JPH1040643A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk driving device rotating at high speed capable of preventing the trouble due to the opening of an upper cover. SOLUTION: The device is provided with a notched part 106a at the tip of a lock lever 10 and a DC motor 109 mounting a worm gear 109a at the tip of a driving shaft, and the worm gear 109a is engaged with an intermediate gear 108, and a rack 107a engaged with the intermediate gear 108 is formed on a stopper 107, then the notched part 106a is engaged with the stopper 107. A lock means of the lock lever 106 is formed by these arrangements, and when the number of rotation exceeds the specified number of rotation, the DC motor 109 is rotated in the direction where the stopper 107 is moved to the direction of the lock lever 106, then the notched part 106a at the tip of the lock lever 106 is engaged with the tip of the stopper 107 to interrupt the sliding of the lock lever 106 to the lock releasing direction (unlocking operation).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for retrieving and reproducing a CD-ROM as a large-capacity storage medium which has been attracting attention as a peripheral device of a computer.

[0002]

2. Description of the Related Art In recent years, CD-Rs have been used as large-capacity storage media.
Various information is provided by OM, and CD-R
The number of types in which a device for OM reproduction is incorporated in a computer body is increasing. On the other hand, portable external connection type CD-ROM devices have been developed to meet the demand for CD-ROM playback on notebook-type portable personal computers. These external connection type devices are connected to a notebook personal computer via a connection interface such as a PCMCI card. These externally-connected CD-ROM devices have also been marketed in a so-called portable form, with emphasis placed on portability due to the demand for portability of notebook personal computers. These CD-RO
The reproduction speed of the M apparatus is currently in the process of being increased, and has evolved from twice the conventional speed to four times and eight times faster. Here, taking a conventional portable type CD-ROM device as an example, the mechanism of the device will be described in detail with reference to an upper lid opening / closing mechanism.

FIG. 4 is a perspective view showing the appearance of a conventional CD-ROM device. FIG. 5 is a cross-sectional view showing an upper lid opening / closing detection switch unit for detecting the opening / closing of the upper lid 3 of the conventional CD-ROM device. FIG. 6 is a perspective view showing the inner surface of the upper cover 3 of a conventional CD-ROM device.

Here, reference numeral 1 denotes a pickup unit 15 for reading information recorded on a CD-ROM optically or a CD.
A turntable 14 for rotating the ROM at a constant linear speed;
And 2, an upper case having an operation switch group, a display and the like. Reference numeral 3 denotes an upper lid having a rear side fixed to the upper case 2 by a hinge shaft 4a provided on the shaft portion 4 so as to be freely opened and closed. A spring 5 is provided on the lower surface side of the upper lid 3 (the side that presses a CD-ROM (not shown) on the turntable 14), and the upper lid 3 is urged upward (in the opening direction).

Reference numeral 6 denotes a lock lever provided on the open end side of the upper lid 3 of the upper case 2 for preventing the upper lid 3 from being opened. 7
Is an open button plate having an elastic portion 7a which engages with the engaging portion 3a when the upper lid 3 is closed and prevents the upper lid 3 from being opened (opened by the spring 5). Reference numeral 8 denotes an open button which is positioned on the upper case 2 and is pressed downward to release the engagement between the elastic portion 7a and the engaging portion 3a and open the upper cover 3. Here, as shown in FIG. 4B, by manually sliding the lock lever 6 in the direction of the arrow, the operation of the open button 8 (pressing downward).
(Lock position) and a position enabling operation. 9 is a screw for fixing the open button plate 7 to the upper case 2. Upper case 2
An upper lid open / closed detection switch 11 is provided at a position facing the edge of the upper lid 3. The upper lid open / closed detection switch 11 includes a spring member 10 and a micro switch 12 mounted on a main board. The upper lid opening / closing detection switch 11 is pressed downward by the upper lid 3 when the upper lid 3 is closed, and the micro switch 12 is in an ON state. 13
Is a pickup module. 14 is a turntable for chucking the disk, and 15 is a pickup unit for reading the disk.

