JPH02173954A - Inspecting device for optical information storage medium - Google Patents

Abstract

PURPOSE:To easily prevent the medium from warpage to accurately inspect optical information storage mediums different in classification or size by separatably connecting a driving shaft body and a supporting body and attracting the optical information storage medium by vacuum through aperture parts of flow passages formed in the peripheral edge part on the upper face side of the supporting body. CONSTITUTION:Aperture parts of flow passages 11 and 16 of air or the like through which the optical information storage medium is attracted by vacuum are formed in the peripheral edge part on the upper face side of a supporting body 15, on which the optical information storage medium is placed, to attract the optical information storage medium closely to the supporting body 15, thereby preventing this medium from warpage. Since a driving shaft body 4 and the supporting body 15 can be separated from each other, only the supporting body 15 is replaced in accordance with the classification or the size of the optical information storage medium, and the optical information storage medium is prevented from being deformed and is surely attracted and is accurately inspected.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an optical information storage medium inspection device that optically measures the physical characteristics of an optical information storage medium, and particularly relates to an optical information storage medium inspection device that optically measures the physical characteristics of an optical information storage medium. The present invention relates to the structure of a rotating means for holding and rotating an optical information storage medium.

(Prior Art) In recent years, optical disks have been widely used as one of the information storage media for image information storage and retrieval devices, playback devices for reproducing audio and video, and image information storage and retrieval devices for processing image information. It has become. This optical disk stores and reproduces information by irradiating a laser beam onto a storage surface on which information is stored, and has a large amount of information storage per unit area, making it the largest capacity information storage medium.

On the other hand, at the final stage of the manufacturing process, this optical disc undergoes various quality inspections in accordance with standards, such as inspections for physical characteristics such as surface runout and warpage. It is configured as shown in the figure. In the figure, an optical disk 1, which is an optical information storage medium of an object to be inspected, has a predetermined size, for example, a disc shape with a diameter of 130vn, and a spindle shaft 4, which is the rotation axis of a spindle motor 3 fixed on a base 2. It is placed on the upper end of the turntable 5 via a turntable portion 5 which is a support plate. Further, an optical head 8 is mounted on a movable table 7 which is provided on the base 2 so as to be movable in the horizontal direction via a guide section 6. This optical head 8 performs focus servo control to maintain a constant distance from the storage surface of the optical disk 1, and tracking servo control to control the operation to follow the eccentricity of the track formed on the storage surface. configured to do so. Then, the focus servo control signal and track servo control signal from this optical head 8 are taken out,
The physical characteristics of the optical disc 1 are inspected.

Further, the above spindle shaft 4 and U-turntable section 5 have conventionally been constructed as shown in FIGS. 8 and 9. That is, a bottomed cylindrical turntable part 5 is concentrically fixed to the upper end of the spindle shaft 4 by a plurality of screws 9, and a central shaft 10 is concentrically fixed to the upper end of the spindle shaft 4. It is formed and protrudes into the turntable section 5.

Further, an air passage 11 is formed in the center of the spindle shaft 4 in parallel to the axial direction, and the lower end of this air passage 1'1 is connected to a vacuum pump (not shown). The upper end of this air passage 11 is branched into a plurality of parts, for example four parts, and is connected to an opening 12 formed around the central axis 10 at the bottom of the turntable part 5. The optical disc 1 placed on the turntable section 5 and positioned by the central axis 10 is moved to the turntable section 5 by evacuating the air in the recess 5a of the turntable section 5 through the air passage 11 to create a vacuum. is vacuum-adsorbed and fixed onto the turntable section 5.

(Problems to be Solved by the Invention) The conventional optical information recorder configured as described above! ! According to the medium inspection device, the optical disc 1, which is an optical information storage medium, has a turntable 5 with an appropriate diameter as shown in FIG. 10, and has a sandwich-inch structure in which two optical discs are placed back to back. In the case of the laminated plate 13, since the optical disk has rigidity, the occurrence of warping during vacuum suction can be relatively reduced. However, when the optical disk is a single plate 14 consisting of only one piece as shown in FIG. 11, the rigidity of the optical disk is low, and the central part is attracted, causing a large warpage, which makes it impossible to perform correct inspection. There was a problem. There was also a tendency that the larger the size of the optical disc 1, the more warping occurred.

