JP3159166B2 - Disc playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus, and more particularly to a disk reproducing apparatus capable of reproducing a CD-I disk storing image information in addition to audio information.

[0002]

2. Description of the Related Art CD-I (Compact Disk-Interactive)
Focuses on characteristics such as compactness of CD, large storage capacity, easy random access, and mass productivity.
Related data such as audio data, image data, and computer programs are stored on a single CD and played on a standard player, and the user can easily access the information recorded on the CD using a pointing device. It has been done.

Such a standard player for CD-I is configured as shown in FIGS. FIG. 3 shows a state where the player is closed, and FIG. 4 shows a state where the lid is opened. The overall size of this player is, for example, a width of 14
It is 0 mm, 170 mm long, and 60 mm high, and is compactly packed to be portable.

A player 1 has a substantially rectangular box-shaped housing body 2 made of a synthetic resin or the like, and a disk for driving a CD-I medium (hereinafter referred to as CDM) in the housing body 2. A drive unit or a head drive unit that moves the optical head in the radiation direction of the CDM, processes a reproduction signal from the optical head,
It includes a circuit that outputs the processed signal, a computer that controls these circuits, and the like.

[0005] A headphone jack 3, a volume control dial 4, and a power on / off switch 5 are provided on a front side surface 2a of the housing body 2. Also, the front side surface 2a of the housing body 2
An open button 6 is provided on the upper edge of the front side. CD
-On the housing body 2 of the I player 1, the inner lid 7 is rotatably arranged, and when the open button 6 is pressed, the inner lid 7 is opened. When the inner lid 7 is opened, the CDM can be removed from the housing body 2 or mounted. The inner lid 7 is provided with a window 8. The window 8 is provided with a transparent member. Through this window 8, the rotation state of the mounted CDM can be checked.

A trigger key 10a and a trigger key 10b, and an XY device 1
1 is provided. When the XY device 11 presses arrow parts arranged up, down, left, and right from the center, the X direction and the Y direction are changed.
The user can specify a screen position of the LCD 13 described later in the direction. In addition, as such an XY device 11, a pointing device such as a trackball, a mouse, and a joystick can be used. The trigger keys 10a and 10b are operated together with the XY device according to the instructions displayed on the LCD screen, so that the
Reproduction of DM can be performed.

On the inner lid 7, a lid 12 is rotatably arranged. The lid 12 can be manually opened to an opening angle of 90 degrees or more, and can be fixed at a predetermined opening angle θ. On the inner surface 12a of the lid 12, an LCD 13 having a size of, for example, 4 inches is provided. Lid 12
Is opened, as shown in FIG. 4, the screen of the LCD 13 can be viewed.

On the inner surface 12a of the lid 12, an LCD
A drive switch 14 is provided. By operating the LCD drive switch 14, ON / OFF of the LCD 13 can be controlled. Then, as shown in FIG. 3, the cover 12 can be used in the same sense as a portable compact disc player which is widely used in general, as shown in FIG. In this case, when the lid 12 is closed, the LCD 13 is automatically turned off by the operation of the LCD drive switch 14, but when only music is to be listened, the trigger key 10a and the trigger key 10b, the XY device 1
1 functions as a dedicated key for audio reproduction. For example, the trigger key 10a functions as a play / pause key, and the trigger key 10b functions as a stop key. Thus, various audio reproduction operations can be freely performed even when the driving of the LCD 13 is stopped.

As described above, the CD in which the entire system is miniaturized
A battery, a dry battery, or the like is used as a drive power supply for driving the entire -I standard player 1. In particular, various efforts have been made to meet demands for miniaturization of the system and power saving as outdoor door use.

That is, various servo circuits such as an RF circuit and a focus tracking circuit are formed into ICs by bipolar technology.
The digital signal processing section is from NMOS-LSI to CMOS
Power saving is being promoted.

[0011]

According to the CD-I standard player described in the above-mentioned conventional configuration, various circuits are integrated into LSIs to save power. However, a disk drive unit or a head drive unit for driving a CDM is used. Uses drive motors, the consumption of the drive batteries consumed by these drive motors is large.

