JP2003173605A - Disk loading mechanism for disk recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk loading mechanism for a disk recording and reproducing device which contributes to the reduction of a manufacturing cost by forming the mechanism in such a manner that the mechanism can be easily assembled with simple constitution even if the constitution to make the exact and sure detection of the position of a disk tray possible by a single tray position detecting switch is adopted. <P>SOLUTION: The disk loading mechanism has the disk tray 3 which is disposed to convey the disk to a disk mounting position and a disk discharging position and has trigger sections 10 and 11 in two-point positions along a conveyance direction, a disk tray conveyance mechanism 17 which transmits the rotational moving force of a forward and backward rotatable motor 14 for driving conveyance to linear motion and transmits this motion to the disk tray 3, the tray position detecting switch 2 which detects the trigger sections 10 and 11 respectively existing in the disk mounting position and the disk discharging position and a control section 12 which stops the motor 14 by the input of the detection signal from the detecting switch 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DVD (Digital Versatile Disk) or C as a recording / reproducing medium.
In a disc recording / reproducing apparatus such as a D (compact disc), a disc is mounted on a disc tray which moves between a disc mounting position and a disc ejecting position,
The present invention relates to a disc loading mechanism for loading or unloading a disc into or from a recording / reproducing apparatus.

[0002]

2. Description of the Related Art In a disc loading mechanism for loading and unloading a disc with a disc tray, the disc tray has three positions: a disc ejection position (EJECT position), a disc loading position (IN position), and a midway conveyance position between them. It is necessary to discriminate which one of them is located. This is an EJEC that is simply turned on and off by a pressing operation and an operation release as an operating means for inputting a command for driving a disk tray in a disk loading mechanism of this type.
A T / IN switch is generally provided, and when this switch is turned on, the disc tray is moved toward the position opposite to the current position, so that the current position of the disc tray is always grasped. This is because it is necessary to keep it and because it is necessary to stop the positioning when the disc tray is moved to the disc mounting position or the disc ejecting position. Conventionally, two single contact type tray position detection switches are provided for detecting the disc ejection position and for detecting the disc mounting position.

However, in the above-mentioned disc tray position detecting means, a single contact type tray position detecting switch is used.
Since the two switches are arranged, a space for two switches is required, and the number of parts including the wiring member is increased, which complicates the device configuration and tends to increase the manufacturing cost. On the other hand, a disc tray position detecting means using a two-contact type tray position detecting switch having a first contact and a second contact is also known, but the two-contact type tray position detecting switch has a large switch body. Not only does it require a large installation space, but the number of parts including peripheral members is large and the manufacturing cost is high, which is similar to the above-mentioned drawbacks. Therefore, a disc loading mechanism has been proposed in which the position of the disc tray can be detected based on a single tray position detection switch and the voltage application history of the loading motor (Japanese Patent Laid-Open No. 11-25.
557).

In the above-mentioned disc loading mechanism, the transport means for transporting the disc tray between the disc ejection position and the disc mounting position is a loading motor capable of rotating in the forward and reverse directions, and the rotational power of the loading motor is applied to the disc tray. And a reduction gear train including a cam gear 1 shown in FIG. 5A for converting and transmitting the power to the linear movement. As shown in FIGS. 5B to 5D, a single contact type tray position detection switch 2 for detecting the position of the disc tray is provided in the vicinity of the cam gear 1. On the bottom of the cam gear 1,
An uneven cam surface having a pair of protrusions 1a and 1b is formed,
The tray position detection switch 2 has a contact actuator 2 a of its own, and any one of the protrusions 1 a,
It is turned on by being pressed by 1b. Figure 5 (b)
(D) to (d) show a state in which the tray position detection switch 2 is turned on at the disk carry-out position, turned off at the intermediate position, and turned on at the disk mounting position, respectively.

In the above disc loading mechanism, the position of the disc tray is not known when the power is turned on. Therefore, when the tray position detection switch 2 is in the ON state when the power is turned on, the control microprocessor has the disc loading direction with respect to the loading motor. If a voltage is applied to drive the disc for a certain period of time and the above switch remains on, it is determined that the disc tray is in the disc eject position, and if the switch changes to the off state, the disc It is determined that the tray is located at the disc mounting position. If the current position of the disc tray can be specified as described above, thereafter, each time the EJECT / IN switch is turned on, the tray position found immediately after the power is turned on and the history of voltage application to the loading motor after that are referred to. Then, the disc tray is controlled so as to be conveyed to the disc mounting position when it is at the disc ejecting position and to the disc ejecting position when it is at the disc mounting position.

