JPH06243513A - Master plate cutting device - Google Patents

Abstract

PURPOSE:To exactly set and hold a master plate on the prescribed position of a turn table by projecting its surface. CONSTITUTION:The turn table 3 which is freely rotatably supported by means of a driving source 17 and is loaded with the master plate 1 on its front surface side is installed into a housing 6. A holder 30 having a supporting member 31 which supports the base of the master plate 1, a lifting mechanism 9 which is installed below the master plate 1 and moves vertically according to air pressures and a chucking arm 8 which engages with the lifting mechanism 9 and turns between a non-contact position where the arm parts from the master plate 1 and a contact position where the arm sets and holds the master plate 1 by coming into contact with the outer peripheral surface of the master plate is installed onto the turn table 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc master cutting device, and more particularly to a CD (Compact Disc) or LD.
The present invention relates to improvement of a disc master cutting device for recording desired data on a disc master such as a (Laser Disc) or MD (Mini Disc).

[0002]

2. Description of the Related Art Conventionally, the writing surface of a disc master such as a CD, LD or MD (hereinafter, simply referred to as "disc master surface").
In general, a disc master cutting device for recording desired data generally has a disc master (for example, a glass coated with a photoresist) at a predetermined position of a rotary disc rotatably supported by a housing through a bearing. Data is recorded (cutting) by fixing the plate) and rotating the rotating disk while focusing the laser light on the surface of the disk master using the write head.

As shown in FIGS. 5 to 7, the disc master cutting device is installed on a housing 6, and a disc master rotating device 20 for holding the disc master 1 on its upper surface side with its cutting surface horizontal, and a housing. And a writing device 21 having a writing head 10 which is moved forward and backward in the radial direction of the disk master 1 loaded on the rotary disk 3 by a linear motor device 7 installed on the disk 6.

The disk master rotating device 20 includes a rotary drive source 17 installed on the housing 6, a rotary disk 3 rotatably supported on an upper part of the drive source 17, and a disk master 1 loaded on the upper surface side thereof. A holding device 40 for holding the master disk 1 is provided on the rotary disk 3. The holding device 4
Reference numeral 0 denotes a disc master 1 loaded on the upper surface of the rotary disc 3.
A supporting member 31 for supporting the lower surface of the disk master, and a disk master holder 4 for vertically positioning the loaded disk master 1.

A ring-shaped convex portion 19 having an inner diameter substantially equal to the diameter of the disk master 1 is integrally formed on the upper surface of the rotary disc 3, and on the concentric circle inside the convex portion 19,
Support pins 2d which come into contact with the lower surface of the disk master 1 are slidably arranged on the rotary plate 3 at three positions at equal intervals.
A coil spring 2 for urging the support pin 2d upward is inserted on the lower surface of d. By placing the disc master 1 on the support pins 2d, the disc master 1 has an upper surface protruding at least above the upper surface of the convex portion 19 and an outer peripheral side surface of the inner peripheral surface of the convex portion 19. It is loaded in close contact with.

The disc master holder 4 has the convex portion 1
9 has an inner diameter equal to the outer diameter of 9 and is provided with a cylindrical portion 34 higher than the height of the convex portion 19 and a thin plate-shaped annular flange 35, and the disk master 1 is placed on the support pin 2d. Then, the lower surface of the flange 35 is brought into contact with the upper surface of the cylindrical portion 34 so as to be detachable. At this time, the lower surface of the flange 35 engages with the outer peripheral surface of the upper surface of the disk master 1 to push down the disk master 1 against the urging force of the coil spring 2, and the upper surface of the cylindrical portion 34 and the disk. Master 1
Make the same height (surface position) as the upper surface of. As described above, the expansion and contraction of the coil spring 2 allows the upper surface of the cylindrical portion 34 and the upper surface of the disk master 1 to be at the same height even if the thickness of the disk master 1 to be loaded is different, so that the disk is The surface position of the master 1 can always be maintained at a constant height. After that, the disk master 1 is securely held in the correct position by screwing and fixing the disk master 4 to the rotary disk 3 with the screws 5A. In order to perform accurate cutting on the surface of the disk master 1, it is important to securely hold the disk master 1 in an accurate position.

