JP3513848B2 - Optical disk drive - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD player, etc.
The present invention relates to a technique for preventing contamination of a lens of an optical pickup in an optical disc device using the optical pickup.

[0002]

2. Description of the Related Art For example, in an apparatus (hereinafter referred to as "optical disk device") for irradiating an optical disk with a laser beam to read information recorded on the optical disk, or recording information on the optical disk, such as a CD player. For example, an optical pickup having various optical components such as an objective lens, a beam splitter, and a laser diode is used.

In the above optical pickup, the positional relationship and optical characteristics of each optical component are strictly adjusted in order to narrow the laser beam into a beam spot of a desired size and irradiate the recording surface of the optical disc.

[0004]

By the way, in the optical disc device using the optical pickup as described above, a large number of malfunctions are caused by the optical pickup. That is, in the malfunction, dust or the like that has entered the optical disc device adheres to the surface of an optical component such as an objective lens of an optical pickup, which deteriorates the optical characteristics of the optical component. However, most of the problems occur because an error occurs in reading the information necessary for controlling the relative position of the optical pickup with respect to the optical disc, and a malfunction occurs.

Therefore, in order to prevent the above-mentioned malfunction,
Keep the inside of the optical disc device as closed as possible so that dust and the like do not enter the optical disc device, and prevent dust and the like from adhering to the optical pickup or making it difficult for dust and the like to adhere .
There is a method of that. However, the above method may be applied to a device constituted by a single optical disc device, but in a device in which the optical disc device and another device are combined, the inside of the device is sealed due to the need for heat radiation in the device. It wasn't common because some things couldn't be done.

[0006] When the optical pickup is not used, for example, the optical pickup is moved beyond the outermost peripheral position of the optical disc to a position further outside and the optical component is covered with a cover when the optical pickup is moved to the position. There is also a method. However, in the above method, it is necessary to newly add a drive mechanism for opening and closing the cover, and since the moving distance of the optical pickup becomes long, it is necessary to add a new drive mechanism for opening and closing the cover. It had to be redesigned, which resulted in high cost and was difficult to realize.

[0007]

Therefore, in order to solve the above-mentioned problems, the optical disk device of the present invention can be moved up and down in the housing.
It is movably supported and chucks the optical disc to rotate.
The spindle to be rotated and chucked on the spindle.
Supported movably in the radial direction of the optical disc
A mechanical chassis having a pickup and an optical pickup
The closed position that covers and hides the objective lens
Optical pickup that can be freely moved between the exposed open position
Shutter provided on the housing and the cam part provided inside the housing
Equipped with a slider that slides in contact with the material
When is released, the mechanical chassis is lowered
The rider abuts against the cam member and is pressed and moves backward
While moving the shutter from the open position to the closed position,
When the operation start command is issued, the mechanical chassis can rise.
And move the slider forward to open the shutter.
The shutter drive means for moving the shutter to the position is provided .

Therefore, in the optical disk device of the present invention, it is possible to realize a mechanism of covering the objective lens of the optical pickup with the shutter and preventing the adhesion of dust and the like with a simple structure.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the optical disk device of the present invention will be described below with reference to the illustrated embodiment. In the following embodiments, the optical disk device of the present invention is applied to a stationary compact disk (CD) player.

In the following description, when referring to the front, rear, upper, lower, left and right directions, the upper and lower sides in FIGS. 1 and 2 are referred to as rear and front, and similarly, the left and right are left and right as they are, and the upper and lower sides in FIGS. 3 and 4. Will be referred to as the vertical direction.

The CD player 1 has a housing 2 in which a predetermined member (not shown) is partially arranged and housed.

A mechanical chassis 3 is arranged inside the housing 2. A rear end of the mechanical chassis 3 is rotatably supported by the housing 2, that is, although not described in detail, the rear end is used as a fulcrum for rotation, and operation including loading and unloading of a disk tray described later is performed. A front end portion, which is a rotation end thereof, is rotatably supported so as to move up and down when shifting from a stopped state to operating (reproducing) or vice versa. In addition, the state shown in FIG.
The state in which the mechanical chassis 3 has finished descending, that is, the state in which the mechanical chassis 3 has stopped operating, the state during loading and unloading of the disc tray, and the state shown in FIG. 4 is the state in which the mechanical chassis 3 has finished rising. That is,
This is a state when the mechanical chassis 3 is in operation. And
The vertical movement of the front end of the mechanical chassis 3 is performed by an appropriate means (not shown).

A spindle 4 rotated by a spindle motor (not shown) is provided on the upper surface of the mechanical chassis 3 near the front end. An opening 5 is formed in the center of the upper surface of the mechanical chassis 3 and has a substantially rectangular shape that extends in the front-rear direction.

