JP5082024B1 - Light source for illumination - Google Patents

Abstract

The lamp (illumination light source) 1 includes a power supply unit 80 that outputs DC power, a module substrate 11, and a light emitting unit 13 mounted on the module substrate 11, and the light emitting module 10 that is supplied with power from the power supply unit 80. And a housing 60 that is made of metal, accommodates the power supply unit 80 therein, is adjacent to the light emitting module 10, and is electrically insulated from the light emitting module 10, and is attached to the housing 60. And a base 70 for supplying power from an external power source to the power supply unit 80, one end side is electrically connected to the output terminal TL 1 of the power supply unit 80, and the other end side is electrically connected to the housing 60. A capacitor 80 c that divides the voltage applied between the base 70 and the housing 60 during the test is provided.
[Selection] Figure 1

Description

  The present invention relates to an illumination light source using an LED (light emitting diode) or the like, and more particularly to a technique for improving the performance against a dielectric strength test.

  Conventionally, a light bulb type lamp using an LED or the like has been proposed (see Patent Document 1).

  An example of this type of light bulb shaped lamp is shown in FIG.

  A lamp 100 shown in FIG. 10 includes a power supply unit (not shown) that outputs DC power, a module substrate 111 that is annular in plan view, and a plurality of LEDs (light emitting units) that are disposed along the periphery of the module substrate 111. ) 113, a base 120 formed in substantially the same shape as the light emitting module 110 in a plan view and attached to the upper surface side, and a substantially cylindrical shape made of metal. A power supply unit, and a housing 160 for housing the base 120. The lamp 100 also includes a bottomed cylindrical base 170 disposed on the lower side of the housing 160 and a globe 130 attached to the upper side of the housing 160 so as to cover the light emitting module 110.

  The light emitting module 110 is disposed so as to cover the upper side of the light emitting unit 113, and reflects the light emitted from the light emitting unit 13. And a second reflecting member 150 having a substantially bottomed cylindrical shape attached to the module substrate 111 so as to cover the opening.

  In the lamp 100, the plurality of light emitting portions 113 are arranged along the peripheral portion of the module substrate 111, so that the light distribution characteristics of the lamp 100 can be improved.

JP 2010-86946 A

  By the way, since the lamp is sometimes used at a rated voltage of 220 V to 277 V overseas, an improvement in performance with respect to a dielectric strength test between the base 170 and the casing 160 is required from the viewpoint of ensuring safety during use. . In this withstand voltage test, as shown in FIG. 11, an alternating voltage of 4 kV (for example, a frequency of 60 Hz) is applied between the base 170 and the housing 160 in a state where the shell 171 and the eyelet 172 of the base 170 are short-circuited. To do. The standard of performance required in the dielectric strength test is that neither dielectric breakdown nor flashover occurs according to the industry standard referring to the EN609687 standard.

  However, when the above-mentioned dielectric strength test is performed on the lamp 100, dielectric breakdown may occur between the casing 160 and the light emitting unit 113 disposed in the vicinity of the casing 160. Since the base 170 to the light emitting unit 113 are electrically connected by the power supply unit 80, the voltage applied by the withstand voltage test is concentrated between the light emitting unit 113 and the housing 160 that are electrically opened. When a voltage exceeding the dielectric breakdown distance is applied, dielectric breakdown or flashover occurs.

  In contrast, by improving the withstand voltage between the circuit including the light emitting module 110 and the housing 160 (particularly, the withstand voltage between the light emitting unit 113 and the housing 160), the performance is improved with respect to the withstand voltage test. It is possible to plan. Here, the module substrate 111 is enlarged to increase the distance between the light emitting unit 113 and the housing 160, or the arrangement of the light emitting unit 113 is changed so as to be close to the center of the module substrate 111. It is conceivable to increase the distance between 113 and the housing 160.

  However, when the module substrate 111 is enlarged, the casing 160 for housing the module substrate 111 must be enlarged, and the lamp 100 itself is increased in size. On the other hand, if the arrangement of the light emitting unit 113 is changed so as to be close to the center of the module substrate 111, there is a possibility that desired light distribution characteristics cannot be obtained.

  Further, considering that the module substrate 111 is shared between overseas and domestic, the specifications are shared between the module substrate 111 mounted on the overseas lamp and the module substrate 111 mounted on the domestic lamp. Therefore, it is required to reduce the manufacturing cost of the lamp.

  The present invention has been made in view of the above-described problems, and provides an illumination light source capable of improving performance with respect to a withstand voltage test without changing the positional relationship between a light emitting unit and a housing. is there.

  In order to achieve the above object, an illumination light source according to the present invention includes a power supply unit that outputs electric power, a module board, and a light emitting unit mounted on the module board, and is connected to an output end of the power supply unit. A light emitting module that receives power from the power supply unit, a housing made of a conductive material that houses the power supply unit and is disposed adjacent to the light emitting module, and supplies power from the external power supply to the power supply unit And a voltage applied between the base and the housing during the dielectric strength test, with one end side being electrically connected to the output end of the power supply unit and the other end being electrically connected to the housing. A voltage dividing element for dividing pressure.

