JP4415249B2 - Condenser and light source device using the same - Google Patents

Description

  The present invention relates to a light source device that can be used for, for example, a warning light that is installed at a construction site or the like and emits a warning signal such as blinking light, an illumination device, and the like, and a concentrator therefor.

Some of the warning lights described above include an LED as a light source and a condenser including a reflecting surface for irradiating light from the LED forward.
Moreover, not only a warning light but a concentrator includes a lens unit disposed in front of the light source and a reflecting surface disposed around the lens unit and the light source (for example, Patent Documents 1 and 2). reference.).
JP 2002-176203 A JP 59-139064

The reflecting surfaces of the collectors described in Patent Documents 1 and 2 are formed in a single predetermined paraboloid shape. Typically, the light source is placed at the focal point of the paraboloid shape, the paraboloid shape near the light source is made larger than the size of the light source, and this paraboloid shape is extended to form the entire reflecting surface. As a result, the entire reflecting surface tends to increase in size.
On the other hand, if the above-mentioned predetermined parabolic reflecting surface is shortened along the optical axis in an attempt to reduce the size of the concentrator, for example, the proportion of light emitted from the light source forward The light utilization efficiency is reduced.

Further, the above-described concentrator and the light source device configured to include the concentrator and the light source are used not only for warning lights but also for various devices and devices such as illumination devices. There is a demand for improvement in light utilization efficiency.
SUMMARY OF THE INVENTION An object of the present invention is to provide a compact condenser and light source device with high light utilization efficiency.

  In order to achieve the above-mentioned object, the present inventor makes the predetermined paraboloid shape of the reflecting surface different from the conventional paraboloid shape, for example, a focus as a variable for determining the paraboloid shape. It was considered to form a parabolic reflecting surface with a small distance (corresponding to the distance between the intersection of the rotation center axis and the parabolic surface and the focal point in the rotating paraboloid shape). Such a parabolic reflecting surface with a small focal length can reflect light with a small angle between the radiation direction and the optical axis even if the portion far from the focal point is miniaturized. However, on the other hand, such reflective surfaces approach the focal point and thus interfere with each other with the light source arranged at the focal point. If the part of the reflective surface near the focal point is removed to avoid interference, it will not be possible to receive light with a large angle between the radiation direction and the optical axis, resulting in low light utilization efficiency. There is. Therefore, the present inventor has conceived that a conventional reflecting surface having a single paraboloid shape is divided into a plurality of reflecting surfaces formed in a plurality of paraboloid shapes having different focal lengths, and these are combined. Furthermore, as a result of intensive studies, the present invention has been completed.

The light collector of the present invention is a light collector made of a translucent member, for condensing light emitted from a light source into parallel light along a predetermined optical axis, and the position where the light source is to be disposed. The first reflecting surface is formed in a substantially paraboloid shape with the light source position being substantially the focal position, and converts light emitted from the light source into a predetermined first radiation angle range into parallel light along the optical axis. The light source position is substantially the focal position, and is formed in a substantially parabolic shape that is located outside the first reflecting surface with respect to the optical axis, and is located outside the first radiation angle range from the light source. A second reflecting surface that converts light emitted into a predetermined second radiation angle range into parallel light along the optical axis, and the light source position is substantially a focal position, and the first reflecting surface with respect to the optical axis. From the light source to a predetermined third radiation angle range. The light emitted saw including a third reflecting surface for converting the parallel light along the optical axis, the third radiation angle range, radiation between said first radiation angle range and the second radiation angle range It is an angular range .

  According to this invention, a plurality of different paraboloid shapes can be used for the first, second, and third reflecting surfaces, and the degree of freedom in designing the concentrator can be increased. And improvement of light utilization efficiency. For example, it is possible to receive light having a large emission angle (angle with respect to the optical axis in the light emission direction) on the second outer reflection surface, and light having a smaller emission angle on the first reflection surface on the inner side. The first reflecting surface, which tends to increase in size, is arranged close to the optical axis, so that light radiated in a wide area can be received in a small area, and the size can be reduced while improving the light utilization efficiency. Further, even when the first reflecting surface is disposed close to the light source, the second reflecting surface can be provided outside the first reflecting surface while avoiding the light source, and the utilization efficiency of light from the light source can be further increased. Can be increased. In addition, since the third reflecting surface is used together with the first and second reflecting surfaces and is small in size, even if the third reflecting surface is arranged on the innermost side and arranged close to the light source, it can be arranged without any interference with the light source. It becomes. The outer side or the inner side of the radiation angle range is a side where the radiation angle is larger or smaller than the radiation angle range.

The upper Symbol third emission angle range, since it is the emission angle range between the first radiation angle range and the second radiation angle range, a third small the innermost of the three reflecting surfaces The reflecting surface can supplement both the first and second reflecting surfaces located outside the reflecting surface. Therefore, the light use efficiency can be further enhanced .

  In the present invention, it is preferable that a light source housing recess for housing the light source is formed at the light source position, and the third reflecting surface is formed by a projecting portion projecting into the light source housing recess. In this case, it is possible to effectively use the empty space in the light source housing recess and arrange the third reflecting surface in this space without difficulty. Moreover, if it is a protrusion part, it is not necessary to reduce the thickness of a translucent member locally, and generation | occurrence | production of a strength reduction can be suppressed.

  Further, in the present invention, a convex curved surface protruding in the direction away from the light source position in the vicinity of the optical axis, and any one of the first radiation angle range, the second radiation angle range, and the third radiation angle range from the light source. There may be a lens unit that converts light emitted to a predetermined central radiation angle range near the optical axis on the inner side to parallel light along the optical axis. In this case, the light in the central radiation angle range can be converted into parallel light, and the light utilization efficiency can be further enhanced.

  In the present invention, there may be further included a flat surface formed so as to connect between one edge of the first reflecting surface and one edge of the second reflecting surface and perpendicular to the optical axis. In this case, when receiving light with a small emission angle at the inner first reflection surface and receiving light with a large emission angle at the outer second reflection surface, the first reflection surface and the flat surface are orthogonal to the optical axis. It can shape | mold with the shaping | molding die cut out in the direction to do. Moreover, when the reflected light from a 2nd reflective surface permeate | transmits a flat surface, it can suppress that it refracts | refracts or reflects internally, and it is preferable for improving the utilization efficiency of light.

  The light source device of the present invention includes a light source and the light collector of the present invention for condensing light from the light source. According to the present invention, it is possible to realize a small light source device with high utilization efficiency of light from the light source.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a light source device according to an embodiment of the present invention.
The light source device 1 includes a light source 2, a condenser 4 for condensing light emitted from the light source 2 into parallel light along a predetermined optical axis 3, and a wiring board for supplying power to the light source 2. As a printed wiring board 5. The light from the light source 2 is converted into parallel light along a predetermined optical axis 3 via a condenser 4 and irradiated.

The light source 2 includes a light emitting diode (also referred to as an LED). The LED has a light emitting element (not shown) and emits light radially from the light emitting element.
A light source 2 and circuit components (not shown) are mounted on the printed wiring board 5 to constitute a circuit board. In addition, the light source 2 and the condenser 4 are disposed on one surface 5a of the printed wiring board 5, and the printed wiring board 5 functions as a support member that supports the light source 2 and the condenser 4, and the light source 2 and the condenser 4 function as a connecting member for mechanically connecting. Specifically, the printed wiring board 5 is provided with a plurality of through-holes 6 (only part of which are shown) for locking the condenser 4. Further, the concentrator 4 is provided with a plurality of leg portions 7 (only one part is shown) protruding from the end face of the concentrator 4 and hooks provided at the end portions of the plurality of leg portions 7 as locking members. Part 8. The flange portion 8 of the leg portion 7 penetrates the through hole 6 and engages with the peripheral edge portion of the through hole 6 to elastically prevent the leg portion 7 from coming off.

The light collector 4 is formed of a rotating body-shaped translucent member. As the translucent member, for example, a translucent synthetic resin such as an acrylic resin can be used. In addition, a known translucent member such as glass can also be used.
The rotating body shape of the condenser 4 is obtained by rotating a contour of a predetermined cross-sectional shape including a parabolic shape around the optical axis 3 as a rotation center axis. The condenser 4 has one end 9 and the other end 10 in the direction in which the rotation center axis extends.

  In the condenser 4, a light source position 11, which is a position where the light source 2 should be disposed, and a predetermined optical axis 3 are set in advance. The optical axis 3 is a straight line that extends forward through the light source position 11, is parallel to the parallel light emitted from the condenser 4, and is along the rotation center axis described above. The light source position 11 is provided at one end 9 of the condenser 4. For example, the other end 10 of the condenser 4 from the intersection of the optical axis 3 and the extended surface of the end face 12 of the one end 9. It is located on the optical axis 3 with a predetermined distance to the side.

  One end portion 9 of the condenser 4 is an end surface 12 for sandwiching the printed wiring board 5 as a connecting portion for connecting the light source 2 to the light source position 11 in the direction along the optical axis 3 in a positioning state and the above-described end surface 12. The above-mentioned plurality of legs engaged with the through-hole 6 of the printed wiring board 5 as a connecting part for connecting the light source 2 to the light source position 11 in a direction orthogonal to the optical axis 3 in a positioning state. Part 7 is included. The printed wiring board 5 is interposed between the light source 2 and the condenser 4 and functions as a positioning member for positioning them, and the light source 2 is positioned and fixed with respect to the through hole 6 described above. The light source 2 is held on the printed wiring board 5 such that the direction in which the light from the light source 2 is strongest coincides with the direction along the optical axis 3. In addition, a light source housing recess 13 for housing the light source 2 arranged here is formed at the light source position 11.

  The light source housing recess 13 is an annular first spherical surface portion 14 as a concave curved surface connected to a peripheral edge portion of an opening formed on the end surface 12 of the one end portion 9 via a cylindrical surface 13 a centering on the optical axis 3. And a projecting portion 15 that protrudes from the first spherical portion 14 to the inside of the light source accommodating recess 13 and has an annular shape, and a second spherical portion 16 as a concave curved surface formed inside the projecting portion 15. The projecting portion 15 has a substantially triangular shape in cross section, and the inner slope is formed by the second spherical portion 16, and the outer slope 17 has a parabolic shape so that the first and second spherical portions 14, The 16 peripheral parts are connected. The first and second spherical portions 14 and 16 are part of the spherical surface, and the center positions of the two spherical surfaces are located at the light source position 11, and the radius of the first spherical portion 14 is the second spherical portion 16. It is set larger than the radius. The first and second spherical portions 14 and 16 function as an incident surface of light from the light source 2 so as to face the light source 2, and are not refracted when radial light from the light source 2 is transmitted. .

The condenser 4 includes a lens unit 18 that converts light emitted from the light source 2 into parallel light along the optical axis 3. Light emitted from the light source 2 to a predetermined central emission angle range 19 near the optical axis 3 (only one side of the optical axis 3 is shown) is transmitted through the lens unit 18.
The lens portion 18 has a convex curved surface 18 a that protrudes in the direction away from the light source position 11 in the vicinity of the optical axis 3. The convex curved surface 18a is part of a spherical shape, for example, and functions as an exit surface. The center position of the lens unit 18 is disposed on the optical axis 3. The lens portion 18 is formed to be recessed from the end face 20 of the other end portion 10 so that a wide central emission angle range 19 can be secured.

The central radiation angle range 19 is set to a predetermined angle range on both sides of the optical axis 3, and for example, on one side, the range of the radiation angle value from 0 degree to the first angle value A1 (A1> 0) (0 to 0). A1) is set. Here, the radiation angle is an angle formed between the light beam emitted from the light source 2 and the optical axis 3, and the radiation angle when the light is radiated forward along the optical axis 3 is 0 degree. .
The condenser 4 includes a plurality of, for example, four reflecting surfaces 21A, 21B, 21C, and 21D. The three reflecting surfaces 21 </ b> A, 21 </ b> B, and 21 </ b> C are formed on the outer periphery of the condenser 4. The remaining reflecting surface 21 </ b> D is formed by the slope 17 of the protruding portion 15 in the light source housing recess 13.

Each of the reflecting surfaces 21A, 21B, 21C, and 21D is formed in a paraboloid shape having the light source position 11 as a focal position and the optical axis 3 as a rotation center axis, and is continuously formed around the optical axis 3 around the entire circumference. In the direction along the optical axis 3, each of the reflecting surfaces 21A, 21B, 21C, and 21D is formed with a predetermined width.
The reflection surface 21 </ b> A receives light emitted from the light source 2 to the predetermined radiation angle range 19 </ b> A, reflects the light on the inner surface, and converts it into parallel light along the optical axis 3. The radiation angle range 19A is set outside the central radiation angle range 19, that is, adjacent to the side where the radiation angle is larger than the central radiation angle range 19, and the radiation angle ranges from the first angle value A1 to the second angle value A2. The range (A1 to A2) up to (A2> A1) is set.

  The reflection surface 21 </ b> B receives light emitted from the light source 2 into the predetermined radiation angle range 19 </ b> B, reflects the light on the inner surface, and converts it into parallel light along the optical axis 3. The emission angle range 19B is set outside the emission angle range 19A, that is, on the side where the emission angle is larger than the emission angle range 19A, and the emission angle ranges from the third angle value A3 (A3> A2) to the fourth angle value A4. The range (A3 to A4) up to (A4> A3) is set.

  The reflection surface 21 </ b> C receives light emitted from the light source 2 to the predetermined radiation angle range 19 </ b> C, reflects the light on the inner surface, and converts it into parallel light along the optical axis 3. The radiation angle range 19C is set outside the radiation angle range 19B, that is, on the side where the radiation angle is larger than the radiation angle range 19B. The radiation angle ranges from the fifth angle value A5 (A5> A4) to the sixth angle value A6. The range (A5 to A6) up to (A6> A5) is set. The fifth angle value A5 is substantially equal to the fourth angle value A4 and is substantially orthogonal to the optical axis 3, and the sixth angle value A6 is an angle that forms an obtuse angle with respect to the optical axis 3. .

  The reflecting surface 21D is located on the inner side of the reflecting surface 21A with respect to the optical axis 3, receives light radiated from the light source 2 to the predetermined radiation angle range 19D, reflects the inner surface, and is parallel light along the optical axis 3. Convert to The radiation angle range 19D is outside the radiation angle range 19A and inside the radiation angle range 19B, and is set between the radiation angle ranges 19A and 19B adjacent to both the radiation angle ranges 19A and 19B. The radiation angle is set in a range (A2 to A3) from the second angle value A2 to the third angle value A3.

  The reflective surface 21C is located outside the reflective surface 21B with respect to the optical axis 3, the reflective surface 21B is located outside the reflective surface 21A with respect to the optical axis 3, and the reflective surface 21A is the optical axis 3 Is located outside the reflecting surface 21D. That is, the focal length of the parabolic shape of the reflecting surface 21C is set to be larger than the focal length of the parabolic shape of the reflecting surface 21B, and the focal length of the parabolic shape of the reflecting surface 21B is the same as that of the reflecting surface 21A. The focal length of the parabolic shape of the reflecting surface 21A is set to be larger than the focal length of the parabolic shape of the reflecting surface 21D.

  The lens unit 18 and the reflecting surfaces 21A, 21B, 21C, and 21D are arranged so as not to overlap each other when viewed in the radial direction from the light source position 11, and also overlap each other when viewed from the direction along the optical axis 3. Arranged not to. Accordingly, the reflecting surfaces 21A, 21B, 21C, and 21D do not block the reflected light from each other, and the lens unit 18 does not refract the reflected light from the reflecting surfaces 21A, 21B, 21C, and 21D.

