JP4134640B2 - Lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a lamp that uses a light source that emits light in at least a two-dimensional direction, is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an ellipse other than a circle. .
[0002]
  In the present specification, the LED chip itself is referred to as a “light emitting element”, and the whole including the optical device such as a package resin or a lens system on which the LED chip is mounted is referred to as a “light emitting diode” or “LED”. To do.
[0003]
[Prior art]
  A conventional Fresnel lens combined lamp will be described with reference to FIG. FIG. 12 is a cross-sectional view showing the structure of a conventional lamp using a Fresnel lens.
[0004]
The lamp 70 includes a convex lens-shaped LED 71 and a Fresnel lens 72. The light emitted from the LED 71 is collected to some extent by the convex lens-shaped radiation surface, reaches the Fresnel lens 72, is distributed by the Fresnel lens 72, and is emitted forward as parallel light.
[0005]
  However, due to restrictions on the distance between the Fresnel lens 72 and the light source, the lamp 70 becomes thick as shown in the drawing, and light that cannot be controlled in the lateral direction is emitted, so that the light utilization efficiency is low. Furthermore, since the light radiated from the LED 71 in the direction of 45 degrees obliquely and reaches the Fresnel lens 72 must pass through a distance √2 times that of the light radiated vertically and reach, the light intensity is 1 / 2 and the outer peripheral part becomes darker than the central part.
[0006]
  In order to solve such a problem, an invention described in JP-A-2001-76513 has been made. As shown in FIG. 13, in the vehicular lamp 74 described in this publication, a parabolic reflecting surface 78 is provided in a portion of the front lens 77 facing the LED 75 to reflect light emitted from the LED 75 in the lateral direction. The front lens 77 is provided with a second reflecting surface 79 that reflects this light further forward. As a result, a thin lamp can be obtained.
[0007]
[Problems to be solved by the invention]
  However, even in the vehicular lamp described in this publication, the problem of low light utilization efficiency is not solved because light that cannot be controlled in the lateral direction, that is, in a two-dimensional direction, has not been solved. In this case, the problem that the luminance is unbalanced because the distance from the LED is different between the central part and the peripheral part has not been solved, and there is a problem that the number of parts is large and adjustment is difficult.
[0008]
  Accordingly, an object of the present invention is to provide a lamp that is thin, highly efficient, has a high degree of freedom in appearance, and has a natural image in which the brightness of the entire lamp is uniform and sparkles.
[0009]
[Means for Solving the Problems]
  The lamp according to the invention of claim 1 is a radiation source that emits light in at least a two-dimensional direction;It is made of a transparent body, is disposed around the entire circumference of the radiation source, and reflects light emitted from the radiation source in a two-dimensional direction and transmitted through the transparent body by total reflection.A reflecting surface that radiates light from the light emitting element in a two-dimensional direction.OrThe reflector has a plurality of segments, and the plurality of segments of the reflector are segments having different light collection degrees having a light collection degree corresponding to an irradiation density from the radiation light source, and the segments control the luminance by providing curvature. A plurality of segments having different distances from the radiation source, and the segments having different distances are arranged such that an inner segment and an outer segment are separated from each other,In addition, adjacent reflector segments have different distances from the center and adjacent segments are staggered.Is.
[0010]
  As described above, the configuration of the radiation light source and the reflector provided around the radiation light source makes it possible to make the thickness extremely thin and increase the radiation surface. In addition, since the reflector is composed of a plurality of segments with different light collection degrees, by adjusting the light collection degree according to the distance from the light source,In other words, the brightness of the entire reflector can be balanced and uniform by setting the light intensity of the near part where the irradiation density from the radiation source is high to be low and the light intensity of the far part where the irradiation density is low is set to be high. It can be used as a light fixture.
[0011]
in this way,It is also possible to make a lamp with a glittering feeling that the entire surface shines uniformly. For example, the central portion can be darkened and the peripheral portion can be brightly lit, thereby increasing the degree of freedom of appearance. Furthermore, even in a lamp with a shape in which the distance between the reflector segment, such as an elliptical shape, and the light source varies depending on the location, the segment far from the light source increases the light collection degree, and the segment close to the light source reduces the light collection degree. Can be illuminated uniformly.
[0012]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
[0013]
  Here, the radiation light source that emits light in at least a two-dimensional direction does not mean only a light source that emits light in only a two-dimensional direction. Since there is no difference in radiating light in a dimensional direction, it is specified as radiating light in at least a two-dimensional direction.
