JPH08287599A - Disk drive device - Google Patents

Abstract

PURPOSE: To enable normal operations even when a disk is exchanged, by not erasing but remaining the recorded data of a RAM read from a selected disk just before the disk exchange even when disk ejection is performed. CONSTITUTION: When a CD-ROM for music is selected by ejecting a CD changer 3 of a CD-ROM drive device 1 while a map image is displayed on the side of an on-vehicle navigation system 2, under the control of a device side control part 8, the CD-ROM for music is read by a data reading part 4 and supplied through an LSI 5 for error error correction to a RAM 6. When the supplied data are not data for map selected before, the RAM 6 does not reload the stored data but stores those supplied data together. Thus, even when the exchange of CD-ROM is performed, the stored data in the RAM 6 are not erased unless there are erasing command data from a navigation side control part 11, and the prescribed operation of the system 2 is not interrupted.

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 a random access memory (RAM) storage even if a disk is 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 CD (compact disc, hereinafter,
This is called a disc), a CD changer, a data reading unit that reads the recorded data of one disc selected by the CD changer, and a large-scale error correction that corrects the error of the recorded data read by the data reading unit. An integrated circuit (LSI) and a random access memory (R) that stores record data processed by an error correction LSI
AM) and an externally connected device, for example, an input / output unit for transmitting and receiving data to and from a navigation system, and a CD-
The control unit controls the overall operation of the ROM drive device.

When the 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, this will be referred to as a navigation side control unit) is obtained. When it is supplied to the control unit on the side of the CD-ROM drive (hereinafter referred to as the device-side control unit), the device-side control unit accesses a predetermined position on a predetermined disk according to the supplied command data, and After the record data, for example, map data, is read by the data reading unit, the read record data is subjected to error correction processing by the error correction LSI, and then the RAM of the CD-ROM drive device side (hereinafter referred to as the device side RAM). To memorize. After that, 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 portion of a predetermined disc according to the supplied command data and records data of the predetermined portion, For example, other map data is read by the data reading unit, the read record data is subjected to error correction processing by the error correction LSI, and then stored in the device side RAM. The above-described operation is repeatedly executed in the CD-ROM drive device each time new command data is supplied to the unit.

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

[0005]

In a vehicle-mounted navigation system to which a CD-ROM drive device is connected,
While the car is running, the user such as a car driver
It often happens that a user wants to select a music audio disc stored in a CD changer of a ROM drive device and play the music audio disc.
When such a situation occurs, a user such as a car driver ejects a CD changer disc in the CD-ROM drive device and selects a music audio disc instead of the map disc that has been selected until then. To do.

By the way, in the known CD-ROM drive device, when the disc eject of the CD changer is performed, the data (map data) stored in the device side RAM until then is erased, and new audio data is recorded in the device. It will be stored in the side RAM. At this time, if read command data is supplied from the navigation-side control unit to the device-side control unit, map data is not stored in the device-side RAM (only audio data is stored). The necessary 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 becomes impossible to accurately guide the vehicle by the in-vehicle navigation system. There's a problem.

In order to avoid such a situation, the device side R
It is conceivable to transfer the map data to the RAM on the navigation side each time the map data is stored in the AM, but such a method requires a huge storage capacity of the RAM on the navigation side. However, there is a problem that it is not a very practical means.

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

[0009]

In order to achieve the above-mentioned object, the present invention provides a disc mounting portion on which at least one disc can be mounted, and recording of one disc mounted on the disc mounting part. A data reading unit that selectively reads data, an error correction LSI that performs error correction on the recording data read by the data reading unit, a RAM that stores processing data of the error correction LSI, and an external connection device It consists of an input / output unit for transmitting and receiving data between them and a control unit for controlling the overall operation, and the stored data in the RAM is erased only when erase command data is supplied through the control unit. Equipped with a means to be.

[0010]

According to the above means, the disk drive device is
In order to replace the selected disk in the disk mounting section (disk changer), even if the disk is ejected, the already stored data in the RAM read from the selected disk immediately before the disk replacement is not erased but left as it is. Then, the recording data read from the new selected disk is stored in the RAM together with the already stored data. Then, after replacement of the selected disk, an external connection device to which the disk drive device is connected, for example,
When read command data of the RAM is supplied from the in-vehicle navigation system side to the disk drive device side, the stored data is read from the RAM in response to the read command data, and the read stored data is externally connected device. , For example, is supplied to the RAM on the side of the in-vehicle navigation system. In this case, the already stored data in the RAM on the disk drive device side is erased when the erase command data is supplied from the externally connected device, for example, the in-vehicle navigation system side to the disk drive device side.

As described above, according to the above means, even if the disk is replaced in the disk drive device, the stored data in the RAM of the disk drive device is not erased, and the stored data is externally connected. Since the data is erased only when the erase command data is supplied from the device, for example, the in-vehicle navigation system side, the operation of the external connection device, for example, the in-vehicle navigation system is not hindered by the disk replacement, and the external connection device is For example, it is not necessary to provide a large-capacity RAM in the vehicle-mounted navigation system.

[0012]

Embodiments of the present invention will now be described 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.
In this example, the disk drive device is a CD-ROM drive device and the external connection device is an in-vehicle navigation system.

In FIG. 1, reference numeral 1 is a CD-ROM drive device, 2 is an in-vehicle navigation system (only the main 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 is an input / output unit, 10 is a RAM, and 11 is a control unit.

The CD-ROM drive device 1 is
A CD changer 3 that can mount at least one CD-ROM (not shown), a data reading unit 4 that reads the recorded data of one CD-ROM selected by the CD changer 3, and a data reading unit 4 Error correction LSI 5 for performing error correction on the recorded data, and RAM for storing the recorded data processed by the error correction LSI 5.
6, an input / output unit 7 that transmits and receives data to and from the vehicle-mounted navigation system 2, and a control unit 8 that totally controls the operation of the CD-ROM drive device 1.
Further, the main configuration of the vehicle-mounted navigation system 2 is at least the input / output unit 9 for transmitting / receiving data to / from the CD-ROM drive device 1 and the transfer data stored in the RAM 6 on the CD-ROM drive device 1 side. The RAM 10 and the control unit 11 that totally controls the operation of the in-vehicle navigation system 2 are provided.

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

First, the CD-ROM drive device 1 is connected to the vehicle-mounted navigation system 2, and
On the side of the ROM drive device 1, the CD changer 3 selects one CD-ROM that stores map data of a predetermined area necessary to guide the traveling of the vehicle.
The data reading unit 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 the error correction LSI 5, and the error correction LSI 5 processes the supplied data. Then, the data is supplied to the RAM 6, and the data is already stored in the RAM 6.

At this time, the current position of the running vehicle is updated, and the control unit 11 on the side of the in-vehicle navigation system (also referred to as the navigation side control unit 11) through both input / output units 9 and 7 at this time. When command data is supplied to the control unit 8 (also referred to as the device-side control unit 8) on the CD-ROM drive device 1 side, the data reading unit 4 is controlled by the data-reading unit 4 under the control of the device-side control unit 8. According to the supplied command data, access the specified location of the selected CD-ROM,
The recording data at a predetermined position is read and the read recording data is supplied to the error correction LSI 5. L for error correction
The SI 5 performs error correction processing on the supplied recording data, and the processed recording data is stored in the RAM 6 on the CD-ROM drive device side (also referred to as the device side RAM 6 here).
Supply to. The device-side RAM 6 rewrites the already stored data using the supplied recording data.

After that, when the current position of the vehicle is updated again and the next command data is supplied from the navigation-side control unit 11 to the device-side control unit 8, the device-side control unit 8 is operated as in the previous case. Under the control of, the data reading unit 4 accesses a predetermined portion of the selected CD-ROM in accordance with the supplied command data, reads the recording data at the predetermined portion, and the read recording data is error-corrected by the error correction LSI 5. After processing, it is supplied to the device side RAM 6 and the device side RAM 6
Data stored in the CD-ROM drive device 1 is rewritten every time new command data is supplied from the navigation side control unit 11 to the device side control unit 8.
Then, the rewriting operation for the already stored data in the device RAM 6 as described above is repeatedly executed.

When it is necessary to display a new map image on the display unit of the display device (not shown) on the side of the in-vehicle navigation system 2, the navigation side control unit 11 sends a read command to the device side control unit 8. When the data is supplied, the device-side control unit 8 reads out the already-stored data in the device-side RAM 6, and the read-out already-stored data is sent from the device-side control unit 8 through the input / output units 7 and 9 of both devices. It is transferred to the side control unit 11, and further, the navigation side control unit 1
1 to the navigation system 2 side RAM 10 (also referred to as the navigation side RAM 10 here). Then, the data stored in the RAM 10 on the navigation side is
Under the control of the navigation side control unit 11, it is read out at any time and used for displaying a map or the like.

