JPH01286188A - Manufacture of disk shape recording medium - Google Patents

Abstract

PURPOSE:To prevent a plate spring from coming off in performing an assembling process before completing the assembling of a center core and to release connection between the plate spring and a slit after completing manufacturing by connecting the plate spring to a core block with an adhesive in performing the manufacturing process of a disk shape recording medium. CONSTITUTION:A magnetic recording disk 12 on which still picture information, etc., is recorded is housed rotatably freely in the inside of a hard case constituted in square shape in a magnetic recording cartridge 10, and the center core 14 as a reinforcing member is provided in the center part of the disk 12, and the core 14 is exposed from the aperture part 18 of the cartridge 10 to the outside. Also, a window part 18 where a magnetic head is positioned is opened at the cartridge 10, and a metallic core plate 30 is used in a part of the core 14, and the core block 32 made of resin is mounted in the center part of the plate 30, and the plate spring 34 is arranged at the block 32. A prescribed position is formed by inserting the plate spring 34 between the projection 38A and the projection 38B of the slit 38, and the plate spring 34 is stuck and connected to the projection 38B with an ultraviolet non-blocking adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for manufacturing a disk-shaped recording medium, and in particular to a method for manufacturing a disk-shaped recording medium, in particular a method for recording still image information or reproducing recorded image information by a magnetic, optical, or magneto-optical recording and reproducing device. The present invention relates to a method of manufacturing a disc-shaped recording medium.

[Conventional technology]

Recently, imaging devices such as solid-state image sensors and image pickup tubes have been combined with recording devices that use magnetic disks, which are inexpensive and have a relatively large storage capacity, to electronically take still photographs of subjects and record them on rotating magnetic disks. Electronic still camera systems have been developed and are attracting attention, in which images are recorded and played back using a separate television system or printer.

The magnetic disks used in such systems are used in the form of magnetic recording cartridges. A magnetic recording cartridge rotatably houses a magnetic disk for magnetically recording still image information, etc., and this magnetic recording cartridge can be used as a magnetic recording device built into an electronic camera or a playback device that is integrated with or separate from the magnetic recording device. It is installed and used. When installing a magnetic recording cartridge into a magnetic recording device or reproducing device in an electronic camera, connect the center hole provided in the center core of the magnetic disk in the magnetic recording cartridge directly to the rotational drive shaft of the magnetic recording or reproducing device. Mounting the magnetic recording cartridge is troublesome and inconvenient, and there is a possibility that the magnetic recording cartridge cannot be correctly mounted in the magnetic recording or reproducing apparatus.

In order to eliminate such troubles, a magnetic recording cartridge attachment/detachment device has been proposed in the past. , a packet formed integrally with the top lid, or pivotally supported on the main body or the top lid, and by inserting a magnetic recording cartridge into this packet and then closing the top lid, the magnetic recording car in the packet can be removed. The magnetic disk of the cartridge is attached to the rotational drive shaft of the main body of the device. A center core is provided at the center of the magnetic disk, and the rotation drive shaft is fitted into the center hole of the center core to rotate the magnetic disk within the magnetic recording cartridge.

By the way, the center core of a magnetic disk needs to be accurately attached to the rotation drive shaft, and if this attachment is insufficient, the magnetic disk will cause eccentric rotation or uneven rotation, making it difficult for the magnetic head to accurately record signals on the magnetic disk. Not only is there a risk that the data will not be reproduced, but there is also a risk that the magnetic disk, magnetic head, etc. will be adversely affected. For this reason, in the center core of a conventional magnetic disk, an elastic piece made of resin is formed in the center hole into which the drive shaft is inserted, and the center core is pressed against the drive shaft side with a predetermined pressing force. to ensure accurate attachment to the drive shaft.

However, elastic pieces made of resin have low durability and heat resistance, and may be subject to deformation over time, causing misalignment of the magnetic disk and eccentric rotation of the magnetic disk. In order to solve this problem, in Utility Model Application Publication No. 59-138063,
A center core using a metal leaf spring instead of a resin elastic piece has been proposed. This metal leaf spring supports both ends of the leaf spring in a slit in the center hole of the center core into which the rotary drive shaft of the magnetic recording/reproducing device is inserted, and the leaf spring supports the rotary drive shaft inserted into the center hole. It is characterized by being biased and pressed against the opposing surface.

[Problem that the invention seeks to solve]

However, since this metal leaf spring is simply disposed within a slit formed in the center hole of the center core, it has the disadvantage that even slight vibrations during the assembly process can cause the leaf spring to come off.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for manufacturing a disk-shaped recording medium in which the leaf spring does not come off during the assembly process before the center core is assembled.

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for chafing a magnetic disk onto a rotational drive shaft of a magnetic recording/reproducing device.
A core block having a center hole that can be fitted into the rotational drive shaft is formed, a metal plate spring is inserted into this core block,
After that, in a method of manufacturing a disk-shaped recording medium by covering both ends of the leaf spring with an upper core, the portion of the leaf spring that avoids the fulcrum is temporarily fixed to the core block with adhesive, and at least during the manufacturing process, the leaf spring is It is characterized by preventing it from falling off from the core block.

[Effect]

According to the present invention, the leaf spring can be temporarily fixed to the core block with an adhesive during the manufacturing process, and the temporary joint between the leaf spring and the slit can be released after the manufacturing is completed.

〔Example〕

Preferred embodiments of the method for manufacturing a disk-shaped recording medium according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 5 shows a plan view of the magnetic recording cartridge in which the magnetic recording cartridge is housed, and FIG.
It is a sectional view along the Δ line. ′! As shown in Figure R5, the hard case of the magnetic recording cartridge 10 has a substantially rectangular shape, and a magnetic disk 12 on which still image information and the like are recorded is rotatably housed inside the hard case. A center core 14 as a reinforcing member is provided in the center of the magnetic recording disk 12, and the center core 14 is exposed to the outside through an opening 16 in the shape of a 100-circle magnetic recording cartridge.

