JPH01229456A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to reduce the cost by using a single disk detecting element as a disk detecting element for detecting the kind of a disk set in the device. CONSTITUTION:When a disk detecting signal for acknowledging the set state of disks 2 and 4 from the disk detecting elements 28 and 30 is given to a central control means, a moving control signal is given to a pickup moving means, and a pickup 14 is controlled to move toward the innermost circumference of the disk. When the movement of the pickup is detected by innermost circumferential position detecting elements 24 and 26, an innermost circumferential position detecting signal is outputted to the central control means. By this central control means, a total recording time of the disk 2 or 4 is read out from its information signal read by the pickup 14, while a decision is made as to whether the device is under the setting state of a regular disk or the setting state of a small size disk (single disk). Consequently, the only requirement is that single disk detecting elements 28 and 30 are provided underneath the single disk. By this method, the number of the detecting elements 28 and 30 can hence be reduced.

Description

Detailed Description of the Invention (Technical Field) The present invention uses a pickup to pick up two
The present invention relates to a disc playback device that reads information recorded on each disc.

(Conventional technology) FIG. 4 is a schematic diagram of a conventional disc playback device.

In the figure, reference numerals 2 and 4 denote first disks each having a disk shape and having a plurality of tracks on one side of which information such as a music program is recorded. This is the second disc. There are two types of these disks: normal-sized disks (discs with a diameter of 12 cm, referred to as normal disks in the following explanation) and small-sized disks (discs with a diameter of 8 cm, referred to as single disks in the following explanations). .

), but in Fig. 4, the disks are normally placed side by side. Both disks 2, 4 are each driven by a spin motor 6.
They are juxtaposed at a predetermined distance from each other on a turntable (not shown) attached to the rotation axis IO,+2 of the 8. 14 is a pickup that reads information recorded on each track of the disk 2.4 and outputs the read output as an information signal Sl; I6 is a rail that serves as a guide when moving the pickup 14 along the juxtaposed direction. , 18 is a slide motor that drives the pickup 14 along the rail 16 in accordance with the applied drive signal S2 while controlling the direction and amount of movement thereof; 20 is the rotation shaft 2 of the slide motor 18;
This belt is connected to the pickup 2 and converts the direction and amount of rotation of the slide motor 18 into the moving direction and moving type of the pickup 14 and transmits the same. 24 and 26 each have a contact that is turned on by being pushed by the outer wall of the pickup 14 when the pick-up knob 14 is located at the innermost circumference side of the disks 2 and 4, and when the contact is turned on, the first ．． Second innermost position detection signal S3. The first one outputs S4. This is the second innermost position detection element. 28.3
0 is a disk detection element (single disk detection element) arranged vertically below the single disk in order to detect the set state of the single disk,
When it is detected that a single disc is set, the first and second single disc detection signals S5. S6 is output respectively. 32 and 34 are disk detection elements (ordinary disk detection elements) that are placed at positions facing only vertically below the ordinary disk in order to detect the set state of the ordinary disk. When detecting, first. Second ordinary disk detection signal S7. S8 is output respectively. Each of these detection elements detects the set state of the disk in a non-contact manner, and is composed of, for example, a photointerrupter.

FIG. 5 is a block circuit diagram of a conventional disc playback device having the above configuration. In FIG. 5, 36 is a signal processing circuit that processes the information signal S1 from the pickup 14;
38 is the output S9 from the signal processing circuit 36 and the innermost position detection signal S3. S
4 and the single disk detection signal S5.4 from the single disk detection element 28.30. S6, and the normal disk detection signal S7. from the normal disk detection elements 32.34. S8
It is a central control means constituted by a microcomputer that is given a movement control signal S10 and outputs a movement control signal S10 to the slide mode control circuit 40. The slide motor control circuit 40 receives a movement control signal S from the central control means 38.
A drive signal S is sent to the slide motor 18 in response to the IO.
2, and together with the rail 16, slide motor 18, and belt 20 constitutes a pickup moving means.

The operation of the central control means 38 in the conventional disc playback device having the above configuration will be explained.