Particularly, a conventional CD-I for outdoor use.
In the standard player, when the power supply is turned on, for example, when the play state is established, the drive motor is kept rotating, so that there is a problem that the power consumed by the drive circuit for driving the spindle drive motor increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to use a battery for a long time as much as possible, to reduce battery consumption, and to be able to use the battery for a long time. Thus, a simple disk reproducing device is obtained.

[0014]

As shown in FIG. 1, an optical head 23 for reading out index information and data from a disk 15 on which index information and data are recorded as shown in FIG. A rotation drive unit 21 for rotating the disk 15, and a servo unit 25 for performing focus servo and tracking servo of the optical head 23.
And a control unit 20 for stopping the operation of the rotary drive unit 21 and the servo unit 25 after reading the table of contents information from the disk 15 by the optical head 23. Another disc reproducing apparatus according to the present invention includes a reproducing unit 21 to 28 including an optical head 23 for reading data recorded on the disk 15 and a rotation driving unit 21 for driving the disk 15 to rotate. Control means 2 for stopping the operation of the reproducing means 21 to 28 after reading the table of contents information from
0).

The disk reproducing apparatus of the present invention stops the drive circuit of the spindle motor when the main program has been loaded, and thereafter drives the spindle motor drive circuit only when loading from the disk is necessary in accordance with the contents of the application program. In the execution of other programs, the spindle motor drive circuit is in a stopped state, so that the battery consumption can be suppressed and a disk image operation time can be extended.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment in which a disc reproducing apparatus according to the present invention is applied to a CD-I standard player.

The disc reproducing apparatus of this embodiment is a CDM to which the present invention is applied, a disc in which the CDM and the audio disc are mixed, and a normal audio disc, that is, a CD.
In this example, a CD-I standard player capable of reproducing CDM is described. FIG. 1 shows a system diagram in the case where the disc reproducing apparatus of the present invention is applied to a CD-I standard player. In general, CD-I includes audio data and requires high-speed processing in real time. Therefore, processing in a machine language is performed. Therefore, as a CPU, a 68000 system which is a 16-bit CPU is designated. Also,
A CD-RTOS (real-time operating system) that handles various files is based on the OS 9, and its program is incorporated in the system by a ROM. As an input device, at least two trigger keys and an XY device are prepared. As the output, two systems of audio and video are prepared. And CD-
The I standard player is designed to be able to reproduce a normal music CD as well.

In FIG. 1, the CDM 15 is rotated at a constant linear velocity (CLV) by a spindle motor 21.
The rotation of the spindle motor 21 is controlled by a spindle servo circuit 22 based on a clock reproduced by a CD reproduction circuit 28. Also, the spindle servo circuit 22
Is supplied with an output from the system controller 20.

The recording signal of the CDM 15 is reproduced by an optical head 23 supported by a biaxial device. The output of the focus / tracking servo circuit 25 to which the output of the system controller 20 is supplied is supplied to the biaxial device including the optical head 23. This focus
In the tracking servo circuit 25, servo is applied to the optical head 23 in two axes of a focus direction and a tracking direction based on the output of the photodetector.

The optical head 23 is driven by a slide feed mechanism 24 using, for example, a linear motor.
5 can be moved in the radiation direction. The slide feed mechanism 24 is controlled by a feed servo circuit 26. The output of the system controller 20 is supplied to the feed servo circuit 26. The slide feed mechanism 24 allows the optical head 23 to access a desired track position.

The output of the optical head 23 is supplied to a CD reproducing circuit 28 via an RF amplifier 27. The CD reproduction circuit 28 includes a bit clock reproduction circuit, an EFM demodulation circuit,
It comprises a CIRC error correction circuit and the like. In the CD reproducing circuit 28, the output of the optical head 23 is EFM-demodulated and subjected to error correction processing. The CD reproduction circuit 28 is controlled by the system controller 20.

