JP2009194008A - Light-emitting diode module, lighting system, and wiring pattern setting method of light-emitting diode module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting diode module having high reliability, functionality, and visibility without generating weak emission and generating weak lighting by a weak current when a light-emitting diode is turned off, and to provide a lighting system and a wiring pattern setting method of the light-emitting diode module. <P>SOLUTION: The light-emitting diode module 10 comprises: a printed-circuit board 14 having a wiring pattern 13; and a plurality of light-emitting diodes 15 connected in series by the wiring pattern 13. The light-emitting diode module 10 is connected to an AC power supply ACS via a lighting circuit 20. Area S of the wiring pattern 13 is set so that the weak current Is flowing to the light-emitting diode 15 by a parasitic capacity C generated by the wiring pattern 13 becomes smaller than a weak emission limiting current density Iw as a threshold for generating weak emission as weak emission slightly visible from the outside in the light-emitting diode 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light emitting diode module connected to an AC power supply via a lighting circuit, a lighting device including the light emitting diode module, and a wiring pattern setting method for the light emitting diode module.

  Since development of a light emitting diode (LED) has progressed and a technology capable of emitting white light has been developed, it has been proposed to use the light emitting diode as a light source of an illumination lamp.

  However, since one light emitting diode has a small amount of light, it is insufficient as an illumination lamp. In view of this, an illuminating lamp having a light emitting diode module on which a plurality of light emitting diodes are mounted has been proposed (see, for example, Patent Document 1 and Patent Document 2).

  FIG. 5 is a plan view showing a planar state of a light emitting diode module according to a conventional example.

  A light emitting diode module 110 according to a conventional example includes a printed circuit board 114 having a wiring pattern 113 formed on an insulating substrate 112, and a plurality of (for example, five) light emitting diodes 115 connected in series by the wiring pattern 113. And is connected to an AC power supply ACS (see FIG. 6) via a lighting circuit 120 (see FIG. 6). Note that the wiring pattern 113 is formed so as to overlap the insulating base material 112, and the printed circuit board 114 is configured by both of them.

  The lighting device 130 includes a metal lighting fixture body 130b, a light emitting diode module 110 attached to the lighting fixture body 130b, and a lighting circuit 120.

  For example, aluminum is adopted as the lighting fixture main body 130b. The printed circuit board 114 employs an insulating material such as paper phenol, glass epoxy, or composite as the insulating base material 112, and a copper foil is formed as the wiring pattern 113.

  The light emitting diode 115 has a terminal electrode 115t connected to the wiring pattern 113 and a sealing portion 115p for fixing the terminal electrode 115t and sealing the light emitting diode element portion. The terminal electrode 115t is soldered to the wiring pattern 113.

  The light emitting diodes 115 are connected in series with each other by a lighting fixture body 130b having a circular outer periphery and a wiring pattern 113 arranged in an annular shape along the outer periphery of the insulating base 112. The wiring pattern 113p is, for example, the plus side and is connected to the output plus terminal 122p (see FIG. 6) of the lighting circuit 120, and the wiring pattern 113m is, for example, the minus side, the output minus terminal 122m of the lighting circuit 120 (see FIG. 6). And is supplied with power from the lighting circuit 120.

  The wiring pattern 113 is formed with a relatively large area in consideration of reduction of parasitic resistance, ease of connection work, and the like. Accordingly, the wiring pattern 113 generates a parasitic capacitance C (see FIG. 6) due to the insulating base material 112 between the wiring pattern 113 and the luminaire main body 130b.

  FIG. 6 is a block diagram illustrating a schematic configuration of an illumination apparatus including the light emitting diode module according to the conventional example illustrated in FIG.

  The lighting device 130 according to the conventional example is connected to a light emitting diode module 110 having a plurality of light emitting diodes 115 (shown as the light emitting diode LED1 and the light emitting diode LED2 in FIG. 6) connected in series, and an AC power supply ACS. A lighting circuit 120 that converts AC power supplied from the power supply ACS into DC power, supplies the DC power to the LED module 110, and lights the LED module 110 is provided. The light emitting diode module 110 is attached to the lighting fixture body 130b.

  The lighting circuit 120 includes, for example, a rectifier circuit that rectifies alternating current into direct current and a chopper circuit (DC / DC conversion circuit) that steps down direct current obtained by the rectifier circuit.

  The lighting circuit 120 converts AC power into DC power and supplies the DC power to the light emitting diode module 110. That is, the output plus terminal 122p arranged on the output side of the lighting circuit 120 is connected to the plus terminal of the light emitting diode LED1, and the output minus terminal 122m arranged on the output side of the lighting circuit 120 is connected to the minus terminal of the light emitting diode LED2. It is. The light emitting diode LED1 and the light emitting diode LED2 are connected in series.

  The light emitting diode module 110 (the luminaire main body 130b) is the same as the light emitting diode module 110 shown in FIG. In order to facilitate understanding, the light emitting diode 115 constituting the light emitting diode module 110 will be described as two light emitting diodes LED1 and LED2.

  A wiring pattern 113p (see FIG. 5) is formed on the plus terminal of the light emitting diode LED1, and a parasitic capacitance C (parasitic capacitance Ca) exists. Since the light emitting diode LED1 and the light emitting diode LED2 are connected via the wiring pattern 113 (area S), a parasitic capacitance C (parasitic capacitance Cb) exists. Further, a wiring pattern 113m is formed at the minus terminal of the light emitting diode LED2, and a parasitic capacitance C (parasitic capacitance Cc) exists.

