JPH11144404A - Connecting structure between pickup and printed circuit board in disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a height and a width of a connecting structure between a pickup and a printed circuit board by a flexible printed circuit board in an optical disk apparatus. SOLUTION: A first printed circuit board 2 is provided, in the vicinity of a moving end of a pickup 1 on the rotation center side of a disk 5 in an optical disk apparatus, at a height position in the extending direction of a transition path of the pickup 1. Electronic components for processing a signal in connection with the pickup 1 are mounted on the first printed circuit board 2. The first printed circuit board 2 and the pickup 1 are connected by a flexible printed circuit board 4 in such a condition as to allow the pickup 1 to move.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a structure for connecting a pickup of a disk drive and a printed board with a flexible printed board.

[0002]

2. Description of the Related Art Conventionally, the structure shown in FIGS. 3, 4 and 5 has been implemented as this kind of connection structure. FIG. 3 shows a state in which a first printed circuit board (2) is provided below a pickup (1) moving in a radial direction of a disk (5), and a second printed circuit board (3) is provided on an extension of a transition path of the pickup (1). The flexible printed circuit board (4) is extended from the pickup (1) to the second printed circuit board (3) side, turned 180 degrees, and passed between the pickup (1) and the first printed circuit board (2). The terminal (22) is turned over by 180 ° and the lower end of the first printed circuit board (2).
Connected to

In this case, between the pickup (1) and the first printed board (2), a large clearance C is provided so that the flexible printed board (4) does not interfere with both the pickup (1) and the first printed board (2). Must be provided, and the height and width of the connection structure between the pickup (1) and the first printed circuit board (2) are increased, which hinders a reduction in the thickness of the disk device.

The flexible printed circuit board (4) has bent portions (41) and (41) at two places on the side of the second printed circuit board (3) and on the terminal (22) side of the first printed circuit board (2). In addition, the load when the pickup (1) moves is increased, which adversely affects the sliding performance of the pickup (1) and causes a reduction in reliability.

FIG. 4 shows a pickup in FIG.
(1) First printed board (2) and second printed board (3)
In the positional relationship described above, a terminal (22) is provided on the upper surface of the first printed circuit board (2) at a position that does not interfere with the pickup (1), and the flexible printed circuit board (4) extending from the pickup (1) is connected to the terminal (22). Connected to.

In this case, no clearance is required between the pickup (1) and the first printed board (2) for passing the flexible printed board (4).
And the first printed circuit board (2) as close as possible, which contributes to reducing the thickness of the disk device.

However, the pickup (1) is a disk
When the flexible printed board (4) moves toward the rotation center (51) of (5), it buckles against the second printed board (3), and the buckling portion is damaged due to repeated buckling.

FIG. 5 shows that a printed circuit board (6) is arranged on the side and outside of the disk (5) in a direction perpendicular to the disk (5).
Pickup (1) that slides below the disc (5)
And flexible printed circuit board (6)
Connected in (4). In this case, the printed circuit board
Since the disk (6) is disposed on the side and outside of the disk (5) and perpendicular to the disk (5), the disk device must be large as a whole.

According to the present invention, a connection structure between a pickup and a printed wiring board of a disk drive which can reduce the thickness of the disk drive, improve the slide stability of the pickup, and prevent buckling damage of the flexible printed circuit board is clarified. Is what you do.

[0010]

A connection structure between a pickup and a printed wiring board according to the present invention is a pickup for a disk drive.
An electronic component for processing a signal related to the pickup (1) is mounted at a height position on the extension of the transition path of the pickup (1) in the vicinity of the rotation center side moving end of the disk (5) of (1). A first printed circuit board (2) is provided, and the first printed circuit board (2) is provided.
(2) The flexible printed circuit board with the pickup (1) in a state where there is room to prevent the movement of the pickup (1)
Connected in (4).

Specifically, a disk to be set
A second printed circuit board between (5) and the first printed circuit board (2)
(3) is provided, a cutout (32) is formed in the second printed circuit board (3) on the opposite side to the pickup (1), and a flexible printed circuit board (4) extending from the pickup (1).
Is the second printed circuit board from above the second printed circuit board (3)
It enters the notch (32) of (3), turns over and turns the first printed circuit board (2)
Is connected to.

[0012]

[Operation and Effect] First printed circuit board (2) connected to pickup (1) via flexible printed circuit board (4)
Is disposed close to the inner transition end of the pickup (1) by extending the transition path of the pickup (1), so that the printed circuit board can be moved below the pickup (1) or the disc (5) as in the related art. The height and thickness of the connection structure between the pickup and the printed wiring board and the overall size thereof can be reduced as compared with the case where they are provided upright on the side and outside, and this contributes to downsizing of the disk drive.

Further, the bent portion (41) of the flexible printed board (4) occurs only at one place, and the pickup (1)
The slide resistance of the pickup (1) can be reduced, and the slide stability of the pickup (1) can be improved.