[0006]

The disc loading mechanism can detect three types of tray positions by using only one single contact type tray position detecting switch 2, and therefore has the advantage of simplifying the entire mechanism. . On the other hand, in the above disc loading mechanism, the cam gear 1 needs to be processed and manufactured with extremely high precision, which is expensive, and since the cam gear 1 and the disc tray need to be assembled at an accurate relative position, the manufacturing cost is also high. There are challenges.

That is, the cam gear 1, which is one of the constituent elements of the tray transporting means, is a relatively small member, and the disc trays are located at the disc mounting position and the disc ejecting position, respectively, on the lower surface of the small space. At the time point, the contact position actuator 2a is contacted and the tray position detection switch 2 is surely turned on.
Since it is necessary to form 1b, it is necessary to perform precise processing with high precision when forming the uneven cam surface, which is expensive.

Further, the cam gear 1 converts the rotational movement of itself into a linear movement and transmits the linear movement,
Since the relative positions must be accurately positioned and assembled so that the tray position detection switch 2 is surely turned on when the disc tray moves to the disc mounting position and the disc ejecting position, respectively, it takes time and effort for the assembling. Manufacturing cost is high. If the relative position between the cam guide 1 and the disc tray is not accurately positioned, the disc tray will be stopped in front of a predetermined disc mounting position or disc ejection position, and a recording operation on the disc will be performed. Or, a problem occurs that the reproducing operation cannot be performed accurately.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure while the position of the disc tray can be accurately and surely detected by a single tray position detection switch. It is an object of the present invention to provide a disc loading mechanism of a disc recording / reproducing apparatus which can be easily assembled and can reduce the manufacturing cost.

[0010]

In order to achieve the above-mentioned object, the invention according to claim 1 is to mount a disk for a transport drive capable of forward and reverse rotation, a disk for recording and reproducing medium, and a disk mounting position and a disk. A disk tray that is linearly movable between an eject position, a disk tray transfer mechanism that converts the rotational power of the transfer drive motor into a linear motion of the disk tray, and transfers the linear motion to the disk tray; A single tray position detection switch that detects that the tray has been moved to the disc mounting position and the disc ejection position and outputs a detection signal, and for the conveyance drive by inputting the detection signal from the tray position detection switch The rotation of the motor is stopped and the disc tray is transported either in the disc loading direction or the disc ejection direction when the power is turned on. In the disc loading mechanism of the disc recording / reproducing apparatus, the control unit drives the transport driving motor so as to identify the position of the disc tray based on the output change of the tray position detection switch at that time. The tray position detection switch is arranged at a position close to the disc tray along the transport direction thereof, and the tray position detection switch is provided on the disc tray when the disc loading position and the disc ejection position are respectively located. A pair of trigger projections to be detected are arranged at positions along the transport direction, and the control unit has a memory for storing the position information of the disc tray specified when the power is turned on. Is characterized by.

In the disc loading mechanism of this disc recording / reproducing apparatus, since a pair of trigger projections are provided in a wide space of the disc tray, which is a relatively large member, precision is not required so much, and therefore machining is remarkably performed. Easy to. Further, the disc tray may be set so as to project the trigger projections at two positions facing the position where the tray position detection switch is disposed when the disc tray is moved to the disc loading position and the disc ejecting position, respectively. As compared with the conventional case where the concave / convex cam surface is formed on the cam gear that converts the rotational movement of itself into linear movement and transmits it to the disc tray, it can be manufactured at low cost without requiring highly accurate setting.

On the other hand, at the time of assembly, since the tray position detecting switch is directly positioned and arranged with respect to the linearly moving disc tray, the relative position between the tray position detecting switch and the disc tray can be easily and accurately positioned. . Moreover, since the tray position detection switch detects the pair of trigger projections of the disc tray that have moved to the disc loading position and the disc ejecting position, respectively, it is turned on unless the disc tray moves accurately to the disc loading position and the disc ejecting position. Therefore, the disc tray can be accurately positioned.

