JP4251195B2 - Cord connection device - Google Patents

Description

The present invention is a cord connecting device used in, for example, a disk device (DVD player, DVD recorder, etc.), and prevents a cord short-circuit accident.

An example of a disk device is shown in FIG. This is a board 3 in which a DVD device 2 and an electronic device (not shown) for controlling the DVD device 2 are mounted in a housing 1 composed of a bottom plate portion 1A, a top plate portion 1B and a front plate portion 1C. And an AC cord 4 for energizing the electronic device on the substrate 3.

The DVD device 2 is mounted on a main chassis 7 that supports the disk D mounting tray 6 so as to be able to move forward and backward a and b, and a reverse chassis (not shown) pivotally supported by the main chassis 7 so as to move up and down. An optical pickup 8 and a turntable 9 are provided, and a clamper 11 is arranged on a cross beam 10 installed on the main chassis 7 so as to face the turntable 9 so as to be movable up and down within a certain range. Reference numeral 12 denotes a disk outlet formed in the front plate portion 1C of the housing 1.

The operation procedure of the disc device will be described. In the play mode indicated by the solid lines in FIGS. 7A and 7B, the disc D is clamped by the clamper 11 and the turntable 9, and the disc D is rotated at a high speed by the turntable 9. The information recorded on the disk D is read by the optical pickup 8, and for example, an image based on the read information is reproduced on the monitor.

As shown in FIGS. 8 and 9, the cord 4 is formed by covering a pair of conductive wires 14 composed of a large number of wires 14 a with an insulating material 15.

Conventionally, as shown in FIG. 8 and FIG. 9, a pair of circular terminal insertion holes 16 are provided in the substrate 3 at a predetermined interval L, and both are exposed from the insulating material 15 of the cord 4. The terminals 14A of the lead wires 14 are inserted into the terminal insertion holes 16, respectively, and the terminals 14A are soldered 18 to printed wiring lands 17 printed on the back surface of the substrate 3. Screws 19 are fixed on the bottom plate 1A [see FIG. 7 (a)]. In addition, there exists what was described in patent document 1 as a technique relevant to this invention.
JP 10-1226025 A

In the above-described conventional configuration, the board 3 is reduced in size based on the user's request, so that the interval L between the two terminal insertion holes 16 is narrowed, and the board 3 with the cord 4 is placed in the housing 1. When assembling the disk device with the screw 19 stopped, the cord 4 is pulled or twisted, and an excessive load F is applied to the base portion of the cord 4, so that FIG. ), The terminals 14A are rubbed against the right-angled corners 20 on the surface side periphery of the terminal insertion holes 16, and the wires 14a of the terminals 14A are cut by the corners 20. Yes (see imaginary line), there is a risk of a short accident between the cut wires 14a.

The present invention has been made in view of the above-described conventional drawbacks, and an object of the present invention is to provide a cord connecting apparatus that prevents a cord short-circuit accident.

In order to achieve the above object, the invention described in claim 1 is a board in which a pair of conductors made of a number of wires are covered with an insulating material and a pair of circular terminal insertion holes are provided at predetermined intervals. A cord connecting device, wherein the terminals of both conductors exposed from the insulating material of the cord are respectively inserted into the terminal insertion holes, and the terminals are soldered to lands on the back surface of the board. , A slit is formed between the terminal insertion holes of the substrate so as to divide the terminal insertion holes,
A concave groove is formed in the inner peripheral surface of each terminal insertion hole facing each other .

The invention described in claim 1 corresponds to one embodiment (see FIGS. 4 and 5), and
According to this , the cord is pulled or twisted when assembling the substrate with the cord.
If an excessive load is applied to the base portion of the cord, the terminal of the cord
Even if it is rubbed against the surface side periphery of the terminal insertion hole, the inner peripheral surfaces of the terminal insertion holes
Since the groove is formed in the opposite part, the terminal only approaches the groove,
Wires are not cut as before, ensuring short-circuit accidents due to wire cutting
Can be prevented.

FIGS. 1 and 2 show a cord connecting device used in a disk device (see FIG. 7) which is a first reference example of the present invention. A slit 22 is formed so as to divide the hole 16, and a tapered surface chamfer 23 is formed by removing the surface side periphery of each terminal insertion hole 16 obliquely over the entire circumference or by pressing and deforming obliquely. . Since the configuration other than the above is substantially the same as the configuration shown in FIGS. 7 to 9, the same parts are denoted by the same reference numerals and the description thereof is omitted.

The manufacturing procedure of the tapered surface chamfered portion 23 will be described. Each terminal insertion hole 16 is drilled by a drill, and at the same time, each terminal insertion is performed by a tapered surface large-diameter blade portion integrally formed at the root portion of the drill. The peripheral edge on the surface side of the hole 16 is cut to form a tapered chamfered portion 23, or
Each terminal insertion hole 16 is drilled with a press, and at the same time, the peripheral edge on the surface side of each terminal insertion hole 16 is pressed and deformed by a tapered surface protrusion integrally formed with the press, thereby forming the tapered surface chamfered portion 2.
3 is formed.

According to the above configuration, since the slit 22 is formed so as to divide between the two terminal insertion holes 16 of the substrate 3, a short accident occurs in response to the downsizing of the substrate 3 based on the user's request. Therefore, the creepage distance between the two terminal insertion holes 16 can be increased.

