JP2015111497A - Lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of luminance irregularity and color irregularity on a radiated surface in a lamp of a type in which a plurality of semiconductor light-emitting elements is arranged on a light-emitting module and light is converged by a reflector.SOLUTION: A light-emitting module 20 is configured so that a plurality of LED elements 22 is arranged on a front surface of a module substrate 21. A reflector 30 includes a reflection surface 31 that is a smooth, spherical inner surface so as to control reflection light. A light diffusion plate 40 is a dome optical component for diffusing light emitted from each LED element 22, and attached forward of the module substrate 21 so as to cover entirely the light-emission side of the arranged LED elements 22.

Description

  The present invention relates to a lamp including a semiconductor light emitting element such as an LED (light emitting diode), and more particularly to a reflector type lamp that focuses light with a reflector.

In recent years, lamps using semiconductor light-emitting elements such as LEDs (light-emitting diodes) as a light source, such as light bulb-shaped LED lamps, have been adopted in various lighting devices.
This LED lamp is provided with a light emitting module in which an LED element is mounted on a substrate as disclosed in Patent Document 1, for example.
In conventional incandescent bulbs and halogen lamps, there are types of spotlights and display illuminations in which light from a light source is focused and emitted within a certain range by a reflector or a condenser lens. Also in LED lamps, as a lamp used for similar applications, a cup-shaped reflector that reflects light from the LED element is provided around a light emitting module that emits white light, and the light emitted from the LED element is reflected. Reflector type LED lamps for focusing are developed.

The LED lamp is required to have a high brightness, and in order to respond to the demand, many LED lamps are arranged in a light emitting module.
In many reflector type LED lamps, a single LED element is used as a light source, but there is also a reflector type LED lamp in which a plurality of LED elements are arranged in a light emitting module.

JP 2010-170977 A

However, in the reflector type lamp in which a plurality of semiconductor light emitting elements are arranged in the light emitting module as described above, when the light from each semiconductor light emitting element is reflected and focused by the reflector, a spot is formed on the irradiation surface. The spots formed by the semiconductor light emitting elements are formed at positions shifted from each other, and uneven brightness and shadows are likely to occur on the irradiated surface.
If luminance unevenness or shading occurs on the irradiated surface in this way, suitability as an illumination light source may be impaired, for example, aesthetics may be impaired.

Further, in a reflector type lamp in which a plurality of semiconductor light emitting elements are arranged in a light emitting module, when a transparent cover or a condensing lens is mounted in front of a reflector, the light is dispersed into color components, and the uneven color on the irradiated surface. May occur, and the aesthetics may be impaired.
Here, if the plurality of semiconductor light emitting elements are arranged at a high density in a narrow range in the light emitting module in order to suppress the luminance unevenness, the plurality of semiconductor light emitting elements approach the point light source, so that the luminance unevenness can be suppressed. Conceivable.

However, the temperature of a semiconductor light emitting element such as an LED element increases due to heat generation during driving, and the light emission efficiency decreases as the temperature increases. Therefore, there is a practical limit to increasing the density of arranging a plurality of semiconductor light emitting elements. is there.
In view of the above problems, the present invention provides a lamp of a type in which a plurality of semiconductor light-emitting elements are arranged in a light-emitting module and focuses light with a reflector, thereby suppressing occurrence of luminance unevenness and color unevenness on an irradiation surface. It is in.

In order to achieve the above object, in a lamp according to the present invention, a light emitting module in which a plurality of semiconductor light emitting elements are arranged on a substrate, and a light diffusion covering the entire light emitting side of the plurality of arranged semiconductor light emitting elements. The plate and a reflecting member having a reflecting surface for reflecting the light emitted from the light emitting module and passing through the light diffusing plate to focus the reflected light are provided.
In the lamp, it is preferable to set as follows.

The light diffusing plate is formed in an arc shape in which a cross section cut by a plane orthogonal to the substrate spans two or more of the plurality of semiconductor light emitting elements and projects in the light emitting direction.
The reflection surface has an arc shape in which a cross section cut across a surface orthogonal to the substrate extending over two or more of the plurality of semiconductor light emitting elements extends in the light emitting direction.
The reflecting surface is a curved surface curved in a cup shape, and the light diffusing plate is formed in a dome shape that projects in the light emitting direction from the bottom side of the reflecting surface.

The width of the light diffusing plate in the direction along the substrate is set to 0.7 or less with respect to the width of the light emitting side opening in the reflecting surface in the same direction.
The distance from the semiconductor light emitting element to the light diffusing plate in the light emitting direction is set to 0.6 or less with respect to the distance from the substrate to the light emitting side opening of the reflecting surface.
The light emitting module and the reflecting member are fixed to one end side of the body portion that supports the light emitting module and the reflecting member, and a connecting member that receives electric power for lighting the light emitting module from the outside is attached to the other end side of the body portion.

In the lamp according to the present invention, the light emitted from each of the plurality of semiconductor light emitting elements is diffused by the light diffusing plate and is emitted so as to emit light from the surface of the light diffusing plate. The later light becomes like light emitted from “one light source” in a pseudo manner.
Accordingly, the light emitted from each of the plurality of semiconductor light emitting elements passes through the light diffusing plate, is reflected by the reflecting surface and is well focused, and the spot formed on the irradiation surface is also one spot as a whole. Therefore, uneven brightness and shading on the irradiated surface can be suppressed.

1 is a partially cutaway perspective view showing a configuration of an LED lamp 1 according to Embodiment 1. FIG. 1 is an exploded perspective view of an LED lamp 1. FIG. In embodiment and a comparative example, it is a figure which shows the light ray reflected by a reflective surface. It is a figure which shows a mode that a spot is formed in an irradiation surface in the LED lamp 101 concerning a comparative example. FIG. 3 is a cross-sectional view of the LED lamp 1 cut along an XZ plane along a central axis O. It is a perspective view of the LED lamp 2 concerning Embodiment 2, Comprising: (a) is an external view, (b) is the figure which notched one part. It is a figure which shows a mode that LED lamp 2 is mounted | worn with the duct rail 70. FIG. It is a perspective view which shows the structure of the LED lamp 3, (a) is a general view, (b) is the elements on larger scale.

[Embodiment 1]
FIG. 1 is a partially cutaway perspective view showing a configuration of an LED lamp 1 according to an embodiment.
FIG. 2 is an exploded perspective view of the LED lamp 1.
For the sake of explanation, the direction in which light is emitted from the LED lamp 1 is assumed to be the front. In FIG. 1, the upper side (Z direction) of the drawing is the front where light is emitted.

The LED lamp 1 includes a body portion 10, a light emitting module 20 and a reflector 30 attached to the front end side of the body portion 10. The LED lamp 1 can be used by being mounted on a socket of a lighting fixture as an alternative to a halogen bulb with a reflector.
(Body part 10)
The body portion 10 includes a cylindrical case 11 whose diameter gradually increases from the rear toward the front,
The light emitting module 20 is supported at the front end of the case 11, and the reflector 30 is supported in front of the case 11. A circuit unit (not shown) for lighting the light emitting module 20 is housed inside the case 11, and a base 12 is attached to the rear end of the case 11.

The base 12 is a connection member that is inserted into a socket of the instrument body and receives electric power. The base 12 shown in FIGS. 1 and 2 is an Edison type (E type), but the type of the base is not limited to a specific base. For example, it may be a G-type base having a pair of pin-shaped terminals. Also, a base having an L-shaped terminal used for hook sealing may be used.
The case 11 has an opening 11a at the upper end, and the light emitting module 20 is fitted in the opening 11a.

The circuit unit includes a lighting circuit that lights the LED element 22 using commercial power supplied via the base 12. The lighting circuit converts, for example, an AC voltage of 100 V into DC power and supplies it to the light emitting module 20.
The case 11 may be formed of a heat conductive resin, ceramic, or the like, or may be formed of a metal (for example, aluminum). If the case 11 is formed of a heat conductive metal, heat generated in the light emitting module 20 and the circuit unit can be efficiently radiated to the outside.
(Light Emitting Module 20)
The light emitting module 20 includes a plurality of LED elements 22 arranged on the front surface of the module substrate 21.

The module substrate 21 has a disk shape slightly smaller in diameter than the opening 11a at the upper end of the case 11, and is mounted on the case 11 so as to close the opening 11a. The module substrate 21 is a wiring substrate in which a wiring layer is provided on the front side of the insulating substrate body, and the LED element 22 is mounted on the wiring layer.
As each LED element 22, an SMD (Surface Mount Device) type LED element can be used. Alternatively, the LED element may be sealed with a sealing layer using a COB (Chip on board) type LED element.

The LED element 22 includes an LED chip and a phosphor, and the type of phosphor particles is appropriately selected according to the light color classification (bulb color, warm white, white, day white, daylight color) to be realized by the LED lamp 1. Is done. Alternatively, the emission color of the LED element 22 may be red, blue, green, or a combination of the colors depending on the application of the lighting fixture used.
As an example of a preferable LED element 22, a high-intensity SMD (Surface Mount Device) type LED element that emits white light by a blue LED chip and a yellow phosphor can be cited. In this case, part of the blue light from the LED chip is converted into yellow-green light by the phosphor, the converted yellow-green light and the unconverted blue light are mixed, and white light is emitted.

In the light emitting module 20, the plurality of LED elements 22 are preferably arranged symmetrically. In the example shown in FIGS. 1 and 2, in the light emitting module 20, a total of nine LED elements 22 are arranged in a matrix of 3 rows and 3 columns.
The arrangement form of the plurality of LED elements 22 is symmetric in both the vertical direction (Y direction) and the horizontal direction (X direction), and passes through the center of the plurality of arranged LED elements 22 to a central axis O extending in the front-rear direction. It is also rotationally symmetric.

However, the number of LED elements 22, the connection method (series connection, parallel connection), and the like may be appropriately set according to the luminous flux required for the LED lamp. Further, the array form of the LED elements 22 may be a staggered pattern or a radial pattern.
When the element spacing (pitch) when arranging the plurality of LED elements 22 is narrower, better convergence can be obtained in the reflector 30, but when the spacing between the elements is narrowed, the plurality of LED elements 22 Since the LED elements 22 are densely packed, the LED elements 22 are likely to be hot during driving.

Since it is desirable to maintain the temperature of each LED element 22 at 100 ° C. or lower during driving, it is preferable to ensure a constant element spacing when arranging a plurality of LED elements 22 in consideration of this point. .
(If there is a preferred range for pitches of ~ mm or more, please add.)
(Reflector 30)
The reflector 30 is a spherical reflecting surface 31 having a smooth inner surface so that the reflected light is focused and emitted within a certain range in front.

The reflecting surface 31 has a cross section cut in a plane orthogonal to the module substrate 21 that extends over the plurality of LED elements 22 in the horizontal direction (X direction) and the vertical direction (Y direction), and has an arc shape and expands forward. Has an opening 33.
That is, the reflecting surface 31 is a cup-shaped curved surface having a large diameter from the bottom on the rear end side to the opening on the front end side.

The reflecting surface 31 has a rotationally symmetric shape with respect to the central axis 0.
As a specific example of the shape of the reflecting surface 31, the reflecting surface 31 has a parabolic shape, and the light source of the light emitting module 20 is placed near the focal point F, so that the reflected light is emitted forward as light close to parallel light. can do. Alternatively, the reflecting surface 31 may be an ellipsoidal shape, and the light source of the light emitting module 20 may be placed at a position close to one of the focal points F so that the reflected light is condensed on the other focal point.

The rear end of the reflector 30 is opened to form an opening 32, and the opening edge 32 a is set to a size that fits into the opening 11 a of the case 11.
Further, the angle (orientation angle) at which the light emitted from the LED lamp 1 spreads depends on the shape of the reflecting surface 31. The height and opening width of the reflecting surface 31 are set such that the orientation angle is about 80 ° or less, for example, about 60 °.

The reflector 30 can be produced by molding a metal plate such as aluminum. Alternatively, the resin may be molded into the shape of the reflector 30 and a metal layer such as an aluminum vapor deposition film may be formed on the inner surface thereof to form the reflecting surface 31, or a white reflecting layer containing a white pigment such as titanium oxide may be formed. The reflection surface 31 may be used.
An opening edge 32a on the rear end side of the reflector 30 is fitted into the opening 11a and is fixed with an adhesive while being sandwiched between the outer peripheral surface of the module substrate 21 and the inner peripheral surface of the case 11. Thus, the reflector 30 is fixed in front of the case 11.

A transparent front cover 35 is attached to the front end side of the reflector 30. The front cover 35 is a transparent plate that covers the opening 33 and is formed of a light-transmitting material such as a transparent acrylic resin.
Alternatively, a glass bulb in which the reflector 30 and the front cover 35 are integrated may be used. In this case, the reflective surface 31 can be formed by applying an aluminum vapor deposition film to the surface that becomes the reflective surface of the glass bulb.

(Light diffusion plate 40)
The light diffusing plate 40 is an optical component that diffuses the light emitted from each LED element 22, and the light emitting side (front side) of the plurality of LED elements 22 arranged in front of the module substrate 21 is entirely covered. Installed to cover.
As a material of the light diffusing plate 40, glass or resin (polycarbonate) excellent in light transmittance is preferable.

As the type of the light diffusion plate 40, a frost type light diffusion plate in which the surface of a transparent plate is processed into a ground glass (sand surface) shape, a corroded type in which the surface is corroded by hydrogen fluoride or the like after being formed into a ground glass shape. Examples include a light diffusing plate, an opal type light diffusing plate having a milky white film on the surface of a transparent substrate, and a lens light diffusing plate that diffuses light with a minute lens array.
Alternatively, the light diffusion plate 40 itself can be formed of a material such as a resin containing a milky white pigment.

  As a method for mounting the light diffusing plate 40 on the module substrate 21, for example, as shown in FIG. 2, the groove 23 is formed on the front surface of the module substrate 21, and the rear end portion 41 of the light diffusing plate 40 is fitted into the groove 23. And fixing with an adhesive or by providing an engaging claw at the rear end 41 of the light diffusing plate 40 and a hole for engaging it with the module substrate 21 and engaging and fixing both. The method etc. are mentioned.

In the light emitting module 20, each of the plurality of LED elements 22 is close to a point light source, but light from each of the plurality of LED elements 22 is diffused when passing through the light diffusion plate 40, and the light after transmission is pseudo. The light is emitted from the surface of the light diffusing plate 40 and irradiated like light from one light source.
The shape of the light diffusing plate 40 is such that the cross section cut across the plurality of LED elements 22 and perpendicular to the module substrate 21 in the horizontal direction (X direction) and the vertical direction (Y direction) projects forward (Z direction). It is preferable to have an arc shape. Moreover, it is more preferable to form the light diffusing plate 40 in a dome shape projecting forward (Z direction).

The light diffusing plate 40 is preferably symmetrical in both the vertical direction (Y direction) and the horizontal direction (X direction), as in the arrangement form of the plurality of LED elements 22. It is also preferable to make the center of each of them coincide with the central axis O and have a rotationally symmetrical shape with respect to the central axis O.
In this case, the diffused light is emitted as if it was emitted from the vicinity of the LED element 22b2 at the center of the region where the plurality of LED elements 22 are arranged.

However, the shape of the light diffusing plate 40 is not necessarily limited to the spherical shape, and the light diffusing plate 40 may be arranged in parallel with the module substrate 21.
(Operation of LED lamp 1)
In the LED lamp 1, power is supplied from the circuit unit to the light emitting module 20, and light is emitted from the plurality of LED elements 22.

Light emitted from the plurality of LED elements 22 in the light emitting module 20 passes through the light diffusion plate 40. Part of the light that passed through is directly emitted from the opening 33 of the reflector 30 through the front cover 35 and emitted forward, and the other part is reflected by the reflecting surface 31 of the reflector 30 and focused. In the state, the light passes through the front cover 35 and is emitted forward from the opening 33 of the reflector 30.
(Effect by providing the light diffusing plate 40)
In the LED lamp 1, since the light diffusing plate 40 which covers the some LED element 22 arranged is provided, it can suppress that a brightness nonuniformity and a shadow arise on an irradiation surface as follows.

An LED lamp 101 having the same configuration as that of the LED lamp 1 except that the light diffusion plate 40 is not provided is used as a comparative example, and the LED lamp 1 and the LED lamp 101 are compared.
Here, the description will be made assuming that the reflecting surface 31 of the reflector 30 has a parabolic shape, but the same applies to the case of an ellipsoidal shape.
FIGS. 3A and 3B are diagrams showing light rays reflected by the reflecting surface 31 in the LED lamp 1 and the LED lamp 101, and showing a section cut along an XZ plane passing through the central axis O. FIG. ing. FIG. 4 is a diagram showing a state in which spots are formed on the irradiated surface in the LED lamp 101 according to the comparative example, and (a) shows a cross section cut along an XZ plane passing through the central axis O. (B) is the figure which looked at the irradiation surface in the Z direction.

In the LED lamp 101 according to the comparative example, as shown in FIG. 3B, attention is focused on light traveling from the three LED elements 22a2 to 22c2 arranged in the horizontal direction toward the reflecting surface 31.
As shown in the enlarged view on the left in FIG. 3B, since the LED element 22a2 is located on the left side of the LED element 22b2, the incident angle of the light beam La incident on the left reflecting surface 31a is determined by the LED element. It is larger than the incident angle of the light beam Lb from 22b2. Accordingly, the reflected light beam La reflected by the left reflective surface 31a has a larger reflection angle than the reflected light beam Lb reflected at the same position, and advances to the left with respect to the reflected light beam Lb.

  On the other hand, as shown in the enlarged view on the right in FIG. 3B, the incident angle of the light beam La emitted from the LED element 22a2 and incident on the right reflecting surface 31b is the same as the LED element 22b2 incident on the same place. Is smaller than the incident angle of the light beam Lb. Accordingly, the reflected light beam La reflected by the right reflective surface 31b has a smaller reflection angle than the reflected light beam Lb reflected at the same position, and therefore proceeds to be inclined to the left of the reflected light beam Lb.

  As described above, the reflected light beam La reflected by the reflecting surfaces 31a and 31b is inclined to the left with respect to the reflected light beam Lb. Therefore, as shown in FIG. 4A, the spot Sa formed by the reflected light emitted from the LED element 22a2 and reflected by the reflecting surface 31 is emitted from the LED element 22b2 and reflected by the reflecting surface 31. It is shifted to the left from the spot Sb formed by the reflected light.

Similarly, the spot Sc formed by the reflected light that is emitted from the LED element 22c2 located on the right side of the LED element 22b2 and reflected by the reflecting surface 31 is formed from the LED element 22b2, as shown in FIG. It shifts to the right from the spot Sb formed by the reflected light that is emitted and reflected by the reflecting surface 31.
In this way, the light emitted from the plurality of LED elements 22 arranged in the lateral direction forms spots at different positions in the lateral direction on the irradiation surface. Since the same can be said for the vertical direction, the light emitted from the plurality of LED elements 22 arranged in the vertical direction also forms spots at different positions in the vertical direction on the irradiation surface.

FIG. 4B is a diagram illustrating spots formed on the irradiation surface by the light from the plurality of LED elements 22 being reflected by the reflection surface 31.
Thus, in the LED lamp 101, the light emitted from each of the plurality of LED elements 22a1, 22a2, 22a3, 22b1, 22b2, 22b3, 22c1, 22c2, 22c3 and reflected by the reflecting surface 31 is formed on the irradiation surface. The positions of the spots Sa1, Sa2, Sa3, Sb1, Sb2, Sb3, Sc1, Sc2, and Sc3 are different from each other. Therefore, uneven brightness and shadows are likely to occur on the irradiated surface.