In such a state, when a user such as a car driver wants to listen to music, ejects the CD changer 3 of the CD-ROM drive device 1 and selects a disk, the map CD selected until then is selected. -RO
One piece of music CD-ROM is selected instead of M. At this time, the device side RAM 6 is a known CD-
Unlike the ROM drive device, the device-side controller 8 controls the stored data so that the stored data is not erased when the CD changer 3 is ejected. And
When the music CD-ROM is selected, the data reading unit 4 reads the record data at a predetermined portion of the music CD-ROM under the control of the device-side control unit 8 and uses the read record 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 is a map CD-ROM for which the supplied data was previously selected.
Newly selected music CD-not recorded data
Since it is the data recorded in the ROM, new data is stored together with the already stored data without rewriting the already stored data.

At this time, if it is necessary to display a new map image on the display section of the display device on the side of the in-vehicle navigation system 2, the navigation side control section 1
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 already-stored data in the device-side RAM 6 as described above, and the read already-stored data is sent from the device-side control unit 8 to both input / output units. It is transferred to the navigation-side control unit 11 via 7, 9 and then transferred from the navigation-side control unit 11 to the navigation-side RAM 10 for storage. 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, the map CD-RO used by the car
When the user goes out of the area covered by M or the user such as a car driver cancels the driving guidance by the in-vehicle navigation system, the navigation side control unit 11 generates the erase command data. At this time, the erase command data is transferred and transferred from the navigation-side control unit 11 to the device-side control unit 8 via both input / output units 9 and 7, and then transferred and supplied from the device-side control unit 8 to the device-side RAM 6. To be done. Device side RA
When the erase command data is supplied, the 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 eject is performed 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 RAM 6
Data is not erased and the stored data is erased only by the erase command data supplied from the vehicle-mounted navigation system 2. Therefore, the predetermined operation of the vehicle-mounted navigation system 2 is interrupted immediately after the replacement of the CD-ROM. There is nothing to be done.

Further, according to the present embodiment, the in-vehicle navigation system 2 only needs to receive data from the CD-ROM drive device 1 side each time it is used, and stores a large amount of data in the navigation side RAM 10 in advance. Since it is not necessary to store it, it is not necessary to prepare a large-capacity RAM 10 for navigation.

In the above embodiments, the example in which the disk drive device is the CD-ROM drive device 1 has been described, but the disk drive device of the present invention is C
It is not limited to the D-ROM drive device 1, but a CD
-It may be applied to other devices similar to the ROM drive device 1.

In the above embodiment, the external connection device connected to the disk drive device has been described as an on-vehicle navigation system 2. However, the external connection device connected to the disk drive device of the present invention is The in-vehicle navigation system 2 is not limited to this, and other devices may be connected.

[0028]

As described above in detail, according to the present invention, even if the disk is replaced in the disk drive device, the RAM 6 on the disk drive device side is provided.
The already stored data (stored data) is not erased, and this stored data is erased only when the erase command data is supplied from the externally connected device, for example, the in-vehicle navigation system 2 side. Therefore, there is an effect that the operation of the externally connected device, for example, the in-vehicle navigation system 2 is not disturbed after the disc is replaced.

Further, according to the present invention, the externally connected device, for example, the vehicle-mounted navigation system 2 has only to receive data from the disk drive device side each time it is used, and a large amount of data is previously stored in the vehicle-mounted navigation system 2. Since it is not necessary to store it in the RAM 10 on the side, there is an effect that it is not necessary to use a large capacity RAM 10 on the side of the navigation system 2.

[Brief description of 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]

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

Claims (3)

[Claims] 1. A disk loading section for mounting at least one disk, a data reading section for selectively reading recorded data of one disk loaded in the disk loading section, and a data reading section. Large-scale integrated circuit for error correction (LS) that corrects the error of read recorded data
I), a random access memory (RAM) that stores the processing data of the error correction LSI, an input / output unit that transmits and receives data to and from an externally connected device, and a control unit that controls the overall operation. The disk drive device is characterized in that the stored data in the RAM is erased only when erase command data is supplied via the control unit. 2. The disk drive device is a CD-RO
2. The disc drive device according to claim 1, wherein the disc drive device is an M drive device, the disc is a CD-ROM, and the disc mounting portion is a CD changer. 3. The disk drive device according to claim 1, wherein the externally connected device is a vehicle-mounted navigation system, and the input / output unit is connected to a control unit and a built-in RAM of the vehicle-mounted navigation system, respectively. .