JP2013214390A - Beam angle adjustment structure in led illumination lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED illumination lamp capable of carrying out adjustment of beam angles, and with a stable light distribution.SOLUTION: A straight-tube LED illumination lamp 10 includes an LED substrate 11 arranged with a plurality of LEDs 12 and a cylindrical cover 20 covering the LED substrate 11, and the cover 20 includes a light-transmitting part 25b, and the light-transmitting part 25b has a partially thick part 25c. The partially thick part 25 is formed, for instance, so that a center P2 of a lower outer periphery set above a center P1 of a lower inner periphery, and at the same time, a diameter R2 of the lower outer periphery is set larger than that R1 of the lower inner periphery.

Description

  The present invention relates to a beam angle adjusting structure in a straight tube type LED illumination lamp.

  In recent years, LED illumination lamps that are structurally compatible with existing fluorescent lamps have been proposed (see, for example, Patent Document 1).

  Such an LED illuminating lamp is formed in a cylindrical shape and has an outer shape similar to that of a conventional fluorescent lamp. The LED base is housed inside and covered with a light-transmitting cover formed of polycarbonate or the like. In general, a light diffusing material is mixed in such a cover.

JP 2011-210729 A

  In such an LED illuminating lamp, as a method of adjusting the beam angle, there is a method of providing a plurality of ribs in the form of silica gel lenses on the cover. However, in the aspect in which a plurality of ribs are provided on the cover, there is a problem that spots are formed in the illumination area.

  Therefore, an object of the present invention is to provide an LED illuminating lamp capable of adjusting a beam angle and having a stable light distribution.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

  That is, the beam angle adjusting structure in the LED illumination lamp according to claim 1 is a straight tube type LED illumination lamp including an LED substrate on which a plurality of LEDs are arranged, and a cylindrical cover that covers the LED substrate. And the said cover is provided with the light transmissive part, The said light transmissive part is provided with the uneven thickness part, It is characterized by the above-mentioned.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.

  In other words, the light transmitting portion is configured such that the center of the lower outer periphery is set higher than the center of the lower inner periphery, and the diameter of the lower outer periphery is set larger than the diameter of the lower inner periphery. A part is formed.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1.

  That is, the light transmitting portion is set so that the center of the lower outer periphery is set lower than the center of the lower inner periphery, and the diameter of the lower outer periphery is set to be smaller than the diameter of the lower inner periphery. It is characterized by forming.

  The present invention is as described above, and the light transmission portion of the cover includes a thickness variation portion. Therefore, the beam angle can be adjusted by the thickness variation portion. Further, since the surface shape is gentle, it is difficult to make spots in the illumination area, and the light distribution can be stabilized.

  In order to form the uneven thickness portion, for example, the center of the lower outer periphery of the light transmitting portion is set higher than the center of the lower inner periphery, and the diameter of the lower outer periphery is larger than the diameter of the lower inner periphery. May be set. In this way, the beam angle can be expanded.

  In order to form the uneven thickness portion, for example, the center of the lower outer periphery of the light transmitting portion is set lower than the center of the lower inner periphery, and the diameter of the lower outer periphery is made smaller than the diameter of the lower inner periphery. It may be set. In this way, the beam angle can be narrowed.

It is the side view which abbreviate | omitted (a) front view and (b) intermediate part of LED lighting. It is the partially expanded exploded view which looked at the LED illumination light from the top. It is the partially expanded exploded view which looked at the LED illumination light from the bottom. It is AA sectional drawing of a LED illumination lamp. It is AA sectional drawing of the LED illumination lamp which shows a mode that light diffuses. It is a front view of a light diffusion cover. It is a front view of the light-diffusion cover which concerns on a modification.

  As shown in FIG. 1, the LED illumination lamp 10 according to the present embodiment is a straight tube illumination lamp that is structurally compatible with a conventional fluorescent lamp, and can be connected to a conventional lamp body for a fluorescent lamp. It has become.

  The LED illumination lamp 10 includes an LED board 11 on which a plurality of LEDs 12 are arranged, a control board 40 that controls power supply to the LED board 11, and a cylindrical cover 20 that covers the LED board 11 and the control board 40. , And sockets 30 attached to both ends of the cover 20. As in the case of a conventional fluorescent lamp, the LED illumination lamp 10 is lit when power is supplied through the connection portion with the sockets 30 at both ends attached to the connection portion of the lamp body.

(LED board 11)
As shown in FIG. 3 and the like, the LED substrate 11 is a base on which a plurality of LEDs 12 are mounted on the surface. A capacitor 13 that stores electricity to be supplied to the LED 12 is also mounted on the LED substrate 11.

(Control board 40)
As shown in FIG. 2 and the like, the control board 40 is a board on which transistors and the like for switching on / off of the plurality of LEDs 12 on the LED board 11 are mounted. Although not particularly illustrated, the control board 40 includes a control circuit for controlling power supplied from the outside, and supplies power to the LED board 11 via the control circuit.

(Cover 20)
As shown in FIGS. 2 and 3, the cover 20 includes a heat radiation pipe 21 as a support member that supports the LED substrate 11 downward, and a light diffusion cover 25 that is fixed to the lower side of the heat radiation pipe 21. I have. The cover 20 forms a cylindrical shape as a whole when the light diffusion cover 25 and the heat radiating pipe 21 are joined.

(Heat dissipation pipe 21)
The heat radiating pipe 21 is an aluminum extrusion mold material, and as shown in FIGS. 2 to 4, a substantially half-moon-shaped pipe portion 21 a, and a hanging portion 21 b integrally extending below the pipe portion 21 a It has. The heat radiating pipe 21 is attached so that the LED board 11 and the control board 40 are in surface contact with each other, and serves as a heat sink for radiating the heat of the board.

