JPH06342569A - Locking mechanism of pickup carrier - Google Patents

Abstract

PURPOSE:To form a locking mechanism of pickup carrier capable of performing the locking operation at the time of a transporting lock or an emergency eject and also capable of making small and thin in size and light in weight which are the required specifications for the device. CONSTITUTION:A loading pin 52A formed on a loading slide 52 for loading is inserted through a hole 12d which is bored and formed on a lock arm 12 of the locking mechanism part. The lock arm 12 is rotated around a rotary shaft 14 by a energizing force of a twist coil spring 18 in accordance with the abutting position of the loading pin 52A on the side surface 12e of the hole 12d, then an arm pawl 12A and an engaging part 33B of a movable pickup part 33 are interlocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup carrier lock mechanism for preventing movement of a movable pickup portion provided in a disk device.

[0002]

2. Description of the Related Art Recently, a data recording / reproducing apparatus has become capable of storing a large amount of data, for example, on the order of gigabytes, and while the speed of processing such as data transfer is being advanced, these specifications are satisfied. Miniaturization that conflicts with the conditions,
It is strongly desired that the device be made thinner and supplied as an inexpensive device on the market.

An optical disk device is an example of a data recording / reproducing device that satisfies such requirements. The optical disk device includes an optical unit section including a light source such as a semiconductor laser that emits a light beam irradiated onto the optical disk and a light receiving section such as a photodetector that receives the light beam that is the return light reflected from the optical disk, and It has an objective lens for condensing a light beam emitted from a light source on the disk surface, and an objective lens section having a lens drive mechanism for driving and displacing the objective lens at least in the optical axis direction of the objective lens.

Conventionally, an optical disc apparatus reads an information signal recorded on the optical disc by moving the entire pickup unit, which is integrally formed with the optical unit and the objective lens, in the radial direction of the optical disc, or reads the information signal on the optical disc. A predetermined information signal is recorded. Since the pickup section is integrally formed, it is necessary to move the entire pickup section. This moving operation not only increases the moving space in the optical disk device, but also increases the size of the pickup driving mechanism. As a result, it is difficult to reduce the size and weight of the entire device.

As a method for solving this problem, in an optical disk device, the above-mentioned pick-up part is made independent of an optical unit part and a movable pick-up part including an objective lens part, and the optical unit part is disposed in the main body of the device. There is an optical disk device that is fixedly arranged on the main chassis and has the movable pickup unit supported on the main chassis so as to be movable in the radial direction of the optical disk.

When the pickup unit having the above-described structure is separated into an optical unit section and a movable pickup section, the optical disk device must have an entrance / exit section for entering and exiting a light beam in the optical unit section and the movable pickup section, respectively. I won't. In other words, the pickup section having an integral structure is a portion where only the objective lens is exposed to the outside, but the pickup section having the above-described separated and independent structure is not only for the objective lens but also for the input / output section of each light beam. Will be faced with.

When dust or the like adheres to the light beam entrance / exit portion, the light beam is diffusely reflected by the dust or the like, and the transmission amount of the light beam transmitted through the optical unit portion and the movable pickup portion is attenuated. As a result, not only the signal recording area of the optical disk cannot be irradiated with a sufficient light beam, but also the return light reflected from the optical disk is attenuated. As a result, the waveform of the read signal detected by the light receiving unit is broken, and the information signal having good reproduction characteristics cannot be reproduced.

Further, since the amount of transmitted light passing through each part of the pickup part is attenuated, the power of the light beam applied to the signal recording area of the optical disk becomes insufficient, resulting in a defective writing of the information signal.

In order to prevent the attenuation of the amount of light due to dust or the like entering or exiting the light beam, the optical disk device is
When the disc cassette is loaded or ejected, the movable pickup unit is moved to the optical unit side to close the light beam entrance / exit unit, and the power supply is turned off when the disc cassette is unloaded, that is, when the disc cassette is unloaded. A lock mechanism for holding the closed state of the entrance / exit portion is provided without using the lock mechanism.

[0010]

By the way, in the above-mentioned pickup section, the movable pickup section is provided on the side of the optical unit section in response to loading the disk cassette into the apparatus or unloading the disk cassette from the apparatus. It is possible to close the entrance / exit of the light beam.

However, when the optical disk device is transported,
Since disturbances such as vibrations are much larger than in the case where the power source is simply turned off and the apparatus is left stationary, there is a risk that the movable pickup and the like will be destroyed by the disturbances. In general,
When the optical disc device is transported, a transport lock is applied to prevent the movable pickup unit from moving. As a method of this transportation lock, a method of arranging a lock mechanism inside a magnetic circuit composed of a linear motor for moving a movable pickup portion in an optical disk device is often used. When the user unlocks the transportation lock after unpacking at the destination, many steps are required, such as the step of removing the outer casing of the device to unlock the transportation lock and the step of unlocking the transportation lock arranged inside. . This work is a complicated work for the user and the service person.

Further, this transportation lock method is not suitable for the above-mentioned demand for thinning of the device by disposing, for example, the lock members so as to overlap each other in the height direction of the magnetic circuit or the like. It is also apparent that the lock member is not suitable for size reduction and weight reduction because it is composed of a plurality of sawtooth members.

In addition to the above-described lock during normal operation, the loaded disk cartridge may be ejected urgently. At the time of this emergency eject, by using a complicated mechanism for separating and independently separating the optical unit section and the movable pickup section, it is possible to interlock the movable pickup section with a locking operation for preventing movement. very hard.

As described above, the optical disc device has required specifications for the device due to various problems in performing, for example, a transportation lock or a locking operation in an emergency eject other than a normal operation including an inoperative state when the device is stationary. That is, it is impossible to reduce the size, the thickness, and the weight.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and enables a lock operation in a transportation lock or an emergency eject, and is a required size reduction, thinning, and light weight of the apparatus. An object of the present invention is to provide a pickup carrier lock mechanism that can be realized.

[0016]

A pickup carrier lock mechanism according to the present invention is a pickup carrier lock mechanism for preventing movement of a movable movable pickup portion supported on a chassis, which is a loading mechanism portion for a disc cartridge. The loading slide member, the lock arm member that displaces the lock arm member in the horizontal plane of the main chassis according to the movement of the slide member, and prevents the movable pickup unit from moving, and the lock mechanism portion described above. And a biasing means for biasing the lock arm member in the lock position direction, and the movable pickup portion is locked at a position on the outermost periphery of the disc contained in the disc cartridge, thereby solving the above-mentioned problems. .

Here, the lock mechanism section is provided outside a coil bobbin arranged in a linear driving means for linearly driving the movable pickup section, a claw member is arranged in the lock arm member, and the claw member is moved. Is provided on the side that is in sliding contact with the locked object. Further, a cutout portion is provided in the yoke portion of the linear drive means for linearly driving the movable pickup portion, and the claw portion of the lock arm member is arranged in the cutout portion.

The slide member is slidably mounted on the main chassis and is slidable in a direction orthogonal to the reciprocating direction between the insertion position and the mounting position of the disk cartridge in accordance with the operation of the loading motor. It slides in the reciprocating direction via a connector.

[0019]

In the pickup carrier lock mechanism according to the present invention, the slide member of the loading mechanism section is operated to reciprocate the disk cartridge, and the lock arm member is displaced in the horizontal plane of the main chassis to lock the lock mechanism section. When the disk cartridge is moved from the unlocked side attached to the arm member to the locked side, the unlocked side is guided by the claw portion having an inclined surface, and the movable side is picked up by the surface of the claw portion on the locked side. The lock position is fixed by the urging means by engaging the parts.

Further, the yoke portion of the linear driving means for moving the movable pickup portion is provided with a cutout portion, and the claw portion of the lock arm member is arranged in the cutout portion to improve space use efficiency.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pickup carrier lock mechanism according to the present invention will be described below with reference to the drawings. In this embodiment, the pickup carrier lock mechanism portion when the pickup carrier lock mechanism is applied to a 5.25-inch magneto-optical disk drive device will be described. The target to be locked by the pickup carrier lock mechanism unit is the movable pickup unit of the separation optical system.

1 to 4 are schematic views of the pickup carrier lock mechanism portion in this embodiment, as viewed from respective directions. Here, in FIG.
It is the top view which looked at the pickup carrier lock mechanism part from the upper surface side. FIG. 2 is a front view of the pickup carrier lock mechanism section as seen from the direction of arrow A. Also, FIG.
FIG. 4 is a side view of the pickup carrier lock mechanism portion viewed from the direction of arrow B, and FIG. 4 is a plan view of the pickup carrier lock mechanism portion viewed from below.

The pickup carrier lock mechanism is formed by forming a loading slide 52, which is a slide member for loading, which will be described later, and the lock arm 12, the rotary shaft 14, and the lock arm 12 as members of the lock mechanism. A lock mechanism portion having a hole 12d and a torsion coil spring 18 as a biasing means are used. In this pickup carrier lock mechanism portion, a loading pin 52A formed on a loading slide 52 for loading is inserted into a hole 12d formed in the lock arm 12 of the lock mechanism portion, and the loading pin 52A is formed on the side surface 12e of the hole 12d. Depending on the contact position, the lock arm 12 is rotated about the rotation shaft 14 by the biasing force of the coil spring 18, and the arm claw 12A and the movable pickup unit 3 are rotated.
It is used as a lock mechanism that locks the third engaging portion 33B. .

In the pickup carrier lock mechanism portion, the lock base 11 is used as a cover for rotating the lock arm 12 in a plane parallel to the plane of the main chassis, for example. The lock base 11 is provided with two mounting portions 13, 13 for disposing the pickup carrier lock mechanism portion in another device. Further, the lock base 11 has mounting portions 13 and 13 having a gap (see FIGS. 1 and 2) from the end surface 11a of the lock base 11 in order to provide a rotation space for the lock arm 12.
The mounting portions 13 and 13 have holes 1 for mounting screws, respectively.
3a and 13b are drilled. This lock base 11
The rotary shaft 14 is caulked and provided through the hole that has been drilled. The rotating shaft 14 is the lock arm 1 described above.
The rotary shaft 14 is arranged in a direction perpendicular to the rotating plane, and one end of the rotary shaft 14 is fixed to the lock base 11. Further, the lock arm 12 is also provided with a hole through which the rotary shaft 14 penetrates.

The lock base 11 forms a stopper portion 15 for stopping the rotation of the lock arm 12. The stopper portion 15 is formed by bending a portion of the lock base 11 that is cut out in three directions in the same direction as the rotating shaft 14. Further, the lock base 11 has an "L" -shaped end portion 1 with the mounting portion 13 of the lock base 11 as one end side.
6 is also bent at a right angle. The end portion 16 is formed with a U-shaped cutout portion 16a for retaining one end of a torsion coil spring 18 penetrating the rotating shaft 14 as described later (see FIG. 2). ).

In order to bring the lock arm 12 into the locked state, the pickup carrier lock mechanism section uses the torsion coil spring 18. In the pickup carrier lock mechanism portion, as is apparent from FIG. 3, the rotating shaft 14 fixed to the lock base 11 passes through the lock arm 12 and the torsion coil spring 18 sequentially from the other end side which is not fixed. The pick-up carrier lock mechanism is composed of a rotary shaft 1.
In order to prevent each member from coming off after passing through No. 4, it is fixed with a poly washer 19. As described above, the torsion coil spring 18 urges the one end side 18 a in the direction of the arrow B to cut the cutout portion 1.
It is in contact with 6a. The other end 18b of the torsion coil spring 18 is bent so as to correspond to the shape of the lock arm 12. One end 20 of the lock base 11 is folded back so that the long other end 18b does not fall.
The other end 18b of the torsion coil spring 18 is inserted and sandwiched between the folded end 20 and the arm base 11.

Further, the twisted coil spring 18 is sandwiched.
Urges the protrusion 12a formed on the lock arm 12 in the direction of arrow C. The biasing force of the torsion coil spring 18 causes the lock arm 12 to rotate about the rotation shaft 14 in the arrow D direction. This rotation continues until the stopper 15 and the lock arm 12 come into contact with each other.

Here, the pickup carrier lock mechanism portion is the other end side 12b of the lock arm 12 shown in FIG.
The arm claws 12A are provided on, for example, an adhesive. The engaging surface 12B of the arm claw 12A is, for example, a dogleg-shaped inclined surface. By bonding the arm claw 12A to the lock arm 12, the end 12b side of the lock arm 12 is thickened by the thickness of the arm claw 12A.

