JPH0574131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording medium testing device. More specifically, the present invention relates to a test device that can test a disk recording medium such as a magnetic disk or an optical disk in a short time.

[Prior Art] With the recent rapid expansion of OA and the remarkable progress of reproduction technology in recent years, disk recording media such as magnetic disks or optical disks have come into widespread use. Such disks tend to be smaller. In particular, 5
Small floppy disks of 1/4 inch and even smaller 3.5 inches called microfloppy disks are rapidly becoming popular in offices and households. As a result, their production has increased rapidly in recent years.

[Problems to be Solved by the Invention] After a disk recording medium is produced, it must be inspected to determine whether it passes or fails based on predetermined electrical specifications. The mechanical structure of a typical disk testing device is one spindle, one head, and one head carriage. Testing takes a long time because the entire disk is tested in one head. Therefore,
In particular, for small disks of 5 1/4 inches or less, such conventional inspection methods have a slow processing speed and may not be able to handle them.

As a result, in order to deal with this, it may be possible to install two or three more inspection devices, but the more inspection devices are added, the more space is taken up and the manufacturing cost increases. , the relationship with other stages of the production line becomes complicated. Moreover, it creates an unfavorable environment for a disk production line where dust and the like are avoided as much as possible. On the other hand, the smaller the size of such an inspection device, the more preferable it is in relation to the production line.

In order to shorten this test time, the following test method has been proposed. (i) 2-carriage, 2-head method as shown in Figure 2a: The disadvantage of this method is that since two carriages are used, the device becomes large and the manufacturing cost becomes too high; (ii) A method of attaching two heads in series to one carriage as shown in Fig. 2b: The drawback of this method is that as the disk diameter becomes smaller, the heads will interfere with each other dimensionally; A method of mounting two heads in parallel on one carriage as shown in FIG.

[Object of the Invention] Therefore, an object of the present invention is to provide a recording medium testing device that overcomes the drawbacks of the conventional devices and testing methods as described above.

[Means for Solving the Problem] In order to solve this problem, the present invention includes a carriage that is movable in the horizontal direction, a plurality of heads fixed on the carriage, and a disk recording medium that connects the heads. The heads are fixed on the carriage in a positional relationship facing each other, and one head is a loading mechanism for the outer periphery that moves from the outer periphery to the inner periphery of the disk recording medium. The present invention provides a recording medium testing device characterized in that the other head is an inner circumferential head that moves from the inner circumferential edge to the outer circumferential edge of the disk recording medium.

[Function] As described above, since the recording medium testing device of the present invention uses only one carriage and one spindle, the entire device can be downsized and the manufacturing cost can be kept low.

In the recording medium testing device of the present invention, a plurality of heads are fixed on the carriage in a positional relationship facing each other, and one head is an outer head that moves from the outer edge of the disk recording medium toward the inner edge. The other head functions as an inner circumferential head that moves from the inner circumferential edge to the outer circumferential edge of the disk recording medium. Therefore, problems such as head azimuth, which occur with conventional devices with two heads in parallel, do not occur.

Furthermore, in the recording medium testing device of the present invention,
The outer and inner heads each take charge of a plurality of tracks of the disk recording medium by dividing them into the outer and inner sides, and the outer and inner heads move simultaneously. As a result, testing time is cut in half. Furthermore, if each head scans some tracks of the disk recording medium overlappingly, the inspection accuracy can be further improved.

The recording medium testing device of the present invention has a wide range of applications. For example, if the recording medium is a magnetic disk,
By using a magnetic head for this head, and on the other hand, when the recording medium is an optical disk, using an optical head for this head, it can be applied to any application. Other uses will be apparent to those skilled in the art.

[Embodiments] Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a conceptual diagram of a recording medium testing device of the present invention.

As shown in FIG. 1, the recording medium inspection apparatus of the present invention includes a disk spindle 1 that is movable in the vertical direction, a carriage 3 that is movable in the left and right directions on a moving shaft 11, and a disk that is fixed on the carriage. A plurality of heads 5a and 5b and a disk 7
It consists of a head loading mechanism 9 for loading onto the head.

The spindle movement axis has repeatability of the disk test position.

