JP2014216289A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device having a simple structure and making light distribution easily variable.SOLUTION: An LED lighting device 1 includes: an LED module 19 which has a substrate 23, a first LED group 28 where a plurality of LEDs 24 are provided on the side of one surface 23a of the substrate 23 in serial connection and second LED groups 29, 29 where the plurality of LED 24 are provided to be serially connected and connected to the first LED group 28 in an inverse-parallel state, and in which the first and second LED groups 28, 29, are located on the substrate 23 at non-rotationally symmetric positions; a device body 2 where the LED module 19 is disposed; and a lighting-up device 4 outputting alternating-current voltage to the first and second LED groups 28, 29, 29, and lighting up the first and second LED groups 28, 29, 29 alternately and also in different output ratio.

Description

  Embodiments described herein relate generally to an LED lighting device having an LED module capable of controlling light distribution.

  In general, white light is used as illumination light in LED lighting fixtures, and the color rendering property of white light is improved and the color temperature is adjusted. For example, Patent Document 1 discloses a light emitting device that adjusts the color temperature of light emitted from an LED. In this light emitting device, an annular and truncated cone-shaped reflector is divided into two divided regions, and a plurality of LED chips (near ultraviolet semiconductor light emitting elements) are connected in parallel to each divided region. The polarity of the LED chip in the region is reversed and connected to the wiring. When an AC rectangular wave voltage is applied to the wiring, the LED chips in the divided regions are alternately lit. In the light emitting device, the ratio of the emission intensity of the output light of each divided region is determined according to the duty of the rectangular wave voltage, and the ratio of the color temperature is determined. The light emitting device emits white light having a color temperature determined according to the ratio. That is, the color temperature of the output light from the light emitting device can be freely adjusted by applying an AC rectangular wave voltage to the wiring and controlling the duty.

  And what was shown, for example in patent document 2 is proposed as LED lighting fixture which can change light distribution. In this luminaire, the light source part of the LED is attached to the light source part support shaft, and the light axis is installed in a direction substantially orthogonal to the rotation axis. The light source unit support shaft is disposed on the rotation axis of the reflecting mirror, is rotated about the rotation axis by the drive unit, and is moved up and down along the rotation axis. Thereby, the light distribution direction of the light beam of a light source part can be changed easily.

JP 2009-238729 A (Pages 40-41, FIGS. 19-21) JP 2012-28257 A (page 4-5, FIG. 1)

The illumination device having a configuration in which the light source unit is rotated about the rotation axis and moved up and down along the rotation axis includes a horizontal rotation motor and a vertical movement motor as a drive unit. And has the disadvantages of being expensive and limited in use.
An object of the present embodiment is to provide an illuminating device that has a simple configuration and whose light distribution can be easily changed.

  The LED lighting device according to the present embodiment includes an LED module, a device main body, and a lighting device.

  The LED module includes a substrate, a first LED group, and a second LED group. In the first LED group, a plurality of LEDs are provided in series connection on one side of the substrate. In the second LED group, a plurality of LEDs are connected in series and provided in reverse parallel connection to the first LED group. And the 1st LED group and the 2nd LED group are arrange | positioned so that it may become a non-rotation symmetrical position on a board | substrate.

  The apparatus main body is provided with at least an LED module. The lighting device is configured to output an alternating voltage to the first and second LED groups of the LED module so that the first and second LED groups can be turned on alternately and at different output ratios.

  According to the embodiment of the present invention, the light output of the first and second LED groups is controlled by controlling the application time ratio per cycle of the AC voltage applied to the first and second LED groups. Therefore, it can be expected that the light distribution from the LED module can be varied as desired.

It is a schematic perspective view of the LED lighting apparatus which shows embodiment of this invention. The LED illuminating device is shown, wherein (a) is a schematic top view and (b) is a schematic front view. It is a partially cutaway schematic side view of the LED lighting device. It is a schematic front view of a straight tube | pipe type LED lamp same as the above. It is a schematic sectional side view of a straight tube | pipe type LED lamp same as the above. It is a schematic top view of an LED module same as the above. It is a schematic circuit diagram of a lighting device same as the above. It is a wave form diagram of an alternating current rectangular wave voltage same as the above. It is a schematic light distribution diagram of LED lighting apparatus same as the above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The LED lighting device 1 of the present embodiment is a lighting fixture (base light) that is directly attached to the ceiling surface. As shown in FIG. 2, the fixture main body 2, the straight tube LED lamp 3, and the lighting device as the main body of the device. 4. The instrument main body 2 is made of, for example, a cold-rolled steel plate, and is formed in a long box having end plates 5 and 5 and a reflecting plate 6 as shown in FIG. And the instrument main body 2 has attached a pair of sockets 7 and 8 to / from which the straight tube LED lamp 3 is attached / detached to both ends 2a and 2b in the longitudinal direction.

  Further, as shown in FIG. 3, the instrument body 2 includes a long base plate 9 that is attached to the ceiling surface with screws or the like. The base plate 9 is formed in a drooping portion 10 which is bent at right angles on both sides in the short direction and has a folded portion 10a. And the support plate 11 is attached to the longitudinal direction both ends 2a and 2b of the instrument main body 2, respectively, and the reflecting plate 6 is attached to this support plate 11 with the knurled screw 12. FIG. The reflector 6 is formed in a box shape that is long and has a substantially pentagonal cross section orthogonal to the longitudinal direction.

  Further, the base plate 9 is provided with fixing plates 13 and 13 on the end plates 5 and 5 side of the longitudinal ends 2a and 2b of the instrument body 2, respectively. Sockets 7 and 8 are attached to the fixed plates 13 and 13, respectively. An insertion hole (not shown) through which the sockets 7 and 8 are inserted is provided at the bottom 6 a of the reflection plate 6.

  Further, as shown in FIG. 2A, the lighting device 4 and the terminal blocks 14 and 15 are attached to the base plate 9 between the support plates 11 and 11 by screws (not shown). The base plate 9 is provided with a wire hole 16 for drawing in a power supply line from an external power source, a signal hole 17 for drawing in a dimming light beam for transmitting a dimming signal. Bolt holes 18, 18 and the like for mounting with bolts are provided. As shown in FIG. 2 (b), the instrument body 2 has a longitudinal dimension (size) so that the straight tube LED lamp 3 is attached to the pair of sockets 7 and 8.

  As shown in FIG. 4, the straight tube type LED lamp 3 includes an LED module 19, a tube body 20, and caps 21 and 22. One or more LED modules 19 are provided according to the total length of the straight tube LED lamp 3.

  As shown in FIG. 6, the LED module 3 includes a substrate 23, a plurality of LEDs (light emitting diodes) 24, and connectors 25 and 26. The board | substrate 23 is an electrically insulating rigid board | substrate, consists of synthetic resin boards, such as a glass epoxy material, and is formed in the elongate rectangle. For example, it is formed in a rectangular shape with a dimension in the short (width) direction of 20 mm and a dimension in the longitudinal direction of 250 mm. Further, the thickness of the substrate 23 is, for example, 1.6 mm.

  The plurality of LEDs 24 are made of, for example, a surface-mounting type LED package that emits white light, and are mounted on the one surface 23 a side of the substrate 23. The plurality of LEDs 24 include a first LED group 28 mounted on a straight line as a predetermined pattern at a regular interval, for example, 7 mm along the longitudinal direction in the central portion of the substrate 23 in the short direction, They are grouped into second LED groups 29 and 29 mounted at equal intervals along the longitudinal direction at both ends in the short direction. The plurality of LEDs 24 of each of the second LED groups 29 and 29 are provided along the first LED group 28 at a predetermined interval, for example, 5 mm, and the LEDs 24 of the first LED group 28 are arranged. It is mounted so as to be opposite to the polarity. That is, the first LED group 28 and the second LED groups 29 and 29 are provided on the substrate 2 in a non-rotationally symmetric position. Here, the non-rotationally symmetric position means that the first LED group 28 and the second LED groups 29 and 29 are not arranged at each other position regardless of the position of the substrate 2 that is rotated.