Further, the disc loading mechanism of the disc recording / reproducing apparatus according to the second aspect of the present invention carries the disc of the recording / reproducing medium and linearly moves it so as to convey the disc to the disc mounting position and the disc ejecting position. The rotation power of the disk tray provided and provided with the trigger portions at two positions along the transport direction and the forward / reverse rotatable transport drive motor is converted into a linear motion of the disk tray and transmitted. Disc tray transport mechanism, a single tray position detection switch that detects the trigger portion and outputs a detection signal when the disc tray moves to the disc mounting position and the disc ejection position, respectively, and the tray position detection A control unit for stopping the rotation drive of the transport drive motor by inputting the detection signal from the switch. It is characterized in that it is.

According to this structure, the disc tray having the pair of trigger portions can be easily processed, and the disc tray can be manufactured inexpensively without requiring highly accurate setting.
Further, at the time of assembly, since the tray position detection switch is directly positioned and arranged with respect to the linearly moving disc tray, the relative position between the tray position detection switch and the disc tray can be easily and accurately positioned.

Further, the disc loading mechanism of the disc recording / reproducing apparatus according to the third aspect of the present invention further comprises a memory, and the control section causes the disc tray to move in either the disc loading direction or the disc ejecting direction when the power is turned on. The transport drive motor is driven to transport, the position of the disc tray is specified based on the output change of the tray position detection switch at that time, and the disc tray position is stored in the memory, and then a tray drive command signal from the tray operation switch. Each time is input, the tray position information is read from the memory, the disc tray is conveyed to a position in the direction opposite to the tray position information, and then the tray in the direction opposite to the reading direction is read from the memory. The position information is controlled to be updated and stored in the memory.

According to this structure, if the position of the disc tray is specified and stored in the memory when the power is turned on, each time the tray operation switch is operated thereafter, the tray position information of the memory is read and the disc tray position information is read out. Since the transport direction is set and the tray position information in the memory is updated and stored after transporting the disc tray, the disc is referred to with the history of voltage application to the transport drive motor each time the tray operation switch is operated as in the past. The process for determining the tray transport direction is unnecessary.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing a schematic configuration of a disc loading mechanism of a disc recording / reproducing apparatus according to an embodiment of the present invention.
(A), (b), (c) show the states in which the disc tray 3 is located at the disc mounting position, the disc ejecting position, and the intermediate position, respectively.

The disc tray 3 is provided with a reading hole 4 having a substantially elliptical shape in a substantially central portion of a rectangular plate and arranged along the longitudinal direction to set two kinds of discs having different sizes. Two types of disk mounting portions 7 and 8 are provided on the upper surface so as to be recessed. A disc (not shown) set on any of the disc mounting portions 7 and 8 rises from below the reading hole 4 through the reading hole 4 when positioned at the disc mounting position of FIG. The disc mounting portion lifts the disc tray 3 upward to rotate the disc tray 3, and a known pickup (not shown) moving along the reading hole 4 optically reads the recorded information of itself through the reading hole 4. Or the information is recorded. The disc tray 3 is slidably provided on the chassis 9 and can be mounted / dismounted at the disc mounting position where the disc reproducing operation or recording operation shown in FIG. It linearly reciprocates to and from the disc ejection position.

The chassis 9 is covered with a lid (not shown) to form a case, and the entrance (not shown) of the disc tray 3 is provided at the front end (lower end in FIG. 1) of the case. It is open. Therefore, the disc tray 3 is moved in the disc mounting direction A to be stored in the disc mounting position inside the case, and is also moved in the disc discharging direction B to pass through the opening and project to the disc discharging position outside the case. It is supposed to be done. The configuration described above is extremely well known, and therefore its illustration is omitted.

At a predetermined position near the front end of the chassis 9, a single contact type tray position detecting switch 2 similar to that used in the conventional mechanism shown in FIG. 5 is arranged. The side surface of the disc tray 3 facing the tray position detection switch 2 along the transport direction is arranged so that the contact actuator 2a of the tray position detection switch 2 can be pressed when the disc tray 3 is located at the disc mounting position and the disc ejection position. A pair of trigger protrusions 10 and 11 are provided in a protruding manner.

