Ultraviolet radiation device

Abstract

To provide a radiation device which can use an LED highly efficiently.SOLUTION: A radiation device 1 includes: a long equipped substrate 15; a plurality of LEDs 3 equipped along a longer direction of the equipped substrate 15 at intervals; and a lighting circuit 11 for lighting up the LEDs 3. The nominal power of the LEDs 3 is at least 1 W and the lighting circuit 11 supplies smaller currents than the nominal power of the LEDs 3 to the LEDs 3.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an ultraviolet irradiation device that uses an LED for emitting ultraviolet light as a light source. [Background technology]

[0002] 2. Description of the Related Art Conventionally, black light fluorescent lamps that emit near-ultraviolet rays with strong fluorescent effects have been available for use in decoration, authentication of banknotes and antiques, curing of resins and inks, and the like (for example, Patent Document 1). Meanwhile, in recent years, due to growing environmental awareness, lighting devices using LEDs, which have excellent power saving properties, as a light source have become widespread, and linear light sources that use LEDs as an alternative to conventional ultraviolet lamps (e.g., Patent Document 2) and ultraviolet irradiation devices that have functions similar to black light fluorescent lamps and use LEDs have been proposed (e.g., Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-283570 [Patent Document 2] JP 2014-194913 A, paragraph 32 [Patent Document 3] JP 2013-114875 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Documents 2 and 3, the use of LEDs as ultraviolet irradiation devices is proposed, but there is no specific proposal for a device that can be used as a replacement for conventional black lights. On the other hand, there is also a demand for using LEDs (irradiation devices) with high efficiency. In view of the above problems, an object of the present invention is to provide an illumination device that can use LEDs with high efficiency. [Means for solving the problem]

[0005] In the present invention, the rated power of the LED is 1 W or more, and the lighting circuit supplies to the LED a current that is lower than the rated current of the LED. Effect of the Invention

[0006] According to the present invention, LEDs can be used with high efficiency. [Brief description of the drawings]

[0007] [Figure 1] 1 is an external perspective view of an ultraviolet irradiation device according to an embodiment; [Diagram 2] FIG. 2 is an exploded perspective view of the ultraviolet irradiation device according to the embodiment. [Diagram 3] FIG. 2 is a vertical cross-sectional view of an end portion of the ultraviolet irradiation device according to the embodiment. [Figure 4] 3 is a cross-sectional view of an end portion of the ultraviolet irradiation device according to the embodiment. FIG. [Diagram 5] FIG. 11 is a cross-sectional view of an end portion of an ultraviolet irradiation device according to a modified example. [Figure 6] FIG. 11 is a cross-sectional view of an end portion of an ultraviolet irradiation device according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] <Summary> In an ultraviolet irradiation device according to one aspect of the present invention, a current lower than a rated current of an LED that irradiates ultraviolet light is supplied to the LED. An ultraviolet irradiation device according to one embodiment of the specification has a long mounting board and a plurality of LEDs mounted at intervals along the longitudinal direction of the mounting board, the LEDs emitting ultraviolet light having a peak wavelength in the range of 365 to 405 nm, the LEDs having a rated power of 1 W or more, and being supplied with a current lower than the rated current. An ultraviolet irradiation device according to one embodiment of the specification has a plurality of LEDs that emit ultraviolet light mounted on a mounting board and is long in a first direction, the LEDs are mounted at intervals of 50 mm to 150 mm along the first direction, and in addition to the LEDs, the mounting board also has mounted thereon LEDs that emit blue light, LEDs that emit white light based on blue light, or LEDs that emit white light. An ultraviolet irradiation device according to one embodiment of the specification has a plurality of LEDs that emit ultraviolet light mounted on a mounting substrate, the mounting substrate having a long strip shape extending in a first direction, and the LEDs are mounted at intervals of 50 mm to 150 mm in the longitudinal direction of the mounting substrate. In another embodiment of the ultraviolet irradiation device of the present specification, a base member is provided at both ends in the first direction for detachably mounting to a lighting fixture to which a straight tube black light using a fluorescent lamp can be attached. In an illumination device according to one aspect of the present specification, a current lower than the rated current of a plurality of LEDs is supplied to the plurality of LEDs. In an irradiation device according to another embodiment of the present specification, the low current is 60% or less of the rated current. In the irradiation device according to another embodiment of the specification, the LED irradiates ultraviolet light, and the LED has a rated current of 1 W or more. An ultraviolet irradiation device according to one embodiment of the specification includes a housing having a cylindrical exterior shape and composed of a translucent cover having a C-shaped cross section and a bow-shaped base member that covers an opening of the translucent cover, an LED module having a plurality of LEDs that emit ultraviolet light mounted on a mounting board and housed within the housing, a base member attached to an end of the housing, and a lighting circuit that receives power from the base member to light up the LED module. In the ultraviolet irradiation device according to another embodiment of the specification, the mounting board has a long strip shape extending in the longitudinal direction of the housing, and the LEDs are mounted on the mounting board at intervals of 50 mm to 150 mm in the longitudinal direction. In the ultraviolet irradiation device according to another embodiment of the present specification, the lighting circuit supplies a current of 200 mA to 400 mA to the LED.

