JP3347910B2 - Disk drive 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 drive device such as a CD-ROM, and more particularly, to the storage of a random access memory (RAM) even when a disk is ejected (ejected) unless erase command data is supplied. The present invention relates to a disk drive device that does not erase data.

[0002]

2. Description of the Related Art Known CD-ROM drive devices include at least one or more CDs (compact discs, hereinafter referred to as "CDs").
A CD changer on which a disc is mounted, a data reading unit for reading recording data of one disc selected by the CD changer, and a large-scale error correction unit for correcting errors in the recording data read by the data reading unit. An integrated circuit (LSI) and a random access memory (R) for storing recording data processed by the error correction LSI
AM) and an input / output unit for transmitting and receiving data between an externally connected device, for example, a navigation system, and a CD-ROM.
And a control unit for controlling the entire operation of the ROM drive device.

When this CD-ROM drive device is connected to an in-vehicle navigation system which is an externally connected device, command data supplied from a control unit on the navigation system side (hereinafter, referred to as a navigation side control unit) is transmitted. When supplied to a control unit on the CD-ROM drive device side (hereinafter referred to as a device-side control unit), the device-side control unit accesses a predetermined location on a predetermined disk in accordance with the supplied command data, and The recording data, for example, map data, is read by a data reading unit, and the read recording data is subjected to error correction processing by an error correction LSI, and then the RAM of the CD-ROM drive (hereinafter referred to as the device RAM). To memorize. Thereafter, when the next command data is supplied from the navigation-side control unit to the device-side control unit, the device-side control unit accesses a predetermined location of a predetermined disc in accordance with the supplied command data, and records data of the predetermined location. For example, another map data or the like is read by a data reading unit, the read recording data is subjected to an error correction process by an error correction LSI, and then stored in a device-side RAM. Each time new command data is supplied to the unit, the above-described operation is repeatedly performed in the CD-ROM drive device.

When read command data is supplied from the navigation-side control unit to the device-side control unit, the data stored in the device-side RAM is read out by the device-side control unit, and the read data is used for navigation. The data is transferred to a RAM on the system side (hereinafter, referred to as a navigation RAM) and stored in the navigation RAM, and the navigation system uses data stored in the navigation RAM as needed.

[0005]

SUMMARY OF THE INVENTION In a vehicle navigation system to which a CD-ROM drive is connected,
When driving a car, a user such as a car driver
It often happens that a music audio disc stored in a CD changer of a ROM drive device is selected and the music audio disc is desired to be reproduced.
When such a situation occurs, a user such as a car driver ejects the CD changer in the CD-ROM drive device, and selects a music audio disc instead of the map disc that has been selected up to then. Do.

In a known CD-ROM drive, when a CD changer ejects a disc, data (map data) stored in the apparatus RAM up to that point is erased, and audio data is newly stored in the apparatus. It is stored in the side RAM. At this time, if the read command data is supplied from the navigation-side control unit to the device-side control unit, the map data is not stored in the device-side RAM (only the audio data is stored). The required map data cannot be transferred from the device-side RAM to the navigation-side RAM, and unless the map disk is immediately selected again in the CD changer, it is impossible to accurately guide the traveling of the vehicle by the on-vehicle navigation system. There's a problem.

In order to avoid such a situation, the device side R
Each time map data is stored in the AM, a means for sequentially transferring the map data to the navigation RAM may be considered. However, such a means increases the storage capacity of the navigation RAM when executed. Therefore, there is a problem that it is not a very practical means.

An object of the present invention is to solve these problems, and an object of the present invention is to provide a disk drive capable of operating an external connection device normally even if a disk is replaced. .