  On the other hand, in the LED lamp 1 according to the embodiment, as described above, the light emitted from each of the plurality of LED elements 22a1 to 22c3 is diffused by the light diffusion plate 40, and from the surface of the light diffusion plate 40. Radiated to emit surface light. That is, since the whole of the plurality of LED elements 22a1 to 22c3 and the light diffusing plate 40 becomes a “single light source” in a pseudo manner, one spot is formed on the irradiated surface such that the spots Sa1 to Sc3 are mixed. Will be.

Therefore, according to the LED lamp 1, unevenness of brightness on the irradiation surface and generation of shadows are suppressed, and the convergence of the light reflected by the reflection surface 31 is improved.
In addition, it is possible to suppress luminance unevenness and shading on the irradiated surface without using the light diffusing plate 40, for example, by using a light diffusing plate in the opening 33 of the reflector 30 instead of the front cover 35. In this case, since the light passes through the light diffusion plate after being reflected by the reflector 30, the focusing property of the reflected light is likely to be impaired.

(Relationship between the size of the reflector 30 and the size of the light diffusion plate 40)
As described above, since it is desirable to ensure the element spacing when arranging the plurality of LED elements 22 in the light emitting module 20, the light diffusion plate 40 can cover the entire array of the plurality of LED elements 22 arranged. Size is required.
On the other hand, in the LED lamp 1, the smaller the size of the light diffusing plate 40, the “one light source” becomes closer to a point light source, and the light reflected by the reflecting surface 31 after being diffused by the light diffusing plate 40 is focused. Property is improved.

Therefore, the size of the light diffusing plate 40 is required to be at least the size covering the entire plurality of LED elements 22, but is preferably set as small as possible.
FIG. 5 is a cross-sectional view of the LED lamp 1 cut along the center axis O along the XZ plane.
From the above viewpoint, the ratio of the lateral width a (X direction width) of the light diffusing plate 40 to the lateral width b (X direction width) of the opening 33 at the front end of the reflector 30 is 0.7 or less (a / b ≦ 0.7) is preferable. Further, the ratio between the vertical width (Y-direction width) of the light diffusing plate 40 and the vertical width of the opening 33 at the front end of the reflector 30 is also similar to this, and is preferably set to 0.7 or less. .

The ratio of the height c (distance in the Z direction) of the light diffusing plate 40 from the LED element 22 to the height d (distance in the Z direction) from the module substrate 21 to the opening 33 of the reflector 30 is 0. It is preferable to set it to 6 or less (c / d ≦ 0.6). Furthermore, it is more preferable to set in the ranges of a / b ≦ 0.35 and c / d ≦ 0.3.
[Embodiment 2]
6A and 6B are perspective views of the LED lamp 2 according to the second embodiment, in which FIG. 6A is an external view, and FIG. 6B is a partially cutaway view.

The LED lamp 2 includes a body part 60, a light emitting module 62 attached to the front end side of the body part 60, a horn-shaped reflector 63, and the like.
The body portion 60 is configured by housing a circuit unit 64 for lighting the light emitting module 62 in a cylindrical case 61, and a power plug 65 for connecting to the duct rail is attached to the rear end of the case 61. ing.

A transparent front cover 66 is attached to the front end side of the reflecting plate 63.
As shown in FIG. 7, the LED lamp 2 is mounted on the duct rail 70 by locking the power plug 65 to the duct rail 70 and can be lit.
Also in the LED lamp 2, as in the LED lamp 1 of the first embodiment, the light emitting module 62 is configured by arranging a plurality of LED elements 68 that emit white light on the front surface of the module substrate 67. The plurality of LED elements 68 arranged on the module substrate 67 are entirely covered with a dome-shaped light diffusion plate 69. The light emitted from the plurality of LED elements 68 in the light emitting module 62 passes through the light diffusion plate 69 and is diffused. A part of the diffused light directly passes through the front cover 66 and is emitted forward, and the remaining part is reflected and focused by the reflector 63 and is emitted through the front cover 66. .