[0014]
In addition, the segments having different condensing degrees can correspond to changing the cross-sectional shape including the reflecting surface cut in the radial direction, changing the refractive index, and the like.
And, by setting the light intensity of the near part where the irradiation density from the radiation source is high to be low, and setting the light intensity of the far part where the irradiation density is low to be high, the brightness of the entire reflector is balanced and uniform. It can be used as a light fixture.
Furthermore, since the segments of the adjacent reflectors have different distances from the center, and the adjacent segments are arranged alternately, the bright spots of the lamp can be more dispersed. And if the curvature is given according to the irradiation density of each segment, the brightness | luminance of the whole lamp | ramp can be made uniform.
[0015]
  Claim2The lamp according to the invention of claim1In the configuration, the reflector segment has a longest distance from the radiation source that is at least twice the shortest.
[0016]
  As a result, the brightness of the radiated light is inversely proportional to the square of the distance. Therefore, it is possible to increase the concentration of the segment with the longest distance from the light source to make the brightness of the entire lamp uniform. The brightness can also be changed by. In this way, by adjusting the light collection degree of the segments having different distances from the light source, it is possible to variously adjust the appearance of the lamp.
[0017]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
[0018]
  According to a third aspect of the present invention, there is provided the lamp according to the second aspect, wherein the radiation light source has a flat surface at a central portion facing the upper surface of the light emitting element, and the light emitting element emits light as a reflective surface following the central portion. The optical surface formed by rotating a part of a parabola around the Z axis with the center of the surface as the focal point and the X axis direction as the symmetry axis, and the side surface of the radiation light source are spherical surfaces centering on the light emitting element. The flat surface, the optical surface, and the side surface are formed of a transparent optical material that seals the light emitting element.
[0019]
  Accordingly, since the position and shape of the optical surface as a reflecting mirror that reflects light in a two-dimensional direction can be set strictly at the time of sealing, the position of the optical system can be easily set. In this way, it takes no effort to align the light emitting element and the reflecting mirror for radiating in the two-dimensional direction, and high positional accuracy can be easily realized.
[0020]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
DETAILED DESCRIPTION OF THE INVENTION
[0021]
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
Embodiment 1
  First, Embodiment 1 of the lamp of the present invention will be described with reference to FIGS. 1 to 5. Fig.1 (a) is a top view which shows the whole structure of the lamp concerning Embodiment 1 of this invention, (b) is sectional drawing. FIG. 2 is a sectional view showing an LED as a radiation light source of the lamp according to the first embodiment of the present invention. Fig.3 (a) is sectional drawing which shows the AA cross section of the segment of the lamp concerning Embodiment 1 of this invention, (b) is sectional drawing which shows a BB cross section. Fig.4 (a) is sectional drawing which shows the AA cross section of the segment of the lamp | ramp concerning the modification of Embodiment 1 of this invention, (b) is sectional drawing which shows a BB cross section. Fig.5 (a) is sectional drawing which shows the AA cross section of the segment of the lamp | ramp concerning another modification of Embodiment 1 of this invention, (b) is sectional drawing which shows a BB cross section.
[0023]
  As shown in FIG. 1, the lamp 1 according to the first embodiment has an LED 3 as a radiation light source having a light emitting element 2 built in at the center, and aluminum is vapor-deposited on a synthetic resin installed around the LED 3. The shaded portion of the surface of the reflector body 4 is the reflectors 4a and 4b composed of a plurality of segments 5a and 5b. As shown in the cross-sectional view of FIG. 1B, the segments 5a and 5b of the reflectors 4a and 4b are inclined at approximately 45 degrees and reflected in a two-dimensional direction facing the light emitting surface of the light emitting element 2 of the LED 3. The light reflected in the two-dimensional direction from the optical surface 9b to be reflected is reflected upward (Z-axis direction).
[0024]
  Here, the two-dimensional direction means a direction toward the surface formed by the reflectors 4a and 4b composed of the segments 5a and 5b installed around the LED 3 with respect to the LED 3. Strictly, it is not limited to the planar direction perpendicular to the Z axis from the LED 3, as long as the light from the LED 3 is efficiently irradiated onto the reflector surface installed around the LED 3.