[0009]

In order to achieve the above object, the present invention provides a disk mounting portion on which at least one or more disks can be mounted, and a method for recording one disk mounted on the disk mounting portion. A data reading section for selectively reading data, and a large-scale error correction large-scale integrated circuit (LS) for correcting an error of the recording data read by the data reading section.
I), a random access memory (RAM) for storing processing data of the error correction LSI, an input / output unit for transmitting / receiving data to / from an externally connected device, and a control unit for controlling the entire operation; In the disk drive device provided with, when the disk is ejected for disk replacement in the disk mounting unit, the stored data of the RAM read from the disk immediately before disk replacement is not erased. The stored data read from the disk immediately after the disk replacement is stored in the RAM, and after the disk replacement, a command for reading the stored data of the immediately preceding disk from the externally connected device side to the disk drive device side. Is supplied, the stored data is read from the RAM in response to the read command. When the stored data is supplied to the RAM of the externally connected device and the stored data is supplied to the RAM of the externally connected device, when an erasure command is supplied from the externally connected device to the disk drive device, Only means for erasing the stored data in the RAM of the disk drive device is provided.

[0010]

According to the above means, the disk drive device comprises:
In order to exchange the selected disk in the disk mounting unit (disk changer), even if the disk is ejected, the stored data in the RAM read from the selected disk immediately before the disk exchange is left without being erased. , And the recording data read from the new selected disk is stored in the RAM together with the stored data. Then, after replacement of the selected disk, an externally connected device to which the disk drive device is connected, for example,
When the read command data of the RAM is supplied from the in-vehicle navigation system to the disk drive, the stored data is read from the RAM in response to the read command data, and the read stored data is stored in the external device. For example, it is supplied to the RAM of the in-vehicle navigation system. In this case, the stored data in the RAM of the disk drive is erased when erase command data is supplied from the externally connected device, for example, the in-vehicle navigation system to the disk drive.

As described above, according to the above-mentioned means, even if the disk is exchanged in the disk drive, the stored data in the disk drive RAM is not erased, and the stored data is not externally connected. Since the erasure is performed only when the erasure command data is supplied from the device, for example, the in-vehicle navigation system, the operation of the externally connected device, for example, the in-vehicle navigation system is not hindered by the disk replacement. For example, there is no need to provide a large-capacity RAM in an in-vehicle navigation system.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a disk drive device according to the present invention.
This shows an example in which the disk drive device is a CD-ROM drive device and the external connection device is an in-vehicle navigation system.

In FIG. 1, 1 is a CD-ROM drive device, 2 is an on-vehicle navigation system (only a main part configuration), 3 is a CD changer, 4 is a data reading unit, 5 is an error correction large-scale integrated circuit (LSI), 6 is a random access memory (RAM), 7 is an input / output unit, 8 is a control unit,
Reference numeral 9 denotes an input / output unit, 10 denotes a RAM, and 11 denotes a control unit.

The CD-ROM drive device 1
A CD changer 3 on which at least one or more CD-ROMs (not shown) can be mounted, a data reading unit 4 for reading recording data of one CD-ROM selected by the CD changer 3, and a data reading unit 4 Error correcting LSI 5 for correcting the error of the recording data, and a RAM for storing the recording data processed by the error correcting LSI 5
6, an input / output unit 7 for transmitting and receiving data to and from the on-vehicle navigation system 2, and a control unit 8 for overall controlling the operation of the CD-ROM drive 1.
The main components of the in-vehicle navigation system 2 include, at least, an input / output unit 9 for transmitting and receiving data to and from the CD-ROM drive device 1 and transfer and storage of data stored in the RAM 6 of the CD-ROM drive device 1. And a control unit 11 that controls the operation of the on-vehicle navigation system 2 as a whole.

The CD-ROM drive 1 having the above configuration operates as follows.

First, a CD-ROM drive 1 is connected to an in-vehicle navigation system 2, and a CD-ROM drive 1 is connected.
On the side of the ROM drive device 1, one CD-ROM storing map data of a predetermined area necessary for guiding the traveling of the car is selected in the CD changer 3,
The data reading section 4 reads recording data from a predetermined portion of a selected CD-ROM (hereinafter, referred to as a selected CD-ROM) and supplies it to an error correction LSI 5, which processes the supplied data. Supplied to the RAM 6, and data is already stored in the RAM 6.