[0009] <Embodiment> Hereinafter, the embodiments will be described in detail with reference to the drawings. 1. Overall structure The ultraviolet irradiation device 1 has an LED module 5 equipped with an LED 3 that irradiates ultraviolet light, a base member 7 for mounting the LED module 5, a cover member 9 for covering the LED module 5, a lighting circuit 11 for causing the LED 3 to emit light, and a base member 13 for receiving commercial power from the socket. Specifically, the ultraviolet irradiation device 1 has a straight tube shape. The ultraviolet irradiation device 1 includes a housing 6 having a cylindrical external shape and composed of a cover member 9 having a "C"-shaped cross section and a bow-shaped base member 7 that closes the opening of the "C" of the cover member 9, an LED module 5 having a plurality of LEDs 3 mounted on a mounting board 15 and housed in the housing 6, a base member 13 attached to an end of the housing 6, and a lighting circuit 11 for receiving power from the base member 13 to light up the LED module 5.

[0010] 2.Each part configuration (1) LED module 5 2, the LED module 5 has an elongated mounting board 15 and a plurality of LEDs 3 mounted at intervals along the longitudinal direction of the mounting board 15. The mounting board 15 has a wiring pattern (not shown) consisting of a mounting pattern for mounting the plurality of LEDs 3 in a predetermined connection form and a terminal pattern for connecting the mounting pattern to the lighting circuit 11. In the mounting substrate 15, the side on which the LEDs 3 are mounted is referred to as the front side, and the side on which the LEDs 3 are not mounted is referred to as the back side. Since the cover member 9 described later has a diffusion groove 35, the ultraviolet rays (having a wavelength in the range of 365 [nm] to 405 [nm]) emitted from the LEDs 3 are easily diffused uniformly, and the pitch of the LEDs 3 mounted on the mounting board 15 can be increased. Specifically, the pitch of the LEDs 3 can be expanded to 50 [mm] to 120 [mm]. In this case, although the LEDs 3 have a grainy appearance when lit, the half-value angle of the LEDs 3 is about 120 [degrees], and the irradiated surface in normal use is more than 100 [mm] away from the LEDs 3, so that it can be used without any practical problems. Note that the indications A to B that define the range refer to a range between A and B.

[0011] (2) Base member 7 The following description will be given mainly with reference to FIG. 2 and FIG. The base member 7 has an elongated shape. The base member 7 is combined with the cover member 9 to form a cylinder that functions as a housing. The cross-sectional shape of the base member 7 is constant in the longitudinal direction. The cross-sectional shape of the base member 7 resembles an arch. As shown in FIG. 4, the base member 7 has a base body 17 having a bow-like shape, a module mounting means 19 for mounting the LED module 5, and a cover mounting means 21 for mounting the cover member 9. The base body 17 has a screw hole 23 at its end for mounting the mouthpiece member 13. The screw hole 23 extends parallel to the longitudinal direction of the base body 17.

[0012] The module mounting means 19 is provided on the opposite side to the arc surface of the base body 17. The module mounting means 19 is configured with a locking structure that locks an end of the mounting substrate 15 of the LED module 5 in the short side direction. The locking structure for the module has, in a state where the LED module 5 is placed at a predetermined position on the base body 17, standing portions 25 standing from both ends in the short direction of the mounting board 15 of the LED module 5, and protruding portions 27 protruding from the standing portions 25 to the surface of the mounting board 15. The LED module 5 is attached to the base member 7 by being inserted from an end face of the base member 7 into the space formed between the base body 17 and the protruding portions 27.

[0013] The cover mounting means 21 is provided on the opposite side to the arcuate surface of the base body 17. The cover mounting means 21 is configured with a locking structure that locks the bent portion (opening side end) 29 of the cover member 9.

[0014] The locking structure for the cover utilizes the locking structure for the module. The locking structure for the cover is configured with a bent portion 31 that bends from the upright tip of the upright portion 25 to the side opposite to the side where the LED module 5 is present. The bent tip of the bent portion 31 has a circular shape in cross section. The bent portion 29, which is the open end of the cover member 9, engages with the space between the bent portion 31 and the base body 17. The cover member 9 is attached to the base member 7 by being inserted between the base body 17 and the bent portion 31 from the longitudinal end face of the base member 7.

[0015] The base body 17 is configured so that the angle between the circumferential edge of the base body 17 and the center of the cylinder combined with the cover member 9 is within a range of 70 degrees to 120 degrees, and preferably within a range of 80 degrees to 110 degrees. This allows the distance between the LED 3 and the cover member 9 to be increased. Furthermore, by increasing the distance between the LED 3 and the cover member 9, deterioration of the cover member 9 due to ultraviolet rays is suppressed. In the cross section of the ultraviolet irradiation device 1, the angle between the imaginary line connecting the upright tip of one of the upright parts 25 and the center of the surface of the LED 3 of the LED module 5 and the imaginary line connecting the upright tip of the other upright part 25 and the center of the surface of the LED 3 of the LED module 5 (the angle including the main emission direction of the light of the LED 3) is larger than the half-value angle of the LED 3. Specifically, it is sufficient if it is in the range of 0[degree] to 50[degree] with respect to the half-value angle of the LED 3. Preferably, it is sufficient if it is in the range of 20[degree] to 40[degree] with respect to the half-value angle of the LED 3. By setting it in this range, it is possible to prevent the shadow of the upright part 25 from appearing on the ultraviolet irradiation device 1 during irradiation.

[0016] (3) Cover member The following description will be given mainly with reference to FIG. 2 and FIG. The cover member 9 is elongated. The cross-sectional shape of the cover member 9 is constant in the longitudinal direction. The cover member 9 has an opening on the lower side, and is shaped like a circular cylinder with the lower part cut out. The end of the cover member 9 facing the opening (the opening side end) is a bent part 29 that faces the center of a cylinder with the lower part notched. The cover member 9 is attached to the base member 7 by inserting the bent portion 29 from an end face of the base member 7 into the space formed between the base main body 17 and the bent portion 31. Since the bent portion 29 extends toward the center of the cylinder and the bent tip of the bent portion 31 of the base member 7 has a circular shape, it is possible to prevent the cover member 9 from coming off the base member 7.

[0017] The cover member 9 has a diffusion groove 35 on its inner circumferential surface, which extends in the longitudinal direction of the cover member 9 in cross section. A plurality of diffusion grooves 35 are formed at equal intervals in the circumferential direction. The depth of the diffusion groove 35 is within a range of 0.1 mm to 0.5 mm, and the cross section of the diffusion groove 35 is "V" shaped with an angle within a range of 1.2° to 3.8°. This diffuses the light emitted from the LED 3. The cover member 9 is made of an acrylic resin with high ultraviolet transmittance (for example, Paraglass, product name, UV00, manufactured by Kuraray Co., Ltd.). Note that a cover made of acrylic resin mixed with diffusing particles such as silicone microparticles (a so-called milky white cover) does not transmit ultraviolet rays, so the above-mentioned diffusion groove 35 is effective.

[0018] (4) Lighting circuit The description will be given mainly with reference to FIGS. The lighting circuit 11 converts commercial power received via the base member 13 into DC power and supplies the DC power to the LED module 5. The lighting circuit 11 has, for example, a rectifier circuit, a smoothing circuit, an electric conversion circuit, and the like. The electronic components 37 that constitute the lighting circuit 11 are mounted on a circuit board 39. In the drawing, only a capacitor appears as the electronic component 37. The lighting circuit 11 is housed in a base member 13. The fixing of the lighting circuit 11 will be described later. The lighting circuit 11 is configured to supply a current of 200 mA to 400 mA to the LED 3 (the power of the LED 3 in this case is 0.7 W to 2.0 W). This improves the radiation intensity of the ultraviolet light emitted from the LED 3. Furthermore, since the radiation intensity can be improved, the pitch of the LEDs 3 can be increased, and the number of LEDs 3 used can be reduced. In particular, high efficiency is achieved because a current lower than the rated current is supplied to the high-output type LED 3. Note that the "high-output type" here refers to a rated power of 1 W or more. High-output type LEDs have large chips and are highly efficient, which further improves the light extraction efficiency.