  The AC power supply ACS is a commercial AC power supply. One terminal is grounded (neutral point grounding) in consideration of the safety of the consumer to be a ground side terminal tn, and the other terminal is a non-ground side terminal ta. It is as. A non-ground side terminal ta is connected to the power connection terminal 121 on the input side of the lighting circuit 120, and a ground side terminal tn is connected to the power connection terminal 121g via a switch 125. Received power supply.

  The switch 125 is provided in a wiring between the ground side terminal tn of the AC power supply ACS and the power supply connection terminal 121g, and is configured as a so-called one-side switch. In the switch of this form, even when the switch 125 is cut off and turned off, the ground potential GND (corresponding to the lighting fixture body 130b of the light emitting diode module 110) and the wiring connected to the non-ground side terminal ta, the lighting circuit 120 , And the parasitic capacitance C (parasitic capacitance Cb), a weak current Is (weak current Isp, weak current Ism) flows as a parasitic current.

  That is, when the AC power supply ACS has a positive half-wave waveform (positive half-wave voltage), the weak current Isp is the non-ground side terminal ta → the power supply connection terminal 121 → the output plus terminal 122p → the light emitting diode LED1 → It flows through the path of the parasitic capacitance Cb → the ground potential GND → the ground side terminal tn of the AC power supply ACS.

  On the other hand, the weak current Ism is, when the AC power supply ACS has a negative half-wave waveform (negative half-wave voltage), the ground-side terminal tn of the AC power supply ACS → the ground potential GND → the parasitic capacitance Cb → the light emitting diode LED2 → the output minus terminal. It flows in the path | route of 122m-> power supply connection terminal 121-> non-ground side terminal ta of AC power supply ACS.

  In the process of proceeding with the development of the light emitting diode module 110, the inventor of the present application flows the weak current Is due to the parasitic capacitance C to the light emitting diode 115 even when the switch 125 is turned off and turned off, and accordingly, the light emitting diode 115 (light emitting diode LED1). It has been found that the light emitting diode LED2) may emit weak light without being completely extinguished.

  In other words, even when the connection to the ground side (ground side terminal tn) of the AC power supply ACS is cut off by the switch 125 on the ground line side and turned off, the weak current Is flows through the light emitting diode 115 and is visually recognized from the outside. The phenomenon which produces the weak weak light emission was confirmed.

  It is confirmed that the weak lighting with the switch 125 turned off and turned off is likely to occur in the case of the lighting device 130 that performs grounding, and that it is likely to occur when the operator touches it even without grounding. did.

  In addition, it was confirmed that the same problem occurs even when the operation of the lighting circuit 120 is stopped by the remote controller without turning off the switch 125 and turned off.

  Switching on / off is a basic function for an illuminating lamp (illuminating device), and when it is turned off, weak light emission caused by parasitic capacitance causes reliability, functionality, It may become a big problem from a viewpoint of visibility.

In addition, although there exists patent document 3 as what mentions weak light emission, for example, a weak current flows through the impedance element put into the both ends of a switch, and it makes it a subject to prevent that a light emitting diode emits light weakly. This is completely different from the present application.
JP 2006-295085 A JP 2007-295007 A JP 2004-296205 A

  The present invention has been made in view of such a situation, and includes a printed circuit board having a wiring pattern and a plurality of light emitting diodes connected in series by the wiring pattern, and is connected to an AC power supply via a lighting circuit. The wiring pattern is a weak light emission in which a weak current (parasitic current) flowing in the light emitting diode through a parasitic capacitance generated by the wiring pattern when the light emitting diode is turned off is visually recognized from the outside. Is set to an area that is smaller than the weak light emission limit current generated in the light emitting diode, so that when the light emitting diode is turned off, reliability, functionality, and visibility that does not cause weak light emission due to the weak current An object is to provide a high light emitting diode module.

  In addition, the present invention is an illumination device including a light emitting diode module. By using the light emitting diode module according to the present invention as a light emitting diode module, a weak current flowing through the light emitting diode when the light emitting diode is turned off is weak. Another object is to provide a lighting device that is suppressed to be smaller than the light emission limit current and does not generate weak light emission and has high reliability, functionality, and visibility.

  The present invention also relates to a method for setting a wiring pattern of a light emitting diode module according to the present invention, a weak light emission limit current detecting process for detecting a weak light emission limit current that causes weak light emission in the light emitting diode, and the weak current is weak light emission. A pattern area calculation process for calculating the area of the wiring pattern smaller than the limit current and a pattern shape setting process for setting the wiring pattern shape based on the area of the wiring pattern and the distance between the light emitting diodes arranged on the printed circuit board. By providing it, it is possible to easily and accurately set the shape of the wiring pattern of the light-emitting diode module with high reliability, functionality, and high visibility that does not cause weak light emission due to a weak current when the light-emitting diode is turned off. To provide a wiring pattern setting method for a light emitting diode module For the purpose of.

  A light emitting diode module according to the present invention includes a printed circuit board having a wiring pattern formed on an insulating substrate, and a plurality of light emitting diodes connected in series by the wiring pattern, and an AC power supply via a lighting circuit A light-emitting diode module connected to the light-emitting diode, wherein the wiring pattern has a weak current that flows through the light-emitting diode through a parasitic capacitance generated by the wiring pattern when the light-emitting diode is turned off. The area is set to be smaller than a weak light emission limit current that causes light emission in the light emitting diode.

  With this configuration, parasitic capacitance due to wiring patterns can be suppressed and weak current can be reduced. Therefore, reliability, functionality, and visual recognition that do not cause weak light emission due to the weak current flowing in the light emitting diode when the light emitting diode is turned off. It becomes possible to make a highly efficient light emitting diode module.

