JP5417620B2 - Elliptical irradiation projector - Google Patents

Description

  The present invention relates to an elliptical illumination projector, and in particular, the present invention relates to an elliptical illumination projector that can efficiently illuminate an illuminated surface perpendicular to a lens optical axis such as a highway or a stage with an elliptical outline from the front.

  As a conventional spotlight using an LED as a light source, as shown in Japanese Patent Application Laid-Open No. 2007-52957 (Patent Document 1), an LED formed by arranging a plurality of LEDs in parallel and irradiating light emitted from each LED forward An array unit, an array lens that irradiates the light flux emitted from the LED array unit in parallel light, a condensing lens that collects the light that has passed through the array lens and collects the virtual focus, and the virtual focus An irradiation angle control lens that controls the irradiation angle of the light that has passed and irradiates the irradiated surface, and a lamp body that holds the LED array portion, the array lens, the condenser lens, and the irradiation angle control lens at appropriate positions. LED spotlights with are well known.

  In this conventional example, an irradiation surface perpendicular to the lens optical axis is mainly processed as shown in FIG. Since it is a spotlight that irradiates with a spot with a perfect circular contour, the perfect circular contour light beam cannot be converted into an elliptical contour light beam as it is, and therefore, as shown in paragraph 0033 and FIG. By limiting with an aperture plate 61 (light-shielding plate with an elliptical hole) and converting the above-mentioned perfectly circular contour light beam into an elliptical contour light beam having a long diameter within the diameter, the illuminated surface can be spot-irradiated with an elliptical contour from the front. Yes.

  That is, in this conventional example, a light-shielding portion is generated by the aperture plate between the circumference of the short circle portion of the perfect circle irradiation contour and the elliptical irradiation contour. Since the irradiation elliptical light flux increases with flattening, the folding irradiation light flux is greatly reduced at the light-shielding portion, which is extremely uneconomical, and the desired irradiation site is efficiently spotted with the elliptical contour light flux. There is a fundamental and serious problem that lighting cannot be performed.

  Furthermore, in the above conventional example, since the irradiation angle control lens is provided at a portion where the circular light beam outside the light output side focal point of the condensing lens gradually weakens, the overall length becomes long and the usability is poor. To brightly illuminate the surface to be illuminated, which is perpendicular to the optical axis of the lens, which is relatively far from about 15 m, each lens has a long focal length, a bright, large aperture and heavy weight lens. It must be neatly installed on a long and heavy lamp like a cannon.

  Moreover, since the LED array part in the conventional example needs to have a large area, a large power, and a large amount of light corresponding to the increase in the diameter of each lens, this time, the power consumption of the LED light source / LED array part, etc. The heat radiation of the LED becomes a big problem, and the spotlight as a whole also has a fundamental and serious problem that is incompatible with each other, which is larger and heavier and more expensive.

JP 2007-52957 A

  The object of the present invention is to eliminate the waste of the elliptical contour irradiation light in the conventional example and to illuminate the relatively far irradiated surface with the elliptical contour efficiently, so that the direct light of the LED light source is within the focal length on the light receiving side. By installing a plano-convex Fresnel lens and a linear Fresnel lens within the focal length of the light exited close to the plano-convex lens that receives the light at the same axis, the perfect circular contour light beam becomes an elliptical contour light beam with a shorter minor axis and a larger major axis. To provide a short and light elliptical illumination projector that eliminates waste of irradiation light by converting without loss of light quantity and can efficiently spot-illuminate the illuminated surface perpendicular to the lens optical axis far away from the front with an elliptical contour. There is.

