JP2012054115A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device that uniformly illuminates a whole region of an oblong surface to be irradiated.SOLUTION: The projector device 1 has a light source inside its casing 10, and, while being installed on either an upper or a lower edge side of a planar surface 5 to be irradiated, illuminates the surface 5 to be irradiated with the light source. The light source includes a plurality of LED packages 17. Inside the casing 10, the projector device also includes: a main pedestal section 19 with slopes 30 arranged on both sides of the projector device pressed out towards the surface 5 to be irradiated which have LED packages 17 at both a tip side and a base end side of the slopes 30; reflecting mirrors 40A for long-distance use to distribute light at a long distance in a lateral direction which are arranged in correspondence to either the LED packages 17 on the tip side of the main pedestal section 19 or the LED packages 17 on the base end side of the same; and reflecting mirrors 40B for short-distance use to distribute light at a short distance in a lateral direction, arranged in correspondence to the LED packages on the other side.

Description

  The present invention relates to a projector that is used for light-up lighting, light projection lighting for a signboard or a sign advertisement, and more particularly to a projector that irradiates a horizontally long irradiation surface.

2. Description of the Related Art Conventionally, floodlights that illuminate various signs such as canopy signs, parapet signs, and facade signs, or sign advertisements are known. In general, when the width of a signboard or sign advertisement (hereinafter referred to as “irradiated surface”) exceeds the illuminable range of one projector, a plurality of projectors are arranged along the width of the irradiated surface. The entire surface to be irradiated is illuminated by the projector. However, when the number of projectors increases, there is a problem that the initial cost of the projectors increases and the running cost and power consumption also increase.
On the other hand, in the lighting field, various lighting fixtures that realize a wide light distribution are known (see, for example, Patent Documents 1 to 3).

Japanese Patent Laid-Open No. 06-275112 Japanese Patent Application Laid-Open No. 07-045113 Japanese Patent Laid-Open No. 11-126502

  By the way, when floodlighting a signboard or a sign advertisement, it is desired to uniformly illuminate the entire irradiated surface from a predetermined distance without uneven illuminance. However, the conventional projector does not realize a light distribution suitable for uniformly illuminating a horizontally long irradiated surface, and in the event of uniformly illuminating a horizontally long irradiated surface, eventually, a plurality of projectors are used. It was necessary to illuminate with.

  In particular, when a large signboard surface is illuminated from above or below, conventional signboard lamps are often limited in width from the signboard surface, and the distance from the projector in the vertical direction (2 to 5 times the output width) Since it is difficult to ensure the illuminance of a certain signboard surface, a plurality of projectors are arranged at equal intervals in the horizontal direction while ensuring the illuminance in the vertical direction to ensure the illuminance of the signboard surface. However, small signboards such as parapet signboards and facade signboards have many horizontally long signboard surfaces, and the vertical direction is about 1 to 2 times the output width, while the horizontal direction is about 4 times the output width. Several low W (watt) floodlights were lit side by side, and the illumination rate was low.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a projector that uniformly illuminates the entire area of a horizontally long irradiated surface.

  In order to achieve the above object, the present invention provides a projector having a light source in a housing and disposed on either one of upper and lower sides of a planar irradiated surface and irradiating the irradiated surface with the light source. The light source includes a plurality of LEDs, and the housing has inclined surfaces on both sides protruding toward the irradiated surface, and the LEDs are disposed on the distal end side and the proximal end side of the inclined surfaces, respectively. A pedestal part, a long-distance reflecting mirror that is arranged corresponding to one of the LED on the front end side and the LED on the base end side of the pedestal part and distributes light in a long distance in the horizontal direction, and arranged corresponding to the other And a short-distance reflecting mirror that distributes light in a short distance in the horizontal direction.

  In the projector, the LED disposed on the inclined surface of the pedestal portion is a white LED, and the LED that cancels yellow emitted from a pair of white LEDs is on the LED placement surface intersecting the ridge line of the pedestal portion. It is characterized in that a reflector for controlling light distribution in the ridge line direction is arranged in correspondence with the LED arrangement surface on which the LED that disposes the yellow is arranged.

  Further, the present invention provides a projector for the long-distance reflector and the short-distance reflector so as to suppress the amount of light in a portion where the light that has passed through the long-distance reflector and the light that has passed through the short-distance reflector is overlapped. The roughness of the reflecting surface is changed.