Even if the arm claws 12A are thick, the lock arm 12 can freely rotate, so that the arm base 1
1 is provided with a cutout portion 12c in consideration of a movement locus of the arm claw 12A due to the rotation of the lock arm 12. When the lock arm 12 reaches the position of the stopper portion 15 in this way, for example, the movable pickup as a locked object is
It is completely engaged and locked by the arm claw 12A.

Further, the lock arm 12 is provided with a hole 12d as shown in FIG. In this hole 12d, for example, a protrusion provided on the slide member is arranged. The protrusion abuts on the side surface 12e of the hole 12d formed by the slide of the slide member, and the slide member slides to press the lock arm 12. This slide causes the lock arm 12 to rotate in the direction opposite to the arrow D direction in which the biasing force acts. By rotating in this direction, the arm claw 12A is released from the engaged state with the locked object, that is, the lock is released.

With this configuration, for example, the movable pickup section of the separation optical system can be locked.

A case where the pickup carrier lock mechanism is mounted in the magneto-optical disk device will be described with reference to FIGS. Here, common parts are given the same reference numerals, and description thereof is omitted.

[Outline Description of Entire Disk Device] First, an overview of the entire disk device will be described with reference to FIGS. FIG. 5 is an external perspective view showing a schematic configuration on the back surface side inside the magneto-optical disk device. A disk table 32 driven to rotate by a spindle motor 31 (see FIG. 6) along a chassis center P _{2 of} a horizontal main chassis 30 formed by aluminum die casting shown in FIG. 5 and a voice coil motor 33. An optical pickup 34 that is linearly moved is mounted side by side in the front and rear direction in the directions of arrows b and b '. In addition,
These spindle motor 31 and voice coil motor 3
3 is supported by a sub chassis 35 mounted horizontally on the main chassis 30.

The loading motor 36 and the eject lever are provided at a part of the rear end 30b side of the main chassis 30 opposite to the front panel (not shown) arranged in the magneto-optical disk device shown in FIGS. 5, 6 and 7. (Not shown) are mounted on top of each other.

As shown in FIGS. 5, 6 and 7, a main slider 37 formed of sheet metal or the like on the main chassis 30.
Is slidably attached. The main slider 37 includes a horizontal plate 37a having a substantially U-shaped planar shape, and a pair of parallel left and right side plates 37b vertically rising from both left and right edges of the horizontal plate 37a.
It is formed by and. This main slider 37
Engage with four cartridge positioning pins 38 also serving as guide shafts mounted on the main chassis 30 through four elongated holes 39 formed in the horizontal plate 37a. The main slider 37 is the main chassis 3 shown in FIG.
It is configured to freely slide in the directions of arrows b and b'between the backward moving position P ₃ of the front end 30a of 0 and the forward moving position P ₄ of the rear end 30b of the main chassis 30 shown in FIG. There is.

Between the left and right sides of the horizontal plate 37a of the main slider 37 and the main chassis 30, tension springs 40 are arranged as a pair of left and right urging means for backward movement. By this tension spring 40, the main slider 37 is urged back to the return position P _{3 in the} direction of arrow b ′. The horizontal plate 37a, which is biased in the returning direction, comes into contact with the slider stopper 41 fixed to the main chassis 30 and stops.

A cartridge holder (not shown) is horizontally arranged above the main slider 30 between the left and right side plates 37b of the main slider 30. Like the main slider 30, this cartridge holder is also made of sheet metal or the like. This cartridge holder is provided with guide pins in the directions of arrows b and b ′ in FIG. The guide pins are loosely fitted in a total of four inclined guide grooves 42 formed in the front and rear ends of the left and right side plates 37b of the main slider 37 shown in FIG. These slant guide grooves 42 are slanted at a predetermined slanting angle that rises obliquely upward in the direction of arrow b. In addition, the upper and lower end portions 42a, 4
2b is formed to be bent horizontally. By thus configured and moving the main slider 37 in the directions of the arrows b and b ′, the entire cartridge holder can be moved up and down along the groove of the inclined guide groove 42.

In this magneto-optical disc apparatus, a magnetic head raising / lowering mechanism for integrally raising / lowering the magnetic field head and the disc clamper is attached to a substantially central portion of the top plate of the cartridge holder.

Next, an outline of the loading mechanism and the ejecting mechanism of the disc cartridge and the operation thereof in the magneto-optical disc device based on the above configuration will be described.

[Explanation of Loading Mechanism] The loading mechanism 50 uses the loading motor 36 to move the main slider 37 between the backward movement position P ₃ shown in FIG. 6 and the forward movement position P ₄ shown in FIG. This is a mechanism for reciprocating in the b'direction. This loading mechanism 50 is a loading slider 52 which is a main slider driving means for slidingly driving the main slider 37 shown in FIGS. 6 and 7 in the directions of arrows b and b ′ through a conversion link 51, and a loading slider shown in FIG. Motor 36 and loading slider 5
A loading intermediate slider 53 which is an intermediate driving means for connecting the two, an eject pin lever 55 having an eject pin 54 for auto eject, manual eject sliders 56 and 57 for manual eject, and a loading slider 52. It is configured by using a connector 59 or the like having a leaf spring 58 that detachably connects the loading intermediate slider 53. Here, the conversion link 51, the loading slider 52, the loading intermediate slider 53, the eject pin lever 55, and the manual eject sliders 56 and 57 described above.
Is formed of sheet metal or the like.

As shown in FIG. 7, the front and rear ends 30 of the main chassis 30 are provided on one side of the upper surface of the main chassis 30.
A groove portion 60 is formed between a and 30b in the front-rear direction indicated by arrows b and b '. The loading mechanism 50
Are horizontally accommodated in the groove-shaped portion 60 along the front-back direction. The main slider 37 is mounted on the main chassis 30 so as to straddle the loading mechanism 50. The main slider 37 is mounted on the main chassis 30 so as to be slidable in the directions of arrows b and b ′.

At this time, as shown in FIG. 8, the loading mechanism 50 housed in the groove 60 has a manual eject slider 56, a loading slider 52, a loading intermediate slider 53, and a manual eject slider 57 in order from the top. They are stacked and stored. Each slider has a slot 62 for each member.
Are formed by drilling. A pair of front and rear guide pins 61 mounted in the groove portion 60 are inserted into the elongated holes 62 and engaged with the respective sliders. In response to this engagement, the slider is free to slide in the directions of arrows b and b '.