  The object of the present invention described above is to provide a plano-convex lens for receiving the direct light of the LED light source fixed at the center of the front surface of the heat radiating body at the center of the optical axis within the light receiving side focal length in a coaxially parallel manner on the inner cylinder covering the heat radiating body A plano-convex Fresnel lens for converting a perfect circular contour light beam within the focal length on the light exit side close to the plano-convex lens into an elliptical contour light beam and a linear Fresnel lens are provided close to each other and coaxially provided on the outer tube covering the inner tube. By converting the perfect circular contour light beam into an elliptical contour light beam whose minor axis is smaller than the diameter and whose major axis is larger, the illuminated surface perpendicular to the lens optical axis can be spot-illuminated from the front with an elliptical contour. I was able to achieve it. In addition, a large number of elliptical illumination projectors according to the present invention can be used as road illumination lamps by installing them in a case of a general highway illumination lamp currently in use so as to be able to project light in the direction of the route at a predetermined attachment angle. Also good.

  According to the present invention, a plano-convex Fresnel lens that converts a perfect circular contour light beam within a light-emitting side focal length close to a plano-convex lens that receives direct light from an LED light source within the light-receiving side focal length at the center of the optical axis into an elliptical contour light beam. And a linear Fresnel lens are placed close to each other and coaxially parallel to the light source and the plano-convex lens. Each lens can convert the irradiation center beam of the long-diameter beam to a wide range, and has an excellent effect that the illuminated surface perpendicular to the lens optical axis can be efficiently spot illuminated from the front with an elliptical contour. .

  In other words, after preventing the excessive diffusion of the irradiated light beam with the plano-convex Fresnel lens, and converting the perfect circular contour light beam into an elliptical contour light beam, the short diameter of the true circular contour light beam is smaller than its diameter by the linear Fresnel lens. It can be converted into an elliptical contour light beam with a large major axis without loss of light quantity, and the perfect circular contour light beam can be narrowed to the vicinity of the short axis of the desired elliptical irradiation contour, and the perfect circular contour light beam is made larger than its diameter according to the narrowing amount. Because it can bulge, it can convert a perfect circular contour light beam into an elliptical contour light beam without loss of light quantity, and with each of these lenses, it can be converted to wide while expanding the central part of the irradiated light beam in the elliptical major axis direction, and there is no wide light loss With an excellent elliptical contour light beam, there is an excellent effect that an illuminated surface perpendicular to the lens optical axis can be efficiently spot-illuminated from the front with an elliptical contour.

  Therefore, according to the present invention, there is no need for an aperture plate (a light shielding plate with an elliptical hole) that greatly wastes the irradiated light beam, and there is no waste of the irradiated light beam. Irradiation with a plano-convex Fresnel lens with an ellipse irradiation contour with a major axis of about 4 m and a minor axis of about 2 m on the surface to be irradiated, which is about 10 to 15 m away from the LED light source and perpendicular to the irradiation optical axis. There is also an excellent effect of brightly illuminating from the front while widening the central width of the major axis of the luminous flux.

  An elliptical illumination projector according to the present invention is provided with the plano-convex lens coaxially parallel to an inner cylinder covered with a heat dissipating body, while the plano-convex Fresnel lens and linear Fresnel lens are provided coaxially and parallel to an outer cylinder. By simply covering and fixing the inner tube to the inner cylinder, the alignment relationship between the LED light source and each of the lenses can be secured at an appropriate position. Therefore, the positioning operation of each member is extremely simple and extremely easy to manufacture. Can be gradually reduced.

  Moreover, since the plano-convex Fresnel lens and the linear Fresnel lens in the elliptical illumination projector according to the present invention can be configured close to the plano-convex lens, respectively, the overall size can be reduced to a short size and light weight, and there is also an excellent effect that the usability is extremely good. . Further, according to the invention of claim 2 of the present invention, the plurality of projectors are installed in the case of the road illumination lamp so as to be able to project light in the route direction at a predetermined downward mounting angle, respectively. From the height of the meter, the irradiated surface such as the road surface is long in the direction of the road with an elliptical irradiation contour of about 20m in the major axis and about 10m in the minor axis, is short in the shoulder and on the opposite lane, and is about the same as a 480W mercury lamp. It was possible to project brightly with an average illuminance of 1, that is, an average illuminance of about 15 lux.

The central part cutting top view of the elliptical irradiation projector by this invention Exploded perspective view of an elliptical illumination projector according to the present invention Optical path explanatory diagram of an elliptical illumination projector according to the present invention Illustrated illustration of irradiation contour of elliptical irradiation projector according to the present invention Perspective view of an elliptical illumination projector according to the invention Live-action projection diagram of an elliptical illumination projector according to the present invention Horizontal illuminance distribution diagram of elliptical illumination projector according to the present invention Vertical illuminance distribution diagram of an elliptical illumination projector according to the present invention Longitudinal side view showing an example of opening a glove of a road light The perspective view which shows an example of the light projector attachment member by this invention Longitudinal side view showing an example in the middle of mounting a large number of projectors of the present invention in a case Longitudinal side view showing an example of mounting a large number of projectors of the present invention in a case A longitudinal side view showing an example of a road illumination lamp using the present invention The perspective view which shows an example of the road illuminating lamp using this invention

  Next, an embodiment of an elliptical illumination projector according to the present invention will be described with reference to the drawings. An LED having a well-known colorless and transparent dome lens as shown in FIGS. 1 and 2 that emits light forward as a narrow-angle diffuse direct light. The terminal board 1A on which the light source 1 is mounted is fixed to the center portion of the front surface (bottom surface) 2A of the heat radiating body 2 formed, for example, in a round bowl shape through the heat conducting plate 1B so as to be thermally conductive with male screws n as shown in FIG. As shown in FIG. 3, a plano-convex lens 3 having a mounting flange as shown in FIG. 2 is provided for receiving the narrow-angle direct light of the light source 1 on the plane side around the lens optical axis Lo within the light receiving side focal length. .

  As shown in FIG. 1, the plano-convex lens 3 is coaxially parallel to the stop edge 4A as shown in FIG. 1, and is attached to the opening edge screw hole 4B of the cylindrical inner cylinder 4 as shown in FIG. 3 and 4 is converted into an elliptical contour light beam L2 without loss of light quantity, as shown in FIGS. 3 and 4 within the focal length of the light exit side close to the convex surface 3A of the plano-convex lens 3. For this purpose, a well-known plano-convex Fresnel lens 5 as shown in FIG. 2 and a circular contour linear Fresnel lens 6 obtained by circularly cutting a currently used square linear Fresnel lens are prepared.

  The plano-convex Fresnel lens 5 and the linear Fresnel lens 6 are superposed coaxially or parallel to each other as shown in FIG. 1 or close to each other so that the attachment ring 7C is inserted into the screw hole 7B of the opening edge 7A of the outer cylinder 7 as shown in FIG. After attaching the male screw n as shown in FIG. 1, the outer cylinder 7 is coaxially parallel to the inner cylinder 4 as shown in FIG. 1, with the lenses 5 and 6 approaching the convex surface 3A of the plano-convex lens 3. Then, the elliptical irradiation projector A according to the present invention as shown in FIGS. 1 and 5 was constructed by screwing and fixing them with male screws n.

  When the narrow-angle diffuse direct light from the light source 1 is incident on the light-receiving plane of the plano-convex lens as shown in FIG. The direct convex light is narrowed down to a perfect circular contour light beam L1 as shown in FIG. 4 which diffuses slightly, and the plano-convex Fresnel lens 5 disposed close to the light-projecting convex surface 3A of the plano-convex lens 3 and mainly a linear Fresnel lens 6 Then, the perfect circular contour light beam L1 can be converted into an elliptical contour light beam L2 having a shorter minor axis and a larger major diameter than the diameter without loss of light quantity. From the elliptical irradiation projector A according to the present invention, as shown in FIG. The irradiated surface B perpendicular to the lens optical axis Lo, which is about 5 m away, was brightly irradiated with an elliptical irradiation contour C having a major axis of about 4 m and a minor axis of about 2 m. Although the elliptical irradiation contour C is clearly expressed by a solid line in FIG. 6, the elliptical irradiation contour C gradually darkens as it goes outward. Does not exist.