  According to this configuration, the light emitting module and the voltage dividing element are commonly connected to the output end of the power supply unit, and further, the voltage dividing element is connected between the output end of the power supply unit and the housing. As a result, during the dielectric strength test, the voltage applied across the both ends of the voltage dividing element, i.e., the dielectric strength test voltage applied between the base and the housing, is approximately between the light emitting module and the housing. The divided voltage is applied, and the voltage applied between the light emitting module and the housing can be reduced. Accordingly, dielectric breakdown occurs between the light emitting unit and the housing without changing the positional relationship between the light emitting unit and the housing so as to increase the distance between the light emitting unit and the housing of the light emitting module. Therefore, it is possible to improve the performance with respect to the withstand voltage test while maintaining the light distribution characteristics.

  Further, according to the present configuration, a device having a base for supplying power from an external power supply to the power supply unit has the same configuration as a domestic lamp having a rated voltage of 100 V to 120 V, but has a rated voltage of 220 V. Since it is possible to satisfy the performance required for the withstand voltage test for an overseas lamp of ˜277V, that is, the current value when an AC voltage of 4 kV is applied between the base and the casing is 100 mA or less, Since parts specifications can be shared between domestic and overseas lamps, manufacturing costs can be reduced.

  Furthermore, the performance with respect to the withstand voltage test can be improved by appropriately selecting a voltage dividing element according to various withstand voltage tests.

  In the illumination light source according to the present invention, the voltage dividing element may be a capacitor, a resistor, or a surge absorber.

  According to this configuration, a relatively inexpensive capacitor or resistor is used as the voltage dividing element, so that the cost of components can be reduced. However, a so-called surge absorber such as a ZNR or a discharge gap can be used instead.

  In addition, the illumination light source according to the present invention may include a connection means for electrically connecting the other end side of the voltage dividing element and the housing.

  Further, in the illumination light source according to the present invention, the connecting means is formed in a plate shape with a conductive material, and is attached in a state in which a part of the opening on one side of the casing is closed and in contact with the casing. A base made of a conductive material and for fixing the light emitting module to the base, one end of which is electrically connected to the other end of the voltage dividing element, and the other end is a screw. It may be composed of a lead wire electrically connected to.

  According to this configuration, the performance for the withstand voltage test can be improved by a simple method of connecting the lead wire to the screw, so that the assembly workability can be improved.

  Further, in the illumination light source according to the present invention, the connection means is disposed on the module substrate and electrically connected to the housing, and one end portion of the voltage dividing element. A lead wire electrically connected to the other end side and having the other end portion connected to a housing connection terminal via a lead wire may be used.

  In the illumination light source according to the present invention, the power supply unit may include a flyback converter in which an input end side and an output end side are electrically insulated by a transformer.

  According to this configuration, since the input end side and the output end side are electrically insulated from each other by the transformer, the voltage can be dropped by the transformer during the withstand voltage test. The voltage applied between the body and the body can be greatly reduced.

  In the illumination light source according to the present invention, the circuit board has a thickness direction between a region where a circuit including the primary coil of the transformer is formed and a region where a circuit including the secondary coil of the transformer is formed. A slit may be formed so as to penetrate through.

  According to this configuration, it is possible to suppress the occurrence of creeping discharge between the circuit including the primary coil and the circuit including the secondary coil during the withstand voltage test, thereby improving performance with respect to the withstand voltage test. be able to.

  The illumination light source according to the present invention may have a rated voltage of 220V to 277V.

The perspective view which fractured | ruptured partially the lamp | ramp which concerns on embodiment. Sectional drawing of the lamp | ramp which concerns on embodiment. Sectional drawing of the principal part of the lamp | ramp which concerns on embodiment. The top view of the lamp | ramp which concerns on embodiment. The perspective view of the power supply unit which concerns on embodiment. The block diagram of the power supply unit which concerns on embodiment. Operation | movement explanatory drawing in the dielectric strength test of the lamp | ramp which concerns on embodiment. The top view of the lamp | ramp which concerns on a modification. The disassembled perspective view of the lamp | ramp which concerns on a modification. The perspective view which fractured | ruptured partially the lamp | ramp which concerns on a prior art example. The figure for demonstrating the method of a withstand voltage test.

<Embodiment>
The lamp 1, which is a lighting light source according to the present embodiment, is used at a rated voltage of 220V to 277V. Based on the industry standard with reference to EN 60968 Article 7, the cap 70 and the housing 60 are connected to each other. Performance against a dielectric strength test (see FIG. 10) in which an AC voltage of 4 kV is applied between them, that is, no dielectric breakdown or flashover occurs during the dielectric strength test.
<1> Structure Hereinafter, the structure of the lamp 1 according to the present embodiment will be described.

  FIG. 1 is a partially broken perspective view of the lamp 1. FIG. 2 is a cross-sectional view taken along line A-A ′ shown in FIG. 1. FIG. 3 is a cross-sectional view of a main part along the line B-B ′ shown in FIG. 1. FIG. 4 is a plan view of the lamp 1 in a state where the globe 30 and the second reflecting member 50 are removed. In FIG. 2, the alternate long and short dash line drawn along the vertical direction of the paper surface indicates the lamp axis J of the lamp 1. .

  As shown in FIGS. 1 and 2, the lamp 1 supplies power to the light emitting module 10, a base 20 to which the light emitting module 10 is attached, a globe 30 covering the light emitting module 10, and the light emitting module 10. Power supply unit 80, circuit holder 62 containing power supply unit 80, casing 60 covering circuit holder 62, base 70 for receiving power supplied from an external commercial power source, light emitting module 10 The first reflecting member 40 for diffusing the emitted light, the second reflecting member 50 for closing the opening inside the first reflecting member 40, the base 70 and the housing 60 during the dielectric strength test. And a capacitor 80c for dividing a voltage applied therebetween.

<1-1> Light Emitting Module The light emitting module 10 includes a module substrate 11 and a plurality of (for example, 16) light emitting units 13 disposed on the module substrate 11. The light emitting unit 13 is formed by sealing a semiconductor light emitting element with a sealing body. Here, the semiconductor light emitting element is an LED that emits blue light, and the sealing body is made of silicone resin mixed with phosphor particles that convert the wavelength of blue light into yellow light. Then, part of the blue light emitted from the semiconductor light emitting element is wavelength-converted into yellow light by the sealing body, and white light generated by the color mixture of the unconverted blue light and the converted yellow light is emitted from the light emitting unit 13. It is emitted from. In addition, the light emission part 13 may use the EL element (electric luminescence element), for example.

  The module substrate 11 is formed in a substantially annular shape in a plan view, and has a tongue piece portion 11a extending inward from one place on the inner peripheral edge. The tongue piece 11 a is provided with a power supply terminal 11 b for supplying power supplied from the power supply unit 80 to the light emitting unit 13.

<1-2> Base The base 20 is formed of a conductive material such as a metal whose main component is Al, and has a substantially cylindrical shape having a through-hole 21 having a circular shape in plan view. The base 20 is arranged in a posture in which the tube axis coincides with the lamp axis J (see FIG. 2). Therefore, the front surface 22 and the rear surface orthogonal to the lamp axis J of the base 20 are both substantially circular in plan view. Here, the power supply unit 80 is arranged in a state in which a part thereof protrudes from the through hole 21 into the globe 30. Further, the semiconductor light emitting module 10 is attached to the front surface 22 side of the base 20. 2 and 3, the base 20 is formed with a screw hole 21 into which the screw 86 is screwed. The light emitting module 10 is fixed to the base 20 together with the first reflecting member 40 by using a screw 86 together. The screw 86 is made of a conductive material.

<1-3> Globe The globe 30 has a shape imitating a bulb of an A-type bulb that is a general bulb shape, and press-fits the opening end 31 of the globe 30 into the front end 60 a of the housing 60. Thus, the light emitting module 10 and the first reflecting member 40 are fixed to the housing 60 in a state of covering the front. In addition, the shape of the globe 30 is not limited to the shape imitating a bulb of an A-type bulb, and may be any shape. Further, the lamp 1 may be configured without a globe. The globe 30 may be fixed to the housing 60 with an adhesive or the like.

  The light incident on the inner surface 32 of the globe 30 is diffused by the peripheral wall of the globe 30, passes through the globe 30, and is taken out of the globe 30.

<1-4> Holder The holder 62 has a substantially cylindrical shape that is open on both sides, and includes a large diameter portion 63 and a small diameter portion 64. Most of the power supply unit 80 is accommodated in the large-diameter portion 63 located on the front side. On the other hand, the rear-side opening 65 of the small-diameter portion 64 located on the rear side is closed by the fitting of the base 70. The holder 62 is made of an insulating material such as resin.

  The large diameter portion 63 of the holder 62 is disposed inside the through hole 21 of the base 20. The holder 62 is provided with a notch 66 at a position corresponding to the tongue piece 11 a of the light emitting module 10. The tip of the tongue piece 11 a is inserted into the holder 62 through the notch 66, and the power supply terminal 11 b disposed at the tip of the tongue piece 11 a is located in the holder 62.

<1-5> Housing The housing 60 is formed of a conductive material such as a metal whose main component is Al, and has a cylindrical shape that is open at both ends and has a diameter reduced from the front to the rear. Further, the base 20 and the opening side end 31 of the globe 30 are accommodated in the front end 60 a of the housing 60, and the base 20 is partly in contact with the housing 60. It is fixed to the housing 60 in a state. Specifically, the outer peripheral edge of the rear side end of the base 20 has a tapered shape in accordance with the shape of the inner peripheral surface 60 b of the housing 60. The tapered surface 25 is in surface contact with the inner peripheral surface 60 b of the housing 60. Thereby, the base 20 and the housing | casing 60 are electrically connected.

