JP2008257994A - Low-temperature environment corresponding lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of being used by installing in a conventional socket for an electric bulb as an alternative of a halogen lamp and lessening changing frequencies at longer life and low power consumption under a low-temperature environment such as a refrigeration warehouse and reducing electric power cost. <P>SOLUTION: The lighting device 100 is provided with a plurality of light-emitting devices 110, a circuit 130 for driving the plurality of the light-emitting devices 110, cases 140 and 150 for storing the plurality of the light-emitting devices 110 and circuit 130 in the inside, a projection section 146 formed on a part of the cases 140 and 150 and having cylindrical male screw 146A, and a base 160 having a female screw 162B which thread-engages with the male screw 146A of the projection section 146. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illumination device used for illumination in a low temperature environment.

  Conventionally, incandescent bulbs using tungsten filaments have been filled with an inert gas in the bulb to prevent filament wear and extend the life. Among them, a halogen lamp achieves a particularly long life by enclosing a halogen in a light bulb to generate a halogen cycle. In other words, in halogen lamps, tungsten atoms evaporated from the filament combine with halogen atoms in the vicinity of the tube wall of the glass tube to form tungsten halide. When this tungsten halide floats in the glass tube and approaches the filament, it is halogenated. A series of halogen cycles in which tungsten is separated into halogen atoms and tungsten atoms and the tungsten atoms return to the filament prevents the filament from being worn and extends its life.

In recent years, lighting devices (LED lamps) that use LEDs with low power consumption and long life have been proposed (see, for example, Patent Document 1) that can be used as they are attached to a socket for a light bulb.
JP2000-200512

  However, in the halogen lamp, in order for the halogen cycle to occur smoothly, the tube wall temperature of the glass tube needs to be kept at 250 ° C. or higher. Accordingly, there is a problem that the life of the halogen lamp is shortened in a low temperature environment where the tube wall temperature of the glass tube cannot be maintained at 250 ° C. or higher. For this reason, for example, when a halogen lamp is used for lighting in a freezer warehouse kept at a low temperature of −20 ° C. to −40 ° C., the halogen lamp becomes unusable in a short period of time, and the halogen lamp is frequently used in a warehouse in a low temperature environment. Had to be replaced.

  On the other hand, there is a case where a halogen cycle is smoothly generated by providing a heater near the halogen lamp and heating it. However, when such a heater is provided, there is a problem that the power cost is greatly increased by a heater with high power consumption, and the cooling efficiency inside the freezer warehouse is deteriorated by heating with the heater.

  Further, the LED lamp as disclosed in Patent Document 1 is not designed on the assumption that it will be used for a long period of time in a low temperature environment, and since the luminance is insufficient as compared with the halogen lamp, the halogen lamp As an alternative, it could not be used for lighting inside the refrigerated warehouse.

  For example, in a conventional LED lamp or the like having a base for a light bulb, in order to fix the base to the main body, a method of caulking the base to engage with the main body and bonding with an adhesive has been adopted. For this reason, according to an undisclosed study by the present inventor, when using a conventional LED lamp or the like in a low temperature environment such as a freezer warehouse maintained at a low temperature of -20 ° C to -40 ° C, There was a possibility that the main body dropped out of the base. That is, the adhesive deteriorates due to the low temperature and the adhesive strength decreases, and the caulked portion is loosened due to the difference in shrinkage between the base and the main body in a low temperature state, so that the main body is dropped from the base.

  In addition, in conventional LED lamps using a large number of LEDs to improve the brightness, a large number of LEDs are arranged evenly on the substrate, so the periphery is in the vicinity of the center surrounded by other LEDs. There is a problem that the heat generated by the LED tends to be trapped, and the temperature of the LED near the center and the substrate is higher than that of other portions. When such a conventional LED lamp is used in a low-temperature environment such as the inside of a refrigerated warehouse, the temperature difference between the LED near the outer periphery which is easily cooled by the outside air and the LED near the center where heat tends to be trapped becomes larger. It has become difficult to control the current and voltage of the LED, causing the problem that the light emission and life of the LED become unstable.

  In view of such circumstances, the present invention can be used as a substitute for a halogen lamp by being attached to a conventional socket for a light bulb, and has a long life and low power consumption even in a low temperature environment such as in a refrigerated warehouse. It is an object of the present invention to provide an illumination device that can reduce the power cost while reducing the amount of power.

  (1) The present invention is formed in a plurality of LEDs, a circuit for driving the plurality of LEDs, a casing that houses the plurality of LEDs and the circuit, and a part of the casing, An illumination device comprising: a protrusion having a cylindrical male screw; and a base having a female screw screwed with the male screw of the protrusion.

  (2) In the present invention, the base has a bottomed cylindrical shape in which spiral-shaped unevenness is formed on a peripheral wall, and the spiral-shaped unevenness is formed on the outer side of the peripheral wall with a female screw and a screw of a bulb socket. The illuminating device according to (1), wherein a male screw is formed, and a female screw that is screwed with the male screw of the protruding portion is formed inside the peripheral wall.

  (3) The present invention is also the lighting device according to (1) or (2), wherein the casing is made of polycarbonate resin.

  (4) The present invention is also the illumination device according to any one of (1) to (3), wherein the plurality of LEDs are arranged in an annular region.

  (5) The present invention may further include a lead wire that is connected to the base and supplies power to the circuit, and the protrusion has a groove formed in an axial direction on at least a circumferential surface of the male screw. The lead wire is connected to the outer peripheral surface of the base through the groove from the inner periphery of the projecting portion to the outer periphery of the base, according to any one of the above (1) to (4) It is an illuminating device of description.

  (6) The present invention may further include a lead wire that is connected to the base and supplies power to the circuit, and the protrusion includes a groove formed in an axial direction on at least a peripheral surface of the male screw. The lead wire passes through the groove from the inner periphery of the protrusion, and has one end sandwiched between the male screw of the protrusion and the female screw of the base. ) To (4).

  (7) The present invention is also the lighting device according to any one of (1) to (6) above, which can be lit in a temperature environment of at least 0 ° C. to −20 ° C.

  (8) The lighting device according to any one of (1) to (6) above, wherein the lighting device can be lit at a temperature environment of at least 0 ° C. to −40 ° C.

  (9) The present invention is also the lighting device according to any one of the above (1) to (6), characterized in that it can be lit in a temperature environment of at least 0 ° C. to −60 ° C.

  The lighting device according to the present invention can be used as an alternative to a halogen lamp by being attached to a conventional socket for a light bulb, has a long life and low power consumption even in a low temperature environment such as in a refrigerated warehouse, and the replacement frequency is low. It is possible to achieve an excellent effect that the power cost can be reduced while reducing the power cost.

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

  FIG. 1 is a partial cross-sectional view showing the structure of a lighting device 100 according to an embodiment of the present invention. As shown in the figure, the illumination device 100 includes an LED 110, an LED substrate 120, a drive circuit 130, a main body case 140, a transparent cover 150, and a base 160.

  The LED 110 is a light emitting diode, and in the present embodiment, 180 white LEDs are used. Thus, by providing a large number of LEDs 110, the illumination device 100 achieves the same brightness as that of a conventional halogen lamp. As a result, the lighting device 100 can obtain sufficient brightness even when used as a substitute for a halogen lamp.

  The LED board 120 is a disk-like board on which a circuit for connecting the 180 LEDs 110 is configured, and the LEDs 110 are arranged on the surface in a predetermined arrangement. The LED substrate 120 is fixed to the main body case 140 with a plurality of screws (not shown).

  The drive circuit 130 has a rectifier circuit that converts an AC voltage (for example, AC 100V) fed to the base 160 into a DC voltage, a step-down circuit that adjusts the converted DC voltage to a predetermined voltage, and a constant current supplied to each LED 110. It is a circuit composed of a constant current circuit or the like to be controlled. The drive circuit 130 is fixed to the main body case 140 by a plurality of screws (not shown), and is electrically connected (not shown) to the base 160 and the LED substrate 120.

  The main body case 140 is a substantially funnel-shaped casing, in which the LED substrate 120 is disposed in the vicinity of the enlarged end 142 shown on the lower side in FIG. 1, and the drive circuit 130 is fixed and accommodated therein. In addition, a cylindrical protrusion 146 is formed on the reduction end 144 shown on the upper side in FIG. 1, and a male screw 146 </ b> A is formed on the outer peripheral surface of the protrusion 146. In this embodiment, a polycarbonate resin that can withstand use in a low temperature environment of −20 ° C. or lower is adopted as the material of the main body case 140.

  The transparent cover 150 is a substantially cylindrical cover for covering and protecting the LED 110 and the LED substrate 120, and is fixed to the enlarged end 142 of the main body case by a plurality of screws (not shown). In the present embodiment, transparent polycarbonate is adopted as the material of the transparent cover 150.

  The base 160 has a substantially cylindrical shape with a bottom for receiving an AC voltage by being connected to a socket for a light bulb. In the present embodiment, a general E26 standard is adopted. Thereby, the illuminating device 100 can be used as it is only by attaching to the general socket for light bulbs, without requiring an exclusive socket or other components.

  FIG. 2 is an enlarged cross-sectional view showing the periphery of the protrusion 146 and the base 160. As shown in the figure, the base 160 is disposed at a substantially cylindrical shell 162, an insulating portion 164 formed so as to close an opening at one end of the shell 162, and a substantially center of the insulating portion 164. The eyelet 166 has a substantially disk shape. On the outer peripheral surface of the shell 162, a male screw 162A that is screwed with the female screw of the bulb socket is formed. The male screw 162A is formed by pressing spiral irregularities on the peripheral wall of the cylindrical shell. That is, at the same time that the screw 162A is formed on the outer peripheral surface of the shell 162, the female screw 162B is formed on the inner peripheral surface of the shell 162. In this embodiment, the female screw 162B is screwed into the male screw 146A of the protrusion 146, so that the base 160 is reliably engaged with the main body case 140 and fixed.

  The female screw 162B of the base 160 is screwed into the male thread 146A of the protrusion 146, and a part of the base 160 is crimped to engage with the recess of the main body case 140, so that the base 160 is more securely attached. You may make it fix to.

  Next, the arrangement of the two lead wires 170A and 170B that electrically connect the drive circuit 130 and the base 160 will be described.

  In this embodiment, the base 160 receives a two-phase AC voltage, and includes two lead wires 170A that connect the drive circuit 130 and the shell 162, and two lead wires 170B that connect the drive circuit 130 and the eyelet 166. It is connected.

  First, as shown in FIG. 2, the protrusion 146 includes a protrusion groove 146B formed so as to cut out a part of the protrusion end surface, and an axial direction from the protrusion groove 146B to the vicinity of the base end of the protrusion 146 on the outer peripheral surface. The lead wire 170A is connected to the shell 162 through the protruding groove 146B and the outer groove 146C. Specifically, the lead wire 170A extends from the drive circuit 130 toward the inside of the protrusion 146, and is inserted into the protrusion end groove 146B and the outer peripheral groove 146C from the protrusion end of the protrusion 146. The leading end of the lead wire 170A is folded back from the vicinity of the base end of the protrusion 146 to the outside of the shell 162 in a state where the coating is removed, and is connected to the outer peripheral surface of the shell 162 by soldering or the like. On the other hand, the lead wire 170 </ b> B extends from the drive circuit 130 toward the inside of the protrusion 146, and is soldered to the eyelet 166 from the inside of the base 160. As described above, in this embodiment, the lead wire 170B can be easily soldered to the outer peripheral surface of the shell 162 from the outside after the base 160 is screwed to the protruding portion 146. It can be simplified.

  FIG. 3 is a cross-sectional view showing another form of arrangement of the lead wire 170A. In the form shown in the figure, the protruding portion 146 has only a protruding end groove 146B formed so as to cut out a part of the protruding end surface, and the lead wire 170A extends from the inside of the protruding portion 146 to the protruding end groove 146B. The distal end inserted into the cover and stripped of the coating is folded outward toward the proximal end of the protrusion 146. That is, the leading end of the lead wire 170 </ b> A is sandwiched between the shell 162 and the protruding portion 146 that are screwed together, and is crimped and connected to the inner peripheral surface of the shell 162. As described above, according to the embodiment shown in FIG. 3, since the tip of the lead wire 170 </ b> A can be crimped to the inner peripheral surface of the die 160 at the same time when the die 160 is screwed to the protrusion 146, the lead wire 170 </ b> A is attached. The step of soldering the shell 162 can be omitted.

  Next, the arrangement of the LEDs 110 will be described.

  FIG. 4 is a front view of the LED substrate 120. As shown in the figure, the LEDs 110 are arranged in an annular LED array region 120A on the surface of the LED substrate 120. In other words, the LED 110 is not disposed in the central region 120 </ b> B near the center of the LED substrate 120 where heat is likely to be trapped. Thus, in this embodiment, by disposing the LEDs 110 only in the annular LED array region 120A, the heat generated by each LED 110 is efficiently radiated, and the temperature of each LED 110 does not become extremely uneven. I am doing so. As a result, even when used in a refrigerated warehouse maintained at, for example, −20 ° C. to −40 ° C., 180 LEDs 110 can stably emit light with substantially uniform brightness and color tone, and can replace halogen lamps. It is possible to obtain a usable luminance. In addition, it is possible to prevent only some of the LEDs 110 from having a short life or damage to the LED substrate 120 due to a temperature difference.

  The lighting device 100 of the present embodiment is used for a long period of time in a freezing warehouse maintained at, for example, -20 ° C to -40 ° C by securely engaging and fixing the base 160 to the main body case 140 in this way. Even in this case, the base 160 does not come off or loosen from the main body case 140.

  Further, the lead wire 170A connected to the shell 162 of the base 160 is soldered to the outer peripheral surface of the shell 162 through the projecting end groove 146B and the outer peripheral groove 146C of the protrusion 146, and so on. It is possible to solder the lead wire 170A to the shell 162 from the outside of the base 160, instead of soldering the lead wire 170A to the shell 162 from the narrow inside. Thereby, the manufacturing process is simplified, and stabilization of quality, improvement of productivity, and reduction of manufacturing cost can be achieved.

  Further, the protruding portion 146 has a protruding end groove 146 </ b> B, and the lead wire 170 </ b> A connected to the shell 162 of the base 160 is inserted into the protruding end groove 146 </ b> B of the protruding portion 146 and sandwiched between the protruding portion 146 and the shell 162. As a result, the step of soldering the lead wire 170A to the shell 162 can be omitted, the productivity can be improved, and the manufacturing cost can be reduced.

  Further, by adopting polycarbonate resin as a material of the main body case 140 and the transparent cover 150, it is possible to reduce deterioration due to a low temperature environment. Furthermore, since the lighting device 100 can be reduced in weight, the load applied to the base 160 can be reduced, and the durability of the base 160 can be improved.

  In addition, by arranging the plurality of LEDs 110 in the annular LED array region 120A, the plurality of LEDs 110 can be uniformly warmed using the low temperature environment, and the plurality of LEDs 110 can stably emit light for a long period of time. It has become.

  In addition, the illuminating device 100 which concerns on this invention is not limited to above-described embodiment, Of course, in the range which does not deviate from the summary of this invention, a various change can be added.

  For example, the LED 110 is not limited to a white LED, and may be an LED that emits light of other colors.

  Further, the number of LEDs 110 is not limited to 180, and more or less LEDs 110 that match the required luminance may be used.

  The base 160 is not limited to the E26 standard, and may be another screw-in standard such as E39 or EX10, or a plug-in standard such as BA15d or B22d. However, it may be a pin type standard such as GU5.3 or G6.35.

  The lighting device of the present invention can be particularly used in the field of lighting in a low temperature environment.

It is a fragmentary sectional view which shows the structure of the illuminating device 100 which concerns on embodiment of this invention. It is sectional drawing which expands and shows the protrusion part 146 and the nozzle | cap | die 160 periphery. It is sectional drawing which shows the other form of arrangement | positioning of 170 A of lead wires. It is a front view of LED board 120.

Explanation of symbols

100 ... Lighting device 110 ... LED
DESCRIPTION OF SYMBOLS 120 ... LED board 130 ... Drive circuit 140 ... Main body case 146 ... Projection part 146A ... Projection part screw 146B ... Projection end groove 146C ... Outer peripheral groove 150 ... Transparent Cover 160 ... Cap 162A ... Male screw 162B ... Female screw 170A, 170B ... Lead wire

Claims (9)

A plurality of LEDs;
A circuit for driving the plurality of LEDs;
A housing for housing the plurality of LEDs and the circuit;
A protrusion formed on a part of the casing and provided with a cylindrical male screw;
An illumination device comprising: a base including a female screw that is screwed to the male screw of the protrusion. The base has a bottomed cylindrical shape with spiral irregularities formed on the peripheral wall,
The spiral unevenness constitutes a male screw that is screwed with a female screw of the bulb socket outside the peripheral wall, and constitutes a female screw that is screwed with the male screw of the protruding portion inside the peripheral wall. And
The lighting device according to claim 1. The casing is made of polycarbonate resin,
The illumination device according to claim 1 or 2. The plurality of LEDs are arranged side by side in an annular region,
The lighting device according to claim 1. A lead wire connected to the base for supplying power to the circuit;
The protrusion includes a groove formed in an axial direction on at least a peripheral surface of the male screw of its own,
The lead wire is connected to the outer peripheral surface of the base through the groove from the inner periphery of the protrusion through the protrusion,
The lighting device according to claim 1. A lead wire connected to the base for supplying power to the circuit;
The protrusion includes a groove formed in an axial direction on at least a peripheral surface of the male screw of its own,
The lead wire is characterized in that one end of the lead wire passes between the inner periphery of the protrusion and the groove and is sandwiched between the female screw of the protrusion and the female screw of the base.
The lighting device according to claim 1. It can be lit in a temperature environment of at least 0 ° C. to −20 ° C.,
The lighting device according to claim 1. It can be lit in a temperature environment of at least 0 ° C. to −40 ° C.,
The lighting device according to claim 1. It can be lit in a temperature environment of at least 0 ° C. to −60 ° C.,
The lighting device according to claim 1.

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