FIG. 7 shows a top cover 3 of a conventional CD-ROM device.
5 is a flowchart of the opening and closing operation of the embodiment. FIG. 8 shows a conventional C
FIG. 2 is a block diagram illustrating a hardware configuration of the D-ROM device.
A disk control circuit 16 controls the drive unit 17 and controls the rotation of the disk. The drive unit 17 includes a spindle motor 18 for driving the turntable 14 to rotate. Reference numeral 19 denotes a ROM serving as storage means for storing a control program for the entire CD-ROM device, such as for driving a disk at a constant linear velocity. Reference numeral 20 denotes a CPU as central control means for controlling the entire apparatus, 21 denotes a gate array, and 22 denotes a SCSI interface for connecting an external computer or the like to the apparatus.

Next, the operation when the upper cover 3 is opened during the CD-ROM reproducing operation will be described. When the open button 8 is pressed, the engagement between the elastic portion 7a and the projection 3a is released, and the upper lid 3 starts opening upward by the repulsive force of the spring 5. At the same time as the upper lid 3 is opened, the upper lid opening / closing detection switch 11 is slid upward by the spring member 10, the micro switch 12 is operated, and it is detected that the upper lid 3 is opened (ON).
From the state to the OFF state).

When the upper lid 3 is detected to be open, a signal indicating that the upper lid 3 has been opened detected by the upper lid open / close detection switch 11 is input to the CPU 20 as shown in the block diagram of FIG. . When detecting that the upper lid 3 is opened, the CPU 20 reads the program written in the ROM 19 and issues an instruction to the disk control circuit 16 to issue a signal for stopping the rotation drive of the disk. The disk control circuit 16 controls the drive unit 17 to stop the spindle motor 18 which is a part of the drive unit 17, and stops the rotation of the disk.

[0009]

SUMMARY OF THE INVENTION Conventionally, the aforementioned CD-
Like a ROM device, a manual lock lever 6 is provided to prevent an inadvertent opening / closing operation (open button 8) of the top cover 3 during rotation driving (during a reproducing operation) of the disk. In addition, an upper lid open / close detection switch 11 is provided to cope with an inadvertent opening / closing of the upper lid 3 due to forgetting to lock the lock lever 6, so that when the upper lid 3 is opened while the disk is rotating, the rotation of the disk is stopped immediately. Have been. When the rotational speed of the disk is low (2x / 4x) as in the case of the conventional CD-ROM device, the rotation of the disk is low and the emergency stop can be performed when the top cover 3 is opened. However, when the rotation speed (reproduction speed) of the disk is higher than 6 times speed, there is a problem that even if the brake is applied for an emergency stop or the like when the upper lid is opened, it does not stop immediately, and the stop operation cannot be performed in time. There was fear.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an upper lid which is openably and closably fixed to a main body with one side as a support shaft so as to cover a rotating surface of a disk mounted on the main body, A CD-ROM device comprising: a spring for urging an upper lid upward on a side opposite to a support shaft; an open button for opening the upper lid; and a lock lever for preventing opening and closing of the upper lid by the open button. Number of rotations detecting means for detecting the number of rotations, a number of rotations storage means for storing a preset number of rotations, and the number of rotations detected by the number of rotations detecting means and a predetermined number of rotations stored in the storage means The number of revolutions comparing means to be compared, the locking means for preventing the lock lever from being released, and the number of revolutions of the disc detected by the number of revolutions detecting means are set to a predetermined number of revolutions (2,000 in this embodiment). If it exceeds the speed, it is equipped with a control means that activates the lock means. With this configuration, it is possible to prevent a trouble in inadvertent opening of the lid due to forgetting to lock the lock lever etc. A rotating disk drive can be provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is directed to an upper lid which is rotatably secured to the main body with one side as a support shaft so as to cover a rotating surface of a disk mounted on the main body, Provided with a spring that urges the upper end of the upper cover on the side opposite to the support shaft, an open button that opens the upper cover, and a lock lever that prevents opening and closing of the upper cover by the open button.
A D-ROM device, comprising: a rotation number detecting means for detecting a disk rotation number; a rotation number storing means for storing a preset rotation number; and a rotation number detected by the rotation number detecting means and stored in a storage means. Rotation speed comparing means for comparing a predetermined rotation speed (for example, 2,000 rpm in the present embodiment), locking means for preventing release of the lock lever, and a disk detected by the rotation speed detecting means. When the number of rotations exceeds a predetermined number of rotations, control means for operating the locking means is provided, whereby even if the user has locked the lock lever, A predetermined rotation speed (2,000 rpm in the case of the present embodiment) of the rotation speed (reproduction speed) of the disk
Set forth in In this case, even if the upper lid is opened, even if the upper lid is opened, the brake mechanism safely stops the lock), the lock lever is locked by the locking means, so that the careless opening and closing of the upper lid can be avoided. Have.

