Method and device for marking characters for aluminum electrolytic capacitor

Abstract

To propose a method for marking characters for a chip-type aluminum electrolytic capacitor, capable of marking colored characters on a case without using ink or a plate and without impairing the insulation of the case.SOLUTION: In a character display method, characters are displayed on a chip-type aluminum electrolytic capacitor 1 having a bottomed cylindrical case 3 that houses a wound portion 5 formed by winding an electrode foil, the case 3 including a metal case body 11 and a resin layer 12 that covers the outer peripheral surface of the case body 11, and the resin layer 12 containing titanium dioxide. When the characters are displayed, display data for displaying the characters is input into an ultraviolet laser marker 30, and ultraviolet laser light 31 is scanned over the resin layer 12 on the basis of the display data to display the characters by discoloring the titanium dioxide contained in the resin layer 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a character marking method for an aluminum electrolytic capacitor that marks characters on an aluminum electrolytic capacitor having a bottomed cylindrical case that houses a wound electrode foil, and also to a character marking device for an aluminum electrolytic capacitor that marks characters on an aluminum electrolytic capacitor having a bottomed cylindrical case that houses a wound electrode foil.

[0002] A method for manufacturing an aluminum electrolytic capacitor is described in Patent Document 1. In the method for manufacturing an aluminum electrolytic capacitor in the document, first, an anode foil that has been etched and oxide-film-formed, and a cathode foil that has been etched are wound with a separator between them to form a capacitor element. Next, the capacitor element is impregnated with an electrolyte and then housed in a cylindrical metal case with a bottom. Then, a seal is attached to the opening of the case, and the seal is fixed to the case by drawing. An anode terminal and a cathode terminal are formed on the outer end surface of the seal. These terminals are electrically connected to an anode tab terminal attached to the anode foil and a cathode tab terminal attached to the cathode foil, respectively, inside the case.

[0003] In the cited document 1, the case is formed by laminating an aluminum plate with polyethylene terephthalate or the like, and then drawing (extrusion molding). As a result, the case has an aluminum case body and a resin layer that covers the case body. The resin layer is an insulating layer that insulates the case. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-290083 A Summary of the Invention [Problem to be solved by the invention]

[0005] The case of an aluminum electrolytic capacitor is marked with information such as the manufacturer, capacitance, and rated voltage. Traditionally, such markings have been done by letterpress printing, in which ink is applied to a plate with reversed characters formed on it and the plate is pressed against the case. However, letterpress printing requires a separate plate for each character string to be printed. In addition, ink must be supplied to the plate when printing. Furthermore, a process is required in which the ink is dried after it is transferred from the plate to the case.

[0006] Here, if the characters are inscribed on the outer periphery of the case using a laser beam, there is no need to prepare a plate or ink, and there is no need for a process to dry the ink. However, when the case is engraved with a laser beam, the resin layer on the surface of the case is scraped off by the laser beam. This may impair the insulating function of the case provided by the resin layer. In addition, when the characters are engraved by scraping off the resin layer with a laser beam, there is a problem in that the characters are difficult to distinguish because there is no difference in color between the engraved characters and the resin layer.

[0007] In view of the above problems, an object of the present invention is to propose a method for marking characters on an aluminum electrolytic capacitor that can print colorful characters on the case without using ink or a plate and that does not impair the insulating properties of the case. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a cylindrical case with a bottom for accommodating a wound electrode foil. The present invention relates to a method for marking characters on an aluminum electrolytic capacitor, the case of which comprises a metal case body and a resin layer covering an outer peripheral surface of the case body, the method comprising the steps of: causing titanium dioxide to be contained in the resin layer; inputting marking data for marking the characters into an ultraviolet laser marker; scanning the resin layer with an ultraviolet laser light based on the marking data; and marking the characters by discoloring the titanium dioxide contained in the resin layer.

[0009] According to the present invention, the case of the aluminum electrolytic capacitor has a resin layer on the surface. The resin layer contains titanium dioxide. When titanium dioxide (TiO2) is irradiated with ultraviolet laser light, the titanium dioxide undergoes color modulation. Therefore, by irradiating the resin layer with ultraviolet laser light using 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 surface of the case. According to the present invention, unlike the case where characters are printed on the case by letterpress printing, it is not necessary to prepare a plate for each character string, and characters can be changed by changing the display data. Therefore, the characters to be displayed on the case can be flexibly changed. Also, unlike letterpress printing, when displaying characters, it is not necessary to provide a process of supplying ink to the plate or drying the ink transferred to the case. Furthermore, since the present invention does not engrave characters by scraping the resin layer with laser light, the resin layer of the case is not damaged. Therefore, the insulation properties of the case can be maintained. Also, since the characters have the color of the discolored titanium dioxide, the characters displayed on the surface of the case are easy to see.

