JP5286098B2 - Lighting - Google Patents

Description

  The present invention relates to an illuminating lamp that irradiates and radiates light emitted from a light source to the outside by a prism surrounding the light source, and particularly used as a sign lamp installed on a runway or a taxiway of an airport. About.

  Conventionally, among these types of lighting lamps, especially as indicator lights installed on airport runways and taxiways, for example, approach lights to indicate the final approach route to the runway, installed on the outer edge of the taxiway There are known taxiway lights for indicating both ends of the taxiway, runway lights for indicating the outline of the runway installed at both ends of the runway, and the like.

  The indicator lamps installed at the airport are irradiated with light based on the predetermined light distribution characteristics around the indicator lamps or in other directions such as directly above or diagonally to inform the position of the road width and shoulder. Light distribution characteristics are required. Specifically, as for a guideway lamp, as a standard regarding the light distribution characteristics, as shown in FIG. 11, when the vertical angle is in the range of 0 degree (horizontal) to 6 degrees, it is 10 compared to the range of 6 degrees to 90 degrees. It was stipulated that the brightness should be set to double.

  In a current taxiway lamp that uses a halogen bulb as a light source, the above-mentioned light distribution characteristic is realized by arranging a Fresnel lens so as to surround the halogen bulb. However, since the halogen bulb has a rated life of about 1000 hours and requires frequent replacement work and high power consumption, a light-emitting diode that can eliminate the disadvantages of halogen bulbs is used as a light source to realize the above-mentioned light distribution characteristics. A beacon has already been proposed.

  For example, the present inventor has already provided a marker lamp that reflects light emitted from a light-emitting diode, which is a light source, to the outside perpendicular to the optical axis by means of a reflective portion having a substantially conical slope shape with the tip opposed to the light source. It has been proposed (see Patent Documents 1 and 2). Here, the reflecting part is a mirror surface in which aluminum is vapor-deposited on the conical surface facing the light emitting diode in the transparent body, or the radiated light has a high density such as a boundary surface between the hollow portion of the transparent body and the outside. When the light is incident on a sparse medium from the medium, total reflection occurs at the boundary surface.

JP 2006-249713 A JP 2006-252841 A

  Each of the marker lamps described in Patent Documents 1 and 2 as described above irradiates light emitted upward by the light emitting diodes in the horizontal direction with the peak angle of the luminous intensity being substantially horizontal and around the optical axis. In this way, the light distribution control is performed to realize the light distribution characteristics shown in FIG. 11, but light reflection is mainly used as a specific means of the light distribution control.

  In the light distribution control by reflection of such light, when the reflection part is formed as a mirror surface, it is necessary to perform aluminum vapor deposition on the transparent body, which is a molded product such as a transparent resin, in short. There is a problem that the manufacturing process becomes excessive and a material different from the transparent body is required, resulting in an increase in cost.

  In addition, when the reflection portion is realized by total reflection, dust and rainwater will stay in the recess portion that forms the boundary surface that causes total reflection, so a glass globe is provided outside to form a double structure. There was a problem that it was necessary. Patent Document 1 also discloses a technique for filling a hollow portion with another transparent body (see paragraph 0048), but it is necessary to combine materials with different densities, which is troublesome in selecting materials and extra. However, there is a problem that the cost increases.

  The present invention has been made paying attention to the problems of the prior art as described above, and has a light intensity peak in a substantially horizontal direction and can irradiate the entire periphery, and is an optical component that is the main part of the optical component. It is possible to mold the lamp with only one material, and it can be easily manufactured by simplifying the structure, the cost can be reduced, and the overall size can be reduced by omitting the outer cover. It is intended to provide.

The gist of the present invention for achieving the above-described object resides in the following items.
[ 1 ] In the illuminating lamp (10) for irradiating the light emitted from the light source (20) by refracting the light by the prism (21) surrounding the light source (20).
The prism (21) includes a hollow portion (22) for housing the light source (20) in a state of surrounding the light source (20), and an outer wall portion (23) formed into a convex lens shape without a downward depression. Prepared,
The prism (21) has a predetermined angle centered on the optical axis where the light source (20) overlaps the central axis of the prism (21) over the entire circumference centered on the central axis extending in the vertical direction. The light radiated to the range is incident from the inner surface on the tip side of the hollow portion (22) , bent so as to be diffused more than the predetermined angle range, and from the outer surface around the top end of the outer wall portion (23). An upper refracting portion (24) that emits light having a substantially uniform intensity distribution with relatively low luminous intensity ;
The light emitted from the light source (20) outside a predetermined angle range centered on the optical axis is incident from an inner surface other than the tip side of the hollow portion (22), and is two-dimensionally narrower than the irradiation range. And converged in a substantially horizontal direction perpendicular to the optical axis from the outer surface on the outer peripheral edge side from the periphery of the top end of the outer wall portion (23) to be emitted as light having a relatively high luminous intensity. side refracting portion to (25), characterized as having an irradiation Akirato (10).

[ 2 ] The illumination lamp (10) according to [1 ], wherein the prism (21) itself also serves as an external cover for protecting the light source (20).

[3] The light source (20) is described, wherein the amount of light is one of light emitting diodes having a light characteristic of attenuating [1] or [2] in accordance with the emission angle from the optical axis away Lighting (10).

[ 4 ] A control circuit (33) that performs dimming to match the luminance in the light characteristics of the bulb when the same value of current is input according to the value of the current input to the light emitting diode as the light source (20). )When,
The illuminating lamp (10) according to [ 3 ], further comprising: a selector switch (34) capable of previously setting a value of a current input to the light emitting diode with respect to the control circuit (33).

The present invention operates as follows.
According to the illuminating lamp (10) described in [1], the light emitted from the light source (20) is refracted and irradiated to the outside by the prism (21), but the prism (21) irradiates the light source (20). A hollow part (22) for housing is provided, and the light source (20) is housed in a surrounding state. And since the outer wall part (23) which comprises the surface of a prism (21) is shape | molded by the convex lens shape without a downward dent, it can prevent that a dust and rain water remain on the surface.

Thereby, as described in the above [ 2 ], the prism (21) can be configured so as to also serve as an external cover for protecting the light source (20). That is, the external cover and the prism (21) are integrated and it is not necessary to have a double structure in which an external cover is separately provided, and not only the structure is simplified but also the size can be reduced.

  The prism (21) causes the light emitted from the light source (20) around its optical axis to enter from the inner surface of the hollow portion (22) and guides the light to the outer surface of the outer wall portion (23). To converge at least in a radiation direction orthogonal to the optical axis. Accordingly, it is possible to easily realize the light distribution characteristic as shown in FIG. 11 by utilizing the light characteristic of the general light source (20) as it is.

Prism (21) performing such a light distribution control, as described previously SL [1], if identified from its shape, over the whole circumference around the central axis extending in the vertical direction, the upper bent portions (24) and that be molded so as to have a lateral refractive portion (25). The light source (20) here is disposed in the hollow portion (22) in a state where the optical axis thereof overlaps with the central axis of the prism (21).

The upper refracting part (24) is a cross-sectional part from the inner surface on the tip side of the hollow part (22) to the outer surface around the top end of the outer wall part (23), and the light source (20) is centered on the optical axis. Light emitted in a predetermined angle range is incident from the inner surface on the distal end side of the hollow portion (22) , bent to be diffused more than the predetermined angle range, and compared from the outer surface around the top end of the outer wall portion (23). The light is emitted as light having a substantially uniform intensity distribution with low target light intensity. Thereby, the periphery of the optical axis of the light source (20) is illuminated almost uniformly with light having a relatively low luminous intensity.

The side refracting part (25) is a cross-sectional part from the inner surface other than the tip side of the hollow part (22) to the outer surface on the outer peripheral edge side from the periphery of the top end of the outer wall part (23). Light radiated outside a predetermined angle range centered on the axis is incident from the inner surface other than the tip side of the hollow portion (22), and converged into a two-dimensional range narrower than the irradiation range. The light is bent and converged in a substantially horizontal direction orthogonal to the optical axis from the outer surface on the outer peripheral side from the periphery of the top end of the outer wall portion (23), and emitted as light having a relatively high luminous intensity . Thereby, in a general light source (20), even in a low luminous intensity region orthogonal to the optical axis, it is possible to illuminate so that the luminous intensity peak comes.

Further, as described in [ 3 ] above, the light source (20) may be a single light emitting diode having a light characteristic in which the amount of light is attenuated as the radiation angle is separated from the optical axis. This makes it possible to take advantage of the LED characteristics of long life and low power, and it is also easy to obtain as a general light source (20), and light near the optical axis with high luminous intensity is irradiated almost evenly upward, and the optical axis Since the light in the low luminous intensity region with the radiation angle away from the light is converged and irradiated in a substantially horizontal direction, the light distribution characteristic as shown in FIG. 11 can be realized by utilizing the light characteristic of a general LED as it is. .

Furthermore, as described in [ 4 ] above, according to the value of the current input to the light-emitting diode that is the light source (20), it matches the luminance in the light characteristics of the bulb when the same value of current is input. A control circuit (33) for dimming and a changeover switch (34) in which the value of the current input to the light emitting diode can be set in advance for the control circuit (33) may be provided. .

  Thereby, when using any one of a plurality of predetermined rated currents when using the illuminating lamp (10), the changeover switch ( 34) is set. Then, the control circuit (33) performs control so that the light intensity of the light emitting diode matches the luminance in the light characteristic of the light bulb when the same current is input. Can be matched.

  According to the illuminating lamp of the present invention, even when a light-emitting diode is used as a light source, a marker lamp having a light distribution characteristic that emits light so as to have a luminous intensity peak in a substantially horizontal direction orthogonal to the optical axis is realized by a prism. In addition, the optical component (prism) can be molded from only one material, can be easily manufactured by simplifying the structure, and the cost can be reduced.

  In addition, dust and rainwater can be prevented from staying on the surface of the prism, and the prism itself can be configured to also serve as an external cover for protecting the light source. The external cover and the prism are integrated, and a separate external cover is provided. There is no need to provide a double structure, and not only the structure can be further simplified but also the size can be reduced.

It is a vertical end view which shows the end surface which cut | disconnected the center longitudinally in the left side surface of the taxiway light which concerns on the Example of this invention, and abbreviate | omitted the internal mechanism. It is a front view which fractures | ruptures and shows a part of taxiway lamp concerning the Example of this invention. It is a rear view which shows the taxiway lamp which concerns on the Example of this invention. It is a top view which shows the taxiway lamp which concerns on the Example of this invention. It is a graph which shows the optical characteristic of the light emitting diode used with the taxiway light concerning the Example of this invention. It is explanatory drawing which shows the optical path of the light from the light emitting diode which injected into the prism in the guide-path lamp which concerns on the Example of this invention. It is explanatory drawing which shows the detail of the prism in the taxiway lamp concerning the Example of this invention. It is a block diagram which shows the lighting unit of the taxiway lamp which concerns on the Example of this invention. It is a graph which shows the characteristic of the electric current-luminance regarding the light emitting diode used with the taxiway lamp which concerns on the Example of this invention, and the halogen bulb conventionally used. 1 is a block diagram schematically showing an aerial light system constructed at an airport using a taxiway light according to an embodiment of the present invention. It is a graph which shows the light distribution characteristic defined by the international standard regarding the conventional general guideway light.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments representing the present invention will be described below with reference to the drawings.
The illuminating lamp according to the present embodiment irradiates the light emitted from the light source by refracting the light to the outside by the prism surrounding the light source. The case where it is used as a guideway lamp for indicating both ends will be described as an example.

  FIG. 1 is a vertical end view showing an end surface in which the center is cut in the vertical direction on the left side surface of the guideway lamp 10 according to the present embodiment and the internal mechanism is omitted. FIG. 2 is a front view showing a part of the taxiway light 10 in a cutaway manner. FIG. 3 is a rear view of the taxiway lamp 10, and FIG. 4 is a plan view of the taxiway lamp 10. FIG. 6 is an explanatory diagram showing an optical path in the guideway lamp 10.

  As shown in FIGS. 1 to 3, the taxiway lamp 10 is a lamp body 11 constituting a main body part, a mounting base 12 mounted on the upper part of the lamp body 11, and a light source disposed in the center of the mounting base 12. The light emitting diode 20 includes a prism 21 mounted on the mounting base 12 so as to surround the light emitting diode 20, a lower base 13 that is installed on the road surface and supports the lamp body 11, and the like.

  More specifically, the lamp body 11 has a hollow cylindrical shape and is formed of an aluminum alloy or the like. The mount 12 is a lid-like member that closes the upper opening of the lamp body 11, and is also formed of aluminum alloy or the like. The lower pedestal 13 is formed in a cylindrical shape having an outer diameter that fits in the lower opening of the lamp body 11, and a foldable constricted portion 14 is formed in the middle thereof.

  The constricted portion 14 is a structure for preventing the aircraft or the like from being damaged by being broken when the aircraft or the like comes into contact with the taxiway light 10. Further, the lamp body 11 is externally fitted with the lower opening loosely on the upper portion of the lower pedestal 13, and is fixed by a fastening screw 15. By loosening the fastening screw 15, the inclination angle of the lamp body 11 with respect to the lower pedestal 13 can be appropriately adjusted within a certain angle range (for example, ± 4 degrees) with respect to the horizontal plane.

  The light-emitting diode 20 is a general surface-emitting high-luminance blue light-emitting diode. As shown in FIG. 5, the light emitting diode 20 has a light-emission-type optical characteristic in which the amount of light is attenuated as the radiation angle is away from the optical axis, that is, has a peak on the optical axis. The light emitting diode 20 is connected to a lighting unit 30 disposed below the mount 12 shown in FIG. 6 via a cord, and light emission is controlled by a current control circuit 33 in the lighting unit 30 shown in FIG. Although not shown, a power cable or the like connected to the lighting unit 30 passes through the inside of the lower pedestal 13 and extends to the outside from the lower opening.

  The prism 21 that forms the basis of the present invention includes a hollow portion 22 that houses the light-emitting diode 20 in a state of surrounding the light-emitting diode 20 from above, and an outer wall portion 23 that is shaped like a convex lens without a downward dent. Or the like, and is integrally formed of a synthetic resin having transparency. Due to the shape of the prism 21 itself, the light emitted from the light emitting diode 20 around its optical axis is incident from the inner surface of the hollow portion 22, and the light is guided from the outer surface of the outer wall portion 23 to at least the light. Light distribution control is performed such that the light is converged and emitted in a radiation direction (horizontal direction) orthogonal to the axis.

  Specifically, as shown in FIGS. 6 and 7, the prism 21 has a characteristic shape such as an upper refracting portion 24 and a side refracting portion 25 that are continuous over the entire circumference around the central axis extending in the vertical direction. have. The light emitting diode 20 is disposed so that its irradiation center faces the proximal end side opening of the hollow portion 22 of the prism 21, and is housed in the hollow portion 22 with the optical axis A overlapping the central axis of the prism 21. Here, the portion where the light emitting diode 20 enters or emits the light L1 emitted in a predetermined angle range centered on the optical axis is the upper refracting portion 24, and the light L2 emitted outside the predetermined angle range is incident. Or the site | part which radiate | emits becomes the side refraction part 25. FIG.

  That is, the upper refracting portion 24 is a cross-sectional portion that extends from the inner surface on the distal end side of the hollow portion 22 to the outer surface around the top end of the outer wall portion 23, and the light-emitting diode 20 has a predetermined angular range centered on the optical axis A ( The light radiated at ± 30 degrees in FIG. 7 is incident from the inner surface on the tip side of the hollow portion 22, guides the light, and has a substantially uniform intensity distribution from the outer surface around the top end of the outer wall portion 23. Is designed to emit as

  On the other hand, the side refracting portion 25 is a cross-sectional portion from the inner surface other than the distal end side of the hollow portion 22 to the outer surface on the outer peripheral side from the periphery of the top end of the outer wall portion 23, and the light emitting diode 20 is centered on the optical axis A. The light emitted outside the predetermined angle range (± 30 degrees in FIG. 7) is made incident from the inner surface other than the tip side of the hollow portion 22 and guided to the outer peripheral side from the periphery of the top end of the outer wall portion 23. Are designed to converge and exit in a substantially horizontal direction orthogonal to the optical axis A.

  The prism 21 has a truncated cone-shaped base portion 26 that extends further to the outer peripheral side from the lower end of the side refracting portion 25, and the base portion 26 is attached so as to fit on the upper surface side of the mounting base 12. . Three recesses 27 for screwing are formed at equal intervals along the outer periphery of the base portion 26, and each recess 27 is fixed to the mounting base 12 with an attachment screw 28. Such a prism 21 also serves as an external cover for protecting the light emitting diode 20 that is a light source itself.

  As shown in FIG. 8, the lighting unit 30 that performs light emission control of the light emitting diode 20 includes a lightning protection circuit 31 that first receives power and avoids an abnormal voltage caused by lightning, and a rectifier circuit 32 that converts AC power into DC power. In addition to the current control circuit (control circuit) 33 for controlling the light emission of the light emitting diode 20, a changeover switch 34 is provided. The current control circuit 33 here performs dimming to match the luminance in the light characteristics of the light bulb when the same value of current is input according to the value of the current input to the light emitting diode 20 as the light source. Features are included.

  The changeover switch 34 can set the value of the current input to the light emitting diode 20 to the current control circuit 33 in advance. Specifically, for example, when there are two types of rated currents, The control circuit 33 manually switches whether the current is directly supplied to the light emitting diode 20 or is shunted at the three terminals. In this example, the diversion with the three terminals corresponds to the function of performing dimming in the current control circuit 33 described above. The function of performing light control will be described later in detail.

Next, the operation of the taxiway lamp 10 according to the present embodiment will be described.
As shown in FIG. 6, the light L1 radiated by the light emitting diode 20 within a predetermined angle range (± 30 degrees) centered on the optical axis A from the inner surface on the distal end side of the hollow portion 22 to the upper refracting portion 24 (FIG. 6). 7), is bent at an angle corresponding to the incident angle, and is guided into the upper refracting portion 24.

  The light L1 guided into the upper refraction part 24 is bent and emitted from the outer surface around the top end of the outer wall part 23 where the upper refraction part 24 is in contact with the outside into light having a substantially uniform intensity distribution. Thus, the light irradiated to the narrow range near the optical axis A of the light emitting diode 20 is bent into a state of being diffused from the irradiation range, and the light above the guide road lamp 10 as light having a relatively low intensity. Illuminate almost evenly.

  On the other hand, the light L2 emitted from the light emitting diode 20 outside the predetermined angle range centered on the optical axis A is incident on the side refracting portion 25 (see FIG. 7) from the inner surface other than the distal end side of the hollow portion 22. Then, the light is bent at an angle corresponding to the incident angle and guided into the side refracting portion 25.

  The light L2 guided into the side refracting portion 25 is directed in a substantially horizontal direction perpendicular to the optical axis A from the outer surface on the outer peripheral side from the periphery of the top end of the outer wall portion 23 where the side refracting portion 25 contacts the outside. The light is emitted in a converged state. Thus, the light irradiated to a wide range excluding the vicinity of the optical axis A of the light emitting diode 20 is bent into a two-dimensional range narrower than the irradiation range, and has a relatively light intensity. Illuminate the horizontal direction over the entire circumference of the taxiway lamp 10 as high light.

  By using the prism 21 as described above, the guide road lamp 10 can realize the light distribution characteristic as shown in FIG. 11 by utilizing the general light characteristic of the light emitting diode 20 as it is. In addition, by adopting the light emitting diode 20 instead of the halogen light bulb, which is a conventional general light source, it has a long life, extremely high visibility and brightness, and it is not thermally and discharge light emission, so the turn-on / off time is fast, It goes without saying that the characteristics of the LED such as low power consumption and excellent impact resistance can be utilized because of high photoelectric conversion efficiency.

  Furthermore, since the outer wall portion 23 forming the surface of the prism 21 is formed in a convex lens shape having no downward dent, it is possible to prevent dust and rainwater from staying on the surface. Thereby, the prism 21 can be configured so as to also serve as an external cover for protecting the light emitting diode 20 itself. That is, it is not necessary to have a double structure in which the external cover and the prism 21 are integrated and a separate external cover (so-called glass globe) is provided, and not only the structure is simplified but also the size can be reduced.

Next, an air lighting system using the taxiway lamp 10 will be briefly described.
FIG. 10 is a block diagram illustrating an example of an airlight system constructed at an airport. The aviation light system has an illumination circuit using a series lighting system, and one of a number of rubber mold transformers (hereinafter referred to as “rubber transformers”) 41 is used as a high-voltage circuit using the constant current regulator 40 as a power source. The secondary side is wired, and the lighting unit 30 of the taxiway lamp 10 is connected to the secondary side of each rubber transformer 41. According to such a system, even if one of the taxiway lights 10 is disconnected, the other taxiway lights 10 are normally lit and the same luminous intensity is obtained.

  In general, an aviation lamp has a rated current of 6.6 A and is defined by international standards. The light is appropriately adjusted and turned on according to changes in the background brightness and weather visibility such as weather and day and night. The taxiway lamp is operated with three taps of 6.6A, 5.2A, and 4.8A, but in practice, fixed operation at 5.2A is common. In consideration of such a situation, for example, regarding the lighting of the taxiway lamp 10, it is conceivable that the approval inspection and the product inspection are used at a rated current of 6.6 A and in actual operation at 5.2 A.

  By the way, the conventional taxiway lamp is generally configured using a 30 W halogen bulb as a light source. However, by using an LED as the light source as in the present invention, power consumption is about 3 W. As a result, the power consumption is reduced, but the conventional rated current of 6.6 A is too large. In fact, 1/10 of 0.66 A is sufficient.

  Therefore, when the power input to the guideway lamp 10 is 0.66 A, the adjustment ratio of the rubber transformer 41 may be changed from the conventional 1: 1 to 1:10. In addition, when the rubber transformer 41 cannot be replaced in the existing modification, the input current is 1: 1, so that it is necessary to reduce the current at the taxiway lamp 10. Therefore, it is necessary to provide a 1:10 current transformer in the taxiway lamp 10 (lighting unit 30).

  Next, a method for realizing rated lighting and dimming (operation) lighting in the guideway lamp 10 will be described. FIG. 9 is a graph showing current-luminance characteristics regarding the halogen bulb and the light emitting diode 20. As shown in the drawing, the current-brightness characteristic of a halogen bulb as a light source for a taxiway lamp is generally expressed in a quadratic curve, whereas the light-emitting diode 20 has a linear characteristic, so it is expressed linearly. Is done.

  When the rated current is 6.6 A (0.66 A) and the light quantity is 100%, in the case of a halogen bulb, the light quantity is 5.2% (0.52 A). In order to maintain the relationship in such a conventional halogen bulb, it is necessary to control the dimming so that the light emitting diode 20 also receives a light amount of 25% when receiving 5.2 A (0.52 A). .

  Therefore, as described above, when the rated current of 6.6 A is used at the time of approval inspection or product inspection, the current control circuit 33 is switched in accordance with this and the current is directly supplied from the current control circuit 33 to the light emitting diode 20. Set to flow. On the other hand, when using at a rated current of 5.2 A in actual operation, the current control circuit 33 is switched in accordance with this and adjusted to match the luminance in the light characteristics of the halogen bulb when the same current is input. It is good to do light. Specifically, it is conceivable to split the current at three terminals by switching the current control circuit 33.

  Thus, when using any one of a plurality of predetermined rated currents when the taxiway light 10 is used, the changeover switch 34 is set according to the current actually used. Then, the current control circuit 33 performs control so that the light intensity of the light emitting diode 20 matches the luminance in the light characteristic of the light bulb when the same current is input, so that the light distribution characteristic standard defined for the light bulb is met. Can do. Note that lights other than taxiway lights such as approach lights and runway lights are operated with modulatable light, so the switch method cannot be applied, and a circuit for detecting current and automatically dimming is required.

  The embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the present invention can be modified or added without departing from the scope of the present invention. included. For example, although one light emitting diode 20 is used as a light source, other types of light sources may be adopted as long as they have the same optical characteristics as those in FIG.

  In the above-described embodiment, the illumination lamp is described as the airport guideway light 10, but the use of the illumination light is not limited to the use as an airline light such as the taxiway light 10, and various vehicle traffic signs, as well as vehicle rotation. The present invention can also be widely applied to general lighting for illuminating lights and landscapes.

  As a light source, it is suitable to use not only a light bulb but also a light emitting diode, and it is possible to realize an illuminating lamp having a light distribution characteristic that emits light so as to have a light intensity peak in a substantially horizontal direction perpendicular to the optical axis by a prism. In particular, it is excellent in use as a marker lamp installed on a runway or taxiway at an airport.

DESCRIPTION OF SYMBOLS 10 ... Taxiway lamp 11 ... Lamp body 12 ... Mounting stand 13 ... Lower base 14 ... Constriction part 15 ... Fastening screw 20 ... Light emitting diode 21 ... Prism 22 ... Hollow part 23 ... Outer wall part 24 ... Upper refraction part 25 ... Side refraction part 26 ... Base part 27 ... Recess 28 ... Mounting screw 30 ... Lighting unit 31 ... Lightning protection circuit 32 ... Rectifier circuit 33 ... Current control circuit 34 ... Changeover switch 40 ... Constant current regulator 41 ... Rubber transformer

Claims (4)

In an illumination lamp that irradiates and irradiates light emitted from a light source with a prism surrounding the light source.
The prism includes a hollow portion that houses the light source in a state of surrounding the light source, and an outer wall portion that is shaped like a convex lens without a downward dent,
The prism has, as its shape, the light emitted from the light source in a predetermined angle range centered on the optical axis overlapping the central axis of the prism over the entire circumference centering on the central axis extending in the vertical direction. The light is incident from the inner surface on the distal end side of the portion , bent to a state diffused beyond the predetermined angle range , and emitted from the outer surface around the top end of the outer wall portion as light having a substantially uniform intensity distribution with a relatively low luminous intensity. An upper refractive part,
The light emitted from the light source to the outside of a predetermined angle range centered on the optical axis is incident from the inner surface other than the tip side of the hollow portion, and is converged to a two-dimensional range narrower than the irradiation range. A side refracting portion that is bent in a bent state and converges in a substantially horizontal direction orthogonal to the optical axis from the outer surface on the outer peripheral side from the periphery of the top end of the outer wall portion, and emits light having a relatively high luminous intensity. it shall be the feature of the irradiation Akirato. The illumination lamp according to claim 1, wherein the prism also serves as an external cover that protects the light source. Wherein the light source, illumination light according to claim 1 or 2 characterized in that it is a single light emitting diode having a light characteristic of light intensity is attenuated in accordance with the emission angle from the optical axis away. In accordance with the value of the current input to the light-emitting diode that is the light source, a control circuit that performs dimming to match the luminance in the light characteristics of the bulb when the same value of current is input;
The illuminating lamp according to claim 3 , further comprising: a change-over switch that can set a value of a current input to the light-emitting diode to the control circuit in advance.

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