JP2946584B2 - Disc playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk player having, for example, a small portable electronic dictionary function, and more particularly to a disk player having reduced power consumption.

B. Summary of the Invention The present invention is a disk reproducing apparatus for making an access request for data recorded on a disk, in a standby state in which no access request to the disk has been issued, continues the tracking servo operation, By turning off the servo power of at least the two-axis actuator when the standby state continuation time reaches a predetermined time, the access time after the release of the standby state can be reduced and the power consumption can be reduced. It is.

C. Prior Art Conventionally, a disc reproducing apparatus that requests access to data on an optical disc on which a spiral track such as a CD-ROM or the like is formed has a problem in that the reproducing operation is temporarily stopped during the standby time of the actuator. The last access position is held by a track jump, that is, for example, by jumping back to the original track every rotation of the disk, thereby increasing the access speed.

D. Problems to be Solved by the Invention However, the above-described conventional disk reproducing apparatus holds the last accessed position by the track jump during the standby time of the actuator in which the reproducing operation is temporarily stopped, and sets the access speed. Since the speed is increased, the jump frequency during the standby operation is high, and the current flowing through the pickup coil for performing the jump operation is large, so that the power consumption is large and the electronic dictionary function is provided. It is not suitable for small portable devices such as disc reproducing devices and portable CD (so-called compact disc) players.

The present invention has been made in view of the above-described problems, and has as its object to provide a disk reproducing apparatus that consumes less power.

E. Means for Solving the Problems In a disk reproducing apparatus according to the present invention, an access request to the disk is generated in a disk reproducing apparatus which requests access to data recorded along a spiral track of the disk. The above-mentioned subject is characterized in that a tracking servo operation is continued in a standby state when the standby state is not performed, a track trace state is maintained, and a servo power supply of at least the two-axis actuator is turned off when the standby state duration time reaches a predetermined time. Solve.

F. Operation The disk reproducing apparatus according to the present invention continues the tracking servo operation in a standby state in which no access request to the disk has been issued, and at least 2 times when the standby state continuation time reaches a predetermined time. The power consumption can be reduced by turning off the servo power supply of the axis actuator.

G. Embodiment Hereinafter, an embodiment of the disk reproducing apparatus according to the present invention will be described with reference to the drawings.

In this embodiment, the disk reproducing apparatus according to the present invention is used for a portable disk reproducing apparatus that reads data recorded on an optical disk, displays the read data on a display unit, and is driven by a battery, for example. Provided.

G-1. Description of Configuration FIG. 1 is a flowchart for explaining an operation for reducing the power consumption of the disk reproducing apparatus according to the present invention. Here, FIG. 2 will be used to explain the above operation. The configuration will be described.

In FIG. 2, a disc reproducing apparatus includes a reproducing system 2 for reproducing data recorded on an optical disk 1, an audio signal processing system 3 mainly for processing an audio signal of the read data, and a And a data processing system 4 for displaying images by performing search processing. The control of each system is performed by one CPU (central processing unit) 5 described later.

In the reproducing system 2, in response to an input from the keyboard 31, the CPU 5 includes a laser light source driving circuit 10, a thread feed motor 11, a two-axis actuator driving circuit 12, and a motor driving circuit.
Control 13 That is, the CPU 5 controls the motor drive circuit 13 to rotationally drive the spindle motor 6 with, for example, CLV (constant linear velocity), CAV (constant angular velocity), or the like. At the same time, the pickup 7 including the objective lens 14, the photodetector, the cylindrical lens, the half-wave plate, and the like constituting the two-axis device is moved (coarsely moved) to a predetermined track on the optical disk 1 by controlling the thread feed motor 11. Controls the radial direction of the disk. By controlling the biaxial actuator drive circuit 12, the objective lens 14 of the pickup 7 is moved up and down to adjust focusing, and the objective lens 14 is moved right and left to irradiate a beam spot on an arbitrary track, so-called tracking. By performing the control, the data recorded on the optical disc 1 is reproduced.

On the disk of the optical disk 1, for example, a subcode area and a data area are provided for each frame, and a synchronization signal, position information, time information, and the like are written in the subcode area. Data is written in the data area. The data signal read from such an optical disc 1 is supplied to an error detection and data detection circuit 8, whereby, for example, a so-called sum or difference is obtained, and a laser output error, a focus error, and a tracking error are detected. The laser output error is supplied to a laser light source driving circuit 10, and the focus error and tracking error are supplied to a two-axis actuator driving circuit 12. The laser light source driving circuit 10 controls the laser power to be irradiated based on the supplied error signal so that the power of the irradiated laser is constant, and the two-axis actuator driving circuit 12 controls the objective lens 14 according to the focus error signal and the tracking error signal. It is controlled so that it drives, keeps focusing and tracking normal, and reads data accurately.

On the other hand, a reproduction signal including a synchronization signal and time information reproduced from the optical disk 1 is supplied to a CD signal processing circuit 15 of the signal processing system 3 via an error detection and data detection circuit 8. In the CD signal processing circuit 15, the mounted optical disk is a music CD in which audio data is recorded, or character data in which character information is recorded as character information such as a dictionary or an encyclopedia, for example. The CPU 5 supplies a detection signal for detecting whether the data is a so-called CD-ROM. The CD signal processing circuit 5 separates the supplied reproduction signal into a sub data signal such as a synchronization signal and time information and a main data signal. When the main data signal is audio data, the audio data signal is converted to a D-signal. It is supplied to an A (digital-analog) converter 16. The audio data signal supplied to the DA (Digital-Analog) converter 16 is converted into an analog signal, supplied to an audio reproduction circuit 17, and output as an audio signal via an output terminal 18. When the data signal supplied to the CD signal processing circuit 15 is the character data signal or the like, the CD signal processing circuit 15 supplies the character data signal or the like to the CD-ROM signal processing circuit 19. CD
-The character data signal and the like supplied to the ROM signal processing circuit 19 are read out according to the signal supplied from the CPU 5 via a RAM (random access memory) 20 which is a memory for temporary storage. The data bus 21 is connected to a ROM 22 and a RAM 23 in which programs and the like are recorded. The read character data signal and the like are transmitted via the data bus 21. Then, a display image is recorded and formed in the video RAM 26 by a kanji pattern or the like read from the kanji ROM 2 according to the character data signal,
The display image in the video RAM 26 is read by the display controller 25 in response to the signal from the CPU 5 and displayed on the display unit 27 such as an LCD (liquid crystal display panel).

When an external interface is connected to the connector 28, for example, the switch 29 is turned on simultaneously with the connection, the CPU 5 is reset, and signal processing is performed by a command from the interface. The command from the interface is processed by the external interface processing circuit 30, and the processing data is transferred to the data bus 21.
Is displayed on the display unit 27 as described above.

In such a disk reproducing apparatus, since the man-machine interface for data processing and display does not require strict time processing, these are processed as a main routine, and other processing is performed in an interrupt routine, so that the entire signal is processed. All of the processing is performed by the single CPU 5, and in the software control between the host CPU and the drive CPU, the command packet ← → status code system is diverted from the bus line system. When control from the host is desired, the main routine is replaced with a halt (HALT) instruction and a bus line control routine is started.

G-2, Appearance of Disc Reproducing Apparatus FIG. 3 is a diagram showing an appearance of a disc reproducing apparatus provided with, for example, a small portable electronic dictionary function, and FIG. 3 (a) is a left side of the disc reproducing apparatus. FIG. 2B is a top view.

3 (a) and 3 (b), the disc reproducing apparatus 40 includes the reproducing system 2, the CPU 5, the signal processing system 3, the display system 4 excluding the display unit 27 as the display means, and the like. CD-ROM with data such as Kojien, encyclopedia, etc.
Are provided on the front surface, and keys such as an alphabet key 41, a cursor movement key 42, and a selection key 43 for selecting a selection item to which the cursor has been moved are provided on the front surface. It comprises a key operation section 45 provided with a chatting section 46 for holding the CD-ROM, a display section 27 as the display means, and a lid section 47. In the electronic dictionary 40, the lid 47, the display unit 27, the key operation unit 45, and the main body 44 are sequentially rotatably mounted on a support shaft 48. In use, as shown in FIG. 3 (b). The key operation unit 45, which is parallel to the table
27 and the lid 47 are activated, and the display screen can be adjusted to an arbitrary angle so that it is easy to see and operate. Conversely, when not in use, the display unit 27 and the cover 47
Can be folded so as to be parallel, and the disc reproducing apparatus 40 in the folded state has a substantially square shape so that it can be easily carried.

G-3. Description of Operation for Reducing Power Consumption As such a disk reproducing apparatus is small and portable as described above, a battery or the like is often used as a power source, for example. That is, it is desirable to avoid supplying unnecessary power in order to keep this limited power supply as long as possible. The operation for reducing the power consumption of the disk reproducing apparatus according to the present invention will be described below with reference to the flowchart of FIG.

First, in step 51, the power of the microcomputer system such as the CPU 5 is turned on, and the process proceeds to step 52.

In step 52, it is determined whether or not there is an access request to the optical disk 1. If No, the above operation is repeated. If Yes, the process proceeds to step 53.

In step 53, the power supplies of the servo systems such as the laser light source drive circuit 10, thread feed motor 11, two-axis actuator drive circuit 12, and motor drive circuit 13 are turned on, and the process proceeds to step 54.

In step 54, the optical disk 1 is irradiated with a laser beam, and the flow advances to step 55.

In step 55, the so-called access process is performed by moving the pickup 7 by a thread feed motor in order to reproduce the designated portion, data is displayed on the display unit 27, and the process proceeds to step 56.

In step 56, it is determined whether or not an access request has been made again at this time. If Yes, the process returns to step 55 to perform the above access processing. If No, the process proceeds to step 57.

In step 57, it is determined whether or not the access processing has been performed for, for example, 5 seconds. If No, the process proceeds to step 58, and if Yes, the process proceeds to step 60. The above-mentioned five seconds is a so-called sleep time, and the processing of steps 58 and 59 is performed until five seconds elapse after the access operation is started, and the processing of steps 60 to 64 is performed after the elapse of five seconds.

In other words, the tracking servo operation is continued in step 58 until 5 seconds elapse from the start of the access operation, thereby tracing the current track traced portion and proceeding to step 59. In other words, instead of repeating the track jump to reproduce the same data and displaying the same data, the same data is displayed by controlling the reading from the video RAM 26, and during that time, the pickup 7
By continuing the track race, the power consumed by repeating the track jump and performing the reproduction, for example, 400 to 600 mA, can be reduced to about 20 mA.

In step 59, it is determined whether or not the next access request has been made. If No, the process returns to step 57 to determine whether or not the above 5 seconds have elapsed. If Yes, the process returns to step 55 to perform the above access processing.

On the other hand, when it is determined in step 57 that the sleep time of 5 seconds has elapsed, in step 60, the power of the laser beam is turned off, and the process proceeds to step 61.

In step 61, at least the servo power supply of the two-axis actuator drive circuit 12 is turned off, and the routine proceeds to step 62.

In step 62, it is determined whether or not a so-called auto-off time (for example, 20 minutes) described below has elapsed. If No, the process proceeds to step 63, and if Yes, the process proceeds to step 64.

In step 63, it is determined whether or not there is an access request within the above 20 minutes, and if No, the process returns to step 62,
If yes, the process returns to step 53 to turn on the servo power supply, turn on the laser beam in step 54, and execute the routine in step 55.

If 20 minutes have elapsed in step 62 and it is determined to be Yes, in step 64, all the power supplies including the power supply of the microcomputer system such as the CPU 5 are turned off, and the processing ends.

As is clear from the above description, in the disc reproducing apparatus of the present embodiment, the displayed data is the sleep time.
Until the second elapses, the tracking servo operation is continued instead of the track jump, and the track trace is performed.After the sleep time elapses, the laser power supply and the servo power supply are turned off. Turning off the power supply of the microcomputer system can also reduce power consumption. According to the applicant's experiment, this is the same as the conventional 1.
It was confirmed to last about 5 times.

Also, by performing the above-described track tracing, when the next access request is for a nearby track due to waiting for processing when the thread is stopped, the access time can be reduced.

Although the sleep time is set to 5 seconds and the auto-off time is set to 20 minutes, it goes without saying that this may be any time.

〔The invention's effect〕

In the disk reproducing apparatus according to the present invention, when the operation of reading data from the optical disk on which the spiral track is formed is set to the standby state, the tracking is continued as it is to set the track trace state, and the standby state may be set. The power consumption can be reduced by turning off the power of the two-axis actuator after a lapse of a predetermined time, and by continuing the tracking as it is, by waiting for the processing when the thread is stopped, the next access request can be performed in the vicinity. In the case of a truck, the access time can be reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining an operation for reducing the power consumption of the disk reproducing apparatus according to the present invention. FIG. 2 is a block diagram of the disk reproducing apparatus according to the present invention.
FIG. 1 is a diagram illustrating an appearance of a disk reproducing apparatus according to an embodiment. 2 Reproduction system 3 Audio point processing system 4 Data processing system 5 CPU 7 Pickup 8 Error detection and data detection circuit 10 Laser light source drive circuit 11 Thread feed motor 12 … Two-axis actuator drive circuit 13… Motor drive circuit 14… Objective lens 15… CD signal processing circuit 16… DA changer 17… Audio playback circuit 19… CD-ROM signal processing circuit 21… Data bus 22 ROM 23 RAM 24 Kanji ROM 25 Display controller 26 Video RAM 27 Display 28 Connector 30 External interface processing circuit 31 Keyboard

Claims (1)

(57) [Claims] 1. A disk reproducing apparatus for making an access request for data recorded along a spiral track of a disk, wherein a tracking servo operation is continued in a standby state in which no access request to the disk is issued. A track trace state, and turning off a servo power supply of at least the two-axis actuator when the standby state duration time reaches a predetermined time.