Further, when the assembly work of the substrate 3 with the cord 4 is performed, the cord 4 is pulled or twisted, and an excessive load F is applied to the base portion of the cord 4, whereby the terminal 14 </ b> A of the cord 4. Is rubbed against any part of the surface side periphery of each terminal insertion hole 16, the wire 14a of each terminal 14A is pressed against or approaches the surface of the tapered chamfer 23 formed over the entire periphery of the surface side periphery. However, the wire 14a is not cut as in the prior art, and a short-circuit accident due to wire cutting can be reliably prevented.

FIG. 3 shows a cord connecting device used in a disk device (see FIG. 7) which is a second reference example of the present invention, in which the opposing portions of the surface side periphery of each terminal insertion hole 16 are inclined. The inclined chamfered portion 24 is formed by being pressed and deformed. Since the configuration other than the above is substantially the same as that of the first reference example (see FIGS. 1 and 2), the same parts are denoted by the same reference numerals and the description thereof is omitted.

According to the above-described configuration, the inclined surface chamfered portion 24 is formed in the opposing portion of the surface side periphery of each terminal insertion hole 16 that contacts the terminal 14 </ b> A of the cord 4. The terminal 14A is only pressed or approached, and the wire 1 of the terminal 14A
4a is not cut as in the prior art, and a short-circuit accident due to wire cutting can be reliably prevented.

In particular, since the inclined chamfered portion 24 is small, each terminal insertion hole 16 is penetrated into the substrate 3 with a press, and at the same time, the surface side periphery of each terminal insertion hole 16 is only partially pressed and deformed with the press. The inclined chamfered portion 24 can be easily molded, and the molding cost is low.

4 and 5 show a cord connecting device used in the disk device (see FIG. 7) according to an embodiment of the present invention, in which semicircular portions are formed on the inner surface of each terminal insertion hole 16 facing each other. A concave groove 25 is provided . Since the configuration other than the above is substantially the same as that of the first reference example (see FIGS. 1 and 2), the same parts are denoted by the same reference numerals and the description thereof is omitted.

The inner diameter h of the concave groove 25 is 0.5 to 0.8 times the inner diameter H of each terminal insertion hole 16 (preferably 0).
. 6 to 0.7 times). When the inner diameter h is less than 0.5 times the inner diameter H, the groove 2
5 becomes too small, the terminal 14A may be rubbed against the groove end 25a of the groove 25 due to an excessive load F generated when assembling the substrate 3 with the cord 4, and the wire 14a may be cut. is there. If the inner diameter h exceeds 0.8 times the inner diameter H, the terminal 14A may enter the concave groove 25 and be displaced. Therefore, in this embodiment, by setting the inner diameter h to 0.5 to 0.8 times (preferably 0.6 to 0.7 times) the inner diameter H,
The wire 14 a is not cut, and the terminal 14 A is held in the terminal insertion hole 16. As an example of specific dimensions, the inner diameter H of the terminal insertion hole 16 is 3 mm, concave
The inner diameter h of the groove 25 is 2 mm.

According to the above configuration, the grooves 25 in mutually opposite portions of the surface side peripheral edge of the terminal insertion hole 16 to contact with the terminal 14A of the cord 4 is formed, the terminal 14A is proximity to the concave groove 25 The wire 14a of the terminal 14A is not cut as in the prior art,
Short-circuit accidents due to wire cutting can be reliably prevented.

In particular, it is only necessary to pierce the concave grooves 25 in the mutually opposing portions of the inner side surfaces of the terminal insertion holes 16.
Since that, the molding cost may be reduced.

FIG. 6 shows a modification, in which a partition plate 26 protruding integrally with the bottom plate portion 1A of the housing 1 is protruded above the surface of the substrate 3 through the slit 22 from the back surface side of the substrate 3. It is.

According to the above configuration, even if the wire 14a of each terminal 14A is cut, since the cut wire 14a is blocked by the partition plate 26, a short-circuit accident due to wire cutting can be prevented more reliably.

(A) is a principal part expanded longitudinal cross-sectional view of the cord connection apparatus which is the 1st reference example of this invention, (b) is an AA arrow directional view. It is the same exploded perspective view. (A) is a principal part expanded longitudinal cross-sectional view of the cord connection apparatus which is the 2nd reference example of this invention, (b) is the same exploded perspective view. (A) is a principal part expanded longitudinal sectional view of the cord connection apparatus which is one Embodiment of this invention, (b) is a BB arrow directional view. It is the same exploded perspective view. (A) is a principal part expanded longitudinal cross-sectional view which shows a modification , (b) is CC arrow directional view. (A) is a partially cutaway plan view of the disk device, and (b) is a side view with the same part cutout. (A) is a principal part expanded longitudinal sectional view which shows a prior art example, (b) is a DD arrow directional view. It is the same exploded perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 DVD apparatus 3 Board | substrate 4 Code 14 Conductor 14A Conductor terminal 14a Wire 15 Insulation material 16 Terminal insertion hole 17 Land 18 Soldering 23 Tapered chamfer chamfer 24 Inclined chamfer chamfer 25 Groove 25a Groove end 26 Divider

Claims (1)

A cord having a pair of conductors made of a large number of wires covered with an insulating material, and a substrate having a pair of circular terminal insertion holes provided at predetermined intervals, and exposed from the insulator of the cord. It is a cord connecting device that inserts terminals into the respective terminal insertion holes and solders the respective terminals to lands on the back surface of the board, wherein the both terminal insertion holes are provided between the both terminal insertion holes of the board. Slits are formed so as to divide, and concave portions are formed in mutually opposing portions of the inner peripheral surface of each terminal insertion hole.
A cord connecting device, wherein a groove is provided therethrough .

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