JPH0330165A - How to assemble a disc cartridge - Google Patents

Abstract

PURPOSE:To attain simple and quick assembling by overlapping both upper and lower halves so that the tip of a projection at a coupling position is brought into contact with the butting face of other half and coupling them with ultrasonic wave welding. CONSTITUTION:Both upper and lower halves 2,3 are overlapped so that the tip of a projection 13 formed on a coupling part is brought into contact with the butting face 11a of other half, and ultrasonic wave is applied to the projection to couple both the upper and lower halves 2,3. In the operation of an ultrasonic wave welding machine, ultrasonic wave vibration is transmitted to a conical projection 13 from an exponential horn 15 and the conical projection 13 is heated, molten and welded. Thus, the screw tightening by a fixed screw is not required and the assembling of the disk cartridge is implemented easily and quickly and no crack is generated in the disk cartridge at the assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for assembling a disk cartridge for accommodating a disk as a recording medium such as an optical disk or a magnetic disk.

[Conventional technology]

Generally, a recording medium such as an optical disk or a magnetic disk is housed in a plastic disk cartridge. This disk cartridge consists of an upper half piece and a lower half piece, which are stacked and connected to each other so that the disk is sandwiched between them. When the two halves are overlapped, a protrusion is made to protrude from each half, these protrusions are aligned, and a bolt is inserted thereto to fix the two halves.

[Problem to be solved by the invention]

However, the conventional method of assembling a disk cartridge is
Since the fixing protrusions from both halves were simply aligned and the bolts were passed through them, there was a risk of cracks occurring at the screw tightening points on both halves, and the bolts were also relatively small, making the screw tightening operation cumbersome. However, it has the disadvantage that it takes time and effort to assemble.

[Means to solve the problem]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for assembling a disk cartridge, in which an upper half piece and a lower half piece are combined, and the upper and lower halves are joined together at a joining point set at an appropriate position on both the upper and lower halves. A plurality of locations on the abutting surfaces of the circumferential wall of the half piece and the circumferential wall of the lower half piece are set as the coupling locations, a protrusion is formed on either of the upper and lower halves at the coupling location, and a tip of the protrusion is formed. After the upper and lower halves are placed on top of each other so that the two halves are in contact with the abutting surface of the other half, ultrasonic welding is performed on the protrusion to connect the upper and lower halves.

〔Example〕

Hereinafter, an embodiment of a method for assembling a disk cartridge according to the present invention will be described with reference to the drawings.

First, the finished product of the disk cartridge will be explained based on FIGS. 3 to 5.

The disk cartridge (2) has an upper half piece 2 and a lower half piece 3 combined therewith. A turntable insertion hole 4 into which a turntable is inserted is formed in the center of the disk cartridge ↓, and a head insertion hole 5 is provided adjacent to this turntable insertion hole 4. Both upper and lower halves 2.3 are made of polycarbonate resin or ABS resin.

These turntable insertion holes 4 and head insertion holes 5 are
It can be opened and closed by a shutter 6.

This shutter 6 is biased by a spring 7. The lower part of the shutter 6 is guided by a guide plate 8, and a double write prevention device 9.9 is provided below the guide plate 8.
is provided.

The upper and lower halves 2.3 have butt surfaces 10a. lla
They are joined by welding at joining points J set over multiple locations.

Further, in FIG. 2, reference numeral 12 indicates positioning portions for both the upper and lower half pieces 2 and 3 provided at multiple locations within the disk cartridge, and the positioning portions 12 include insertion protrusions 12a provided on the upper half piece 2 side, It consists of a receiving protrusion 12c having a hole 12b for inserting the insertion protrusion 12a provided on the lower half piece 3 side. When assembling the upper and lower halves 2.3, accurate alignment is achieved by inserting the insertion projection 12a into the hole 12b of the receiving projection 12c.

Next, a method of assembling the disk cartridge 1 will be explained.