At the top of the mechanical chassis 3, and
An optical pickup 6 is arranged on the opening 5 so as to be guided by a feed shaft 7 and movable by a feed mechanism 8 in the front-rear direction. That is, the feed mechanism 8 is the rack gear 1 formed on the right side surface of the base 9 of the optical pickup 6.
The pinion gear 11 is driven by a motor (not shown) that meshes with 0, and the optical pickup 6 is moved in the front-rear direction as the pinion gear 11 rotates. The position of the optical pickup 6 is the position on the outermost side of the optical disc (CD) when it is moved to the rearmost position of the mechanical chassis 3, and conversely, when it is moved to the frontmost position. This is the position on the innermost side of the CD. The optical pickup 6 is usually located on the innermost peripheral side.

The optical pickup 6 comprises various optical parts such as a beam splitter and a laser diode (not shown) in addition to the objective lens 12. These constituent parts are arranged at predetermined positions on the base 9 and the case body 13 is provided. Surrounded by.

As shown in FIGS. 1, 2 and 8, the case body 13 has a substantially octagonal lid shape in which the upper and lower dimensions are slightly flatter than the left and right dimensions when viewed from above. It is fixed on the base 9 while covering various optical components.
A substantially elliptical hole 15 is formed on the right side of the upper surface 14 of the case body 13, and the objective lens 12 is exposed to the outside through the hole 15. The spring locking piece 16 and the boss 1 are provided on the front side surface of the case body 13 and the side surface facing diagonally to the front left.
7 are formed respectively.

As shown in FIGS. 1, 2 and 7, the shutter 18 is a thin plate having a shape in which a substantially ladle character is bent to the right side in the middle, that is, the width of the left and right sides increases toward the rear. A main portion 19 having a wide shape, a locking portion 20 extending downward at a substantially right angle from a front edge of the main portion 19 and a part of a left edge subsequent to the front edge, and a front end of a lower surface 21 of the main portion 19 near the front end. In this position, a pivot shaft 22 vertically protruding downward from a position behind the locking portion 20 is integrally formed.

As shown in FIG. 7, the planar shape of the locking portion 20 is such that the wall surface continued from the front edge of the main portion 19 and the left edge subsequent thereto forms a right angle. The front wall 23 and the left wall 24 are L-shaped. The right half of the front side wall 23 has a shape in which a lower portion is bent forward at a right angle from an intermediate position between the upper and lower sides, and is integrally formed as a spring locking piece 25.
From the lower end of the left side wall 24, a pressed piece 26 is integrally formed so as to project obliquely forward. Further, a stopper piece 27 is integrally formed so as to project rightward from the upper portion of the front side wall 23.

As shown in FIGS. 1 and 2, the slider 28, which is one of the constituent elements of the shutter driving means described later, has a substantially plate shape that is long in the front-rear direction and has a main portion extending in the horizontal direction. 29 and the front end of the main portion 29, which protrudes forward and rises vertically, that is,
The action portion 30 having a shape twisted by 90 degrees at the boundary between the main portion 29 and the action portion 30 is integrally formed.
The front end portion 31 of the action portion 30 is made slightly thicker than the other portions, and the front end face is obliquely cut so as to be displaced rearward as it goes downward to form an action surface 32. .

Since the slider 28 has a low coefficient of friction on the surface, the slider 28 is slippery and is formed of a synthetic resin having excellent wear resistance. Further, long holes 33, 33 which are long in the front-rear direction are formed side by side in the main portion 29 in the front-rear direction in parallel with each other. Further, at the right side edge of the main portion 29, the front long hole 33, A position between the boundary portion between the portion 29 and the action portion 30 projects to the right and a pressing shaft 34 is integrally formed vertically upward from the protruding portion.

The slider 28 has the long hole 3
Screws 3 that are screwed into the mechanical chassis 3 through 3 and 33
5, 35 are attached to the upper surface of the mechanical chassis 3, and the screws 35, 35 move forward and backward within the elongated holes 33, 33, so that they are guided by the screws 35, 35 and move on the mechanical chassis 3. It is attached so that it can slide back and forth. When the optical pickup 6 is moved to the frontmost, the slider 28 pushes the pressed piece 26 of the shutter 18 against the push shaft 34 of the slider 28 to move the slider 28 forward so that the acting portion 30 of the mechanical chassis 3 moves. It projects further forward than the front end surface, and as shown in FIGS. 1 and 5, the upper edge 37 of the wall portion 36 inside the housing 2 has the action surface 32.
It comes into contact with or comes close to the lower part of the. And
The slider 28 and the wall portion 36 form a shutter driving means 38.

