Power supply device

Abstract

To provide a power supply device in which a plug is less likely to deform a jack.SOLUTION: A power supply device 1 comprises: a power supply cable 5 having a plug 7; and a power source unit 3 provided with a jack 33. The plug 7 has a plug body 11 and a rod-shaped electrode part 13. The jack 33 has an electrode receiving part 43, located inside an insertion port 42, which is electrically connected to the rod-shaped electrode part 13 when the rod-shaped electrode part 13 is inserted. On the outside of the insertion port 42 of the jack 33, there is provided a cylindrical part 35 which extends in the extension direction of the electrode receiving part 43, and which has an inner circumferential dimension slightly larger than the external dimension of the plug body 11 so as to allow the entry of the plug body 11 when the plug 7 is inserted into the jack 33. If the length dimension of the electrode receiving part 43 is defined as L1 and the length dimension of the cylindrical part 35 is defined as L2, then the length dimension of the electrode receiving part 43 and the length dimension of the cylindrical part 35 has a relationship which satisfies the following equation: L2 / L1≥1 / 2.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a power supply device.

Background Art

[0002] Clothes with a fan attached thereto that rotates the fan to blow air into the clothes have become widespread. In the clothes with a fan, a power supply unit that supplies power to the fan, which is a power receiving device, is attached to the clothes, and the fan and the power supply unit are connected by a power supply cable.

[0003] When performing work while wearing the clothes with a fan, etc., a load may be applied to the power supply unit or the power supply cable, and the connection portion between the plug and the jack may be deformed, resulting in the inability to supply power. Therefore, for example, as in Patent Document 1, measures have been taken to make it difficult to deform even when an impact is applied to the power supply unit or the power supply cable. The power supply cable (DC cable) described in Patent Document 1 has a flange portion that abuts against the case provided on the plug body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the power supply cable described in Patent Document 1 cannot buffer an impact unless the flange portion is in a state of contacting the case (a state where the plug is inserted into the jack). Further, since the flange portion is made of rubber, even when the flange portion is in a state of abutting against the case, the flange portion may bend due to an impact, the plug may tilt with respect to the jack, and the jack may be deformed.

[0006] The objective of the present invention is to provide a power supply device that can suppress deformation of the jack caused by the plug, not only when the plug is inserted into the jack, but also while the plug is being inserted into the jack and while the plug is being pulled out of the jack. [Means for solving the problem]

[0007] To achieve the above objective, the power supply device of the present invention comprises a power supply cable having a plug at one end and a powered device connected to the other end, and a power supply unit having a jack into which the plug is inserted and which supplies power to the powered device, wherein the plug has a plug body covered with an insulating material and a rod-shaped electrode portion extending from the plug body and being thinner than the plug body, and the jack has an insertion opening into which the plug can be inserted and is cylindrical, positioned inside the insertion opening into which the rod-shaped electrode portion can be inserted, The jack has an electrode receiving portion that is electrically connected to the rod-shaped electrode portion when the rod-shaped electrode portion is inserted, and on the outside of the insertion opening of the jack, there is a cylindrical portion that extends in the direction in which the electrode receiving portion extends, has an inner circumference slightly larger than the outer circumference of the plug body, and into which the plug body fits when the plug is inserted into the jack, and the length of the electrode receiving portion and the length of the cylindrical portion satisfy the relationship L2 / L1 ≥ 1 / 2 when the length of the electrode receiving portion is L1 and the length of the cylindrical portion is L2. and the inner peripheral dimension of the cylindrical portion is such that a gap is formed throughout the area between the plug body when the plug is inserted into the jack. When the dimension measured vertically from the bottom of the electrode receiving portion to the opening end of the cylindrical portion is L3, the dimension g of the gap satisfies the relationship g < L3 / 10 Yes, they are. [Effects of the Invention]

[0008] As described above, the plug has a cylindrical section, and the length of the electrode receiving section and the length of the cylindrical section satisfy the relationship L2 / L1≧1 / 2. Therefore, the plug does not tilt beyond a predetermined angle relative to the jack, not only when it is inserted into the jack, but also while inserting it into the jack or while removing it from the jack. As a result, the rod-shaped electrode section of the plug does not deform the electrode receiving section of the jack. [Brief explanation of the drawing]

[0009]

Figure 1

Figure 2

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Figure 4

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Figure 8

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Figure 10

[0010] Hereinafter, embodiments of the power supply device according to the present invention will be described with reference to the drawings.