When the pickup I4 at the current track position within the same disk is moved to the target track position, the central control means 38 uses the disk information contained in the information signal Sl from the pickup 14 provided via the signal processing circuit 36. Based on the current track number and time information, the pickup moving means including the slide motor control circuit 40 is controlled to move the pickup 14 to its target track position at low speed.

Next, when moving the pickup 14 from the current track position on one, for example, the first disk 2 to the target track position on the second disk 4, the central control means 38 first moves the pickup I4 to the first disk 2. Detection of the innermost circumference position is performed by moving the second disk 4 at a low speed from the current track position of No. In response to the signal S4, the pickup 14 is similarly controlled to move at a low speed via the pickup moving means toward the target track position.

By the way, in a conventional disc playback device that operates as described above, it is determined whether the set disc is a single disc or a normal disc as shown in the flowchart of FIG. This will be explained. First, in step nl, the central control means 38 generates a single disc detection signal S5. from the single disc detection element 28.30. If S6 is not obtained, it is processed as a disk non-set state in step n2, and the single disk detection signal S5. When S6 is obtained, the process advances to step n3. In this step n3,
Ordinary disk detection signal S7. from ordinary disk detection element 32.34. If S8 is not obtained, the process advances to step n4, where a setting process is performed to determine that a single disc is set. Also, at step n3, the normal disk detection signal S7. When S8 is obtained, a setting process is performed to determine that a normal disk is set.

In this way, in the conventional disc playback device, a total of 4
The type of disc set is determined using a large number of detection elements, but since there are a large number of detection elements, not only does the component cost become high, but the large number of components also makes it necessary to In addition, the central control means is usually composed of a microcomputer, and in that case, it is difficult to receive the signal output from the detection element. It was necessary to select a microcomputer that had an input port that could be used, and this imposed major design constraints.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and it is possible to reduce component costs and wiring costs by reducing the number of disk detection elements, and to overcome restrictions on microcomputer selection. The aim is to enable mitigation.

(Structure of the Invention) In order to achieve such an object, the present invention provides a pickup that reads information signals recorded on each of two disks juxtaposed at a predetermined set position, and a pickup that reads information signals recorded on each of two disks juxtaposed at a predetermined set position, and a pickup moving means for moving the pickup in the juxtaposed direction in response to a signal; detecting that the pickup has been moved to the innermost position of the disk by the pickup moving means and outputting an innermost position detection signal; The innermost circumference position detection element is placed in a position that can detect both the set state of a small-sized disc (single disc) and the set state of a normal-sized disc (regular disc), and the disc corresponds to the set state of the disc. The central control means includes a disk detection element that outputs a detection signal, a central control means that controls the output of a movement control signal to the pickup moving means, and operates in response to the innermost circumferential position detection signal and the disk detection signal. When a disk detection signal is given from the disk detection element to set the disk, a movement control signal is given to the pickup moving means to control the movement of the pickup in the direction of the innermost circumference of the disk, and the pickup is moved toward the innermost circumference of the disk. When the innermost circumferential position detection signal is given from the circumferential position detection element, the total recording time of the disc is read from the read information signal given from the pickup, and the total recording time is set based on the read total recording time. It is characterized by the ability to determine whether the disc currently in use is a regular disc or a single disc.

In this configuration, when a disk detection signal for setting a disk to the central control means is applied from the disk detection element to the central control means, a movement control signal is applied from the central control means to the pickup moving means. The pickup moving means controls the movement of the pickup toward the innermost circumference of the disk in response to the movement control signal. When the innermost circumference position detection element detects that the pickup has been moved to the innermost circumference of the disk, an innermost circumference position detection signal from the innermost circumference position detection element is output to the central control means. . When the central control means is given the innermost circumference position detection signal, the central control means reads the total recording time of the disc from the read information signal of the pickup, and determines whether the normal disc is in the set state based on the read recording time. , determines whether a single disk is set.