The output of the CD reproducing circuit 28 is the signal processing circuit 2
9. The signal processing circuit 29 includes a sync detection circuit, a descrambling circuit, an error correction circuit, and the like. The sync is detected by the CD reproducing circuit 28, and the scramble is released. Then, the header address is checked, and the target block is accessed. And CD
If the data recorded in M15 is, for example, Form 1 in a format that is not predetermined, an error correction process is further performed. The signal processing circuit 29 is controlled by the system controller 20.

The system controller 20 includes the input device 3
Input is provided from 0. The input device 30 has two trigger keys 10 a and 10 b and an XY device 11.

Reference numeral 31 denotes a CPU for controlling the CD-I system. As the CPU 31, a 68000 type CPU is used. The master controller 32 is connected to the CPU 31. The CPU 31 and the system controller 20 are bidirectionally connected. CPU31
Derives a bus 33.

The data reproduced by the signal processing circuit 29 is
It is sent to the bus 33. RAMs 35A and 35A are connected to the bus 33 via video controllers 34A and 34B, respectively.
B is connected. The bus 33 has a system ROM
36, a backup non-volatile RAM 37 is bidirectionally connected. An audio decoder 38 is connected to the bus 33.

Image data of the data reproduced by the signal processing circuit 29 is supplied to video controllers 34A and 34B under the control of the CPU 31. The video controllers 34A and 34B form video signals based on the image data.

This video signal is transmitted to the video synthesizer 3
9. The video signal from the video controller 34A and the video signal from the video controller 34B are synthesized by the video synthesizer 39. The output of the video synthesizer 39 is supplied to the above-described LCD 13 via the LCD drive circuit 40. The drive of the LCD 13 can be turned on / off by an LCD drive switch 14.

Audio data among the data reproduced by the signal processing circuit 29 is supplied to an audio decoder 38 under the control of the CPU 31. For example, in the case of ADPCM among the four modes of audio data,
ADPCM is decoded by the audio decoder 38. The decoded audio data is supplied to the D / A converter 41 and is converted into an analog signal. The signal is output from the headphone output terminal 3 via the low-pass filter 42 and the amplifier 43. The audio signal level output from the headphone output terminal 3 can be set by a volume adjustment dial 4.

Each of the circuits described above is driven by a secondary battery 17 such as a battery. One end of the secondary battery 17 is grounded, and the other end is supplied to DC / DC converters 18 and 19 via the power on / off switch 5. These DC / DC converters 18 and 19 constitute a regulator circuit, and supply a stabilized voltage of, for example, 5 V to the CPU 3.
1, system controller 20, video controller 3
4A, 34B and various circuits such as the audio decoder 38. That is, the DC / DC converter 18 is supplied as a power supply voltage of various drive circuits of the drive circuit system of the CDM 15 including the system controller 20, and the DC / DC converter 19 is supplied to the video controller system and the audio decoder system drive circuit including the CPU 31. Supplied as

Of course, a power supply voltage of 5 V is also supplied to the spindle servo circuit 22. The spindle servo circuit 22 includes a drive circuit such as a drive amplifier for driving the spindle motor 21, and the system controller 20 controls the power switch 5
Of the spindle servo circuit 2
2 is controlled based on a control signal of the system controller 20.

The operation of this embodiment in the above configuration will be described with reference to FIG. FIG. 2 shows a flowchart in a case where the power is turned on and a predetermined program is executed, for example.

When the CDM 15 is mounted on the CD-I standard player 1 shown in FIG. 3 and the power on / off switch 5 is pressed (first step ST ₁ ), the system controller 20 and the CPU 31 initialize (see FIG. 3). 2 steps ST ₂ ).

Next, a control signal for driving the feed servo circuit 26 is supplied from the system controller 20, the optical head 23 is brought to the lead-in position of the CDM 15, and a focus tracking servo circuit for reading TOC (table of contents information). The spindle servo circuit 22 is also driven, and the spindle motor 21 is rotated to start the CDM 15 (third step ST ₃ ).

In the next fourth step ST ₄ , application software and the like are read by the TOC of the CDM 15 and the system controller 20. This fourth step S
When the reading of the data or program termination T _4, the system controller 20 and the fourth step ST ₄ to be completed is determined whether reading of the program has been completed
To maintain, but the sixth step ST ₆ spindle willing without voltage supply to the drive circuits described above to the servo circuit 22, focus tracking servo circuit 25 to stop the feed servo circuit 26, etc. If it has been completed .

The execution of the next program in the seventh step ST ₇ is carried out, for example, trigger key 10a, 10b
The program is executed by exchanging data with the relevant data of the computer program displayed on the screen of the LCD 13 by the XY device 11 or the like as a pointing device.

Next, the power switch is turned off (eighth step S
T ₈ ) It is the end.

In the above-described configuration, an example has been described in which control is performed to cut off a drive circuit system such as the CDM 15 during execution of a computer program. However, during the period in which the CDM drive is stopped, program load and application data load are performed. Otherwise, the read data is temporarily stored in the RAMs 35A and 35B. Therefore, the drive circuit of the CDM 15 should be stopped while writing data to these storage means or reading data from the storage means. Thus, battery consumption can be prevented.

[0038]

According to the disk reproducing apparatus of the present invention, the CDM drive circuit is not continuously rotated during use of the reproducing apparatus, and the CDM 15 is intermittently switched according to the application software to be used. The drive circuit to be driven is disconnected, and when the drive of the CD drive circuit is unnecessary, the CDM drive circuit that consumes a large amount of power is stopped, so that the battery consumption can be reduced and the use time of the disk reproducing device can be extended. Is obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a disk reproducing apparatus according to the present invention.

FIG. 2 is a flowchart showing one embodiment of the disk reproducing apparatus of the present invention.

FIG. 3 is a perspective view of a conventional disc reproducing apparatus in a closed state.

FIG. 4 is a perspective view of a conventional disk reproducing apparatus in an open state.

[Explanation of symbols]

1 CD-I player, 2 housing body, 5 power on / off switch, 13 LCD, 15 CD
M, 17 ‥‥ battery, 18 ‥‥ DC-DC converter

Claims (7)

(57) [Claims] 1. An optical head for reading out table of contents information and data from a disk on which the table of contents information and data are recorded, a rotation driving unit for rotating the disk, and a servo unit for performing focus servo and tracking servo of the optical head. And a control unit for stopping the operation of the rotation drive unit and the servo unit after reading the table of contents information from the disk by the optical head. 2. The disk reproducing apparatus according to claim 1, wherein said disk reproducing apparatus further includes a power supply circuit for supplying a power supply voltage to at least said servo means and said control means based on a voltage from a battery. 3. The disc reproducing apparatus further comprises: signal processing means for performing signal processing on a signal output from the optical head; and storage means for temporarily storing data from the signal processing means. 2. The disk reproducing apparatus according to claim 1, wherein the operation of the servo unit is stopped while the data stored in the storage unit is being read. 4. The disc reproducing apparatus further comprises: signal processing means for performing signal processing on a signal output from the optical head; and storage means for temporarily storing data from the signal processing means. 2. The disk reproducing apparatus according to claim 1, wherein the operation of the servo unit is stopped except when writing data from the signal processing unit to the storage unit. 5. A reproducing means including an optical head for reading data recorded on a disk and a rotation driving means for rotating the disk, and an operation of the reproducing means after reading the table of contents information from the disk by the optical head. Disc playback device comprising: control means for stopping the operation. 6. The reproducing means includes servo means for performing focus servo and tracking servo of the optical head, and the control means stops the operation of the servo means after reading the table of contents information from the disk by the optical head. The disk reproducing apparatus according to claim 5, which causes the reproduction. 7. The disk reproducing apparatus further comprises: a power supply voltage based on at least a voltage from a battery;
6. The disc reproducing apparatus according to claim 5, further comprising a power supply circuit for supplying the control means.