Also in this LED lamp 2, since the light from the plurality of LED elements 68 is diffused by the light diffusing plate 69 as in the LED lamp 1 of the first embodiment, the plurality of LED elements 68 and the light diffusing plate 69 are It looks like one light source. Accordingly, it is possible to reduce unevenness in luminance on the irradiated surface while maintaining the light convergence by the reflector 63.
[Embodiment 3]
8A and 8B are perspective views showing the configuration of the LED lamp 3, wherein FIG. 8A is an overall view and FIG. 8B is a partially enlarged view.

  This LED lamp 3 is a straight tube type LED lamp, which is made of a light-transmitting material such as glass and extends in the longitudinal direction (Y direction), and both ends in the longitudinal direction (Y direction) of the outer tube 71. And a light emitting module 73, a reflecting plate 74, and a light diffusing plate 75 housed in the outer tube 71. In the outer tube 71, a circuit unit (not shown) is housed on the back surface of the light emitting module 73, and a lead wire (not shown) is connected to the circuit unit from the base 72.

The LED lamp 3 is supplied with power to the circuit unit when each base 72 is inserted into the socket of the lighting fixture, and is supplied with power to the light emitting module 73 from the circuit unit to emit light, and emits light forward (in the direction of arrow Z). .
The light emitting module 73 includes a plurality of LED elements 732 arranged in a plurality of rows (three rows) on the front surface (surface on the arrow Z direction side) of a long module substrate 731 extending in the vertical direction (Y direction). The substrates 731 are arranged along the longitudinal direction (Y direction).

The reflection plate 74 extends in the vertical direction (Y direction) along the module substrate 731, and the XZ cross section is an arc shape, and the interval between the reflection surfaces is widened in the front (arrow Z direction). . The reflection plate 74 has a function of focusing and reflecting the light from the light emitting module 73 mainly in the lateral direction.
Further, the shape of the XZ cross section of the reflector 74 influences the orientation angle in the XZ plane of the LED lamp 3, but is set so that the orientation angle in the XZ plane is about 60 °, for example. .

When the LED lamp 3 is a wide orientation angle type, the XZ sectional shape of the reflection plate 74 is set so that the orientation angle is about 120 °.
The light diffusing plate 75 entirely covers the plurality of LED elements 732 arranged on the module substrate 731. The light diffusion plate 75 extends in the vertical direction (Y direction) along the module substrate 731, has an arcuate XZ cross section, and has a vertically long dome shape.

In such an LED lamp 3, a plurality of (three) LED elements 732 are arranged in the lateral direction in the XZ plane. Light emitted from each LED element 732 is diffused by the light diffusion plate 75. After that, the light is reflected directly or reflected by the reflecting plate 74 and emitted forward.
Therefore, as described in the first embodiment, the light diffused by the light diffusing plate 75 becomes pseudo like a light emitted from “one light source” in the XZ plane. While maintaining the convergence of light by the plate 74, uneven brightness can be reduced.

  Also in the LED lamp 3, as described in the first embodiment, the light emitted from the light diffusion plate 75 becomes closer to the light emitted from the point light source as the width and height of the light diffusion plate 75 are smaller. Convergence is improved. Therefore, the ratio between the lateral width (X direction width) of the light diffusing plate 75 and the lateral width (X direction width) of the front end opening of the reflecting plate 74 is preferably set to 0.7 or less. The ratio of the height of the light diffusing plate 75 from the LED element 732 (length in the Z direction) to the height from the module substrate 731 to the opening of the reflecting plate 74 (length in the Z direction) is 0.6 or less. It is preferable to set to.