[0011] Figure 1 is a perspective view of a power supply device 1, which is an example of this embodiment; Figure 2 is a schematic diagram of the end face obtained by cutting the plug with a plane passing through the center of the rod-shaped electrode portion; Figure 3 is a front view of the power supply unit; Figure 4 is a right side view of the power supply unit; Figure 5 is a schematic diagram of the end face obtained by cutting along the VV line portion shown in Figure 4; and Figure 6 is an exploded perspective view of the rear of the power supply unit. In Figure 2, for the sake of explanation, the plug body 11 and the rod-shaped electrode portion 13 are shown as a single unit.

[0012] <Power supply device> The power supply device 1 supplies power to a fan (power receiving device) provided in a garment with a fan not shown in the figure. The power supply device 1 includes a power supply unit 3 and a power supply cable 5. During use, the power supply cable 5 is connected between the power supply unit 3 and the fan, and the power supply unit 3 is housed in a pocket provided inside the garment with the fan.

[0013] <Power supply cable> The power supply cable 5 is a so-called DC cable that supplies DC power from the power supply unit 3 to the fan (power receiving device). The power supply cable 5 includes a plug (power supply unit side plug) 7, a cable 9, and a fan side plug (not shown). In FIG. 1, only the plug 7 of the power supply cable 5 and the cable 9 (partially omitted) are shown. The plug 7 has a plug body 11 and a rod-shaped electrode portion 13.

[0014] The plug body 11 is covered with an insulating material (rubber) and has a first cylindrical portion 15 and a second cylindrical portion 17. The first cylindrical portion 15 is thicker than the rod-shaped electrode portion 13 and is a cylindrical portion where the rod-shaped electrode portion 13 extends axially from the center portion at one end. A protruding portion 15a extending in the circumferential direction is formed on the circumferential surface of the first cylindrical portion 15 (see FIG. 8). The second cylindrical portion 17 is a cylindrical portion that extends axially from the other end of the first cylindrical portion 15 and is thicker than the first cylindrical portion 15, and is a portion that enters into a cylindrical portion 35 described later. As shown in FIG. 2, the maximum diameter dimension of the second cylindrical portion 17 is denoted as D1.

[0015] The rod-shaped electrode portion 13 extends from the plug body 11 and is in a rod shape thinner than the plug body 11 (the first cylindrical portion 15 and the second cylindrical portion 17). As shown in FIG. 2, the rod-shaped electrode portion 13 has a hollow rod shape with an opening at the tip 13a, and has a plug side first electrode 19 formed on the inner circumferential surface 13A and a plug side second electrode 21 formed on the outer circumferential surface 13B.

[0016] <Power supply unit> As shown in FIGS. 1, 3, and 4, the power supply unit 3 has a hollow box-shaped case 23. Inside the case 23, a secondary battery (not shown) such as a lithium-ion battery and a control circuit (not shown) for controlling charging and discharging of the secondary battery are housed.

[0017] [Front of the case] On the front portion 23A of the case 23, a push switch 25 for controlling power supply to the fan and an indicator 27 for indicating the output state etc. of the power supply unit 3 are provided. When the push switch 25 is pressed with the power supply output of the power supply unit 3 in the off state, the output starts at output level 1, and each time the push switch 25 is pressed, the output level changes from 1 to 4. And the indicator 27 changes according to the output level. Also, when the push switch 25 is long-pressed, the power supply output of the power supply unit 3 turns off. The indicator 27 can also indicate an error state of the power supply unit 3 or, by the operation of the user, indicate the remaining charge amount of the secondary battery of the power supply unit 3.

[0018] Around the push switch 25 and the indicator 27, a protruding wall portion 29 surrounding the push switch 25 and the indicator 27 is formed (see FIG. 4). The protruding wall portion 29 has a rounded rectangular shape when the case 23 is viewed from the front. By housing the power supply unit 3 in the pocket of the fan-equipped clothing with the front of the case 23 where the push switch 25 is provided facing outward, when the user touches the power supply unit 3 with a finger from above the clothing, the position of the push switch 25 can be grasped due to the unevenness caused by the protruding wall portion 29. That is, the power supply unit 3 can be operated by the user while being housed in the pocket.

[0019] [[ID=一三]] [Right side of the case and plug insertion portion] On the right side wall portion 23B of the case 23, a plug insertion portion 31 for inserting the plug 7 of the power supply cable 5 is provided. As shown in FIG. 5, the plug insertion portion 31 includes a jack 33, a cylindrical portion 35, an intermediate wall portion 37, and a rubber bush 39.

[0020] The jack 33 has a housing 41 and an electrode receiving portion 43, and is housed in a jack storage portion 34 within the case 23. The housing 41 houses the electrode receiving portion 43 and has an insertion opening 42 into which a plug can be inserted. The insertion opening 42 is positioned in alignment with the opening 34A of the jack storage portion 34. The electrode receiving portion 43 is located inside the insertion opening 42 and is cylindrical into which the rod-shaped electrode portion 13 can be inserted. When the rod-shaped electrode portion 13 is inserted, the electrode receiving portion 43 has a jack-side first electrode 45 and a jack-side second electrode 47 that are electrically connected to the rod-shaped electrode portion 13.

[0021] The jack-side first electrode 45 is a pin-shaped electrode. The jack-side first electrode 45 enters the inside of the rod-shaped electrode portion 13 and makes contact with the plug-side first electrode 19 to make an electrical connection. The jack-side second electrode 47 is an electrode consisting of a contact spring positioned opposite the outer circumferential surface of the jack-side first electrode 45. When the jack-side first electrode 45 enters the rod-shaped electrode portion 13, the jack-side second electrode 47 makes contact with the plug-side second electrode 21 to make an electrical connection. When the rod-shaped electrode portion 13 is inserted, the jack-side second electrode 47 is biased against the rod-shaped electrode portion 13 by the tip 13a and side surface of the rod-shaped electrode portion 13 coming into contact and being compressed.

[0022] In this embodiment, the length dimension of the first electrode 45 on the jack side is set to the length dimension of the electrode receiving portion 43, and is denoted as L1.

[0023] The cylindrical portion 35 is a cylindrical part provided on the outside of the insertion opening 42 of the jack 33. In this embodiment, the cylindrical portion 35 is part of the case 23, but it may of course be a separate part from the case 23. The cylindrical portion 35 is the part into which the second cylindrical portion 17 of the plug body 11 fits when the plug 7 is inserted into the jack 33. The cylindrical portion 35 extends in the direction in which the electrode receiving portion 43 (especially the jack-side first electrode 45) extends, and its inner circumference is slightly larger than the outer circumference (maximum diameter D1) of the second cylindrical portion 17 of the plug body 11.

[0024] As shown in Figure 5, the length dimension of the cylindrical portion 35 is L2, and the inner diameter dimension of the cylindrical portion 35 is D2.

[0025] The intermediate wall portion 37 is part of the case 23 between the jack insertion port 42 and the cylindrical portion 35, and is the portion where the rubber bush 39 is located.

[0026] The rubber bushing 39 is a cylindrical elastic body having an inner diameter that is approximately the same as the diameter of the first cylindrical portion 15 of the plug body 11, and at least a part of its outer surface is in close contact with the inner surface of the intermediate wall portion 37. The rubber bushing 39 is part of a waterproof structure that prevents moisture from entering the jack housing portion 34 when the plug 7 is inserted. In this embodiment, the rubber bushing 39 has a cylindrical portion 39C and flange portions 39A and 39B provided at both ends of the cylindrical portion 39C, respectively.

[0027] The intermediate wall portion 37 has a large-diameter portion 37A and a small-diameter portion 37B. The large-diameter portion 37A extends continuously with the cylindrical portion 35 and is the portion that the flange portion 39A of the rubber bush 39 contacts. The small-diameter portion 37B constitutes the opening 34A of the jack housing portion 34, has a smaller inner diameter than the large-diameter portion 37A, and is the portion where the cylindrical portion 39C of the rubber bush 39 is located. As shown in the figure, a gap 38 is formed between the small-diameter portion 37B and the cylindrical portion 39C of the rubber bush 39.

[0028] A gap 49 is formed between the small-diameter portion 37B and the insertion opening 42 of the jack 33. The flange portion 39B of the rubber bush 39 fits into the gap 49. With this configuration, the wall portion of the small-diameter portion 37B is sandwiched between the flange portions 39A and 39B, and the rubber bush 39 fits into the intermediate wall portion 37.

[0029] As shown in Figure 5, L3 is defined as the dimension measured vertically from the bottom 43a of the electrode receiving portion 43 to the open end of the cylindrical portion 35.

[0030] As shown in Figure 3, the outer circumference 35A of the cylindrical portion 35 is visible from the front of the case 23. The cylindrical portion 35 has a shape and dimensions such that it does not protrude from the case 23 that constitutes the power supply unit 3 when the case 23 is projected from the front (in a direction perpendicular to the direction in which the cylindrical portion 35 extends). In other words, the plug insertion portion 31 is located inside the projected area of ​​the case 23 from the front.

[0031] [Back of the case] As shown in Figure 6, the rear portion 23C of the case 23 has a recess 23D for attaching a nameplate and a recess 23E for attaching a barcode sticker. The barcode sticker recess 23E is formed within the nameplate sticker recess 23D. The main nameplate sticker 51 is attached to the nameplate sticker recess 23D, and the recess is deeper than the thickness of the main nameplate sticker 51. The barcode sticker 53 is attached to the barcode sticker recess 23E, and the recess is deeper than the thickness of the barcode sticker 53. The main nameplate sticker 51 contains the specifications of the power supply unit 3, and a transparent window 52 is provided in a position that covers the barcode sticker recess 7E. The barcode sticker 53 has a barcode printed on it to identify the manufacturing lot of the power supply unit 3. The barcode sticker 53 is first attached to the barcode sticker recess 23E, and then the main nameplate sticker 51 is attached to the nameplate sticker recess 23D on top of it. This allows the barcode printed on the barcode sticker 53 to be readably exposed through the window portion 52 while the main nameplate sticker 51 protects the barcode sticker 53.

[0032] <With the plug inserted into the jack> Figure 7 is a schematic diagram of the end face of the power supply unit and power supply cable cut at the VV line portion shown in Figure 4, with the plug inserted into the jack. Figure 8 is a magnified view of a part of the portion indicated by the symbol VIII in Figure 7. In the state shown in Figure 7, the rod-shaped electrode portion 13 of the plug 7 is inserted into the jack 33, and the tip 13a of the rod-shaped electrode portion 13 is in contact with the bottom 43a of the electrode receiving portion 43. At this time, the first cylindrical portion 15 of the plug 7 is inserted into the rubber bush 39, and the second cylindrical portion 17 is inserted into the cylindrical portion 35. The state shown in Figure 7 is called the "fully inserted state of the plug 7".

[0033] In this embodiment, the inner circumference of the cylindrical portion 35 is such that a gap G is formed across the entire area between it and the plug body 11 when the plug 7 is fully inserted. The dimension g of the gap G can be expressed as g = (D2 - D1) / 2.

[0034] Furthermore, when the plug 7 is fully inserted, as shown in Figure 8, the first cylindrical portion 15 of the plug 7 fits inside the rubber bush 39. As a result, the protruding portion 15a of the first cylindrical portion 15 is in close contact with the inner circumferential surface 39x of the rubber bush 39, and the circumferential surface 39y of the flange portion 39A of the rubber bush 39 is in close contact with the inner circumferential surface 37y of the large diameter portion 37A of the intermediate wall portion 37. This creates a waterproof structure between the first cylindrical portion 15 and the rubber bush 39, and between the intermediate wall portion 37 and the rubber bush 39. Note that a gap 38 exists between the small diameter portion 37B and the cylindrical portion 39C of the rubber bush 39. Therefore, deformation of the rubber bush 39 due to the protruding portion 15a can be avoided, and even with the protruding portion 15a present, the first cylindrical portion 15 can be smoothly inserted into the rubber bush 39.

[0035] <Relationship between the lengths of each part> In this embodiment, the inner circumference of the cylindrical portion 35 is made slightly larger than the outer dimensions (maximum diameter dimension D1) of the second cylindrical portion 17 of the plug body 11. In addition, the length dimensions L1 of the electrode receiving portion 43 (jack-side first electrode 45) and L2 of the cylindrical portion 35 are set such that L2 / L1 ≥ 1 / 2. That is, if the length dimension L1 of the electrode receiving portion 43 (jack-side first electrode 45) is "2", then the length dimension L2 of the cylindrical portion 35 will be "1" or greater. In this embodiment, as an example, L1 is 8.4 mm and L2 is 5.0 mm.

[0036] Because of this configuration, not only when the plug 7 is inserted into the jack 33, but also while inserting the plug 7 into the jack 33 and while pulling the plug 7 out of the jack 33, if the plug 7 tilts relative to the jack 33, the plug body 11 (second cylindrical portion 17) of the plug 7 contacts the inner surface of the cylindrical portion 35, restricting the tilt, so that the plug 7 does not tilt beyond a predetermined angle relative to the jack 33. In this embodiment, as will be described later, verification results show that the predetermined angle is "6°". Therefore, the rod-shaped electrode portion 13 of the plug does not deform the electrode receiving portion 43 of the jack 33.

[0037] In particular, as in this embodiment, if the jack-side second electrode 47 is an electrode made of a contact spring, if the rod-shaped electrode portion 13 is inserted or pulled out at an angle relative to the electrode receiving portion 43, excessive force may be applied to the jack-side second electrode 47, causing plastic deformation and potentially preventing electrical connection between the plug-side second electrode and the jack-side second electrode 47. However, with this configuration, the plug 7 does not tilt beyond a predetermined angle relative to the jack 33, thus preventing deformation of the jack-side second electrode 47.

[0038] <Basis for angle θ> The inventors conducted an experiment to pull out the plug 7 shown in Figure 9 to verify the allowable angle θ of the plug 7's inclination relative to the jack 33. As shown in Figure 9, the "angle θ" is more specifically the angle formed by a virtual line IL1 extending from the center of the jack-side first electrode 45 of the jack 33 and a virtual line IL2 extending from the center of the rod-shaped electrode portion 13 of the plug 7. The procedure for the plug 7 pull-out experiment is as follows. Prepare two types of jacks 33 (jacks (1) and (2)) having jack-side first electrodes 45 of different lengths, and a plug 7 that is a set with these jacks 33; Insert the plug 7 into the jack 33, and define the "withdrawal distance 0 mm" as the state where the tip 13a of the rod-shaped electrode part 13 contacts the bottom 43a of the electrode receiving part 43; Repeat the experiment of pulling plug 7 out of jack 33, changing the angle θ from 0° to 16° in 1° increments; • Confirm the relationship between the pull-out ratio [%] of the rod-shaped electrode portion 13 (pulling distance PL of the rod-shaped electrode portion 13 / length L1 of the jack-side first electrode 45) and the angle θ when the jack-side second electrode 47 is deformed by the rod-shaped electrode portion 13.

[0039] Figure 10 is a graph summarizing the experimental results described above. As shown in Figure 10, up to a pull-out ratio of 50%, the second electrode 47 on the jack side is prone to deformation when the angle θ is between 6° and 10°, and when the pull-out ratio exceeds 50%, the second electrode 47 on the jack side is prone to deformation when the angle θ exceeds 16°. Furthermore, it was found that when the pull-out ratio exceeds 80%, the deformation of the second electrode 47 on the jack side by the rod-shaped electrode portion 13 tends to disappear. From these experimental results, the inventors concluded that by keeping the angle θ below 6°, the rod-shaped electrode portion 13 of the plug 7 will not deform the electrode receiving portion 43 of the jack 33. Based on these experimental results, L1 and L2, and D1 and D2 were determined so that the plug 7 does not tilt more than a predetermined angle (6°) relative to the jack 33, not only when the plug 7 is inserted into the jack 33, but also while inserting the plug 7 into the jack 33 and while pulling the plug 7 out of the jack 33.

[0040] Furthermore, the dimension g of the gap G is set to satisfy g < L3tan6° ≒ L3 / 10 so that the angle of the plug with respect to the jack 33 does not exceed a predetermined angle (for example, 6°). In this embodiment, as an example, g is set to 0.3 mm. Thereby, not only when the plug is inserted into the jack, but also when the plug is being inserted into the jack and when the plug is being pulled out of the jack, deformation of the jack caused by the plug can be more reliably suppressed.

[0041] <Operation of the power supply device> The operation of the power supply device of this embodiment will be described below.

[0042] The power supply device 1 of this embodiment includes a power supply cable 5 having a plug 7 at one end and a power supply device connected to the other end, and a power supply unit 3 provided with a jack 33 into which the plug 7 is inserted and supplying power to the power supply device. The plug 7 has a plug body 11 covered with an insulating material and a rod-shaped electrode portion 13 extending from the plug body 11 and thinner than the plug body 11. The jack 33 has an insertion port 42 into which the plug 7 can be inserted, and is arranged inside the insertion port 42 and is in a cylindrical shape into which the rod-shaped electrode portion 13 can be inserted. When the rod-shaped electrode portion 13 is inserted, it has an electrode receiving portion 43 that is electrically connected to the rod-shaped electrode portion 13. Outside the insertion port 42 of the jack 33, there is provided a cylindrical portion 35 that extends in the direction in which the electrode receiving portion 43 extends and has an inner peripheral dimension slightly larger than the outer peripheral dimension of the plug body 11, and into which the plug body 11 enters when the plug 7 is inserted into the jack 33. The length dimension of the electrode receiving portion 43 and the length dimension of the cylindrical portion 35 satisfy the relationship L2 / L1 ≧ 1 / 2 when the length dimension of the electrode receiving portion 43 is L1 and the length dimension of the cylindrical portion 35 is L2.

[0043] With such a configuration, not only when the plug 7 is inserted into the jack 33 (fully inserted state of the plug 7), but also when the plug 7 is being inserted into the jack 33 and when the plug 7 is being pulled out of the jack 33, the plug 7 does not tilt with respect to the jack 33 at a predetermined angle or more. Therefore, the rod-shaped electrode portion 13 of the plug 7 does not deform the electrode receiving portion 43 of the jack 33.

[0044] The rod-shaped electrode portion 13 has a hollow rod shape with an opening at its tip 13a, and has a plug-side first electrode 19 formed on its inner circumferential surface 13A and a plug-side second electrode 21 formed on its outer circumferential surface 13B. The electrode receiving portion 43 may have a pin-shaped jack-side first electrode 45 that fits inside the rod-shaped electrode portion 13 and contacts the plug-side first electrode 19 for electrical connection, and a jack-side second electrode 47 positioned opposite the outer circumferential surface of the jack-side first electrode 45, which contacts the plug-side second electrode 21 for electrical connection when the jack-side first electrode 45 enters the rod-shaped electrode portion 13.

[0045] In this configuration, if the plug 7 tilts relative to the jack 33, the rod-shaped electrode portion 13 will deform the jack-side second electrode (contact spring) 47 in particular. However, in this configuration, the plug 7 does not tilt beyond a predetermined angle relative to the jack 33, not only when the plug 7 is inserted into the jack 33, but also while inserting the plug 7 into the jack 33 and while removing the plug 7 from the jack 33. Therefore, the rod-shaped electrode portion 13 of the plug 7 does not deform the electrode receiving portion 43 of the jack 33.