At this time, the current position of the running car is updated, and the control unit 11 of the on-vehicle navigation system (also referred to here as the navigation-side control unit 11) receives the information via both input / output units 9 and 7. When the command data is supplied to the control unit 8 of the CD-ROM drive device 1 (this is also referred to as the device-side control unit 8), the data reading unit 4 is controlled by the device-side control unit 8, Access a predetermined location of the selected CD-ROM according to the supplied command data,
The recording data at a predetermined location is read, and the read recording data is supplied to the error correction LSI 5. L for error correction
The SI 5 performs an error correction process on the supplied recording data, and stores the processed recording data in the RAM 6 of the CD-ROM drive device (this is also referred to as the device RAM 6 here).
To supply. The device RAM 6 rewrites the stored data using the supplied recording data.

Thereafter, when the current position of the car is updated again and the next command data is supplied from the navigation-side control unit 11 to the device-side control unit 8, as in the previous case, the device-side control unit 8 is updated. The data reading unit 4 accesses a predetermined location of the selected CD-ROM according to the supplied command data, reads the recording data at the predetermined location, and corrects the read recording data by the error correction LSI 5 under the control of After processing, the data is supplied to the device-side RAM 6 and
The new stored data is rewritten in the CD-ROM drive device 1 every time new command data is supplied from the navigation control unit 11 to the device control unit 8.
Then, the above-described rewriting operation for the data already stored in the device-side RAM 6 is repeatedly executed.

When a new map image needs to be displayed on the display unit of the display device (not shown) on the in-vehicle navigation system 2 side, a read command is sent from the navigation side control unit 11 to the device side control unit 8. When the data is supplied, the device-side control unit 8 reads the stored data of the device-side RAM 6, and the read stored data is transmitted from the device-side control unit 8 via the input / output units 7 and 9. Is transferred to the navigation-side control unit 11,
1 to the navigation system 2 side RAM 10 (also referred to as the navigation side RAM 10 here). The data stored in the navigation RAM 10 is
Under the control of the navigation control unit 11, the information is read out at any time and used for displaying a map or the like.

In this state, a user such as a car driver wants to listen to music, ejects the CD changer 3 of the CD-ROM drive 1, and selects a disc. -RO
One music CD-ROM is selected instead of M. At this time, the device-side RAM 6 stores a known CD-ROM.
Unlike the ROM drive device, the device is controlled by the device-side control unit 8 so that stored data is not erased when the CD changer 3 is ejected. And
When the music CD-ROM is selected, under the control of the device-side control unit 8, the data reading unit 4 reads the recording data at a predetermined location of the music CD-ROM, and uses the read recording data for error correction. After performing error correction processing in LSI5,
It is supplied to the device side RAM 6. The device-side RAM 6 stores the supplied CD-ROM for the map selected previously.
Of the newly selected music CD-
Since the data is stored in the ROM, new data is stored together with the stored data without rewriting the stored data.

At this time, if it becomes necessary for the in-vehicle navigation system 2 to display a new map image on the display unit of the display device, the navigation-side control unit 1
The read command data is supplied from 1 to the device-side control unit 8. In response to the read command data, the device-side control unit 8 reads the stored data of the device-side RAM 6 as described above, and the read stored data is transmitted from the device-side control unit 8 to both input / output units. The data is transferred to the navigation-side control unit 11 via 7 and 9, and then transferred from the navigation-side control unit 11 to the navigation-side RAM 10 and stored. And the navigation side R
As described above, the data stored in the AM 10 is read out at any time under the control of the navigation-side control unit 11 and used for displaying a map or the like.

On the other hand, a map CD-RO used by a car
When the vehicle goes out of the area covered by M or when a user such as a car driver cancels the traveling guidance by the in-vehicle navigation system, the navigation-side control unit 11 generates erase command data. At this time, the erasure command data is transmitted and transferred from the navigation-side control unit 11 to the device-side control unit 8 via the input / output units 9 and 7, and then transferred and supplied from the device-side control unit 8 to the device-side RAM 6. Is done. Device side RA
When the erase command data is supplied, M6 erases the stored data and waits for the supply of new data.