The loading slider 52 has a front end wide portion 52a integrally formed on the front end side of the main chassis 30 on the front panel side. A conversion link 51 rotatably mounted in a seesaw shape on the main chassis 30 shown in FIGS. 6 and 7 via a fulcrum pin 63.
Is a long hole 6 provided at both ends of the conversion link 51 at the inner end of the wide portion 52a of the loading slider 52 and the center portion of the horizontal plate 37a of the main slider 37 in the horizontal direction.
Pins 64 and 66 are inserted through 5 and 67, respectively.
With this structure, the conversion link 51 is interlocked with the movement of the slider (see FIGS. 6 and 7).

As a result, a connecting pin 68 fixed vertically to the lower surface of the front end of the loading intermediate slider 53 shown in FIG. 8 is formed at the front end of the wide portion 52a of the loading slider 52. Also, the loading slider 52
Has a notch 69 formed in a U shape in the front (in the direction of arrow b ′ in FIG. 5). This loading slider 52
Has a loading pin 52A projecting vertically from the lower surface of the loading slider 52, which is slightly rearward of the center of the longitudinal length of the loading slider 52. The connecting pin 68 is fitted into the notch 69 from above. On the other hand, the loading intermediate slider 53 has a long hole 70 formed at the rear end side thereof in a direction perpendicular to the front-rear direction indicated by the arrows b and b ′. A crank pin 71 with a roller for converting the rotational movement of the loading motor 36 into a linear movement is provided in the elongated hole 7
It is loosely fitted in 0, and further penetrates through the elongated hole 70 and projects upward (see FIGS. 6 and 7). The crank pin 71 is vertically integrally formed on the eccentric position of the circular rotary plate 71A.

Next, the loading intermediate slider 53 is
A fulcrum pin 72 is fixedly formed perpendicularly to the front side of the position where the elongated hole 70 is formed on the rear end side upper part. The fulcrum pin 72 is
The eject pin lever 55 shown in FIG. 8 is fitted in a hole formed in the front end side of the eject pin lever 55. The eject pin lever 55 freely rotates about the fulcrum pin 72 in the directions of arrows k and k ′, respectively. In addition, the eject pin lever 55 includes a fulcrum pin 72 on the arrow b side,
That is, the elongated hole 73 is provided on the rear side of the eject pin lever 55.
Is formed. The long hole 73 is formed at a position intersecting the upper portion of the long hole 70 formed in the loading intermediate slider 53. By disposing such an eject pin lever 55, the upper end of the crank pin 71 is loosely fitted in the elongated hole 73. Further, the eject pin lever 55 is the eject pin lever 5
The eject pin 54 with a roller is vertically attached to the upper surface of the rear end side of the No. 5 and outside the elongated hole 73.

A protruding piece 56a vertically bent downward from the front end of the manual eject slider 56 is inserted from above into a cutout portion 74 formed side by side with a cutout portion 69 formed in the wide width portion 52a of the loading slider 52.
Further, a projecting piece 57 a vertically rising upward from the manual eject slider 57 penetrates an elongated hole 75 formed at the rear end side of the loading intermediate slider 53 and projects upward. Further, the manual eject protrusion 76 is formed by vertically projecting upward from a step formed on the outer end on the rear end side of the manual eject slider 57.
The eject pin 54 is arranged near the outside of the eject pin 54.

Next, the coupler 59 will be described with reference to FIGS. The leaf spring 58 of the coupler 59 is formed in a substantially rectangular shape, and has a rectangular opening 7 at the center.
7 are formed. The rear end 58a side of the leaf spring 58 is fixed to the lower surface of the wide portion 52a of the loading slider 52 by a pair of left and right caulking pins 78. The front end 58b side of the leaf spring 58 is configured to be elastically displaceable in the vertical direction with respect to the wide portion 52a. The wide portion 5
2a is attached to the lower surface on the front end side of the wide portion 52a by a pair of left and right flange pins 79 to restrict the downward elastic displacement of the leaf spring 58 on the front end 58a side.

A pair of left and right inclined projections 80 and 81 are integrally formed on the upper portion of the front edge of the opening 77 of the leaf spring 58. The inclined projections 80 and 81 are configured to freely move in and out from below in the cutout portion 69 of the wide width portion 52a and the front end side of the square hole 74. Both of these inclined protrusions 80 and 81 have an inclination that gradually rises as they move rearward. The inclined projection 80 fixes the connecting pin 68 in the notch 69. The front end edge of the wide portion 52a and the front end edge of the leaf spring 58 are formed with inclined guides 82 and 83 that are directed diagonally upward and downward, respectively, in a substantially "C" shape.

The upper and lower tilt guides 8 of the coupler 59 are also provided.
A manual eject hole 84 is formed in the front panel 21 provided in the front position between the Nos. 2 and 83 (see FIGS. 9 and 11).

The loading and ejecting operations of the loading mechanism 50 will be described. First, in the state before the start of loading, the crank pin 71 of the loading motor 36 moves the return position P ₉ on the arrow b direction side in FIG.
And the loading slider 52 is moved back to the returning position P ₁₁ in the direction of arrow b via the loading intermediate slider 53 of the loading mechanism 50. The main slider 37 is moved back to the return position P _{3 in the} direction of the arrow b ′ via the conversion link 51 and is in contact with the slider stopper 41.

The connecting pin 64 of the loading intermediate slider 53 shown in FIG. 9 is fixed in the notch 69 of the loading slider 52 by the inclined projection 80 of the leaf spring 58, whereby the connector 59 is loaded with the loading slider 52. The intermediate slider 53 is integrally formed with the arrows b and b '.
It is slidable in the direction.

Upon completion of insertion of the disc cartridge into the cartridge holder, the loading motor 36 is driven by a signal supplied from the cartridge-in switch.
Is operated, the crank pin 71 is rotated by half a turn in the direction of arrow j from the backward movement position P _{9 in} FIG. 6 to the forward movement position P _{10 in} FIG. 7. At this time, the loading motor 36
It is stopped based on the signal detected by the position detector (not shown). Meanwhile, the crank pin 71 slides the loading intermediate slider 53 in the direction of the arrow b'through the elongated hole 70 of FIG. The connecting pin 64 of the loading intermediate slider 53 moves the loading slider 52 to the return position P via the inclined projection 80 of the leaf spring 58.
Slide drive from _{11 in the} direction of arrow b '.