  Moreover, the present invention is characterized in that, in the above projector, the housing includes a globe that covers each LED, and at least a portion of the globe that faces the LED has a curved surface that is continuous without a bending point. .

According to the present invention, a pedestal portion that has inclined surfaces on both sides of the housing that protrude toward the irradiated surface side, and has LEDs disposed on the distal end side and the proximal end side of the inclined surface, and the pedestal portion A long-distance reflecting mirror that is arranged corresponding to one of the LED on the front end side and the LED on the proximal end side and distributes light in a long distance in the horizontal direction, and arranged in a short distance in the horizontal direction corresponding to the other. It was set as the structure provided with the reflective mirror for short distances which light.
With this configuration, it is possible to illuminate the entire surface of the horizontally illuminated surface with light whose light distribution is controlled by the long-distance reflector and the short-distance reflector. In particular, according to the present invention, since the light distribution can be controlled for each LED of the pedestal portion, it is possible to effectively eliminate uneven illuminance on the irradiated surface and uniformly irradiate. Further, in the conventional projector using a lamp as a light source, the illuminance decrease is noticeable at the corners on both sides of the irradiated surface among the four corners of the irradiated surface. The light distribution control of the reflecting mirror can effectively distribute the light to the corners, so that a decrease in illuminance at the corners can be prevented.

It is a side view which shows the external appearance structure of the projector which concerns on embodiment of this invention with a use aspect. It is a front view of a projector main body. It is a figure which shows the structure of an assembly | attachment base, (A) is a front view, (B) shows a side view. It is a figure which shows the state which removed the reflection unit from the projector main body, (A) is a front view of a projector main body, (B) is sectional drawing of a projector main body. It is a figure which shows the structure of a reflection unit, (A) is a front view of a reflection unit, (B) is a side view of a reflection unit. It is A-A 'sectional drawing of Drawing 5 (A). FIG. 6 is a B-B ′ sectional view of FIG. It is a figure which shows the structure of a LED package. It is a figure which shows typically the enlarged light emitting part of an LED package. It is a figure which shows both the front of a globe, a side, a front, and a back. It is a figure which shows the illuminance distribution when the sign advertisement of 1 m in height and 4 m in width is illuminated, (A) shows the illuminance distribution of the projector which concerns on embodiment, (B) shows the illuminance distribution of the conventional projector. It is a figure which shows the modification of the main base part of this invention. It is a figure which shows the other modification of the main base part of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, as an example of a lighting fixture, an advertisement projector suitable for use in sign advertisements and billboard lighting is described.
FIG. 1 is a side view showing an appearance configuration of a projector 1 according to this embodiment together with a usage mode.
The projector 1 has an arm 2 having a predetermined length extending in a rod shape, and a projector main body 3 provided at the tip of the arm 2. The arm 2 is installed in the building where the sign advertisement 4 to be illuminated is installed, and the projector main body 3 is arranged to protrude forward from the upper edge 4U side of the sign advertisement 4 by a predetermined distance. The projector main body 3 illuminates the entire advertising surface (hereinafter referred to as “irradiated surface”) 5 of the sign advertisement 4. Examples of the illuminated surface 5 include a canopy signboard, a parapet signboard, a facade signboard, or various types of advertisements that are long in the lateral direction, in addition to the advertisement surface of the sign advertisement 4. Further, the floodlight main body 3 may be arranged on the lower edge 4D side of the sign advertisement 4 to illuminate the irradiated surface 5 from the lower side of the sign advertisement 4.

FIG. 2 is a front view of the projector body 3.
The projector main body 3 includes a box 10 having a box shape when viewed from the front, and an arm attachment 11 for attaching the casing 10 to the arm 2. The arm attachment 11 is a U-shaped member that sandwiches both sides of the housing 10 and is rotatably attached to the housing 10. The installation angle of the housing 10 with respect to the irradiated surface 5 is adjusted by rotating the housing 10 with respect to the arm attachment 11. In the present embodiment, as shown in FIG. 1, the housing 10 is installed facing the irradiated surface 5 (the swing angle γ (FIG. 11) is zero degree).
The casing 10 is formed by aluminum die casting having excellent thermal conductivity, and an assembly base 60 is detachably provided therein.