In order to solve this conventional problem, conventionally the optical disc 1
If the type or size of the turntable section 5 is different,
The spindle shaft 4, which is integrated with the main body, and the fixing jig for attaching these parts have to be replaced. For this reason, these positions must be adjusted each time they are replaced, which is inconvenient and time-consuming.

The present invention has been made in view of the above circumstances, and provides an optical information storage medium that easily prevents warpage and allows accurate inspection even if the types and sizes of optical information storage media are different. Aims to provide media inspection [1].

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for placing an optical information storage medium as an object to be examined and vacuum adsorbing the optical information storage medium. a support body having an opening for a flow passage provided on the upper surface side peripheral edge; and a flow passage that is removably fixed to the support body and is rotatably driven and connected to the flow passage of the support body in a freely conductive manner. The optical information storage medium is characterized by comprising a drive shaft body made of a metal material, and a vacuum source that evacuates the inside of the flow path of the drive shaft body and the support body to vacuum adsorb the optical information storage medium.

(Function) In the optical information storage medium inspection apparatus of the present invention, air or the like is applied to the upper peripheral edge of the support on which the optical information storage medium is placed to vacuum adsorb the optical information storage medium. By forming the opening of the flow path, the optical information storage medium is closely adsorbed to the support, and warping can be prevented. Furthermore, by making the drive shaft body and the support body separable, only the support body can be replaced according to the type and size of the optical information storage medium, thereby preventing the occurrence of deformation of the optical information storage medium. This allows for reliable adsorption and accurate inspection.

(Embodiment) Hereinafter, one embodiment of the optical information storage medium inspection apparatus according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 3.

In addition, in the figures, the same or equivalent parts as in the conventional example shown in FIGS. 8 and 9 are denoted by the same reference numerals, and detailed explanations thereof will be omitted. A central shaft 10 is formed concentrically and integrally protruding from the upper end of a spindle shaft 4 that is a rotation shaft of a spindle motor (not shown). Further, an air passage 11 is formed in the center of this spindle shaft 4 in parallel to the axial direction.
The lower end of this air passage 11 is connected to a vacuum pump (not shown). The upper end of this air passage 11 is branched into a plurality of, for example four, branches, each of which opens around the central axis 10 on the upper end surface of the spindle shaft 4. The above configuration is the same as that of the conventional example.

On the other hand, the turntable 15, which serves as a support for mounting and fixing an optical disk as an optical information storage medium, is formed into a substantially cylindrical shape with a bottom, and a hole 15b is formed in the center of the bottom 15a of the turntable 15. The central shaft 10 formed at the upper end of the spindle @4 is fitted into this hole 15b. This fitting is a fit with precise tolerances, and the turntable portion 15 is accurately positioned with respect to the spindle shaft 4.

The turntable section 15 attached to the upper end surface of the spindle shaft 4 in this manner is removably fixed by a plurality of screws 9, for example, four screws. Further, the spindle shaft 4 is provided on the lower surface side of the bottom portion 15a of the turntable portion 15.
The lower ends of four air passages 16 formed in the bottom 15a and side wall 15c of the turntable section 15 are opened at positions that align with the four openings of the air passage 11 formed in the upper end surface. . Roughly speaking, the upper ends of these four air passages 16 open to the upper end surface (optical disc mounting surface) 15d of the side wall 15c of the turntable section 15, and these openings have circular shapes on the mounting surface 15d. It communicates with a groove 17 formed in.

Next, the operation of this embodiment will be explained.

FIG. 4 shows a case where an optical disc 18 having a diameter of 130 mm and having a hub 18a at the center is fixed on the turntable section 15. When the optical disc 18 is placed on the turntable section 15, the optical disc 18 is positioned by fitting the central shaft 10 of the spindle shaft 4 into the central hole of the hub 18a. Therefore, the center positioning accuracy of the optical disc 18 is
It is determined by the fitting accuracy due to the respective tolerances between the outer diameter of the hub 18a and the inner diameter of the center hole of the hub 18a. Also hub 18
a is fitted into the inner diameter of the turntable portion 15, and the optical disc 18 is placed on the placement surface 15d. Next, the pulp (not shown) is opened and the air in the air passages 11, 16 is evacuated by a vacuum pump (also not shown) to create a substantially vacuum.