In this way, the disk master 1 is placed on the turntable 3.
While holding the above, the write head 10 described above is moved to a predetermined write start position on the outer peripheral portion of the disk master 1 by the linear motor device 7, and in this state, the rotary drive source 1
The rotary table 3 is rotated by 7 and the linear motor device 7
By gradually moving the write head 10 inward by the laser light, the surface of the disk master 1 is narrowed down by the write head 10 to irradiate the laser light.
Cut the surface spirally. This writing device 2
1 is designed so that the gap formed by the write head 10 and the surface of the disk master 1 loaded on the rotary disk 3 is as small as possible for precision cutting.

When the cutting is completed, the writing head 10 is moved to the rotary disk 3 by the linear motor device 7.
After retreating to the retreat position outside, the screws 5A are removed, and the disc master 4 is removed from the rotary disc 3, whereby the disc master 1 is taken out to the outside and stored by a desired method. Incidentally, FIG. 5 is a plan view showing a part of a conventional disc master cutting device, and FIG.
It is a B sectional view.

However, in the disc master cutting device, even if the gap formed between the surface of the disc master 1 held on the rotary disc 3 and the write head 10 is made as small as possible, the flange 35 of the disc master press 4 is set to the disc 35. Since it has a structure that engages with the outer peripheral portion of the upper surface of the master disk 1, this flange 35 has a structure that is higher than the surface of the master disk 1 and projects upward.

On the other hand, the write head 10 is designed to move in the radial direction, and has a structure that cannot be moved in the vertical direction (perpendicular to the surface of the disk master 1). Therefore, the disc master 1
Of the write head 10 from the outside of the disk to the cutting position of the disc master 1 and from the cutting position to the outside of the disc master 1.
There is a problem in that the write head 10 and the disk master disc 4 interfere with each other (clash) with each other when the disk is moved, causing a failure.

Therefore, in recent years, as shown in FIG. 8, a part of the disc master 4 is removed (notched) to form a portion having the same height as the surface of the disc master 1, that is, a notched portion 14. When the write head 10 is formed and is moved, the cutout portion 14 is passed therethrough,
The disc master holder 4 and the write head 10 are prevented from interfering with each other. FIG. 8 is a plan view showing a part of a conventional disc master cutting device.

[0012]

However, in the conventional example in which the notch portion 14 is formed in the disk master holder 4, the conventional example in which the write head 10 is moved to the cutting position of the disk master 1 or from the cutting position is described. When the disk master 1 is moved to the outside, a wasteful work of aligning the position of the write head 10 with the notch portion 14 is added, which causes a problem of lowering productivity. In addition, the alignment has been one of the causes of hindering automation of the disc master cutting device.

An object of the present invention is to solve such a problem of the conventional example, and a disc master cutting capable of accurately holding the disc master without protruding a member above the disc master. The purpose is to provide a device.

[0014]

In order to achieve this object, the present invention detachably holds a turntable which is rotationally driven by a drive unit and a disc master disposed on the upper surface side of the turntable. In a disc master cutting device comprising a holding device and a write head for cutting a disc master surface held on the rotating disc, the holding device includes a support member for supporting a bottom surface of the disc master, and a free end at one end. Has a contact portion facing the disc master, the other end of which extends along the lower surface of the disc master, and the other end of the rotary arm that engages with the rotary arm. A disk master cutting device comprising: a rotation mechanism that rotates between a non-contact position separated from the disk master and a contact position contacted with a side surface of the disk master. It is intended to provide.

[0015]

In the disc master cutting device according to the present invention, the disc master is placed on the support member and the surface height thereof is adjusted with the pivot arm pivoted to the non-contact position by the pivot mechanism. After that, by rotating the rotating arm to the contact position by the rotating mechanism, the contact portion of each rotating arm is brought into contact with the outer peripheral surface of the disk master,
It is possible to hold the disc master in a state in which the upper surface of the disc master protrudes above the other members.

[0016]

Embodiments of the present invention will now be described with reference to the drawings. 1 is an overall configuration diagram of a disc master cutting device according to the present invention, and FIGS. 2 and 3 are FIG.
2 is a partial sectional view of the disk master cutting device shown in FIG. 4, and FIG. 4 is a partially enlarged view of FIG.