  Here, the base 20 and the housing 60 are separate members, but they may be integrally formed by a manufacturing method such as die casting using a mold. Thereby, diffusion of heat generated from the light emitting module can be promoted.

<1-7> Base The base 70 is a member for receiving electric power from the socket of the lighting fixture when the lamp 1 is attached to the lighting fixture and turned on. The type of the base 70 is an E27 base that is an Edison type. The base 70 includes a shell portion 71 having a substantially cylindrical shape and an outer peripheral surface being a male screw, and an eyelet portion 73 attached to the shell portion 71 via an insulating portion 72. An insulating member 74 is interposed between the shell portion 71 and the housing 60.

<1-8> First Reflective Member As shown in FIG. 3, the first reflective member 40 is a cylindrical body having a substantially cylindrical main body 41 that is open on both sides, and a rear side of the main body 41. And a substantially disc-shaped attachment portion 42 that closes the opening. The first reflecting member 40 is made of a resin such as polycarbonate.

  As shown in FIG. 3, the first reflecting member 40 is provided with a hole 43, and the hole is mounted with the outer peripheral edge of the mounting part 42 placed on the inner peripheral edge of the module substrate 11 of the light emitting module 10. The first reflecting member 40 and the module substrate 11 are fastened together with the base 20 by screwing the screw 86 inserted into the portion 43 into the screw hole 26 of the base 20. As shown in FIG. 4, the hole 43 is provided at three locations near the boundary between the main body 41 and the mounting portion 42.

  The main body 41 has a substantially cylindrical shape with a larger outer diameter on the front side than on the rear side, and the cylinder axis thereof coincides with the lamp axis J. The outer peripheral surface of the main body 41 has a substantially annular shape when viewed from the rear side along the lamp axis J and covers a plurality of light emitting units 13 arranged in an annular shape on the module substrate 11. .

  As shown in FIG. 4, the first reflecting member 40 extends along the circumferential direction of the outer peripheral surface 45 of the main body 41 around the cylinder axis of the main body 41 across the main body 41 and the mounting portion 42. A plurality of openings 46 are provided at intervals. Specifically, equidistant intervals are provided along the circumferential direction of the outer peripheral surface 45 so that the 16 openings 46 as many as the number of the light emitting portions 13 of the light emitting module 10 face the light emitting portions 13 in a one-to-one relationship. It is provided in the main body 41 with a space. The opening 46 is substantially square in plan view, and a portion on the cylinder axis side that is about half of the light emitting unit 13 is located in the opening 46 in plan view, and is opposite to the cylinder axis that is the other half. Is covered with the main body 41. That is, about half of the light emitting unit 13 is exposed from the opening 46, and the remaining half is hidden behind the main body 41. As shown in FIG. 3, the upper surface (light emitting surface) of the light emitting unit 13 faces the outer peripheral surface 45 of the main body 41. A part of the light emitted from the light emitting unit 13 is reflected by the outer peripheral surface 45 of the main body 41.

<1-9> Second Reflective Member As shown in FIG. 2, the second reflective member 50 includes a substantially cylindrical main body 50a and a bottomed cylindrical lid that closes the front side opening of the main body 50a. 50b. The main body 50a is formed with a flange 50c having a shape that gradually increases in diameter from the rear toward the front on the front side of the outer peripheral surface over the entire circumference. Thereby, the main body 50a exhibits a function of reflecting the light emitted from the light emitting unit 13 in a direction intersecting the lamp axis J on the outer peripheral surface.

<1-10> Power Supply Unit The power supply unit 80 is for lighting the light emitting unit 13, and, as shown in FIG. 2, a circuit board 80a and various electronic components mounted on the circuit board 80a ( Circuit element) 80b. In the drawings, only some circuit elements are denoted by reference numerals. The power supply unit 80 is accommodated in the holder 62 and is fixed to the holder 62 by screwing, bonding, engagement, or the like.

  The circuit board 80a is formed in a substantially rectangular plate shape, and the main surface thereof is arranged in a posture parallel to the lamp axis J. One end portions of lead wires 88a and 88b are connected to the power supply terminals TP1 and TP2 of the power supply unit 80 provided in the circuit board 80a. The other end portion of the lead wire 88 a is connected to the eyelet portion 73 of the base 70 through the rear side opening 65 of the holder 62. The other end portion of the lead wire 88 b is connected to the shell portion 71 of the base 70 through the through hole 61 provided in the holder 62.

  As shown in FIG. 5A, one end of a twisted pair wiring 82 is connected to the output terminals TL1 and TL2 of the power supply unit 80 provided in the circuit board 80a. A power supply connector 82 a is attached to the other end of the twisted pair wiring 82. The power supply connector 82a is connected to a power supply terminal 11b provided in the light emitting module 10 (see FIG. 4).

