JPH0142874Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an optical disc recording device.

(Prior Art) A glass disk coated with a photosensitizer to a predetermined thickness is used as a master disc for a video disc or a compact disc, and information is recorded by an exposure method using a laser beam in a recording device. Recording is done in a clean room to avoid dust in the air. It is also important that the master disc is not contaminated by dust, and the less manual intervention is required, the better.

(Problem) However, in the past, the operator of the recording device was responsible for attaching and removing the master disc from the turntable.
The master disc had to be held by hand, and the master disc was often contaminated by people, making it difficult to improve yields.

The object of the present invention is to provide a master disc rotation mechanism that does not require an operator to directly touch the master disc by hand.

(Key points of the idea) In order to prevent the operator from touching the master disc directly with his/her hands, it is possible to place the master disc a few centimeters higher than the top of the turntable so that the master disc can be easily held and mounted using a jig. becomes possible. To make this possible, it is sufficient to provide a support for the master that can raise the master from a rotating mechanism including the turntable to a height of several centimeters above the turntable. For this reason, the present invention uses a piston moved by air pressure as a support for moving the master up and down, resulting in a simple structure that does not impair the balance of the rotating body, making it easier to handle when installing and removing the master. It is.

(Example) An example of the present invention is shown in the figure and explained below.

The figure is a cross section of a rotating mechanism of a recording device to which the present invention is applied, and shows a rotating body 3 having a bearing 2 and an internal cylinder 3a, one end of which is connected to the rotating body 3, and the other end of which is a piston 3.
a spring 3e connected to h, an air passage 4 that supplies air to the cylinder 3a and pushes up the piston 3h, a motor 5 that drives the rotating body 3, and the piston 3.
H has a master disk support 3c and a master disk 6 fixed to the shaft 3b via a shaft 3b, and pressurized air is supplied from the outside to the gap between the bearing 2 and the rotating body 3 through the ventilation path 2a, so that the rotating body 3. Both the turntable 1 and the rotor 5 of the motor are rotatable in a suspended state due to an air film. When pressurized air is supplied from the outside through the ventilation passage 4, the pressurized air fills the air passages 3g and 3f provided in the rotating body 3, and the piston 3h moves upward, causing the piston 3 to move to the lower end of the lid 3d.
It rises until it touches h. The master support 3c provided at the upper end of the piston shaft 3b is lifted from the turntable 1 by this amount of movement. The air in the cylinder 3a is discharged to the outside through the air passage 1b of the turntable 1. When the supply of pressurized air from the outside to the ventilation path 2a is stopped, the piston 3h is pushed down by the spring 3e and returns to the initial position, and the master support 3c also moves down. When the piston 3h has risen completely, the master 6 can be placed on the master support 3c using a predetermined tool. Piston 3h descends and setscrew 1 on the outer periphery of the turntable
By turning a to fix the master so that it does not wobble, the master can be placed on the turntable 3c without touching the master 6. When removing the master disc 6, it is sufficient to loosen the set screw 1a, raise the piston 3h, and remove the master disc.

(Effects) As described above, according to the present invention, removal of the master disc is extremely easy. Therefore, it is easy to mechanize the installation and removal of the master disc.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. 1... Turntable, 2... Air bearing, 3...
...Rotating body, 4...Air passage, 5...Motor rotor, 6...Master disc.

Claims (1)

[Scope of utility model registration request] In an optical disk recording device consisting of a turntable that rotates and holds a recording master on which a desired signal is to be recorded, an air bearing that supports the turntable, and a motor, a piston that moves the turntable up and down with air A rotation mechanism for an optical disc recording device, characterized in that it is provided with.