  In the light emitting diode module according to the present invention, the printed board includes a heat dissipation pattern that is adjacent to the wiring pattern and insulated from the wiring pattern.

  With this configuration, it is possible to obtain a light emitting diode module that can improve the heat dissipation of the printed circuit board and provide a highly reliable lighting device.

  The lighting device according to the present invention includes a metal lighting fixture body, a light emitting diode module having a plurality of light emitting diodes connected in series and attached to the lighting fixture body, and an alternating current supplied from an AC power source. An illumination device including a lighting circuit that turns on the light emitting diode module by converting electric power into direct current power, wherein the light emitting diode module is a light emitting diode module according to the present invention.

  This configuration suppresses the parasitic capacitance that generates a weak current that flows through the light emitting diode when the light emitting diode is turned off, and makes the weak current smaller than the weak light emission limit current so that it does not cause weak lighting. And a lighting device with high visibility.

  Moreover, in the illuminating device which concerns on this invention, the said light emitting diode module is mounted | worn with the said lighting fixture main body through the insulating heat-transfer sheet | seat, It is characterized by the above-mentioned.

  With this configuration, even when the printed circuit board has a back surface pattern on the back surface of the insulating base material (opposite the surface on which the wiring pattern is formed), excellent insulation and heat dissipation are ensured to improve reliability. It can be set as a lighting device.

  The wiring pattern setting method for a light emitting diode module according to the present invention includes a printed circuit board having a wiring pattern and a plurality of light emitting diodes connected in series by the wiring pattern, and is connected to an AC power supply via a lighting circuit. A method of setting a wiring pattern of a light emitting diode module attached to a metal lighting fixture body, wherein a weak light emission limit current detecting process for detecting a weak light emission limit current that causes the light emitting diode to generate weak light emission visually recognized from the outside, and A pattern area calculating process for calculating an area of the wiring pattern in which a weak current flowing through the light emitting diode via a parasitic capacitance generated by the wiring pattern when the light emitting diode is turned off is smaller than the weak light emission limit current; The calculated area of the wiring pattern and the Characterized in that on the basis of the light-emitting diode mutual spacing be placed cement substrate and a pattern shape setting process of setting the shape of the wiring pattern.

  With this configuration, it is possible to form a light emitting diode module that can reduce the weak current by suppressing the parasitic capacitance due to the wiring pattern. Therefore, the reliability and function that does not cause weak light emission due to the weak current when the light emitting diode is turned off. The shape of the wiring pattern of the light emitting diode module having high performance and high visibility can be set easily and with high accuracy.

  The light emitting diode module according to the present invention includes a printed circuit board having a wiring pattern formed on an insulating substrate, and a plurality of light emitting diodes connected in series by the wiring pattern, and is connected via a lighting circuit. A light emitting diode module connected to a power supply, and the wiring pattern is a weak light emission that is visually recognized from the outside by a weak current flowing through the light emitting diode through a parasitic capacitance generated by the wiring pattern when the light emitting diode is turned off. Since the area is set to be smaller than the weak light emission limit current generated in the light emitting diode, it is possible to reduce the weak current by suppressing the parasitic capacitance due to the wiring pattern. Light-emitting diode module with high reliability, functionality, and high visibility that does not produce weak light emission An effect that it becomes possible to Yuru.

  Further, according to the lighting device of the present invention, the metal lighting fixture body, the light emitting diode module having a plurality of light emitting diodes connected in series and attached to the lighting fixture body, and supplied from an AC power source The lighting device includes a lighting circuit that turns on the light emitting diode module by converting alternating current power into direct current power, and the light emitting diode module is a light emitting diode module according to the present invention. It is possible to suppress parasitic capacitance that sometimes generates weak current in the light emitting diode module, and reliability that does not cause weak light emission by making the weak current smaller than the weak light emission limit current when the light emitting diode is turned off. There is an effect that the lighting device can have high functionality and high visibility.

  The light emitting diode module wiring pattern setting method according to the present invention includes a printed circuit board having a wiring pattern and a plurality of light emitting diodes connected in series by the wiring pattern, and is connected to an AC power supply via a lighting circuit. A wiring pattern setting method for a light emitting diode module that is connected and attached to a metal luminaire main body, and is a weak light emission limit current detection process for detecting a weak light emission limit current that causes the light emitting diode to generate weak light emission visually recognized from the outside. And a pattern area calculation process for calculating the area of the wiring pattern in which the weak current flowing through the light emitting diode through the parasitic capacitance caused by the wiring pattern when the light emitting diode is turned off is smaller than the weak emission limit current, Wiring pattern area and placement on printed circuit board Since it includes a pattern shape setting process that sets the shape of the wiring pattern based on the distance between the photodiodes, it is possible to form a light emitting diode module that can reduce the weak current by suppressing the parasitic capacitance due to the wiring pattern. It is possible to easily and accurately set the shape of the wiring pattern of a light-emitting diode module with high reliability, functionality, and high visibility that does not produce weak light emission due to a weak current when the light-emitting diode is turned off. There is an effect.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
Based on FIG. 1, the light emitting diode module and the illuminating device according to the present embodiment will be described.

  FIG. 1 is an explanatory diagram for explaining a schematic structure of a light-emitting diode module and a lighting device according to Embodiment 1 of the present invention, in which (A) is a plan view showing a planar state, and (B) is an arrow of (A). It is an end view in the BB. It should be noted that hatching in the end view is omitted in view of easy view. The same applies to the following drawings.