  The first LED group 28 and the second LED group 29, 29 are connected in series by a wiring pattern (not shown) made of, for example, copper foil, in which the plurality of LEDs 24 are formed on one surface 23 a of the substrate 23. ing. Further, in the first LED group 28 and the second LED group 29, 29, the endmost LEDs 24, 24 on both ends 23c, 23d in the longitudinal direction of the substrate 23 are connected to one terminal (not shown) of the connectors 25, 26, respectively. They are connected by a wiring pattern (not shown). Further, another wiring pattern (not shown) for electrically connecting the other terminals (not shown) of the connectors 25 and 26 is formed on the one surface 23a of the substrate 23 along the longitudinal direction. The connector 25 is connected to the lighting device 4. The connector 26 is a connection terminal (relay terminal) when a plurality of LED modules 19 are used.

  Thus, the plurality of LEDs 24 of each of the first LED group 28 and the second LED groups 29 and 29 are connected in series, and the first LED group 28 and the second LED groups 29 and 29 Are connected in reverse parallel. The first LED group 28 and the second LED groups 29 and 29 are provided so that the total forward voltages of the plurality of LEDs 24 connected in series are equal. That is, when the same voltage is applied between both ends of the first LED group 28 and the second LED group 29, 29, an equivalent current is supplied to the first LED group 28 and the second LED group 29, 29. Is flowing. Here, “equivalent” is not limited to mathematical or strict equivalent, but means substantially equivalent, and allows a relative difference within 5%.

  Further, the substrate 23 is provided with a plurality of mounting holes 30 in the longitudinal direction. And the white reflective layer 31 is apply | coated to the one surface 23a except the LED24 and the connectors 25 and 26. The substrate 23 may be formed of a metal having thermal conductivity, such as aluminum (Al). In this case, an insulating film or the like is formed on at least one surface 23a. Further, the substrate 23 may be formed of a ceramic plate or the like having an insulating property.

  And the LED module 19 is attached to the attachment body 32, as shown in FIG. The attachment body 32 is made of a metal having a light weight and high thermal conductivity, for example, aluminum (Al), and has a substantially bowl shape. That is, the attachment body 32 is formed in an arc-shaped column having an arc-shaped surface 32b along the flat portion 32a and an inner surface 20b of the tube body 20 to be described later, and the longitudinal dimension thereof is substantially the same as that of the substrate 23 or is somewhat larger than the substrate 23. It is formed so as to be larger. And the attachment body 32 is provided so that the circular arc-shaped surface 32b may be mounted in the inner surface 20b of the tubular body 20, and the LED module 19 is attached to the plane part 32a. That is, a screw (not shown) through the mounting hole 30 of the substrate 23 is completely screwed into a screw hole (not shown) formed in the flat portion 32a. The other surface 23 b of the substrate 23 is in surface contact with the flat portion 32 a of the attachment body 32.

  The tubular body 20 is made of a light-transmitting synthetic resin such as polycarbonate (PC) resin, and is formed in a cylindrical shape having an outer diameter of 25 mm, for example, and accommodates the attachment body 32 along the longitudinal direction thereof. The tube body 20 is accommodated so that the one surface 23a of the substrate 23 of the LED module 19 is located slightly away from the center axis 20c of the tube body 20 or the inner surface 20b facing the center axis 20c. That is, the size of the attachment body 32 is formed so as to be so.

  The tubular body 20 has a portion 20d on which the arcuate surface 32b of the mounting body 32 is placed having a constant thickness, for example, 1.0 mm, and a portion 20e that faces the first LED group 28 of the LED module 19. To the portion 20f where the flat surface portion 32a of the mounting body 32 is located so as to gradually and smoothly increase from the certain thickness (for example, 1.0 mm). The thickness of the portion 20f is, for example, 2.0 to 2.5 mm.

  In FIG. 4, the caps 21 and 22 are made of an electrically insulating synthetic resin such as polybutylene terephthalate (PBT) resin, and are molded into a bottomed cylindrical shape having substantially the same outer diameter as the tubular body 20. Are provided at both ends 20g and 20h. The base 21 is provided with a pair of power supply contacts 33, 33, and the base 22 is provided with a single ground contact 34. The pair of power feeding contacts 33, 33 are connected to the connector 25 of the LED module 19 by lead wires (not shown) in the base 21. The ground contact 34 is connected to the attachment body 32 by a lead wire (not shown) in the base 22.

  Thus, the straight tube type LED lamp 3 is formed by assembling the mounting body 32 to which the LED module 19 is mounted, the tube body 20 that houses the mounting body 32, and the caps 21 and 22. In FIG. 1 or FIG. 2B, the socket 7 is formed in a structure in which a pair of power feeding contacts 33, 33 of the base 21 is inserted and connected, and the socket 8 is formed by one piece of the base 22. A ground contact 34 is inserted and connected. The appliance body 2 is provided with an LED module 19 by attaching straight tube LED lamps to the sockets 7 and 8.

  The lighting device 4 is connected to a power line (not shown) introduced from the power supply hole 16 and is connected to an external commercial AC power source. Further, a signal line (not shown) introduced from the signal hole 17 is connected and connected to an external dimmer. A pair of output lines (not shown) are connected to the socket 7, and a ground line (not shown) is connected to the socket 8. The lighting device 4 outputs an AC rectangular wave voltage to the first LED group 28 and the second LED groups 29 and 29 of the LED module 19, and alternately switches the first LED group 28 and the second LED groups 29 and 29. And a known configuration capable of lighting the first LED group 28 and the second LED groups 29 and 29 at different output ratios or dimming ratios according to a dimming signal from an external dimmer. It is formed by. FIG. 7 shows an example of the lighting circuit 35.

  The lighting circuit 35 includes a rectifier 36, a full bridge inverter circuit 37, and a control circuit 38. The rectifier 36 is composed of, for example, a rectifier, and its input side is connected to the input terminals 40a and 40b via a noise filter circuit 39 including a current fuse F1, a capacitor C1, and a transformer T1. A commercial AC power supply Vs (AC100V) is connected to the input terminals 40a and 40b. A smoothing capacitor C2 is connected to the output side of the rectifier 36. The rectifier 36 and the smoothing capacitor C2 form a DC power source between both ends of the smoothing capacitor C2.

  The full bridge inverter circuit 37 has four switching elements Q1 to Q4 connected in series and parallel. Here, for example, field effect transistors are used for the switching elements Q1 to Q4. That is, a series circuit of switching elements Q1 and Q2 and a series circuit of switching elements Q3 and Q4 are respectively connected between both ends of the smoothing capacitor C2. A midpoint A1 of the switching Q1 and the switching Q2 is connected to the output terminal 41a, and a midpoint A2 of the switching Q3 and the switching Q4 is connected to the output terminal 41b. The gates of the switching elements Q1 to Q4 are connected to the control circuit 38.

  The output terminals 41a and 41b are a first LED group 28 and a second LED group which are connected in reverse parallel to the LED module 19 via the socket 7 of the appliance body 2, the base 21 of the straight tube LED lamp 3, and the resistor R1. 29, 29. Here, the resistor R1 suppresses an overcurrent from flowing to the LED module 19 due to an accident such as a short circuit of the switching elements Q1 to Q4, and is provided in either the LED module 19 or the lighting device 4. Also good.

