JP2610933B2 - Disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is intended to enable a single optical pickup to selectively read information signals recorded on each of two disks arranged side by side. This is related to a twin-type disc player.

<Prior Art> As shown in FIG. 3, which shows a schematic configuration, a disc player of this type has discs 1, 2 arranged side by side.
Are independently driven to rotate by the respective spin motors 3 and 4. A single optical pickup 5 that optically reads information recorded on each of the disks 1 and 2 and outputs the information as an electrical information signal is provided along a guide rail 6 in a direction in which the disks 1 and 2 are juxtaposed. Be moved.

A pickup moving means for controlling the moving direction, moving speed and moving amount of the pickup 5 includes a slide motor 7 serving as a drive source whose rotation is controlled by a drive signal, and a bridge between the motor shaft of the slide motor 7 and the guide rail 6. A belt 8 that transmits the rotation of the slide motor 7 to the guide rail 6 and a motor control circuit (described later) that supplies a drive signal to the slide motor 7 are configured.

In a normal disc information reading mode, the disc player optically reads information recorded on any one of the discs 1 and 2 by a pickup 5, and detects a track number or a track number included in the read information. The position of the pickup 5 is controlled by the rotation of the slide motor 7 by a drive signal based on time information or the like, and an information signal of a desired track is read.

FIG. 4 shows a block configuration of a control system having the configuration shown in FIG. 3. The information signal output from the pickup 5 is processed by a signal processing circuit 9 and input to a microcomputer 10 as control means. You. The microcomputer 10 has an input / output port 10a, a CPU (central processing unit) 10b, a ROM
10c and a RAM 10d. In response to an information signal input from the signal processing circuit 9, the pickup 5
Output the movement control signal S1 for controlling the stop, movement amount, movement direction and movement speed of the slide motor control circuit
A drive signal S2 is output to the slide motor 7 in response to the movement control signal S1 to which 11 is input. On the other hand, the display means 12 displays the information read by the pickup 5 in response to the display signal S3 input from the microcomputer 10.

Next, an initialization processing operation in a conventional disc player having the configuration shown in FIGS. 3 and 4 will be described. First, when the power of the disk player is turned on, the microcomputer 10 sends the pickup 5 to the slide motor control circuit 11 by the first disk 1.
The movement control signal S1 to be moved to the side is output. Then, the presence / absence information signal of the first disk 1 and other disk information signals read by the pickup 5 moved to the first disk 1 side are processed by the signal processing circuit 9 and then stored in the RAM 10 d of the microcomputer 10. The information is stored and displayed on the display means 12 by the display signal S3 from the microcomputer 10.

Further, the microcomputer 10 includes a pickup 5
Is moved to the opposite side of the second disk 2, and the presence / absence information of the second disk 2 and other disk information are stored in the RAM 10d and displayed on the display means 12 as described above. By detecting the presence or absence of the disks 1 and 2 on both sides in advance in this way, it is possible to prevent an erroneous operation such as trying to perform a reproducing operation on a side where the disks 1 and 2 do not exist.

<Problems to be Solved by the Invention> However, in the above-described initialization processing, even when the disc 1 or 2 is set and used in only one of the discs, the pickup 5 is used for both the discs 1 and 2
The time required for the initialization process is unnecessarily long due to the useless movement of the pickup 5 to the side where the presence or absence of the disks 1 and 2 is not required to be detected. Cannot be quickly shifted to the next operation mode. This slow responsiveness is one of the factors that degrade usability in a disc player. However, if the presence / absence detection of the disks 1 and 2 is omitted during the initialization processing, there is a possibility that an erroneous operation such as starting a reproducing operation on the side where the disks 1 and 2 do not exist as described above may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the related art, and provides a disk player capable of detecting presence or absence of both disks instantaneously and shortening the time required for initialization processing as much as possible. It is the purpose.

<Means for Solving the Problems> A single optical pickup for reading information signals recorded on each of two disks arranged side by side, a signal processing circuit for processing information signals read by the pickups, A pickup moving means for moving the pickup to a target position in the juxtaposition direction of the respective discs by a movement control signal, and an information signal input from the signal processing circuit and outputting the movement control signal to the pickup moving means. A disc player comprising: a disc presence / absence detection means for detecting presence / absence of a disc on both sides of the disc, wherein the control means performs the initialization by the disc presence / absence detection means. Move the pickup to the side where the disc exists based on the detection result It outputs a movement control signal to be performed.