[0010] In the present invention, the characters may represent the capacitance and the rated voltage, so that the specifications of the aluminum electrolytic capacitor can be written on the case.

[0011] In the present invention, the characters may be a manufacturing number. Here, in the present invention, the characters to be displayed on the case can be flexibly changed by the notation data inputted into the ultraviolet laser marker. This makes it possible to inscribe the manufacturing number on the case in the final stage of the manufacturing process of the aluminum electrolytic capacitor. Here, by displaying the manufacturing number on the case, it is possible to improve the traceability of each manufactured aluminum electrolytic capacitor.

[0012] In the present invention, the resin layer may be a laminate layer.

[0013] In the present invention, the resin layer may be a heat shrink tube.

[0014] Next, a character marking device for an aluminum electrolytic capacitor of the present invention comprises a supply mechanism which supplies an aluminum electrolytic capacitor to a marking position, and an ultraviolet laser marker which irradiates ultraviolet laser light onto the aluminum electrolytic capacitor supplied to the marking position, wherein the aluminum electrolytic capacitor has a bottomed cylindrical case which houses a wound electrode foil, the case comprising a metal case body and a resin layer which covers the outer peripheral surface of the case body, the resin layer containing titanium dioxide, and the ultraviolet laser marker scans the resin layer with the ultraviolet laser light based on marking data for marking characters, and marks the characters by discoloring the titanium dioxide contained in the resin layer.

[0015] In the character marking device for aluminum electrolytic capacitors of the present invention, the supply mechanism supplies, to a marking position, an aluminum electrolytic capacitor having a resin layer containing titanium dioxide on the surface of the case. The ultraviolet laser marker scans the resin layer of the case of the aluminum electrolytic capacitor at the marking position with an ultraviolet laser beam based on marking data for marking characters. Thus, the character marking device for aluminum electrolytic capacitors can change the color of the titanium dioxide contained in the resin layer to mark desired characters on the surface of the case. According to the above-mentioned device, unlike the case where characters are printed on a case by letterpress printing, it is not necessary to prepare a plate for each character string, and characters can be changed by changing the notation data. Therefore, the characters to be inscribed on the case can be flexibly changed. Also, unlike letterpress printing, when inscribing characters, it is not necessary to provide a process of supplying ink to the plate or drying the ink transferred to the case. Furthermore, since the present invention does not engrave characters by scraping a resin layer with laser light, the resin layer of the case is not damaged. Therefore, the insulating properties of the case can be maintained. Also, since the characters have the color of discolored titanium dioxide, the characters displayed on the surface of the case are easy to see.

[0016] In the present invention, the characters may represent the capacitance and the rated voltage, so that the specifications of the aluminum electrolytic capacitor can be written on the case.

[0017] In the present invention, the characters may be a manufacturing number. Here, in the present invention, the characters to be displayed on the case can be flexibly changed by the notation data inputted into the ultraviolet laser marker. This makes it possible to inscribe the manufacturing number on the case in the final stage of the manufacturing process of the aluminum electrolytic capacitor. Here, by displaying the manufacturing number on the case, it is possible to improve the traceability of each manufactured aluminum electrolytic capacitor.

[0018] In the present invention, the resin layer may be a laminate layer.

[0019] In the present invention, the resin layer may be a heat shrink tube. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is an explanatory diagram of a chip-type aluminum electrolytic capacitor. [Diagram 2] FIG. 2 is a partial cross-sectional view of a case of an aluminum electrolytic capacitor. [Diagram 3] FIG. 2 is an explanatory diagram of a character marking device for an aluminum electrolytic capacitor. [Figure 4] 1 is a flowchart of a method for marking aluminum electrolytic capacitors. [Diagram 5] FIG. 1 is an explanatory diagram of a lead-type aluminum electrolytic capacitor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a current collector plate-attached electrode foil braking device to which the present invention is applied will be described with reference to the drawings.