  The control circuit 38 performs on / off control of the switching elements Q1 to Q4 of the full bridge inverter circuit 37 according to the dimming signal from the external dimmer 42, and outputs an AC rectangular wave voltage from the output terminals 41a and 41b. Is formed. That is, the control circuit 38 is configured to simultaneously turn on / off the switching elements Q1, Q4, simultaneously turn on / off the switching elements Q2, Q3, and to alternately turn them on / off at a predetermined duty (time). . When the switching elements Q1 and Q4 are simultaneously turned on, the current from the smoothing capacitor C2 flows to the first LED group 28 of the LED module 19. Further, when the switching elements Q2 and Q3 are simultaneously turned on, the current from the smoothing capacitor C2 flows to the second LED groups 29 and 29. As a result, as shown in FIG. 8A, for example, rectangular wave voltages with equal positive and negative duties D1 and D2 are output to the output terminals 41a and 41b.

  When a current flows through the first LED group 28, the plurality of LEDs 24 are turned on to emit white light. Further, when a current flows through the second LED groups 29, 29, the plurality of LEDs 24 are turned on to emit white light. That is, white light is alternately emitted from the first LED group 28 and the second LED groups 29 and 29 in accordance with the AC rectangular wave voltage. Here, the control circuit 38 is formed to turn on and off the switching elements Q1 to Q4 so that the frequency of the AC rectangular wave voltage is 500 Hz or more, for example, 1 KHz. Even if the first LED group 28 and the second LED groups 29 and 29 are alternately lit, flickering due to the lighting is prevented.

  Then, according to the dimming signal from the external dimmer 42, the light output (output ratio) from the LED module 19 is constant, and the first LED group 28 and the second LED groups 29, 29 Each output ratio is controllable. For example, as shown in FIG. 8B, the positive duty D1 is controlled to be smaller than the negative duty D2 in a state where the duty of one cycle is constant according to the dimming signal. Thereby, the light output from the 1st LED group 28 reduces, and the light output from the 2nd LED groups 29 and 29 increases.

  The control circuit 38 is formed so that the first LED group 28 and the second LED groups 29 and 29 are individually dimmed and turned on in response to a dimming signal from the external dimmer 42. Yes. That is, when the second LED groups 29 and 29 are dimmed, the ON period of the switching elements Q2 and Q3 is controlled to a duty corresponding to the dimming signal. As shown in FIG. 8C, the negative duty of the AC rectangular wave voltage is reduced by the rest period S2.

  Further, the control circuit 38 is formed so that the first LED group 28 and the second LED groups 29 and 29 can be individually dimmed and lighted from the state where the positive and negative duties are equal. That is, when the first LED group 28 is dimmed, the ON period of the switching elements Q1 and Q4 is controlled to a duty corresponding to the dimming signal. As shown in FIG. 8D, the positive duty of the AC rectangular wave voltage is obtained by subtracting the suspension period S1 from the end point of the constant duty D1. When the second LED groups 29 and 29 are dimmed, the ON periods of the switching elements Q2 and Q3 are controlled to a duty corresponding to the dimming signal. As shown in FIG. 8E, the negative duty of the AC rectangular wave voltage is obtained by subtracting the suspension period S2 from the end point of the constant duty D2.

  Thus, the control circuit 38 is configured to output an AC rectangular wave voltage having the pause periods S1 and S2 at the positive and negative duties D1 and D2 in accordance with the dimming signal from the external dimmer 41. The first LED group 28 is dimmed when the current flow period is shortened for the pause period S1, and the second LED groups 29 and 29 are dimmed while the current flow period is shortened for the pause period S2. Lights on. That is, the first LED group 28 and the second LED groups 29 and 29 are lit at different output ratios depending on the rest periods S1 and S2. The suspension periods S1 and S2 may be provided at any point in time with a constant duty D1 and D2.