<Operation> If, for example, a photo interrupter is provided as a pair of disk presence / absence detection means, it is possible to optically instantaneously detect which disk arrangement position has a disk,
As a result, the time required for disc detection can be greatly reduced, and malfunctions such as entering the reproduction start mode on the side where no disc is present can be reliably prevented. Then, a disk presence / absence detection signal from each disk presence / absence detection unit is input to the control unit, and the control unit determines both disk presence / absence detection signals and outputs a movement control signal for moving the pickup only to the side where the disk exists. In addition, since these operations of the control means are performed during the initialization processing, for example, it is possible to quickly shift from the power-on to the reproduction start mode.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a block configuration according to an embodiment of the present invention. In FIG. 1, the same or equivalent components as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. 4 is different from FIG. 4 in that disk presence / absence detection means 13 and 14 for detecting presence / absence of the corresponding disks 1 and 2 are provided on both disks 1 and 2 respectively. The configuration is such that disk presence / absence detection signals S4 and S5 as detection results respectively output from the channels 13 and 14 are input to the microcomputer 10. It is preferable to use a photo-interrupter or the like as each of the disc presence / absence detection means 13 and 14.
What is necessary is just to provide in the setting position of 1 and 2, facing each other.
In this embodiment, the arrangement of the two disks 1, 2 and the drive mechanism of the two disks 1, 2 and the drive mechanism of the pickup 5 are the same as those shown in FIG.

Further, another feature of the present invention lies in the functional configuration of the microcomputer 10 that performs signal processing on the respective disk presence / absence detection signals S4 and S5 of the both disk presence / absence detection means 13 and 14.
The ten functional configurations will be described with reference to the flowchart of FIG.

That is, when the power of the disc player is turned on, a program for the initialization process is executed. First, first
The presence / absence of the first disk 1 is determined based on the first disk presence / absence detection signal S4 input from the disk presence / absence detecting means 13 (step (A)). The information of "Yes" or "No", which is the result of this determination, is
10 (Step (B)) or [Step (I)] stored in the RAM 10d and displayed on the display means 12.

Then, even if one of the determination results is obtained, the presence / absence of the second disk 2 is determined based on the second disk presence / absence detection signal S5 input from the second disk presence / absence detecting means 14 subsequently. [Step (C)] or [Step (J)]. As a result of this determination, when the information of "present" is obtained, the information is stored in the RAM 10d and displayed on the display means 12 [Step (D)] or [Step (K)]. Similarly, when the information of "none" is obtained, the information is stored in the RAM 10d and displayed on the display unit 12 [Step (G)] or [Step (M)].

As a result of the operation for detecting the presence / absence of both disks 1 and 2 as described above, if both disks 1 and 2 are present, the information reading mode of one of disks 1 and 2 is set [Step (E)]. ], The set target disc 1
Alternatively, the pickup 5 is moved toward 2 [Step (F)]. If only the presence of the first disk 1 is detected, the information reading mode of the first disk 1 is set (step (H)), and the pickup 5
Is moved toward the target track position of the first disk 1 (step (F)). On the other hand, when only the presence of the second disk 2 is detected, the information reading mode of the second disk 2 is similarly set (step (L)), and the pickup 5 determines the purpose of the second disk 2. The track is moved toward the track position (step (F)). If neither of the disks 1 and 2 is detected, stop processing is performed [step (N)] to prevent malfunction.

<Effects of the Invention> As is clear from the above, according to the disc player of the present invention, the time required for disc detection can be greatly reduced, and a malfunction such as entering the reproduction start mode on the side where no disc is present. Can be reliably prevented, and by shortening the time, for example, it is possible to quickly shift from the power-on to the reproduction start mode.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart of FIG. 1, and FIG. 3 is a twin type disk which is a premise of the present invention.
FIG. 4 is a block diagram of a conventional player. 1,2 Disc 5 Pickup 7 Slide motor (Pickup moving means) 9 Signal processing circuit 10 Microcomputer (Control means) 12 Display means 13,14 Disc presence detection means

Claims (1)

(57) [Claims] 1. A single optical pickup for reading information signals recorded on each of two juxtaposed disks, a signal processing circuit for processing the information signals read by the pickup, and a movement control signal Pick-up moving means for moving the pickup to a target position in the juxtaposition direction of the respective disks, and control means for receiving an information signal from the signal processing circuit and outputting the movement control signal to the pick-up moving means. In the disc player comprising: a disc presence / absence detection means for detecting presence / absence of a disc at each of the positions where the two discs are arranged; wherein the control means, during an initialization process, discs of the respective disc presence / absence detection means Determine the presence / absence detection signal and pick up the pickup on the side where the disc exists. Disc player and outputs a movement control signal for moving the.