This result li! Optical disc 1 placed on placement surface 15d
8 is vacuum-adsorbed at the position of the groove portion 17 and is securely fixed to the turntable portion 15. Therefore, the optical disc 18
Even if the rigidity is small because it is a single plate, the mounting surface 15
d1. : Since it is tightly attached and fixed by suction, no warping occurs. Furthermore, even if the optical disc 18 is made of a laminated plate and has high rigidity, the occurrence of deformation such as warping can be further reduced. Note that the optical f-isk 18 can be easily attached to and detached from the turn dimple portion 15 by opening and closing a valve provided in the piping of the vacuum pump.

FIG. 5 shows a case where an optical disk 19 having a diameter of 86 mm and having a hub 19a at the center is fixed. In this case, the turntable section attached to the spindle shaft 4 can be replaced with a turntable section 20 having a smaller outer diameter, and the optical disc can be efficiently
9 can be fixed to the turntable section 20 by suction.

FIG. 6 shows a case where an optical disk 21 having a diameter of 13 oIlll without a hub in the center is fixed. In this case, the turntable section attached to the spindle shaft 4 is replaced with a turntable section 22 having a larger outer diameter, and this turntable section 22
The outer diameter of the central axis 23 provided at the center of the optical disc 21
The inner diameter of the center hole is set equal to the inner diameter of the center hole, and the positioning is performed based on the fit accuracy based on the respective tolerances.

The turntable sections 20 and 22 shown in FIGS. 5 and 6 are similar in structure to the turntable section 15 shown in FIG. 4, and are detachable and replaceable with respect to the spindle shaft 4. In addition, these turntable parts 2
Optical disks 19.21 each mounted on 0.22
Whether it is a single plate or a laminated plate, it is possible to prevent the occurrence of warpage and securely fix the plate by suction.

According to this embodiment, depending on the type and size of the optical disc, only the turntable part is replaced and attached to the spindle shaft 4, and the optical disc is vacuum-adsorbed to the mounting surface of the turntable part, thereby preventing the optical disc from warping. It is possible to prevent this from occurring and ensure secure fixation to the turntable section.

Then, the optical disc can be inspected correctly.

In the above embodiment, the spindle shaft 4 and the U-turntable parts 13, 18, 20 each have four air passages branched from each other, and the number of screws 9 for fixing them is four. Needless to say, the number is not limited to four. Also, the outer diameter of the optical disc is 130mm+
and 861I1m. Furthermore, the groove portion 17 formed on the If surface of the turntable portion may be omitted.

[Effects of the Invention] As explained above, according to the present invention, the drive shaft and the support provided in the optical information storage medium inspection device are separably connected, and the optical information storage medium is connected to the support. Vacuum suction is performed through the opening of the flow path formed on the upper periphery, so even if the type or size of the optical information storage medium is different, it can be reliably suctioned by simply replacing the support. It can be fixed and correct inspection can be performed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a rotating means according to an embodiment of the optical information storage medium inspection apparatus according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an exploded longitudinal sectional view of FIG. 1. 4, 5 and 6 are front views and 7th views respectively showing examples of attaching different optical information storage media to rotating means according to the present embodiment.
8 is a longitudinal sectional view showing a conventional rotating means, FIG. 9 is a plan view of FIG. 8, and FIGS. 10 and 11 are respectively conventional FIG. 3 is a longitudinal cross-sectional view showing an example of how an optical information storage medium is attached to a rotating means. 1.13.14, 18.19.21... Optical disk, 4... Spindle shaft, 5.15, 20.22... Turntable section, 11.
16... Air passage, 17... Groove.

Claims (1)

[Claims] In addition to placing an optical information storage medium as a subject,
A support body having an opening of a flow path for vacuum adsorbing the optical information storage medium on its upper surface side peripheral edge; and a support body which is detachably fixed and is rotatably driven, and the flow path of the support body is The drive shaft body has a flow path that is electrically connected to the drive shaft body, and a vacuum source that vacuums the flow path of the drive shaft body and the support body and sucks the optical information storage medium under vacuum. An optical information storage medium inspection device characterized by: