JPS6282560A - Disk reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a disc playback device suitable for use in a vehicle, and particularly in one in which an operation section and a disc playback mechanism section are installed separately. Relates to disks with protective measures.

[Technical Background of the Invention] As is well known, in the field of acoustic starters, information signals are converted into PCM in order to record and reproduce them with as high density and high fidelity as possible.
BACKGROUND ART Digital recording and reproducing systems that convert data into digital data using pulse code modulation technology, record it on a recording medium such as a disk or magnetic tape, and reproduce the data are now in widespread use. Among these, those using disks as recording media have a diameter of 12c+n.
Compact discs, in which a bit string corresponding to digitized data is formed on a disc and read optically, are now the mainstream.

On the other hand, the compact disc player that plays the above-mentioned compact disc uses a semiconductor laser and a photoelectric transformer.
! An optical pickup containing four elements is moved in a linear tracking manner from the inner circumference to the outer circumference of the disk, and the compact disk is moved at a constant linear velocity (
The data recorded on the compact disc is read by rotating the compact disc using the CLV method.

Recently, there has been a push to introduce the above-mentioned compact disc players into so-called car use, where they are installed in automobiles. Incidentally, a vehicle-mounted compact disc player is inevitably small and has a special shape because its installation location and space are limited.

FIG. 3 shows such a conventional vehicle-mounted compact disc player, which is assumed to have an autochanger function that can selectively play a plurality of discs. That is, numeral 11 in the figure is an operation display section, which is installed, for example, in a place where a conventional tape-type car stereo is installed (in or around the dash board), and is used to turn on the power and select a disk.

It has functions for performing various operations such as disc playback, stop, search operation, volume adjustment, and balance adjustment, as well as displaying the playback time 2, Nα of the selected disc, track number, etc.

Further, numeral 12 in the figure is a disc playback mechanism section, which is installed, for example, in the trunk of an automobile. This disk playback mechanism section 12 includes a disk storage section that accommodates a plurality of disks, and a system that selectively takes out a desired disk from the disk storage section, actually rotates the disk, and reads digitized data with an optical pickup. This includes a reproduction mechanism section that reproduces the audio data, and a signal processing circuit that reproduces the digitized data read by the reproduction mechanism section into the original audio signal.

Then, the operation display section 11 and the disc playback mechanism section 12
are connected by a signal transmission line 13.

In addition, the operation display section 11 and the disc playback mechanism section 12
When the engine of the automobile is driven or when the ignition key is set to the accessory position, power is supplied to the vehicle and the vehicle becomes ready to be driven.

Therefore, in the power supply state, the operation command output from the operation display section 11 is transmitted to the disc playback mechanism section 12,
The designated disc is taken out from the disc storage section to the playback mechanism section and played back, and data corresponding to the playback time, disk N0, track number, etc. output from the disk playback mechanism section 12 is displayed on the operation display section 11. The information will be transmitted to and displayed on the website.

Therefore, by separating the operation display section 11 and the disc playback mechanism section 12 as described above, it is possible to solve problems caused by the installation location and space, and to efficiently install a compact disc player in a car. It is something that can be installed.

[Problems in the Background Art] However, in the conventional disc playback device as described above, when the car engine is stopped and the ignition key is handled during disc playback, the operation display unit 11 and the disc playback mechanism unit 12 are disconnected from the power supply. Since the supply is no longer carried out, especially in the disc reproducing mechanism section 12, the disc 14 is left sandwiched between the turntable 15 and the disc clamper 16, as shown in FIG.

If the disc 14 is left in this state for many days, for example, a problem arises in that the disc 14 warps due to its own weight, as shown in FIG. Further, the temperature and humidity inside the trunk room are subject to rapid changes, and in particular, the temperature can reach, for example, +80° C. in the summer, which further accelerates the deformation of the disk 14.

In this case, depending on the magnitude of the warp, the disc 14 may become unplayable or unable to be returned to the disc accommodating section.

By the way, in order to prevent the above problem, the user should operate the operation display section 11 to return the disk 14 to the disk storage section before stopping the engine. However, the disc playback mechanism section 12 is located in the trunk room, and the disc 14 is not placed on the turntable 15.
Because it is difficult for the user to confirm that the disk 14 is still installed on the disk, it is possible for the user to forget to return the disk 14 to the disk storage section and stop the engine.
This is done very often in actual usage situations.

[Object of the Invention] The present invention has been made in consideration of the above circumstances, and provides an extremely good disc playback device that can protect the disc by automatically returning the disc being played back to the disc storage unit when the power is cut off. The purpose is to provide

[Summary of the Invention] That is, the disc playback device according to the present invention includes an operating section for setting a predetermined operation mode and a stop mode, and a disc reproducing device that is accommodated in a disc storage section in accordance with the operating mode set by the operating section. A disk playback mechanism section that transports the played disk to a playback compensation section and controls it to a predetermined operating state is configured separately, and data communication is always performed between the operation section and the disk playback mechanism section. The disc playback device includes a detection means for detecting a stop state of transmission of communication data from the operation unit to the disc playback mechanism, and a disc transported to the playback mechanism is returned to the disc storage unit in response to a detection output of the detection means. By including a control means, the disc being played back can be automatically returned to the disc accommodating section when the power is cut off, thereby protecting the disc.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 17 denotes an operation display section, which is installed, for example, in or around the dash board of an automobile. This operation display section 17 includes various operators for power-on, disc selection, disc playback, stop, search operation, volume adjustment, balance adjustment, etc., as well as playback time 9, Na of the selected disc, track number, etc. It has a display section etc. for displaying information.