[0022] (Chip-type aluminum electrolytic capacitors) Fig. 1 is an external perspective view of the chip-type aluminum electrolytic capacitor, and Fig. 2 is a cross-sectional view of the chip-type aluminum electrolytic capacitor.

[0023] As shown in FIG. 1 and FIG. 2, the chip-type aluminum electrolytic capacitor 1 includes a capacitor element 2, a cylindrical case 3 with a bottom that houses the capacitor element 2, and a base plate 4 on which the case 3 is placed. As shown in FIG. 2, the capacitor element 2 includes a winding section 5 formed by winding an anode foil (electrode foil) and a cathode foil (electrode foil) into a cylindrical shape with a separator sandwiched therebetween, and two lead terminals 6 that are drawn out from the anode foil and the cathode foil and protrude from the winding section 5. The capacitor element 2 is housed in the case 3 after the winding section 5 is impregnated with an electrolyte. The opening of the case 3 is sealed with a sealing body 7 having elasticity such as rubber. The lead terminals 6 are drawn downward from through holes 8 provided in the sealing body 7 and through holes 9 provided in the base plate 4, and then bent, and are extended along grooves 10 provided on the bottom surface of the base plate 4 from each through hole 8 toward the outer periphery of the base plate 4.

[0024] The case 3 includes a metal case body 11 and a resin layer 12 that covers the outer peripheral surface of the case body 11. The case body 11 includes a cylindrical portion 13 and a circular top plate portion 14 that closes the upper end opening of the cylindrical portion 13. In this example, the case body 11 is made of aluminum. The resin layer 12 The resin layer 12 covers the outer peripheral surface of the cylindrical portion 13 and the upper surface of the top plate portion 14. In this example, the resin layer 12 is polyethylene terephthalate containing titanium dioxide. The case 3 is formed by laminating an aluminum plate material with polyethylene terephthalate containing titanium dioxide, and then drawing the laminate. Therefore, the resin layer 12 is a laminate layer. The resin layer 12 is translucent.

[0025] Here, the resin constituting the resin layer 12 is not limited as long as it contains titanium dioxide, can be laminated, and transmits ultraviolet light. Examples of the resin constituting the resin layer 12 include polyester resins such as polyethylene terephthalate, polyolefin resins such as polyethylene and polypropylene, and polyamide. Titanium dioxide is incorporated into the resin in advance for lamination. The content of titanium dioxide in the resin layer 12 is 1 mass percent or more and 10 mass percent or less.

[0026] As shown in FIG. 1, a mark 21 indicating the polarity of the lead terminal 6, a product name 22, a capacitance 23, and a rated voltage 24 are marked on the top surface of the case 3. In this example, the mark 21 indicates that the lead terminal 6 located below the mark 21 is the cathode. In addition, a serial number 25 is marked on the top surface of the case 3. In this example, the serial number 25 is a manufacturing lot number. The mark 21 indicating the polarity, the product name 22, the capacitance 23, the rated voltage 24, and the serial number 25 are blue-black in color.

[0027] (Aluminum electrolytic capacitor character marking device and aluminum electrolytic capacitor character marking method) Fig. 3 is an explanatory diagram of a character marking device for an aluminum electrolytic capacitor. Fig. 4 is a flowchart of a character marking method for an aluminum electrolytic capacitor. As shown in Fig. 3, a character marking device 29 for an aluminum electrolytic capacitor includes an ultraviolet laser marker 30 that emits an ultraviolet laser light 31 having a wavelength of 355 nm. The character marking device 29 for an aluminum electrolytic capacitor also includes a supply mechanism 32 that supplies a chip-type aluminum electrolytic capacitor 1 to a predetermined marking position A. The chip-type aluminum electrolytic capacitor 1 supplied to the marking position A has no marks or characters marked thereon.

[0028] The ultraviolet laser marker 30 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 accepts input of notation data, and a marking control unit that controls the laser light output unit and the laser light scanning unit based on the notation data to scan the ultraviolet laser light 31 over the surface of a workpiece supplied to the marking position A. Such an ultraviolet laser marker 30 is well known.

[0029] The supply mechanism 32 may be any known mechanism as long as it is capable of supplying the chip type aluminum electrolytic capacitors 1 to the marking position A with the top surface of the case 3 facing toward the emission port of the ultraviolet laser light 31 of the ultraviolet laser marker 30. The supply mechanism 32 may, for example, include a pallet on which multiple chip type aluminum electrolytic capacitors 1 are placed with the top surface of the case 3 facing upward, and a transport mechanism that transports the pallet along a transport path that passes through the marking position A.