In the LED lamp 3, the light emitting module 73, the reflecting plate 74, and the light diffusing plate 75 are housed in the outer tube 71, but the light emitting module and the reflecting plate are placed in an aluminum case or the like instead of the outer tube. A long LED lamp can also be configured by accommodating a light diffusion plate.
[Modifications of Embodiments 1 to 3]
In the LED lamps 1 to 3, a plurality of independent LED elements are arranged on the substrate. However, when the plurality of LED elements form one chip body, that is, a plurality of N electrodes (non-light-emitting elements). In the chip body that emits light from a plurality of locations, a plurality of LED elements are arranged by providing only one chip body in the light emitting module 20, and therefore the one chip body What is necessary is just to provide the light-diffusion plate 40 so that it may cover.

In the LED lamps 1 and 2, the reflecting surface is a curved surface, but may be formed of a plurality of flat portions as long as the reflecting surface has a function of focusing light.
In the LED lamps 1 to 3, the light is diffused by the light diffusing plate and then converged by being reflected by the reflecting plate. However, a condensing lens is further installed in the front end opening of the reflecting plate, and the condensing lens. May focus the light. Also in this case, since the light emitted from the plurality of LEDs is diffused by the light diffusion plate and then passes through the condenser lens, it is effective in preventing luminance unevenness and color unevenness.

Although the lighting circuit is incorporated in the LED lamps 1 to 3 according to the above-described embodiment, the lighting circuit may be provided in an appliance to which the LED lamp is mounted without providing the lighting circuit in the LED lamp.
In the LED lamps 1 to 3, a light guide plate or the like may be interposed between the light diffusing plate and the reflecting plate, and in this case, the same effect is obtained.

  In the LED lamps 1 to 3, a plurality of LED elements are arranged in the light emitting module. However, in addition to the LED elements, a reflection type lamp in which a plurality of semiconductor light emitting elements such as an organic EL element and a semiconductor laser element are arranged is also applicable. The present invention can be implemented in the same manner, and an effect of suppressing luminance unevenness can be obtained by providing a light diffusion plate so as to cover a plurality of arranged semiconductor light emitting elements.

1 to 3 LED lamps 20 light emitting module 21 module substrate 22 LED element 30 reflector 31 reflecting surface 33 opening 35 front cover 40 light diffusion plate 62 light emitting module 63 reflection plate 64 circuit unit 67 module substrate 68 LED element 69 light diffusion plate 71 Outer tube 72 Base 73 Light emitting module 74 Reflector 75 Light diffuser 731 Module substrate 732 LED element

Claims (7)

A light emitting module in which a plurality of semiconductor light emitting elements are arranged on a substrate;
A light diffusing plate that covers the entire light emitting side of the arrayed semiconductor light emitting elements; and
And a reflecting member having a reflecting surface for reflecting the light emitted from the light emitting module and passing through the light diffusing plate to focus the reflected light. The light diffusion plate is
2. The lamp according to claim 1, wherein a cross section of the plurality of semiconductor light emitting elements that is cut across a plane orthogonal to the substrate extends over two or more of the plurality of semiconductor light emitting elements has an arc shape extending in a light emitting direction. The reflective surface is
A cross section cut at a plane orthogonal to the substrate across two or more of the plurality of semiconductor light emitting elements,
3. The lamp according to claim 1, wherein the lamp has an arc shape extending in a light emitting direction. The reflective surface is a curved surface curved in a cup shape,
The lamp according to any one of claims 1 to 3, wherein the light diffusing plate has a dome shape projecting from the bottom side of the reflecting surface in the light emitting direction. The width of the light diffusing plate in the direction along the substrate is:
The lamp according to any one of claims 1 to 4, wherein the width is 0.7 or less with respect to the width in the same direction of the light emitting side opening on the reflecting surface. The distance from the semiconductor light emitting element to the light diffusion plate with respect to the light emitting direction is
The lamp according to claim 1, wherein the distance is 0.6 or less with respect to the distance from the substrate to the light emitting side opening of the reflecting surface. The light emitting module and the reflective member are
It is fixed to one end side of the body part that supports the light emitting module and the reflecting member,
The lamp according to any one of claims 1 to 6, wherein a connection member that receives electric power for lighting the light emitting module from the outside is attached to the other end side of the body portion.

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