  Next, the operation of this embodiment will be described. When the commercial AC power supply Vs is supplied to the lighting device 4 of the LED lighting device 1, the lighting device 4 operates, and an AC rectangular wave voltage having a positive and negative peak value and an equivalent duty between the output terminals 41a and 41b is 500 Hz or more. For example, it outputs at a frequency of 1 KHz. The AC rectangular wave voltage is applied between both ends of the first LED group 28 and the second LED groups 29 and 29 provided in the LED module 19 of the straight tube LED lamp 3.

  Since the first LED group 28 is in the forward direction when the AC rectangular wave voltage has a positive duty, the first LED group 28 is lit with current flowing. In addition, the second LED groups 29 and 29 are in the forward direction when the negative duty of the AC rectangular wave voltage is present, so that the current flows and lights up. That is, the first LED group 28 and the second LED groups 29 and 29 are alternately lit to emit white light. White light emitted from the first LED group 28 and the second LED groups 29 and 29 is transmitted through the tube body 20 and emitted to the external space of the instrument body 2. Here, since the white light is alternately emitted from the first LED group 28 and the second LED groups 29 and 29 at a frequency of 1 KHz, flickering of the radiated light in the straight tube LED lamp 3 is prevented.

  And since the LED module 19 is provided so that the total forward voltage (Vf) of several LED24 by which the 1st LED group 28 and the 2nd LED groups 29 and 29 were connected in series becomes equal, By applying positive and negative same wave height values (same voltage) between both ends of the first LED group 28 and the second LED group 29, 29, the first LED group 28 and the second LED group 29, 29 are applied. Almost the same current flows. Almost the same white light is emitted from each of the first LED group 28 and the second LED groups 29 and 29. Thereby, the brightness nonuniformity of the straight tube | pipe type LED lamp 3 is suppressed.

  Then, the lighting device 4 responds to the dimming signal from the external dimmer 42, and the total light output of the first LED group 28 and the second LED group 29, 29 (the total duty of the positive and negative duties S1, S2). ) Is constant, the light outputs of the first LED group 28 and the second LED groups 29 and 29 are varied. That is, the first LED group 28 and the second LED groups 29 and 29 are lit at different output ratios while the emitted light from the straight tube LED lamp 3 is constant.

  Further, the lighting device 4 outputs an AC rectangular wave voltage having pause periods S1, S2 with positive and negative duties D1, D2 in accordance with a dimming signal from the external dimmer 42. The first LED group 28 is dimmed when a current flows over a period obtained by subtracting the pause period S1 from the positive duty D1. The second LED groups 29 and 29 are dimmed when a current flows over a period obtained by subtracting the pause period S2 from the negative duty D2. The first LED group 28 and the second LED group 29, 29 are lit at different dimming ratios due to the suspension periods S1, S2 being different according to the dimming signal. Thus, the first LED group 28 and the second LED groups 29 and 29 emit white light according to the output ratio or the dimming ratio, respectively.

  The first LED group 28 is provided at the center in the width direction of the substrate 23 so as to face the portion 20e where the thickness of the tube 20 rises. As shown in FIG. 9 (b), the light distribution to be performed is condensing. That is, if the dimming signal is to turn on only the first LED group 28, condensing illumination light can be obtained from the LED lighting device 1.

  In addition, the second LED groups 29 and 29 are provided at both end portions in the width direction of the substrate 23 so as to face the portions where the thickness of the tube body 20 gradually and smoothly increases. The light distribution emitted through the body 20 is broad as shown in FIG. That is, if the dimming signal is to turn on only the second LED group 29, 29, illumination light with a wide light distribution can be obtained from the LED lighting fixture 1.

