JPS63239664A - Disk player device - Google Patents

Abstract

PURPOSE:To access a required position of a disk within a short time by accessing a disk based on disk information stored in a storing means and reproducing the accessed contents. CONSTITUTION:The titled device is provided with a disk position detecting means 9 capable of detecting a prescribed position on a disk 2, a reading means 3 for reading out disk information every detected prescribed position of the disk 2 prior to the reproducing of the disk 2, a memory means (microcomputer memory) 10 for storing the read disk information correspondingly to the prescribed position, and a specifying means for specifying reproducing from an optional position of the disk. When reproducing from an optional position of the disk 2 is specified by the specifying means, the disk 2 is accessed based on the disk information to reproduce the contents of the disk. Thus, a required position of the disk 2 can be accessed within a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a disc player device that plays back, for example, a video disc.

(Prior Art) In recent years, optical video discs have been developed as DADs (digital audio discs), and disc player devices for playing these discs have become widespread.

By the way, in the above-mentioned video disc, like a compact disc, the lead-in area contains disc information called TOC (dock), which indicates where the beginning of each chapter of the program (hereinafter referred to as chapter) is located. Disc information such as the beginning position and length of each chapter (such as the beginning position and length of each chapter) cannot be found without playing the disc. While reading the address code recorded in the field with the pickup section of the disc player,
The pickup section is moved as fast as the address code can be read until the target chapter is reached, and the pickup section is moved to the beginning position of the chapter by track jumping or the like.

(Problems to be Solved by the Invention) However, in the conventional disc player device described above, when accessing a chapter of a video disc, it is necessary to move the pickup section to read the address code. For this reason, the address code is read when the speed of the pickup section is almost the same as that during disk playback, and the pickup section is moved at high speed to the position where the next address code is read. Therefore, in conventional disc player devices, tracking is required when reading the address code, and the speed must be very close to the rotation speed during playback, so there is a limit to the feed speed of the pickup section.
Particularly when accessing a chapter directly from the innermost to the outermost or from the outermost to the innermost of the disc, the address code must be read constantly or at very short regular intervals during the chapter access. The problem was that it was very time consuming.

The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a disc player device that can access a desired position on a disc in a short time.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides disc position detection means capable of detecting a predetermined position on the disc, and a disc position detecting means capable of detecting a predetermined position on the disc. reading means for reading disc information before each disc playback, storage means for storing the read disc information in correspondence with the predetermined position, and specifying means for designating playback from an arbitrary position on the disc. and when the specifying means specifies reproduction from any position on the disc, the disc is accessed and reproduced based on the disc information in the storage means.

(Function) According to the present invention, the disc is accessed and reproduced based on the disc information stored in the storage means, so that a desired position on the disc can be accessed in a short time.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a disc player device according to an embodiment of the present invention, and in the figure, reference numeral 1 designates a spindle motor for mounting and driving a disc 2. As shown in FIG. Reference numeral 3 denotes a pickup section which is a reading means for reproducing the disc 2. The pickup section 3 is supported by a guide shaft 4 and is movable in the radial direction of the disc 2. Further, the pickup section 3 is moved in the radial direction of the disk 2 by a pickup feeding mechanism 5. The pickup feed mechanism II 5 includes a feed motor 6, an intermediate gear 7 that transmits the drive of the feed motor 6, and a rack gear 8 that is moved by the intermediate gear 7 and is provided integrally with the pickup section 3. A slider volume 9 is meshed with the rack gear 8 and is a disk position detecting means for detecting the position of the pickup section 3 on the moved disk 2.

Further, FIG. 2 is a circuit diagram for explaining the slider volume 9, which is a disk position detecting means for detecting the moving position of the pickup section 3 shown in FIG.

As shown in the figure, the slider volume 9 is provided with a resistance volume 9a. And the slider pot voltage vb is changed by this resistance volume 9a.
are compared by a plurality of comparators Ca, Cb, . . . Cn corresponding to each predetermined position on the disk 2. Note that VA, VB, . . . VN are reference voltages.

Then, the position of the pickup section 3 on the disk 2 is detected by the output from each comparator Ca, Cb, etc., and the disk information at the time of the gate is stored in the memory 10 of the microcomputer, which is a storage means, in correspondence with the position. .

Therefore, for example, when detecting several positions between the outermost circumference and the lead-in position (innermost circumference) of a disk with a diameter of 30 CIl, for example, as shown in FIG. are the positions fia to r! from the resistance volume 9a of the slider volume '9. : It is possible to detect by setting the reference voltages ■^~■ of each comparator Ca~Ck according to the slider pot voltage vb at tk.

Note that the disk position detection means for detecting the moving position of the pickup section described above converts the slider pot voltage vb from the resistance volume 9a of the slider volume 9 into A/
It may be detected by inputting it to a D converter, or it may be detected by directly providing a leaf switch or the like at a position corresponding to digits fia to ik on the disk 2.

The operation of the disc player device configured as described above will be explained using the flowcharts shown in FIGS. 3 and 4.