As shown in FIGS. 1 and 2, the shutter 18 is attached to the case body 13 in the following state. That is, by inserting the rotating shaft 22 into the hole at the center of the boss 17 of the case body 13,
It is attached so as to be rotatable with respect to the spring locking piece 16 of the case body 13 and the spring locking piece 25 of the shutter 18, and an elastic means (coil spring) 39 is stretched. At this time, the main part 1
9 is positioned so as to cover a part of the upper surface 14 of the case body 13, and the stopper piece 27 comes into contact with the front side surface of the case body 13 to rotate counterclockwise when viewed from above by unnecessary pulling force of the coil spring 39. Prevents rotation in the direction. Further, the pressed piece 26 is in a state of being largely projected to the left front side of the case body 13, and the slider 28 is placed in front of the pressed piece.
When the pressing shaft 34 of the slider is positioned and abutted, and the optical pickup 6 is located at the frontmost position of the moving range on the mechanical chassis 3, the slider 28 has the elastic force of the coil spring 39 and the pressed piece 26. By acting via the pressing shaft 34, the forward moving force is urged, and the acting surface 32 comes into elastic contact with or approaches the upper edge 37 of the wall surface 36.

The operation of the CD player 1 and the accompanying operation of the shutter 18 will be described below.

As shown in FIG. 3, the disc tray 40 is pulled out from the front surface of the housing 2 (drawing position).
Then, the CD 41 is placed on or removed from the disc mounting surface (not shown). In this drawer position,
The front end of the mechanical chassis 3 is held in a lowered state. Then, as shown in FIG. 4, the disc tray 40 is C when it is retracted into the housing 2 (retracted position).
D41 is played back.

In the reproduction of the CD 41, when a CD reproduction command is issued at the pull-in position, the front end of the mechanical chassis 3 which has been lowered is raised, and the spindle 4 is also raised so that the upper surface thereof is the center of the CD 41. When the spindle 4 comes in contact with the lower surface of the part and the spindle 4 rises slightly from there,
D41 is lifted from the disc mounting surface of the disc tray 40, chucked by the spindle 4, and the CD41 rotates as the spindle 4 rotates, and stops at the frontmost position on the mechanical chassis 3 in its movement range. The optical pickup 6 which has been used is read by the feeding mechanism 8 while being moved in the radial direction of the CD 41.

When a stop command is issued during the reproduction of the CD 41, the rotation of the spindle 4 is stopped, and at the same time, the optical pickup 6 is moved by its feeding mechanism 8.
The CD that is the most forward in the moving range on the mechanical chassis 3.
It moves to the position corresponding to the innermost circumference of 41, and the mechanical chassis 3
The front end portion of the disc is lowered, and the CD 41 is placed on the disc mounting surface of the disc tray 40. When the disc take-out command is issued, in addition to the operation when the stop command is given, after the CD 41 is placed on the disc placing surface of the disc tray 40, the disc tray 40 is moved from the retracted position. Move to the withdrawal position.

During each operation of the CD player 1, the main part 19 of the shutter 18 is the upper surface 14 of the case body 13 as the front end of the mechanical chassis 3 moves up and down.
The closed position (see FIGS. 2 and 6) that moves upward to cover the hole 15 and hide the objective lens 12 of the optical pickup 6;
Is moved by being driven by the shutter drive means 38 between an open position (see FIGS. 1 and 5) that exposes the objective lens 12 without covering the lens.

That is, when the optical pickup 6 moves to the position corresponding to the innermost circumference of the CD 41, as shown in FIGS. 1 and 5, the pressed piece 26 of the shutter 18 and the pressing shaft 3 are pressed.
4 abuts, and the coil spring 3 transmitted by this abutment
The elastic force of 9 causes the slider 28 to move to the coil spring 39.
The elastic force of acting on the pressed piece 26 and the pressing shaft 34 causes the forward moving force to be urged, and the lower part of the acting surface 32 is urged against the upper edge 37 of the wall surface 36 and the elastic member. They come into contact with or come close to each other. Then, as the front end portion of the mechanical chassis 3 descends, the upper edge 37 of the wall portion (cam member) 36 inside the housing 2 relatively rises while making elastic contact with the acting surface 32 of the slider 28. . At this time, since the working surface 32 is shaped to be displaced forward as it goes upward, the working surface 32 is displaced rearward by being pressed by the upper edge 37 of the wall surface 36, and the slider 28 is moved rearward. Moving. Then, the pressing shaft 3 of the slider 28
4 pushes the pressed piece 26 of the shutter 18 rearward, and the shutter 18 rotates clockwise around the rotation shaft 22 as viewed from above, and moves to the closed position shown in FIGS. 2 and 6. To do.

On the contrary, the upper edge 37 of the wall portion 36 relatively lowers as the front end portion of the mechanical chassis 3 rises. At this time, the slider 28 moves the pressed piece 26 of the shutter 18.
The acting surface 32 is elastically contacted with the upper edge 37 of the wall portion 36 by the urging force of the coil spring 39 acting via the slider 28, as the mechanical chassis 3 rises.
Moves gradually forward and the shutter 18 rotates counterclockwise when viewed from above, and as a result, the shutter 18 automatically returns to the open position, as shown in FIGS.

