Method and device for describing characters for capacitor element

Abstract

To propose a method for describing characters for a capacitor element, which describes characters on the capacitor element.SOLUTION: In a capacitor element 1, titanium dioxide is contained in a resin layer 11 of an element-holding tape 4 for stopping winding of a winding part 2. Accordingly, an ultraviolet laser beam 31 is scanned over the element-holding tape 4 (resin layer 11) on the basis of notation data for an ultraviolet laser marker 32 to describe characters, so that the titanium dioxide contained in the resin layer 11 is discolored and information such as a model number 15 and a manufacturing number 16 can be described on the element-holding tape 4.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for marking characters on a capacitor element, and also to a character marking device for a capacitor element for marking characters on a capacitor element.

[0002] An aluminum electrolytic capacitor includes a capacitor element having a wound body in which an anode foil and a cathode foil are wound via a separator, an electrolytic solution impregnating the wound body, and a case enclosing the wound body and the electrolytic solution. In the capacitor element described in Patent Document 1, the wound body is wound with an element fixing tape. The element fixing tape includes a resin layer and an adhesive layer laminated on one side of the resin layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the outer peripheral surface of the case of an aluminum electrolytic capacitor, the manufacturer, capacitance, and rated voltage are marked. These markings are made by letterpress printing in which ink is applied to a plate with inverted characters and pressed against the case. When traceability is required for an aluminum electrolytic capacitor from the viewpoint of improving the quality of a product using the aluminum electrolytic capacitor, a manufacturing lot number or the like may be printed on the outer peripheral surface of the case.

[0005] Here, from the viewpoint of improving the quality of the aluminum electrolytic capacitor itself, it is conceivable to mark information such as a manufacturing lot number on the capacitor element to improve the traceability of the capacitor element. However, at present, no method for marking characters or the like on a capacitor element has been proposed.

[0006] In view of the above problems, it is an object of the present invention to propose a method for character notation for a capacitor element for notating characters and the like on the capacitor element. Further, it is an object of the present invention to provide a character notation device for a capacitor element for notating characters and the like on the capacitor element.

Means for Solving the Problems

[0007] In order to solve the above problems, in the method for character notation for a capacitor element of the present invention, a wound body obtained by winding an anode foil and a cathode foil with a separator interposed therebetween, a resin layer, and an adhesive layer laminated on one side of the resin layer, and an element fixing tape that is attached to the outer peripheral surface of the wound body to fix the wound body. In the method for character notation for a capacitor element for notating characters on the capacitor element having the above, titanium dioxide is contained in the resin layer, notation data for notating the characters is input to an ultraviolet laser marker, and ultraviolet laser light is scanned on the resin layer based on the notation data, and the character is formed by discoloring the titanium dioxide contained in the resin layer. It is characterized by

[0008] According to the present invention, the element fixing tape for fixing the wound body includes a resin layer. Further, the resin layer contains titanium dioxide. Here, when titanium dioxide (TiO2) is irradiated with ultraviolet laser light, the titanium dioxide undergoes a color change. Therefore, by irradiating the resin layer with ultraviolet laser light by an ultraviolet laser marker and scanning along the characters, the titanium dioxide contained in the resin layer can be discolored to display desired characters on the element fixing tape. Here, since the present invention does not engrave characters by shaving the resin layer with laser light, the element fixing tape It is not damaged. Therefore, the wound body does not loosen due to damage or cutting of the element stop tape. Also, since the characters become the color of the discolored titanium dioxide, the characters displayed on the element stop tape are easy to visually recognize. Furthermore, since the present invention does not use ink to print characters, it is not necessary to consider the compatibility between the ink and the electrolytic solution, or the influence of the ink on the electrical characteristics, etc. in the manufacturing process of the electrolytic capacitor. Also, the present invention does not attach an element stop tape with characters printed in advance to the wound body. Therefore, in the final stage of manufacturing the capacitor element, information can be marked on the manufactured capacitor element. Therefore, the capacitor element and the information can be surely linked.

[0009] The character can be a model number.

[0010] Also, the character can be a manufacturing number. The manufacturing number includes a manufacturing lot number.

[0011] Next, the character marking device for a capacitor element of the present invention includes a supply mechanism for supplying the capacitor element to a marking position, and an ultraviolet laser marker for irradiating the capacitor element supplied to the marking position with ultraviolet laser light. The capacitor element includes a wound body in which an anode foil and a cathode foil are wound via a separator, and an element stop tape having a resin layer and an adhesive layer laminated on one side of the resin layer and attached to the outer peripheral surface of the wound body to stop the winding of the wound body. The resin layer contains titanium dioxide, and the ultraviolet laser marker scans the ultraviolet laser light on the resin layer based on marking data for marking characters, and discolors the titanium dioxide contained in the resin layer to mark the characters.