By this slide drive, the conversion link 5
1 to move the main slider 37 to the forward movement position P _{4 in} FIG.
Is slid in the direction of arrow b. By driving the main slider 37 to slide, the magneto-optical disk device automatically loads the cartridge holder.

[Auto eject operation] The auto eject operation is performed by pressing the eject key or by the eject signal from the computer.
6 is activated again. At this time, the crank pin 71
Arrow j from the forward movement position P _{10 in} FIG. 7 to the backward movement position P _{9 in} FIG.
It is rotated by half a turn in the direction. At this time, the loading motor 36 is stopped based on the signal detected by the position detector (not shown).

During this time, the crank pin 71 is
The loading intermediate slider 53 is slid in the arrow b'direction through the elongated hole 70 of FIG. The connecting pin 64 of the loading intermediate slider 53 slides the loading slider 52 in the direction of arrow b from the forward movement position to the backward movement position P ₁₁ . By this slide drive, the main slider 37 is slid in the arrow b ′ direction from the backward movement position P ₃ via the conversion link 51. As a result, the cartridge holder is automatically ejected from the mounting position to the insertion position as described above.

By the way, when the crank pin 71 is sequentially rotated in the direction of the arrow j by a half rotation between the backward movement position P ₉ in FIG. 6 and the forward movement position P _{10 in} FIG. Through the eject pin lever 55
Are alternately oscillated around the fulcrum pin 72. The eject pin lever 55 swings in the directions of the arrows k and k ′ by the angle θ ₁ between the swing center position P ₁₃ and the swing positions P ₁₄ and P ₁₅ on both left and right sides in FIG.

Therefore, while the crank pin 71 makes a half rotation in the direction of arrow j from the forward movement position P _{10 in} FIG. 7 to the backward movement position P _{9 in} FIG. 6, the eject pin lever 55 moves in the swing center position P in FIG. It will be swung in the direction of arrow k ′ from ₁₃ to the outer swing position P ₁₅ by the angle θ ₁ . At this time, the eject pin 54 of the eject pin lever 55 of FIG.
Pass 5 in the direction of arrow j while pressing 5 in the direction of arrow b.

The eject lever 23 shown in FIG. 12 is momentarily rotated in the direction of arrow g against the torsion spring 25 inserted through the rotating shaft 24. The inner end 23a of the eject lever 23 pushes the eject slider 26 in the direction of arrow b '. As a result, as described above, the auto eject operation for ejecting the disc cartridge is performed in the arrow b'direction which is the outside direction of the cartridge holder.

[Manual Eject Operation] With the disc cartridge being loaded, the magneto-optical disc device loses power, or a failure occurs in the electric control system such as a controller. The cartridge must be ejected urgently. The ejection operation of the disc cartridge is a manual eject operation called a so-called emergency eject. Next, the manual eject operation will be described with reference to FIGS. 10 and 11.

The loaded state of the disc cartridge is shown in FIGS. In the loaded state, the coupler 59 is brought close to the manual eject hole 84 of the front panel 21 from the direction of the arrow b ′. The plate-shaped jig 86 is horizontally inserted in the direction of arrow b from the manual eject hole 84, and the plate-shaped jig 86 is guided by the upper and lower inclined guide pieces 82 and 83 while the plate-shaped jig 86 is loaded by the loading slider. It is pushed between 52 and the leaf spring 58 in the direction of arrow b. Pressed plate jig 86
Is pressed against the left and right inclined projections 80 and 81 of the leaf spring 58 from the direction of the arrow b, and the left and right inclined projections 8 are
0 and 81 are escaped in the downward arrow m'direction, and the leaf spring 58 bends around the rear end 58a of the front end 58b side against the downward elasticity in the arrow m'direction. This allows
The inclined projection 80 is detached downward from the connecting pin 64 to disconnect the loading intermediate slider 53 from the loading slider 52.

When the plate-shaped jig 86 is further pushed in the direction of the arrow b as it is, the tip end of the plate-shaped jig 86 pushes the projecting piece 56a of the manual eject slider 56 in the direction of the arrow b, and the projecting piece 56a. Is brought into contact with the end surface of the cutout portion 74 on the arrow b direction side. As a result, the plate-shaped jig 86 pushes the loading slider 52 in the direction of arrow b via the protrusion 56a. When the plate jig 86 is continuously pressed in the direction of arrow b, the loading slider 52 and the manual eject slider 56 are integrally pressed in the direction of arrow b.
The loading slider 52 slides the main slider 37 in the arrow b'direction from the forward movement position to the backward movement position P ₃ via the conversion link 51. The main slider 37 comes into contact with the slider stopper 41 and stops.

Since the main slider 37 is biased in the direction of arrow b'by the left and right tension springs 40 as shown in FIG. 5, these left and right tension springs 40 are the same as the left and right tension springs 40. Using the restoring force, the main slider 37 can be lightly slid in the direction of arrow b '.

The main slider 37 is slid to the return position P _{3 in the} direction of the arrow b ', so that the cartridge holder containing the disc cartridge is manually raised from the disc cartridge mounting position to the disc cartridge inserting position. You can

When the manual eject slider 56 is pushed in the direction of arrow b with a stroke larger than the normal slide amount, the manual eject slider 5 shown in FIG.
The rear end 56b of the manual eject slider 6 contacts the protrusion 57a of the manual eject slider 57,
Push 7 in the direction of arrow b. As a result, the manual eject protrusion 76 of the manual eject slider 56 is
Pushes the protrusion 87 of the outer end 23b of the eject lever 23 in FIG. 12 in the direction of arrow b.

As a result, the eject lever 23 shown in FIG. 12 is manually rotated in the direction of arrow g, and the eject slider 26 is pushed in the direction of arrow b '. As a result, as described above, the disc cartridge is ejected out of the cartridge holder in the direction of the arrow b '.

After the manual eject operation, if the plate-shaped jig 86 is pulled out of the manual eject hole 84 in the direction of the arrow b ', the front end 58b side of the leaf spring 58 shown by the alternate long and short dash line in FIG. Is gradually returned to the direction of arrow m, and the inclined projection 80 enters from the direction of arrow m to the direction of arrow b, which is the front side of the connecting pin 64.