  That is, in the elliptical illumination projector A according to the present invention, the plano-convex Fresnel lens 5 prevents excessive diffusion of the irradiated light beam, and then the linear Fresnel lens 6 causes the perfect circular contour light beam L1 to have a smaller minor axis and a larger major axis. It can be converted into an elliptical contour light beam L2 as shown in FIG. 4 without loss of light quantity, and the perfect circular contour light beam L1 can be narrowed down to the vicinity of the minor axis of the desired elliptical irradiation contour, and the perfect circular contour light beam L1 according to this narrowing amount. Can be swelled larger than its diameter, so that the perfect circular contour light beam L1 is converted into the elliptical contour light beam L2 with no loss of light amount, and the center portion of the irradiated light beam is widened in the elliptical major axis direction by these lenses 5 and 6. This is a wide elliptical contour light beam L2 with no light loss, and the lens optical axis is about 13.5 m away from the elliptical illumination projector A (LED light source 1) according to the present invention as shown in FIG. The irradiated surface B of the vertical made brightly illuminated with maximum illuminance about 18 lux an elliptical irradiation contour portion C of the order of diameter of about 4m · short diameter of about 2m from the front.

  However, as the LED light source 1 in the present invention, four LEDs of a power type white LED (required power: 1.25 watts, brightness: 125 lumens) manufactured by Cree USA are arranged in parallel on the terminal board in a square shape. A commercially available LED light source 1 in which a transparent dome lens is covered and fixed to an LED element having a total required power of 5 watts and a total brightness of 500 lumens is used.

  The plano-convex lens 3 is an ordinary aspheric plano-convex lens having a thickness of 16.7 mm, a diameter of 50 mm, and a focal length of about 27 mm. The distance from the light output portion of the LED light source 1 to the light receiving plane 3A of the plano-convex lens 3 is 15 mm. It was.

  Further, the plano-convex Fresnel lens 5 has a maximum thickness of 1.5 mm, a minimum thickness of about 1.2 mm, and a 65 mm diameter transparent acrylic resin made of an extremely flat and convex convex disc. A common plano-convex Fresnel lens 5 having a focal length of about 65 mm having a large number of concentric grooves 5A having a maximum depth of 0.7 mm, the central side of which is almost vertical and the outside is gradually thinned in the thickness direction, is used.

  The linear Fresnel lens 6 has a maximum depth of 0.7 mm on a very flat ridge-like convex surface of a transparent acrylic resin with a maximum thickness of about 1.9 mm and a minimum thickness of about 1.5 mm. The tip of the LED light source 1 is formed by using a circular contour linear Fresnel lens 6 formed by cutting a general linear linear Fresnel lens (cylindrical lens) having a large number of parallel straight grooves 6A into a disk shape having a diameter of about 65 mm. An elliptical illuminating projector A according to the present invention in which the distance from the front surface to the front surface (light-emitting surface) of the linear Fresnel lens 6 was 35 mm was manufactured.

  The prototype ellipse irradiation projector A is connected to a known rated power source and is lit. The distance from the LED mounting surface to the irradiated surface B is 13.5 m as shown in FIG. An irradiation experiment was carried out under the elliptical contour irradiation conditions with a major axis of about 4 m and a minor axis of about 2 m as shown in the three-dimensional irradiation diagram of FIG.

  As a result of measuring the illuminance of the elliptical contour irradiation part C, the central part maximum illuminance is 18.75 lux, and the illuminance range of 50% or more is the elliptical irradiation contour of the irradiation part C having a minor axis of about 2 m and a major axis of about 4 m. It was within the range, and the illuminance gradually decreased toward the periphery, but it was confirmed that the illuminance was uniform and there was no uneven illuminance. FIG. 7 shows the illuminance measurement result of the horizontal section passing through the center point of the elliptical contour irradiation part C, and FIG. 8 shows the illuminance measurement result of the vertical section.