[0025]
  Since the inner reflector 4a is close to the LED 3, the segments 5a of the inner reflector 4a are all flat, and the eight segments 5a form a regular octagon. On the other hand, the segment 5b of the outer reflector 4b has a slightly concave curved surface on the AA cross section as shown in FIG.
[0026]
  Next, the configuration of the LED 3 will be described with reference to FIG. Here, as shown in FIG. 2, the center axis of the light emitting element 2 is the Z axis, the upper surface of the light emitting element 2 is the origin, and the X axis and the Y axis intersect at a right angle at this origin.
[0027]
  As shown in FIG. 2, the light emitting element 2 is mounted on the tip of the lead 6a among the pair of leads 6a and 6b provided on the XY plane. The electrode on the upper surface of the light emitting element 2 and the tip of the lead 6b are bonded by a wire 7 to be electrically connected. The tips of the leads 6a and 6b, the light emitting element 2, and the wire 7 are set in a resin sealing mold and sealed with a transparent epoxy resin 8 in a cross-sectional shape as shown in the figure. Here, a fine flat surface is formed at the center of the upper surface 9 of the LED 3. Following this center point 9a, a part of a parabola with the center of the light emitting surface of the light emitting element 6 as the reflecting surface 9b as a focal point and a symmetry axis in the X axis direction is within a range of 60 degrees or more with respect to the Z axis from the origin. It is shaped like an umbrella rotated around the Z axis. Further, the side surface 10 of the LED 3 forms a part of a spherical surface centered on the light emitting element 2.
[0028]
  That is, the LED 3 as the radiation light source of the first embodiment has an optical surface 9 b that reflects in a two-dimensional direction facing the light emitting surface of the light emitting element 2.
[0029]
  A method of lighting the lamp 1 having such a configuration will be described with reference to FIGS. 1 to 3.
[0030]
When a voltage is applied to the leads 6a and 6b of the LED 3 to cause the light emitting element 2 to emit light, light within the range of 60 degrees or more with respect to the Z axis, corresponding to most of the light emitted from the light emitting element 2, is emitted. The light reaches the upper surface 9b as a reflecting surface, and all of the light is totally reflected and directed toward the side surface 10 because the incident angle on the upper surface 9b is larger than the critical angle. Here, since the upper surface 9b has a shape in which a part of a parabola with the light emitting element 2 as a focal point and an X axis as a symmetry axis is rotated around the Z axis, all the light reflected by the upper surface 9b is X−. Proceeding in parallel to the Y plane, the side surface 10 forms a part of a spherical surface centering on the light emitting element 2, so that the light travels almost in parallel and is radiated in a planar shape around 360 degrees around the Z axis. Further, the light directed directly from the light emitting element 2 to the side surface 10 is emitted in the same direction without being refracted because the side surface 10 forms a part of a spherical surface centering on the light emitting element 2. Note that a small amount of light emitted in the Z-axis direction is radiated to the outside from a minute flat surface formed in the central portion.
[0031]
  Around the LED 3, there is a reflector 4a having an inclination of about 45 degrees, but light directly radiated from the side surface 10 including X light reflected by the upper surface 9b and traveling substantially parallel to the XY plane is also X Since the light is almost parallel to the -Y plane, the light reflected by the reflector 4a travels almost vertically upward and is emitted outside at least within a range of 20 degrees from the Z axis. Note that the light expressed as “parallel” in the above is not completely parallel because of the size of the light emitting element 2, but any light is almost parallel and is at least 20 degrees from the Z axis. It will surely be inside.
[0032]
  On the other hand, the light emitted from the LED 3 in the two-dimensional direction is also reflected by the reflector 4b on the outer periphery of the reflector 4a. However, as described above, the light is collected because the reflector 4b has a concave curved surface in the longitudinal direction. The brightness is increased and reflected upward. As a result, the light intensity attenuates in inverse proportion to the square of the distance from the light source. However, the reflected light of the reflector 4a, which is close to the light source LED3 and has a small attenuation rate, is collected by the planar reflector 4a. Without being reflected. On the other hand, the reflected light of the reflector 4b, which is far from the light source LED3 and has a large attenuation rate, is condensed by the concave curved reflector 4b and reflected upward. In addition, the light radiated outside in the Z-axis direction from the minute flat surface formed in the central portion of the LED 3 does not reach the reflector 4 installed around the LED 3 and is directly radiated to the outside.
[0033]
  The light emitting element is an LED and does not reach a high temperature because it directly converts electrical energy into light energy. In addition, since the light emitting element size is very small, the optical control efficiency can be increased. Furthermore, since the LED itself has a reflecting mirror for emitting light from the light emitting element in a two-dimensional direction, and the reflecting mirror seals the light emitting element with a transparent epoxy resin and is molded. The number of parts does not increase as in the example, and the positioning of the light emitting element and the reflecting mirror for radiating in the two-dimensional direction is not troublesome, and high positional accuracy can be easily realized.
[0034]
  As a result, when viewed from above (distant in the Z-axis direction), the natural brightness of the entire lamp 1 is uniform and shining due to the direct light from the LED 3 and the radiated light from each reflector segment that has been condensed and adjusted. It can be done with a light fixture with an image. Furthermore, the lamp 1 is a very good-looking lamp in which external light is reflected even when the lamp is turned off, and the whole is uniformly shining.
[0035]
  Next, a modified example of the lamp 1 according to the first embodiment will be described with reference to FIGS. In the modified example of FIG. 4, the surface of the fragment 5b of the reflector 4b has no curvature in the AA direction and has a concave curvature in the BB direction. Moreover, the modification of FIG. 5 has a concave curvature in both directions, and any of them is a case where the outer reflector 4b needs more light concentration as a lamp.
[0036]
  Furthermore, as another modification, the inner segment 5a may be a convex surface, and the outer segment 5b may be a flat surface to diffuse the reflected light on the inner side to make the entire luminance uniform. In this case, it is suitable when a wider light distribution than the lamp 1 of the first embodiment is required, or when the solid angle of the reflector segment with respect to the light source is small. Further, the reflector has three or more annular shapes, and the curvature is changed according to the irradiation density from the light source to each segment to form a condensing reflection surface or a diffuse reflection surface, and the outer reflector segment with respect to the inner reflector Various modifications such as those with a large number of divisions are conceivable. For example, the brightness of the outer reflector 4b may be higher than that of the reflector 4a close to the LED 3.
[0037]
  In this way, the lamp has a natural image that is thin, highly efficient, has a high degree of freedom in appearance, and has a uniform overall brightness and sparkles.
[0038]
Embodiment 2
  Next, a second embodiment of the lamp of the present invention will be described with reference to FIG. FIG. 6 is a plan view showing the overall configuration of the lamp according to the second embodiment of the present invention.
[0039]
  As shown in FIG. 6, in the lamp 11 according to the second embodiment, the distance from the center of the segment of the adjacent reflector is different. That is, the LED 3 as the radiation source similar to that of the first embodiment is surrounded, separated from the LED 3 by one step from the segment 15a at the nearest position, then alternately at the segment 15b, further alternately at the segment 15c, and the segment 15d. Go. By arranging the reflector segments 15a, 15b, 15c, and 15d in this manner, the bright spots of the lamp 11 can be more dispersed. And the brightness | luminance of the whole lamp | ramp 11 can be made uniform by giving each segment 15a, 15b, 15c, 15d the curvature according to the irradiation density from LED3.
[0040]
  Note that adjacent segments need not be completely staggered in this way, and may be shifted to some extent (for example, about half the width of the segment). Even in this case, the bright spots of the lamp 11 can be dispersed to some extent.
[0041]
Embodiment 3
  Next, a third embodiment of the lamp of the present invention will be described with reference to FIG. FIG. 7: is a top view which shows the whole structure of the lamp concerning Embodiment 3 of this invention.
[0042]
  As shown in FIG. 7, in the lamp 21 according to the third embodiment, a substantially elliptical radiation surface is formed by the reflector segments 22 arranged in two stages. An LED 3 as a radiation source similar to that of the first embodiment is placed in the center, and segments 22 are arranged in the periphery of the LED 3 to form an elliptical shape. And the brightness | luminance of the whole lamp 21 can be made uniform by giving each segment 22 a curvature according to the irradiation density from LED3.
[0043]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
[0044]
Embodiment 4
  Next, a fourth embodiment of the lamp of the present invention will be described with reference to FIG. FIG. 8: is a top view which shows the whole structure of the lamp concerning Embodiment 4 of this invention.
[0045]
  As shown in FIG. 8, in the lamp 31 according to the fourth embodiment, the segment 32 forms an elliptical shape, but the position of the LED 3 as the radiation light source is greatly deviated from the center. As a result, the position and shape of each segment vary, but the brightness of the entire lamp 31 can be made uniform by providing a curvature according to the irradiation density from the LED 3. In addition, if uniform radiation is made in the two-dimensional direction from the light source, the irradiation density to each segment is inversely proportional to the square of the distance from the light source of each segment. Although the same applies to the above-described embodiment, in the fourth embodiment, the ratio of the distance between the segment close to the light source and the segment away from the light source is large, resulting in a large difference in irradiation density. However, it is possible to make the brightness uniform by making the segment close to the light source convex, and gradually reducing the curvature as the distance increases and making the segment farthest flat.
[0046]
  In each of the above embodiments, the case has been described in which the brightness of the entire lamp is made uniform by giving a curvature to the segment. However, the brightness of the lamp can be changed depending on the location as well. In short, the fact that the brightness of the lamp can be controlled by giving the segment a curvature is important.
[0047]
Embodiment 5
  Next, a fifth embodiment of the lamp of the present invention will be described with reference to FIG. FIG. 9: is a longitudinal cross-sectional view which shows the whole structure of the lamp concerning Embodiment 5 of this invention.
[0048]
  As shown in FIG. 9, in the lamp 41 of the fifth embodiment, the central LED 43 is surrounded by a disk-shaped transparent body 44. The LED 43 is different from the LED 3 in each of the above embodiments in that the light emitting element 42 is mounted on the upper surface of the lead 46a out of a pair of leads 46a and 46b provided in the vertical direction, and the light emitting element 42 and the other lead 46b Is electrically connected with a wire and is resin-sealed in the same shape as the LED 3. In each of the above embodiments, the LED 43 can be used instead of the LED 3.
[0049]
  A reflector 45 is provided on the lower surface of the transparent body 44 in three stages. These reflectors 45 reflect light emitted from the LEDs 43 in a two-dimensional direction and transmitted through the transparent body 44 upward by total reflection. Each stage is divided into eight segments. The near-segment with a high irradiation density from the radiation light source 43 is set to a lower concentration, and the far-segment with a low irradiation density is set to a higher concentration. Thus, the brightness of the entire reflector can be balanced and a lamp with a uniform way of lighting can be obtained.
[0050]
Embodiment 6
  Next, a sixth embodiment of the lamp of the present invention will be described with reference to FIG. FIG. 10A is a plan view showing the overall configuration of the radiation source used in the lamp according to the sixth embodiment of the present invention, FIG. 10B is a plan view showing the configuration of the lens type LED constituting the radiation source, and FIG. ) Is a side view, and (d) is a front view.
[0051]
  As shown in FIG. 10A, in the lamp of the sixth embodiment, instead of the integrated LEDs 3 and 43 as the radiation light source, eight lens LEDs 63 are used and the radiation surface is directed in the two-dimensional direction. A radiation light source 62 arranged in an octagon is used. As shown in FIGS. 10B, 10C, and 10D, in the lens-type LED 63, the sealing resin lens 64 is wide in the β direction and narrow in the γ direction perpendicular thereto. In the radiation source 62, eight lens-type LEDs 63 are arranged so that the α-β planes are arranged in a two-dimensional direction.
[0052]
  Since the lens-type LED 63 emits radiated light that is slightly expanded in the β direction and radiated light that is substantially parallel to the α direction, the radiant light source 62 emits light in the two-dimensional direction without a 360 ° gap. When the difference in distance to each reflector segment arranged around the radiation light source 62 is large, the same effect as in each of the above embodiments can be obtained.
[0053]
Embodiment 7
  Next, a seventh embodiment of the lamp of the present invention will be described with reference to FIG. FIG. 11A is a plan view showing the overall configuration of a radiation light source used in a lamp according to a seventh embodiment of the present invention, FIG. 11B is a plan view showing the configuration of a reflective LED constituting the radiation light source, and FIG. ) Is a longitudinal sectional view.
[0054]
  As shown in FIG. 11A, in the lamp of the seventh embodiment, instead of the integrated LEDs 3 and 43 as the radiation light source, eight reflective LEDs 53 are used and the radiation surface is directed in the two-dimensional direction. A radiation light source 52 arranged in an octagon is used. As shown in FIGS. 11B and 11C, in the reflective LED 53, the light emitting element 42 is mounted on the back side of the tip of the lead 54a of the pair of leads 54a and 54b, and the upper surface terminal of the light emitting element and the lead 54b are mounted. Are connected to each other with a wire, and a rotary paraboloid reflecting mirror 55 is installed at a position facing the light emitting surface of the light emitting element 42, and the whole is sealed with a transparent epoxy resin 56. As a result, the light emitted from the light emitting element 42 is reflected by the rotary paraboloid-shaped reflecting mirror 55 in parallel to the substantially vertical axis direction, and is emitted from the radiation surface 57 to the outside. Therefore, when the reflective structure is used, the light emitted from the light emitting element can be more efficiently radiated in the two-dimensional direction.
[0055]
  Here, when the light of the light emitting element 42 is accurately reflected by the reflecting mirror 55 in parallel with the vertical axis direction, a portion where the light is not emitted is generated between the adjacent reflective LEDs 53 of the radiation light source 52. Actually, light emitted externally in an oblique direction is also generated due to the size of the light emitting element 42, etc., so that the radiation light source 52 emits light in a two-dimensional direction without a gap of 360 degrees.
[0056]
  When the difference in distance to each reflector segment arranged around the radiation light source 52 is large, the same effects as those in the above embodiments can be obtained.
[0057]
  Although not as thin and small as in the above-described embodiment, such a light source may be used.
[0058]
  In each of the above embodiments, it is assumed that a red light emitting element is used as the light emitting element, but any color light emitting element may be used. Further, although a transparent epoxy resin is used as a light transmissive material for sealing a light emitting element or the like in an LED, other materials such as a transparent silicon resin may be used.
[0059]
  The configuration, shape, quantity, material, size, connection relationship, and the like of the other parts of the lamp are not limited to the above embodiments.
【The invention's effect】
[0060]
  As described above, the lamp according to the invention of claim 1 includes a radiation source that emits light in at least a two-dimensional direction,Arranged all around the radiation sourceAnd a reflecting surface for emitting light from the light emitting element in a two-dimensional direction.OrThe reflector has a plurality of segments, and the plurality of segments of the reflector are segments having different light collection degrees having a light collection degree corresponding to an irradiation density from the radiation light source, and the segments control the luminance by providing curvature. In addition, a plurality of segments having different distances from the radiation source are provided, and the segments having different distances are arranged such that an inner segment and an outer segment are separated from each other.
[0061]
  As described above, the configuration of the radiation light source and the reflector provided around the radiation light source makes it possible to make the thickness extremely thin and increase the radiation surface. In addition, since the reflector is composed of a plurality of segments with different light collection degrees, by adjusting the light collection degree according to the distance from the light source,In other words, the brightness of the entire reflector can be balanced and uniform by setting the light intensity of the near part where the irradiation density from the radiation source is high to be low and the light intensity of the far part where the irradiation density is low is set to be high. It can be used as a light fixture.
[0062]
in this way,It is also possible to make a lamp with a glittering feeling that the entire surface shines uniformly. For example, the central portion can be darkened and the peripheral portion can be brightly lit, thereby increasing the degree of freedom of appearance. Furthermore, even in a lamp with a shape in which the distance between the reflector segment, such as an elliptical shape, and the light source varies depending on the location, the segment far from the light source increases the light collection degree, and the segment close to the light source reduces the light collection degree. Can be illuminated uniformly.
[0063]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
[0064]
  Here, the radiation light source that emits light in at least a two-dimensional direction does not mean only a light source that emits light in only a two-dimensional direction. Since there is no difference in radiating light in a dimensional direction, it is specified as radiating light in at least a two-dimensional direction.
[0065]
In addition, the segments having different condensing degrees can correspond to changing the cross-sectional shape including the reflecting surface cut in the radial direction, changing the refractive index, and the like.
[0066]
  Claim2The lamp according to the invention of claim1In the configuration, the reflector segment has a longest distance from the radiation source that is at least twice the shortest.
[0067]
  As a result, the brightness of the radiated light is inversely proportional to the square of the distance. Therefore, it is possible to increase the concentration of the segment with the longest distance from the light source to make the brightness of the entire lamp uniform. The brightness can also be changed by. In this way, by adjusting the light collection degree of the segments having different distances from the light source, it is possible to variously adjust the appearance of the lamp.
[0068]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
[0069]
  According to a third aspect of the present invention, there is provided the lamp according to the second aspect, wherein the radiation light source has a flat surface at a central portion facing the upper surface of the light emitting element, and the light emitting element emits light as a reflective surface following the central portion. The optical surface formed by rotating a part of a parabola around the Z axis with the center of the surface as the focal point and the X axis direction as the symmetry axis, and the side surface of the radiation light source are spherical surfaces centering on the light emitting element. The flat surface, the optical surface, and the side surface are formed of a transparent optical material that seals the light emitting element.