According to a second aspect of the present invention, in the first aspect of the present invention, the locking means comprises a DC
A motor, a plurality of rows of intermediate gears that are decelerated by a worm gear provided on the DC motor shaft, and a rack connected to the intermediate gear and having a lever at a tip,
When the DC motor rotates in one direction, the rack interferes with the holes or projections provided on the lock lever to prevent the opening and closing of the top cover by the open button, and the DC motor rotates in the opposite direction, causing the meshing. When released, the upper lid can be opened and closed, which has an effect that the lock mechanism can be configured with a simple configuration.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a perspective view showing the inner surface of the upper lid according to one embodiment of the present invention. Here, the same reference numerals are given to members equivalent to those in the conventional example, and the description is omitted. Note that the external view of the CD-ROM device according to the embodiment of the present invention is similar to that shown in the conventional example, so that the drawings are omitted, and only detailed views showing differences and features are shown.

In FIG. 1, reference numeral 106 denotes a lock lever for preventing the opening / closing operation of the upper cover 3 by the open button 8;
As shown in FIG. 1, the operation of the open button 8 is regulated by sliding in the direction of the arrow. Reference numeral 106a denotes a notch provided at the tip of the lock lever 106. 10
7 is a stopper, 108 is an intermediate gear, and 109 is a D in which a worm gear 109a is attached to the tip of the drive shaft.
It is a C motor. Worm gear 109a is intermediate gear 1
The stopper 107 is formed with a rack 107a that meshes with the intermediate gear 108. The stopper 107, the intermediate gear 108, and the DC motor 109 constitute a lock means of the lock lever 106.

FIG. 2 is a block diagram showing a hardware configuration according to an embodiment of the present invention. Reference numeral 110 denotes a disk control circuit that controls the drive unit 111 and controls rotation of the disk. The drive unit 111 includes a spindle motor 112 for driving the turntable 14 to rotate. Reference numeral 113 stores a control program for the entire CD-ROM device, such as driving the disk at a constant linear velocity, and a predetermined number of rotations of the disk (for example, even if the upper cover 3 is opened when the disk rotates, the disk is not loaded). ROM as storage means for storing the number of rotations that do not jump out. 114 is a CPU as central control means for controlling the entire apparatus, and 115 is a D
A lock driver that controls the C motor 109 controls whether or not to activate the lock unit based on the comparison result of the rotation speed comparison unit. 116 is a gate array,
117 is a SCSI that connects the device with an external computer or the like.
Interface. Here, the rotation number detecting means for detecting the rotation number of the disk is included in the drive unit 111, and the rotation number detected by the rotation number detecting means and the predetermined rotation number stored in the storage means are determined. Is included in the disk control circuit.

The operation of the CD-ROM device having the above-described structure in opening and closing the upper cover will be described with reference to the flowchart shown in FIG.

First, a CD-ROM disc is mounted on the turntable 14, and with the top cover 3 closed, a play start switch (not shown) of the apparatus main body is operated to operate C.
A play start command is issued to the PU 114. At this time, the upper cover opening / closing detection switch 11 is in the ON state, and the CPU 114 has grasped that the upper cover 3 is securely closed. In response to the play start command, the CPU 114 issues a command to the disc control circuit 110 to operate the drive unit 111, and drives the spindle motor 112 to rotate the disc. Here, the rotation speed of the spindle motor 112 is periodically detected by the rotation speed detection means in the drive unit 111, and the detected rotation speed is determined by the predetermined rotation speed stored in the ROM 113 by the rotation speed comparison means. Is performed (step 1). Next, when the rotation speed exceeds a predetermined rotation speed as a result of this calculation, the DC motor 109 rotates in a direction in which the stopper 107 moves toward the lock lever 106 (step 2). Thereby, the stopper 107
Notch 106 at the end of the lock lever 106
The engagement of the lock lever 106 prevents the lock lever 106 from sliding in the unlocking direction (unlocking operation) (step 3). Therefore, the operation of the open button 8 is completely prevented (step 4).