[0019] (5) Cap member 13 The base member 13 is configured to be freely attached to a socket of the device body to which a current black light fluorescent lamp is detachably attached. The base member 13 includes a resin-made bottomed cylinder 45 having a bottom wall 41 and a cylinder wall 43, and a base pin 47 provided on the bottom wall 41 of the bottomed cylinder 45. The base pin 47 here is a G type. The bottomed cylinder 45 is also black in color. This makes it easier to recognize that the ultraviolet ray irradiation device is a black light. The ferrule pin 47 includes a base portion 49 disposed inside the bottomed cylinder 45 and attached to the bottom wall 41, and a pin portion 51 extending outward from the bottom wall 41. There are two pin portions 51, and the two pin portions 51 extend from one base portion 49. The bottomed cylinder 45 has a step 43a in the cylinder wall 43. The step 43a is provided at least closer to the opening side than the base portion 49 of the base pin 47. The step 43a is a step whose diameter increases on the opening side. The cylinder wall 43 has an attachment means 53 for attaching the base member 13 to the base member 7 on the side where the base member 7 exists in the ultraviolet irradiation device 1.

[0020] Here, a screw member 55 is used to attach the base member 7 of the mouth member 13. For this reason, the cylindrical wall 43 has an attachment recess 57 for attaching the screw member 55, and the portion through which the screw member 55 is inserted is made thicker. A boss portion 59 extending to the position of the step 43a is provided on the bottom wall 41. The boss portion 59 is provided with a screw hole. The circuit board 39 of the lighting circuit 11 has a shape corresponding to the inner circumferential surface of the cylindrical wall 43, and when the lighting circuit 11 is inserted from the opening of the bottomed cylindrical body 45, the peripheral edge of the circuit board 39 abuts against the step 43a. In this state, the circuit board 39 has a through hole at a position corresponding to the screw hole of the boss portion 59 of the bottom wall 41, and the lighting circuit 11 is fixed inside the base member 13 by a screw body 61 that passes through this through hole.

[0021] 3. Working Example (1) Item 1 An embodiment of the invention to which the present invention is applied will be described. The invented ultraviolet irradiation device has a diameter of 32.5 mm and a total length of 1,198 mm. It contains 10 LEDs. The current input to the LEDs is 270 mA, and the lamp power is 10 W. The LED pitch is 110 mm. The ultraviolet radiation intensity is 66 μW / cm 2 The lifespan of the UV irradiation device is 20,000 [hours]. (2) Item 2 Another embodiment of the invention to which the present invention is applied will now be described. The invented ultraviolet irradiation device has a diameter of 32.5 mm and a total length of 1,198 mm. It contains 18 LEDs. The current supplied to the LEDs is 300 mA. The LED pitch is 60 mm. The lamp power is 20 W. The ultraviolet radiation intensity is 140 μW / cm 2 The lifespan of the UV irradiation device is 20,000 [hours]. (3) Current black light fluorescent lamps We will explain about the current black light fluorescent lamps that are the same size as Products 1 and 2. The black light fluorescent lamp has a diameter of 32.5 mm and a total length of 1,198 mm. The lamp power is 40 W. The ultraviolet radiation intensity is 66 μW / cm 2 The lifespan of a black light fluorescent lamp is 5,000 [hours].

[0022] <Modification> Although an ultraviolet irradiation device according to one embodiment has been described above, the present invention is not limited to this embodiment, and may have, for example, the following modified examples. Also, the present invention may be a combination of the embodiment and modified examples, or a combination of modified examples. Also, examples not described in the embodiment or modified examples, and design changes within the scope of the gist of the present invention are included in the present invention.