[0070]
  Accordingly, since the position and shape of the optical surface as a reflecting mirror that reflects light in a two-dimensional direction can be set strictly at the time of sealing, the position of the optical system can be easily set. In this way, it takes no effort to align the light emitting element and the reflecting mirror for radiating in the two-dimensional direction, and high positional accuracy can be easily realized.
[0071]
  In this way, the lamp is thin, highly efficient, has a high degree of freedom in appearance, and can cope with an irregular shape such as an elliptical shape without lowering the efficiency.
[Brief description of the drawings]
FIG. 1A is a plan view showing the overall configuration of a lamp according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view.
FIG. 2 is a cross-sectional view showing an LED as a radiation light source of the lamp according to the first embodiment of the present invention.
FIG. 3 (a) is a cross-sectional view showing the AA cross section of the segment of the lamp according to the first embodiment of the present invention, and FIG. 3 (b) is a cross sectional view showing the BB cross section.
FIG. 4A is a cross-sectional view showing the AA cross section of the segment of the lamp according to the modification of the first embodiment of the present invention, and FIG. 4B is a cross-sectional view showing the BB cross section.
FIG. 5 (a) is a cross-sectional view showing an AA section of a segment of a lamp according to another modification of the first embodiment of the present invention, and (b) is a cross-sectional view showing a BB section. is there.
FIG. 6 is a plan view showing an overall configuration of a lamp according to a second embodiment of the present invention.
FIG. 7 is a plan view showing an overall configuration of a lamp according to a third embodiment of the present invention.
FIG. 8 is a plan view showing an overall configuration of a lamp according to a fourth embodiment of the present invention.
FIG. 9 is a longitudinal sectional view showing an overall configuration of a lamp according to a fifth embodiment of the present invention.
FIG. 10 (a) is a plan view showing the overall configuration of a radiation light source used in a lamp according to a sixth embodiment of the present invention, and FIG. 10 (b) is a plan view showing the configuration of a lens-type LED that constitutes the radiation light source. (C) is a side view, (d) is a front view.
FIG. 11A is a plan view showing the overall configuration of a radiation source used in a lamp according to a seventh embodiment of the present invention, and FIG. 11B is a plan view showing the configuration of a reflective LED that constitutes the radiation source. FIG. 2C is a longitudinal sectional view.
FIG. 12 is a cross-sectional view showing the structure of a conventional Fresnel lens combined lamp.
FIG. 13 is a cross-sectional view showing the structure of a conventional lamp.
[Explanation of symbols]
  1,11,21,31,41 Lamp
  2,42 Light emitting device
  3, 43, 52, 62 Radiation source
  4a, 4b, 45 reflector
  5a, 5b, 15a, 15b, 15c, 15d, 22, 32 segments
  9b Optical surface

Claims (3)

A radiation source that emits light in at least a two-dimensional direction;
A reflector made of a transparent body , arranged around the entire circumference of the radiation light source, and composed of a plurality of segments for reflecting light emitted from the radiation light source in a two-dimensional direction and transmitted through the transparent body upward by total reflection ; With
The radiation source has a reflecting surface or lens surface radiates to a two-dimensional direction the light from the light emitting element, also, a plurality segments of the reflector, condensing with condensation degrees corresponding to irradiation density from the radiation source Segments having different luminosities, the segments having a curvature to control brightness, and having a plurality of segments having different distances from the radiation source, and the segments having different distances from an inner segment A lamp characterized in that outer segments are arranged apart from each other , and that adjacent reflector segments have different distances from the center, and adjacent segments are arranged alternately .   2. The lamp according to claim 1, wherein the segment of the reflector is at least twice as long as the shortest one from the radiation source. The radiation source is
A flat surface is formed in the central portion facing the upper surface of the light emitting element,
The optical surface having a shape obtained by rotating a part of a parabola around the Z-axis with the center of the light-emitting surface of the light-emitting element as a reflecting surface following the center portion, with the focal point being the X-axis direction as a symmetry axis
The side surface of the radiation source is part of a spherical surface centered on the light emitting element,
The lamp according to claim 2, wherein the flat surface, the optical surface, and the side surface are formed of a transparent optical material that seals the light emitting element.

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