[0012] In the character marking device for capacitor elements of the present invention, the supply mechanism supplies a capacitor element containing titanium dioxide to the resin layer of the element-stopping tape that stops the winding body at the marking position. The ultraviolet laser marker scans the resin layer of the capacitor element at the marking position with ultraviolet laser light based on the marking data for marking characters. Therefore, the character marking device for capacitor elements can mark desired characters on the element-stopping tape by changing the color of the titanium dioxide contained in the resin layer. Since the character marking device for capacitor elements does not cut the resin layer with laser light to engrave characters, the element-stopping tape is not damaged. Therefore, the winding body does not loosen due to damage or cutting of the element-stopping tape. Also, since the characters are in the color tone of the discolored titanium dioxide, the characters displayed on the element-stopping tape are easy to visually recognize. Since the present invention does not print characters using ink, it is not necessary to consider the compatibility between the ink and the electrolytic solution, or the influence of the ink on the electrical characteristics, etc. in the manufacturing process of the electrolytic capacitor. Also, the present invention does not attach an element-stopping tape with pre-marked characters to the winding body. Therefore, at the final stage of manufacturing the capacitor element, information can be marked on the completed capacitor element. Therefore, the capacitor element and the information can be surely linked together.

[0013] The characters can be the model number.

[0014] Also, the characters can be the manufacturing number. The manufacturing number includes the manufacturing lot number.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0016] Hereinafter, with reference to the drawings, a braking device for an electrode foil with a current collector plate to which the present invention is applied will be described.

[0017] (Capacitor element) FIG. 1 is an explanatory diagram of a capacitor element. FIG. 2 is an explanatory diagram of a capacitor element. FIG. 2(a) is an explanatory diagram of a state before winding the winding portion with an element fixing tape, and FIG. 2(b) is a cross-sectional view of the element fixing tape. The capacitor element 1 in the present example shown in FIG. 1 is used, for example, in an aluminum electrolytic capacitor. As shown in FIG. 2(a), the capacitor element 1 includes a winding portion 2 (winding body) formed by winding an anode foil 5, a separator 6, a cathode foil 7, and a separator 6 in a cylindrical shape, and two lead terminals 3 drawn out from the anode foil 5 and the cathode foil 7 and protruding from the winding portion 2. The anode foil 5, the separator 6, the cathode foil 7, and the separator 6 are stacked in this order from the inner peripheral side to the outer peripheral side. The anode foil 5 and the cathode foil 7 are wound via the separator 6.

[0018] An element fixing tape 4 for winding the winding portion 2 is attached to the outer peripheral surface of the winding portion 2. As shown in FIG. 2(c), the element fixing tape 4 includes a resin layer 11 and an adhesive layer 12 laminated on one side of the resin layer 11. In the element fixing tape 4, the adhesive layer 12 adheres to the winding portion 2, and the resin layer 11 faces the outer peripheral side.

[0019] The resin layer 11 of the element fixing tape 4 contains titanium dioxide (TiO2). The resin constituting the resin layer 11 is not limited as long as it transmits ultraviolet rays and serves as a base material of the tape. As the resin constituting the resin layer 11, polyester resins such as polyethylene terephthalate, polyolefin resins such as polypropylene, polyphenylene sulfide, polyimide, polyetherimide, polyamide, and the like can be used. The resin containing titanium dioxide is formed into a film shape by, for example, stretching process and used as the base material of the element fixing tape 4. The content of titanium dioxide is 1 mass percent or more and 10 mass percent or less of the resin layer 11.

[0020] Here, the resin layer 11 may be transparent, but may be colored, for example, white, red, green, yellow, etc. As shown in FIG. 1, characters are marked on the resin layer 11 of the element fixing tape 4. In this example, on the resin layer 11 of the element fixing tape 4, a model number 15 and a manufacturing number 16 are marked as information for identifying the capacitor element 1. In this example, the manufacturing number 16 is a manufacturing lot number. The model number 15 and the manufacturing number 16 are marked in blue - black.

