JP2014157755A - Lighting lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce grainy feeling of LEDs in an LED lamp.SOLUTION: A lighting lamp includes: a cylindrical lamp tube 51 which transmits light; a light emitting part 60 which is attached to the interior of the lamp tube 51 and on which multiple light emitting diodes (LEDs 54) are mounted; and a diffuser panel 55 which is attached to the interior of the lamp tube 51, diffuses light from the LEDs 54, and is made of glass. The diffuser panel 55 is a light transmissive glass plate on which surface treatment for light diffusion is performed. The lamp tube 51 includes a pair of tube wall holding parts 61 which are formed in a longitudinal direction of a tube inner wall, and both sides of the diffuser panel 55 are held by the pair of tube wall holding parts 61.

Description

  The present invention relates to an illumination lamp such as an LED lamp using a light emitting diode (LED).

  In a straight tube LED lamp in which a plurality of LEDs are arranged, the LED particles are often visually recognized. In particular, as the light emission luminance of individual LEDs increases due to technological improvements and the arrangement interval of the plurality of LEDs becomes longer, the LED particles are more easily visible.

JP2011-233359A JP 2011-76833 A JP 2009-15833 A

  I want to make sure that the LED particles of the LED lamp are not visible.

The illumination lamp of the present invention is
A cylindrical lamp tube that transmits light;
A light emitting part mounted inside the lamp tube and mounted with a plurality of light emitting diodes (LEDs);
A glass diffusion plate is provided which is attached to the inside of the lamp tube and diffuses light from the LED.

  In the present invention, since the glass diffusion plate is used, the graininess of the LED is reduced, and the decrease in light transmittance can be reduced.

FIG. 3 shows an illumination lamp 50 according to the first embodiment. FIG. 3 is a cross-sectional view taken along line AA of the illumination lamp 50 according to the first embodiment. FIG. 6 is a cross-sectional view taken along line AA of the illumination lamp 50 according to the second embodiment. FIG. 6 is a cross-sectional view taken along line AA of the illumination lamp 50 according to the third embodiment. FIG. 6 is a cross-sectional view taken along line AA of the illumination lamp 50 according to the fourth embodiment. FIG. 6 is a cross-sectional view taken along line AA of the illumination lamp 50 according to the fifth embodiment. FIG. 10 is a cross-sectional view taken along line AA of the illumination lamp 50 according to the sixth embodiment. FIG. 20 is a cross-sectional view of the illumination lamp 50 according to the seventh embodiment, taken along line AA.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment, the directions such as “up”, “down”, “left”, “right”, “front”, “back”, “front”, “back” are However, it is not intended to limit the arrangement or orientation of devices, instruments, parts, or the like.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an illumination lamp 50 according to the first embodiment. The illumination lamp 50 is, for example, a straight tube LED lamp using a plurality of light emitting diodes (LEDs).
The illumination lamp 50 has a cylindrical lamp tube 51. The lamp tube 51 is a transparent or translucent straight tube.

The illumination lamp 50 includes a light emitting unit 60.
The light emitting unit 60 includes a light emitting diode (LED 54), a substrate 53, and a heat sink 52.
The light emitting unit 60 is housed in the lamp tube 51 and emits light in the light emitting direction of the illumination lamp 50 (upward in FIG. 1). The light emitting unit 60 extends in the longitudinal direction of the lamp tube 51.

The heat sink 52 radiates heat from the light emitting unit 60 to the lamp tube 51.
The heat sink 52 is made of metal such as aluminum, and serves as a pedestal to which the substrate 53 is attached and a heat dissipation member. For example, the heat sink 52 adheres and fixes the substrate 53.

  A plurality of LEDs 54 are mounted on the substrate 53, and the plurality of LEDs 54 are arranged and arranged uniformly.

  The LED 54 is an example of a light source, and includes an LED (light emitting diode) alone or an LED module. The LED 54 is also referred to as an LED chip.

There are a pair of caps 57 at both ends of the lamp tube 51.
Each base 57 includes a pair of power supply terminals 58. The number and shape of the power supply terminals 58 are not limited to the example shown in the figure, and may be other numbers or shapes.

  The pair of caps 57 covers both ends of the lamp tube 51 and is fixed to both ends of the heat sink 52 of the light emitting unit 60 and both ends of the lamp tube 51.

  The illumination lamp 50 has a structure that prevents dust from entering the lamp that impairs safety during use from the viewpoint of long-term use. That is, the lamp tube 51 and the base 57 are bonded, and the light emitting unit 60 is sealed.

  The illumination lamp 50 has a tube type outer shape, and the outer shape is the same shape as a commercially available straight tube fluorescent lamp.

  FIG. 2 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.

The lamp tube 51 is a cylindrical pipe that transmits light and has a circular cross section.
The light emitting unit 60 is attached to the lower part inside the lamp tube.
The diffusion plate 55 is attached to the upper part of the light emitting unit 60 inside the lamp tube.

The diffusion plate 55 is a glass flat plate (a flat plate) that diffuses light from the LEDs 54.
The diffusion plate 55 is a translucent glass plate that has been subjected to a surface treatment for diffusing light.
As the surface treatment, sandblasting or chemical treatment (etching) is used.
In FIG. 2, the surface treatment is applied only to the surface (upper surface) of the glass plate. However, the surface treatment can be performed only on the back surface or on both surfaces.
The surface treatment may be performed on the entire surface of the glass plate, or may be performed in a circular shape on a portion where each LED 54 exists.

The lamp tube 51 has a pair of tube wall holding portions 61 formed in the longitudinal direction of the tube inner wall.
The tube wall holding portion 61 has a U shape with a recess. The diffusion plate 55 is held by the lamp tube 5 by sliding both sides into the recesses of the pair of tube wall holding portions 61 in the longitudinal direction.

  Both ends of the diffusion plate 55 are in contact with the inner wall (the bottom of the recess) of the lamp tube 51, and the diffusion plate 55 and the inner wall of the lamp tube 51 form a semicircular shape or a D-shape. In this way, the diffuser plate 55 is present up to both inner walls of the lamp tube 51, and the diffuser plate 55 is formed as an arc string formed by the inner wall, so that all the light emitting units 60 are hidden behind the diffuser plate 55. And visual aesthetics are improved. For this reason, when the width | variety of the diffusion plate 55 is large, the lamp tube 51 can be made transparent from the point of aesthetics, and the transmittance | permeability of light can be improved.

The interval between the tube wall holding portions 61 is defined as a diffusion width B. The diffusion width B is almost the same as the width of the diffusion plate 55.
The central angle from the top center of the LED 54 to both ends of the diffusion width B is θ,
The distance from the center of the top of the LED 54 to the end of the diffusion plate 55 (the end of the diffusion width B) is a,
The distance from the top center of the LED 54 to the surface (diffusion surface) of the diffusion plate 55 is c,
Assuming that half of the diffusion width B is b, the relationship is as follows.
b / a = sin (θ / 2)
b = a × sin (θ / 2)
Diffusion width B = b + b = 2b = 2 × a × sin (θ / 2)

  The light distribution angle of the LED 54 is H. The light distribution angle H of the LED 54 is an angle at which a light intensity of 50% is obtained when the peak value of the light intensity of the light emitted from the LED 54 is 100%. For example, the light distribution angle H refers to an angle at which the brightness is halved compared to the brightness of the optical axis (center) of the LED 54.

The central angle θ is an angle that is at least one half and two times or less the light distribution angle H.
Light distribution angle H ÷ 2 ≦ Center angle θ ≦ Light distribution angle H × 2
In other words, the diffusion plate 55 has a diffusion width B for diffusing light having an angle θ that is not less than one half and not more than twice the light distribution angle H of the LED 54. In other words, the length c is adjusted so that the diffusion width B can be secured.

  If the central angle θ is set to be an angle that is twice that of the light distribution angle H (assuming that the central angle θ = the light distribution angle H), the light having a brightness that is more than half the brightness of the optical axis (center) of the LED 54. Are all diffused, and efficient diffusion can be achieved.

  In order to reduce the graininess of the LED 54, the length c should be as long as possible, and the LED 54 should be as far away from the diffusion plate 55 as possible. That is, the position of the LED 54 is preferably a position deeper than the center of the lamp tube 51 in the light emitting direction of the lamp tube 51 (a position below the center of the lamp tube 51 in FIG. 2).

Further, in order to increase the diffusion by the diffusion plate 55, the diffusion width B in the lamp tube 51 may be maximized. That is, the diffusion width B may be the same as the diameter of the lamp tube 51.
Diffusion width B = diameter of lamp tube 51 d = radius r × 2 of lamp tube 51

  Here, assuming that the central angle θ = the light distribution angle H = 90 degrees, the triangle composed of the sides a, b, and c in FIG. 2 is a right-angled isosceles triangle (b = c = r), and the LED 54 is almost It is located on the inner surface of the tube wall, and the length c is maximized and the diffusion width B is maximized, so that the graininess can be reduced.

  Here, assuming that the central angle θ = the light distribution angle H = 120 degrees, the triangle formed by the sides a, b, and c in FIG. 2 is a right triangle (c <b = r), and the length c is short. However, the diffusion width B is maximized.

The material of the diffusion plate 55 is glass, but may be resin.
The material of the lamp tube 51 is resin or glass.

There are the following four combinations of materials.
A type. Diffusion plate 55 = glass and lamp tube 51 = resin B type. Diffusion plate 55 = resin and lamp tube 51 = glass C type. Diffusion plate 55 = glass and lamp tube 51 = glass D type. Diffuser 55 = resin and lamp tube 51 = resin

By using glass, it is possible to avoid coloring due to aging that occurs in the resin, and to suppress a decrease in luminous flux.
In addition, since glass has better light transmittance than resin, it is less colored even after a long period of time, and a bright light diffusion plate can be realized.
However, glass is heavier than resin. Moreover, glass is easy to break.

Due to the above-described lengths of materials, it is desirable that the diffusion plate 55 be made of glass and the lamp tube 51 be made of resin.
That is, as in the A type, the outer shell is preferably made of a light and strong resin, and the inner diffusion plate 55 is preferably made of glass that can realize a light light diffusion plate that is slightly heavier.
If the material of the diffuser plate 55 is resin and the material of the lamp tube 51 is glass as in the case of the B type, the diffuser plate 55 is heavy and easily damaged, and the diffuser plate 55 reduces the luminous flux due to coloring due to aging. It will be easy to invite.
In the case of the C type, it is heavy and easily damaged, but a bright light diffusion plate can be realized.
In the case of the D type, it is light and strong, but the diffusion plate 55 tends to cause a decrease in light flux due to coloring due to aging.

The first embodiment is characterized by a tube-type LED light source having a first light transmitting part (lamp tube 51) and a second light transmitting part (diffusion plate 55).
The first translucent part has a tube shape, and the second translucent part is installed inside the first translucent part. The second light transmitting part is glass that diffuses light.
If the first light transmitting part and the second light transmitting part are provided, the transmittance may decrease and the lamp may become dark each time light is transmitted through the first light transmitting part and the second light transmitting part. Although it exists, since the diffused glass is used for the second light transmitting portion, a decrease in transmittance can be suppressed.
The second light transmitting part is glass that uses a glass that diffuses light and has a roughened glass surface. The glass surface treatment is performed by sandblasting or chemical treatment (etching).
The translucent glass of the 2nd translucent part is installed by the tube wall holding part provided in the translucent tube of the 1st translucent part.
Or the translucent glass of the 2nd translucent part is installed by the sink holding | maintenance part of the heat sink provided in the translucent tube of the 1st translucent part.
The translucent glass may be flat or curved.
The first translucent part may be transparent as long as it has translucency. If it is transparent, the transmittance increases.

  According to this Embodiment 1, since the 2nd translucent part (diffusion board 55) has a spreading | diffusion function, the graininess of LED54 reduces. Moreover, since the 2nd translucent part (diffusion plate 55) is glass, the reduction | decrease in the transmittance | permeability can be suppressed.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.
Hereinafter, differences from the first embodiment will be mainly described.

The heat sink 52 has a pair of sink holding portions 62 formed in the longitudinal direction.
The diffusion plate 55 is held on both sides by a pair of sink holding parts 62.