As described above, according to this embodiment, the CD-R
Even if the disc is ejected by the CD changer 3 of the OM drive device 1 and the CD-ROM is exchanged,
CD-ROM before replacement stored in the device side RAM 6
Is not erased, and the stored data is erased only by the erase command data supplied from the in-vehicle navigation system 2, so that the predetermined operation of the in-vehicle navigation system 2 is immediately interrupted after the replacement of the CD-ROM. Not be done.

Further, according to the present embodiment, the on-vehicle navigation system 2 only needs to receive data from the CD-ROM drive device 1 each time it is used, and a large amount of data is stored in the navigation RAM 10 in advance. Therefore, there is no need to prepare a large-capacity navigation RAM 10.

In the above-described embodiment, an example in which the disk drive is the CD-ROM drive 1 has been described.
Not limited to the D-ROM drive 1,
-It may be applied to another device similar to the ROM drive device 1.

Further, in the above-described embodiment, an example is described in which the external connection device connected to the disk drive device is the in-vehicle navigation system 2, but the external connection device connected to the disk drive device of the present invention is However, the present invention is not limited to the in-vehicle navigation system 2, and other devices may be connected.

[0028]

As described above in detail, according to the present invention, even if the disk is exchanged in the disk drive, the RAM 6 in the disk drive can be used.
Is not erased, and the stored data is erased only when erase command data is supplied from an externally connected device, for example, the in-vehicle navigation system 2. Therefore, there is an effect that the operation of the externally connected device, for example, the in-vehicle navigation system 2 is not hindered after the replacement of the disk.

Further, according to the present invention, the externally connected device, for example, the in-vehicle navigation system 2 only has to receive data from the disk drive device each time it is used. There is no need to store it in the RAM 10 on the navigation system 2 side, so that there is no need to use a large-capacity RAM 10 on the navigation system 2 side.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a disk drive device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CD-ROM drive device (disk drive device) 2 In-vehicle navigation system (only the main part structure) 3 CD changer (disk mounting part) 4 Data reading part 5 Error correction large-scale integrated circuit (LSI) 6 Random access memory (RAM, 7 Device input / output unit (device side) 8 Control unit (device side control unit) 9 Input / output unit (navi side) 10 RAM (navi side RAM) 11 Control unit (navi side control unit)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G11B 20/10 G01C 21/00 G08G 1/0969

Claims (3)

(57) [Claims] 1. A disk loading section on which at least one or more disks can be loaded, a data reading section for selectively reading recording data of one disk loaded on the disk loading section, and a data reading section. An error correction large-scale integrated circuit (LS) that corrects errors in the read recording data.
I), a random access memory (RAM) for storing processing data of the error correction LSI, an input / output unit for transmitting / receiving data to / from an externally connected device, and a control unit for controlling the entire operation ; Disk drive device with
There, the disk for disk replacement in the disk mounting portion
When the disk is ejected, the disk
The stored data of the RAM read from the memory is erased.
The disk is saved without being replaced, and the disk
Data read from the disk is stored in the RAM, and after the disk replacement , the data is read from the externally connected device side.
On the disk drive unit side, the stored data of the
When a data read command is supplied,
The stored data is read from the RAM in response to a command.
The data is read and supplied to the RAM of the externally connected device, and the stored data is supplied to the RAM of the externally connected device.
The disk drive from the external device.
Only when an erase command is supplied to the live device
The stored data in the RAM on the disk drive device side
A disk drive device wherein data is erased . 2. The disk drive device according to claim 1, wherein the disk drive device is a CD-ROM drive device, the disk is a CD-ROM, and the disk mounting section is a CD changer. 3. The disk drive device according to claim 1, wherein the externally connected device is an in-vehicle navigation system, and the input / output unit is connected to a control unit and a built-in RAM of the in-vehicle navigation system, respectively.