[0021] (Character Marking Device and Character Marking Method for Capacitor Elements) FIG. 3 is an explanatory diagram of a character marking device for capacitor elements. FIG. 4 is a flowchart of a character marking method for capacitor elements. As shown in FIG. 3, the character marking device 30 for capacitor elements includes an ultraviolet laser marker 32 that emits ultraviolet laser light 31 with a wavelength of 355 nm. Further, the character marking device 30 for capacitor elements includes a supply mechanism 33 that supplies the capacitor element 1 to a predetermined marking position M. No marks or characters are marked on the capacitor element 1 supplied to the marking position M.

[0022] The ultraviolet laser marker 32 includes, for example, a laser light output unit that generates and outputs ultraviolet laser light 31 based on excitation light, a laser scanning unit that scans the ultraviolet laser light 31, an input unit that receives input of marking data, and a marking control unit that controls the laser light output unit and the laser scanning unit based on the marking data to scan the ultraviolet laser light 31 on the surface of the workpiece supplied to the marking position M. Such an ultraviolet laser marker 32 is well - known.

[0023] The supply mechanism 33 only needs to be able to supply the capacitor element 1 to the marking position M in a posture where the outer peripheral surface of the winding portion 2 faces the light exit of the ultraviolet laser light 31 of the ultraviolet laser marker 32, and a well-known mechanism can be used. As shown in FIG. 4, as the supply mechanism 33, for example, a holding member 35 that detachably holds the lead terminal 3 of the capacitor element 1, an endless chain 36 to which a plurality of holding members 35 are fixed at equal intervals, a plurality of sprockets 37 over which the endless chain 36 is spanned, and a drive source (not shown) that drives the sprocket 37 are provided, and a transport mechanism that transports the capacitor element 1 along a transport path passing through the marking position M can be used. The supply mechanism 33 shown in FIG. 4 transports the capacitor element 1 in a state where the winding portion 2 is suspended downward. The capacitor element 1 is attached to and detached from the holding member 35 from below. In FIG. 4, the supply mechanism 33 passes through the marking position M while transporting the capacitor element 1 from the back side toward the front side. The supply mechanism 33 transports the capacitor element 1 intermittently.

[0024] As shown in FIG. 4, in the method for notating characters for a capacitor element, first, notation data for notating characters is input to the input portion of the ultraviolet laser marker 32 (step ST1). Next, the capacitor element 1 in which the winding portion 2 is wound by the element fixing tape 4 including the resin layer 11 containing titanium dioxide is supplied to the marking position M by the supply mechanism 33 (step ST2). The capacitor element 1 supplied to the marking position M is set in a posture where the outer peripheral surface of the element fixing tape 4 attached to the winding portion 2 faces the side of the light exit of the ultraviolet laser light 31 in the ultraviolet laser marker 32.

[0025] Next, the ultraviolet laser marker 32 scans the ultraviolet laser beam 31 on the element fixing tape 4 attached to the outer peripheral surface of the winding portion 2 based on the notation data (step ST3). Here, when titanium dioxide (TiO2) is irradiated with an ultraviolet laser beam, the titanium dioxide undergoes a color change. Therefore, when the ultraviolet laser beam 31 is scanned on the element fixing tape 4 based on the notation data, the titanium dioxide contained in the resin layer 11 changes color, and the model number 15 and the manufacturing number 16 are marked on the element fixing tape 4.

[0026] (Function and Effect) The character display device 30 for a capacitor element in this example includes a supply mechanism 33 that supplies the capacitor element 1 to the marking position, and an ultraviolet laser marker that irradiates the capacitor element 1 supplied to the marking position with an ultraviolet laser beam. The capacitor element 1 includes a winding portion 2 in which the anode foil 5 and the cathode foil 7 are wound via a separator 6, and an element fixing tape 4 that has a resin layer 11 and an adhesive layer 12 laminated on one side of the resin layer 11 and is attached to the outer peripheral surface of the winding portion 2 to wind and fix the winding portion 2. The resin layer 11 of the element fixing tape 4 contains titanium dioxide. The ultraviolet laser marker scans the ultraviolet laser beam on the resin layer 11 based on the notation data for representing characters, and changes the color of the titanium dioxide contained in the resin layer 11 to represent the characters.

[0027] Further, in this example, in a method for marking characters on a capacitor element 1 having a winding portion 2 in which an anode foil 5 and a cathode foil 7 are wound via a separator 6, and an element fixing tape 4 that has a resin layer 11 and an adhesive layer 12 laminated on one side of the resin layer 11 and is attached to the outer peripheral surface of the winding portion 2 to wind and fix the winding portion 2, titanium dioxide is previously contained in the resin layer 11, notation data for representing characters is input to the ultraviolet laser marker, the ultraviolet laser beam is scanned on the resin layer 11 based on the notation data, and the titanium dioxide contained in the resin layer 11 is changed in color to represent the characters.