  The sink holding part 62 is provided at the upper part of both ends of the heat sink 52. The sink holding part 62 has a U shape with a recess. The diffusion plate 55 is held by the heat sink 52 by sliding both sides into the recesses of the pair of sink holding portions 62 in the longitudinal direction.

Embodiment 3 FIG.
4 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.
Hereinafter, differences from the first embodiment will be mainly described.

The diffusion plate 55 is a U-shaped curved plate.
The heat sink 52 fixes both sides of the diffusion plate 55.

Embodiment 4 FIG.
FIG. 5 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.
Hereinafter, differences from the first embodiment will be mainly described.

The diffusion plate 55 is a U-shaped half-pipe curved plate.
The diffusing plate 55 may be a dome-shaped or hemispherical curved plate covering the individual LEDs 54.
The substrate 53 fixes both sides or ends of the diffusion plate 55.

Embodiment 5 FIG.
FIG. 6 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.
Hereinafter, differences from the first embodiment will be mainly described.

FIG. 6 is a combination of FIG. 4 and FIG. 5, and shows a case where there are two diffusion plates 55 on the outer side and the inner side.
The heat sink 52 fixes both sides of the outer diffusion plate 55. The substrate 53 fixes both sides of the inner diffusion plate 55.

Embodiment 6 FIG.
FIG. 7 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.
Hereinafter, differences from the first embodiment will be mainly described.

In FIG. 7, a half-pipe type diffusion plate 55 is attached to the inner wall of the lamp tube 51.
The outer diameter of the diffusion plate 55 is the same as the inner diameter of the lamp tube 51.
The diffusion plate 55 is held by the lamp tube 51 by being slid and inserted in the longitudinal direction.
Both ends of the half-pipe type diffusion plate 55 reach a convex tube wall holding portion 64, and the diffusion plate 55 is fixed to the lamp tube 51 by a pair of tube wall holding portions 64 and the inner wall of the lamp tube 51. ing.

Embodiment 7 FIG.
FIG. 8 is a cross-sectional view taken along line AA of the illumination lamp 50 of FIG.
Hereinafter, differences from the first embodiment will be mainly described.

In FIG. 8, a pipe-type diffusion plate 55 is attached to the inner wall of the lamp tube 51.
The outer diameter of the diffusion plate 55 is the same as the inner diameter of the lamp tube 51.
The diffusion plate 55 is held by the lamp tube 51 by being slid and inserted in the longitudinal direction.
The pipe-type diffusion plate 55 is fixed to the lamp tube 51 by the inner wall of the lamp tube 51.

Embodiment 8 FIG.
Any two or more of FIGS. 2 to 8 may be combined.
The illumination lamp 50 is not limited to a straight tube LED lamp, but may be a ring LED lamp, or an LED lamp having another shape such as an L shape or a U shape. Alternatively, a bulb-type LED lamp may be used.

  50 illumination lamp, 51 lamp tube, 52 heat sink, 53 substrate, 54 LED, 55 diffuser plate, 56 feeding terminal, 57 base, 60 light emitting unit, 61 tube wall holding unit, 62 sink holding unit, 64 tube wall holding unit.

Claims (6)

A cylindrical lamp tube that transmits light;
A light emitting part mounted inside the lamp tube and mounted with a plurality of light emitting diodes (LEDs);
An illumination lamp comprising a glass diffusion plate attached to the inside of a lamp tube and diffusing light from the LED.   2. The illumination lamp according to claim 1, wherein the diffusion plate is a translucent glass plate that has been subjected to a surface treatment for diffusing light. The lamp tube has a pair of tube wall holding portions formed in the longitudinal direction of the tube inner wall,
The illumination lamp according to claim 1 or 2, wherein the diffusion plate is held by a pair of tube wall holding portions. The illumination lamp has a heat sink that dissipates heat from the light emitting unit,
The heat sink has a pair of sink holding portions formed in the longitudinal direction,
The illumination lamp according to claim 1 or 2, wherein the diffusion plate is held by a pair of sink holding portions.   5. The illumination according to claim 1, wherein the diffusion plate has a diffusion width B for diffusing light having an angle θ that is not less than 1/2 and not more than twice the light distribution angle H of the LED. lamp.   The illumination lamp according to claim 1, wherein the diffusion plate is a flat plate or a curved plate.

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