In the disk loading mechanism described above, since the pair of trigger projections 10 and 11 are provided in a wide space of the disk tray 3, which is a relatively large member, as described above, the conventional relatively small member is used. Compared with the case of forming a concavo-convex cam surface having a pair of protrusions 1a and 1b on a certain cam gear 1, it does not require much precision, and therefore processing is significantly easier. Furthermore, the disc tray 3 has the trigger protrusions 10 and 11 projecting at two positions facing the position where the tray position detection switch 2 is disposed when the disc tray 3 is moved to the disc mounting position and the disc ejecting position, respectively. Since it only has to be set, compared to the case where a concavo-convex cam surface is formed on the cam gear which converts the rotational movement of itself to linear movement and transmits it to the disc tray as in the conventional case, it does not require highly accurate setting and is inexpensive. Can be manufactured.

Further, at the time of assembly, since the tray position detecting switch 2 is directly positioned and arranged with respect to the disc tray 3 which is linearly moved, the relative position between the tray position detecting switch 2 and the disc tray 3 is simple and Can be positioned accurately. Moreover, since the tray position detection switch 2 is directly actuated by the pressing action of the pair of trigger projections 10 and 11 of the disc tray 3 which has moved to the disc loading position and the disc ejecting position, the tray position detecting switch 2 is turned on. The disc tray 3 can be accurately positioned because it is not turned on unless it is accurately moved to the disc mounting position and the disc ejecting position.

FIG. 2 is a block diagram showing the operation control system of the disc loading mechanism. The control unit 12 including a microcomputer controls the entire disc loading mechanism by executing a control program stored in the ROM based on various data stored in the RAM. That is, the control unit 12 commands the transport driving motor 14 to rotate in the forward direction or the reverse direction when the command signal by the operation of the tray operation switch 13 is input, and the transport driving motor 14 causes the disk to be rotated. The tray transport mechanism 17 is operated to move the disc tray 3 in the disc mounting direction A or the disc ejecting direction B, and the rotation of the transport driving motor 14 is stopped when a detection signal is input from the tray position detection switch 2. Then, the disc tray 3 is controlled to stop positioning. Further, the control unit 12 determines the position of the disc tray 3 when the power is turned on, and controls the memory 18 to store the determination result, which will be described in detail later.

The disc tray transport mechanism 17 decelerates the rotation of the transport driving motor 14 and then converts the rotation into a linear motion to the disc tray 3 for transmission. It has a well-known configuration including a pulley and a belt. However, in the above-described embodiment, since the position of the disc tray 3 is directly detected by the tray position detection switch 2, the disc tray transport mechanism 17 detects the position of the disc tray 3 as in the conventional mechanism shown in FIG. No means are provided. The tray operation switch 13 is similar to the EJECT / IN switch generally provided in the conventional mechanism,
The control section 12 simply turns on and off by pressing operation and releasing operation, and when the command signal by the on operation of the tray operation switch 13 is input, the control section 12 sets the disc tray 3 on the side opposite to the current position. It is controlled to move toward the position, which will be described in detail later.

The control processing by the control unit 12 in the disc loading mechanism will be described with reference to the flowchart of FIG. The controller 12 constantly monitors whether or not the power is turned on (step S1), and when it is determined that the power is turned on, the tray position detection switch 2
It is determined whether or not is on (step S2).
Here, when the tray position detection switch 2 is in the ON state, the disc tray 3 is positioned at either the disc mounting position or the disc ejecting position. Which is it immediately after the power is turned on? Cannot be determined. Therefore, the control unit 12 gives a command to the transport control motor 14 to rotate in the forward direction, for example, and controls the disk tray 3 to move toward the disc mounting direction (step S3). In this way, the control is performed so that the disc tray 3 is conveyed toward the disc mounting position, if the disc tray 3 is positioned in the disc mounting position and the power is turned on, the disc tray in the mounting position is turned on at the same time when the power is turned on. This is because, if 3 projects to the discharge position, the user will be surprised.