A window 18 in which a magnetic head, which will be described later, is located is opened in the magnetic recording cartridge 10, and this window 18 for the magnetic head is opened and closed by a slideable shutter 20. That is, the shutter 20 closes the window 18 to prevent dust from adhering to the magnetic recording disk 12 before the magnetic recording cartridge 10 is inserted into a packet to be described later, and when the magnetic recording cartridge 10 is inserted into the packet, the shutter 20 closes the window 18 to prevent dust from adhering to the magnetic recording disk 12. The head window fl'[s18 is moved downward in the figure to open the head window fl'[s18, and recording and reproduction on the magnetic recording disk 12 becomes possible.

Further, as shown in FIG. 6, by using a metal core plate 30 as a part of the center core 14 and arranging a magnet on the receiving surface 22A of the rotary drive shaft 22, the rotary drive shaft 22 can be attached to the center hole 15. can be inserted securely.

As shown in FIGS. 1A and 1B, the core plate 30 is formed into a disk shape, and a core block 32 made of resin is attached to the center thereof.

The core block 32 has a center hole 15;
Tapered surfaces 15B, 15B are formed on the inner peripheral surface 15A. The core block 32 also has a slit 38.
38 is formed, and a spring support protrusion 38A and an adhesive protrusion 38B are formed on the opposing surface of the slit 38. A leaf spring 34 is disposed between the protrusion 38A and the protrusion 38B.

Further, a ring-shaped rib 33 made of resin is fixed to the lower surface of the core plate 30.

As shown in FIGS. 2(A) and 2(B), the leaf spring 34 has convex portions 34A, 34A formed at both ends, and a bend a at the center of the lower end.
'1s34B is formed.

The manufacturing process of the method for manufacturing a disk-shaped recording medium according to the present invention configured as described above will be explained.

First, as shown in FIG. 3(A), the leaf spring 34 is inserted between the protrusion 38A and the protrusion 38B of the slit 38.
The leaf spring 34 is arranged at the position shown in Figure (B). Next, as shown in FIGS. 5(C) and 5(D), the protrusion 38B and the leaf spring 3 are
4 and are glued together using a UV non-tackifying adhesive. This results in
The leaf spring 34 does not come off from the core block 32 due to slight vibrations during the assembly process. Next, in a dosing process, as shown in FIG. 4, the magnetic disk portion 128 is attached to the center core 14, and then the upper core 40 is attached to complete the assembly of the magnetic disk 12. Finally, the magnetic disk is irradiated with ultraviolet rays to make the adhesive non-adhesive, and the protrusion 38B and leaf spring 3
Release the adhesive with 4.

In this way, according to the present invention, the leaf spring 34 has the slit 3
The magnetic disk 12 can be assembled while being adhered to the protrusion 38B of No. 8, and after the assembly is completed, the adhesion of the leaf spring 34 can be released to keep the spring pressure constant.

In the above embodiment, an ultraviolet non-stick adhesive that becomes non-adhesive when exposed to ultraviolet rays is used as the adhesive, but the adhesive is not limited to this, and may become non-adhesive due to changes in temperature, humidity, changes over time, or irradiation with light. A similar effect can be obtained by using an adhesive. Alternatively, an adhesive having relatively low peel strength may be used so that the adhesive surface is peeled off when the rotational drive shaft 22 is inserted for the first time after assembly is completed.

〔Effect of the invention〕

As explained above, according to the method for manufacturing a disk-shaped recording medium according to the present invention, the leaf spring can be temporarily fixed to the core block, thereby preventing the leaf spring from coming off from the core block during the manufacturing process. After manufacturing is completed, the temporary fixing of the leaf spring can be released. In addition, by using the part where the adhesive is not attached as a support point,
Since the spring pressure can be kept constant, deterioration of the chucking condition can be prevented.

[Brief explanation of the drawing]

FIG. 1(A) is a plan view of a magnetic recording cartridge according to the present invention, FIG. 1(B) is a sectional view taken along the line AA in FIG. 1, and FIG.
A) and (B) are top and front views respectively showing the leaf spring of the magnetic recording cartridge according to the present invention, and FIGS. 3(A) to (D) and FIG. FIG. 5 is a cross-sectional view showing the assembly process, and FIG. 5 is a plan view of the magnetic recording cartridge (IJ) in which the magnetic recording cartridge according to the present invention is housed. FIG. 6 is a cross-sectional view taken along the line A--A in FIG. 10... Magnetic recording cartridge, 12... Magnetic disk, 14... Center core, 15... Center hole,
15A...Inner peripheral surface, 22...Rotation drive shaft, 34
...Plate spring. (A) 10.--Magnetic recording force--Tridge 12--Magnetic disk 14--Center core 15--Center hole 15A--Inner circumferential surface 22-One rotation drive shaft 34-Plate h (B) Fig. 1 ( B) 4B Figure 3

Claims (1)

[Scope of Claims] In order to chuck the disk to the rotation drive shaft of a recording/reproducing device, a core block is formed that has a center hole that can be fitted into the rotation drive shaft, and a metal plate spring is inserted into this core block. Then, in the method of manufacturing a disk-shaped recording medium by covering both ends of the leaf spring with an upper core, the part of the leaf spring that avoids the fulcrum is temporarily fixed to the core block with adhesive, and at least during the manufacturing process. A method for manufacturing a disk-shaped recording medium, characterized in that a leaf spring is prevented from falling off a core block.