As described above, in the optical disk device 1 of the present invention, the upper edge 37 of the wall surface 36 inside the housing 2 relatively moves up and down as the front end of the mechanical chassis 3 moves up and down, As a cam member, the slider 28 also comes into contact with the upper edge 37 of the wall surface 36 and the working surface 3 of the slider 28.
The state of contact with the shutter 2 is transmitted to the slider 28, which is shutter driving means, and is moved back and forth to move the shutter 1
8 is to be driven.

[0031]

As is apparent from the above description, the optical disk device of the present invention can move up and down in the housing.
Supported to spin the optical disk by chucking and rotating it.
The spindle and the optical disc chucked to the spindle.
An optical pick-up supported movably in the radial direction of the disk.
Mechanical chassis with a lens and an optical pickup objective
Closed position to cover the lens and expose the objective lens
The optical pickup is mounted so that it can move freely between the open position.
The shutter and the cam member provided inside the housing.
Equipped with a slider that slides, and an operation stop command was issued
When the mechanical chassis descends, the slider
The shutter comes in contact with the cam member and is pressed to move to the rear.
Move from the open position to the closed position, and
When the order is issued, by raising the mechanical chassis
Slider moves forward to move shutter to open position
Since the shutter drive means is provided , the objective lens can be protected from dust and the like when the operation of the optical disk device, which occupies a large proportion of time, is stopped by a simple structure without significantly changing the conventional mechanism. As a result, it becomes possible to greatly reduce the reliability of the optical disk device by reducing the failure caused by dust adhering to the objective lens.

The specific shapes and structures of the respective parts shown in the above embodiments are merely examples of the implementation of the present invention, and the technical scope of the present invention is thereby provided. It should not be construed as limiting.

[Brief description of drawings]

FIG. 1 is a view showing the operation of the optical disk device of the present invention together with FIGS. 2 to 6, and is a plan view of a main part in a state where the mechanical chassis is in the operating position and the shutter is in the open position. It is a figure.

FIG. 2 is a plan view of an essential part in a state where a mechanical chassis is at a stop position and a shutter is at a closed position.

FIG. 3 is a side view schematically showing a state in which the optical disc device is not operating and the disc tray is in a pull-out position.

FIG. 4 is a side view schematically showing an operating state of the optical disc device.

FIG. 5 is a side view of the main part in a state where the mechanical chassis is in the operating position and the shutter is in the open position.

FIG. 6 is a side view of an essential part in a state where the mechanical chassis is at a stop position and a shutter is at a closed position.

FIG. 7 is a bottom view of the shutter.

FIG. 8 is a plan view of a case body.

[Explanation of symbols]

1 ... Optical disk device, 2 ... Housing, 3 ... Mechanical chassis, 4
... Spindle, 6 ... Optical pickup, 12 ... Objective lens, 18 ... Shutter, 28 ... Slider, 36 ... Cam member, 38 ... Shutter drive means, 39 ... Elastic means, 4
1 ... Optical disc

Continuation of the front page (56) Reference JP-A-7-282575 (JP, A) JP-A-6-208726 (JP, A) JP-A-7-134836 (JP, A) Jitsukaihei 3-84917 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B ⁷ /12-7/22 G11B 17/00-17/038 G11B 25/00-25/04 G11B 33/12-33 / 14

Claims (3)

(57) [Claims] 1. A spindle for movably supporting up and down in a housing for chucking and rotating an optical disk,
And an optical pickup that is movably supported in the radial direction of the chucked optical disc to the spindle
Moving the mechanical chassis, and a closed position to hide covering the objective lens of the optical pickup, between an open position exposing the objective lens itself
The shutter provided on the optical pickup is in contact with the cam member provided in the housing to slide the shutter .
Equipped with a rider, the above mechanism will be operated when an operation stop command is issued.
As the chassis descends, the slider moves above
It comes into contact with the cam member and is pressed to move to the rear,
Moving the switch from the open position to the closed position
When the operation start command is issued, the mechanical chassis above
By moving up, the slider will move forward and
Shutter drive to move the shutter to the above open position
Optical disk apparatus characterized by comprising a means. 2. The optical disk device further comprises the sh
The elastic means for urging the actuator to the open position.
The optical disk apparatus according to claim 1, characterized in that it comprises. Wherein said mechanical chassis is rotatable in the vertical direction, when the operation stop instruction is issued, together with the rotating end portion of the mechanical chassis is lowered, when the operation start instruction is issued the optical disk apparatus according to claim 1, characterized in that the rotating end portion of the mechanical chassis is increased.