  The light emitting diode module 10 according to the present embodiment includes a printed circuit board 14 having a wiring pattern 13 formed on an insulating substrate 12 and a plurality of (for example, five) light emitting elements connected in series by the wiring pattern 13. The diode 15 is provided, and is connected to the AC power supply ACS (see FIG. 4) via the lighting circuit 20 (see FIG. 4).

  The lighting device 30 according to the present embodiment includes a metal lighting fixture main body 30b, the light emitting diode module 10 attached to the lighting fixture main body 30b, and a lighting circuit 20 (not shown in the present embodiment).

  The printed circuit board 14 is formed by applying an insulating material such as paper phenol, glass epoxy, or composite as the insulating base material 12 to about 0.5 mm, and applying the copper foil as the wiring pattern 13 to 35 or 70 μm, for example. It is possible. For example, aluminum is adopted as the lighting fixture body 30b.

  The planar size of the luminaire main body 30b is defined by the required light emitting area, and the number of the light emitting diodes 15 is defined by the required light quantity. The light emitting diodes 15 are arranged at equal intervals along the outer periphery of the printed circuit board 14 in consideration of the uniformity of light emission and effective use of the light emitting diodes 15. Therefore, the length of the wiring pattern 13 (interval between adjacent light emitting diodes 15) may be longer than that of the light emitting diode 15 (sealing portion 15p).

  The wiring pattern 13 in the present embodiment is formed as four equal patterns so that five light emitting diodes 15 that are evenly arranged along the outer peripheral portion of the lighting fixture body 30b (printed circuit board 14) are connected in series. It is arranged. Of the five light emitting diodes 15, the light emitting diodes 15 located at both ends are provided with a wiring pattern 13 p on one side and a wiring pattern 13 m on the other side so that they can be connected to the lighting circuit 20. .

  The light emitting diode 15 includes a terminal electrode 15t connected to the wiring pattern 13, and a sealing portion 15p that fixes the terminal electrode 15t and seals a built-in light emitting diode element portion (not shown). The terminal electrode 15t can be easily soldered to the wiring pattern 13, and can be easily replaced. Therefore, the light emitting diode module 10 can have high reliability.

  The light emitting diodes 15 are connected in series with each other by wiring patterns 13 arranged in an annular shape along the outer periphery of the printed circuit board 14 whose outer periphery is formed in a circular shape. The wiring pattern 13p is, for example, the plus side and is connected to the output plus terminal 22p (see FIG. 4) of the lighting circuit 20, and the wiring pattern 13m is, for example, the minus side, the output minus terminal 22m of the lighting circuit 20 (see FIG. 4). And is supplied with electric power from the lighting circuit 20.

  Further, the light emitting diode element part built in the light emitting diode 15 is configured to emit white light by applying, for example, a phosphor. Note that the emission color can be adjusted as appropriate.

  The wiring pattern 13 is in a state in which the connection between the ground side terminal tn (see FIG. 4) of the AC power supply ACS and the lighting circuit 20 is cut off by the switch 25 (see FIG. 4) and the light emitting diode 15 is turned off (off state). The weak current Is (see FIG. 4) that flows through the light emitting diode 15 via the parasitic capacitance C (see FIG. 4) generated by the wiring pattern 13 causes the light emitting diode 15 to emit weak light as weak light that is visible from the outside. Is set to an area S that is smaller than the weak emission limit current Iw (details will be described in the fourth embodiment) as a limit value (details on setting the area S are the second and fifth embodiments). Will explain.)

  That is, in the light emitting diode module 10 according to the present embodiment, the parasitic capacitance C due to the insulating base material 12 between the wiring pattern 13 and the lighting fixture body 30b is suppressed by suppressing the area S of the wiring pattern 13. Since the weak current Is can be reduced, a light emitting diode module with high reliability, functionality, and visibility that does not generate weak light emission due to the weak current Is when the AC power supply ACS is cut off and the light emitting diode 15 is turned off. 10 is possible.

  In addition, the state where the light emitting diode 15 is turned off (off state) is a state where the supply of direct current (DC power) from the lighting circuit 20 to the light emitting diode 15 is stopped, for example, by switching off the AC power supply ACS by the switch 25. (Refer to Embodiment 4).

  In the present embodiment, the parasitic capacitance C is generated by the insulating base material 12 disposed between the wiring pattern 13 and the lighting fixture body 30b. This is not a limitation.

  Note that the relationship between the area S and the parasitic capacitance C will be described in Embodiment 2.

  Further, since the light emitting diode 15 is mounted on the wiring pattern 13 of the printed circuit board 14 formed so as to overlap the lighting fixture main body 30b, the mounting process of the light emitting diode 15 can be simplified, and the light emitting diode has high productivity. The module 10 can be formed.

  The printed circuit board 14 has a wiring pattern 13 formed on an insulating substrate 12. Therefore, since the insulating base material 12 has a considerable thickness, heat dissipation through the lighting fixture body 30b may be a problem. In the present embodiment, the printed circuit board 14 includes a heat radiation pattern 16 that is adjacent to the wiring pattern 13 and insulated from the wiring pattern 13. Therefore, it is possible to radiate heat not only to the lighting fixture main body 30b but also to the space through the heat radiation pattern 16, and to improve the heat dissipation of the printed circuit board 14 and to produce a highly reliable lighting device 30. The diode module 10 can be obtained.

<Embodiment 2>
Based on FIG. 2, the light-emitting diode module and the illumination device according to the present embodiment will be described.

  FIG. 2 is an explanatory diagram for explaining a schematic structure of a light emitting diode module and a lighting device according to Embodiment 2 of the present invention, where (A) is a plan view showing a planar state, and (B) is an arrow of (A). It is an end view which shows the end surface in the code | symbol BB.

  In the first embodiment, the light emitting diodes 15 are arranged in a ring shape, but in the light emitting diode module 10 according to the present embodiment, for example, two light emitting diodes 15 are arranged in a straight line.

  The light emitting diode module 10 includes a printed circuit board 14 having a wiring pattern 13 formed on an insulating base 12 and a plurality of light emitting diodes 15 connected in series by the wiring pattern 13. Further, since the basic configuration of the light emitting diode module 10 is the same as that of the first embodiment, such as the light emitting diode 15 includes a terminal electrode 15t and a sealing portion 15p, detailed description thereof is omitted.

  Further, in the lighting device 30 according to the present embodiment, the light emitting diode module 10 is attached to a metal lighting fixture body 30b that constitutes the housing of the lighting device 30, and the lighting circuit 20 (not shown) is installed in the present embodiment. Connected.

  As described above, the basic configuration of the light emitting diode module 10 according to the present embodiment is the same as that of the first embodiment except that the arrangement in the plan view is different from that of the first embodiment. So, mainly different items will be explained.

  As in the first embodiment, the printed circuit board 14 is applied with an insulating material such as paper phenol, glass epoxy, or composite as the insulating base material 12 with a thickness of, for example, about 0.5 mm, and the wiring pattern 13 with a copper foil of, for example, 35 or It can be formed by being laminated on the insulating substrate 12 to have a thickness of 70 μm.

  The planar size of the luminaire main body 30b is defined by the required light emitting area, and the number of the light emitting diodes 15 is defined by the required light quantity. The light emitting diode 15 is disposed along the outer periphery of the lighting fixture main body 30b in consideration of the uniformity of light emission, the effective use of the light emitting diode 15, and the like. Therefore, the length of the wiring pattern 13 (interval between adjacent light emitting diodes 15) may be longer than that of the light emitting diode 15 (sealing portion 15p).

  The parasitic capacitance C due to the wiring pattern 13 can be calculated as follows.

Parasitic capacitance C = ε (0) where S is the area of the wiring pattern 13, d is the thickness of the insulating substrate 12, ε (0) is the vacuum dielectric constant, and ε (r) is the relative dielectric constant. It can be calculated as ε (r) · S / d. Therefore, the parasitic capacitance C of the wiring pattern 13 can be calculated with high accuracy, and the light emitting diode module 10 that does not cause weak lighting can be easily configured. The unit may be, for example, area S (mm ² ), thickness d (m), and vacuum dielectric constant ε (0) = 8.854 × 101 ⁻¹² (F / m). In the case of an insulator such as paper phenol, glass epoxy, or composite, the relative dielectric constant ε (r) can be set to 5, for example.

Therefore, when the area S = 50 (mm ² ), the thickness d = 0.5 (mm), and the relative dielectric constant ε (r) = 5, the parasitic capacitance C can be calculated as 4.4 (pF). When other conditions are the same and the area S = 30 (mm ² ), it can be calculated as parasitic capacitance C = 2.64 (pF). If the area S is rectangular, it may be simply calculated using the lengths of two adjacent sides. If the area S is configured by a curve as in the first embodiment, an appropriate equation is applied. Just do it.

<Embodiment 3>
Based on FIG. 3, the light-emitting diode module and the lighting device according to the present embodiment will be described. Since the light emitting diode module according to the present embodiment is the same as the light emitting diode module 10 according to the first and second embodiments, different items will be mainly described.

  FIG. 3 is a see-through side view showing an arrangement state of members in the light emitting diode module and the lighting device according to Embodiment 3 of the present invention.

  In the illuminating device 30 according to the present embodiment, the insulating heat transfer sheet 18 is attached to the metal luminaire main body 30b as the housing of the illuminating device 30 using the light emitting diode module 10 according to the first and second embodiments. It is attached via. That is, the light emitting diode module 10 is configured to be attached to the housing (lighting fixture body 30b) of the lighting device 30, and includes the wiring pattern 13, the insulating substrate 12, the back surface pattern 11, the insulating heat transfer sheet 18, and the lighting fixture. The main body 30b is arranged in this order.

  Since the insulating heat transfer sheet 18 is provided between the back surface pattern 11 and the luminaire main body 30b, the reliability of the insulation between the wiring pattern 13 and the luminaire main body 30b is improved, and excellent mountability is achieved. It can be set as the light emitting diode module 10 which can manufacture the illuminating device 30 with insulation and favorable heat dissipation.

  The back surface pattern 11 is a full surface pattern formed in the same manner as the wiring pattern 13 on the entire back surface of the insulating substrate 12 (opposite the surface on which the wiring pattern 13 is formed). The back surface pattern 11 can improve the heat dissipation of the light emitting diode 15.

  The light emitting diode module 10 (printed circuit board 14) is attached to the metal lighting fixture body 30b by, for example, screwing or bonding. Moreover, as the insulating heat transfer sheet 18, a silicone rubber sheet, a silicone gel sheet, or the like can be applied.

  The lighting device 30 according to the present embodiment includes a light emitting diode module 10 having a plurality of light emitting diodes LED connected in series, and converts the alternating current power supplied from the alternating current power supply ACS into direct current power to convert the light emitting diode module 10 into a direct current power. The lighting circuit 20 (refer FIG. 4) to light is provided.

  Moreover, with respect to the parasitic capacitance C due to the insulating base material 12 (thickness d1) in the area S of the wiring pattern 13, the insulating heat transfer sheet 18 (thickness) between the back surface pattern 11 and the lighting fixture body 30b. Since the parasitic capacitance C due to d2) contributes in series, the total parasitic capacitance C can be suppressed.

  The calculation of the parasitic capacitance C when the insulating base 12 (thickness d1) and the insulating heat transfer sheet 18 (thickness d2) are applied may be appropriately calculated according to the electric theory, and the description thereof is omitted. . Which is dominant is determined by the type and thickness of the member actually used. However, in any case, it can be grasped as the parasitic capacitance C caused by the wiring pattern 13.

  Moreover, it is also possible to integrate the back surface pattern 11 and the lighting fixture main body 30b without using the insulating heat transfer sheet 18. In this case, the luminaire main body 30b can be handled as the back surface pattern 11, and the parasitic capacitance C is defined by the thickness d1.

  Moreover, as the lighting fixture main body 30b, for example, by adopting aluminum having a thickness of about 1 to 2 mm, the light emitting diode module 10 can be made highly reliable by reducing the weight and ensuring the heat dissipation.

<Embodiment 4>
Based on FIG. 4, the light-emitting diode module and the lighting device according to the present embodiment will be described. Since the light emitting diode module according to the present embodiment is the same as the light emitting diode module 10 according to the first to third embodiments, different items will be mainly described.

  FIG. 4 is a block diagram showing a schematic configuration of the light emitting diode module and the illumination device according to Embodiment 4 of the present invention.

  The lighting device 30 according to the present embodiment is connected to a light emitting diode module 10 having a plurality of light emitting diodes 15 (shown as light emitting diode LED1 and light emitting diode LED2 in the figure) connected in series, and an AC power supply ACS. The lighting circuit 20 includes a lighting circuit 20 that converts the alternating current power supplied from the alternating current power supply ACS into direct current power, supplies the direct current power to the light emitting diode module 10, and lights the light emitting diode module 10. The light emitting diode module 10 is attached to the lighting fixture body 30b.

  The lighting circuit 20 includes, for example, a rectifier circuit that rectifies alternating current into direct current and a chopper circuit (DC / DC conversion circuit) that steps down direct current obtained by the rectifier circuit. Since an appropriate circuit can be applied, description thereof is omitted.

  As described above, the lighting circuit 20 converts alternating current power into direct current power and supplies the direct current power to the light emitting diode module 10. In other words, the output plus terminal 22p arranged on the output side of the lighting circuit 20 is connected to the plus terminal of the light emitting diode LED1, and the output minus terminal 22m arranged on the output side of the lighting circuit 20 is connected to the minus terminal of the light emitting diode LED2. It is. The light emitting diode LED1 and the light emitting diode LED2 are connected in series.

  As the light emitting diode module 10, the light emitting diode module 10 described in the first to third embodiments is applied as it is. In order to facilitate understanding, the light emitting diode 15 constituting the light emitting diode module 10 will be described as two light emitting diodes LED1 and LED2.

  In addition, the lighting device 30 according to the present embodiment includes a metal lighting fixture body 30b on which the light emitting diode module 10 is mounted, and an insulating heat transfer sheet disposed between the lighting fixture body 30b and the light emitting diode module 10. 18 (see FIG. 3).

  A wiring pattern 13p (see Embodiment 1) is formed at the plus terminal of the light emitting diode LED1, and a parasitic capacitance C (parasitic capacitance Ca) exists. Since the light emitting diode LED1 and the light emitting diode LED2 are connected via the wiring pattern 13 (area S), a parasitic capacitance C (parasitic capacitance Cb) exists. Further, a wiring pattern 13m is formed at the minus terminal of the light emitting diode LED2, and a parasitic capacitance C (parasitic capacitance Cc) exists.

  The AC power supply ACS is, for example, a commercial AC power supply. One terminal is grounded (neutral point grounding) in consideration of the safety of consumers to be a ground side terminal tn, and the other terminal is a non-ground side terminal. It is as ta. The non-ground side terminal ta is connected to the power supply connection terminal 21 on the input side of the lighting circuit 20, and the ground side terminal tn is connected to the power supply connection terminal 21g via the switch 25. It is possible to receive power supply.

  The switch 25 is provided in a wiring between the ground side terminal tn of the AC power supply ACS and the power supply connection terminal 21g, and is configured as a so-called one-side switch. As described in the conventional example, in the switch of this embodiment, even when the switch 25 is disconnected and the light emitting diode 15 is turned off, the ground potential GND (the lighting fixture body 30b in the first to third embodiments) A current path is generated through the wiring connected to the non-ground side terminal ta, the lighting circuit 20, and the parasitic capacitance C (parasitic capacitance Cb), and a weak current Is (weak current Isp, weak current Ism) flows.

  The present invention can be similarly applied to the case where the switch 25 is not cut off and the light is turned off by stopping the operation of the lighting circuit 20 with a remote controller.

  Next, the weak current Is caused by the parasitic capacitance C (parasitic capacitance Cb, for example, corresponding to the wiring pattern 13 shown in FIGS. 1 and 2) in the present embodiment will be described.

  As described in the conventional example, when the AC power supply ACS has a positive half-wave waveform (positive half-wave voltage), the non-ground side terminal ta of the AC power supply ACS → the power supply connection terminal 21 → the output plus terminal 22p → the light emitting diode LED1 → A weak current Isp flows through the path of the parasitic capacitance Cb → the ground potential GND → the ground side terminal tn of the AC power supply ACS.

  Further, when the AC power supply ACS has a negative half-wave waveform (negative half-wave voltage), the ground-side terminal tn of the AC power supply ACS → the ground potential GND → the parasitic capacitance Cb → the light emitting diode LED2 → the output minus terminal 22m → the power supply connection terminal 21 → Weak current Ism flows through the path of the non-ground terminal ta of the AC power supply ACS.