3A and 3B are diagrams showing the configuration of the assembly base 60, in which FIG. 3A shows a front view and FIG. 3B shows a side view.
The assembly base 60 is a base body for assembling the power supply unit 18 (see FIG. 4B) and the LED package 17 (see FIG. 4A), and is an aluminum having high thermal conductivity like the housing 10. It is molded by die casting. The rear surface 61 of the assembly base 60 is formed in a shape that is in close contact with the bottom surface of the housing 10. Thereby, the heat of the LED package 17 assembled to the assembly base 60 is transferred from the assembly base 60 to the housing 10 with reduced loss.
As described above, the power supply unit 18 and the LED package 17 are assembled to the assembly base 60 and housed in the housing 10, so that the existing base 60 of the existing projector 1 can be adapted to a desired light output and light distribution. As described above, the performance of the projector 1 can be easily changed by simply replacing the mounting base 60 with the LED package 17 mounted thereon.

  The power supply unit 18 assembled to the assembly base 60 is disposed on the lower base 12 of the housing 10, and the LED package 17 is mounted on the assembly base 60 on the light source unit 13 on the upper side of the housing 10. An assembled light source unit 14 is arranged. An acrylic glove 15 is provided in front of the light source unit 13. The arm attachment 11 is provided so as to sandwich both sides of the base portion 12, and as shown in FIG. 1, when the projector 1 is installed on the upper edge 4U side of the irradiated surface 5, the projector body 3 is turned upside down. The base 12 is installed on the upper side, and the light source unit 13 is installed on the lower side. On the contrary, when the projector 1 is installed on the lower edge 4D side of the irradiated surface 5, the light source unit 13 is installed on the upper side and the base unit 12 is installed on the lower side.

The light source unit 14 emits light to a horizontally long area extending from the front to both sides of the housing 10, and includes a light distribution control reflection unit 16 formed of a material having high reflection characteristics such as aluminum. Yes.
FIG. 4 is a diagram illustrating a state in which the reflection unit 16 is removed from the projector main body 3, FIG. 4A is a front view of the projector main body 3, and FIG. 4B is a cross-sectional view of the projector main body 3. FIG. 5 is a diagram showing the configuration of the reflection unit 16, FIG. 5A is a front view of the reflection unit 16, and FIG. 5B is a side view of the reflection unit 16. 6 shows an AA ′ section in FIG. 5A, and FIG. 7 shows a BB ′ section in FIG.

As shown in FIG. 4B, the side surface of the housing 10 is cut off at each of the upper side 10A, the left side 10B, and the right side 10C of the light source unit 13, and not only the front surface of the light source unit 13, but also the left and right side surfaces and the ceiling. Light is also emitted from the surface.
As shown in FIGS. 4A and 4B, the light source unit 14 includes a plurality of LED packages 17 in a light source, and includes a main pedestal portion 19 and a sub pedestal portion 20 on which the LED packages 17 are arranged. ing. The main pedestal portion 19 and the sub pedestal portion 20 are integrally formed on the assembly base 60 as shown in FIG.

FIG. 8 is a diagram showing the configuration of the LED package 17.
The LED package 17 is a light emitting element module that emits white light in a rectangular plane shape. Specifically, the LED package 17 is formed on an LED substrate 22 having an insulating layer 22B on the surface of a metal plate 22A, and the insulating layer 22B of the LED substrate 22, and 24 × 3 LEDs 23 are arranged in a grid pattern. And a light emitting section 24 having a substantially rectangular shape when viewed from the front, and planar light is emitted from the light emitting section 24 in the normal direction of the LED substrate 22. In the figure, reference numeral 25 denotes an anode electrode formed on the LED substrate 22, and reference numeral 26 denotes a cathode electrode. In the projector 1, an LED package 17 having an output of about 1400 [lm] is used, and the light source of the light source unit 14 is composed of five LED packages 17.

FIG. 9 is a diagram schematically showing the light emitting unit 24 of the LED package 17 in an enlarged manner.
The light emitting unit 24 is configured by sealing the LEDs 23 arranged in a lattice shape with a sealing body 27. The LED 23 is a blue LED that emits blue light. The sealing body 27 is a resin material in which a phosphor that emits yellow fluorescence in response to blue light is dispersed, and covers the LEDs 23 with a uniform thickness. Under such a configuration, when the LED 23 emits light, the sealing body 27 emits yellow fluorescence due to the blue light of the LED 23, and white light is emitted from the light emitting portion 24 to the normal direction of the LED substrate 22 by mixing the blue light and the yellow light. Is emitted in a planar shape with an irradiation direction H.

As shown in FIG. 4, the LED package 17 is attached to each of the main pedestal portion 19 and the sub pedestal portion 20. The main pedestal portion 19 is a long-distance irradiation LED package 17 (hereinafter referred to as a long-distance illumination LED package 17A) that irradiates a long distance of the irradiated surface 5 as viewed from the projector 1, and a short-distance that irradiates a short distance. This is a member to which an LED package 17 for irradiation (hereinafter referred to as an LED package 17B for short distance irradiation) is attached.
Specifically, the main pedestal portion 19 is formed in a symmetrical mountain shape that protrudes in a substantially triangular shape toward the irradiated surface 5 side, and the ridge line is aligned with the center line M of the housing 10 and is inclined on both side surfaces. The surface 30 is provided facing the left and right sides of the housing 10. Further, ceramic plates 31 having high thermal conductivity and insulation are respectively attached to these inclined surfaces 30, and the long-distance irradiation LED package 17 </ b> A on the base end side of the main pedestal portion 19 on the ceramic plates 31. The LED packages 17B for short-distance irradiation are arranged on the tip side.

  The main pedestal portion 19 is formed by aluminum die casting integrally with the housing 10, and thermal resistance between the main pedestal portion 19 and the housing 10 is suppressed. As a result, the heat generated by the long-distance irradiation LED package 17A and the short-distance irradiation LED package 17B is transferred from the main pedestal portion 19 to the housing 10 through the ceramic plate 31 with high thermal conductivity, and efficiently radiated. In addition, the main pedestal portion 19 is not hollow and is formed solid so as to increase the heat capacity.

In the long-distance illumination LED package 17A and the short-distance illumination LED package 17B arranged on the inclined surface 30, the irradiation direction H is covered by the inclination θa of the inclined surface 30 as shown in FIG. It is inclined to the left end side and the right end side of the irradiated surface 5 with respect to the normal direction J of the irradiation surface 5. Thereby, for example, the LED package 17 is arranged on the bottom surface of the light source unit 13 in the same plane, and the irradiation surface 5 is arranged in a face-to-face arrangement so that the irradiation direction H coincides with the normal direction J of the irradiation surface 5. The irradiation is performed over a wide range up to the far left and right, and the width of the irradiated surface 5 that can be irradiated with one lamp can be expanded.
The light emitted from each of the long-distance irradiation LED package 17A and the short-distance irradiation LED package 17B is subjected to light distribution control by the reflection unit 16, and this configuration will be described later.

The sub pedestal portion 20 is a member to which a front irradiation LED package 17 that irradiates the front surface of the irradiated surface 5 (hereinafter, referred to as a front irradiation LED package 17C) is attached.
Specifically, the sub pedestal portion 20 has an LED arrangement surface 32 that is flat in the lateral direction of the front view rectangle, and the LED arrangement surface 32 intersects the ridge line of the main pedestal portion 19 on the upper side of the main pedestal portion 19. The housing 10 is provided so as to be disposed at a position. Then, the ceramic plate 31 having high thermal conductivity and insulation is attached to the LED arrangement surfaces 32, and the front-illuminating LED package 17 </ b> C is arranged on the ceramic plate 31. Similarly to the main pedestal portion 19, the sub pedestal portion 20 is not hollow but is solidly formed by aluminum die casting integrally with the housing 10. Heat generation from the front-illuminating LED package 17 </ b> C is transmitted through the ceramic plate 31 to the sub pedestal portion 20. Thus, heat is efficiently transferred to the housing 10.
As shown in FIG. 7, the front irradiation LED package 17 </ b> C is arranged on the LED arrangement surface 32 of the sub pedestal portion 20, so that the irradiation direction H is arranged in parallel to the normal direction J of the irradiated surface 5. Then, light is irradiated toward the front surface of the irradiated surface 5. Further, the projector 1 is disposed in a right-and-left central portion O of the irradiated surface 5 so that the front irradiation LED package 17C mainly irradiates the central portion O of the irradiated surface 5.

  The inclined surface 30 of the main pedestal portion 19 and the LED arrangement surface 32 of the sub pedestal portion 20 are irradiated at a long distance from the upper edge 4U or the lower edge 4D side of the irradiated surface 5, as shown in FIG. The light of the LED package 17A, the short-distance irradiation LED package 17B, and the front-illumination LED package 17C should be directed to substantially the center of the irradiated surface 5 in the height direction so that the entire area in the height direction can be irradiated. Inclined with respect to the horizontal direction S at a predetermined elevation angle θb.

The reflection unit 16 is formed of, for example, an aluminum plate having high reflection characteristics and covers both the main pedestal portion 19 and the sub pedestal portion 20, the long-distance illumination LED package 17 </ b> A, the short-distance illumination LED package 17 </ b> B, and the front surface By controlling the light distribution of each light of the irradiation LED package 17C, the entire surface of the irradiated surface 5 is illuminated while suppressing unevenness in illuminance.
Specifically, the reflection unit 16 includes a long-distance LED package 17A, a short-distance illumination LED package 17B, and a front-illumination LED package 17C as shown in FIG. A mirror 40A, a short-distance reflecting mirror 40B, and a front reflecting mirror 40C are formed. Each of the long-distance reflecting mirror 40A, the short-distance reflecting mirror 40B, and the front-side reflecting mirror 40C has a shape and a size of the light emitting unit 24 at a position opposed to the LED package 17, as shown in FIGS. A reflecting surface 42 is arranged on each side of a rectangular opening 41 formed together.

As shown in FIG. 6, the long-distance reflecting mirror 40A distributes the light of the long-distance illumination LED package 17A to the long-distance area Da on the left end 4L side or the right end 4R side of the sign advertisement 4 to reflect the short-distance reflection. The mirror 40B controls the light distribution of the short-distance irradiation LED package 17B in the short-distance area Db extending from the long-distance area Da to the central portion O. Further, as shown in FIG. 7, the front reflecting mirror 40C controls the light distribution of the front irradiating LED package 17C to a later-excessive yellow area Dc including the central portion O.
Thus, the long-distance reflecting mirror 40A, the short-distance reflecting mirror 40B, and the front-side reflecting mirror corresponding to the long-distance illumination LED package 17A, the short-distance illumination LED package 17B, and the front-side illumination LED package 17C. By providing the mirror 40C, the light distribution can be controlled independently for each of the long-distance illumination LED package 17A, the short-distance illumination LED package 17B, and the front-side illumination LED package 17C. Can be effectively eliminated to achieve uniform illumination.
In particular, in a conventional projector using a lamp as a light source, illuminance reduction is noticeable at the corners on both sides of the irradiated surface 5 on the side where the projector 1 is disposed. According to the projector 1, The light distribution control of the long-distance reflecting mirror 40A can effectively distribute the light to such a corner, so that a decrease in illuminance at the corner can be prevented.

  Further, since the light distribution control is performed by the long-distance reflecting mirror 40A, the short-distance reflecting mirror 40B, and the front-side reflecting mirror 40C, which are reflective optical systems, the light distribution control is performed by a transmissive optical system such as a lens. Compared with the case, the illuminance unevenness due to chromatic aberration can be suppressed. Further, the long-distance reflecting mirror 40A, the short-distance reflecting mirror 40B, and the front-side reflecting mirror 40C are more easily variable in shape (reflection area and reflection angle) than a transmissive optical system such as a lens. It is possible to easily and accurately control and achieve uniform illumination of the horizontally illuminated surface 5.

Next, the excessive yellow area Dc will be described.
In the configuration of the LED package 17, the light may be biased to yellow at the edge of the light irradiation range. More specifically, since the LED package 17 obtains white light by mixing the blue light of the LED 23 and the yellow light by the fluorescence of the sealing body 27 as described above, the emission color of the LED 23 and the fluorescence of the sealing body 27 are obtained. When the color balance is lost and the fluorescent color component becomes strong, the light obtained by the color mixture is biased to yellow. That is, as shown in FIG. 9, the sealing is performed between the light component K1 going from the LED 23 in the irradiation direction H (normal direction of the LED substrate 22) and the light component K2 going in the oblique direction with respect to the irradiation direction H. Comparing the path lengths L1 and L2 when passing through the stationary body 27, the path length L2 of the light component K2 in the oblique direction becomes longer, and therefore, in the direction of the light component K2, compared to the direction of the light component K1. The fluorescence of the sealing body 27 becomes strong.
When the angle with respect to the irradiation direction H of the LED 23 is α, and the threshold angle that is unbalanced between the emission color of the LED 23 and the fluorescent color of the sealing body 27 and is biased to αth is αth, the path length L increases as the angle α increases. Therefore, light emitted from a range of 180 degrees ≧ threshold angle αth (hereinafter referred to as “fluorescent color excess range β”) is biased to yellow.