  A part of the reflecting surface 21B and the reflecting surface 21D are arranged so as to overlap each other when viewed from a direction orthogonal to the optical axis 3. This contributes to miniaturization in the direction along the optical axis 3. In order to obtain this effect, at least a part of at least two of the reflecting surfaces 21A, 21B, 21C, and 21D may be disposed so as to overlap each other when viewed from a direction orthogonal to the optical axis 3.

  Flat surfaces 22 and 23 are provided in an intermediate portion in the direction along the optical axis 3 on the outer periphery of the condenser 4. Further, the end surface 20 of the other end portion 10 of the condenser 4 is surrounded by a large-diameter side edge 24 as one edge of the reflecting surface 21 </ b> A, and is formed on an annular flat surface perpendicular to the optical axis 3. ing. These end surfaces 20 and flat surfaces 22 and 23 function as light emission surfaces. The flat surface 22 is formed so as to connect the small-diameter side edge 25 as one edge of the reflective surface 21A and the large-diameter side edge 26 as one edge of the reflective surface 21B, and is perpendicular to the optical axis 3. Extending in the direction. The flat surface 23 is formed so as to connect between a small-diameter side edge 27 as one edge of the reflective surface 21B and a large-diameter side edge 28 as one edge of the reflective surface 21C, and is perpendicular to the optical axis 3. Extending in the direction.

  In the condenser 4, the inside functions as an optical path from the incident surface to the exit surface. Of the radiated light from the light source 2, the light radiated at a radiation angle within the central radiation angle range 19 enters the condenser 4 from the second spherical surface portion 16, passes through the lens portion 18, and passes through the optical axis 3. It is converted into parallel light parallel to the light and emitted forward. Light emitted from the light source 2 at an emission angle within the emission angle range 19A enters the condenser 4 from the second spherical surface portion 16, is totally reflected by the reflecting surface 21A, and is parallel light parallel to the optical axis 3. And is emitted forward through the end face 20. Light emitted from the light source 2 at an emission angle within the emission angle range 19D enters the condenser 4 from the second spherical surface portion 16, is totally reflected by the reflecting surface 21D, and is parallel light parallel to the optical axis 3. And is emitted forward through the end face 20. Light emitted from the light source 2 at an emission angle in the emission angle range 19B enters the inside of the condenser 4 from the first spherical surface portion 14, is totally reflected by the reflection surface 21B, and is parallel light parallel to the optical axis 3. And is emitted forward through the flat surface 22. Light emitted from the light source 2 at an emission angle in the emission angle range 19C enters the condenser 4 from the first spherical surface portion 14 or the cylindrical surface 13a, is totally reflected by the reflection surface 21C, and is incident on the optical axis 3. It is converted into parallel parallel light and emitted forward through the flat surface 23.

  As described above, according to the present embodiment, the condenser 4 includes the reflecting surface 21A as the first reflecting surface having the parabolic shape and the second reflecting surface having the parabolic shape located outside the reflecting surface 21A. And a reflecting surface 21D as a parabolic third reflecting surface located inside the reflecting surface 21A. A plurality of different paraboloid shapes can be used for the reflecting surfaces 21A, 21B, and 21D, the degree of freedom in designing the concentrator 4 can be increased, and the concentrator 4 can be reduced in size and light utilization efficiency can be improved. Can be planned. This effect can be obtained without reducing the size of the light source 2.

In the present embodiment, the length of the reflecting surface 21A in the direction along the optical axis 3 can be set to about half that of a conventional reflecting surface having a single parabolic shape, and the concentrator 4 is markedly separated. Light can be used in a radiation angle range that is approximately half of the omnidirectional direction.
Further, in the present embodiment, light having a large emission angle is received by the reflection surface 21B as the second outer reflection surface, and the reflection angle 21A as the first reflection surface located inside the second reflection surface has a radiation angle. I try to receive a small light. Thereby, the reflecting surface 21A which tends to be enlarged can be disposed close to the optical axis 3 so that light emitted in a wide area can be received in a small area, and the size can be reduced while improving the light utilization efficiency. . Further, even when the reflecting surface 21A is disposed close to the light source 2, the reflecting surface 21B can be provided outside the reflecting surface 21A so as to avoid the light source 2, and light in both emission angle ranges 19A and 19B is used. Thus, the utilization efficiency of light from the light source 2 can be further enhanced. Further, since the reflecting surface 21D is used together with the reflecting surfaces 21A and 21B and can be small in size, even if it is arranged on the innermost side and arranged close to the light source 2, it can be arranged without any interference with the light source 2. It becomes possible.

Further, the apparent size of the light from the light source 2 in the emitted light can be ensured by the plurality of reflecting surfaces 21A, 21B, and 21D arranged along the direction orthogonal to the optical axis 3.
In particular, when the reflecting surface 21B as the outer second reflecting surface is arranged on the side of the light source 2, that is, on the outer side of the light source 2 along the direction perpendicular to the optical axis 3, the inner first reflecting surface. The reflecting surface 21 </ b> A as a surface can be made closer to the light source 2 and miniaturized, and the condenser 4 can be effectively miniaturized in the direction along the optical axis 3.

By arranging a plurality of, for example, two, more preferably three or more reflecting surfaces 21A, 21B, and 21C on the outer periphery of the light collector 4 in order on the outside, the maximum value of the wall thickness for each portion of the translucent member For example, it can be suppressed to about half of the conventional one, and the change in the thickness can also be suppressed. Therefore, for example, the occurrence of molding defects during resin molding can be suppressed, and a translucent member can be easily formed.
In the present embodiment, the reflecting surface 21A as the first reflecting surface is located outside the reflecting surface 21D as the third reflecting surface, and the reflecting surface 21B as the second reflecting surface is located outside the reflecting surface 21D. The third radiation angle range of the surface (corresponding to the radiation angle range 19D) is on the side where the radiation angle is larger than the first radiation angle range (corresponding to the radiation angle range 19A) of the first reflecting surface and the first. The radiation angle is set to be smaller than the second radiation angle range (equivalent to the radiation angle range 19B) of the two reflecting surfaces. In this case, among the three reflecting surfaces 21A, 21B, and 21D, the innermost small reflecting surface 21D can supplement both the reflecting surfaces 21A and 21B on the outside. Therefore, the light use efficiency can be further enhanced.

  Further, by forming the reflecting surface 21D as the third reflecting surface by the projecting portion 15 projecting into the light source accommodating recess 13, the empty space of the light source accommodating recess 13 is effectively used, and the reflecting surface 21D is formed in this space. Can be placed without difficulty. Moreover, if it is the protrusion part 15, it is not necessary to reduce the thickness of a translucent member locally, and generation | occurrence | production of a strength reduction can be suppressed. Moreover, generation | occurrence | production of the shaping | molding defect of a translucent member can be suppressed because the protrusion part 15 contains a slope.

Further, by providing the reflecting surface 21C as the fourth reflecting surface located outside of any of the first reflecting surface, the second reflecting surface, and the third reflecting surface described above, the light utilization efficiency can be further improved. it can.
Further, the lens unit 18 can convert the light in the central emission angle range 19 into parallel light, can further improve the light use efficiency, and can be small in size.

  In the condenser 4, the reflecting surface 21 </ b> D is opened in the direction along the optical axis 3, and a plurality of, for example, two, for example, two depressions 33 formed between the three reflecting surfaces 21 </ b> A, 21 </ b> B, 21 </ b> C are provided. In the direction crossing the optical axis 3, for example, the side away from the optical axis 3 in the orthogonal direction, it is opened. In this case, for example, the reflecting surface 21 </ b> D can be molded with a first mold (not shown) that is die-cut in a direction parallel to the optical axis 3. Since the flat surface 22 is formed perpendicular to the optical axis 3, the reflecting surface 21 </ b> A and the flat surface 22 can be molded by a second molding die (not shown) that is die-cut in a direction perpendicular to the optical axis 3. it can. Further, since the flat surface 23 is formed along a plane perpendicular to the optical axis 3, the reflecting surface 21B and the flat surface 23 can be formed by the above-described second mold. Further, the reflecting surface 21C can be formed by any one of the first and second forming molds described above.

  Thus, for example, a part of the four reflecting surfaces 21A, 21B, 21C, and 21D (corresponding to the reflecting surface 21D) and the remaining reflecting surfaces (the reflecting surfaces 21A and 21B correspond). ) With the first and second molds different from each other in the direction in which the drawing directions intersect with each other, and the degree of freedom in the layout of the part of the reflecting surfaces and the remaining reflecting surfaces is increased. Therefore, it is preferable to reduce the size while increasing the light use efficiency.

  This is because when a reflecting surface is formed by using only a mold having a single pulling direction, a space necessary to configure the mold, for example, a wall thickness to ensure strength. Since a reflecting surface cannot be formed on a portion that needs to be formed, the distance between a plurality of reflecting surfaces is increased. As a result, the mold, and thus the collector, is likely to be enlarged. On the other hand, as in this embodiment, when molding with a plurality of molding dies having different drawing directions, more preferably, when molding with a plurality of molding dies having different cutting directions, Even if it is a space necessary for configuring the mold in the molding die and a space where the molding surface cannot be formed with the molding die, the reflecting surface can be formed using the other molding die. This is because a plurality of reflecting surfaces can be arranged close to each other.

Further, the flat surfaces 22 and 23 and the end surface 20 perpendicular to the optical axis 3 can be suppressed to the minimum that light passing through them is refracted or reflected from the inner surface, which is preferable for improving the light utilization efficiency.
The concentrator 4 preferably includes at least two of the lens portion 18, the reflective surface 21 </ b> A, the reflective surface 21 </ b> B, the reflective surface 21 </ b> C, the reflective surface 21 </ b> D, and the light source housing recess 13, more preferably in the present embodiment. In this way, an integrally molded product in which everything is integrally formed is included. Thereby, the number of parts can be reduced. Further, the integrated portions can be aligned with each other with high accuracy, which is preferable for obtaining parallel light.

Further, the reflection surface 21A directly receives the radiated light from the light source 2 and emits it forward as it is so that the number of times the light is reflected inside the condenser 4 is only one. Thereby, the loss by reflection of light can be suppressed. The same applies to the reflective surfaces 21B, 21C, and 21D.
Since the light source device 1 includes the light source 2 and the above-described concentrator 4 for condensing the light from the light source 2, the light source device 1 having a high use efficiency of the light from the light source 2 can be obtained. realizable.

As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form. In the following description, differences from the above-described embodiment will be mainly described, description of similar configurations will be omitted, and in the case of illustration, the same reference numerals are given to corresponding parts.
For example, in the above-described embodiment, the radiation angle ranges 19B and 19C corresponding to the reflecting surfaces 21B and 21C are set apart from each other, but may be set adjacent to each other. When they are set adjacent to each other, the light use efficiency can be further enhanced. Specifically, the fourth angle value A4 that is the maximum radiation angle in the radiation angle range 19B and the fifth angle value A5 that is the minimum radiation angle in the radiation angle range 19C are set to an equal value, for example, 90 degrees. Conceivable.

Moreover, in each above-mentioned embodiment, although three reflective surfaces 21A, 21B, and 21C were provided in the outer periphery, it is not limited to this. For example, the outer peripheral reflection surface may be four or more, or two, or a plurality of reflection surfaces may be provided inside the light source housing recess 13 so that the outer peripheral reflection surface of the condenser 4 is one. Good.
For example, referring to FIG. 2, light source device 1 </ b> A is different from light source device 1 described above in that it includes a condenser 4 </ b> A instead of condenser 4. The light collector 4A is provided with a reflective surface 21E instead of the reflective surfaces 21B and 21C. The flat surface 22 is formed so as to connect the small-diameter side edge 25 of the reflective surface 21A and the large-diameter side edge 26A as one edge of the reflective surface 21E.

  The reflective surface 21E is formed by extending the above-described reflective surface 21B toward the side closer to the optical axis 3, and the corresponding radiation angle range 19E is set wider outward than the radiation angle range 19B of the reflective surface 21B. Has been. That is, the radiation angle range 19E is set adjacent to the outside of the radiation angle range 19D, and the radiation angle is set to a range (A3 to A5) from the third angle value A3 to the fifth angle value A5.

The lens unit 18 and the reflecting surfaces 21A, 21B, and 21E are arranged so as not to overlap each other when viewed in the radial direction from the light source position 11, and do not overlap each other when viewed from the direction along the optical axis 3. Placed in.
The concentrator 4A includes a reflective surface 21A as a first reflective surface, a reflective surface 21E as a second reflective surface, and a reflective surface 21D as a third reflective surface. Use efficiency can be increased.

  Further, in each of the above-described embodiments, the radiation angle range 19D corresponding to the reflection surface 21D as the third reflection surface is, for example, condensing between the two radiation angle ranges corresponding to the first and second reflection surfaces. In the device 4, it is set between the radiation angle ranges 19A and 19B, but is not limited to this. For example, the third radiation angle range of the third reflection surface is outside the second radiation angle range of the second reflection surface, or inside the first radiation angle range of the first reflection surface as in the following embodiment. May be set.

In the reference example shown in FIG. 3 , the light source device 1 </ b> B is different from the light source device 1 described above in that it includes a light collector 4 </ b> B instead of the light collector 4. The condenser 4B includes a lens unit 29 and a plurality of, for example, three reflecting surfaces 21G, 21H, and 21J.
The concentrator 4B also includes a reflective surface 21H as the first reflective surface, a reflective surface 21J as the second reflective surface, and a reflective surface 21G as the third reflective surface. Can improve the efficiency of use.

  In particular, in the condenser 4B, the lens portion 29 is provided at a position overlapping the light source housing recess 13 in the direction along the optical axis 3. That is, the innermost portion 13 b of the light source housing recess 13 is located farther from the light source position 11 in the direction along the optical axis 3 than the tip of the convex curved surface 29 a of the lens portion 29. As a result, the lens unit 29 can be reduced in size while maintaining the size of the corresponding central emission angle range 19F, and as a result, the degree of freedom in layout of the reflecting surface 21G adjacent to the lens unit 29 can be increased. ing. Further, at least a part of the reflecting surface 21H as the first reflecting surface and the reflecting surface 21G as the third reflecting surface is arranged so as to overlap each other when viewed from a direction orthogonal to the direction along the optical axis 3. Yes. Thereby, the radiation angle range 19G of the reflective surface 21G as the third radiation angle range corresponding to the third reflection surface is inside the radiation angle range 19H as the first radiation angle range, and further, the central radiation angle range. The radiation angle range is outside 19F.

  In this case, since the reflection of light in the radiation angle range with a small radiation angle can be handled by the reflective surface 21G as the third reflective surface arranged close to the optical axis 3, the reflective surface 21H as the first reflective surface is provided. It can be downsized. As a result, the first to third reflecting surfaces 21G, 21H, and 21J can be laid out in a well-balanced manner, which is preferable for reducing the size of the condenser 4B, particularly in the direction along the optical axis 3. Moreover, the apparent size of the emitted light can be ensured by the plurality of reflecting surfaces 21G, 21H, and 21J.