  The substantially half-moon shaped pipe portion 21a has a hollow inside, and the control board 40 can be slid into the hollow inside.

  The hanging part 21b protrudes downward from the flat surface of the pipe part 21a and is formed in parallel on both sides over the entire length of the cover 20 in the longitudinal direction. Nipping grooves 21c are formed at opposing positions on the inner side surfaces of the two hanging portions 21b. By inserting and sliding the LED board 11 into the holding grooves 21c, the mounting surface of the LED 12 is lowered below. The LED substrate 11 can be held so as to face. An outer groove 21d is formed on the outer surface of the two hanging parts 21b, and the light diffusion cover 25 can be attached by the outer groove 21d.

(Light diffusion cover 25)
As shown in FIGS. 2 to 4, the light diffusing cover 25 is a resin extruded mold formed in a substantially C shape. The light diffusion cover 25 as a whole constitutes a light-transmitting light transmitting portion 25b, and is formed so as to emit light emitted from the LED 12 downward and laterally.

  The open end portions on both sides of the light diffusing cover 25 protrude inward in a bowl shape, and form an engaging claw portion 25a. The light diffusing cover 25 can be attached to the heat radiating pipe 21 by inserting the engaging claw portion 25a into the outer groove 21d of the heat radiating pipe 21 described above. When the light diffusing cover 25 is attached to the heat radiating pipe 21, the engaging claws 25a on both sides are pushed away in the direction away from each other by using the elasticity of the light diffusing cover 25 and inserted into the outer groove 21d. Thereby, the engagement claw portions 25a on both sides sandwich the outer groove 21d from the outside, and the light diffusion cover 25 and the heat radiating pipe 21 are joined to each other.

(Socket 30)
The socket 30 is a bottomed cylindrical member that is attached to both ends of the cover 20, and includes a resin tubular member 31 and an electrode cap 32 that is attached to an end of the tubular member 31. .

  The cylindrical member 31 is formed in a cylindrical shape in order to be covered on the outer periphery of the end portion of the cover 20.

  The electrode cap 32 is a metal member having two pins 32a protruding therefrom. The LED illuminating lamp 10 is mounted on the lamp body by inserting and connecting the pin 32a of the electrode cap 32 to the connection portion of the lamp body, and the weight of the LED illumination lamp 10 can be supported by the pin 32a.

(About the uneven thickness portion 25c of the light diffusion cover 25)
As shown in FIG. 4, the light diffusion cover 25 described above is not a concentric circular shape having a constant thickness, but has a shape including uneven thickness portions 25 c on the lower left and right sides, and the uneven thickness portion 25 c is slightly different. It is thick. The uneven thickness portion 25c has a gently protruding outer peripheral portion, and as a result, the light of the LED 12 can be refracted and diffused as shown in FIG.

  As shown in FIG. 6, the uneven thickness portion 25c is such that the lower outer periphery center P2 is set higher than the lower inner periphery center P1, and the lower outer periphery diameter R2 is larger than the lower inner periphery diameter R1. It is formed by setting the diameter.

  In the present embodiment, the diameter R1 of the lower inner periphery and the diameter R2 of the lower outer periphery are “(lower inner periphery diameter R1) × 1.3> (lower outer periphery diameter R2)> (lower inner periphery diameter R1). For example, the diameter R1 of the lower inner circumference is set to 28 mm, and the diameter R2 of the lower outer circumference is set to 32 mm.

  Note that the shape of the uneven thickness portion 25c is not limited to the above-described shape, and may be various shapes, and may be appropriately adjusted so as to obtain a desired beam angle.

  For example, as shown in FIG. 7, it is good also as a shape provided with the thick uneven part 25c in the lower part of the light-diffusion cover 25. As shown in FIG. As for this uneven thickness part 25c, the outer peripheral part protrudes gently, and it can refract and converge the light of LED12 by this.

  As shown in FIG. 7, the uneven thickness portion 25c has a lower outer periphery center P2 set below the lower inner periphery center P1, and a lower outer periphery diameter R2 smaller than the lower inner periphery diameter R1. It is formed by being set to.

(Summary)
The present embodiment is as described above. Since the light transmitting portion 25b of the cover 20 includes the uneven thickness portion 25c, the beam angle can be adjusted by the uneven thickness portion 25c. Further, since the surface shape is gentle, it is difficult to make spots in the illumination area, and the light distribution can be stabilized.

10 LED lighting 11 LED substrate 12 LED
13 Capacitor 20 Cover 21 Radiating pipe (supporting member)
21a Pipe part 21b Hanging part 21c Nipping groove 21d Outer groove 25 Light diffusion cover 25a Engaging claw part 25b Light transmitting part 25c Thickening part 30 Socket 31 Cylindrical member 32 Electrode cap 32a Pin 40 Control board P1 Center of lower inner circumference P2 Lower outer circumference center R1 Lower inner circumference diameter R2 Lower outer circumference diameter

Claims (3)

An LED substrate on which a plurality of LEDs are disposed;
A cylindrical cover covering the LED substrate;
A straight tube type LED lighting with
The cover is provided with a light transmission part, and the light transmission part is provided with an uneven thickness part.   The light transmitting portion is configured such that the center of the lower outer periphery is set above the center of the lower inner periphery, and the diameter of the lower outer periphery is set to be larger than the diameter of the lower inner periphery. The beam angle adjusting structure in the LED illumination lamp according to claim 1, wherein the beam angle adjusting structure is formed.   The light transmission part is formed with a center portion of the lower outer periphery lower than the center of the lower inner periphery, and the diameter of the lower outer periphery is set smaller than the diameter of the lower inner periphery, thereby forming an uneven thickness portion. The beam angle adjusting structure in the LED illumination lamp according to claim 1, wherein

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