On the other hand, in the light source unit 14, as shown in FIG. 6, the long-distance irradiation LED package 17 </ b> A and the short-distance irradiation LED package are formed on the inclined surfaces 30 on both sides of the main pedestal portion 19 protruding in a substantially triangular shape. A light source is configured by arranging 17B. As described above, also in the LED package 17A for long distance irradiation and the LED package 17B for short distance irradiation, the light is biased to yellow in the fluorescent color excess range β that is in the range of 180 degrees ≧ threshold angle αth. 5 causes color unevenness. In particular, in the short distance area Db, since the distance from the projector 1 is short, the excessive yellow area Dc in which the color unevenness caused by the light in the fluorescent color excess range β is conspicuous as compared with the long distance area Da is generated. End up.
Therefore, in the projector 1, the white light of the front-illuminating LED package 17C is distributed to the excessive yellow area Dc by the front reflector 40C, thereby canceling the yellow color of the excessive yellow area Dc and causing uneven color. It is inconspicuous.

By the way, it is formed in a substantially trapezoidal shape in cross section so as to form a flat portion at the apex (ridgeline) of the main pedestal portion 19, and the above-mentioned front-illuminating LED package 17C is arranged on this flat portion, and it is far from the inclined surfaces on both sides. A configuration in which the LED package 17A for distance irradiation and the LED package 17B for short distance irradiation are also conceivable. However, in this configuration, the main pedestal 19 extends in the horizontal direction by the amount of the front-illuminating LED package 17C, and the housing 10 expands in the horizontal direction. At this time, if the lateral expansion of the housing 10 is suppressed, in the long-distance reflecting mirror 40A and the short-distance reflecting mirror 40B, the distance Q (from the rectangular opening 41 corresponding to the bottom of the reflecting mirror to the opening of the tip portion) (See FIG. 6) is limited, so the control angle of light distribution is also limited. In particular, the long-distance reflecting mirror 40A that distributes light to the long-distance area Da requires a large control angle in order to irradiate uniformly including the corners of the long-distance area Da, but the control angle of light distribution is also limited. As a result, the uniformity of the long-distance area Da decreases.
On the other hand, the main pedestal 19 is configured in a triangular shape, and the front illumination LED package 17C is arranged at a position intersecting the ridge line of the main pedestal 19, so that the control angle of the long-distance reflecting mirror 40A is Without being restricted, the long-distance area Da can be uniformly illuminated including the corners.

  In the reflection unit 16, among the reflection surfaces 42 constituting the long-distance reflection mirror 40A and the short-distance reflection mirror 40B, the reflection surface 42 shown by hatching in FIG. Surface processing is performed to change the roughness of the surface, and the reflectance is made lower than that of the other reflecting surfaces 42 due to the change in roughness so that the amount of light can be suppressed. The reflection surface 42 shown by the oblique lines is the light distribution of the long-distance reflecting mirror 40A, the short-distance reflecting mirror 40B, and the front-side reflecting mirror 40C in the long-distance area Da, the short-distance area Db, and the excessively yellow area Dc. The light is distributed to the area where the two overlap. By reducing the regular reflectance of the reflecting surface 42, the illuminance at the overlapping area is suppressed to prevent halation, and the illuminated surface 5 is illuminated with a more uniform illuminance.

FIG. 10 is a view showing the front, side, front, and back of the globe 15 together.
In a conventional projector provided with a lamp as a light source, it is common to protect the heat from the lamp by taking a distance from the lamp by providing a shape with inflection points at various locations on the globe. It is. However, since the inflection point of the globe produces a light condensing function, there is a problem that unevenness in illuminance occurs on the irradiated surface 5 due to the light passing through each of the inflection points.
On the other hand, when the light source is configured by the LED package 17, since the thermal influence on the globe 15 is suppressed more than the lamp, the globe 15 can be brought closer to the LED package 17. For this reason, it is not necessary to provide an inflection point in the surface which transmits the light of the light source unit 14.