[0030] As shown in Fig. 4, in the method for marking characters on an aluminum electrolytic capacitor, first, marking data for marking a mark 21 indicating polarity, a product name 22, a capacitance 23, a rated voltage 24, and a serial number 25 is input into an input section of an ultraviolet laser marker 30 (step ST1). Next, a chip-type aluminum electrolytic capacitor 1 having a cylindrical case 3 with a bottom, the case 3 comprising a metal case body 11 and a resin layer 12 covering the outer peripheral surface of the case body 11, the resin layer 12 containing titanium dioxide, is supplied to a marking position A by a conveying mechanism (not shown) (step ST2). The chip-type aluminum electrolytic capacitor supplied to the marking position A 1 is oriented such that the upper surface of the case 3 faces the emission port of the ultraviolet laser light 31 of the ultraviolet laser marker 30.

[0031] Next, the ultraviolet laser marker 30 scans the upper surface (resin layer 12) of the case 3 with ultraviolet laser light 31 based on the notation data (step ST3). When titanium dioxide (TiO2) is irradiated with ultraviolet laser light, the titanium dioxide undergoes color modulation. Therefore, when the ultraviolet laser light 31 is scanned over the upper surface (resin layer 12) of the case 3 based on the notation data, the titanium dioxide contained in the resin layer 12 changes color, and the mark 21 indicating polarity, the product name 22, the capacitance 23, the rated voltage 24, and the serial number 25 are displayed on the upper surface of the case 3.

[0032] (Action and effect) The character display device 29 for aluminum electrolytic capacitors in this example includes a supply mechanism 32 that supplies a chip-type aluminum electrolytic capacitor 1 to a marking position A, and an ultraviolet laser marker that irradiates an ultraviolet laser beam 31 onto the chip-type aluminum electrolytic capacitor 1 supplied to the marking position A. The chip-type aluminum electrolytic capacitor 1 supplied to the marking position A has a bottomed cylindrical case 3 that houses a wound part 5 formed by winding an electrode foil, the case 3 including a metal case body 11 and a resin layer 12 that covers the outer peripheral surface of the case body 11, the resin layer 12 containing titanium dioxide. The ultraviolet laser marker 30 scans the resin layer 12 with an ultraviolet laser beam 31 based on marking data for marking characters, and discolors the titanium dioxide contained in the resin layer 12 to mark the characters.

[0033] Furthermore, in the character display method of this example, characters are displayed on a chip-type aluminum electrolytic capacitor 1 having a bottomed cylindrical case 3 that houses a wound portion 5 formed by winding an electrode foil, the case 3 including a metal case body 11 and a resin layer 12 that covers the outer peripheral surface of the case body 11, and the resin layer 12 containing titanium dioxide. When displaying the characters, display data for displaying the characters is input into an ultraviolet laser marker 30, and ultraviolet laser light 31 is caused to scan over the resin layer 12 based on the display data.

[0034] According to this example, titanium dioxide is preliminarily contained in the resin layer 12 of the case 3 of the chip-type aluminum electrolytic capacitor 1. Therefore, by scanning the case 3 (resin layer 12) of the aluminum electrolytic capacitor 1 with ultraviolet laser light 31 using an ultraviolet laser marker 30 based on marking data for marking characters, the titanium dioxide contained in the resin layer 12 is discolored, making it possible to mark the desired character strings 22-25 on the surface of the case 3.

[0035] According to this example, unlike the case where the character strings 22-25 are printed on the case 3 by letterpress printing, it is not necessary to prepare a plate for each character string 22-25, and the character strings 22-25 can be changed by changing the notation data. Therefore, the character strings 22-25 to be inscribed on the case 3 can be flexibly changed. Also, unlike letterpress printing, when inscribing the character strings 22-25, it is not necessary to provide a process of supplying ink to the plate or drying the ink transferred to the case 3. Furthermore, since this example does not inscribe the character strings 22-25 by scraping the resin layer 12 with a laser beam, the resin layer 12 of the case 3 is not damaged. Therefore, the insulation properties of the case 3 can be maintained. Also, since the character strings 22-25 have the color of discolored titanium dioxide (blue-black), the characters displayed on the surface of the case 3 are easy to see.

[0036] In this example, capacitance 23 and rated voltage 24 are written in case 3. That is, the specifications of chip-type aluminum electrolytic capacitor 1 are written in case 3.

[0037] In this example, the serial number 25 is written on the case 3. In this example, the serial number 25 is a manufacturing lot number. Here, according to the character display method of this example, the characters to be displayed on the case 3 are It is easy to change the serial number 25. Therefore, it is possible to mark the case 3 with the serial number 25 in the final stage of the manufacturing process of the aluminum electrolytic capacitor. Here, by marking the serial number 25 on the case 3 of the chip-type aluminum electrolytic capacitor 1, the traceability of each manufactured chip-type aluminum electrolytic capacitor 1 can be improved.

[0038] In the above example, the character strings 22 to 25 are written on the top surface of the case 3, but they may be written on the side surface of the case 3. Also, in the above example, the titanium dioxide turns blue-black, but it may also turn yellow, light yellow, silver gray, light gray, or blue-gray.

[0039] (Other embodiments) FIG. 5 is a perspective view of a lead-type chip-type aluminum electrolytic capacitor. As shown in FIG. 5, a lead-type chip-type aluminum electrolytic capacitor 51 includes a capacitor element 2 and a bottomed cylindrical case 3 that houses the capacitor element 2. The capacitor element 2 includes, like the chip-type aluminum electrolytic capacitor 1, a winding section 5 formed by winding an anode foil (electrode foil) and a cathode foil (electrode foil) into a cylindrical shape with a separator sandwiched therebetween, and two lead terminals 6 drawn out from the anode foil and the cathode foil, respectively, and protruding from the winding section 5. The capacitor element 2 is housed in the case 3 after the winding section 5 is impregnated with an electrolyte. The opening of the case 3 is sealed by a sealing body. The lead terminals 6 are drawn downward from through holes provided in the sealing body.

[0040] The case 3 includes a metal case body 11 and a resin layer 12 that covers the outer peripheral surface of the case body 11. The case body 11 includes a cylindrical portion 13 and a circular top plate portion 14 that closes the upper end opening of the cylindrical portion 13. The case body 11 is made of aluminum. The resin layer 12 covers the outer peripheral surface of the cylindrical portion 13 and the outer peripheral edge portion of the top plate portion 14. The case 3 is formed by drawing an aluminum plate. The resin layer 12 is formed by covering the surface of the case body 11 after the capacitor element 2 is housed in the case body 11 and sealed with a sealing body, by covering the case body 11 with a heat shrink tube made of a resin containing titanium dioxide, and applying heat. The resin layer 12 may be colored white, gray, or the like.

[0041] There are no limitations on the resin constituting the resin layer 12, so long as it contains titanium dioxide, can be processed into a heat shrink tube, and transmits ultraviolet light. Examples of the resin constituting the resin layer 12 include polyethylene, polypropylene, polyvinyl chloride, fluororesin, and polyethylene terephthalate. Titanium dioxide is incorporated into the resin before processing and molding these resin materials into a heat shrink tube. The content of titanium dioxide is 1 mass percent or more and 10 mass percent or less of the resin layer 12.

[0042] A product name 22, a capacitance 23, and a rated voltage 24 are written on the side of the case 3. In addition, a serial number 25 is written on the side of the case 3. The product name 22, the capacitance 23, the rated voltage 24, and the serial number 25 are in a blue-black color. In the lead-type chip-type aluminum electrolytic capacitor 51, the polarity of the lead terminals 6 can be determined by the length of the lead terminals 6.

[0043] (Aluminum electrolytic capacitor character marking device and aluminum electrolytic capacitor character marking method) When marking the character strings 22-25 on the case 3 of the lead type chip type aluminum electrolytic capacitor 51, a character display device 29 for aluminum electrolytic capacitors is used, which is the same as that used when marking the character strings 22-25 on the chip type aluminum electrolytic capacitor 1. That is, as shown in Fig. 3, the character display device 29 for aluminum electrolytic capacitors includes a supply mechanism 32 that supplies the lead type chip type aluminum electrolytic capacitor 51 to the marking position A, and an ultraviolet laser marker 30 that irradiates the marking position A with ultraviolet laser light 31 having a wavelength of 355 nm. In this example, the supply mechanism 32 supplies the lead type chip type aluminum electrolytic capacitor 51 to the marking position A in a posture laid on its side.

[0044] 4, in the method for marking characters on an aluminum electrolytic capacitor, first, marking data for marking product name 22, capacitance 23, rated voltage 24, and serial number 25 is input into ultraviolet laser marker 30 (step ST1). Next, lead-type chip-type aluminum electrolytic capacitor 51 is supplied to marking position A, and the side surface of case 3 is oriented so as to face the emission port of ultraviolet laser light 31 in ultraviolet laser marker 30 (step ST2).

[0045] Thereafter, the ultraviolet laser marker 30 scans the side surface (resin layer 12) of the case 3 with ultraviolet laser light 31 based on the description data (step ST3). When titanium dioxide (TiO2) is irradiated with ultraviolet laser light, the titanium dioxide undergoes color modulation. Therefore, when the ultraviolet laser light 31 is scanned over the side surface (resin layer 12) of the case 3 based on the description data, the titanium dioxide contained in the resin layer 12 changes color, and the product name 22, capacitance 23, rated voltage 24, and serial number 25 are displayed.

[0046] In this example as well, the same effects as those in the above example can be obtained.

[0047] The character marking method of this example is applicable to chip-type aluminum electrolytic capacitor 1 whose case 3 is provided with resin layer 12. For example, it is applicable when marking characters on the case of a board-supported chip-type aluminum electrolytic capacitor and a screw-terminal type chip-type aluminum electrolytic capacitor. [Explanation of symbols]

[0048] 1...chip-type aluminum electrolytic capacitor, 2...capacitor element, 3...case, 4...base plate, 5...winding portion, 6...lead terminal, 7...sealing body, 8...through hole, 9...through hole, 10...groove, 11...case body, 12...resin layer, 13...cylindrical portion, 14...top plate portion, 21...mark, 22...product name, 23...capacitance, 24...rated voltage, 25...serial number, 29...character marking device for aluminum electrolytic capacitor, 30...ultraviolet laser marker, 31...ultraviolet laser light, 32...supply mechanism, 51...lead-type chip-type aluminum electrolytic capacitor

Claims

1. 1. A method for marking characters on an aluminum electrolytic capacitor, the aluminum electrolytic capacitor having a cylindrical case with a bottom that houses a wound electrode foil, the case comprising a metal case body and a resin layer covering an outer peripheral surface of the case body, the method comprising: The resin layer contains titanium dioxide, a marking method for marking characters on an aluminum electrolytic capacitor, comprising: inputting marking data for marking the characters into an ultraviolet laser marker; scanning the resin layer with an ultraviolet laser light based on the marking data; and marking the characters by discoloring the titanium dioxide contained in the resin layer.

2. 2. The method for marking an aluminum electrolytic capacitor according to claim 1, wherein the characters indicate a capacitance and a rated voltage.

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

4. 2. The method for marking characters for an aluminum electrolytic capacitor according to claim 1, wherein the resin layer is a laminate layer.

5. 2. The method for marking characters for an aluminum electrolytic capacitor according to claim 1, wherein the resin layer is a heat shrinkable tube.

6. a supply mechanism for supplying the aluminum electrolytic capacitor to a marking position; an ultraviolet laser marker that irradiates the aluminum electrolytic capacitor supplied to the marking position with ultraviolet laser light, The aluminum electrolytic capacitor has a bottomed cylindrical case that houses a wound electrode foil, the case includes a metal case body and a resin layer that covers an outer peripheral surface of the case body, and the resin layer contains titanium dioxide. The ultraviolet laser marker is a character marking device for an aluminum electrolytic capacitor, characterized in that the ultraviolet laser marker scans the resin layer with the ultraviolet laser light based on marking data for marking characters, and marks the characters by discoloring the titanium dioxide contained in the resin layer.

7. 7. The character marking device for an aluminum electrolytic capacitor according to claim 6, wherein the characters indicate a capacitance and a rated voltage.

8. 7. The character marking device for an aluminum electrolytic capacitor according to claim 6, wherein the characters are a manufacturing number.

9. 7. The character marking device for an aluminum electrolytic capacitor according to claim 6, wherein the resin layer is a laminate layer.

10. 7. The character marking device for an aluminum electrolytic capacitor according to claim 6, wherein the resin layer is a heat shrinkable tube.

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