Thereafter, the power is input, the loading motor 36 is rotated, and the crank pin 71 is moved to the forward movement position P _10.
When the loading intermediate slider 53 is slid in the direction of the arrow b, the connecting pin 64 gets over the inclined projection 80 of the leaf spring 58, and the connecting pin 64 is moved to the return position P ₉ from the return position P ₉ . The notch 69 shown in FIG. As a result, the loading slider 52
The loading intermediate slider 53 and the loading intermediate slider 53 are reconnected by a connecting pin 64, and these are integrally allowed to slide in the directions of arrows b and b ′.

As described above, the loading pin 52A is projectingly formed on the loading slider 52 as a slide member provided in the loading mechanism 50. The loading pin 52A is attached to the main chassis 3
0 is inserted through the hole 12d in the lock arm 12. Therefore, the main chassis 30 has the loading pin 52A corresponding to the movement of the loading slider 52.
The holes 30A are provided by the amount of linear movement. In addition, the hole 12d in the lock arm 12 also has the loading pin 52.
According to the linear movement of A, the lock arm 12 and the loading pin 52A are brought into contact with each other.
When the lock arm 12 abuts, the movable arm of the separation optical system is rotated in a direction to be locked.

13 to 15, a pickup carrier lock mechanism portion for locking the movable pickup portion in the magneto-optical disk device is provided outside the coil bobbin 33A arranged in the voice coil motor 33 as the linear driving means. . By arranging at this position, the space occupied by the pickup carrier lock mechanism in the apparatus is minimized without affecting the functional operation of the voice coil motor 33. The pickup carrier lock mechanism portion has holes 13a and 13b formed in the mounting portion 13 of the lock base 11 of the pickup carrier lock mechanism portion as screw holes, and the screws 13A and 13B.
Then, the main chassis 30 is fixed by being screwed into a tapped portion. In this way, the pickup carrier lock mechanism can be easily attached at these two locations.

Here, FIG. 13 is a plan view showing a state where the pickup carrier lock mechanism is unlocked when a disc cartridge (not shown) is loaded in the magneto-optical disc device. FIG. 14 is a plan view showing that the pickup carrier lock mechanism is in the locked state when the disc cartridge is taken out from the magneto-optical disc device or in the transport locked state.

The plan views shown in FIGS. 13 and 14 are plan views of the back side of the inside of the apparatus in this magneto-optical disk apparatus, and the front side thereof is a loading block for mounting and removing a disk cartridge, which will be described later, and driving the apparatus. A circuit board or the like is mounted. First, the loading pin 52A projectingly formed on the loading slide member shown in FIG. 13 has an arrow b as a direction in which the cartridge holder containing the disc cartridge is inserted from the disc cartridge mounting position to the disc cartridge insertion position.
When the disk cartridge is inserted in the direction, the loading motor 36 rotates according to the output of the sensor and slides according to the movement of the loading slider 52. As a result, the loading pin 52A is locked by the lock arm 12
The lock arm 12 that is in contact with the side surface 12e of the hole 12d is directed in the arrow E direction to resist the biasing direction of the torsion coil spring 18 in FIG. By this operation, the arm claw 12A is pulled in and locked so that the engaging part 33B, which is the end of the coil 33A of the voice coil motor 33 to which the movable pickup part 34 is fixed, does not engage with the arm claw 12A.

Therefore, the movable pickup section 34 can freely move in the directions of arrows b and b '. During this movement, the stopper rubber 4 serves as an impact-resistant member of the movable pickup section 34, and the stopper rubber 4 and the spindle motor 3
It is arranged on one side respectively. When such a lock does not operate, that is, in the unlocked state, the magneto-optical disk device performs operations such as reading data from the disk and writing data to the disk.

The yoke 2a of the voice coil motor 33 is formed, for example, in a "U" shape for inserting the coil claw 12A. The reason why the yoke 2a can be punched and formed will be described later. Even if the pickup carrier lock function unit is provided in the device, the coil claw 12A is inserted through the portion formed by being formed in the yoke 2a, so that it can be suppressed within the height of the voice coil motor. It will be possible to reduce the thickness.

Next, in FIG. 14, the loading slider 52 moves in the direction of arrow b according to the ejecting operation of the disc cartridge. With the movement of the loading slider 52, the loading pin 52A comes into contact with the outer surface 12e side of the lock arm 12 in FIG. This outer surface 12e
By moving the loading pin 52A along with, the notch 2A of the yoke 2a is inserted while rotating in the direction of arrow F. Here, the movable pickup unit 34 is moved to a position facing the optical fixing unit 27 at the outermost peripheral position of the disk as a recording medium in advance before the power is shut off. The movable pickup section 34 and the lock arm 12
Are engaged with the arm claws 12 each having a locking surface 12B whose contact surface with the engaging portion 33B is inclined.

The movable pickup portion 34 corresponds to a lock mechanism portion and has arm claw portions 12 of the lock arm 12.
The movement in the direction of arrow b'is prevented by A and the engaging portion 33B having a convex tip of the bobbin. Further, the movement of the movable pickup portion 34 in the direction of the arrow b is prevented by the stopper rubber 4. In the movable pickup portion 34, the movable range, that is, the amount of backlash is only the gap between the arm claw 12 and the engaging portion 33B.

Therefore, in this locked state, it is possible to prevent the movable pickup portion 34 from moving due to an impact during transportation, and protect the movable pickup portion 34. This can be used not only during transportation but also at the end of normal operation. Also in this case, the pickup carrier lock mechanism electrically moves the movable pickup portion 34 in the direction of the arrow b, and stops it at the position of the stopper rubber 4 arranged at the outermost peripheral position of the disk as the recording medium. After that, the loading motor 36 is driven to load the loading pin 52A.
Returns to the position shown in FIG. The lock arm 12 is biased in the arrow F direction by a torsion coil spring 18 as a biasing means shown in FIG. The biasing force of the spring 18 locks the movable pickup portion 34.

Further, the operation when the disk cartridge is urgently ejected will be described with reference to FIG. The emergency eject is the ejecting operation of the disk cartridge when the normal eject operation cannot be performed due to the power supply being cut off during the use of the apparatus or the failure of the loading motor 36 as described above. As described above, the loading mechanism can be used to eject the disc cartridge.