On the other hand, numeral 18 in the figure is a disc playback mechanism section, which is installed, for example, in the trunk of an automobile. The disk playback mechanism section 18 includes a disk storage section 19 that accommodates a plurality of disks, a disk storage section 19 that selectively takes out a desired disk from the disk storage section 19, mounts the disk, rotates the disk, and an optical system (not shown). a playback mechanism section 20 that reads digitized data from the disk by moving a pickup in the radial direction of the disk; a playback mechanism section 20 that converts the digitized data read by the playback mechanism section 20 into an original audio signal; 19 and a signal processing control section 21 that controls the operation of the reproduction mechanism section 20.
and a detection section 22, which will be described later.

Further, the disk reproducing mechanism section 18 is always supplied with electric power from the power supply system of the automobile.

Then, the operation display section 17 and the disc playback mechanism section 18
and are connected by an optical fiber cable 23. Further, when the engine of the automobile is driven or when the ignition key is set to the accessory position, the operation display section 17 is supplied with power and placed in a driveable state by operating a power switch (not shown). This is the result.

Therefore, in the power supply state, the operation command output from the operation display section 17 is transmitted to the disc playback mechanism section 18,
The specified disc is taken out from the disc storage unit 19 to the playback mechanism unit 20 and the disc is played back, and the playback time is output from the disc playback mechanism unit 18.
Data corresponding to the disc number, track number, etc. is transmitted to the operation display section 17 and displayed.

Here, the operation display section 17 and the disc playback mechanism section 1
8 exchange data with each other at regular intervals in a state where power is supplied to the operation display section 17 and a predetermined operation mode is set by the operation display section 17. For example, when the same operation mode continues, this communication is performed by alternately and repeatedly sending the same data to each other at a constant cycle, so that communication is always continued.

The detection unit 22 detects the presence or absence of communication data transmitted from the operation display unit 17, and when the operation display unit 17 does not transmit communication data for a period longer than the fixed period, a signal is detected. A detection signal is sent to the processing control unit 21.
This outputs the number. In addition, the signal processing control section 2
1 receives the detection signal output from the detection unit 22,
It operates to automatically return the disc loaded in the playback tI structure 20 to its original position in the disc accommodating part 19.

Therefore, if the engine is stopped and the ignition key is removed during normal disc playback, the communication data sent from the operation display section 17 will be unilaterally interrupted. Therefore, a detection signal is generated from the detection section 22, and the disk loaded in the playback mechanism section 20 is automatically returned to its original position in the disk storage section 19.

FIG. 2 is a flowchart summarizing the above operations. That is, when power is turned on to the operation display section 17 in step S1, it is determined in step S2 whether or not communication data has been sent from the operation display section 17. If the communication data has not been sent (No), it waits until it is sent.

Further, if the communication data is sent out (YES), in step S3, the disc playback mechanism unit 18 takes out the disc from the disc storage unit 19 based on the operation command from the operation display unit 17, and plays the taken out disc. Mechanism section 20
It is possible to carry out operations such as attaching the music to a computer, searching for a desired song, and playing the music.

Furthermore, in this operating state, it is determined in step S4 whether or not communication data is being sent from the operation display section 17. Then, if the communication data is sent (YE
S), the operation in step $3 is continued, and if the communication data is no longer sent out, <No), in step S5, the disk loaded in the playback mechanism section 20 is returned to its original position in the disk storage section 19, and then communication is started. It is in a standby state until data is sent out.

Therefore, according to the configuration of the above embodiment, it is detected that the power supply is cut off and transmission of communication data from the operation display section 17 is unilaterally cut off, and the playback mechanism section 20 automatically Since the loaded disc is returned to its original position in the disc playback mechanism section 19, it is possible to prevent the disc from warping and protect the disc.

In addition, since the disc is removed from the turntable, the load on the disc motor due to the disc's own weight in a stationary state can be eliminated, and the playback mechanism section 2
This can also contribute to improving the reliability of 0.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] Therefore, as described in detail above, according to the present invention, a disc being played while the power is cut off is automatically returned to the disc accommodating section, and the disc can be protected, resulting in extremely good disc playback. equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a disc playback device according to the present invention, FIG. 2 is a flowchart for explaining the operation of the same embodiment, and FIGS. 3 and 4 respectively show a conventional disc playback device. FIG. 1 is a configuration diagram showing the device and a side sectional view for explaining the problems thereof. DESCRIPTION OF SYMBOLS 11... Operation display section, 12... Disc playback mechanism section, 13... Signal transmission line, 14... Disc, 1
5... Turntable, 16... Disc clamper, 17... Operation display section, 18... Disc playback mechanism section, 19... Disc storage section, 20... Playback mechanism section, 21... - Signal processing control section, 22..., detection section, 2
3...Optical fiber cable. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] An operation section for setting a predetermined operation mode and stop mode, and a control section that transports the disc accommodated in the disk storage section to a playback mechanism section and controls it to a predetermined operation state in accordance with the operation mode set with this operation section. In the disc playback device, the disc playback mechanism section is configured separately, and data communication is always performed between the operation section and the disk playback mechanism section. and a control means for returning the disc conveyed to the playback mechanism section to the disc accommodating section in accordance with the detection output of the detection means. disc playback device.