  One end of a lead wire 84 is connected to a terminal TE1 provided in the circuit board 80a. A crimp terminal 84a is attached to the other end of the lead wire 84. The crimp terminal 84a is fixed to a screw 86 screwed into the screw hole 26 of the base 20 (see FIG. 4). Thereby, the terminal TE1 is electrically connected to the housing 60 via the lead wire 84, the screw 86, and the base 20. Here, the lead wire 84, the screw 86, and the base 20 constitute connection means for electrically connecting the capacitor 80c and the housing 60.

<1-11> Capacitor (Element for voltage division)
As shown in FIGS. 1 and 2, the capacitor 80 c is attached on a circuit board 80 a constituting a part of the power supply unit 80. In the lamp 1 according to the present embodiment, a capacitor having a capacitance of 3300 pF is used as the capacitor 80a. The capacitor 80a is electrically connected to the terminal TE1 through a wiring pattern formed on the circuit board 80a.
<2> Circuit Configuration Here, the configuration of the circuit including the power supply unit 80 and the capacitor 80c will be described with reference to the circuit diagram of the power supply unit shown in FIG.

As shown in FIG. 6, the power supply unit 80 includes a rectifying / smoothing circuit 81a that rectifies and smoothes AC supplied from an AC power supply (not shown), and a flyback connected to the output terminal of the rectifying and smoothing circuit 81a. And a converter 81b. In addition, power supply terminals TP1 and TP2 for receiving power supply from an AC power supply during normal use and output terminals TL1 and TL2 for supplying power to the light emitting module 10 are provided.
<2-1> Rectifying / Smoothing Circuit The rectifying / smoothing circuit 81a includes a diode bridge DB including four diodes D1, D2, D3, and D4, an electrolytic capacitor C1 connected between output terminals of the diode bridge DB, It is composed of resistors B1, F2, B2 connected between both ends of the capacitor C1, a series circuit composed of a coil NF and a capacitor C2, and outputs a voltage between both ends of the capacitor C2. Here, a zener diode D5 is connected in parallel to the capacitor C2 in order to protect the flyback converter 81b. A surge absorber composed of a resistor F1 and a zinc oxide varistor ZNR is connected between the input terminals of the diode bridge DB in order to prevent a surge voltage from being applied to the rectifying and smoothing circuit 81a.
<2-2> Flyback Converter The flyback converter 81b includes a control circuit IC1, a transformer T1, and a diode D1.

  The control circuit IC1 uses SSL152x series manufactured by NXP Semiconductors. The control circuit IC1 has seven terminals, the first terminal being a power supply terminal, the second terminal being a grounding terminal, and the third terminal being a grounding terminal for an oscillator (not shown) in the control circuit IC1. The voltage supply terminal connected to the reference voltage source (not shown) in the control circuit IC1 is the number terminal, and the current detection terminal is connected to the current detection circuit (not shown) in the control circuit IC1. The sixth terminal is a terminal connected to the source of a switching element (not shown) made of an N-channel MOSFET in the control circuit IC1, and the eighth terminal is a terminal connected to the drain of the switching element. Here, a capacitor C5 for smoothing a voltage applied to the first terminal and a capacitor C5 are connected in parallel between the first terminal and the output terminal on the low potential side of the rectifying and smoothing circuit 81a. A series circuit composed of two resistors R3 and R4 is interposed. The second terminal is connected to the output terminal on the low potential side of the rectifying and smoothing circuit 81a. The third terminal is connected to the output terminal on the low potential side of the rectifying / smoothing circuit 81a via a parallel circuit of a resistor R2 and a capacitor C4. The fourth terminal is connected to a connection point between the resistors R3 and R4, and a voltage generated at the connection point is input. The sixth terminal is connected to the output terminal on the low potential side of the rectifying and smoothing circuit 81a via resistors R6A and R6B connected in parallel to each other.

  The transformer T1 is induced when a current flows through the primary coil T11, a secondary coil T12 that supplies power induced to the light emitting module 10 when a current flows through the primary coil T11, and a primary coil T11. And a tertiary coil T13 for supplying the power to the power supply terminal of the control circuit IC1.

  Here, the primary coil T11 has one end connected to the output terminal on the high potential side of the rectifying and smoothing circuit 12, and the other end connected to the eighth terminal of the control circuit IC1 via the resistor B3. Here, as described above, since the eighth terminal of the control circuit IC1 is connected to the drain of the switching element built in the control circuit IC1, the switching element is turned on and off to cause the primary coil T11 to operate. A pulsating current flows.

  One end of the secondary coil T12 is connected to the output terminal TL1 on the high potential side via the diode D1. The tertiary coil T13 has one end connected to the first terminal of the control circuit IC1 via the diode D4 and the resistor R1, and the other end connected to the output terminal on the low potential side of the rectifying and smoothing circuit 81a.

  The diode D1 has an anode connected to the secondary coil and a cathode connected to the output terminal TL2 on the low potential side. Smoothing capacitors C3 and C7 and resistors R7A and R7B are connected in parallel between the cathode of the diode D1 and the other end of the secondary coil T12. Here, the pulsating voltage generated between the cathode of the diode D1 and the other end of the secondary coil T12 is smoothed by the smoothing capacitors C3 and C7, so that a direct current is generated between the output terminals TL1 and TL2. Voltage is generated.

  A primary coil T11 is included between the other end of the secondary coil T12 opposite to the one connected to the anode of the diode D1 and the output terminal on the low potential side of the rectifying and smoothing circuit 81a. Capacitor for cutting off the circuit (hereinafter referred to as “primary coil side circuit”) 81b1 and the circuit including the secondary coil T12 (hereinafter referred to as “secondary coil side circuit”) 81b2 in a DC manner. C6 is connected.

A capacitor C8 is connected between the output terminal TL1 and the terminal TE1, and the terminal TE1 is electrically connected to the housing 60. The electronic component 80c shown in FIGS. 1 and 2 is the capacitor C8. When the lamp 1 is normally used, the capacitor C8 does not conduct because a DC voltage is output from the output terminals TL1 and TL2 of the power supply unit 80 so that the output terminal TL1 has a higher potential than the output terminal TL2. Therefore, insulation is maintained between the output terminal TL1 and the housing 60. On the other hand, when an AC voltage is applied between the output terminal TL1 and the housing 60 during the dielectric strength test, the capacitor C8 functions as a voltage dividing resistor.
<3> Description of Operation in Dielectric Withstand Voltage Test EN60968 According to the industry standard with reference to Article 7, the dielectric withstand voltage test (with the base 70 and the housing 60 in a state where the shell 71 and the eyelet 72 of the base 70 are short-circuited) In the test to measure the value of the current that flows when an AC voltage of 4 kV (frequency: 60 Hz) is applied during this period (see FIG. 10), if there is dielectric breakdown or flashover, safety as a lamp is ensured. Can be regarded as being.

  FIG. 7A shows an operation in a withstand voltage test of a lamp having the same configuration as the conventional one (hereinafter referred to as a lamp according to a comparative example) in which the output end of the power supply unit 80 and the housing 60 are insulated. It is explanatory drawing.

  In the lamp according to the comparative example, the resistance between the light emitting module 10, in particular, the light emitting unit 13 and the housing 60 is extremely larger than the resistance inside the power supply unit 80 and the light emitting module 10. Therefore, when an AC voltage of 4 kV is applied between the base 70 and the housing 60 in the dielectric strength test, the voltage is concentrated between the light emitting module 10 and the housing 60, and the light emitting unit 13 and the housing 60 are Insulation breakdown occurs.

  FIG. 7B is an operation explanatory diagram in the dielectric strength test of the lamp 1 in which a 3300 pF capacitor C8 is connected between the output end of the power supply unit 80 and the housing 60. FIG.

  In the lamp 1, when a 4 kV AC voltage was applied between the base 70 and the housing 60, a current of 1.5 mA flowed between the light emitting unit 13 and the housing 60. This current value is a current value that can be regarded as neither dielectric breakdown nor flashover, which is a measure for ensuring the safety of the lamp. That is, the lamp 1 according to the present embodiment has greatly improved performance with respect to the withstand voltage test as compared with the lamp according to the comparative example.

  In the lamp 1 according to the present embodiment, the capacitor C8 is interposed between the output terminal TL1 of the power supply unit 80 and the housing 60, so that the light emitting unit 13 and the housing 60 are separated during the withstand voltage test. In the meantime, the voltage applied between the base 70 and the housing 60 is divided by the capacitor C8 so that the voltage is applied between the light emitting unit 13 and the housing 60. The voltage is reduced. Thereby, while preventing the dielectric breakdown which arises between the light emission part 13 and the housing | casing 60, the electric current value which flows into a housing | casing can be suppressed to a very small value. Accordingly, it is possible to reduce the voltage applied between the light emitting unit 13 and the housing 60 during the dielectric strength test without changing the positional relationship between the light emitting unit 13 and the housing 60. While maintaining the characteristics, it is possible to improve the performance against the withstand voltage test.

  Further, according to the lamp 1, the lamp provided with the base 70 for supplying power from the external power supply to the power supply unit 80 has the same configuration as the domestic lamp having the rated voltage of 100V to 120V, but the rated voltage Performance required in the dielectric strength test for overseas lamps of 220V to 277V, that is, neither dielectric breakdown nor flashover occurs when an AC voltage of 4 kV (eg, frequency 60 Hz) is applied between the base 70 and the housing 60 This makes it possible to satisfy the above-mentioned standard, so that component specifications can be shared between domestic lamps and overseas lamps, so that manufacturing costs can be reduced.