However, when this emergency eject is performed, the loading pin 52A moves from the position of FIG. 13 to the position of FIG. 15 and is stopped. By the movement of the loading pin 52A, the apparatus has completed the ejection of the built-in disk cartridge. Further, due to the movement of the loading pin 52A, the lock arm 12 is rotated in the arrow F direction by the urging force of the torsion coil spring 18. At this time, the movable pickup section 34 is located at an arbitrary position, and thus is in a state where it is not locked in most cases. The movable pickup unit 34 has a structure shown in FIG.
The bearing 34A is attached as shown in FIG.
In the movable pickup section 34, the above-mentioned bearing 34A attached on the two shafts 2C is rotatable and movable. Thereby, the movable pickup unit 34
Slides in the directions of arrows b and b '.

When the movable pickup portion 34 is moved in the direction of the arrow b at a certain speed, the engaging portion 33B of the movable pickup portion 34 pushes the arm claw 12A of the lock arm 12. The arm claw 12A has the engaging portion 3
The contact surface with 3B is an inclined surface 12C. For this reason,
When the arm claw 12A is pushed by the movable pickup portion 34, the lock arm 12 rotates in the direction opposite to the arrow F. When the arm claw 12A moves to the engagement position of FIG. 14 while contacting the engagement part 33B, the engagement part 33B of the movable pickup part 34 engages with the inclined locking surface 12B of the arm claw 12A.

By this engagement, the movable pickup portion 34
Is locked. After performing the emergency eject process in this way, the movable pickup section 34 is moved to the outermost peripheral position of the disk as the recording medium by orienting the insertion opening side of the device downward and applying vibration. And it can be locked by the lock mechanism. In this way, the movable pickup unit 34 can be locked even in an emergency eject.

With such a structure, the optical movable portion and the optical fixed portion can be locked close to each other as a dust countermeasure for the separation optical system, and thus the exposure of the light input / output portion can be avoided. . With this configuration, the optical movable portion can be locked at the outermost peripheral position of the disc as a recording medium contained in the disc cartridge even in an emergency eject. In addition, this lock requires only a part of the optical movable part to be convex, so
It can contribute to weight reduction. Since the pickup carrier lock mechanism portion is easy to remove and is easy to assemble, the cost of the product with the lock function can be kept low.

A part of the yoke 2a is cut out in order to insert the arm claw 12A of the pickup carrier lock mechanism portion. The reason why the normal operation can be performed without abnormality even if the cutout portion is provided will be briefly described below. The voice coil motor 33 constitutes a magnetic circuit by the permanent magnet 2c and the iron-based yoke portion 2 which is a ferromagnetic body. The yoke portion 2 includes the yoke 2b on the side having the coil 33A wound movably and the coil 3 described above.
A closed magnetic circuit is formed with the yoke 2a not provided with.
The permanent magnet 2c is arranged on the yoke 2a of the yoke portion 2 to generate a magnetic flux in the coil 33A direction.

For this reason, the yoke portion 2 shown in FIG.
This will be described with reference to the external perspective view of the main part. Here, common parts are given the same reference numerals and the description thereof is omitted. Further, in the yoke portion 2 of FIG. 16, the yokes 2a and 2b are integrally formed, and both yokes 2a are provided with cutout portions.

First, the parameters of each part of the voice coil motor 33 used in the pickup carrier lock mechanism will be described. The permanent magnet 2c has a length L, a width W, and a thickness H. The permanent magnet 2c is magnetized in the direction indicated by the arrow G. The magnet area S _{m of the} portion that generates the magnetic field in the permanent magnet 2c can be expressed as S _m = W × L (1) using the above parameters. Moreover, the total magnetic flux phi of the permanent magnet 2c is generating, the residual magnetic flux density B _r of the permanent magnet 2c, a magnet reversible magnetic permeability mu, when the permeance coefficient of the correction coefficient P, phi = B _r × S _m / (1 + μ / P) (2) That is, the total magnetic flux φ generated in the permanent magnet 1 as a whole passes through the cross section S _{L of} FIG.

Here, with the cross section S _min at the boundary of the yoke portion 2 being the origin, the cross section at the position of length X from this position is S _X , and the cross section at the position of length L of the permanent magnet 2 c is S _L. When the thickness of the h _X, and h _L, the cross-sectional area S _X,
S _L is S _X = W × h _X (3) S _L = W × h _L (4)

When the saturation magnetic flux density of the yoke portion 2 is B _Y , the condition W × h _L ≧ φ / B _Y (5) must be satisfied so that there is no leakage. Under this condition, the yoke portion 2 can form a magnetic circuit without saturating the magnetic circuit.

From the equation (5), the relation of B _Y × W × h _L ≧ φ is obtained. From the equations (1) and (2), B _Y × W × h _L ≧ B _r × W × L / ( The relationship of 1 + μ / P) (6) is obtained. This expression (6) is an element that determines the shape of the yoke portion 2. That is, the parameters B _Y , B _r other than the parameters W, h _L , and L of the above equation (6)
If μ and P are put together and expressed by a constant ψ, equation (6)
The width W is erased so that the relationship between h _L ∝Lψ (7) and the thickness h _L of the cross section of the yoke portion 2 is proportional to the length _L of the permanent magnet 1. From the relation of this expression (7), the thickness of the cross section S _X of the yoke portion 2 through which the magnetic flux at an arbitrary position (range: 0 ≦ X ≦ L) of the permanent magnet 1 of FIG. 3 can pass without saturating the yoke portion 2. You can ask for it.

The minimum value of the thickness of the cross section S _X of the yoke portion 2 is defined as h
_{If Xmin} , then from the relationship of equation (7), h _Xmin = h _L × X / L (8) From the relationship of Expression (8), it can be seen that the shape of the yoke portion 2 that does not saturate gradually becomes thinner in accordance with an arbitrary position and becomes the shape shown in FIG. It can be understood that the practical yoke portion of the voice coil motor shown in FIGS. 13 to 15 may be removed as long as such a relationship is satisfied with the arrangement of the pickup carrier lock mechanism. Here, in the voice coil motor 33 shown in FIGS. 13 to 15, the yoke 2b penetrating the coil 33A is designed so that the inductance of the coil 33A does not change due to the change in the cross-sectional area accompanying the movement of the coil 33A. , Has a uniform cross-sectional area. Therefore, in the voice coil motor 33, only the cross-sectional area of the yoke 2a in which the permanent magnet 2c is arranged is cut out according to the relationship of the above expression (8).

On the basis of such a principle, the weight of the pickup carrier lock mechanism can be reduced by notching the yoke portion 2 made of a heavy iron material.