  Specifically, the central emission angle range 19F of the lens unit 29 is different from the central emission angle range 19 of the lens unit 18, and the lens unit 29 is different from the lens unit 18 in this respect. The central emission angle range 19F is set to a predetermined angle range on both sides of the optical axis 3. For example, on one side, the range of the emission angle value from 0 degree to the seventh angle value A7 (A7> 0) (0 to 0). A7) is set. The lens unit 29 has a convex curved surface 29a that functions in the same manner as the convex curved surface 18a.

Each of the reflecting surfaces 21G, 21H, and 21J receives light emitted from the light source 2 to a corresponding predetermined radiation angle range 19G, 19H, and 19J and reflects the light internally.
A plurality of, for example, two reflecting surfaces 21H and 21J are formed on the outer periphery of the condenser 4B. Further, the remaining reflecting surface 21 </ b> G is formed by the inclined surface 17 of the protruding portion 15 in the light source housing recess 13. The reflective surfaces 21G, 21H, and 21J function in substantially the same manner as the reflective surfaces 21D, 21A, and 21E of the condenser 4A, respectively, but the radiation angle range 19G of the reflective surface 21G is different from the radiation angle range 19D of the reflective surface 21D. The radiation angle range 19H of the reflective surface 21H is different from the radiation angle range 19A of the reflective surface 21A, and the radiation angle range 19J of the reflective surface 21J is different from the radiation angle range 19B of the reflective surface 21B.

  The radiation angle range 19G of the reflective surface 21G is set between the central radiation angle range 19F of the lens unit 29 and the radiation angle range 19H of the reflective surface 21H, and is set adjacent to the outside of the central radiation angle range 19F. It is set adjacent to the inside of the radiation angle range 19H, and the radiation angle is set to a range (A7 to A8) from the seventh angle value A7 to the eighth angle value A8 (A8> A7). In the radiation angle range 19H, the radiation angle is set to a range (A8 to A9) from the eighth angle value A8 to the ninth angle value A9 (A9> A8). The radiation angle range 19J is set outside the radiation angle range 19H, and the radiation angle is in a range (A10 to A11) from the tenth angle value A10 (A10> A9) to the eleventh angle value A11 (A11> A10). Is set.

  The reflecting surface 21J is located outside the reflecting surface 21H with respect to the optical axis 3, and the reflecting surface 21H is located outside the reflecting surface 21G with respect to the optical axis 3. The lens unit 29 and the reflecting surfaces 21G, 21H, and 21J are arranged so as not to overlap each other when viewed in the radial direction from the light source position 11, and do not overlap each other when viewed from the direction along the optical axis 3. Placed in.

A flat surface 30 that functions in the same manner as the above-described flat surface 22 is provided at an intermediate portion in the direction along the optical axis 3 on the outer periphery of the condenser 4B. The flat surface 30 is formed so as to connect between a small-diameter side edge 31 as one edge of the reflecting surface 21H and a large-diameter side edge 32 as one edge of the reflecting surface 21J, and is perpendicular to the optical axis 3. Extending in the direction.
In the light collector 4B, the reflecting surface 21G is opened in the direction along the optical axis 3, and the recess 33 formed between the plurality of reflecting surfaces 21H and 21J is crossed with the optical axis 3, for example, orthogonal. It is made to open | release to the side away from the optical axis 3 of the direction to do. In this case, for example, the reflection surface 21G can be formed using a first mold whose extraction direction is along the optical axis 3, and the reflection surface 21H is orthogonal to the optical axis 3. The second molding die that is the direction can be used for molding, and the reflective surface 21J can be molded using any of the first and second molding die described above. Thus, a plurality of, for example, a part of the three reflecting surfaces 21G, 21H, and 21J (the reflecting surface 21G corresponds) and the remaining reflecting surfaces (the reflecting surface 21H corresponds). It is possible to mold with different first and second molding dies whose extraction directions intersect each other, which is preferable for reducing the size while improving the light utilization efficiency.

Note that the concentrator 4B is configured similarly to the reflecting surface 21D of the concentrators 4 and 4A, and receives and reflects light from the light source 2 in a predetermined fourth radiation angle range of the angle values A9 to A10. A reflective surface (not shown) may be provided. Moreover, about this reflective surface, the modified example mentioned later is also considered like reflective surface 21D.
Moreover, in each above-mentioned embodiment and reference example , although reflective surface 21D, 21G was formed by the protrusion part 15, it is not limited to this, For example, inside the light source accommodation recessed part 13 of a translucent member It is also conceivable to form a recess (not shown) such as an annular groove to be formed.

In each of the above-described embodiments and reference examples , the lens portions 18 and 29 have a function of transmitting light from the light source 2 and converting it into parallel light along the optical axis 3, but the present invention is not limited to this. . For example, instead of the lens portions 18 and 29, a lens portion (not shown) having a function of refracting transmitted light toward a direction inclined at a predetermined angle with respect to the optical axis 3 may be provided. It is also conceivable to eliminate the lens unit and the lens units 18 and 29.

Moreover, in the above-mentioned embodiment and reference example , the focal position of each paraboloid shape was made to correspond to the light source position 11, but it is not limited to this. For example, it is conceivable to make the focal position substantially coincident with the light source position 11 within a predetermined range including the focal position and the vicinity of the focal position.
Further, each of the reflection surfaces 21A, 21B, 21C, 21D, 21E, 21G, 21H, and 21J described above is not limited to a rotational paraboloid shape, for example, a shape that forms a cross-sectional parabolic shape and extends in a predetermined direction, for example, The cross section perpendicular to the longitudinal direction may be formed in a bowl-shaped surface having a parabolic shape, or may be formed in a substantially parabolic shape. The substantially parabolic shape includes a concave curved surface shape that approximates a parabolic shape that can convert light from the light source 2 into substantially parallel light along the optical axis 3.

An aluminum vapor deposition film as a total reflection member for totally reflecting light on at least a part of at least one of the reflection surfaces 21A, 21B, 21C, 21D, 21E, 21G, 21H, and 21J of each of the above-described embodiments and reference examples. It may be provided. In this case, the translucent member also functions as a carrier for the aluminum vapor deposition film.
In the light collector 4 shown in FIG. 1, the flat surface 22 is formed perpendicular to the optical axis 3, but the present invention is not limited to this. For example, it is conceivable that the flat surface 22 is inclined with respect to the direction along the optical axis 3 so that the reflected light from the reflective surface 21B can be transmitted through the corresponding flat surface 22. Similarly, it is conceivable that the flat surface 23 is inclined with respect to the direction along the optical axis 3 so that the reflected light from the reflective surface 21C can be transmitted through the flat surface 23. It is also conceivable that the flat surface 22 of the condenser 4A and the flat surface 30 of the condenser 4B are similarly inclined. Moreover, although each concentrator 4, 4A, 4B had the hollow 33, it is also considered that the hollow 33 is abolished.

In addition to LEDs, for example, a light source such as a neon tube can be used as the light source 2 of each of the above-described embodiments and reference examples .
In each of the above-described embodiments and reference examples , the collectors 4, 4 </ b> A, 4 </ b> B interpose the printed wiring board 5 in connection with the light source 2, but the invention is not limited to this, for example, the light source 2 is embedded. It is also conceivable to connect directly with.

In the above-described embodiments and reference examples , the light source devices 1, 1A, 1B including the light source 2 and the condensers 4, 4A, 4B have been described. However, the condensers 4, 4A, 4B described above are separately provided. You may make it comprise a light source device (not shown) by attaching to the provided light source.
In addition to the above-mentioned warning light, the light source device may be used for a display lamp, an illumination device, a signboard, and the like that display information such as characters by a large number of light sources arranged in a matrix. In addition, various design changes can be made within the scope of matters described in the claims.

It is sectional drawing of the light source device of one Embodiment of this invention. It is sectional drawing of the light source device containing the collector of other embodiment of this invention. It is sectional drawing of the light source device containing the collector of a reference example .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 A light source device 2 Light source 3 Optical axis 4, 4 A Condenser 11 Light source position (Focal position of 1st, 2nd and 3rd reflective surface)
13 Light source housing recess 15 Projection 1 8 Lens 18 a Convex curved surface 1 9 Central radiation angle range 19 A Radiation angle range (first radiation angle range)
19B, 19 E Radiation angle range (second radiation angle range)
19 D Radiation Angle Range (Third Radiation Angle Range)
21 A reflective surface (first reflective surface)
21B, 21 E reflecting surface (second reflecting surface)
2 1 D reflective surface (third reflective surface)
2 2 flat surface (a plane perpendicular to the optical axis)
25 Small peripheral edge (one edge of the first reflecting surface)
26, 26A Large-diameter side periphery (one edge of the second reflecting surface)

Claims (5)

A light collector made of a translucent member for condensing light emitted from a light source into parallel light along a predetermined optical axis,
Parallel light that is formed in a substantially parabolic shape having a light source position, which is a position where the light source is to be disposed, substantially in a focal position, and that is emitted from the light source to a predetermined first emission angle range along the optical axis. A first reflective surface that converts to
The light source position is substantially a focal position, and is formed in a substantially paraboloid shape positioned outside the first reflecting surface with respect to the optical axis, and is a predetermined outside of the first radiation angle range from the light source. A second reflecting surface that converts light emitted into the second radiation angle range into parallel light along the optical axis;
The light source position is substantially the focal position, and is formed in a substantially parabolic shape located inside the first reflecting surface with respect to the optical axis, and is emitted from the light source to a predetermined third emission angle range. and a third reflecting surface that converts light into parallel light along the optical axis seen including,
The collector according to claim 3, wherein the third radiation angle range is a radiation angle range between the first radiation angle range and the second radiation angle range . Light source housing recess for housing the light source are formed on the light source position, to claim 1, characterized in that said third reflecting surface is formed by a protrusion protruding to the light source accommodating recess Concentrator as described. The light having a convex curved surface that protrudes in the direction away from the light source position in the vicinity of the optical axis, and the light inside the light source from any of the first radiation angle range, the second radiation angle range, and the third radiation angle range. The concentrator according to claim 1 or 2, further comprising a lens unit that converts light emitted to a predetermined central radiation angle range near the axis into parallel light along the optical axis. Is formed so as to connect between the one edge of one edge and a second reflecting surface of the first reflecting surface, any of claims 1 to 3, characterized by further comprising a flat surface perpendicular to the optical axis Concentrator according to crab. A light source;
A light source device which comprises a collector according to any one of the light from the light source from the first aspect for condensing 4.

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