JP2856234B2 - Disc player pickup position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup position detecting device for a disk player, and more particularly to a pickup position detecting device for detecting an innermost position and an outermost position of a disk for reproducing disk information.

[0002]

2. Description of the Related Art Generally, in an optical disk player such as a compact disk (CD), since information is not recorded on the outermost and outermost portions of the disk, a tracking servo does not operate normally, and the disk motor is not synchronized. Since no signal can be detected, the disk servo does not operate properly. For this reason, a pickup position detection switch using a limit switch is provided so that the pickup does not enter the innermost peripheral portion of the disk (in some cases, the outermost peripheral portion). Conventionally, the following two types of structures have been known as means for providing this position detection switch (see FIG. 2).

In FIG. 2, 1 is a pickup,
The pickup 1 is slidably supported by a guide shaft 3 mounted on a chassis 2 and moves back and forth along the guide shaft 3 below a disc (not shown) held on a turntable 4 to transfer information on the disc. It is designed to read. The position detection of the pickup 1 is performed by one of the following means (a) and (b).

(A) A main printed circuit board 5 (hereinafter referred to as a main circuit board) of a CD section is provided below the chassis 2, and a limit switch 6 is mounted on the main circuit board 5. The innermost position of the disk is detected when the contact portion 1c which moves while being connected to the pickup 1 hits the limit switch 6. The same applies to the outermost position (not shown). (B) A limit switch 7 is fixed to the chassis 2 with screws or the like, and connected to the main board 5 with two lead wires 8. The above (A) is when the main board is directly below the chassis 2.
(B) is a connection method when the main board is not directly under the chassis.

[0005]

However, in such a conventional pickup position detecting device for an optical disk player, the main substrate 5 has a lower part of the pickup 1 because the disk is placed above the pickup 1. Need to be placed in For this reason, there is a disadvantage that the height of the entire player is increased. In the case of (b), the limit switch 7 needs to be fixed to the chassis 2 with screws or the like, and the two lead wires 8 are connected to the main board 5.
, And there is a problem that assembling is troublesome and costly.

The present invention has been made in view of such problems of the prior art. By mounting a pickup position detection switch on a pickup board, there is no need to dispose the main board at the lower portion of the chassis. It is a first object of the present invention to provide a pickup position detecting mechanism of an optical disk player that can reduce the overall height and can easily fix a switch.

It is a second object of the present invention to provide a pickup position detecting device which can prevent a laser diode and a photodiode from being displaced in the optical axis due to contact of the switch by mounting the position detecting switch on a board for connecting an actuator coil. .

According to the first aspect of the present invention, there is provided a position detecting switch for detecting the innermost position and / or the outermost position of the disk of the pickup, and a laser diode, a photodiode, an actuator coil and the like are connected to the side surface of the pickup. In a disk player to which a pickup board as a board for use is fixed, a position detection switch soldered to the pickup board is provided,
A pickup position detection device for a disc player, wherein a switch contact member is fixed to a chassis so that the position detection switch can be turned on and off. The invention according to claim 2, wherein the pickup substrate is A first substrate as a substrate for connecting a laser diode and a photodiode, and a second substrate as a substrate for connecting an actuator coil, wherein the first substrate and the second substrate are separate substrates, The position detection switch is a second switch.
Characterized by being fixed to the substrate by soldering.

[0009]

According to the first aspect of the invention, since the position detection switch is soldered to the pickup substrate, there is no restriction on the arrangement of the main substrate, and no fixing means such as screwing the position detection switch is required. . According to the second aspect of the present invention, the position detection switch is soldered to the actuator coil connection board (second board).
The optical axis shift of the pickup due to the board shift does not occur.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of a pickup position detecting device of a disc player 100 according to the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals. A position detection switch 9 composed of a limit switch is mounted (solder-fixed) on a pickup substrate 10 attached to the side of the pickup 1 so as to detect the innermost peripheral position of the disk. The contact member 11 of the switch 9 is mounted at a position where the position detection switch of the chassis 2 can be turned on and off. The pickup substrate 10 includes:
Any connection substrate such as a laser diode, a photodiode, and an actuator coil may be used. The substrate (first substrate) for connecting the laser diode and the photodiode is a pickup 1 as shown in FIG.
Attached to the front side surface 1a. In this case, the detection switch 9 is also the pickup substrate (first substrate) 1 on the front side.
0 is implemented. 1b shows the other side of the pickup 1.

When the position detection switch 9 is mounted (soldered) on the substrate (first substrate) 10 on which the laser diode and the photodiode are mounted as described above, the position detection switch 9 A substrate shift may occur, which may cause an optical axis shift of the optical pickup. Therefore, the position detection switch 9 may be provided so as to be mounted (solder-fixed) on the actuator coil connection (relay) substrate (second substrate). That is, a board (second board) for connecting the actuator coil is provided separately from the board (first board) on which the laser diode and the photodiode are mounted, and the position detection switch 9 is soldered to this board (second board). It may be fixed.

Next, the operation will be described. When the pickup 1 reaches the innermost circumference of the disk, the detection switch 9 hits the contact member 11 of the switch, and the detection switch is turned on to operate to detect the position. Although not shown, by providing the same means at the rear of the pickup, the outermost position of the disk can be detected in the same manner. In this embodiment, since the position detection switch is mounted on the pickup board 10 attached to the pickup 1, the main board 5
Need not be located at the bottom of the chassis 2,
The detection switch does not need to be screwed, so that the height of the entire player can be reduced, the size can be reduced, and the detection switch can be easily mounted, and the cost can be reduced. Further, by mounting the position detection switch on the actuator connection board, it is possible to further prevent the occurrence of board displacement.

[0013]

As described above, according to the first aspect of the present invention, since the position detection switch for detecting the position of the innermost circumference and / or the outermost circumference of the disk is mounted on the pickup board, the position of the switch can be reduced. The detection switch can be mounted by a general mounting means without using the fixing means, and the detection switch is not required to be mounted on the main board. The height can be reduced, and the size and cost can be reduced. According to the second aspect of the invention, by using the pickup board on which the detection switch is mounted as the actuator coil connection board, it is possible to eliminate the optical axis shift due to the contact of the detection switch.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a pickup position detecting device for a disc player according to the present invention.

FIG. 2 is a perspective view of a conventional pickup position detecting device for a disc player.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pickup 2 Chassis 9 Position detection switch 10 Pickup board 11 Switch contact member

Claims (2)

(57) [Claims] An innermost position of a pickup disk and / or
Or a position detection switch that detects the outermost position is provided ,
Laser diode and photo on the side of the pickup
Used as a connection substrate for diodes, actuator coils, etc.
In a disc player to which all the pickup substrates are fixed, a position detection switch soldered to the pickup substrate is provided, and a switch contact member is fixed to a chassis so that the position detection switch can be turned on and off. A pickup position detecting device for a disc player. 2. The method according to claim 1, wherein the pickup substrate is a laser diode.
First substrate as a substrate for connecting a photodiode and a photodiode
Plate and a second substrate for connecting the actuator coil.
It consists of a substrate, a first substrate and a separate group and the second substrate
And the position detection switch is mounted on the second substrate.
2. The pickup position detecting device for a disk player according to claim 1, wherein the device is fixed by soldering .