Therefore, in the present invention, the configuration of the disk detection element only requires providing a single disk detection element on the bottom surface of a single disk, and the number of detection elements can be reduced by the number of ordinary disk detection elements compared to the conventional method. Can be done.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a disc reproducing apparatus according to an embodiment of the present invention, and parts corresponding to those in FIG. 4 are given the same reference numerals. In FIG. 1, 2.4 are respectively 1. Second disk, 6.8, spin motor, 10.1
2 is the rotating shaft of the spin motor 6.8, 14 is the pickup, 16 is the rail, 18 is the slide motor, 20 is the belt, 22 is the rotating shaft of the slide motor 18, 24.26 is the first... The second innermost circumferential position detection element, 28°30, is the first. This is a second single disk detection element. The above configuration is the same as the conventional one.

The present embodiment is characterized in that the normal disk detection element is omitted from the above configuration, and it also has the following configuration. That is, in this embodiment, before the pickup 14 passes between the two disks 2.4 from one disk to the other disk, or from the other disk to the other disk, the level is high, for example, and after passing, is a pickup position detection element 42 that outputs a pickup position detection signal Sll that changes to a low level, for example.
is provided between disks 2 and 4. That is, if the signal S11 from the pickup position detection element 42 is at a high level, the pickup 14 is located on one disk side, and if it is at a low level, it is located on the other disk side. Therefore, the central control means 38 receives the signal S from the pickup position detection element 42.
It is possible to determine which disk side the pickup 14 is located on based on the level change of ll.

A specific example of such a pickup position detection element 42 is, for example, a detection element that can detect the passage of the pickup 14° in a contact or non-contact manner (if it is a contact type, for example, a switch or a non-contact detection element). It is conceivable to configure the sensor with a magnetically sensitive or optically sensitive element) and a circuit whose output changes between a high level and a low level in response to a change in the output of the detection element. If the pickup 14 has a contact type detection element, the pickup 14 may have a structure in which the detection element is placed in contact with the detection element, or if the pickup 14 has a non-contact detection element, it may be placed in a position that makes contact with the detection element. It is conceivable to have a structure in which magnetism or light is applied to the detection element as it passes.

FIG. 2 is a block circuit diagram of a disc reproducing apparatus according to an embodiment of the present invention, and parts corresponding to those in FIG. 5 are given the same reference numerals. In FIG. 2, 36 is a signal processing circuit;
8 is a central control means, and 40 is a slide motor control circuit. The above configuration is basically the same as the conventional one shown in FIG.

The present invention has the above-mentioned basic configuration provided with a signal delay circuit 44 that delays the pickup position detection signal Sll from the pickup position detection element 42 by a predetermined time and outputs the delayed output S12 to the central control means 38. It has characteristics.

Next, the operation of this embodiment having the above configuration will be explained with reference to the flowchart of FIG.

First, in step #1, the central control means 38
．． Single disk detection signal S5. from the second single disk detection element 28°30. The set state of the disk 2.4 is determined based on S6, and if it is determined that it is in the non-set state, the process moves to step #2, and the disk detection process is ended as the disk is in the non-set state.

On the other hand, if it is determined in step #1 that the disk 2.4 is in the set state, the process moves to step #3. In this step #3, the disk 2 that is set
．． Read the total recording time of step 4. For this reading, the central control means 38 uses the movement control signal SIO to move the pickup 14 toward the innermost circumference of the disk 2.4 using the pickup moving means including the slide motor control circuit 40, and then detects the innermost circumference position. Innermost position detection signal S3. from elements 24 and 26. When S4 is given, the movement of the pickup 14 is stopped, and the total recording time T of the disk 2.4 is read from the information signal from the pickup 14 given via the signal processing circuit 36 at that position. I have to.

In this way, in step #3, disk 2.
After reading the total recording time T of 4, step #
4, it is determined whether the total recording time T exceeds the basic time Ts, for example, 20 minutes in the case of a single disc (TNTs determination). As a result of this determination, if the total recording time T is less than or equal to the reference time Ts, the process proceeds to step #5, where it is determined that the set disc is a single disc, and the disc detection process is ended. If it is determined that the total recording time T exceeds the reference time Ts, the process proceeds to step #6, where the set disc is determined to be a normal disc and the disc detection process is ended.

As described above, the set state of the disc is detected and whether the set disc is a single disc or a normal disc is detected.

Next, the operation of controlling the movement of the pickup 14 from one disk (for example, the first disk 2) to the other disk (for example, the second disk 4) to access a target trunk will be described.