The disk master cutting device shown in FIGS. 1 to 4 is installed on a housing 6 and a disk master rotating device 20 for holding the disk master 1 on the upper surface side and holding the cutting surface horizontal is provided on the housing 6. It is installed on the mover 7b of the linear motor device 7 having the installed stator 7a and the mover 7b slidably fitted on the stator 7a. A writing device 21 having a writing head 10 that is moved forward and backward in the radial direction of the disk master 1 loaded on the rotary disk 3.

The disk master rotating device 20 includes a rotary drive source 17 installed on the housing 6, a rotary disk 3 rotatably supported on the upper part of the drive source 17, and a disk master 1 mounted on the upper surface of the rotary disk 3. And a holding device 30 for holding the disk master 1 arranged on the rotary disk 3. As shown in FIGS. 2 to 4, the rotary drive source 17 has a spindle 15 rotatably supported in a cylindrical housing 17a via a bearing 11, and the spindle 15 is
The lower end thereof is connected to a motor (not shown) incorporated in the housing 17a and is driven to rotate in one direction, and the ring-shaped bearing retainer 38 provided on the spindle 15 and the bearing 11 is used to The turntable 3 is fixed to the upper part.

Here, in the turntable 3, the screws 53 are inserted from above into the through holes formed at three positions on the same circle in the vertical direction from the upper surface side at equal intervals, and the screws 53 are attached to the bearing pressing portion 38. It is fixed by screwing. The holding device 30 is a supporting member 31 that supports the lower surface of the disk master 1 mounted on the upper surface of the rotary disk 3, and a rotating mechanism that is installed below the disk master 1 and that moves vertically according to air pressure. The lifting mechanism 9 and the holding mechanism 32 that is rotated by the lifting mechanism 9 and holds the outer peripheral side surface of the disk master 1.

The support member 31 has three through holes 2a penetrating vertically in the same circle at the central position of the rotary disk 3 at equal intervals, and the lower surface side of these through holes 2a is closed in a ring shape. The ring-shaped plate 2b is closed to form the pin accommodating portions 2c, and the support pins 2d whose upper ends abut against the lower surface of the disk master 1 are slidably disposed in the pin accommodating portions 2c. A coil spring 2 for urging the support pin 2d upward is interposed between the lower surface of the and the upper surface of the closed ring-shaped plate 2b,
The ball portion 2e is rotatably mounted on a spherical seat formed on the upper end of the support pin 2d. The closed ring-shaped plate 2b should be screwed onto the lower surface of the turntable 3 on the same circle at the central position thereof and at a position displaced by 60 degrees from the position where the support member 31 is disposed. Is fixed to the lower surface of the turntable 3.

The lifting mechanism 9 comprises a piston 2 formed at the upper end of a central opening 15a formed in the spindle 15.
2a and a pneumatic cylinder 22 having a piston rod 22b connected thereto, and an upper end of a piston rod 22b slidably penetrating the rotary disc 3 and protruding upward, fixed by a screw 52, and supported by a supporting member 31. It is provided with a disc 16 having a diameter capable of being housed inside, a piston 22a, and a return spring 5 inserted between a closing plate 13 closing the central opening 15a.

The piston 22a has a central opening 15a.
A seal member 36 that slidably contacts the side wall surface is circumferentially provided, and a cylindrical seal member 33 is circumferentially provided at a slidable contact portion between the piston rod 22b and the rotary disk 3, and these seal members 33,
An air chamber 37 is formed by 36, the piston 22a, and the side wall surface of the central opening 15a. A gas passage 26a bored in the spindle 15 is communicated with the air chamber 37, and the gas passage 26a is an air passage (not shown) formed in the cylindrical housing 17a as shown in FIG. 2) via an air supply pipe 26 communicating with
The position electromagnetic direction switching valve 27 is connected to the A port, the B port of the electromagnetic direction switching valve 27 is connected to the pressurized air supply source 28 such as a compressor, and the C port is open to the atmosphere. In the normal position where the control signal CS supplied from the controller 39 to the solenoid 27a is in the off state, the electromagnetic directional control valve 27 connects the A port and the C port to open the pneumatic cylinder 22 to the atmosphere, and the control signal CS
At the offset position where is on, the A port and the B port are communicated with each other to supply the pressurized air from the pressurized air supply source 28 to the pneumatic cylinder 22.