  In addition, when it is not necessary to distinguish the weak current Isp and the weak current Ism, the weak current Is may be simply used.

  The parasitic capacitance C (here, the parasitic capacitance Cb) is C (F), the effective value of the voltage of the AC power supply ACS is E (V), and the frequency of the AC power supply ACS is f (Hz). The impedance Zc is expressed as Zc = 1 / (ωC) = 1 / (2πfC), and if a voltage drop due to the impedance in the path through which the weak current Is (A) flows is ignored, an alternating current is generated across the parasitic capacitance C (impedance Zc). The effective value E (V) of the voltage of the power supply ACS is applied.

  Therefore, it can be calculated as the weak current Is = E / Zc = 2πfCE (A). In other words, since it is possible to apply a simple formula, it is possible to calculate the weak current Is with high accuracy. Therefore, it is possible to emit weak light by suppressing the parasitic current C and suppressing the weak current Is. It can be avoided reliably.

  Further, the weak emission limit current Iw as a limit value for causing the light emitting diode 15 to generate weak emission as weak emission slightly visible from the outside of the light emitting diode module 10 was detected as follows (weak emission limit). Current detection process).

  Five test subjects were prepared. In a completely dark room, a current was passed through the light emitting diode 15 to emit light, the current was gradually reduced from 1 μA and observed, and the current value when it was recognized that the light was completely extinguished was examined. As a result, at 0.2 μA, everyone recognizes weak lighting, at 0.17 μA, two persons recognize that they are completely turned off, and at 0.15 μA, two more persons recognize that they are completely turned off, and at 0.1 μA, the last one person Recognized that it was completely extinguished.

  Therefore, in the present embodiment, the weak light emission limit current Iw as a limit value for causing the light emitting diode 15 to generate weak light emission is set to 0.1 (μA). That is, by specifying the weak light emission limit current Iw that generates weak light emission, the allowable value of the weak current Is (a value smaller than the weak light emission limit current Iw) can be grasped, and the allowable area S of the wiring pattern 13 can be obtained. Therefore, the area S of the wiring pattern 13 can be suppressed and the weak lighting can be surely avoided.

  Note that the weak light emission limit current Iw is determined by the characteristics of the semiconductor element portion (light emitting diode LED1 and light emitting diode LED2) built in the light emitting diode 15. For example, the compound semiconductor material constituting the pn junction, the pn junction It is determined by the element shape (element characteristics) such as the shape. Therefore, the weak light emission limit current needs to be obtained experimentally as appropriate in accordance with the characteristics of the semiconductor element part to be employed.

<Embodiment 5>
In the present embodiment, the wiring pattern setting method for the light emitting diode module described in the first to fourth embodiments will be described. That is, the wiring pattern setting method according to the present embodiment includes the above-described weak light emission limit current detection process, a pattern area calculation process and a pattern shape setting process which are executed based on the detection result in the weak light emission limit current detection process. Is provided.

  First, a calculation method (pattern area calculation process) of the area S of the wiring pattern 13 that can make the weak current Is smaller than the weak emission limit current Iw will be described. For simplicity, the calculation formula of the parasitic capacitance C described in the second embodiment and the calculation formula of the weak current Is described in the fourth embodiment will be used as appropriate. The basic configurations of the light-emitting diode module 10, the lighting device 30, and the lighting fixture body 30b are the same as those in the first to fourth embodiments, and will be described with appropriate assistance.

  Formula for calculating parasitic capacitance C explained in the first embodiment, that is, parasitic capacitance C = ε (0) · ε (r) · S / d, formula for calculating weak current Is explained in the fourth embodiment, that is, weak current The weak current Is = 2πf · ε (0) · ε (r) · S · E / d is obtained from two calculation formulas of Is = 2πfCE. When the formula of the weak current Is is rewritten into the formula for calculating the area S, the area S = d · Is / (2πf · ε (0) · ε (r) · E).

For example, a weak current Is corresponding to the weak emission limit current Iw = 0.1 (μA), a frequency f = 50 Hz, a vacuum dielectric constant ε (0) = 8.854 × 10 ⁻¹² F / m, an area S = Substituting for d · Is / (2πf · ε (0) · ε (r) · E) results in an area S = 36 × d / (ε (r) × E) (mm ² ). That is, the area S of the wiring pattern 13 needs to be smaller than 36 × d / (ε (r) × E) (mm ² ).

Furthermore, for area S = 36 × d / (ε (r) × E) (mm ² ), for example, thickness d = 0.5 (mm), relative permittivity ε (r) = 5, effective value Substituting E = 100V results in an area S = 36 (mm ² ).

That is, when the frequency f of the AC power supply ACS is 50 Hz and the effective value E is 100 V, the wiring using the insulating base material 12 having a thickness d = 0.5 (mm) and a relative dielectric constant ε (r) = 5 When the member 14 is applied, the area S of the wiring pattern 13 for making the weak current Is smaller than the weak light emission limit current Iw needs to be smaller than 36 (mm ² ).

  Therefore, it is possible to set the shape of the wiring pattern 13 based on the calculated area S of the wiring pattern 13 and the interval (length) between the light emitting diodes 15 arranged on the wiring member 14 (pattern shape setting process). .

For example, if the length L of the wiring pattern 13 is 20 mm with respect to the area S = 36 (mm ² ) of the wiring pattern 13, the width W of the wiring pattern 13 needs to be smaller than 1.8 mm.

  Note that when the width W of the wiring pattern 13 is reduced, an increase in conductor resistance may be a problem. In that case, the problem can be solved by increasing the film thickness of the wiring pattern 13.