(1) From the operation shown in the flowchart in Figure 3 above,
First, when the second disc 4 set is a single disc.

The central control means 38 outputs a movement control signal SIO to the slide motor control circuit 40 to control the movement of the pickup 14 toward the innermost circumference of the second disk 4.

As a result, the pickup 14 is moved toward the innermost circumference of the second disk 4, but the pickup 1
4 reaches the innermost position of the second disk 4,
This is detected by the second innermost position detection element 26, and the innermost position detection signal S4 from the second detection element 26 is input to the central control means 38.

When the innermost circumference position detection signal S4 is input, the second
A search operation for a target track on the disk 4 begins.

(11) From the above operation, the set second disk 4
In this case, the pickup 14 either moves from the first disk 2 toward the second disk 4, or passes between the two disks 2.4 on the way. At this time, a pickup position detection signal Sll is outputted from the pickup position detection element 42, and the signal Sll is delayed by a predetermined time in the signal delay circuit 44 and given to the central control means 38 as an output S12. Then, the central control means 38 moves the pickup 14 at high speed until the output S12 is applied, that is, until a predetermined period of time has elapsed since the pickup position detection signal Sit was applied.
When the predetermined time has elapsed, the pickup 14 is stopped. Then, from the stopped pickup 14, time information and track position information of the second disk 4 at the stopped position are provided to the central control means 38 via the signal processing circuit 36. The central control means 38 searches for a truck while moving the pickup 14 at low speed based on the information. Note that the predetermined time in this embodiment is the timing at which the pickup 14 moves from one disk to the other disk and moves to 1/2 of the radius from the end of the other disk. This is the time set accordingly. In this way, even if the second disc 4 is a regular disc, the target track can be searched in an extremely short time.

(Effects of the Invention) As described above, according to the present invention, since the disc detection element for detecting the type of the set disc is configured to use only a single disc detection element instead of using a normal disc detection element, it is possible to use only a single disc detection element. Since the number of parts is reduced, it is possible to reduce the cost of parts, and the wiring for the parts is also simplified to the extent that the number of parts is reduced, and as a result, the cost of the wiring is also reduced. Furthermore, when the central control means is configured with a microcomputer, the restriction on the human power port is eased to the extent that the normal disk detection element is eliminated, and the selection of the microcomputer is facilitated.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a disc reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a block circuit diagram of the embodiment, and FIG. 3 is a flowchart for explaining the operation of the embodiment. Figure 4 is a schematic configuration diagram of a conventional disc playback device;
The figure is a block circuit diagram of the conventional example, and FIG. 6 is a flowchart for explaining the operation of the conventional example. 2.4...Disk, 6.8...Spin motor, 14
...Pickup, 18...Slide motor, 24
゜26...Innermost circumference position detection element, 28.30...Single disk detection element, 36.Signal processing circuit, 38.
...Central control means, 40...Slide motor control circuit, 42...Pickup position detection element, 44...Signal delay circuit.

Claims (1)

[Claims] (1) A pickup that reads information signals recorded on each of two disks juxtaposed at a predetermined set position, and a pickup movement that moves the pickup in the juxtaposed direction in response to a given movement control signal. means, an innermost circumference position detection element that detects that the pickup has been moved to the innermost circumference position of the disk by the pickup moving means and outputs an innermost circumference position detection signal; and a small-sized disk (single disk). a disk detection element that is arranged at a position where it can detect both the set state of the disk and the set state of a normal-sized disk (normal disk) and outputs a disk detection signal corresponding to the set state of the disk; The central control means controls the output of a control signal and operates in response to the innermost circumferential position detection signal and the disk detection signal, and the central control means receives a disk detection signal from the disk detection element to set the disk in a set state. When the pickup is given, a movement control signal is given to the pickup moving means to control the movement of the pickup in the direction of the innermost circumference of the disk, and when the innermost circumference position detection signal is given from the innermost circumference position detection element. reads the total recording time of the disc from the read information signal given from the pickup, and determines whether the set disc is a normal disc or a single disc based on the read total recording time. A disc playback device featuring: