JP2004218290A - Light emitting diode condenser and embedded type beacon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting diode condenser condensing a plurality of emitting diode light to a small sectional area by means of a reflecting mirror and an embedded beacon using the same. <P>SOLUTION: The light emitting diode condenser 1 is provided with a parabolic reflecting mirror 1a and a plurality of light emitting diodes 1b arranged so as to concentrate the respective optical axes 1b1 toward the focal point f of the parabolic reflecting mirror 1a. The parabolic reflecting mirror 1a is formed from nearly one side half of the optical axis. The light emitting condenser 1 is contained, for instance, in an illuminator 10 provided with a projecting aperture 11c of an embedded beacon light 100 with a projecting aperture 11c at the disposed face on the ground face. Light beam obtained from the parabolic reflecting mirror 1a is projected on the outside through the projecting aperture 11c. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light-emitting diode condensing device for condensing light emitted from a plurality of light-emitting diodes, and an embedded marker light using the same.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to obtain a desired luminous intensity using a light emitting diode, an LED module in which a large number of light emitting diodes are mounted on a plane at high density is formed (for example, see Patent Document 1). Patent Literature 1 also describes that the LED module is used as a light source of an embedded marker for an airport.
[0003]
Further, in order to obtain even higher luminance, a lighting device having a two-layer structure in which light-emitting diodes are mounted shifted in two layers before and after is also known (for example, see Patent Document 2).
[0004]
It is also known that an optical control means such as a lens or a prism is arranged on the front surface of a light emitting diode to condense or control light distribution from an LED chip (for example, see Patent Document 3).
[0005]
[Patent Document 1]
JP-A-2002-8414
[Patent Document 2]
JP-A-11-185517
[Patent Document 3]
JP-A-11-162232
[Problems to be solved by the invention]
However, in some cases, brighter illumination than that obtained in Patent Documents 1 and 2 is required, and a light-collecting device that can cope with such a demand is expected. For example, even in the case of a recessed marker light for an airport, a light output of even higher luminous intensity must be possible in the case of a marker light for low visibility.
[0006]
Even with the conventional technology, if an LED module with a large area and a large number of light emitting diodes mounted is prepared, and a marker light with a corresponding large light-emitting window is used, an embedded type with a higher luminous intensity will be used. You can also get a sign light. However, such an embedded marker light necessarily has a large protruding height from the ground. In order for a vehicle to be able to travel on a recessed beacon, it is necessary to ensure that the beacon is strong enough to handle it and minimize the impact of the vehicle as it passes over it. There is a need to. For this reason, the portion of the recessed marker light protruding from the ground must be minimized. Therefore, if a large-area LED module and a large light-emitting window corresponding to the LED module are used, a desired embedded marker lamp cannot be obtained.
[0007]
On the other hand, in the optical control means as disclosed in Patent Document 3, the optical control means is arranged in a one-to-one relationship with respect to the light emitting diode chips, and a plurality of light emitting diode chips are required as one lighting device. Care is taken to satisfy the required optical characteristics. Therefore, even if the light distribution characteristics can be controlled, the luminous intensity is basically the same as that of Patent Document 1, and it is not possible to respond to a demand for a light output with a higher luminous intensity. Further, since the light emitting diodes and the optical control means are used in a one-to-one relationship, not only the structure becomes complicated, but also the demand for minimizing the portion of the recessed sign lamp protruding from the ground cannot be met.
[0008]
On the other hand, for example, in the case of a recessed sign for an airport, predetermined light distribution characteristics must be satisfied. When a light output of a predetermined luminous intensity is obtained using a plurality of light emitting diodes, there is a problem that light distribution control is generally difficult.
[0009]
An object of the present invention is to provide a light-emitting diode condensing device that condenses light emitted from a plurality of light-emitting diodes to a portion having a small cross-sectional area by using a reflecting mirror, and an embedded marker light using the same.
[0010]
It is another object of the present invention to provide a recessed marker light which satisfies a demand for minimizing a portion protruding from the ground.
[0011]
Still another object of the present invention is to provide a light-emitting diode condensing device in which light distribution control is easy and an embedded marker light using the same.
[0012]
[Means for achieving the object]
The light-emitting diode condensing device according to the first aspect of the present invention includes a parabolic reflector; and a plurality of light-emitting diodes arranged so that respective optical axes are concentrated toward the focal point of the parabolic reflector. It is characterized by doing.
[0013]
In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.
[0014]
<Regarding Parabolic Reflector> The parabolic reflector is partially removed in order to arrange a plurality of light emitting diodes so as to irradiate light toward the focal point. The degree of removal can be determined as appropriate, but it is relatively convenient to set the half as the boundary of the optical axis of the paraboloid. However, if necessary, less than half or more than half can be left.
[0015]
The parabolic surface may have a parabolic shape in any of two dimensions and three dimensions. The two-dimensional parabolic structure can be formed so as to have a parabolic surface in the vertical direction, but to have a non-parabolic planar reflection characteristic in the horizontal direction. The three-dimensional paraboloid structure has a shape of at least a part of the paraboloid of revolution around the entire optical axis.