[0028] According to this example, titanium dioxide is contained in the resin layer 11 of the element fixing tape 4 of the capacitor element 1. Therefore, based on the data for the notation where the ultraviolet laser marker 32 marks characters, by scanning the ultraviolet laser light 31 on the resin layer 11 of the element fixing tape 4 of the capacitor element 1, the titanium dioxide contained in the resin layer 11 can be discolored to mark information such as the model number 15 and the manufacturing number 16 on the element fixing tape 4. That is, this example does not involve cutting the resin layer 11 with laser light to engrave characters. Therefore, the element fixing tape 4 is not damaged. Thus, the winding portion 2 does not loosen due to damage or cutting of the element fixing tape 4. Also, since the characters turn into the color tone (blue - black) of the discolored titanium dioxide, the characters displayed on the element fixing tape 4 are easy to visually recognize. Furthermore, since this example does not use ink to print characters, in the manufacturing process of the electrolytic capacitor, it is not necessary to consider the compatibility between the ink and the electrolytic solution, or the influence of the ink on the electrical characteristics.

[0029] Moreover, according to the character display method of this example, it is easy to change the characters displayed on the capacitor element 1. Therefore, at the final stage of the manufacturing process of the aluminum electrolytic capacitor, the information can be flexibly marked in accordance with the model number 15 and the lot of the manufactured capacitor element 1. Also, this example does not involve attaching the element fixing tape 4 with pre - marked information to the winding portion 2. Therefore, at the final stage of the manufacturing of the capacitor element 1, information can be marked on the completed capacitor element 1. Thus, the capacitor element 1 and the information can be surely linked.

[0030] In this example, the characters marked on the capacitor element 1 represent the model number 15 and the manufacturing number 16. Therefore, the traceability of the capacitor element 1 is improved.

[0031] Note that in the above example, the titanium dioxide has turned blue - black, but it may also turn yellow, light yellow, silver - gray, light - gray, or blue - gray.

[0032] In addition, in the above example, the titanium dioxide has turned blue - black, but it may also turn yellow, light yellow, silver - gray, light - gray, or blue - gray.

Explanation of Reference Signs

[0033] 1... Capacitor element, 2... Winding part, 3... Lead terminal, 4... Element fixing tape, 5... Anode foil, 6... Separator, 7... Cathode foil, 11... Resin layer, 12... Adhesive layer, 15... Model number, 16... Manufacturing number, 30... Character marking device for capacitor element, 31... Ultraviolet laser light, 32... Ultraviolet laser marker, 33... Feeding mechanism, 35... Holding member, 36... Endless chain, 37... Sprocket

Claims

1. In a method for marking characters on a capacitor element having a wound body formed by winding an anode foil and a cathode foil with a separator interposed therebetween, and an element fixing tape having a resin layer and an adhesive layer laminated on one side of the resin layer and attached to the outer peripheral surface of the wound body to fix the wound body, titanium dioxide is contained in the resin layer, input marking data for marking characters with an ultraviolet laser marker, scan the ultraviolet laser light on the resin layer based on the marking data, and discolor the titanium dioxide contained in the resin layer to mark characters, which is a method for marking characters on a capacitor element.

2. The method for marking characters on a capacitor element according to claim 1, wherein the characters are a model number.

3. The method for marking characters on a capacitor element according to claim 1, wherein the characters are a manufacturing number.

4. a supply mechanism for supplying the capacitor element to a marking position, an ultraviolet laser marker for irradiating the capacitor element supplied to the marking position with ultraviolet laser light, the capacitor element includes a wound body formed by winding an anode foil and a cathode foil with a separator interposed therebetween, and an element fixing tape having a resin layer and an adhesive layer laminated on one side of the resin layer and attached to the outer peripheral surface of the wound body to fix the wound body, the resin layer contains titanium dioxide, the ultraviolet laser marker scans the ultraviolet laser light on the resin layer based on the marking data for marking characters, and discolors the titanium dioxide contained in the resin layer to mark characters, which is a device for marking characters on a capacitor element.

5. The device for marking characters on a capacitor element according to claim 4, wherein the characters are a model number.

6. The device for marking characters on a capacitor element according to claim 4, wherein the characters are a manufacturing number.

Images