In the disc player device of this embodiment, when the power is turned on and when the disc is removed,
The pickup section 3 is on standby at a position where the track king is aligned with the outermost circumferential position a of a 30 cl diameter disk. First, the disk 2 is set in the player main body (a in FIG. 4).Next, the disk 2 is driven by the spindle motor 1 (b in FIG. 4).Next, the pickup section 3 is driven by the feed motor 6 to It is moved from the outermost circumference a of No. 2 toward the lead-in position zk. At this time, position a
The moving speed of the pickup section 3 is set so that the address code can be read at each point from . In other words, the focus servo is applied at square position ia, the pickup section 3 is moved in the inner circumferential direction, the program area, that is, the tracking signal is read (c in Figure 4), and the microcomputer reads the address code from the tracking position. At the beginning (d in Figure 4), immediately before the lead-out signal, r! Read the maximum chapter of the disc from the address code of Lb.0 Then read the address code at each position from position c to position 2k on the inner circumference and store it in the memory 10 of the microcomputer (e in Figure 4), for example. , the lead-out code is read between positions b and c, and the maximum chapter number of the disc, for example 48, is read immediately inside the lead-out code.Furthermore, the pickup section 3 is sent to the inner circumference, and the lead-out code is read from position ic to J (k is the lead-out code). The chapter numbers of the in-code position) are 43 (position ic), 35.31.
Assume that 23.20.13.8.2 (position j) is read. This is stored in the memory 10 of the microcomputer, such as RAM. Note that the address code stored in the memory 10 is changed when the disk is ejected or when the power is turned off.
It is stored until it is FF.

In this state, the pickup section 3 is on standby at the innermost circumference of the disk 2. This is because the disc is usually played from the beginning, and when reading the address code of disc 2, the pickup unit 3 is continuously sent from the outermost circumference to the innermost circumference of the disc 2, and then the playback operation begins. This is a lick that is advantageous in terms of time in some cases.

Next, explanation will be given using the flowchart of FIG. 5 and FIG. 6 showing a memory table.

Then, suppose that the user specifies access to, for example, chapter 27 of disk 2 using a key on the remote controller (Fig. 5A).
Referring to FIG. 5B, it can be seen that chapter 27 is located between 7jle and Wf of disk 2 shown in FIG. Position i at the fastest speed within the allowable range
It is moved to f (chapter 23) and stopped (FIG. 5C), and from this position, the pick-up section 3 searches for the beginning position of chapter 27 while reading the address code (FIG. 5D).

Therefore, in this embodiment, the address code at a predetermined position on the disc 2 is read and stored before the disc 2 is played back, and based on this address code, the designated chapter is picked up by the pickup section 3 without reading the address code. Since the chapter is sent to the nearest chapter, and then the specified address is accessed, compared to conventional devices that search for chapters while reading the address.
Access time can be significantly reduced.

In the embodiment described above, before playing the disc, the maximum chapter number of the disc, the total number of frames,
Since the disc information such as the total time is stored in the memory, the stored disc information can be stored as shown in Fig. 7.
It is also possible to display each information on the disc on a television screen.

Furthermore, in this embodiment, before playing the disc, the pickup unit 3 is placed in standby at the outermost circumference of the disc, and the pickup unit 3 is moved from the outermost circumference to the innermost circumference of the disk to obtain disc information. As shown in the flowchart of FIG. 8, the pickup section 3 is placed on standby at the innermost circumference of the disk, and the pickup section 3 is moved from the innermost circumference to the outermost circumference of the disk to obtain disk information. It's okay.

Furthermore, in this embodiment, the case where a chapter access of a disc is performed has been explained, but frame access of a CAV disc (a disc in which signals are recorded at a constant rotation speed), and CLV disc (a disc in which signals are recorded at a constant linear velocity) is performed. may also be applied in the case of time access.
Further, although this embodiment has been described as an example using an optical disc, the present invention can also be applied to a capacitive video disc player.

[Effects of the Invention] As explained above, the disc player device of the present invention has the following effects:
Since the disc is accessed and reproduced based on the disc information stored in the storage means, a desired position on the disc can be accessed in a short time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining a disc player device according to an embodiment of the present invention, FIG. 2 is a circuit diagram for explaining the position detection means of FIG. 1, and FIG. A plan view for explaining the operation of the player device, FIG.
FIG. 5 is a flowchart for explaining the chapter access operation of the disc player device shown in FIG. 1, and FIG. 6 is a flowchart for explaining the memory table shown in FIG. 1. FIG. 7 is a diagram for explaining another embodiment of the present invention, and FIG. 8 is a flowchart for explaining still another embodiment of the present invention. ...Disc 3...Pickup section 9...Slider volume 9a...
・・・Resistance volume 10・・・・・・Memory agent Patent attorney Nori Ken Chika Yudo Hiroshi UjiFigure 1Figure 2Figure 3Mycosi data memoryFigure 6Figure 7

Claims (1)

[Claims] disc position detection means capable of detecting a predetermined position on the disc; reading means for reading disc information at each detected predetermined position on the disc before playing the disc; and matching the read disc information to the predetermined position. and a specifying means for specifying playback from an arbitrary position on the disk, and when the specifying means specifies playback from an arbitrary position on the disk, the disk in the storage means A disc player device characterized in that the disc is accessed and played based on information.