[0016]
The paraboloid has a parabolic surface formed on the surface of a substrate made of glass, plastics, metal, or the like, and a reflective film of a metal having high reflectivity such as silver or aluminum is formed on the surface. Can be formed. However, the parabolic reflection surface may be formed of a metal having high reflectance characteristics.
[0017]
Further, the parabolic reflector can form a transparent film on the reflection surface to enhance its durability. The transparent coating is Al ₂ O ₃ , SiO ₂ Or a plastic such as silicone, polyester, or epoxy.
[0018]
Further, the direction of the optical axis of the parabolic reflector is set so that the collected light beam is projected in a desired light projection direction.
[0019]
<About Plurality of Light Emitting Diodes> The plurality of light emitting diodes are arranged such that their optical axes pass through the focal point of the parabolic reflector and enter the parabolic reflector. Note that the “optical axis” of the light emitting diode refers to an axis passing through the main peak of the light distribution characteristics of the light emitting diode.
[0020]
In the present invention, the light distribution characteristics of the light emitting diode are not particularly limited. However, the narrower the light distribution characteristics, the higher the light collection efficiency, which is preferable.
[0021]
The arrangement of the plurality of light emitting diodes with respect to the parabolic reflector may be performed along an arc centered on the focal point, or along a straight line perpendicular to or at an appropriate angle to the optical axis. Is also good. The latter case is convenient in that the light emitting diode can be mounted on a flat wiring board, but it is necessary to change the mounting angle of the light emitting diode according to the degree of separation from the optical axis of the parabolic reflector. That is, the mounting angle of the light emitting diode must be managed.
[0022]
Further, the light emitting diode is selected according to the required chromaticity for the emission color. When a desired light emission color cannot be obtained by a single light emitting diode, or when desired, the light emission of a plurality of colors can be added and mixed to obtain a desired light emission color. For example, in order to obtain white light, it is only necessary to use light-emitting diodes of three colors of RGB to light them simultaneously or in a time-division manner. In the latter case, even in the case of time-division lighting, it can be sensed as white light due to the afterimage effect of the human eye. However, a light emitting diode that emits white light by itself or a light emitting diode that emits white light by using two types of light emitting diodes of two-color light emission having a complementary color relationship can be used.
[0023]
Furthermore, when a plurality of types of light-emitting diodes are provided, by selectively turning on the light-emitting colors, it is possible to generate switchable multi-color marker lights.
[0024]
Furthermore, various types of light emitting diodes, such as a shell type, a surface mount type, and an integrated type, can be used. In the present invention, the “bombshell shape” is a configuration in which a light emitting diode chip is sealed inside a plastic lens and a lead wire extends from the back surface. The “surface mounting type” has terminals for surface mounting formed on the back surface and / or side surfaces instead of extending lead wires. The “integrated type” is a configuration in which a plurality of light emitting diode chips are arranged on a single substrate.
[0025]
<Other Configurations of the Present Invention> Although not an essential component of the present invention, by selectively adding the following configurations as desired, the performance as a light-emitting diode light-collecting device can be improved or the functions can be improved. And can be added.
[0026]
1. Light Path Changing Means The light path changing means can be combined to project a light beam emitted from the parabolic reflector in a desired direction. As the optical path changing means, a plane reflecting mirror, a prism, or the like can be used.
[0027]
2. Unitization The parabolic reflector and the plurality of light-emitting diodes can be unitized by fixing them in a predetermined positional relationship by support means. Therefore, it is possible to mount the light-emitting diode condensing device on an embedded marker light or the like in a unit unit.
[0028]
3. Wiring Board A wiring board can be used to wire a plurality of light emitting diodes in a predetermined manner. In the case where a plurality of light emitting diodes are arranged in an arc, if a flexible wiring board is used, wiring becomes easy. On the other hand, when a plurality of light emitting diodes are arranged in a straight line, a rigid wiring board can be used.
[0029]
4. Light-emitting diode drive circuit A light-emitting diode drive circuit is a circuit for lighting a light-emitting diode at a predetermined luminous intensity. The light-emitting diode drive circuit must be arranged integrally with the light-emitting diode, for example, by arranging it on the back surface of a wiring board. Can be.
[0030]
5. Alignment body The alignment body is means for maintaining the arrangement of a plurality of light emitting diodes in a predetermined positional relationship, and is particularly suitable for a bullet-shaped light emitting diode having a transparent resin mold lens. Also, when a plurality of light emitting diodes are arranged along a straight line, it is suitable for managing the mounting angle of the light emitting diodes. Further, by forming the alignment body with a good thermal conductor, it is possible to promote heat radiation of the light emitting diode and contribute to maintaining a high luminous efficiency.
[0031]
<Operation of the Present Invention> In the present invention, when light emitted from a plurality of light emitting diodes along their optical axes passes through the focal point of the parabolic reflector and enters the parabolic reflector, the light is reflected. Then, the light is emitted as a light beam condensed along the optical axis. As a result, the light emitted from the plurality of light emitting diodes is condensed by the parabolic reflector on a portion having a small cross-sectional area, so that a high-luminance light beam can be obtained. Therefore, the obtained high-intensity light beam can be used for various purposes.
[0032]
Further, since the light-emitting diode condensing device of the present invention uses a parabolic reflector for condensing, the light-emitting diode condensing device can be downsized.
[0033]
Furthermore, the distance between the parabolic reflector and the light emitting diode can be freely set. Therefore, the number of light emitting diodes to be used is increased and the light emitting diodes are arranged directly opposite the light emitting surface. However, the number of light emitting diodes can be arbitrarily set. Therefore, the luminous intensity of the obtained light beam can be further increased.
[0034]
According to a second aspect of the present invention, there is provided the light-emitting diode concentrator according to the first aspect, wherein the parabolic reflector is substantially half of one side of the optical axis; It is arranged on the other side of the optical axis of the reflecting mirror;
[0035]
The present invention specifies a configuration suitable for focusing using a parabolic reflector. That is, since the parabolic reflector has the above-described configuration, the parabolic reflector becomes compact, and a plurality of light emitting diodes can be easily arranged such that the optical axes pass through the focal point of the parabolic reflector.
[0036]
According to a third aspect of the present invention, there is provided a light-emitting diode condensing device, comprising: a parabolic reflector having a plurality of unit parabolic reflection surfaces; And a plurality of light emitting diodes arranged toward the light emitting diode.
[0037]
The present invention defines a configuration suitable for controlling the light distribution of the obtained light beam as desired.
[0038]
<Regarding Parabolic Reflecting Mirror> The parabolic reflecting mirror has a matrix spread, and when the whole is regarded as a row and a column, a plurality of unit reflectors are provided in at least one of the row and the column. It constitutes an object reflection surface. Therefore, the parabolic reflector can be selectively configured as each of the modes listed below.
[0039]
(1) An aspect in which one unit parabolic reflection surface is constituted in units of rows
In this case, the direction of the optical axis can be set individually for each unit parabolic reflection surface in rows so as to satisfy the desired light distribution characteristics. Thereby, the light distribution characteristics in the vertical plane can be controlled.
[0040]
{Circle over (2)} An aspect in which one unit parabolic reflection surface is constituted in a row unit
In this case, the direction of the optical axis can be set individually for each unit parabolic reflection surface in a row so as to satisfy desired light distribution characteristics. Thereby, the light distribution characteristics in the horizontal plane can be controlled.
[0041]
(3) An aspect in which one unit parabolic reflection surface is formed at each intersection of a row and a column
In this case, the direction of the optical axis can be set individually for each single unit parabolic reflection surface so as to satisfy the desired light distribution characteristics. Thereby, the projection space can be divided into a matrix and the light distribution can be controlled at each intersection of a row and a column. Therefore, the light distribution characteristics in the vertical and horizontal planes can be finely controlled, that is, even when the required level of light distribution control is very high, accurate control can be achieved.
[0042]
(4) A part of the whole constitutes one unit parabolic reflection surface in units of rows or columns, and the other part constitutes one unit parabolic reflection surface in units of columns or rows. Mode
In this embodiment, a part of the parabolic reflector controls a light distribution characteristic in a vertical or horizontal plane, and the remaining part controls a light distribution characteristic in a horizontal or vertical plane, thereby achieving a desired light distribution characteristic. Can be satisfied. Thereby, the light distribution characteristics in the vertical and horizontal planes can be controlled.
[0043]
(5) An aspect in which a part of the whole constitutes one unit parabolic reflection surface in units of rows or columns, but the remaining part constitutes one unit parabolic reflection surface in units of rows and columns.
In the case of this embodiment, the projection space is divided into a matrix by forming a unit parabolic reflection surface in units of intersections of rows and columns so as to satisfy a desired light distribution characteristic by a part of the parabolic reflection mirror. The desired light distribution characteristics can be satisfied by controlling the light distribution at each intersection of the rows and columns and controlling the light distribution characteristics of the remaining portion in a horizontal or vertical plane. Thereby, for example, the light distribution control is performed in units of intersections of the rows and columns of the parabolic reflector, and the other regions are controlled in units of rows or columns in units where the light distribution control is required to be precisely performed. The light distribution can be controlled mainly by individually setting the direction of the optical axis. Therefore, the light distribution characteristics in the vertical and horizontal planes can be finely controlled in a desired region, and the other regions can be controlled as desired with general accuracy.
[0044]
<About Plurality of Light Emitting Diodes> A plurality of light emitting diodes are arranged in a matrix in opposition to a parabolic reflector, and each optical axis has a predetermined unit parabolic reflection surface of the parabolic reflector. Although arranged so as to be focused via the focal point, the correspondence relationship between the individual light emitting diodes and the unit parabolic reflection surface can be configured as follows according to the mode of the parabolic reflector, for example. .
[0045]
In the case of the above mode (1), a plurality of light emitting diodes can be arranged in rows so that the optical axis of the light emitting diodes hits one unit parabolic reflection surface via the focal point.
[0046]
In the case of the above mode (2), a plurality of light emitting diodes can be arranged in a unit of a row so that the optical axis of the light emitting diode hits one unit parabolic reflecting surface via the focal point.
[0047]
In the case of the above mode (3), a plurality of light-emitting diodes can be arranged so that their optical axes hit the unit parabolic reflection surface via the focal point at the intersection of rows and columns.
[0048]
In the case of the above mode (4), a part of the plurality of light emitting diodes is arranged in units of rows or columns, and the optical axis thereof is arranged on one unit parabolic reflecting surface via the optical axis. The remainder can be arranged so that it conversely hits one unit parabolic reflection surface via its focal point in column or row units.
[0049]
In the case of the above mode (5), a part of the plurality of light emitting diodes is arranged so as to hit one unit parabolic reflection surface in a unit of a row or a column via its optical axis, and the remaining part is arranged in a line. And it can be arranged so as to hit the unit parabolic reflection surface via the optical axis at the intersection of the rows.
[0050]
Next, an arrangement of a plurality of light emitting diodes will be described. The plurality of light-emitting diodes can be arranged not only on the same plane but also shifted in front and rear or along a curved surface. Further, the plurality of light emitting diodes can be arranged in a one-to-one or one-to-one relationship with respect to one unit parabolic reflecting surface of the parabolic reflecting mirror.
[0051]
Thus, in the present invention, since the light distribution control is easy by having the above-described configuration, it is possible to satisfy the light distribution characteristics that are strictly required.
[0052]
Further, the present invention is applicable to various uses such as a sign lamp and a lighting fixture.
[0053]
An embedded marker light according to a fourth aspect of the present invention includes: an embedded marker light body having a light projecting window on a surface exposed to the ground; parallel light obtained from a parabolic reflector passes through the light projecting window. And a light-emitting diode condensing device according to any one of claims 1 to 3, which is housed inside the recessed-type marker lamp main body so as to be projected to the outside.
[0054]
<Recessed Beacon Light> The recessed beacon light is buried in the ground such as a road surface, and is mainly configured so that the top surface is exposed to the ground and the beacon light is projected from a through-hole window provided on the top surface. Have been. In addition, even if a part of the side surface of the embedded marker light is exposed on the road surface, it is permissible as long as it is entirely embedded in the road surface. In many cases, the embedded marker lights are provided with a required intensity so that the vehicle can travel on the upper part thereof. However, this is not an essential requirement of the present invention. In addition, the use of the recessed marker light may be any of various uses such as for airports and roads. However, the recessed marker lights of the present invention have a common feature that the light-emitting diode condensing device is used as a light source, regardless of the form and application. In the case of an embedded marker light for an airport, the present invention can be applied to, for example, a runway centerline light and a taxiway centerline light.
[0055]
<Regarding the Sign Light Body> The “recessed sign light body” refers to the remaining part of the recessed sign light excluding the light-emitting diode condensing device. The recessed marker light body includes optional components such as a lamp body and a base. The lamp body has an internal space for accommodating at least the light-emitting diode condensing device, and has a light emitting window on the upper surface communicating with the internal space.
[0056]
The internal space must be large enough to accommodate at least a light-emitting diode condensing device described later and connect a power supply thereto. In addition, the light-emitting diode condensing device is configured to be mounted using the internal space. In order to accommodate the light-emitting diode condensing device in the internal space, the lamp preferably includes an upper lamp and a lower lamp, and adopts a configuration in which both lamps are detachably covered. In the case of a recessed sign light, the upper lamp is exposed to the ground, but the lower lamp is indirectly buried directly in the ground or stored in a base buried in the ground. It is buried in the ground. The upper lamp body is provided with a through-hole window. The light-emitting diode condensing device may be attached to either the upper lamp body or the lower lamp body.
[0057]
The light emitting window is optically connected to the internal space of the lamp body of the embedded marker light body, and embeds the light beam obtained from the light-emitting diode condensing device with predetermined light distribution characteristics as the embedded marker light. It contributes to projecting outward from the built-in sign light. The light emitting window includes a light emitting window means for liquid-tightly shielding the inside and outside of the lamp body of the embedded marker light body. The light projecting window means may be one or more types of transparent bodies such as optically transparent window glass, prisms that refract light so as to emit marker light at a low elevation angle, and lenses that exhibit condensing or dispersing action. It can be composed of a composite. Further, a plurality of, for example, two light-emitting windows can be arranged so as to face each other with a staggered or appropriate angle provided to the lamp body of the embedded marker light main body as necessary.
[0058]
In addition, the lamp body of the embedded marker light main body can include a power supply introduction unit for introducing power from the outside, a mounting unit for installing the embedded marker light, and the like in addition to the above configuration. .
[0059]
Further, optional components include a base, an adjustment ring, an adapter, and a spacer. These components are selectively used as desired. The base has a cylindrical box shape with an open upper end, is buried in a state where the open end is exposed to the ground in advance, and is connected to a wiring cable buried underground. Further, the open end is provided with a bearing peripheral step portion for directly or indirectly supporting the peripheral edge of the lamp body of the recessed marker light main body. Therefore, the lamp body is detachably attached to the open end while the peripheral edge thereof is directly or indirectly supported on the support step of the base.
[0060]
The adjusting ring is effective when it is used to adjust the mounting direction of the lamp body in a horizontal plane as desired and mount the lamp body to the base. Further, the adapter is a means interposed between the base and the lamp to convert a power connection method by a piping method to a power connection method suitable for replacing the lamp. The spacer is used when the base is at a deep position from the road surface, for example, when the roadbed (ground) is raised, and is used to increase the mounting portion of the lamp body on the base.
[0061]
<Other Configurations of the Present Invention> Although not essential components of the present invention, the following configurations can be added as desired.
[0062]
1. Color Filter A color filter can be provided to give a predetermined color to the marker light. In general, the color filter is disposed on the inner surface of the light projecting window. In the present invention, since the light beam is obtained from the parabolic reflector, the parabolic reflector of the light-emitting diode condensing device can be used as required. It can be disposed at a desired position in the path of the light beam connecting the light beam to the inner surface of the light emitting window.
[0063]
2. Cut-out device When connecting a large number of recessed beacon lights in series to a constant current power supply, prevents the remaining recessed beacon lights from becoming chained when the light source becomes broken. To do so, a cut-out device can be provided in the recessed signpost. As the cutout device, a film cutout mainly composed of a non-linear resistor is generally used, but may be an electronic circuit.
[0064]
<Regarding the Operation of the Present Invention> In the present invention, by providing the above-described configuration, it is possible to easily obtain a luminous intensity as high as is necessary for the embedded marker lamp. In addition, since a light beam condensed with high efficiency can be obtained by utilizing the narrow-angle light distribution of a desired number of light-emitting diodes, a low-elevation angle light having a light distribution characteristic required for a recessed sign lamp can be obtained. Irradiation can be performed easily. Furthermore, even if the required number of light emitting diodes are used, the size of the recessed marker light does not increase.
[0065]
An embedded marker light according to a fifth aspect of the present invention is an embedded marker light body having a light projecting window on a surface exposed to the ground; and a light beam obtained from a parabolic reflector passes through the light projecting window. A plurality of sets of the light-emitting diode condensing device according to any one of claims 1 to 3, which are housed inside the recessed-type marker lamp main body so as to be projected in different directions outside. It is characterized by.
[0066]
The present invention specifies a configuration suitable for obtaining a desired light distribution characteristic by using a plurality of sets of light-emitting diode condensing devices.
[0067]
A plurality of sets of light-emitting diode light-collecting devices having the same light-collecting characteristics or different light-collecting characteristics can be used. However, in the present invention, various light distribution characteristics can be realized even if a plurality of sets of light-emitting diode light-collecting devices having the same light-collecting characteristics are used. In that sense, the light-emitting diode condensing devices of claims 1 and 2 are particularly suitable. In addition, since a desired light distribution characteristic over a vertical plane and a horizontal plane can be realized using a light-emitting diode light-collecting device having the same light-collecting characteristics, the structure is simplified and the design is facilitated.
[0068]
A preferred configuration example in the present invention is as follows. The light distribution in the vertical plane is secured as a light beam by a light-emitting diode condensing device, and the horizontal light distribution is set by extending the optical axis of multiple light-emitting diode condensing devices to the left and right to achieve a horizontally long light distribution characteristic. can do.
[0069]
However, according to the present invention, if necessary, a horizontal light distribution can be secured by the light-emitting diode condensing device, and the light distribution in the vertical plane can be set among the plurality of light-emitting diode condensing devices.
[0070]
Thus, in the present invention, since a plurality of sets of light-emitting diode condensing devices are combined, it is possible to obtain an embedded marker light having desired light distribution characteristics in both a vertical plane and a horizontal plane.
[0071]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0072]
FIGS. 1 and 2 show a first embodiment of a light-emitting diode condensing device of the present invention and an embedded marker lamp using the same together with a conventional example, FIG. 1 is a plan view, and FIG. It is sectional drawing which divides the cross section which follows the II-II 'line | wire at the center, and shows this embodiment in the left half, and the conventional example in the right half, respectively.
[0073]
In each of the drawings, reference numeral 1 denotes a light-emitting diode condensing device, and ML denotes an embedded marker light, all of which are embodiments of the present invention. PA is a conventional light-emitting diode light condensing device.
[0074]
<Light Emitting Diode Concentrating Device 1> The light emitting diode condensing device 1 includes a parabolic reflector 1a and a plurality of light emitting diodes 1b.
[0075]
The parabolic reflector 1a has a paraboloid of an upper half from the optical axis in a vertical plane, and forms a plane reflector in a horizontal plane, that is, a direction orthogonal to the drawing. Note that f is the focal point of the parabolic reflector 1a.
[0076]
The plurality of light emitting diodes 1b have a shell shape, and are dispersedly arranged along an arc centered on the focal point f so that each optical axis 1b1 converges on the focal point f of the parabolic reflector 1a. . That is, each light emitting diode 1b is attached so that its optical axis 1b1 is along the perpendicular of the arc at the arrangement position.
[0077]
In this embodiment, four light emitting diodes 1b are used as a plurality of light emitting diodes 1b in a vertical plane. In a horizontal plane orthogonal to the drawing, an arbitrary number of light emitting diodes necessary for obtaining a light beam having a desired width are arranged.
[0078]
In this way, the plurality of light emitting diodes 1b emit narrow-angle light emission having a peak at each optical axis light 1b1 toward the focal point f of the parabolic reflector 1a. When the light emitted from the plurality of light emitting diodes 1b enters the parabolic reflector 1a, the light is reflected on the surface of the parabolic reflector 1a, condensed into a light beam having a small cross section, and emitted.
[0079]
On the other hand, in the conventional light-emitting diode condensing device PA, a plurality of, for example, two light-emitting diodes 1b are simply aligned with their respective optical axes directed to the light-entering surface of the prism 13, which is the direction in which light is to be emitted. It consists of. Therefore, when obtaining a light beam in a part of a given area, the luminous intensity of the obtained light beam is determined by the maximum number of light emitting diodes that can be arranged in the area.
[0080]
<Recessed Beacon Light ML> The recessed beacon light ML includes a recessed beacon light main body 100 and a light-emitting diode condensing device 1. In addition, 21 is the ground.
[0081]
The embedded marker light main body 100 includes a lamp body 10. The lamp body 10 mainly includes an upper lamp body 11 and a lower lamp body 12, and includes an internal space 10a. In the drawings, reference numeral 13 denotes a prism, and 14 denotes a holding frame.
[0082]
The upper lamp body 11 has a bulging portion 11a, a light guiding groove 11b, and a light projecting window 11c on an upper surface thereof. The bulging portion 11 a is formed on the upper surface of the upper lamp body 11 in a truncated cone shape having a circular flat top surface in the center and a conical slope extending from the top surface to the periphery of the upper lamp body 11. The desired number of the light guide grooves 11b can be provided. The light guide groove 11b is open to the slope of the truncated cone of the bulging portion 11a and communicates with the internal space 10b of the lamp body 10. The light projecting window 11c is provided in a communicating portion between the light guide groove 11b and the internal space 10b of the lamp body 10, and the prism 13 as a through-hole window means is formed on the upper lamp body 11 by a gasket and a holding frame 14 (not shown). Liquid tightly fixed. Further, a plurality of bolt insertion holes 10 c for forming the lamp body 10 by connecting the upper lamp body 11 and the lower lamp body 12 are formed in the peripheral portion of the lamp body 10.
[0083]
The lower lamp body 12 has a dish shape, is liquid-tightly covered with the lower surface of the upper lamp body 11 by stud bolts and cap nuts (both are not shown), and cooperates with the upper lamp body 11 to form an interior. A space 10a is formed. Although not shown, a terminal block for introducing a power supply into the internal space 10a is provided.
[0084]
The light-emitting diode condensing device 1 is disposed in the internal space 10a of the lamp body 10, and the light beam emitted from the light-emitting diode condensing device 1 is condensed to the size of the light incident surface of the prism 13 in FIG. The light is emitted obliquely to the upper left and enters the light incident surface of the prism 13. The light beam is refracted in the process of transmitting through the prism 13 and exiting from the light exit surface, passes through the light guide groove 11b from the through-hole window 11c, and is projected from the lamp body 10 to the outside as a marker light at a low elevation angle.
[0085]
Hereinafter, another embodiment of the light-emitting diode condensing device and the embedded marker lamp of the present invention will be described with reference to FIGS. In each figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.
[0086]
FIGS. 3 and 4 show a second embodiment of the light-emitting diode condensing device and the recessed marker light of the present invention, and FIG. 3 shows the arrangement of the light-emitting diode condensing device inside the lamp body in the left half. , The right half is a central cross-sectional plan view showing a plane, and FIG. 4 is a central cross-sectional view showing the left half of a cross section along the line IV-IV ′ in FIG.
[0087]
This embodiment is different in that three sets of light-emitting diode condensing devices 1, 1 'are arranged. Each of the three sets of light-emitting diode concentrators 1 and 1 ′ has the same configuration in the vertical plane, but has a different configuration in the horizontal plane between the light-emitting diode concentrators 1 and 1 ′.
[0088]
In the light-emitting diode condensing device 1, the parabolic reflecting mirror 1 a is formed to be long in the horizontal plane, and is disposed so as to face the light incident surface of the prism 13. Further, five light emitting diodes 1b are arranged in a horizontal plane and four in a vertical plane, that is, a total of 20 light emitting diodes 1b are arranged.
[0089]
On the other hand, the light-emitting diode condensing device 1 ′ is arranged in a pair on each side of the light-emitting diode condensing device 1 in the horizontal plane, the parabolic reflector 1 a is formed short in the horizontal plane, and The parabolic reflector 1 a is arranged to be inclined to the opposite side to the light incident surface of the prism 13 so that the optical axis of the parabolic reflector 1 a intersects the optical axis of the prism 13. Each of the light emitting diodes 1b is arranged in one row in a horizontal plane and four in a vertical plane, that is, a total of four light emitting diodes 1b.
[0090]
Thus, in the present embodiment, since the above configuration is provided, the main light distribution portion in the center is handled by the light-emitting diode condensing device 1, and the light distribution portions extending to both sides in the horizontal direction are paired with the left and right. The light-emitting diode light-collecting device 1 'can be in charge of a light distribution characteristic elongated in the horizontal direction. For this reason, it becomes light distribution characteristics suitable as an embedded signboard for airports.
[0091]
FIG. 5 is a cross-sectional view showing a third embodiment of the recessed marker light of the present invention.
[0092]
The present embodiment is different in that the parabolic reflector 1a is configured to include a plurality of rows, for example, three rows of unit parabolic reflection surfaces 1a1. That is, the unit parabolic reflection surfaces 1a1 of each row of the parabolic reflection mirror 1a extend in a direction orthogonal to the drawing.
[0093]
On the other hand, the plurality of light-emitting diodes 1b are arranged in a matrix of a plurality of rows, for example, three rows, and the light-emitting diodes 1b of each row are arranged such that the optical axis thereof is in each row of the parabolic reflector 1a. Of the unit parabolic reflection surface 1a1 via the focal point thereof.
[0094]
In the present embodiment, the embedded marker light main body 100 includes a base 20 in addition to the lamp body 10 and the light-emitting diode condensing device 1. The base 20 is embedded in advance on a road surface 21 via an adhesive layer 22 and supports the lamp body 10 in a detachable manner. It has a dish shape with an open upper end, and is provided with a peripheral step portion 20a in the opening portion to support the peripheral edge portion of the lamp body 10.
[0095]
In addition, the base 20 includes a power supply introduction unit (not shown), a power supply terminal block, a through hole formed in a peripheral step, and the like. The power supply introduction unit introduces a series connection wiring extending from the constant current power supply into the base 20. The power terminal block is connected to the above-mentioned wiring, and further connected to a power receiving terminal (not shown) of the lamp body 10. A stud bolt (not shown) is inserted through the through-hole, and with the leg tip protruding from the peripheral step, the opposing through-hole of the lamp body 10 is inserted through the stud bolt, and a cap nut (illustrated). The lamp body 10 is fixed by screwing the lamp body 10. The space between the base 20 and the lamp body 10 is sealed in a liquid-tight manner by a packing P made of an O-ring.
[0096]
Note that a plurality of heat radiation fins 12a are formed on the lower surface of the lower lamp body 12 of the lamp body 10 so that heat generated by the plurality of light emitting diodes 1b is easily dissipated into the base 20.
[0097]
Thus, in the present embodiment, by providing the above configuration, it is possible to control the light distribution as desired by individually setting the direction of the optical axis for each unit parabolic reflection surface. Becomes possible.
[0098]
FIGS. 6A and 6B show a light emitting diode group according to a fourth embodiment of the light emitting diode condensing device and the recessed marker light of the present invention. FIG. 6A is a sectional view, and FIG. is there.
[0099]
This embodiment is a first example suitable for arranging a plurality of bullet-shaped light emitting diodes at high density. In other words, the configuration is such that a plurality of, for example, 14 bullet-shaped light emitting diodes 1b are arranged in two rows in front and rear, and two rows in each row, using the first and second wiring boards 2A and 2B.
[0100]
The first wiring board 2A mounts the light emitting diodes 1bA in the preceding stage in two rows with the small holes 2a interposed therebetween. The second wiring boards 2B are mounted in two rows such that the heads of the light emitting diodes 1bB at the subsequent stage contact the small holes 2a of the first wiring board 2A.
[0101]
Then, when viewed from the front, the light-emitting diode group is densely mounted at intervals smaller than the outer diameter of the light-emitting diode. Since the light emitting diode emits light mainly from the center of the top, the light emission is not substantially blocked.
[0102]
FIG. 7 shows a light-emitting diode group according to a fifth embodiment of the light-emitting diode condensing device and the recessed marker light of the present invention. FIG. 7 (a) is a sectional view, and FIG. 7 (b) is a plan view. is there.
[0103]
This embodiment is a second example suitable for arranging a plurality of light emitting diodes at high density. In other words, the configuration is such that two types of light emitting diodes 1bC and 1bD are combined and arranged at high density on a single wiring board 2.
[0104]
The light emitting diode 1bC is made of a bullet-shaped light emitting diode and is tall. The light emitting diode 1bD is of a small surface mount type and is short. The light emitting diodes 1bC and 1bD are alternately arranged and mounted on the wiring board 2.
[0105]
Thus, in the present embodiment, even if the two types of light emitting diodes 1bC and 1bD are mounted so as to partially overlap each other, light emission from the light emitting diodes is performed from the central portion, so that light emission is substantially performed. It will not be blocked.
[0106]
8A and 8B show a light-emitting diode group according to a sixth embodiment of the light-emitting diode condensing device and the embedded marker light of the present invention. FIG. 8A is a cross-sectional view, and FIG. is there.
[0107]
This embodiment is a third example suitable for arranging a plurality of light emitting diodes at high density. In other words, the configuration is such that the light emitting diodes are mounted on a single wiring board 2 in two levels of high and low and are arranged at high density.
[0108]
Each of the light emitting diodes 1b is composed of a bullet-shaped light emitting diode. Then, the adjacent light emitting diodes 1b are mounted alternately at different heights. That is, in order to mount at a high position, the lead wires are exposed on the surface of the wiring board 2. On the other hand, when mounting at a low position, the lead wires are not exposed on the surface of the wiring board 2. In FIG. 8B, the lower light emitting diode 1b is represented by a small circle in order to easily identify the light emitting diode having a higher or lower level.
[0109]
Thus, in the present embodiment, with the above configuration, even if the light emitting diodes 1b of the same type are mounted while their adjacent ones partially overlap each other, the light emission from the light emitting diodes Is performed from the center, so that light emission is not substantially blocked.
[0110]
In the three preferred examples of the high-density mounting of the light emitting diodes described above with reference to FIGS. 6 to 8, the light emitting diode located on the front side and the light emitting diode located on the rear side are directly viewed from the front. In addition to being arranged on the line, the light emitting diodes on the front side may be arranged so as to be shifted so that the row of the light emitting diodes is positioned between the rows, so that higher density mounting is performed. It becomes possible.