The disk 16 has three through holes 29a penetrating in the up-down direction at equal intervals on the outer peripheral edge thereof. The through holes 29a project downward from the disk 16 and the lower end surface Is fitted with an engaging element 29 formed in a hemispherical shape, and the engaging element 29 is screwed into the screw 55 from the outer peripheral surface side.
Is fixed by. The holding mechanism 32 is fixed to the outer peripheral portion of the upper surface of the rotating disk 3 and has an upper portion having an inner diameter larger than the outer diameter of the disk master 1 and a cylindrical body 23 having a substantially L-shaped cross section, and a bottom plate 23 a of the cylindrical body 23. The chucking arm 8 as a rotating arm disposed above the support member 31 at a position deviated by 60 degrees in the circumferential direction is provided.

Here, a flange portion 23b extending inward is formed at the upper end portion of the cylindrical body 23 on the inner peripheral surface side of the upper end surface, and the flange portion 23b is larger than the outer diameter of the disc master 1. Has an inner diameter. Also, the chucking arm 8
Has an arm portion 8a that is L-shaped and extends from the bent portion into the cutout portion 23c formed in the flange portion 23b, and an arm portion 8b that extends inwardly from the bent portion. And a connecting portion of 8b are rotatably supported by a pin 18 supported by a support piece 23d that is planted on the bottom plate 23a of the cylindrical body 23, and the outer periphery of the disk master 1 is attached to the inner side surface at the free end of the arm portion 8a. An abutting portion 48 that is in contact with the side surface and is configured by a rubber pad, for example, is detachably provided by a screw 51, and the free end of the arm portion 8b faces the lower surface of the engaging element 29 attached to the disk 16, and further the arm portion A return spring 12 is inserted between the lower surface of 8b and the upper surface of the turntable 3. Then, as shown in FIG. 4, the chucking arm 8 includes a step portion 22c of the piston rod.
However, the contact portion 48 in contact with the seal member 33 is in a non-contact position in which the contact portion 48 is spaced outward from the outer peripheral side surface of the disk master 1, and the pressurized air is supplied to the air chamber 37, so that the piston 2
The contact portion 51 in the state where 2a is lowered is the disc master 1
It rotates between the abutting position where it abuts the outer peripheral side surface of the.

Next, a specific operation of the disc master cutting device according to this embodiment will be described. First, the controller 39 controls the control signal C for the electromagnetic directional control valve 27.
With S turned off, the electromagnetic directional control valve 27 opens the air chamber 37 of the pneumatic cylinder 22 to the atmosphere, whereby the piston rod 22b is moved upward by the return spring 5 so that the step portion 22c of the piston rod 22b abuts the seal member 33. It is assumed that the chucking arm 8 is rotated by the return spring 12 in the clockwise direction in FIG.

In this state, the abutting portion 48 of the chucking arm 8 is retracted outward from the loading position of the disc master 1, so that in this state the disc is placed on the support pins 2d arranged on the rotary disc 3. Place the master 1. At this time, since the coil spring 2 is inserted in the support pin 2d, the disc master 1 is pushed upward, and the surface of the disc master 1 is positioned above the upper end surface of the flange portion 23b.

Next, from the controller 39 to the solenoid 2
The control signal CS supplied to 7a is turned on, whereby the electromagnetic directional control valve 27 is switched and the pressurized air supply source 2
The pressurized air of No. 8 is supplied to the air chamber 37 through the air supply pipe 26 and the gas passage 26a. At this time, the pressure in the air chamber 37 increases and the piston 22a and the piston rod 22b
Is pushed downward against the return spring 5,
Along with this, the disk 16 is lowered and the chucking arm 8
Is rotated counterclockwise against the return spring 12. Due to the rotation of the chucking arm 8, the contact portion 48 is pressed against the side surface of the disk master 1, and the disk master 1 is sandwiched and held with its upper surface protruding above the upper surface of the flange portion 23b. .

Then, the linear motor device 7 is operated to
The write head 10 is moved to the write start position on the outer peripheral edge side of the disk master 1. Further, the drive source 17 is operated to rotate the spindle 15 and rotate the turntable 3 at a desired number of revolutions while performing a desired cutting. At this time, since the surface of the disk master 1 is located above the upper end surface of the flange portion 23b, even if the gap formed by the write head 10 and the surface of the disk master 1 is narrow,
The write head 10 does not interfere with other members when the write head 10 is moved to the write start position. Therefore, the writing head 10 can be freely moved, and efficient cutting can be performed,
Workability can be improved. Further, since the writing head 10 can be freely moved, it is possible to automate cutting.