With this structure, the weight of the yoke forming the magnetic circuit of the voice coil motor can be suppressed, and functional parts such as a sensor and a stopper mechanism can be arranged in the region of the deleted member. Therefore, it is possible not only to reduce the weight of the device, but also to reduce the size and thickness of the device.

With the above construction, the pickup carrier lock mechanism can lock the optical movable part and the optical fixed part close to each other as a measure against dust in the separation optical system, and thus the optical input / output part. You can also avoid exposing the. With this configuration, the optical movable portion can be locked at the outermost peripheral position of the disc contained in the disc cartridge even during an emergency eject. Further, since only a part of the optical movable portion needs to be convex for this lock, it is possible to contribute to the reduction in size and weight of the device. This pickup carrier lock mechanism is
Since it is easy to remove and easy to assemble, the cost of the product with the lock function can be kept low. In addition, the device can be made smaller and thinner.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention.

[0093]

According to the pickup carrier lock mechanism of the present invention, the slide member of the loading mechanism is operated to reciprocate the disk cartridge, and the lock arm member is displaced in the horizontal plane of the main chassis to lock. When the disc cartridge is moved from the unlocked side attached to the lock arm member of the mechanism section to the locking side, it is guided by a claw portion having an inclined surface on the unlocked side, By engaging the movable pickup part with the surface and fixing the lock position with the biasing means, it is possible to lock the optical movable part and the optical fixed part close to each other while taking measures against dust in the separation optical system, As a result, it is possible to avoid exposing the light input / output unit.

Further, by providing the claw portion of the lock arm member with the inclined surface, even in the case of an emergency eject, for example, the apparatus is tilted to move the optical movable portion so that the inclined surface of the pawl portion and the movable pickup portion are separated from each other. When the lock arm member is caused to abut and the lock arm member is further moved along the inclined surface while being rotated outward, the pawl portion and the movable pickup portion are engaged by the urging force of the urging means. It can be easily locked and can be locked at the outermost peripheral position of the disc built in the disc cartridge.
Since only a part of the optical movable portion needs to be convex for this locking, it is possible to contribute to the reduction in size and weight of the device.

A cutout portion is provided in the yoke portion of the linear drive means for linearly driving the movable pickup portion, and the claw portion of the lock arm member is arranged in the cutout portion to improve space use efficiency, thereby reducing the size of the apparatus. It can also be made thinner.

Since the lock mechanism section is provided on the outside of the coil bobbin arranged in the linear driving means for linearly driving the movable pickup section, it can be easily removed and is easily assembled. The cost of can be kept low.

[Brief description of drawings]

FIG. 1 is a top view of a pickup carrier lock mechanism in this embodiment when viewed from above.

FIG. 2 is a front view of the pickup carrier lock mechanism shown in FIG. 1 as seen from the direction of arrow A.

3 is a side view of the pickup carrier lock mechanism shown in FIG. 1 as seen from the direction of arrow B. FIG.

FIG. 4 is a side view of the pickup carrier locking mechanism shown in FIG. 1 when viewed from below.

FIG. 5 is an external perspective view of the disk device when the cartridge holder, the main slider, and the sub guide frame are removed, as viewed from diagonally above.

FIG. 6 is a plan view showing a returning position of the main slider on the main chassis.

FIG. 7 is a plan view showing the forward movement position of the main slider on the main chassis.

FIG. 8 is an exploded perspective view of a loading mechanism and a connector.

FIG. 9 is a cross-sectional view of a coupling mechanism between the loading intermediate slider and the loading slider in the forward movement position.

FIG. 10 is a plan view for explaining the operation of the manual eject.

11 is a cross-sectional view when a plate-shaped jig is inserted in the manual eject, and (A) is a view on arrow F shown in FIG.
It is a sectional view in -F, (B) is a sectional view in arrow GG.

FIG. 12 is a plan view showing driving of an eject lever by an eject pin.

FIG. 13 is a plan view of the disk device in which the pickup carrier lock mechanism according to the present embodiment is provided and the lock with respect to the movable pickup unit is released, as viewed from the back side.

FIG. 14 is a plan view of the disk device when the pickup carrier locking mechanism according to the present embodiment is provided and the movable pickup portion is locked at a position on the outermost peripheral side of the disk cartridge when viewed from the back side.

FIG. 15 is a plan view of the disk device as seen from the back side, showing a state in which the pickup carrier lock mechanism according to the present embodiment is arranged and the movable pickup unit is locked after the disk cartridge is ejected in an emergency.

FIG. 16 is an external perspective view of a main part used for explaining the configuration and the operating principle of the voice coil motor used in this embodiment.

[Explanation of reference numerals] 11 ... Lock base 12 ... Lock arm 12A ... Arm claw 12B ... Locking surface 12C ···· Abutting surface 12e ···· Side surface of lock arm hole 13 ····· Hole for mounting screw 14 ···· Rotating shaft 15 ・ ・ ・ ・ ・ Stopper part 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ Torsion coil spring 19 ・ ・ ・ ・ ・ ・ ・ Poly washer 36 ・ ・ ・ ・ ・ ・ ・ Loading motor 50 ... Loading mechanism 52 ... Loading slider 52A ... Loading pin 53 ... Loading intermediate slider 59 ... ........ Connectors

Claims (4)

[Claims] 1. A pickup carrier lock mechanism for preventing movement of a movable movable pickup portion supported on a chassis, wherein a slide member for loading a loading mechanism portion of a disk cartridge and a movement of the slide member are provided. Accordingly, the lock arm member is displaced in the horizontal plane of the chassis to prevent the movable pickup part from moving, and a biasing means for biasing the lock arm member of the lock mechanism part in the lock position direction. A pickup carrier lock mechanism, characterized in that the movable pickup portion is locked at a position on the outermost periphery of a disc contained in the disc cartridge. 2. The pickup carrier lock mechanism according to claim 1, wherein the lock mechanism portion is provided outside a coil bobbin provided in a linear driving means for linearly driving the movable pickup portion. 3. The pickup according to claim 1, wherein a claw member is provided on the lock arm member, and an inclined surface for guiding the movement of the claw member is provided on the side in sliding contact with the locked object. Carrier lock mechanism. 4. The pickup according to claim 1, wherein a cutout portion is provided in a yoke portion of a linear drive means for linearly driving the movable pickup portion, and a claw portion of the lock arm member is arranged in the cutout portion. Carrier lock mechanism.