After controlling the disc tray 3 to move toward the mounting position as described above, the control unit 12 monitors whether or not the tray position detecting switch 2 has changed from the on state to the off state (step). S4). Here, when the tray position detection switch 2 changes from the ON state to the OFF state, the control unit 12 determines that the disc tray 3 positioned at the disc ejection position has started to move toward the disc mounting position, and the tray is detected. The conveyance drive motor 14 is controlled to continue to rotate in the forward direction until it is determined that the position detection switch 3 has been turned on again (step S5). Then, the controller 12 stops the rotation of the transport drive motor 14 at the time when the tray position detection switch 2 is turned on, positions the disc tray 3 at the disc mounting position, and then reads "the disc tray is at the disc mounting position. Existing tray position information is stored in the memory 18 of FIG. 2 (step S6).

On the other hand, the control unit 12 controls to move the disc tray 3 toward the disc mounting position (step S
3) After that, when it is determined that the tray position detection switch 2 is kept in the ON state for a certain period of time and the disc tray 3 is positioned at the disc mounting position (step S4), the drive motor 14 is driven. Is stopped (step S7), and the tray position information "the disc tray is at the disc mounting position" is stored in the memory 18 (step S6).

Further, when the controller 12 determines that the disc tray 3 is located between the mounting position and the ejecting position based on the tray position detecting switch 2 being in the off state after the power is turned on ( In step S2), the disc tray 3 is controlled to move toward the disc mounting position (step S9), and then the tray position detection switch 2 is turned on (step S9). When it is determined that the disc tray 3 is positioned at the disc mounting position by turning on, the driving of the transport drive motor 14 is stopped (step S10), and the tray position information "the disc tray is at the disc mounting position" is displayed. Is stored in the memory 18 (step S6).

After the power is turned on as described above, the position of the disc tray 3 is specified, and the tray position information "the disc tray exists at the disc mounting position" is stored in the memory 1.
8, the control unit 12 monitors that the tray operation switch 13 is turned on (step S11),
When it is determined that the tray operation switch 13 is turned on, the tray position information is read from the memory 18,
The transport drive motor 14 is drive-controlled to transport the disc tray 3 in the direction opposite to the position of the tray position information (step S12). In this case, since the disc tray 3 is positioned at the disc mounting position,
In order to convey the disc tray 3 toward the disc ejection position, the conveyance drive motor 14 is controlled to rotate in the reverse direction, for example.

After that, the control section 12 monitors that the tray position detection switch 2 is once turned off and then turned on again (step S13), and when the tray position detection switch 2 is turned on. Transport drive motor 1
Stop rotation of 4. At this time, the disc tray 3 is positioned and stopped at the disc unloading position. And
The control unit 12 updates the tray position information to "the disc tray exists at the disc ejection position" and stores it in the memory 18 (step S15). Subsequently, the control unit 12 determines until the power is cut off (step S16),
After returning to step S11, each time the tray operation switch 13 is turned on, steps S11 to S1 are performed.
By repeating the control process of 5, the disc tray 3
Is reciprocated between the disc mounting position and the disc ejecting position.

Therefore, if the position of the disc tray 3 is specified when the power is turned on, each time the tray operating switch 13 is operated thereafter, the tray position information in the memory 18 is read to set the carrying direction of the disc tray 3. Therefore, it is not necessary to refer to the history of voltage application to the transport drive motor 14 as in the conventional case.

In the above embodiment, the position detection switch 2
As an example, a case in which a single contact point that mechanically actuates similar to the conventional one is used is illustrated. However, as shown in FIG. 4, the light projecting section 20 and the light receiving section 21 are used for triggering the disc tray 3. Even if the tray position detection switch 19 that optically detects the protrusions 11 and 12 is used, the same effect as that described in the above embodiment can be obtained. Further, as shown by a chain double-dashed line, a reflection type optical element composed of a light emitting / receiving element can be used as a tray position detecting switch. By using such a tray position detecting element 19 that optically detects, the deterioration of the contact operation over time as in the case of the single contact type position detecting switch 2 does not occur, so that high reliability is ensured for a long period of time. be able to. In addition, in FIG. 4, a lid body 22 not shown in the above embodiment,
The entrance 23 of the disc tray 3 formed by the lid 22 and the chassis 9 is shown.