After the cutting is completed, the write head 10 is returned to its original position, the control signal CS supplied from the controller 39 to the solenoid 27a is turned off to open the air chamber 37 to the atmosphere, and the return spring 5 causes the piston to move. 22a and piston rod 22b are pushed up. Along with this operation, the disk 16 rises, and in response thereto, the chucking arm 8 is rotated clockwise by the return spring 12 in FIG. 4 to return to the non-contact position, so that the disk master 1 can be taken out. This can be easily performed, and then by mounting a new disc master 1, the same operation as described above can be continued.

In the above embodiment, the pneumatic cylinder 22 is used as the rotating mechanism for rotating the chucking arm 8.
Although the case where the elevating mechanism 9 using is used is described, the present invention is not limited to this, and a ball screw device,
Any lifting mechanism such as an electromagnetic solenoid can be applied. Further, in the above-described embodiment, the elevating mechanism is applied as the rotating mechanism for rotating the chucking arm 8, but the invention is not limited to this. Alternatively, the chucking arm 8 in contact with the inclined cam surface may be rotated between the non-contact position and the contact position by rotating the disk 16 by a motor or the like.

Further, in the above embodiment, the lifting mechanism 9 having a structure in which the pneumatic cylinder 22 is pushed down by the air pressure and the pneumatic cylinder 22 is pushed up by the return spring 5 has been described.
The return spring 5 is inserted between the 2a and the seal member 33, and the gas passage 26a is opened between the closing plate 13 and the piston 22a. The return spring 5 pushes down the pneumatic cylinder 22, and the pneumatic cylinder 22 is pushed by the air pressure. An elevating mechanism having a structure for pushing up may be used.

[0032]

As described above, the disk master cutting device according to the present invention has a support member for supporting the bottom surface of the disk master and an abutting portion at one free end facing the disk master. A plurality of rotating arms whose other ends extend along the lower surface of the disk master, a non-contact position in which the rotating arms are separated from the disk master by engaging the other ends of the rotating arms, and the disk master. Since the disk master is clamped and held by a holding device having a rotation mechanism that rotates between the disk master and the abutting position, the surface of the disk master is equivalent to the upper surface of the rotary disk or the holding device. It can be held at a higher position. Therefore, even if the gap formed by the surface of the disk master and the write head is narrow, it is possible to reliably prevent the write head from interfering with other members. As a result, the write head can be moved freely, cutting efficiency can be improved, and automation can be facilitated.

Further, since the rotating arm releases the sandwiching of the disk master by the outward rotation, the disk master can be easily taken out to the outside when the cutting is completed, and the workability is improved. Can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a disc master cutting device according to the present invention.

FIG. 2 is a partial cross-sectional view of the disc master cutting device shown in FIG.

3 is a partial cross-sectional view of the disc master cutting device shown in FIG. 1. FIG.

FIG. 4 is a partially enlarged view of FIG.

FIG. 5 is a plan view showing a part of a conventional disc master cutting device.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is an overall configuration diagram showing a conventional disc master cutting device.

FIG. 8 is a plan view showing a part of a conventional disc master cutting device.

[Explanation of symbols]

 1 disc master 2 coil spring 3 rotating disc 4 disc master pressing 5 return spring 6 housing 7 linear motor device 8 chucking arm 9 lifting mechanism 10 writing head 12 return spring 15 spindle 16 disc 17 drive source 20 disc master rotating device 21 writing device 32 Retention mechanism

Claims (1)

[Claims] 1. A rotary disk driven and rotated by a drive unit, a holding device for detachably holding a disk master mounted on the upper surface of the rotary disk, and a disk master surface held on the rotary disk. In the device for cutting a disc master including a writing head, the holding device has a support member for supporting the bottom surface of the disc master, and a free end at one end having an abutting portion facing the disc master, and the other end. Is engaged with the rotating arm extending along the lower surface of the disc master and the other end of the rotating arm so that the rotating arm is located at a non-contact position separated from the disc master and a side surface of the disc master. A disc master cutting device, comprising: a rotating mechanism that rotates between contacted positions.