Abutment surface 1 of the peripheral walls 10.11 of the upper and lower halves 2 and 3
Mutual joining points J are set at several locations on 0a and lla, and as shown in FIG. A conical projection 13 is formed that projects toward the surface 11a. In the illustrated example, the conical projection 13 is formed into a conical shape to facilitate melting during welding. However, it may be in the shape of a pyramid, or it may be in the shape of a frustum with the tip slightly cut off. On the other hand, the abutting surface 11a of the peripheral wall 11 of the lower half piece 3 is formed flat over the entire circumference.

Note that the conical projection 13 may be provided on the lower half piece 3.

The upper and lower halves 2.3 formed as described above are overlapped, and the upper and lower halves 2.3 are partially inserted into the holes 12b of the receiving protrusions 12c of the positioning part 12 as shown in FIG. Perform alignment.

In this state, the tip of the conical projection 13 contacts the abutting surface 11a of the lower half piece 3.

Next, apply an ultrasonic welder to sandwich the contact area. That is, in FIG. 1, the reference numeral 14 indicates a magnetostrictive oscillator that converts the high frequency from a high frequency oscillator (not shown) into longitudinal vibration, and the reference numeral 15 indicates a magnetostrictive oscillator that converts the longitudinal vibration into longitudinal vibration between the conical protrusion 13 and the abutment surface ↓1a. An exponential horn is shown for transmitting information to the location, and numeral 16 indicates a cradle. As the ultrasonic welding machine operates, ultrasonic vibrations are transmitted from the exponential horn 15 to the conical protrusion 13, and the conical protrusion 13 generates heat and melts to be bonded as shown in FIG.

Such ultrasonic welding is performed for each joining point J sequentially or simultaneously to join the upper and lower halves 2.3, and to bring the abutting surfaces 10a, lla of the peripheral walls 10, 11 into close contact with each other.

This completes the assembly of the disk cartridge body.

Incidentally, when joining the upper and lower halves 2.3, a disk or the like (not shown) is loaded in advance between the upper and lower halves 2.3.

Thereafter, the shutter 6 and the like are attached to the upper and lower halves 2.3 to form a completed product.

[Operation and effect of the invention]

As described above, the present invention sets a plurality of locations on the abutting surfaces of the peripheral wall of the upper half piece and the peripheral wall of the lower half piece as joint locations, and forms a protrusion on one of the upper and lower halves at the joint location. Then, after overlapping the upper and lower halves so that the tips of the protrusions are in contact with the abutting surfaces of the other half,
Since welding is performed using ultrasonic waves at the location of the protrusion,
The protrusions melt and the butt surfaces can be welded and butted together at the same time. Therefore, according to the present invention, there is no need to tighten fixing screws as in the conventional method, and the disk cartridge can be assembled easily and quickly, and the disk cartridge does not suffer from cracks or the like during assembly. Furthermore, since fixing screws are not required, the number of parts can be reduced accordingly.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway vertical sectional view of the joining point of the upper and lower halves at the start of welding, Fig. 2 is a sectional view taken along the line ■-U in Fig. 5,
FIG. 3 is a perspective view of the upper half piece, FIG. 4 is a perspective view of the lower half piece, and FIG. 5 is a perspective view of a disk cartridge assembled by the method according to the present invention and equipped with a rear shutter and the like. 1...Disk cartridge, 2...Upper half piece, 3.
... Lower half piece, 10 ... Peripheral wall, 10a ... Butt surface, 11 ... Peripheral wall, lla ... Butt surface, 13 ...
- Conical projection, 14... Magnetic distortion vibrator, 15... Exponential horn, 16... Rest, J... Connection point.

Claims (1)

[Claims] In a method for assembling a disk cartridge in which an upper half piece and a lower half piece are assembled and the upper and lower halves are joined together at a joining point set at an appropriate position on both the upper and lower half pieces, a protrusion between a peripheral wall of the upper half piece and a peripheral wall of the lower half piece is provided. A plurality of locations on the mating surfaces are set as the joining locations, and a projection is formed on one of the upper and lower halves at the joining location, such that the tip of the projection comes into contact with the butting surface of the other half. A method for assembling a disk cartridge, characterized in that after the upper and lower halves are overlapped, ultrasonic welding is performed on the protrusion to connect the upper and lower halves.