29a side, and the process proceeds to step 5. On the other hand, in step 4, the system controller 25 as the switching control unit rejects the input of the movement instruction information, and the process returns to step 2.

Step 5 (ST5): About −2 for thread driver 17
The voltage of V is applied, and the process proceeds to step 6.

Step 6 (ST6): The sled driver 17 starts moving the optical pickup 14 in the direction of arrow A and away from the center of rotation. Then, the process proceeds to step 7.

Step 7 (ST7): Those who perform maintenance here,
Visually check the movement of the optical pickup 14. After moving to a desired position (here, the position where the objective lens can be confirmed from the outside), the process proceeds to step 8 (ST8) and the stop button 27b is pressed.

By pressing this stop button 27b, the system controller 25
Stop information is entered in. By inputting this stop information, the system controller 25 as a switching control unit switches the movable terminal 29c to the fixed terminal 29b side. As a result, the thread driver 17 stops driving the optical pickup 14. Then, dust and the like attached to the objective lens 14a are removed,
Return the internal mechanism to the inside of the case to finish the work.

According to the present invention described in detail above, even when the optical disc 10 is not inserted, the optical pickup 14 can be moved in the radial direction simply by pressing the movement instruction button 27a. Therefore, it is possible to eliminate the complicated work of moving the optical pickup by rotating the gear or the like little by little with a fingertip as in the related art, and it is possible to shorten the time required for the maintenance work. Therefore, it is possible to significantly improve the maintenance work efficiency.

By the way, as described above, if the instruction to move the optical pickup 14 is made by pressing a plurality of push buttons that are separated from each other among various push buttons that operate the optical disc 10, in addition to the above effects, the user is recorded on the optical disc 14. It is also possible to prevent malfunctions during reproduction of data.

It should be noted that the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist thereof.

[Advantages of the Invention] As described above, in the present invention, by inputting an instruction to move the optical pickup, the driver and the power supply unit that outputs a constant voltage of power are directly connected, and a constant voltage is applied to the driver. Then, the motor can be driven to move the optical pickup. Therefore, even when the disc is not loaded or the reproduction of the disc is stopped, the optical pickup can be arbitrarily moved to efficiently perform maintenance and the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration as one embodiment,
FIG. 2 shows a mechanical configuration. FIG. 2 (a) is a top view, FIG. 2 (b) is a bottom view, FIG. 3 is a flow chart showing the operating state, and FIGS. 4 (a) and 4 (b). [Fig. 3] is a bottom view and a top view showing a state in which the internal mechanism is taken out from the conventional disc player, respectively. 10 ... Optical disk, 14 ... Optical pickup, 25 ... Switching control section, 27 ... Input section, 28 ... Power supply section, 29 ... Switching section, 33 ... Pickup movement driving section, 36 ... Detection section.

Claims (1)

[Scope of utility model registration request] 1. An optical pickup facing an optical disc,
In a disc player provided with a motor for moving the optical pickup in the radial direction of the optical disc, a driver for operating the motor, and a drive control section for controlling the driver when the disc is driven, an instruction for arbitrarily moving the optical pickup is given. An input unit for inputting, a power supply unit for supplying a constant voltage, and a switching unit for directly connecting the power supply unit and the driver when a movement instruction of the optical pickup is input to the input unit are provided. Disc player characterized in that