The heads 5a and 5b are fixed on the carriage 3 in a positional relationship facing each other.
A is a head for the outer circumference of the disk 7 that moves from the outer circumference toward the inner circumference, and a head 5b is a head for the inner circumference that moves from the inner circumference of the disk 7 toward the outer circumference. The head 5a for the outer circumference and the head 5b for the inner circumference each handle a plurality of tracks of the disk 7 by dividing them into the outer circumference side and the inner circumference side, and the outer circumference head and the inner circumference head move simultaneously. do. Preferably, each head scans some tracks of the disk redundantly. This allows mutual correction of information read out between a plurality of heads. When the recording medium is a magnetic disk, a magnetic head is used as the head, whereas when the recording medium is an optical disk, an optical head is used as the head.

Each head is fixed via head movement shafts 6a and 6b within the carriage 3, and by adjusting the position of these movement axes, each head can be accurately positioned on a specified radius.

Next, the operation of the recording medium testing apparatus of the present invention will be explained.

A known handling mechanism (not shown) from the recording medium supply pallet (not shown)
The medium to be tested (disk) is transferred to the disk attachment/detachment position. At this disk attachment/detachment position, the disk is attached to the spindle 1, and then moved on the spindle movement axis to the test position and fixed. As shown in FIG. 1, when the spindle 1 is installed horizontally, it moves back and forth, and when it is installed vertically, it moves up and down.

Once the disk is secured in the test position, the head loading mechanism 9 is actuated to bring the head into contact with the disk. Next, the carriage 3 sequentially moves to the right on the carriage movement axis 11, so that
The head 5a for the outer periphery scans the disk surface from the outer periphery of the disk toward the inner periphery, and at the same time, the head 5b for the inner periphery scans the disk surface from the inner periphery of the disk toward the outer periphery. After the test is completed, the head loading mechanism is activated to unload the heads on the disk surface. Then, the carriage moves in the same direction on the carriage movement axis and moves in the opposite direction relative to the circumferential surface of the disk 7 with its center as a reference, so that the head returns to its original position.

The spindle then moves the disk in the test position to the loading/unloading position, where it is removed. Depending on the test results, the removed disk will be
The media are sorted into pass, top-side rejection, bottom-side rejection, and both-side rejection and transported to respective recording medium storage pallets (not shown).

The apparatus of the present invention can be used as a disk glide tester if two heads are used for glide and check, respectively, and arranged so that the entire disk surface can be sought alone.

[Effects of the Invention] As explained above, since the recording medium testing device of the present invention uses only one carriage and one spindle, the entire device can be downsized and the manufacturing cost can be kept low. can.

In the recording medium testing device of the present invention, a plurality of heads are fixed on the carriage in a positional relationship facing each other, and one head is an outer head that moves from the outer edge of the disk recording medium toward the inner edge. The other head functions as an inner-circumference head that moves from the inner circumferential edge to the outer circumferential edge of the disk recording medium. Therefore, problems such as head azimuth, which occur with conventional devices with two heads in parallel, do not occur.

Furthermore, in the recording medium testing device of the present invention,
The outer and inner heads each take charge of a plurality of tracks of the disk recording medium by dividing them into the outer and inner sides, and the outer and inner heads move simultaneously. As a result, testing time is cut in half. Furthermore, if each head scans some tracks of the disk recording medium overlappingly, the inspection accuracy can be further improved.

The recording medium testing device of the present invention has a wide range of applications. For example, if the recording medium is a magnetic disk,
By using a magnetic head for this head, and on the other hand, when the recording medium is an optical disk, using an optical head for this head, it can be applied to any application. Other uses will be apparent to those skilled in the art. For example, if two heads are used, one for glide and one for check, and arranged so that the entire disk surface can be sought alone, it can be used as a disk glide tester.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a recording medium testing device of the present invention, and FIG. 2 is a conceptual diagram of a testing method using a conventional two-head type device. DESCRIPTION OF SYMBOLS 1... Spindle, 3... Carriage, 5a and 5b... Head, 7... Disk, 9... Head loading mechanism, 11... Carriage movement axis.

Claims (1)

[Scope of Claims] 1. Consisting of a linearly movable carriage, a plurality of heads fixed on the carriage, and a loading mechanism for loading the heads onto a disk recording medium, the head is connected to the carriage. One head is an outer head that moves from the outer edge of the disk recording medium toward the inner edge, and the other head moves outward from the inner edge of the disk recording medium. The head for the inner circumference moves toward the periphery, and the head for the outer circumference and the head for the inner circumference divide the plurality of tracks of the recording medium into the outer circumference side and the inner circumference side, respectively. 1. A recording medium testing device characterized in that a peripheral head and an inner peripheral head move simultaneously. 2. The recording medium testing apparatus according to claim 1, wherein each head scans some tracks of the disk recording medium in duplicate.