[0046] The cylindrical portion 35 may have a shape and dimensions such that it does not protrude from the case 23 constituting the power supply unit 3 when projected from a direction perpendicular to the direction in which the cylindrical portion 35 extends.

[0047] In this way, the cylindrical portion 35 is contained within the projection range, so that the cylindrical portion 35 is not subjected to external impact.

[0048] The inner circumference of the cylindrical portion 35 may be such that a gap is formed across its entire length from the plug body 11 when the plug 7 is inserted into the jack 33.

[0049] Since a gap is formed, even if there is a cylindrical portion 35, it is easy to insert the plug 7 into the jack 33. Further, since the plug 7 in the state of being inserted into the jack 33 can rotate around the axis of the rod-shaped electrode portion 13, even if a load is applied to the power supply cable 5, the plug 7 can rotate to buffer the load.

[0050] When the dimension measured vertically from the bottom of the electrode receiving portion 43 to the opening end portion of the cylindrical portion 35 is L3, the dimension g of the gap G may satisfy the relationship of g < L3 / 10.

[0051] When the dimension g of the gap is represented by (D2 - D1) / 2, where D1 is the diameter dimension of the plug body 11 and D2 is the inner diameter dimension of the cylindrical portion 35. In the verification by the inventors, it was found that when the plug 7 tilts more than 6° with respect to the jack 33, the rod-shaped electrode portion 13 of the plug 7 is likely to deform the electrode receiving portion 43 of the jack. Therefore, the dimension g of the gap G is set to satisfy g < L3tan6° ≒ L3 / 10 in order to prevent the angle of the plug with respect to the jack 33 from exceeding a predetermined angle (6°). Thereby, not only when the plug is inserted into the jack, but also when the plug is being inserted into the jack or pulled out from the jack, the jack can be more reliably protected from deformation caused by the plug.

[0052] A waterproof structure may be provided between the insertion port 42 of the jack 33 and the cylindrical portion 35. Even if a gap is provided, by providing a waterproof structure, the electrodes can be protected from moisture such as sweat.

[0053] The plug body 11 is thicker than the rod-shaped electrode portion 13 and has a cylindrical first cylindrical portion 15 from which the rod-shaped electrode portion 13 extends from the center of one end, and a second cylindrical portion 17 extending from the other end of the first cylindrical portion 15 and being thicker than the first cylindrical portion 15. Between the insertion opening 42 of the jack 33 and the cylindrical portion 35, there is an intermediate wall portion 37 through which the first cylindrical portion 15 of the plug body 11 passes when the plug 7 is inserted into the jack 33. A cylindrical elastic body 39 is arranged on the inner circumferential surface of the intermediate wall portion 37, having an inner diameter substantially the same as that of the first cylindrical portion 15, and at least a part of its outer circumferential surface being in close contact with the inner circumferential surface of the intermediate wall portion 37. When the plug 7 is inserted into the jack 33, the first cylindrical portion 15 enters the elastic body 39, and a waterproof structure may be formed between the first cylindrical portion 15 and the elastic body 39, and between the intermediate wall portion 37 and the elastic body 39.

[0054] In this way, a waterproof structure can be created simply by inserting plug 7 into jack 33.

[0055] Although embodiments of the present invention have been specifically described above, the present invention is not limited to these embodiments, and modifications are, of course, possible within the scope of the technical idea of ​​the present invention.

[0056] For example, in the above example, the cylindrical portion 35 is cylindrical, but the cross-sectional shape can also be square or hexagonal.

[0057] Furthermore, in the above example, a waterproof structure using a rubber bushing 39 is provided between the socket 42 of the jack 33 and the cylindrical part 35, but it is not always necessary to provide a waterproof structure. If a waterproof structure is not provided, the intermediate wall 37 and the rubber bushing 39 are unnecessary, and the cylindrical part 35 can be extended adjacent to the socket 42 of the jack 33.

[0058] Furthermore, the above figures are merely examples and can be modified as appropriate within the scope of the above conditions. [Explanation of Symbols]

[0059] 1. Power supply device 3 Power supply unit 5 Power supply cable 7 plugs 9 Cables 11 Plug body 13 Rod-shaped electrode part 15. First cylindrical section 17. Second cylindrical section 19 Plug-side first electrode 21 Plug-side second electrode 23 cases 25 Push switches 27 Indicators 29 Projecting wall part 31 Plug insertion part 33 Jack 35 Cylindrical part 37 Intermediate wall section 39 Rubber bushings 41 Housing 42 outlets 43 Electrode receiving section 45 Jack side first electrode 47 Jack side second electrode 49 Gap 51 Main nameplate sticker 52 Window section 53 Barcode stickers

Claims

1. A power supply cable having a plug at one end and a powered device connected at the other end, A power supply unit is provided, which has a jack into which the plug is inserted and supplies power to the powered device, The aforementioned plug is The plug body is covered with insulating material, It has a rod-shaped electrode portion that extends from the plug body and is thinner than the plug body, The aforementioned Jack, An outlet into which the aforementioned plug can be inserted, It is positioned inside the aforementioned insertion opening and has a cylindrical shape into which the rod-shaped electrode portion can be inserted, and has an electrode receiving portion that is electrically connected to the rod-shaped electrode portion when the rod-shaped electrode portion is inserted. On the outside of the insertion opening of the jack, there is a cylindrical portion that extends in the direction in which the electrode receiving portion extends, has an inner circumference slightly larger than the outer dimensions of the plug body, and into which the plug body fits when the plug is inserted into the jack. The length dimensions of the electrode receiving portion and the length dimensions of the cylindrical portion satisfy the relationship L2 / L1 ≥ 1 / 2, where L1 is the length dimension of the electrode receiving portion and L2 is the length dimension of the cylindrical portion. The inner circumference of the cylindrical portion is such that, when the plug is inserted into the jack, a gap is formed across the entire area between it and the plug body. When L3 is the dimension measured vertically from the bottom of the electrode receiving portion to the open end of the cylindrical portion, the dimension g of the gap satisfies the relationship g < L3 / 10. A power supply device characterized by the following features.

2. The rod-shaped electrode portion has a hollow rod shape with an opening at its tip, and includes a plug-side first electrode formed on its inner circumferential surface and a plug-side second electrode formed on its outer circumferential surface. The electrode receiving portion includes a pin-shaped jack-side first electrode that fits inside the rod-shaped electrode portion and contacts the plug-side first electrode for electrical connection, and a jack-side second electrode positioned opposite the outer circumferential surface of the jack-side first electrode, which contacts the plug-side second electrode for electrical connection when the jack-side first electrode enters the rod-shaped electrode portion. The power supply device according to feature 1.

3. The cylindrical portion has a shape and dimensions such that it does not protrude from the case constituting the power supply unit when projected from a direction perpendicular to the direction in which the cylindrical portion extends. The power supply device according to feature 1.

4. A waterproof structure is provided between the socket and the cylindrical part of the jack. The power supply device according to feature 1.

5. The plug body has a first cylindrical portion which is thicker than the rod-shaped electrode portion and from the center of one end of the first cylindrical portion that the rod-shaped electrode portion extends outwards, and a second cylindrical portion which extends from the other end of the first cylindrical portion and is thicker than the first cylindrical portion. Between the socket and the cylindrical portion of the jack, there is an intermediate wall portion through which the first cylindrical portion of the plug body passes when the plug is inserted into the jack. A cylindrical elastic body is disposed on the inner circumferential surface of the intermediate wall portion, having an inner diameter substantially the same as the diameter of the first cylindrical portion, and having at least a portion of its outer circumferential surface in close contact with the inner circumferential surface of the intermediate wall portion. When the plug is inserted into the jack, the first cylindrical portion enters the elastic body, and the waterproof structure is formed between the first cylindrical portion and the elastic body, and between the intermediate wall portion and the elastic body. The power supply device according to feature 4.

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