  Furthermore, by appropriately selecting the capacitor 80c (C8) according to various dielectric strength tests, it is possible to improve the performance with respect to the dielectric strength test.

  By the way, in the above-mentioned withstand voltage test, when the capacity of the capacitor C8 is 3300 pF, a voltage of about 1.2 kV is applied between both ends thereof. Here, since the internal resistance of the base 70 and the housing 60 can be substantially ignored, a voltage of about 2.8 kV is applied between the input terminals TP1, TP2 and the output terminals TL1, TL2 of the power supply unit 80. It will be. Most of the voltage of 2.8 kV applied between the input terminals TP1 and TP2 and the output terminals TL1 and TL2 of the power supply unit 80 is the primary coils T11 and 2 of the transformer T1 included in the flyback converter 81b. It is considered that it is concentrated between the secondary coil T12 and both ends of the capacitor C6. In other words, since the power supply unit 80 includes the transformer T1, a voltage drop occurs greatly at the transformer T1 during the withstand voltage test, so that the voltage applied between the light emitting unit 13 and the housing 60 is greatly reduced during the withstand voltage test. can do. Here, the capacitance of the capacitor C8 is 3300 pF, but the capacitance can be appropriately set according to the balance with the impedance of the power supply unit during the dielectric strength test and the distance between the light emitting module and the housing. For example, in the case of the power supply unit 80 of the present embodiment, if the capacitance of the capacitor C8 is 1000 pF, it fails the dielectric strength test, but if it is 2200 pF or more, it passes. That is, the withstand voltage improves as the capacitance increases, but since this is the direction in which the size of the capacitor increases, the upper limit of the capacitance is determined by the spatial arrangement, and in the case of the present embodiment, it is up to 4700 pF. became.

Furthermore, since a voltage obtained by dividing the test voltage of 4 kV is applied to the capacitor C8 during the dielectric strength test as described above, it is necessary to use a capacitor with a high withstand voltage. Since the withstand voltage needs to be equal to or higher than the voltage applied to the capacitor, an element having a withstand voltage of 1.2 kV or higher, preferably 4 kV or higher, which is a test voltage, may be selected for 3300 pF of the present embodiment. In the present embodiment, the capacitor C8 is installed on the circuit board 80a. However, it is not always necessary to install the capacitor C8 on the circuit board if possible in terms of the lamp configuration. For example, the capacitor C8 also serves as a wiring connecting the output terminal TL1 and the housing 60. It can also be arranged as follows. In addition to reducing the number of components by installing the capacitor C8 on the circuit board 80a as in the present embodiment, there are advantages in that the arrangement and handling during manufacturing can be simplified.

  As shown in FIG. 5B, in the lamp 1, an elongated slit 80a1 extending in the longitudinal direction of the circuit board 80a is formed inside the circuit board 80a. The slit 80a1 is located on the circuit board 80a between a region where the primary coil side circuit 81b1 is formed and a region where the secondary coil side circuit 81b2 is formed. This prevents the occurrence of creeping discharge between the wiring pattern constituting a part of the primary coil side circuit and the wiring pattern constituting a part of the secondary coil side circuit in the circuit board 80a. . Thereby, the performance with respect to the dielectric strength test of the lamp 1 is further improved.

<Modification>
(1) In the embodiment, the example of the lamp 1 in which the capacitor 80c is electrically connected to the housing 60 via the screw 86 has been described. However, the present invention is not limited to this. For example, as illustrated in FIG. 8, the lamp 2 may be electrically connected to the housing 60 via the power supply connector 82 a.

  FIG. 8A shows a plan view of the lamp 2 according to this modification in a state where the globe 30 and the second reflection member 50 are removed, and FIG.

  As shown in FIG. 8A, in this modification, the lead wire 84 connected to the terminal TE1 is connected to the power feeding connector 82a together with the twisted pair wiring 82.

  Here, the power supply connector 82a includes three slots as shown in FIG. In the power supply terminal 11 b, two sockets corresponding to the twisted pair wiring 82 are connected to the light emitting unit 13 of the light emitting module 10, and a socket corresponding to the lead wire 84 is electrically connected to the housing 60. The socket corresponding to the lead wire 84 of the power supply terminal 11 b is connected to the other end portion of a housing connection lead wire (not shown) whose one end portion is soldered to the housing 60. Here, the connecting means for electrically connecting the capacitor 80c to the housing 60 is constituted by the lead wire 84, the power feeding connector 82a, the power feeding terminal 11b, and the housing connecting lead wire.

  (2) In the embodiment, the example in which the capacitor C8 is connected between the output terminal TL1 of the power supply unit 80 and the terminal TE1 electrically connected to the housing 60 has been described. is not. For example, a resistor may be connected. Alternatively, a surge absorber such as a metal oxide varistor or a discharge gap may be connected.