[0033]

As described above, according to the disc loading mechanism of the disc recording / reproducing apparatus of the present invention, since a pair of trigger projections are provided in a wide space of the disc tray which is a relatively large member, precision is improved. Since it does not require so much, it is remarkably easy to process. Furthermore, since the trigger for the disk tray may be provided at two predetermined positions along the transport direction, the disk tray can be easily processed as in the conventional case. In comparison with the case where the concave and convex cam surfaces are formed on the cam gear which converts the rotational movement of the above into linear movement and transmits it to the disc tray, it can be manufactured at low cost without requiring highly accurate setting. On the other hand, at the time of assembly, since the tray position detection switch is directly positioned and arranged with respect to the disc tray that moves linearly, the relative position between the tray position detection switch and the disc tray can be easily and accurately positioned. Moreover,
The tray position detection switch is not turned on unless the disc tray is accurately moved to the disc mounting position and the disc ejecting position, so that the disc tray can be accurately positioned.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of a disc loading mechanism of a disc recording / reproducing apparatus according to an embodiment of the present invention. FIGS. 1 (a), (b), and (c) are a disc mounting position and a disc, respectively. It is in a state of being located at the discharge position and the intermediate position.

FIG. 2 is a block configuration diagram of an operation control system of the above disc loading mechanism.

FIG. 3 is a flowchart showing a control process of the disc loading mechanism of the above.

FIG. 4 is a schematic longitudinal sectional view showing a schematic configuration of a disc loading mechanism of a disc recording / reproducing apparatus according to another embodiment of the present invention.

5A is a plan view of a cam gear provided in a disc loading mechanism of a conventional disc recording / reproducing apparatus, and FIGS. 5B to 5D show an operation of a tray position detection switch when the cam gear rotates. It is a side view shown.

[Explanation of symbols]

2,19 Tray position detection switch 3 disc tray 10, 11 Trigger protrusion (trigger part) 12 Control unit 14 Transport drive motor 17 Disc tray transport mechanism 18 memory A disk mounting direction B Disc ejection direction

Claims (3)

[Claims] 1. A transport drive motor capable of rotating in the normal and reverse directions, a disc tray on which a disc of a recording / reproducing medium is mounted and which is linearly movable between a disc loading position and a disc ejecting position, and the transport. A disc tray transport mechanism that converts the rotational power of the drive motor to the disc tray by converting it into linear motion and transmits it, and detects that the disc tray has been moved to the disc mounting position and the disc ejecting position, respectively. A single tray position detection switch that outputs a detection signal, and the rotation drive of the transport drive motor is stopped by the input of the detection signal from the tray position detection switch. The tray drive at that time is driven by driving the transport drive motor so that the tray is transported in either of the ejection directions. In a disc loading mechanism of a disc recording / reproducing apparatus including a control unit that specifies the position of the disc tray based on a change in the output of the detection switch, the tray position detection switch includes a proximity of the disc tray in the transport direction. A pair of trigger protrusions, which are detected by the tray position detection switch when located at the disc mounting position and the disc ejecting position, are arranged on the disc tray at positions along the transport direction. A disc loading mechanism for a disc recording / reproducing apparatus, wherein the control unit has a memory in which position information of the disc tray specified by the control unit when the power is turned on is stored by the control unit. 2. A disk as a recording / reproducing medium is mounted and linearly moved so that the disk is transported to a disk loading position and a disk ejecting position, and trigger portions are provided at two positions along the transportation direction. A disc tray, a disc tray transport mechanism for converting rotational power of a forward / reverse rotatable transport driving motor to the disc tray by converting the linear power into a linear motion, and transmitting the linear motion to the disc tray. A single tray position detection switch that detects the trigger portion and outputs a detection signal when moved to the ejection position, and a rotational drive of the transport drive motor by inputting a detection signal from the tray position detection switch. A disc loading mechanism for a disc recording / reproducing apparatus, comprising: a control unit for stopping. 3. The memory according to claim 2, further comprising a memory, wherein the control unit drives the transport drive motor to transport the disc tray in either a disc loading direction or a disc ejecting direction when power is turned on. The position of the disc tray is specified based on the output change of the tray position detection switch at that time and stored in the memory, and then the tray position is read from the memory each time a tray drive command signal is input from the tray operation switch. A disk for reading out information, transporting the disk tray to a position in the direction opposite to the tray position information, and then updating and storing the tray position information in the direction opposite to that at the time of reading from the memory in the memory. Disk loading mechanism for recording / playback devices.