  As described above, in the lighting device 30 (light emitting diode module 10), since the area S of the wiring pattern 13 is set smaller than a predetermined calculated value, the lighting circuit is operated by the switch 25 connected to the ground side terminal tn of the AC power supply ACS. The parasitic capacitance C (parasitic capacitance Cb) that generates the weak current Is in the light emitting diode module 10 (light emitting diode LED1, light emitting diode LED2) can be suppressed in a state where the light emitting diode 15 is turned off by disconnecting 20 from the AC power supply ACS. When the AC power supply ACS is cut off and turned off, the weak current Is is suppressed to be smaller than the weak light emission limit current Iw, and the reliability, functionality, and visibility that do not cause weak lighting are high. The lighting device 30 can be used.

  As described above, the wiring pattern setting method according to the present embodiment includes the printed circuit board 14 having the wiring pattern 13 and the plurality of light emitting diodes 15 connected in series by the wiring pattern 13, via the lighting circuit 20. A wiring pattern setting method for a light emitting diode module 10 connected to an AC power supply ACS and attached to a metal lighting fixture body 30b, and detects a weak light emission limit current Iw that causes the light emitting diode 15 to generate weak light emission visually recognized from the outside. The weak light emission limit current detection process, and the wiring pattern 13 in which the weak current Is flowing in the light emitting diode 15 through the parasitic capacitance C generated by the wiring pattern 13 when the light emitting diode 15 is turned off becomes smaller than the weak light emission limit current Iw. Pattern area calculation process for calculating the area S of And a pattern shape setting process of setting the shape of the wiring pattern 13 on the basis of the light emitting diode 15 mutual spacing be placed on the area S and the printed circuit board 14 of the line pattern 13.

  Therefore, when the light-emitting diode 15 is turned off, the shape of the wiring pattern 13 of the light-emitting diode module 10 with high reliability, functionality, and visibility that does not generate weak light emission due to the weak current Is is set easily and with high accuracy. It becomes possible to do.

It is explanatory drawing explaining the schematic structure of the light emitting diode module which concerns on Embodiment 1 of this invention, and an illuminating device, (A) is a top view which shows a planar state, (B) is the arrow BB of (A). FIG. It is explanatory drawing explaining schematic structure of the light emitting diode module which concerns on Embodiment 2 of this invention, and an illuminating device, (A) is a top view which shows a planar state, (B) is the arrow BB of (A). It is an end elevation which shows the end surface in. It is a see-through | perspective side view which shows the arrangement | positioning state of the member in the light emitting diode module which concerns on Embodiment 3 of this invention, and an illuminating device. It is a block diagram which shows schematic structure of the light emitting diode module which concerns on Embodiment 4 of this invention, and an illuminating device. It is a top view which shows the planar state of the light emitting diode module which concerns on a prior art example. It is a block diagram explaining schematic structure of the illuminating device provided with the light emitting diode module which concerns on the prior art example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light emitting diode module 10b Lighting fixture main body 11 Back surface pattern 12 Insulating base material 13, 13p, 13m Wiring pattern 14 Printed circuit board 15 Light emitting diode 15p Sealing part 15t Terminal electrode 16 Heat radiation pattern 18 Insulating heat transfer sheet 20 Lighting circuit 21 Power supply Connection terminal 21g Power supply connection terminal 22m Output minus terminal 22p Output plus terminal 25 Switch 30 Lighting device 30b Lighting fixture body ACS AC power source C, Ca, Cb, Cc Parasitic capacitance d, d1, d2 Thickness GND Ground potential Is, Ism, Isp Weak current LED1, LED2 Light emitting diode S Area ta Non-ground side terminal tn Ground side terminal

Claims (5)

A light emitting diode module comprising a printed circuit board having a wiring pattern formed on an insulating substrate and a plurality of light emitting diodes connected in series by the wiring pattern, and connected to an AC power supply via a lighting circuit. And
The wiring pattern is a weak light emission in which a weak current flowing in the light emitting diode through a parasitic capacitance generated by the wiring pattern when the light emitting diode is turned off causes the light emitting diode to generate a weak light emission visually recognized from the outside. A light emitting diode module characterized in that the area is set to be smaller than the limit current. The light emitting diode module according to claim 1,
The printed circuit board includes a heat dissipation pattern that is adjacent to the wiring pattern and insulated from the wiring pattern. A light fixture body made of metal, a light emitting diode module having a plurality of light emitting diodes connected in series and attached to the light fixture body, and converting the AC power supplied from an AC power source into DC power to emit the light A lighting device comprising a lighting circuit for lighting a diode module,
The lighting device according to claim 1, wherein the light emitting diode module is the light emitting diode module according to claim 1. The lighting device according to claim 3,
The lighting device is characterized in that the light emitting diode module is mounted on the lighting fixture body via an insulating heat transfer sheet. A wiring pattern of a light emitting diode module, comprising a printed circuit board having a wiring pattern and a plurality of light emitting diodes connected in series by the wiring pattern, connected to an AC power source via a lighting circuit and attached to a metal lighting fixture body A setting method,
A weak light emission limit current detection process for detecting a weak light emission limit current causing the light emitting diode to generate weak light emission visually recognized from the outside;
A pattern area calculating process for calculating an area of the wiring pattern in which a weak current flowing through the light emitting diode via a parasitic capacitance generated by the wiring pattern when the light emitting diode is turned off is smaller than the weak emission limit current;
A wiring pattern setting for a light emitting diode module, comprising: a pattern shape setting process for setting a shape of the wiring pattern based on the calculated area of the wiring pattern and a distance between the light emitting diodes arranged on the printed circuit board Method.

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