That is, in the globe 15, as shown in FIG. 10, the translucent surface 50, which covers at least the LED packages 17 of the reflection unit 16 so as to face each other (shown by hatching in the figure), has a point X as a vertex. By being formed so as to coincide with the peripheral surface of the cone, each line from the point X toward each point of the edge 51 of the globe 15 is linearly inclined, and there is no inflection point. A translucent surface 50 as a curved surface is formed. Thereby, light is not condensed when passing through the light transmitting surface 50, and unevenness in illuminance is reduced, and uniform illumination is possible.
Note that the point X, which is the apex of the cone constituting the light transmitting surface 50, is a surface substantially perpendicular to the irradiation direction H of each LED package 17 of the light source unit 14, as shown in FIG. Is set to a position. Thereby, the reflection at the time of the light of LED package 17 permeate | transmitting the translucent surface 50 is suppressed, and appliance efficiency is improved.

  11A and 11B are diagrams showing the illuminance distribution when the sign advertisement 4 having a height of 1 m and a width of 4 m is illuminated. FIG. 11A shows the illuminance distribution of the projector 1 and FIG. 11B shows the illuminance distribution of the conventional projector 90. Illuminance distribution is shown. The conventional floodlight 90 is a lighting fixture generally used for lighting the sign advertisement 4 of this size, and is a fixture using a 160 W self-ballast mercury lamp as a light source, as shown in FIG. The illuminance distribution is a distribution when four projectors 90 are arranged at equal intervals in the horizontal direction.

The average illuminance of the sign advertisement 4 is 312 [lx] in FIG. 11B using the conventional projector 90, whereas it is 316 [lx] in FIG. 11A using the projector 1 of the present embodiment. In this floodlight 1, brightness equal to or higher than that when four 160 W self-ballast mercury lamps are installed is secured.
In other words, the wide area of the sign advertisement 4 having a height of 1 m and a width of 4 m, which has been conventionally illuminated using the four projectors 90, can be illuminated with sufficient brightness even with the single projector 1 (horizontally long). It can be seen that light distribution is realized.
Moreover, even when a light source is comprised with the some LED package 17, it turns out that the illumination intensity nonuniformity by the difference in the irradiation range of each LED package 17 is fully suppressed.
In the light distribution shown in FIG. 11 (A), a drop in illuminance is observed at the left and right ends on the upper edge side where the projector 1 is arranged, because the swing angle γ of the projector body 3 is zero degrees. The illuminance at the left and right ends can be increased by making the swing angle γ larger than zero degrees.

  As described above, according to the present embodiment, it is possible to illuminate the entire area of the horizontally illuminated surface 5 with the light distributed by the long-distance reflecting mirror 40A and the short-distance reflecting mirror 40B. In particular, since the light distribution can be controlled for each LED package 17 of the main pedestal portion 19, the uneven illuminance on the irradiated surface 5 can be effectively eliminated and evenly irradiated. Further, in a conventional projector using a lamp as a light source, illuminance reduction is noticeably observed at the corners on both sides of the irradiated surface 5 on the side where the projector 1 is disposed. According to the projector 1, The light distribution control of the long-distance reflecting mirror 40A can effectively distribute the light to such a corner, so that a decrease in illuminance at the corner can be prevented.

Further, according to the present embodiment, the front illumination LED package 17 </ b> C that cancels the yellow light emitted from the pair of short-distance illumination LED packages 17 </ b> B disposed on the inclined surface 30 of the main pedestal 19 is connected to the ridgeline of the main pedestal 19. The front reflecting mirror 40C that is arranged on the intersecting LED arrangement surface 32 and controls the light distribution in the ridge direction corresponding to the LED arrangement surface 32 is arranged.
Thereby, the color nonuniformity of the to-be-irradiated surface 5 can be suppressed effectively.

Further, according to the present embodiment, the long-distance reflecting mirror 40A and the short-distance reflecting mirror 40B so as to suppress the amount of light at the portion where the light that has passed through the long-distance reflecting mirror 40A and the light that has passed through the short-distance reflecting mirror 40B overlap. The roughness of the reflecting surface was changed.
Thereby, the illuminance at the part where the light overlaps can be suppressed to prevent halation, and uneven illuminance on the irradiated surface 5 can be prevented.

Moreover, according to this embodiment, the housing | casing 10 is equipped with the glove | globe 15 which covers each LED package 17, and the curve which continues the translucent surface 50 which is a site | part which opposes the LED package 17 among this glove | globe 15 without a bending point. Configured as a surface.
Thereby, since light is not condensed at the time of transmission through the translucent surface 50, unevenness in illuminance on the irradiated surface 5 is reduced, and uniform illumination is possible.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, the shape of the main pedestal portion 19 is not limited to the above-described triangular shape as long as it protrudes toward the irradiated surface 5 and has inclined surfaces on both sides.
For example, as shown in FIG. 12, the inclined surface 130A for disposing the long-distance irradiation LED package 17A and the inclined surface 130B for disposing the short-distance irradiation LED package 17B are provided on both sides in a stepped manner. The main pedestal 119 may be configured.
Further, for example, as shown in FIG. 13, the inclination angle of the inclined surface 230B for disposing the short-distance irradiation LED package 17B is made different from the inclined surface 230A for disposing the long-distance irradiation LED package 17A. The main pedestal portion 219 having a different shape may be configured. In particular, in the configuration of the main pedestal portion 219, the fluorescent color excess range β of the short-distance illumination LED package 17B is reduced by reducing the inclination angle θc of the inclined surface 230B for arranging the short-distance illumination LED package 17B. Since the portion irradiated with light moves to the left and right ends from the central portion O of the surface to be irradiated 5 and the distance to the surface to be irradiated 5 extends, color unevenness on the surface to be irradiated 5 can be suppressed and made inconspicuous.

  Further, for example, the projector according to the present invention is not limited to the illumination of the sign advertisement 4 as long as it is disposed at a position away from the irradiated surface 5 and uniformly illuminates the entire area of the irradiated surface 5. It can also be applied to applications such as backlights that illuminate the entire surface from behind and floodlights on building walls.

DESCRIPTION OF SYMBOLS 1 Light projector 3 Light projector main body 5 Surface to be irradiated 10 Housing | casing 12 Base 13 Light source part 14 Light source unit (light source)
15 Globe 16 Reflection unit 17 LED package (LED)
17A LED package for long-distance irradiation 17B LED package for short-distance irradiation 17C LED package for front-illumination 19, 119, 219 Main pedestal (pedestal)
20 Sub-pedestal part 30, 130A, 130B, 230A, 230B Inclined surface 32 LED arrangement surface 40A Long-distance reflecting mirror 40B Short-distance reflecting mirror 40C Front reflecting mirror 41 Rectangular opening 42 Reflecting surface 50 Translucent surface Da Long-distance area Db Short distance area Dc Excessive yellow area

Claims (4)

In the projector having a light source in the housing, arranged on one side edge side of the upper and lower sides of the planar irradiated surface, and irradiating the irradiated surface with the light source,
The light source comprises a plurality of LEDs;
A pedestal portion having inclined surfaces on both sides protruding toward the irradiated surface side in the housing and disposing LEDs on the distal end side and the proximal end side of the inclined surface, and an LED on the distal end side of the pedestal portion And a long-distance reflecting mirror that is arranged corresponding to one of the LEDs on the base end side and distributes light to a long distance in the horizontal direction, and a short distance that is arranged corresponding to the other and distributes light to a short distance in the horizontal direction A projector having a reflector.   The LED arranged on the inclined surface of the pedestal portion is a white LED, the LED that cancels yellow emitted from a pair of white LEDs is arranged on the LED arrangement surface that intersects the ridge line of the pedestal portion, and the LED that cancels this yellow The light projector according to claim 1, wherein a reflector that controls light distribution in a ridge line direction is arranged in correspondence with the arranged LED arrangement surface.   The roughness of the reflecting surfaces of the long-distance reflecting mirror and the short-distance reflecting mirror was changed so as to suppress the amount of light at the portion where the light passing through the long-distance reflecting mirror and the light passing through the short-distance reflecting mirror overlap. The projector according to claim 1 or 2, wherein   The said housing | casing is provided with the glove which covers each LED, The site | part which opposes LED among the said globes was equipped with the curved surface which continues without an inflection point. The floodlight described.

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