[0111]
【The invention's effect】
According to the first aspect of the present invention, by providing a plurality of light emitting diodes arranged so that each optical axis is concentrated toward the focal point of the parabolic reflector, a plurality of light emitting diodes are provided using the reflector. A light-emitting diode condensing device that condenses light emitted from a light-emitting diode to a portion having a small cross-sectional area can be provided.
[0112]
According to the second aspect of the present invention, in addition, since a plurality of light emitting diodes are arranged on the other side of the optical axis of the parabolic reflector consisting of substantially half of one side of the optical axis, the size is reduced, and It is possible to provide a light-emitting diode condensing device that facilitates disposing the light-emitting diode so that its optical axis passes through the focal point of the parabolic reflector.
[0113]
According to the third aspect of the present invention, a plurality of light-emitting diodes arranged in a parabolic reflecting mirror having a plurality of unit parabolic reflecting surfaces with their respective optical axes directed to the focal point of a predetermined unit parabolic reflecting surface are provided. Since the light distribution control is provided, the light distribution control is easy, so that it is possible to provide a light-emitting diode condensing device that satisfies the demanding light distribution characteristics.
[0114]
According to the fourth aspect of the present invention, the light beam obtained from the parabolic reflector is housed inside the recessed marker light so that the light beam is projected to the outside via the light projecting window. The light-emitting diode condensing device according to any one of the above items 3 is used to perform low-elevation-angle light irradiation having a required light distribution characteristic at a required high intensity and to use a required number of light-emitting diodes. It is possible to provide an embedded marker light whose size does not increase even if it is used.
[0115]
According to the fifth aspect of the present invention, a plurality of light beams received from the inside of the recessed-type marker lamp main body are so arranged that the light beam obtained from the parabolic reflector is projected in different directions outside through the light projecting window. By providing a set of the light-emitting diode condensing device according to any one of claims 1 to 3, it is possible to provide an embedded marker light having a desired light distribution characteristic in both a vertical plane and a horizontal plane. Can be.
[Brief description of the drawings]
FIG. 1 is a plan view showing a first embodiment of a light-emitting diode condensing device of the present invention and a recessed marker light using the same together with a conventional example.
FIG. 2 is a cross-sectional view showing the present embodiment in the left half and a conventional example in the right half, respectively, with a cross section taken along the line II-II ′ of FIG.
FIG. 3 shows a light-emitting diode condensing device and a recessed-type marker lamp according to a second embodiment of the present invention, in which the left half shows the arrangement of the light-emitting diode condensing device inside the lamp body, and the right half shows a plane. Cross section plan view
4 is a central sectional view showing a left half of a section taken along line IV-IV ′ of FIG. 3;
FIG. 5 is a sectional view showing a third embodiment of the recessed marker light according to the present invention.
FIGS. 6A and 6B show a light-emitting diode group according to a fourth embodiment of the light-emitting diode condensing device and the recessed marker light of the present invention, wherein FIG. 6A is a cross-sectional view and FIG.
FIGS. 7A and 7B show a light-emitting diode group according to a fifth embodiment of the light-emitting diode condensing device and the recessed marker light of the present invention, wherein FIG. 7A is a cross-sectional view and FIG.
FIGS. 8A and 8B show a light-emitting diode group according to a sixth embodiment of the light-emitting diode condensing device and the recessed marker light of the present invention, wherein FIG. 8A is a cross-sectional view and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Light emitting diode condensing device, 1a ... Parabolic reflector, 1b ... Light emitting diode, 10 ... Lamp body, 10a ... Internal space, 11 ... Upper lamp body, 11a ... Swelling part, 11b ... Light guide groove, 11c ... light emitting window, 12 ... lower lamp, 13 ... prism, 14 ... holding frame, 100 ... recessed sign light body, ML ... recessed sign light for airport

Claims (5)

A parabolic reflector;
A plurality of light emitting diodes arranged to focus each optical axis towards the focal point of the parabolic reflector;
A light-emitting diode condensing device, comprising: A parabolic reflector consists of approximately half of one side of the optical axis;
A plurality of light emitting diodes are arranged on the other side of the optical axis of the parabolic reflector;
The light-emitting diode condensing device according to claim 1, wherein: A parabolic reflector having a plurality of unit parabolic reflectors;
A plurality of light emitting diodes arranged with each optical axis directed to a focal point of a predetermined unit parabolic reflecting surface of the parabolic reflecting mirror;
A light-emitting diode condensing device, comprising: An embedded marker light body having a light-emitting window on a surface exposed to the ground;
The light-emitting diode according to any one of claims 1 to 3, wherein the light beam obtained from the parabolic reflector is housed inside the recessed-type marker lamp main body so as to be projected to the outside via the light projecting window. Light collector;
A recessed-type sign light characterized by comprising: An embedded marker light body having a light-emitting window on a surface exposed to the ground;
4. A plurality of sets housed inside a recessed-type marker lamp body such that a light beam obtained from a parabolic reflector is projected in different directions outside through a light projecting window. A light-emitting diode concentrator according to any one of the preceding claims;
A recessed-type sign light characterized by comprising:

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