  When both the first LED group 28 and the second LED group 29, 29 are turned on at the same output ratio or dimming ratio, for example, as shown in FIG. The light distribution and the light distribution by the second LED groups 29, 29 are combined, and a substantially egg-shaped light distribution of the condensed light and the broad light is obtained. Then, by varying the output ratios or dimming ratios of the first LED group 28 and the second LED groups 29, 29, the light distribution from the light concentration in FIG. 9B is changed to that in FIG. 9C. Any light distribution up to a wide light distribution can be obtained. Thus, the light distribution of the LED lighting device 1 can be easily varied by setting the output ratio or dimming ratio of each of the first LED group 28 and the second LED groups 29 and 29 as desired.

  According to the LED lighting device 1 of the present embodiment, the positive and negative duties of the AC rectangular wave voltage applied to the first LED group 28 and the second LED group 29, 29 are controlled as desired, so that the first Since the light outputs of the LED group 28 and the second LED groups 29 and 29 change, the light distribution of the radiated light of the LED lighting device 1 can be easily and desirably varied with a simple configuration.

  The first LED group 28 and the second LED groups 29 and 29 of the LED module 19 are provided so that the total forward voltage (Vf) of the plurality of LEDs 24 connected in series is equal. Therefore, substantially the same current flows through the first LED group 28 and the second LED group 29, 29, and substantially the same white light is emitted from the first LED group 28 and the second LED group 29, 29. Be able to. Thereby, it has the effect that the brightness nonuniformity of the straight tube | pipe type LED lamp 3 can be suppressed.

  Further, since the lighting device 4 outputs an AC rectangular wave voltage having pause periods S1, S2 with positive and negative duties D1, D2 according to a dimming signal from the external dimmer 42, the first LED group 28 The second LED groups 29 and 29 can be lit at different dimming ratios, and the light distribution of the LED illumination device 1 can be easily and desirably varied with a simple configuration. Further, since the AC rectangular wave voltage is output, the ratio of the positive and negative duties D1 and D2 can be easily set according to the dimming signal.

  In the present embodiment, the first LED group 28 and the second LED groups 29 and 29 emit the same white light. However, the present invention is not limited to this and emits different emission colors. May be. In this case, different color lights from the first LED group 28 and the second LED groups 29 and 29 can be mixed as desired, and illumination light having a desired chromaticity can be obtained.

  In addition, the first LED group 28 and the second LED groups 29 and 29 use surface-mounted LEDs (package products) as the LEDs 24, but the present invention is not limited thereto, and LED chips may be used. Good. Further, the lighting device 4 may be formed to output, for example, a sinusoidal AC voltage, and outputs an AC voltage having pause periods S1, S2 in one of positive and negative duties D1, D2. It may be. Moreover, although the LED lighting fixture 1 was comprised in the direct attachment type, a hanging type and an embedded type may be sufficient. The LED module 19 may be formed in a ring shape and used for a ring-shaped lighting fixture, a GX53-type lamp, or the like.

  Further, the above-described embodiment of the present invention is presented as an example, and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... LED illuminating device, 2 ... Appliance main body as an apparatus main body, 4 ... Lighting device, 19 ... LED module, 23 ... Board | substrate, 24 ... LED, 28 ... 1st LED group, 29 ... 2nd LED group

Claims (4)

A first LED group in which a plurality of LEDs are provided in series connection on one side of the substrate, and a second LED in which a plurality of LEDs are connected in series and provided in reverse parallel connection with the first LED group An LED module, wherein the first and second LED groups are arranged in a non-rotationally symmetric position on the substrate;
An apparatus main body in which the LED module is disposed;
A lighting device that outputs an alternating voltage to the first and second LED groups, and can alternately light the first and second LED groups at different output ratios;
LED lighting device characterized by comprising.   The LED lighting device according to claim 1, wherein the first and second LED groups are provided so that a total forward voltage of the plurality of LEDs connected in series is equal.   The LED lighting device according to claim 1, wherein the lighting device outputs an AC rectangular wave voltage.   The LED lighting device according to any one of claims 1 to 3, wherein the lighting device outputs an AC voltage having a pause period at least one of a positive duty and a negative duty.

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