  Next, a large number of the elliptical illumination projectors A according to the present invention as described above are respectively mounted in a predetermined downward direction in a lamp body of a general road illumination lamp such as a sodium lamp or a mercury lamp (see, for example, JP-A-7-21809). A description will be given with respect to an embodiment in which an interior is used so as to be able to project light in a long direction in an angle.

  As shown in FIG. 9, the above-mentioned general road lighting is generally transparent and is pivotally supported by a hinge 9 so as to be pivotable downward by a hinge 9 in the vicinity of the opening end of the lamp body 8 having a generally flat and bottom shape. 9 has a square glove-shaped locking collar 12 between the opposing protrusions 11A of the attachment piece 11 as shown in FIG. 9 fixed to the other end of the glove. The other end is provided with a pull lever 13.

  In this general road illumination lamp, when the vicinity of the tip of the pull lever 13 is pulled in the direction indicated by the arrow in FIG. 9, the hook 12 rotates in the direction indicated by the arrow with the pivot 12A as a fulcrum. When the door 13 is released, the rod 12 is a self-returning force of elasticity such as a vine spring provided on the shaft of the pivot 12A, and a road having a general glove opening and closing structure that is restored to its original state as shown by the solid line in FIG. In the present invention, an illumination lamp (not shown) such as a mercury lamp in the lamp body 8 is removed from the socket 8A, and the lamp body reflecting plate (not shown) is also removed.

  Next, in the present invention, an attachment member 14 made of a tough material such as metal having a hypotenuse 14A that rises obliquely at a predetermined angle from the four sides of the eccentric square box as shown in FIG. 10 is prepared. As shown in FIG. 1, the ellipse irradiation projector A according to the present invention projects into the center of the rear surface of the radiator 2 in a total of 16 mounting holes 14B provided in a balanced manner in a plurality as shown in FIG. By inserting the fixed male screw n and screwing it with the nut N, for example, a total of 16 projectors A are provided on the mounting member 14 in order with a predetermined downward mounting angle as shown in FIG.

  Then, a hook hole 15B is formed on the front oblique side 15A of the strong lamp mounting plate 15 that is firmly placed along the inner surface of the top plate of the lamp body 8 of the road lighting lamp as shown in FIGS. On the other hand, a hook-like hooking piece 14D having a letter-like shape protruding from the front oblique side 14A of the attachment member 14 having the total of 16 projectors A to the outside of the vertical side 14C raised as shown in FIG. As shown in FIG. 11, the attachment member 14 is tilted and inserted into the hooking hole 15B to be cantilevered. Then, the rear portion of the attachment member 14 is rotated in the direction of the arrow in FIG. The upper surface 14F of the oblique rising side 14E at the rear part of the attachment member 14 is brought into close contact with the attachment plate 15 and screwed to the attachment plate 15 with screws n passed through the screw holes 14G as shown in FIG.

  Next, the globe 10 is pivoted back upward as shown in FIG. 13 with the hinge 9 as a fulcrum and is put on the opening of the lamp body 8. In this case, this force is applied immediately before the globe 10 is completely covered. First, while the hook slant side 12B slides on the side edge of the locking protrusion 16 projecting on the lamp body side, the hook piece 12 resists its self-returning force, and the pivot lever 12A serves as a fulcrum together with the pulling lever 13. It rotates in the direction indicated by the arrow in FIG.

  Thereafter, when the hook slant side 12B passes through the side edge of the locking protrusion 16 and is disengaged from the upper end thereof, the locking hook piece 12 uses the self-returning force together with the pull lever 13 as a fulcrum 12A in FIG. The glove 10 can be attached to and held on the lamp body 8 because the hook 12 is engaged with the upper end of the locking protrusion 16 as shown in FIG. As shown in FIG. 14, many of the elliptical illumination projectors A according to the present invention can be installed in the road illumination lamp body 8. In addition, the part shown with the code | symbol 14H in FIG. 10 is a driver insertion hole.

