JP2017027664A - Straight pipe type led lamp and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a straight pipe type LED lamp capable of performing a sufficient EMI countermeasure without producing any cost-up in a fine elongated product shape.SOLUTION: Connector terminals 4a to 4d connected to an outer power supply 16 are connected to a metallic frame 2 acting as a heat sink arranged in a resin cover through capacitors 18, 20 acting as EMI countermeasure. A diode bridge 22 and a smoothing capacitor 24 are connected between the terminals 4a to 4d and LED element 14. A virtual gland 26 between negative pole side of LED element 14 and the diode bridge 22 is connected to the metallic frame 2. Since it is connected to the metallic frame 2 from the power supply line through a capacitor for EMI countermeasure, so that the metallic frame 2 can be assumed as one acting as an earth, resulting in that a similar effect as that of practical installation of Y-capacitor can be obtained. Concurrently, a potential of the virtual gland 26 is also connected to the metallic frame 2 to enable a stable potential to be obtained and this state contributes to a reduction of electrical noise [EMI].SELECTED DRAWING: Figure 3

Description

  The present invention relates to a straight tube LED lamp and a lighting device.

As countermeasures for EMI (Electromagnetic Interference), which is electrical noise emitted from electrical products, methods of stabilizing the potential and adding a capacitor (Y capacitor) between the power line and the ground are known. .
In Patent Document 1, as a measure against EMI and EMS (Electromagnetic Susceptibility), a ground connection pattern is formed on the power supply board, and the ground connection pattern is electrically connected to the heat sink and the base case via screws. Thus, there is described an LED lamp with a speaker that constitutes an electrical ground of an insulated power supply circuit and that achieves EMC (Electromagnetic Compatibility) from the viewpoint of electromagnetic shielding.

Straight tube type LED lamps, except for special structures, generally cannot be grounded due to their structure, and because the product shape is long and narrow, the stabilization of potential within a small area power supply board is ensured accordingly. Therefore, there were many restrictions in implementing EMI countermeasures.
That is, since the straight tube type LED lamp cannot be connected to the ground, it is impossible to mount the Y capacitor, and many other EMC filter parts (such as an X capacitor and a common mode coil) are mounted to reduce noise.
In addition, since a stable potential could not be secured, measures such as securing a potential stabilization using a copper foil tape were taken, but this resulted in an increase in parts and an increase in cost.

  The present invention has been made in view of such a current situation, and a main object of the present invention is to provide a straight tube LED lamp capable of implementing sufficient EMI countermeasures without increasing costs in an elongated product shape. .

  In order to achieve the above object, a straight tube LED lamp of the present invention includes a cylindrical resin cover, a power supply terminal, a base fixed to both ends of the resin cover, and the resin cover. A conductive frame that is disposed and extends along the longitudinal direction of the resin cover, and a power supply board that is disposed through an insulating member at a portion necessary for the conductive frame and is supplied with power from an external power source through the base And an LED element disposed on the conductive frame and connected to the power supply board, at least a portion of the resin cover facing the LED element is translucent, and the power supply board has a potential. It is electrically connected to the conductive frame so as to achieve stabilization of the above.

  ADVANTAGE OF THE INVENTION According to this invention, the straight tube | pipe type LED lamp which can implement a sufficient EMI countermeasure can be provided, without coming in cost increase in the elongate product shape.

It is a disassembled perspective view of the illuminating device which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of a straight tube | pipe type LED lamp. It is a circuit diagram which shows the connection structure of a power supply board and metal frames.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing the appearance of the lighting device 200. The lighting device 200 includes a straight tube LED lamp 100 and a lighting fixture (lamp) 150 on which the straight tube LED lamp 100 is mounted.
The lighting fixture 150 is the same as a fixture for lighting a fluorescent lamp, and the terminals 4a to 4d as power feeding terminals of the straight tube LED lamp 100 are inserted in accordance with the hole positions of the sockets 151a and 151b.
Current flows from the terminals 4a to 4d from the commercial power source to LEDs to be described later in the straight tube LED lamp 100, and the straight tube LED lamp 100 is turned on.

  The straight tube LED lamp 100 includes an elongated cylindrical (cylindrical) resin cover 3 and terminals 4 a to 4 d, and includes caps 1 a and 1 b that are fixed to both ends of the resin cover 3. The terminal 4c is provided at a position corresponding to the terminal 4a of the base 1b.

FIG. 2 is a view showing a cross section in a direction orthogonal to the longitudinal direction of the straight tube LED lamp 100.
Inside the resin cover 3, a metal frame 2 is disposed as a conductive frame extending along the longitudinal direction of the resin cover 3. The metal frame 2 is formed integrally with each of the vertical portions 2b, the horizontal portion 2a positioned at the center of the resin cover 3 and extending horizontally, the vertical portions 2b rising vertically from both ends of the horizontal portion 2a, and facing outward. It has a two-stage protruding portion 2c that protrudes horizontally and a female screw portion 2d that is integrally formed at the upper end of each vertical portion 2b.
The bases 1a and 1b are fixed to the end of the resin cover 3 by screwing two screws 5 shown in FIG.

As shown in FIG. 2, a recess 3a is formed on the inner side of the resin cover 3 by a two-step projection, and the metal frame 2 is fitted into the recess 3a by fitting the protrusion 2c into the resin cover 3. It is supported by.
The outer side of the female screw portion 2 d of the metal frame 2 is covered with a projecting piece 3 b that hangs down in an arc shape inside the resin cover 3.

On the upper surface of the horizontal portion 2a of the metal frame 2, a power supply board 10 on which an electronic component 8 equipped with a drive circuit for LED elements and the like is mounted is disposed in a state where necessary portions are insulated by an insulating member 12. . The power supply board 10 is supplied with electric power from an external power supply described later via a base.
A plurality of LED elements 14 are arranged in the longitudinal direction on the lower surface of the metal frame 2, and the LED elements 14 are connected to a drive circuit of the power supply substrate 10.
An uneven heat dissipation portion 3 c is formed on the outer peripheral surface of the upper portion of the resin cover 3, and a diffusion portion 3 d made of prismatic unevenness for diffusing light emitted from the LED element 14 is formed on the inner peripheral surface of the lower portion. Is formed.

  In the present embodiment, the resin cover 3 is integrally formed in a cylindrical shape with the same resin material having translucency, but the upper half and the lower half that is the portion facing the LED element 14 are made of different resins. It is good also as a structure which forms with material and has translucency only in a lower half part. In this case, the lower half of the resin material may contain a diffusing material to impart light diffusibility.

FIG. 3 is a circuit diagram for stabilizing the potential by electrically connecting the power supply substrate 10 and the metal frame 2.
The terminals 4a to 4d of the caps 1a and 1b connected to the external power source 16 via the sockets 151a and 151b are connected to the metal frame 2 via the capacitors 18 and 20 for EMI countermeasures.
A diode bridge 22 as a rectifier and a smoothing capacitor 24 are connected between the terminals 4 a to 4 d and the LED element 14.
A virtual ground (virtual GND) 26 between the negative electrode side of the LED element 14 and the diode bridge 22 is connected to the metal frame 2.

Since the power supply line is connected to the metal frame 2 via an EMI countermeasure capacitor that suppresses electromagnetic interference, the metal frame 2 can be regarded as equivalent to ground, and is the same as mounting a Y capacitor. The effect of can be obtained.
At the same time, the potential of the virtual ground 26 is connected to the metal frame 2 to stabilize the potential, thereby contributing to reduction of electrical noise (EMI).
In this way, the power supply board 10 is electrically connected to the metal frame 2 that exists as a heat sink to stabilize the potential, so that the EMI countermeasure can be satisfactorily achieved even in a straight tube type LED lamp that cannot be connected to the ground. Can be implemented.
Since the metal frame 2 provided as a permanent configuration of the straight tube LED lamp is used for stabilizing the potential, the parts cost can be reduced compared to the conventional configuration using a copper foil tape or the like, and the resin cover 3 can be saved. Space can be realized.

The metal frame 2 and the power supply board 10 may be connected by, for example, a leaf spring, or a harness with a round terminal may be connected to the frame by screws.
As the material of the metal frame 2, an aluminum alloy or a magnesium alloy is often used, but other metal materials may be used.
Further, the frame is not limited to metal, and may be a frame made of a conductive material as long as the above-described potential stabilization is obtained.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and unless specifically limited by the above description, the present invention described in the claims is not limited. Various modifications and changes are possible within the scope of the gist.
The effects described in the embodiments of the present invention are merely examples of the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

DESCRIPTION OF SYMBOLS 1a, 1b Base 2 Metal frame as conductive frame 3 Resin cover 4a-4d Terminal as power supply terminal 10 Power supply board 14 LED element 16 External power supply 18, 20 Capacitor 22 Diode bridge as rectifier 24 Smoothing capacitor 26 Virtual ground 100 straight tube type LED lamp 150 lighting fixture 200 lighting device

JP 2013-140751 A

Claims (4)

A cylindrical resin cover;
A base having a power feeding terminal and fixed to both ends of the resin cover;
A conductive frame disposed within the resin cover and extending along a longitudinal direction of the resin cover;
A power supply board that is disposed through an insulating member at a site necessary for the conductive frame, and that is supplied with power from an external power source through the base,
LED elements disposed on the conductive frame and connected to the power supply board;
With
A portion of the resin cover facing at least the LED element has translucency,
A straight tube type LED lamp in which the power supply substrate is electrically connected to the conductive frame so as to obtain stabilization of potential. In the straight tube | pipe type LED lamp of Claim 1,
The power supply terminal that is a power line is connected to the conductive frame via a capacitor for suppressing electromagnetic interference, and a rectifier and a smoothing capacitor are connected between the power supply terminal and the LED element, A straight tube type LED lamp in which a virtual ground between a negative electrode side of an LED element and the rectifier is connected to the conductive frame. The straight tube type LED lamp according to claim 1 or 2,
A straight tube type LED lamp in which the conductive frame is a metal frame.   The illuminating device provided with the straight tube | pipe type LED lamp as described in any one of Claims 1-3, and the lighting fixture which mounts | wears with the said straight tube | pipe type LED lamp.

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