JPH0793947A - Disc player apparatus - Google Patents

Abstract

PURPOSE:To improve the reliability of a read accuracy of a pickup. CONSTITUTION:A disc 2 is loaded on a turntable 1 which has a diameter equal to or greater than that of the disc, and a pickup 3 is provided at a side opposite to the disc 2 via the turntable 1, whereby data on the disc 2 are read. In the optical disc apparatus, the turntable 1 is made at least in part of a transparent member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player device such as a CD (compact disc) player or an MD (mini disc) player / recorder.

[0002]

2. Description of the Related Art Generally, in an optical disc device (including a magneto-optical disc device), an optical pickup is moved in the radial direction of the disc in order to read information from the disc. Then, in order to focus the lens provided in the optical pickup on the recording surface of the disc, the lens is moved up and down by the focus servo.
The pickup is arranged on the opposite side of the disc across the turntable, and is configured to read information on the optical disc.

[0003]

For this reason, the diameter of the turntable is set to be inside the recording surface of the disc so that the pickup can read the information on the disc. Therefore, the disk is supported only in the vicinity of the center, and the stability of the disk is poor (Japanese Patent Laid-Open No. 170749/1992). Further, when the lens provided in the pickup is moved up and down, the vibration is transmitted from the pickup to the spindle motor that rotationally drives the turntable through the chassis and reaches the disc mounted on the turntable. Is unstable and may cause a resonance state. When the resonance occurs, the focus servo of the lens of the pickup malfunctions, and it is difficult to read information. The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to prevent the disk from resonating due to the vibration accompanying the vertical movement of the lens of the pickup, thereby improving the reliability of the focus servo. To provide such a disk device.

[0004]

Therefore, according to the present invention, the turntable has a diameter equal to or larger than the diameter of the information recording portion of the disc, and the turntable is sandwiched to pick up on the side opposite to the disc. Is arranged so that the information on the disc can be read out, and part or all of the turntable is formed of a transparent member.

[0005]

The disk is securely supported by using a turntable having a diameter equal to or larger than the diameter of the information recording portion of the disk. As a result, the disc does not resonate even if the vibration generated by the vertical movement of the lens of the pickup is transmitted to the disc, so that the information on the disc can be reliably read. Further, since the turntable is formed of a transparent member, even the pickup arranged on the opposite side of the disc with the turntable sandwiched therebetween can reliably and transparently read the information on the optical disc.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an optical disk device of the present invention. In FIG. 1, reference numeral 1 is a turntable, and an optical disk 2 is placed on the turntable 1. An optical pickup 3 is arranged on the opposite side of the optical disc 2 with the turntable 1 in between. A spindle motor 4 for driving the turntable 1 to rotate is provided below the turntable 1, and the turntable 1 and the spindle motor 4 are connected by a shaft 4a. The spindle motor 4 is fixed on a chassis (not shown). Further, since the turntable 1 is formed of a transparent member, even if the optical pickup 3 is provided on the opposite side of the turntable 1, the information recorded on the optical disc 2 can be surely read. Here, the diameter of the turntable 1 is slightly larger than the diameter of the optical disc 2 placed on the table, but the diameter of the table 1 is the diameter of the information recording portion 5 (see FIG. 2) of the optical disc 2. And the same or larger. The information recording section 5 includes a lead-in area, a program area,
Includes lead-out area. Further, if the diameter of the turntable 1 ends in the middle of the information recording section 5 (chain line in FIG. 2), the refractive index of light changes at the outer peripheral edge of the turntable 1 and a good information reading action is obtained. Absent.

When the turntable 1 on which the optical disk 2 is placed is rotationally driven by the spindle motor 4, the optical pickup 3 slides along the guide shaft 6 so as to follow it. The lens 3a provided in the optical pickup 3 moves up and down so as to focus on the recording surface of the optical disc 2. The vibration generated by the vertical movement of the lens 3a is transmitted from the optical pickup 3 to the spindle motor 4 through the guide shaft 6 and the chassis 7 to which the guide shaft is fixed, and further to the optical disc 2 on the turntable 1. To reach. However, since the entire surface of the optical disc 2 is supported on the turntable 1, the vibration transmitted along with the vertical movement of the lens 3a is rapidly attenuated and the resonance state does not occur. When the disc actually rotates, the clamper 8
(Fig. 1) descends and sandwiches the disk 1 with the clamper 8 and the turntable 1,
The rotation of the disc is made more stable. Therefore, the larger the diameter of the clamper 8, the greater the effect of stabilizing the disk rotation. In FIG. 1, the diameter of the clamper 8 is about 1/4 that of the turntable 1, but it may be about the same as that of the turntable 1.

[0008]

According to the present invention, since it is configured as described above, the optical pickup arranged on the opposite side of the disc with the turntable interposed therebetween can surely read the information on the optical disc. Moreover, since the optical disc does not resonate due to the vibration caused by the vertical movement of the lens of the optical pickup, the reliability of the focus servo is improved. Therefore, the signal recorded on the optical disc can be reliably read.

[Brief description of drawings]

FIG. 1 is a side view of an optical disk device of the present invention.

FIG. 2 is a plan view of an optical disc.

[Explanation of symbols]

 1 turntable 2 optical disc 3 optical pickup

Claims (1)

[Claims] 1. The turntable has a diameter equal to or larger than the diameter of the information recording portion of the disc, and a pickup is arranged on the opposite side of the disc with the turntable sandwiched between the disc and the information on the disc. A disc player device for reading data, wherein part or all of the turntable is formed of a transparent member.