JP2014175275A - Straight tube type led lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a straight tube type LED lamp which irradiates a rear side of a substrate with light as well, and which can reduce a dark part on a ceiling side.SOLUTION: A straight tube type LED lamp includes: a plurality of LEDs; LED substrates mounted with the plurality of LEDs; a heat sink provided with the plurality of pieces of LED substrates; a cylindrical lamp cover for accommodating the LED substrates and the heat sink; a base installed at both end parts in the longitudinal direction of the lamp cover. At least two pieces of substrates out of the plurality of pieces of LED substrates are provided in such a manner that one substrate has an angle with respect to the other, and also, there is space between an end part of each of the two substrates and the lamp cover.

Description

  The present invention relates to a straight tube LED lamp.

  As a lighting device provided with a straight tube, a straight tube fluorescent lamp has been known. However, from the viewpoint of extending the life and saving energy, a light emitting element such as an LED (Light Emitting Diode) is used as a straight tube. A straight tube LED lamp housed in the body has been proposed (see Patent Document 1). In addition, a straight tube LED lamp has been proposed in which a substrate on which a light emitting element (LED) is mounted is disposed inside a cover formed in a light-transmitting cylindrical shape (see Patent Document 2).

  Compared to straight tube fluorescent lamps, straight tube LED lamps can achieve longer life and energy saving, while straight tube fluorescent lamps can illuminate the entire range of 360 degrees, whereas LED light sources Has a strong directivity, the straight tube LED lamp cannot illuminate all directions, and the ceiling side may become dark. In a state in which a pair of substrates on which a plurality of light emitting elements (LEDs) are mounted is viewed in the axial direction (a direction penetrating the paper surface) of a light-transmitting cylindrical lamp cover that accommodates them, the fan has a sectional fan shape. Thus, a technique for irradiating light as uniformly as possible is disclosed. (See Patent Document 3)

JP 2011-108378 A JP 2011-29051 A JP 2012-164541 A

  In the straight tube type LED lamp described in Patent Document 3, light cannot be irradiated to the rear side (ceiling side) of the two-sheet board installed so as to have a fan-shaped cross section, and a shadow is generated. There is a risk of dark areas.

  An object of the present invention is to provide a straight tube type LED lamp capable of irradiating light on the back side of a substrate and reducing a dark part on a ceiling side.

  In the present invention, in order to solve the above problems, a plurality of LEDs, an LED substrate on which the plurality of LEDs are mounted, a heat sink provided with a plurality of the LED substrates, and a cylinder that accommodates the LED substrate and the heat sink In a straight tube type LED lamp comprising a lamp cover having a shape and a base attached to both ends in the longitudinal direction of the lamp cover, at least two of the plurality of LED substrates are one of The substrate is provided so that the substrate has an angle with respect to the other substrate, and a space is provided between the respective ends of the two substrates and the lamp cover.

  ADVANTAGE OF THE INVENTION According to this invention, the straight tube | pipe type LED lamp which can irradiate light also to the back side of a board | substrate and can make the dark part of a ceiling side small can be provided.

Overall perspective view of straight tube type LED lamp 1 Exploded perspective view of straight tube type LED lamp 1 Exploded perspective view of straight tube type LED lamp 1 Transparent perspective view of straight tube type LED lamp 1 Axial sectional view of straight tube type LED lamp 1 5 is an axial sectional view of a straight tube type LED lamp 1 in another embodiment of FIG. 5 is an axial sectional view of a straight tube type LED lamp 1 in another embodiment of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted. In the text and drawings, the upper side indicates the ceiling side, and the lower side (rear side) indicates the side opposite to the ceiling side.

  1-5 has shown the straight tube | pipe type LED lamp 1 concerning a present Example. FIG. 1 is an overall perspective view of a straight tube type LED lamp 1. 2 and 3 are exploded perspective views of the straight tube type LED lamp 1. FIG. 4 is a transparent perspective view of the straight tube type LED lamp 1. The straight tube type LED lamp 1 of the present embodiment includes two LED substrates 3 on which a plurality of light emitting elements (LEDs) 2 are mounted, a heat sink 4, a lamp cover 5, a base 6, and a support column 7. The straight tube LED lamp 1 is formed in an elongated cylindrical shape as a whole.

  The LED substrate 3 is made of, for example, glass epoxy resin and has a long rectangular shape that can be inserted into the lamp cover 5 along the axial direction (longitudinal direction) of the lamp cover 5. As shown in FIG. 5, when the inside of the lamp cover is viewed from the axial direction (longitudinal direction) of the lamp cover 5, the two LED substrates 3 form a substantially triangular shape in the internal space of the lamp cover 5. So that it is housed. That is, the two LED boards 3 are provided in the internal space of the lamp cover 5, and one of the two LED boards 3 is provided with an angle with respect to the other. In this embodiment, this angle is substantially a right angle. The two long rectangular LED boards 3 are provided so that the ends on one long side of the two LED boards 3 are adjacent to each other. Further, the LED substrate 3 is provided so as to have a space 10 between the other long side end of the LED substrate 3 and the lamp cover 5. The two LED boards 3 are generally provided in the upper semicircular region when the internal space of the lamp cover 5 is divided into two parts up and down by a line along the diameter (a straight line indicated by an imaginary line in FIG. 5). The mounted LED 2 is provided so as to face the lamp cover 5 side. As described above, the light emitted from each LED substrate 3 is irradiated in various directions. For example, light that irradiates through the lamp cover 5 from the interior space of the lamp cover 5 so as to travel outward and downward of the lamp cover 5, or is reflected by the lamp cover 5 and travels upward on the rear side of the LED substrate 3. The light to irradiate, the light which guides the lamp cover 5, and irradiates so that it may progress upwards which are the back side of LED board 3 etc. can be considered. By providing the two LED substrates 3 so as to intersect with each other at an angle, there is an effect that light can be irradiated not only on the lower side but also on the upper side. By providing the space 10, it is possible to prevent the upward light irradiation from being blocked by the substrate and to increase the amount of upward light irradiation. Since the two LED boards 3 are positioned above half in the internal space of the lamp cover 5, an effect of increasing the amount of light irradiation in the upward direction is obtained. The amount of light irradiation in the upward direction is increased by making the two LED substrates 3 intersect at an angle and so as to be positioned above half in the internal space of the lamp cover 5. There is an effect that can be.

  A heat sink 4 is provided on the back surface of the LED substrate 3. The heat sink 4 is disposed in a space surrounded by the two-piece LED board 3. The heat sink 4 is made of aluminum, for example, and has a triangular prism shape. Two LED substrates 3 are mounted on two of the three sides of the heat sink 4. In the present embodiment, the LED substrate 3 and the heat sink 4 are bonded with an adhesive, but this is not restrictive. Since the heat sink 4 only needs to hold the LED substrate 3 and have the effect of diffusing heat from the LED substrate 3, the heat sink 4 may be provided with a holding portion for the LED substrate 3. It may be integrated. The lamp cover 5 is made of, for example, polycarbonate resin, and is formed into an elongated cylindrical shape by extrusion molding. Both end portions of the lamp cover 5 in the axial direction (longitudinal direction) are open, and both end portions of the lamp cover 5 are in a cylindrical shape having communication and an internal space. The lamp cover 5 only needs to protect the two LED substrates 3 and have translucency. Therefore, as long as it has translucency, the lamp cover 5 may be transparent or milky white. Moreover, the effect which diffuses the light from each LED board 3 is show | played by making the lamp cover 5 milky white or putting a light-diffusion material.

  The base 6 is a part that fits into an insertion port of a general fluorescent lamp lighting fixture, and includes a terminal pin 8 for holding the straight tube LED lamp 1. The base 6 is attached to both ends in the axial direction (longitudinal direction) of the lamp cover 5, and comes into contact with the heat sink 4 integrated with the two-piece LED substrate 3, and ribs 9 for positioning and fixing the same. Are provided integrally.

  The column 7 has an effect of preventing deflection with respect to the heat sink 4 having a long dimension in the longitudinal direction such as a 110 lamp. The support column 7 only needs to have a function of connecting the heat sink 4 and the lamp cover 5, and may be integrated with the heat sink 4 or the lamp cover 5, or may be a separate part. Here, when the support column 7 is molded of resin so as to be integrated with the lamp cover 5, the support column 7 can also transmit light, and the effect of increasing the irradiation to the ceiling side can be achieved. Further, as the width of the column 7 as viewed in the axial direction of the lamp cover 5 becomes narrower, as shown in FIG. 2, a larger space 12 through which light enters can be secured. An increase in light irradiation can be expected.

  In addition, as shown in FIG. 6, when the width of the support column 7 is increased, the strength of supporting the heat sink 4 is increased.

  Further, as shown in FIG. 7, in the case where the heat sink 4 has a short dimension in the longitudinal direction, such as a 40-type lamp and a 20-type lamp, the support 7 may not be provided as shown in FIG. 4. In this case, the heat sink 4 is fixed by the rib 9 of the base 6. In the case where the support column 7 is not provided, the space 11 into which light enters in addition to the space 12 can be secured, so that an increase in irradiation to the ceiling side can be expected.

  Next, the operation of the straight tube LED lamp 1 of the present embodiment will be described.

  In this straight tube type LED lamp 1, for example, light from the right LED board 3 shown in FIG. 2 travels from the inside of the lamp cover 5 to the lower right side and the rear side of the right board. Is transmitted to the lower right side and to the right substrate side. On the other hand, the light from the left LED substrate 3 shown in FIG. 2 travels from the inside of the lamp cover to the lower left side and the rear side of the left substrate, and further passes through the periphery of the lamp cover 5 to the lower left and left substrates. Irradiated.

  For example, when the straight tube LED lamp 1 is attached to the lighting fixture in a posture in which the upper semicircular region is on the ceiling side, light is irradiated in a wide range from the ceiling side toward the indoor space below.

  Therefore, according to the straight tube type LED lamp 1 of this embodiment, even if each light emitting element (LED) 2 has directivity of light, light is irradiated in a wide range from the ceiling side toward the indoor space below. Therefore, the dark part on the ceiling side can be reduced.

  The specific configuration of each part of the straight tube LED lamp 1 according to the present invention can be varied in design in various ways. For example, the lamp cover 5 may have an opening in the vicinity of the heat sink 4, and a part of the heat sink 4 may be exposed from the lamp cover 5.

  The LED substrate 3 and the heat sink 4 may be bonded to each other. The LED substrate 3 in the straight tube LED lamp 1 is not limited to two as long as at least two substrates are provided in a substantially triangular shape. A plurality of LED substrates may be provided.

  A light guide that diffuses the light from the LED substrate outward may be provided in the internal space of the lamp cover 5.

1 Straight tube type LED lamp 2 Light emitting element (LED)
3 LED board 4 heat sink 5 lamp cover 6 base 7 support 8 terminal pin 9 rib 10, 11, 12 space

Claims (4)

A plurality of LEDs, an LED substrate on which the plurality of LEDs are mounted, a heat sink provided with a plurality of the LED substrates, a cylindrical lamp cover for housing the LED substrate and the heat sink, and a length of the lamp cover In a straight tube LED lamp provided with a base attached to both ends in the direction,
At least two of the plurality of LED substrates are arranged such that one substrate has an angle with respect to the other substrate and between each end of the two substrates and the lamp cover. A straight tube type LED lamp characterized by having a space.   The LED board is disposed in one semicircular region obtained by dividing the internal space of the lamp cover by a line along the diameter in a state where the interior of the lamp cover is viewed in the axial direction. Straight tube LED lamp.   The straight tube LED lamp according to claim 2, wherein the LED substrate is installed so that a mounting surface of the light emitting element (LED) is directed to a semicircular region which is the other of the one semicircular region. .   The straight tube LED lamp according to claim 3, wherein a heat sink is provided on a back surface of the mounting surface.