In addition to the first printed circuit board (2), a second printed circuit board is provided between the first printed circuit board (2) and the disk (5).
Even when (3) is provided, the notch (32) is opened in the second printed circuit board (3) on the side opposite to the pickup (1) side, so that the flexible printed circuit board extending from the pickup (1) is opened. By picking up (4) from above the second printed circuit board (3) into the notch (32) of the second printed circuit board (3), inverting and connecting to the first printed circuit board (2),
Even if (1) slides, the flexible printed circuit board (4) does not buckle against the second printed circuit board (3),
Damage to the flexible printed circuit board (4) can be prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a disk set on a first printed circuit board (2), a second printed circuit board (3) and a turntable (not shown) for a pickup (1).
(5) In the embodiment, the arrangement of the optical disk is shown, and FIG.
FIG. 3 is a view as viewed from below.

As is well known, the pickup (1) has a lens (12) mounted on a slider (11) so that the recording / reading lens (12) moves in the radial direction of the upper disk (5). And a slide drive device (not shown).

Below the disk (5), the first printed circuit board (2) is placed on the disk (5) substantially in line with the extension of the transition path of the pickup (1), specifically, at the height of the lower surface of the slider (11). It is arranged in parallel with 5). The first printed circuit board (2) has electronic components for mainly processing signals from the pickup (1).

A second printed circuit board (3) is provided between the first printed circuit board (2) and the disk (5). The second printed circuit board (3) has mounted thereon electronic components such as a disc discrimination switch, an erroneous erasure prevention switch, and a pickup innermost peripheral position detection switch.

The inner ends (20) and (30) of the first printed circuit board (2) and the second printed circuit board (3) on the side of the pickup (1) are located at the center of rotation (51) of the disk (5). In the state where it reaches the moving end on the side, it is close enough not to interfere with the pickup (1), and the outer ends (21) and (31) of the first printed board (2) and the second printed board (3) are The length of the disk (5) projecting outward from the outer periphery is reduced.

A pickup is provided on the second printed circuit board (3).
A notch (32) is opened from the opposite side of (1).

Pickup (1) and first printed circuit board (2)
Flexible Printed Circuit Board (4)
Extends from the pickup (1) above the second printed circuit board (3) in parallel with the disk (5), enters the notch (32) of the second printed circuit board (3), turns over and reverses the first printed circuit board. substrate
It is connected to the terminal (22) protruding from the upper surface of (2).
The length of the flexible printed circuit board (4) is
Even if (1) reaches the moving end on the outer peripheral side of the disk (5), a certain margin is provided.

A first printed circuit board connected to the pickup (1) via the flexible printed circuit board (4)
Since (2) is disposed close to the inner transition end of the pickup (1) by extending the transition path of the pickup (1), the printed circuit board can be moved below the pickup (1) or the disc ( 5) Compared to the case of standing up on the side and outside,
The height, thickness, and overall size of the connection structure between the pickup and the printed wiring board can be reduced, which can contribute to miniaturization of the disk device.

Further, the bent portion (41) of the flexible printed board (4) occurs only at one place, and the pickup (1)
The slide resistance of the pickup (1) can be reduced, and the slide stability of the pickup (1) can be improved.

A pickup is provided on a second printed circuit board (3) provided between the first printed circuit board (2) and the disk (5).
Since the notch (32) is opened on the opposite side to the (1) side, the flexible printed circuit board (4) extending from the pickup (1)
From above the second printed circuit board (3).
Insert into the notch (32) of (3) and turn over to make the first printed circuit board (2)
The flexible printed circuit board (4) is connected to the second printed circuit board even if the pickup (1) slides.
The flexible printed circuit board (4) can be prevented from being damaged without buckling upon (3).

In carrying out the present invention, the second printed circuit board
By adding the function of (3) to the first printed circuit board (2), the second printed circuit board (3) can of course be omitted, and various modifications can be made within the scope of the claims. Is possible.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a connection state by a flexible printed circuit board.

FIG. 2 is a bottom view of the same.

FIG. 3 is a schematic front view of a connection state using a conventional flexible printed circuit board.

FIG. 4 is a schematic front view of a connection state using a flexible printed circuit board according to another conventional example.

FIG. 5 is a schematic front view of a connection state using a flexible printed circuit board according to another conventional example.

[Explanation of symbols]

 (1) Pickup (2) First printed board (3) Second printed board (4) Flexible printed board

Claims (2)

[Claims] 1. A pickup (1) of a disk apparatus which approaches a moving end of a disk (5) on a rotation center side of the disk (1).
At the height position on the extension of the transition path of (1), the pickup (1)
A first printed circuit board (2) on which electronic components for processing signals relating to the first printed circuit board are mounted is provided, and the first printed circuit board (2) and the pickup (1) are set in a state where there is no room to prevent the movement of the pickup (1). Connection structure between the pickup of the disk device and the printed board connected by the flexible printed board (4). 2. A second printed circuit board (3) is provided between a disk (5) to be set and a first printed circuit board (2), and a pickup (1) is provided on the second printed circuit board (3). Notch (32) was opened on the other side, and pickup (1)
The flexible printed circuit board (4) extending from the second printed circuit board (3) is cut out (32) from above the second printed circuit board (3).
2. The connection structure between a pickup of a disk device and a printed circuit board according to claim 1, wherein the connecting means is connected to the first printed circuit board after invading the first printed circuit board.