[0023] 1. Black Light The ultraviolet irradiation device 1 according to the embodiment is a replacement for a current black light fluorescent lamp. That is, the ultraviolet irradiation device 1 can be detachably attached to a lighting fixture to which a current black light fluorescent lamp is attached. However, the ultraviolet irradiation device may have a dedicated connection terminal other than the G type, and may be configured to be attached to a dedicated lighting fixture. Also, the ultraviolet irradiation device may be directly connected to a commercial power source, and configured as an ultraviolet irradiation device that does not use a lighting fixture or the like. If the purpose is not to replace black light, the external shape of the housing does not have to be cylindrical, and may be, for example, a shape with a square cross section and a cylindrical overall shape. In this case, for example, the cover member may be shaped like a straight U, and the base member may be shaped like a rectangle. Note that the base member has a heat sink function to release heat when the LED is emitting light, so it is preferable that it is exposed to the outside.

[0024] 2.Cover material The diffusion groove 35 of the cover member 9 extends along the longitudinal direction of the elongated shape, but may extend, for example, in the lateral direction. Also, the connection to the base member may be by a means other than a locking structure. For example, the connection may be by a screw or adhesive. 3. Base material The base member 7 is exposed to the outside except for the portion on which the LED module 5 is mounted. However, if the amount of heat generated when the LED emits light is small (for example, when the input current to the LED is small), it is not necessary for there to be any portion exposed to the outside. 5, there is a lighting device 101 in which a base member 107 is disposed inside a cylindrical cover member 109. The base member 107 is fixed to the base member 13 via a screw member 55 while being locked by ribs 109a and 109b of the cover member 109. The LED module 105 is attached to the base member 107 by locking pieces 107a and 107b of the base member 107. <Other> (1) In the embodiment, an ultraviolet LED is used, but for example, an LED that emits blue light may be mixed in. This can improve the insect catching effect. Furthermore, an LED that emits white light (using phosphor) based on blue light may be mixed in. In this case, in addition to the effect of ultraviolet light and the insect catching effect, the effect of working lighting can also be obtained. In addition to the ultraviolet LED, a white LED may be provided as a working light. (2) In the embodiment, a current lower than the rated current (40(%) to 60(%) of the rated current) is supplied to the high-output type LED to improve the light extraction efficiency (light emission efficiency) with respect to the input current. This can be applied not only to ultraviolet LEDs but also to blue LEDs and white LEDs. In other words, there is another invention in which a high-output type LED is made to emit light at a current value lower than the rated current from the viewpoint of improving the light extraction efficiency, and this other invention can be applied not only to the ultraviolet irradiation device described in the embodiment but also to irradiation devices for general lighting. In this case, the cover member made of a resin material may have diffusion particles (so-called milky white cover). In addition, although it is preferable for the cover member to have a diffusion groove, the diffusion groove may not be necessary depending on the amount of diffusion particles mixed in. When focusing on the current supplied to the LED, the cross section of the cover body is "C" shaped, but this does not need to be limited to this, and for example, it may have a cross section without an opening as described above, or it may have a cross section of a shape other than a circle (for example, a polygonal shape). (3) In the embodiment, the current supplied to the LED is a rated current or a current lower than the rated current, but an even lower current may be supplied. In this case, the base member does not function as a heat sink, but has the function of mounting the LED module. When a low current is supplied to the LED, the amount of heat generated can be suppressed, so the LED module may be directly attached to the cover member. In this case, the cover member may have a cross-sectional shape without an opening. As an example of using a cover member that does not have a base member and has no openings other than at both ends, there is a lighting device 201 in which an LED module 205 is disposed inside a cylindrical cover member 209, as shown in Fig. 6. The LED module 205 is fixed to the base member 13 via an adhesive in a state in which both ends in the short direction of a mounting board 215 are inserted into a pair of mounting grooves 209a, 209b of the cover member 209. [Explanation of symbols]

[0025] 1. UV lighting device 3 LED 5 LED Module 6. Chassis 7 Base material 9 Cover member 11 Lighting circuit 13 Cap member

Claims

[Claim 1] A long mounting board; A plurality of LEDs mounted at intervals along a longitudinal direction of the mounting substrate; a lighting circuit for lighting the plurality of LEDs; having The rated power of the LED is 1 W or more; The lighting circuit supplies a current to the LED that is lower than a rated current of the LED. Irradiation device.

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