JP2014116093A - Light-emitting unit for use in lighting fixture and flashlight using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a light-emitting unit, by a simple structure, which allows emission of light diffused in surroundings of the light-emitting unit simultaneously with light projected in one direction by one lighting fixture while using a light source mainly having directivity in one direction, and provides a freedom in a layout of the lighting fixture according to usage while taking a distribution of the light into consideration, in order to solve a problem that it has been necessary hitherto to always prepare two kinds of lighting fixtures of a light collecting type and a light diffusing type, desirably, for coping with a disaster.SOLUTION: The nearest side of the light source is covered with a light source cover which becomes thinner as extending in the main oriented direction of the light source, or extending substantially in parallel with the main oriented direction. Light collecting means with a size substantially covering an opening of the light source cover at the side of the main oriented direction of the light source is arranged adjacent to the opening. The allocation of light projected to one direction through the light collecting means and light diffused to a circumferential wide range of the light emitting unit through the light source cover is adjustable by varying the size of a diameter of the light collecting means viewed from the light source, the wideness/narrowness of the directivity angle peculiar to the light source, or the length of the light source cover from the light source toward the light collecting means.

Description

  The present invention relates to a light emitting unit that can be used in a lighting device such as a portable light or a projector, or a portable light using the light emitting unit.

  Conventionally, lighting fixtures such as portable electric lamps and projectors are used to collect light from a light source and throw light in one direction far away, and to illuminate and diffuse light for the purpose of illuminating a wide area around the desk or indoors. It is roughly divided into things that are devised to diffuse. In recent years, due to the heightened awareness of disaster prevention, demand for luminaires in both concentrating and diffused forms is increasing due to the assumption of various usage scenes of the luminaires when emergency blame is required or during a power failure. . For example, when escaping from a disaster site, it is necessary to irradiate brightly in front of the walking direction, but at the same time, light that diffuses light over a wide area is also necessary to ensure the safety of the feet of yourself and your companion. In addition, it is desirable to have a safe light that illuminates the surrounding area extensively after evacuation. The user should prepare for the two types of lighting equipments in preparation for an upcoming disaster, and it will impose a burden on the user in terms of cost, the place to place the blame tools, and the increase of luggage during evacuation. It was a thing.

  Concentrating the light from the light source and throwing the light in one direction far away, a convex lens is placed in front of the direction of the light source that has directivity mainly in one direction such as LEDs that are becoming mainstream in recent years. Or, a flashlight that exhibits a light collecting effect by arranging a mortar-shaped reflector around the light source is known. In addition, for diffusing light for the purpose of illuminating a wide area, the directional LED is used as a light source, but the surroundings of the light source are covered with a large colored or satin-like cover to spread the light to the surroundings. Lantern-type portable electric lights are known. In addition, a single product that has a condensing reflector and a diffuser hood that can be moved to switch between condensing and diffused light has been put into practical use. When you switch to diffuse light, there is almost no light in the front, and while maintaining the brightness to ensure safety in front of the walking direction, it is also at your feet and the feet of your companions There was no such thing as shining light widely. In general, the number of parts by the mechanism related to the switching of the diverging light is increased, resulting in an expensive product (for example, Patent Document 1).

JP 2006-210042 A

  In such a conventional lighting fixture, the user should prepare for two types of lighting fixtures, preferably a concentrating type and a scattering type, in preparation for an upcoming disaster. The burden on users was also increased in terms of increasing luggage during evacuation.

  The present invention uses a light source mainly having directivity in one direction, such as an LED, which has recently become mainstream for reasons such as a short lifetime and a long life, and the light from the light source is emitted from a single lighting fixture. It is possible to make a light-emitting part of a lighting fixture that can be used for condensing and projecting light far away in one direction and illuminating a wide range of surroundings at a low cost with a simple structure, making it safe to walk in a disaster The purpose is to increase the safety in the time and provide a wide range of users with easy-to-use lighting fixtures even after refuge.

  In order to solve the above-described problem, a light emitting unit used in a lighting device such as a portable light or a projector according to the first aspect of the invention uses a light source having a main directivity in one direction, and is closest to the light source. The light source cover is covered with a light source cover that becomes thinner or substantially parallel to the main direction of the light source, and is adjacent to the opening of the light source cover on the side of the main light source direction. The condensing means is arranged in a size that almost covers the part, and the diameter of the condensing means as viewed from the light source, the wide and narrow directivity angle of the light source, or the condensing means from the light source of the light source cover Due to the length in the direction, it is possible to adjust the distribution of light projected in one direction through the light collecting means and light scattered through the light source cover to a wide area around the light emitting unit. .