  (3) In the embodiment, the example of the lamp 1 including the first reflecting member 40 and the second reflecting member 50 has been described. However, the embodiment is not limited thereto, and the first reflecting member 40 and the second reflecting member 40 are not limited thereto. The lamp which is not provided with the reflective member 50 may be used.

  (4) In the embodiment, the example in which the power supply unit 80 includes a flyback converter has been described. However, the present invention is not limited to this. For example, the power supply unit 80 may include a DC-DC converter other than a flyback converter such as a buck-boost converter.

  (5) In the embodiment, the example in which the light emitting unit 13 includes a light emitting diode has been described. However, the present invention is not limited to this, and the light emitting unit 13 may include another light emitting element such as an EL element.

  (6) In the embodiment, the light emitting module and its power supply unit driven by direct current power have been described. However, each of the light emitting modules and the power supply unit that can be driven by alternating current power by having a rectifying action therein. There may be.

  (7) Although the embodiment has been described with reference to a light bulb-shaped lamp, it is possible to improve the withstand voltage by adopting the same configuration even if the lamp has a shape as shown in FIG. 11 as a modification of the shape of the lamp. it can.

  Hereinafter, FIG. 9 will be described. The lamp of FIG. 9 is a lamp used as a thin downlight, and does not have a shell or an eyelet like the bulb-shaped base 70, but instead has power feeding portions 271 and 273 and a fixing portion 270. These power feeding portions 271 and 273 perform a function related to power feeding of the shell and the eyelet, and the function of fixing the lamp to the socket is performed by the fixing portion 270. The power feeding units 271 and 273 are connected to the power supply unit 280 by wiring, and the output from the power supply unit is supplied to the plate-shaped light emitting module 210. The light emitting module 210, the power supply unit 280, and the reflecting member 240 are housed in a casing 260 made of metal.

  Further, a cover 230 made of a light-transmitting resin or the like is attached to the front of the housing 260. And the light radiate | emitted from the light emitting module 210 permeate | transmits the cover 230, and is radiated | emitted outside.

  Similarly, in a lamp having this configuration, it is necessary to ensure a dielectric strength voltage between the power supply unit and the housing in a state where the two power supply units are short-circuited. If the casing 260 is an insulating material, it is possible to easily ensure a dielectric strength voltage. However, when a metal casing is used for heat dissipation of the light emitting module, the output from the power supply unit and the metal casing are the same as in the embodiment. An insulation voltage can be ensured by installing a voltage dividing element between them.

  The lamp according to the present invention can be widely used in general lighting applications.

DESCRIPTION OF SYMBOLS 1, 2 Lamp 10 Light emission module 11 Module board 13 Light emission part 20 Base 26 Screw hole 30 Globe 40 1st reflection member 50 2nd reflection member 60 Case 70 Base 71 Shell 72 Insulation part 73 Eyelet 80 Power supply unit 81a Rectification Smoothing circuit 81b Flyback converter 81b1 Primary coil side circuit 81b2 Secondary coil side circuit 82 Twisted pair wiring 84, 88a, 88b Lead wire 86 Screw

Claims (8)

A power supply unit that outputs power;
A light emitting module having a module substrate and a light emitting unit mounted on the module substrate and connected to an output end of the power supply unit to receive power supply from the power supply unit;
A housing formed of a conductive material, containing the power supply unit therein and disposed adjacent to the light emitting module;
A base for supplying power from an external power source to the power supply unit;
One end side is electrically connected to the output end of the power supply unit and the other end side is electrically connected to the casing, and the voltage applied between the base and the casing is divided in the dielectric strength test. An illumination light source comprising a voltage dividing element. The illumination light source according to claim 1, wherein the voltage dividing element is a capacitor, a resistor, or a surge absorber. The illumination light source according to claim 1, further comprising connection means for electrically connecting the other end side of the voltage dividing element and the housing. The connecting means includes
A base that is formed in a plate shape with a conductive material, covers a part of the opening on one side of the casing, and is attached in contact with the casing;
A screw formed of a conductive material and for fixing the light emitting module to the base;
The one end portion is composed of a lead wire that is electrically connected to the other end side of the voltage dividing element and the other end portion is electrically connected to the screw. Light source for illumination. The connecting means includes
A terminal disposed on the module substrate and electrically connected to the housing;
4. A lead wire having one end portion electrically connected to the other end side of the voltage dividing element and the other end portion connected to the terminal via a lead wire. The light source for illumination as described. The illumination light source according to any one of claims 1 to 4, wherein the power supply unit includes a flyback converter in which an input end side and an output end side are electrically insulated by a transformer. The power supply unit includes a circuit board on which a circuit including the transformer is formed,
The circuit board has a slit penetrating in a thickness direction between a region where a circuit including a primary coil of the transformer is formed and a region where a circuit including a secondary coil of the transformer is formed. The illumination light source according to claim 6 . 7. The illumination light source according to claim 1, wherein the rated voltage is 220 V to 250 V. 8.

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