  Next, at the time of inspection or replacement of the elliptical illumination projector A or the like, the pulling lever 13 is pivoted against the self-returning force of the locking piece 12 when opening the globe 10 by rotating it downward from the lamp body 8. By pulling in the direction indicated by the arrow in FIG. 13 with the support 12A as a fulcrum, the locking collar 12 rotates in the direction indicated by the arrow in FIG. 13, and the collar 12 disengages from the upper edge of the locking protrusion 16. Therefore, the globe 10 can be opened by rotating downward from the lamp body 8 as shown in FIG.

  And the said road illumination lamp body which equipped the said total 16 light projectors A is attached to the upper part of the road illumination light pole of the roadside so that downward projection is possible by a known means, and a total of 16 each ellipse irradiation By supplying power from the socket 8A of the lamp body 8 to the power circuit board corresponding to the power consumption 5W × 16 = 80W of the projector A, a total of 16 elliptical irradiation projectors A can be used to increase the speed from a height of 13.5 meters. The illuminated surface B such as a road surface has an elliptical irradiation contour with a major axis of about 20 m and a minor axis of about 10 m, is long in the direction of the road, is short in the direction of the shoulder and on the opposite lane, and has an average illuminance comparable to a 480 W mercury lamp. It was able to project brightly with an average illuminance of about 15 looks.

  The elliptical irradiation projector according to the present invention and the elliptical irradiation road illumination lamp equipped with a large number of elliptical irradiation projectors, in addition to the road lighting, respectively, can be used for, for example, television studios, various exhibition halls, and a wide area to be used in general such as a stage. It can also be used as an elliptical illumination projector that illuminates wide from the front with an elliptical contour beam.

DESCRIPTION OF SYMBOLS 1 ... LED light source 2 ... Radiating body 3 ... Plano-convex lens 4 ... Inner cylinder 5 ... Plano-convex Fresnel lens 6 ... Linear Fresnel lens 7 ... Outer cylinder 8 ... Lamp body 9 of road lighting lamp ... Hinge 10 ... Globe 11 ... Attachment piece DESCRIPTION OF SYMBOLS 12 ... Locking lever piece 13 ... Pull lever 14 ... Mounting member 15 ... Mounting plate 16 ... Locking protrusion A ... Ellipse irradiation projector B ... Illuminated surface C ... Ellipse irradiation outline Lo ... Lens optical axis L1 ... True circular contour beam L2 ... Ellipse contour beam

Claims (2)

  A plano-convex lens that receives the direct light of the LED light source fixed at the center of the front surface of the heat radiating member at the center of the optical axis within the focal length on the light receiving side is provided coaxially and parallel to the inner cylinder that covers the heat radiating member, and the light emitted close to the plano-convex lens By providing a plano-convex Fresnel lens and a linear Fresnel lens, which convert a perfectly circular contour light beam within a side focal length into an elliptical contour light beam, close to each other and provided coaxially and parallel to the outer cylinder over the inner cylinder, the perfect circular contour light beam Is converted into an elliptical contour light beam whose minor axis is smaller than its diameter and the major axis is large, and the illuminated surface perpendicular to the lens optical axis can be spot illuminated with an elliptical contour from the front with this elliptical contour light beam. Irradiation projector.   A plano-convex lens that receives the direct light of the LED light source fixed at the center of the front surface of the heat radiating member at the center of the optical axis within the focal length on the light receiving side is provided coaxially and parallel to the inner cylinder that covers the heat radiating member, and the light emitted close to the plano-convex lens By providing a plano-convex Fresnel lens and a linear Fresnel lens, which convert a perfectly circular contour light beam within a side focal length into an elliptical contour light beam, close to each other and provided coaxially and parallel to the outer cylinder over the inner cylinder, the perfect circular contour light beam Is converted into an elliptical contour light beam whose minor axis is smaller than its diameter and the major axis is large, and a number of elliptical illumination projectors that enable spot illumination of the illuminated surface perpendicular to the lens optical axis with an elliptical contour from the front with this elliptical contour light beam. An elliptical illumination projector characterized in that the projector is prepared and is installed in a lamp body of a road illuminator so as to be able to project light in the direction of the route at a predetermined downward mounting angle.

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