  According to the present invention, light that diffuses in one direction through the light collecting means and light that diffuses around the light emitting section through the light source cover can be emitted, and the design of the lighting fixture can be freely made in consideration of the distribution. With lighting equipment, while ensuring the brightness in the front of the walking direction, it is possible to irradiate diffused light to your feet and to the companion's feet, or to irradiate the surroundings extensively on a tabletop or indoor, depending on the application Irradiation forms can be created. In addition, an inexpensive product can be provided with an extremely simple structure.

  Further, preferably, a collar-shaped member extending from the outer periphery of the opening is provided at the terminal opening of the light source cover on the side opposite to the main directing direction of the light source, and the collar-shaped member is colored or contains a light diffusing agent as in the previous light source cover. Alternatively, when the material surface is processed into a satin finish or the exterior surface is configured as a reflector, the light diffused by the light source cover can be reflected and diffused again toward the outside of the lighting fixture at the widened portion of the collar. it can.

  Further, when the peripheral surface of the light condensing means is formed on the same surface as the light converging means when viewed from the light source, and is configured to be colored or containing a light diffusing agent or a material-finished state, The light diffused by the light source cover can be diffused more widely toward the side of the lighting fixture or the outside below the fixture.

Sectional drawing of the flashlight in Embodiment 1 of this invention Sectional drawing which showed the radiation state of the light of the light emission part in Embodiment 1 of this invention FIG. 6 is a diagram when the diameter of the light collecting means in the second embodiment of the present invention is changed, (a) a diagram when the cylinder portion is extended in parallel so as to contact the side of the light source, (b). A figure when the cylinder part is extended in parallel with a small gap on the side of the light source, (c) A figure in which the cylinder part is arranged so as to be in contact with the side of the light source and becomes narrower in the direction of the light source FIG. 6 is a diagram when the amount of light entering the light converging means is changed due to a difference in directivity angle unique to the light source in Embodiment 3 of the present invention, (a) a diagram when a light source having a narrow directivity angle is employed; FIG. 4 is a diagram when a beam having a slightly wider directivity angle than that in FIG. 4A is employed. FIG. 4C is a diagram when a device having a wider beam angle than that in FIG. 4B is employed. In Embodiment 4 of this invention, it is a figure when changing the length to the light source directing direction of the light source cover surrounding a light source, and changing the light quantity which enters into a condensing means, (a) A light source and a condensing means are separated. FIG. 5B is a diagram when the distance between the light source and the condensing means is closer than that in FIG. 5A, and FIG. 5C is a distance between the light source and the condensing means even closer than in FIG. Illustration when

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a light emitting unit used in a lighting fixture which is an example of an embodiment using the present invention and a flashlight to which the light emitting unit is applied. FIG. 1 shows a combination of a light emitting unit according to the present invention and a battery case part of a general front-projection type flashlight. The battery case 2 is screw-fitted to the light emitting unit 1, and two batteries 3 are housed in series in the battery case 2, a battery spring 4 is arranged on the negative electrode side of the battery 3, and the switch is passed through the battery lead 5. The lead 6 is electrically connected, and on the light emitting part 1 side, a plus terminal 7 is arranged in the center of the surface in contact with the battery case 2, and a minus terminal 8 is arranged circumferentially around the plus terminal 7 and the minus terminal 7 and minus Each terminal 8 is connected to a circuit board 9 disposed in the light emitting unit 1 via a cord 10. When the switch slide 11 is moved in the direction of the light emitting unit 1 and the switch lead 6 touches the negative terminal 8 in conjunction with the switch slide 11, the flashlight is turned on by being supplied with power to the light source 14.

  The light-emitting portion 1 has a circuit board 9 disposed in an outer case 13 made of a light-transmitting material and formed with a screw portion 12 for fitting with the battery case 2, and has a main directivity in one direction. As a light source 14 with a bullet-type LED (light emitting diode), an LED cover 15 is provided so as to cover the circuit board 9 and the light source. The LED cover 15 has a cylindrical portion 15a as a light source cover that is in the immediate side of the light source 14 and extends substantially in parallel with the direction of the light source 14, and a terminal opening on the opposite side of the light source directing direction in the cylindrical portion 15a. It is a funnel-shaped shape integrally formed with the open brim portion 15b.

  The LED cover 15 is made translucent milky white by kneading a small amount of a white pigment or a diffusing agent in a translucent resin material. Alternatively, the surface of the tube portion 15a may be matte finish. The flange portion 15b of the LED cover 15 is provided with the reflecting material 16 by a method such as aluminum deposition or a silver seal attached to the surface. In addition, a translucent front base 17 is disposed on the light source directing direction side of the outer case 13. At the center of the front base 17, a convex lens 17a of the light collecting means is integrally formed adjacent to the opening on the light source directing direction side of the cylindrical portion 15a so as to substantially cover the opening. The peripheral surface 17b of the convex lens 17a is substantially formed as viewed from the light source 14, and the surface is processed into a satin finish. The convex lens 17a and the peripheral surface 17b of the convex lens 17a may be formed of separate parts, and the peripheral surface 17b may be a translucent milky white resin kneaded with a small amount of white pigment or diffusing agent.

FIG. 2 shows a light emission state in the light emitting section in the first embodiment in a cross-sectional view. In FIG. 2, the traveling direction of light is indicated by a two-dot chain line. The light emitted from the light source 14 has a peak of radiation intensity in the direction of the convex lens 17a of the condensing means, and the light entering the diameter range of the convex lens 17a is condensed through the convex lens 17a and is suitable for illuminating the front in one direction. And go out. Light that does not fall within the diameter range of the convex lens 17a can be diffused mainly laterally from the outer wall of the cylindrical portion 15a in a state where the light enters the cylindrical portion 15a and is diffused from the inner wall of the cylindrical portion 15a. At the same time, since the entire side surface of the cylindrical portion 15a extending from the light source 14 toward the convex lens 17a is in a light emitting state that appears bright like a pillar, the light emitting area becomes large and it becomes easier to deliver diffused light to the surroundings and the unit area of the light emitting portion The brightness of the surroundings, that is, the “brightness” represented by cd / m ² is reduced, and even when the light emitting part is directly seen by the eyes, it can be made not dazzling. It is suitable for.

  Further, the collar portion 15b of the LED cover 15 can diffuse and reflect the light diffused by the tube portion 15a again, and can widely irradiate the surroundings with light. At this time, if the reflector 16 is disposed on the surface of the collar portion 15b, light can be emitted to the outside of the light emitting portion more efficiently. In the first embodiment, the flange portion 15b is inclined, but there is no problem even if it is a horizontal plane.

Further, by applying a satin finish or the like to the peripheral surface 17b of the convex lens 17a to impart diffusibility, the light diffused by the cylindrical portion 15a is further diffused uniformly toward the side of the lighting fixture or the outside below the fixture. It is something that can be done. In the flashlight according to the first embodiment, the bottom surface of the battery case 2 is widened so that the battery case 2 can be easily placed vertically on the table. However, when using such a method, particularly from the peripheral surface 17b of the convex lens 17a. The effect that diffused light illuminates the tabletop is obtained. Although not shown, a chip-type LED light source that is mounted on a circuit board and has a wide light directivity angle has a peak of radiation intensity in a direction perpendicular to the circuit board. The structure of the present invention can be applied to a light source having directivity in the direction.

  More specifically, as described in the second and subsequent embodiments, the diameter of the condensing means as viewed from the light source, the wide and narrow directivity angle of the light source, or the light from the light source cover. Depending on the length in the direction of the means, it is possible to adjust the distribution of the light projected in one direction through the light collecting means and the light scattered through the light source cover to a wide area around the light emitting unit.

(Embodiment 2)
FIG. 3 shows an embodiment in which the amount of light entering the condensing means is changed by changing the diameter of the convex lens 17a as the condensing means in the light emitting section according to the present invention. FIG. 3A shows a cylindrical portion 15a that extends in parallel with the direction of the light source so as to be in contact with the side of the light source 14, and a convex lens 17a that is the same size as the cylindrical diameter at the tip opening. FIG. 3 (b) shows a configuration in which a cylindrical portion 15a is extended in parallel with the directing direction of the light source 14 with a slight gap on the side of the light source 14, and a large convex lens 17a is disposed at the tip opening thereof in accordance with the cylinder diameter. In FIG. 3C, the cylindrical portion 15a is arranged so as to be in contact with the side of the light source 14, but the shape becomes narrower toward the direction of the light source 14, and a small convex lens 17a is arranged at the tip opening. Is. In FIG. 3, the light that enters the convex lens 17a is indicated by a two-dot chain line. As described above, when the diameter of the condensing means is changed, the corresponding opening size of the cylindrical portion 15a is also changed so that the light condensing means covers the opening. All are incident on the cylindrical portion 15a and diffused, and are used for scattering without waste.

(Embodiment 3)
FIG. 4 shows an embodiment in which, in the light emitting unit 1 according to the present invention, the amount of light entering the condensing means is changed by the difference in the directivity angle unique to the light source 14. 4 (a), 4 (b), and 4 (c), the cylindrical portion 15a is extended in parallel with the direction of the light source 14 so as to be in contact with the side of the light source 14, and a cylindrical diameter is formed at the tip opening thereof. Although the convex lens 17a of the condensing means is arranged in the same size, FIG. 4A employs a light source 14 having a narrow directivity angle, and the light incident on the convex lens 17a in front of the light source 14 in the directivity direction. A lot. 4 (b) employs a light source 14 having a slightly wider directivity angle than that in FIG. 4 (a), and FIG. 4 (c) provides the light source 14 with a wider directivity angle than in FIG. 4 (b). It is what was adopted. In FIG. 4, the directivity characteristic of the light source 14 is indicated by a two-dot chain line. In this way, by changing the directivity angle of the light source 14, the distribution of the light traveling toward the convex lens 17a of the condensing means and the light diffused by the cylindrical portion 15a can be changed.

(Embodiment 4)
FIG. 5 shows an embodiment in which the length of the cylindrical portion 15a, which is a light source cover surrounding the light source, in the direction of the light source 14 is changed in the light emitting unit 1 according to the present invention. 5A, 5B, and 5C, the size of the convex lens 17a and the opening diameter of the corresponding cylindrical portion 15a are the same, but the distance from the light source 14 to the convex lens 17a is changed. The amount of light traveling toward the convex lens 17a, which is a condensing means, is changed. In FIG. 5, the directivity characteristic of the light source 14 is indicated by a two-dot chain line. Here, the light sources having the same directivity characteristics are used in FIGS. 5 (a), 5 (b), and 5 (c). In the fourth embodiment, the length of the part of the cylinder part 15a is changed. However, the same thing can be said even if the distance from the light source 14 to the convex lens 17a is changed by moving the light source 14 up and down in the cylinder part 15a. It is.

As described above, light that diffuses in one direction through the light collecting means and light that diffuses around the light emitting section through the light source cover can be emitted, and the lighting fixture can be freely designed in consideration of its distribution, so that a single illumination The device can illuminate your feet and the companion's feet with diffused light while ensuring the brightness in front of the walking direction, and can irradiate a wide range of the tabletop and the surroundings of the room, depending on the application Can be produced freely. In addition, it is possible to provide a wide range of consumers with inexpensive lighting equipment products with an extremely simple structure.

  The embodiment of the light emitting unit used in the lighting apparatus according to the present invention has been described as an application example to a portable electric lamp. Since the present invention can freely create an irradiation form according to the application and has a simple structure, it can be widely used for projectors and lighting devices other than portable electric lamps.

DESCRIPTION OF SYMBOLS 1 Light-emitting part 2 Battery case 3 Battery 4 Battery spring 5 Battery lead 6 Switch lead 7 Positive terminal 8 Negative terminal 9 Circuit board 10 Code 11 Switch slide 12 Screw part 13 Exterior case 14 Light source (bullet-shaped LED: light emitting diode)
DESCRIPTION OF SYMBOLS 15 LED cover 15a Tube part 15b Collar part 16 Reflector 17 Front base 17a Convex lens 17b Peripheral surface of convex lens 17a

Claims (3)

Using a light source with main directivity in one direction, cover the immediate side of the light source with a light source cover that narrows as it goes in the main directivity direction of the light source or extends substantially parallel to the main directivity direction,
The light collecting cover is disposed adjacent to the main light source opening direction side of the light source cover and has a size so as to substantially cover the opening, and the diameter of the light collecting means viewed from the light source, Light emitted in one direction through the light collecting means and a wide area around the light emitting unit through the light source cover due to the wide and narrow directivity angle of the light source or the length of the light source cover from the light source to the light collecting means direction. A light-emitting unit used in a lighting device such as a portable light or a projector, and a portable light using the light-emitting unit, characterized in that the distribution of scattered light can be adjusted. A collar-shaped member extending from the outer periphery of the opening is provided at the terminal opening opposite to the main directing direction of the light source of the light source cover,
2. The light emission used in a lighting device such as a portable electric light or a projector according to claim 1, wherein the collar member is colored or contains a light diffusing agent, or has a material-finished surface or a reflective surface. Department and portable electric light using it.   The peripheral surface of the condensing means is formed on the same surface as the condensing means when viewed from the light source, and is colored or filled with a light diffusing agent, or a material-finished surface. A light emitting unit used in a lighting device such as the portable light or projector described in 2-2, and a portable light using the light emitting unit.

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