If the rotation speed of the spindle motor 112 has not reached the predetermined rotation speed in step 1, the DC motor 109 rotates so that the stopper 107 slides in the direction opposite to the lock lever (step 5). Thereby, the notch 1 of the lock lever 106
The engagement of the stopper 06a with the stopper 107 is released (step 6), the lock lever 106 can be released, and the open button 8 can be operated (step 7). Step 7 after the upper lid 3 is opened is the same as the conventional operation, and thus the description thereof will not be repeated.

In the present embodiment, the locking means is constituted by a worm gear, a rack or the like. However, the locking means is reduced by a DC motor, a pinion provided on the DC motor shaft, and a pinion. A plurality of rows of gears, a rack connected to the gears and having a lever at the tip, a pin-shaped projection provided at a fixed distance from the rotation center of the last stage gear, and engaged with the pin-shaped projection to convert the motion into linear motion. It is obvious to those skilled in the art that the configuration can be made by using the lock lever even if it is not shown again, and it is obvious that the same operation and effect can be obtained.

[0020]

As described above, according to the present invention, it is determined that the number of rotations of the disk is equal to or more than the specified rotation based on the signal from the disk, and the lock driver of the upper lid is driven. Even if the lock is overwhelmed, if the rotation speed (reproduction speed) of the disk exceeds a certain predetermined speed (a speed at which the disk is likely to fly out if the upper lid is opened), the locking means is used. Since the lock lever is locked, an inadvertent opening / closing operation of the upper cover can be avoided, and the safety is excellent, and an excellent CD-R that automatically operates the lock mechanism.
An OM device is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an inner surface of an upper lid according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a hardware configuration according to the embodiment of the present invention;

FIG. 3 is a flowchart of an opening / closing operation of an upper cover according to the embodiment of the present invention;

FIG. 4 is an external view showing the external appearance of a conventional CD-ROM device.

FIG. 5 is a cross-sectional view showing an upper lid opening / closing detection switch unit for detecting the opening / closing of the upper lid of a conventional CD-ROM device.

FIG. 6 is a perspective view showing an inner surface of a top cover of a conventional CD-ROM device.

FIG. 7 is a flowchart of an opening / closing operation of a top cover of a conventional CD-ROM device.

FIG. 8 is a block diagram showing a hardware configuration of a conventional CD-ROM device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower case 2 Upper case 3 Upper lid 4 Shaft 5 Spring 6 Lock lever 7 Open button plate 8 Open button 9 Screw 10 Spring member 11 Upper lid open / close detection switch 12 Micro switch 13 Pickup module 14 Turntable 15 Pickup unit 106 Lock lever 106a Cut off Notch 107 Stopper 107a Rack 108 Intermediate gear 109 DC motor

Claims (3)

[Claims] An upper lid fixed to the main body so as to be openable and closable with one side as a support shaft so as to cover a rotating surface of a disk mounted on the main body, and the upper lid is urged upward on a side opposite to the support shaft; A CD-ROM device comprising a spring, an open button for opening the upper cover, and a lock lever for preventing the upper cover from being opened and closed by the open button, wherein a rotation speed detecting means for detecting a rotation speed of the disk; A rotation number storage unit that stores a preset rotation number, a rotation number comparison unit that compares the rotation number detected by the rotation number detection unit with a predetermined rotation number stored in the storage unit, A locking means for preventing the release of the lock lever; and a control means for operating the locking means when the rotation speed of the disk detected by the rotation speed detection device exceeds a predetermined rotation speed. Disk drive apparatus characterized by comprising and. 2. The apparatus according to claim 1, wherein the predetermined number of revolutions is set between 1800 (rpm) and 2400 (rpm) according to a holding force when the disc is mounted. Disk drive. 3. The lock means comprises a DC motor, a DC motor,
It comprises a plurality of rows of intermediate gears decelerated by a worm gear provided on a motor shaft, and a rack connected to the intermediate gear and having a lever at a tip. When the DC motor rotates in one direction, the rack locks the lock. The opening and closing of the upper lid by the open button is prevented by interfering with the hole or projection provided on the lever, and the opening and closing of the upper lid is enabled by the DC motor rotating in the opposite direction and the engagement being released. 2. The disk drive according to claim 1, wherein: