JP5553235B2 - Lighting device - Google Patents

Description

  Embodiments described herein relate generally to a lighting device used in a television studio, a theater, or the like.

  In general, a spotlight is used as an illumination device used for illumination in a television studio or a theater. In this type of spotlight, a halogen bulb or a discharge lamp is used as a light source. In recent years, a spotlight using a light emitting diode (hereinafter referred to as “LED”) has been developed.

Japanese Patent No. 4397314 JP 2010-192394 A

  In these spotlights, as shown in FIG. 5, the main body 11 incorporating the light source body 12 is generally made of sheet metal from the viewpoint of cost and the like, and has a rectangular or polygonal cylindrical shape at one end. An irradiation opening 11a is formed. And in the main body 11, in order to project the light radiated | emitted from a light source, the circular lens body 13 which consists of glass is mounted.

  For this reason, the irradiation opening 11a becomes a circular opening similar to the lens body 13, and the area through which light passes is smaller than the shape of the main body having a rectangular or polygonal cylindrical shape, and there is a problem that the efficiency of the apparatus is lowered. there were.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illumination device capable of ensuring a desired brightness.

An illuminating device configured to vary spot light distribution and flood light distribution by moving at least a lens body in an embodiment of the present invention includes a main body, a light source body, and a lens body, and the main body has a polygonal shape. It has the irradiation opening. The light source body is formed by combining a plurality of LED chips arranged in a rectangular shape to form a substantially circular light emitting unit so that the LED chip group arranged so as to form a substantially circular planar shape is covered with a substantially circular phosphor layer. Are formed, and light is emitted toward the irradiation opening. Lens body, without most lens body the exterior angle shape approximating the irradiation opening, such as the shape of the light emitting portion of the light source in a state spaced from the light source unit fits all lens function part in the spot light distribution state, the The light emitted from the light source is projected.

  According to the embodiment of the present invention, it is possible to provide an illumination device capable of ensuring desired brightness.

The perspective view which shows the illuminating device which is the 1st Embodiment of this invention. The lighting device is similarly shown, (a) is a longitudinal sectional view, and (b) is a front view of the light source body. Similarly, a simulation result of the illumination device is shown, (a) schematically shows a light trajectory in the spot state, (b) schematically shows a light trajectory in the flood state, and (c) shows the simulation result. <Table 1> and <Table 2> are shown. The illuminating device which is the 2nd Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a front view of a light source body. The front view which shows the conventional illuminating device.

  Hereinafter, an embodiment of a lighting device according to the present invention will be described.

Embodiment 1

  The illumination device of the present embodiment constitutes a spotlight used for illumination of a television studio. As shown in FIG. 1, the spotlight 10 is provided with a main body 11 having a polygonal irradiation opening 11a and a main body. The light source body 12 emits light toward the irradiation opening, and the lens body 13 has a polygonal shape approximate to that of the irradiation opening 11a and projects the light emitted from the light source body 12.

  The main body 11 constitutes a housing and is made of a metal, preferably, a heat conductive material that is light and lightweight, for example, an aluminum plate, and has a polygonal cross-sectional shape. Thus, it is configured to have a polygonal shape, in the present embodiment, a substantially square irradiation opening 11a at one end, that is, the front of the housing. As shown in FIG. 2A, the main body 11 has a cylindrical shape that covers the optical path 11b, an irradiation opening 11a is formed at one end of the optical path 11b, and a light source body 12 is provided at the other end. The inner surface of the part covering the optical path 11b of the main body 11 is painted in a non-reflective finish, for example, black. In FIG. 1, reference numeral 11 c denotes a handle for installing the spotlight 10 on the ceiling of the studio or the like, and 11 d denotes a heat radiating hole for radiating heat generated from the light source body 12.

  The light source body 12 is provided in the main body 11 and emits light toward the irradiation opening 11a. As shown in FIG. 2B, the light source body 12 includes a light emitting module including a COB (chip on board) type LED. The substrate 12a and the light emitting element 12b disposed on the substrate 12a. The substrate 12a is a thin flat plate made of ceramics so as to form a substantially square shape. In addition, you may comprise the board | substrate 12a with metals, such as aluminum and copper with favorable thermal conductivity. And the light emission part A which makes planar shape is comprised by the one surface side (surface side) of the board | substrate 12a. The light emitting portion A includes a bank portion whose inner peripheral surface is substantially circular, a plurality of light emitting elements 12b mounted on a wiring pattern formed in the bank portion, and a phosphor layer 12c filled in the light emitting elements. In the present embodiment, the plurality of light emitting elements 12b are configured by LED chips (blue), and as shown in FIG. 2B, a plurality of LED chip groups arranged in different rectangular shapes are combined to form a substantially circular shape. It is arranged so as to form a planar shape close to. Its rated power consumption is designed to be about 100W.

  In the present embodiment, the phosphor layer 12c is composed of a yellow phosphor, transmits blue light emitted from the light emitting element 12b through the phosphor layer, and excites the yellow phosphor with blue light to convert it into yellow light. Then, the transmitted blue light and yellow light are mixed to emit white light. Thereby, the light source body 12 which has the substantially circular planar light emission part A by which the light emitting element 12b is mounted and arrange | positioned by the one surface side is comprised. In FIG. 2A, the xx line is the optical axis.

  The light source body 12 configured as described above is attached to the heat radiating body 12d as shown in FIG. The radiator 12d is made of a metal having good thermal conductivity, which is aluminum in this embodiment, and a large number of radiating fins 12d1 extend in the vertical direction in FIG. 2A on the other surface side of the radiator 12d. It is integrally formed to exist. And the other surface side of the board | substrate 12a of the light source body 12 is closely_contact | adhered with respect to the flat surface of the one surface side of 12 d of heat radiators, and is fixed. Thereby, the light source body 12 made of a light emitting module can be directly attached to the heat radiating body 12d, and the heat generated from the LED which is the light emitting element 12b is directly transferred from the substrate 12a made of ceramics to the heat radiating body 12d made of aluminum. The heat radiation fin 12d1 effectively radiates heat to the outside.

  The lens body 13 collects the light emitted from the light source body 12 and projects it onto the surface to be irradiated. The lens body 13 has a polygonal shape approximate to the irradiation opening 11a of the main body 11, which is substantially the same as the irradiation opening 11a in this embodiment. It is configured as a substantially square lens body having a shape. The substantially square lens body 13 is configured to have an approximate size to the main body 11 having a substantially square cross-sectional shape so that the lens body 13 can be movably fitted in the main body 11. The lens body 13 is formed by cutting a circular Fresnel lens into a substantially square shape. The lens body 13 is made of a synthetic resin, which is a transparent acrylic resin in this embodiment, to reduce weight and cost. By the way, when the light source body is a halogen bulb, the main body and the like become hot when it is turned on, so the lens body is made of glass. However, as in this embodiment, an LED is used as the light source to prevent temperature rise. It became possible to adopt a lens body made of synthetic resin. At the same time, it has become possible to construct a lighting device with excellent spot performance using the straightness of LED light, and by adopting a Fresnel lens, soft light (light that can blur the outline) Can be projected and produced. The lens body 13 is not limited to a single lens, and may be configured by using a plurality of lenses such as two depending on the application. Furthermore, from an optical viewpoint, you may comprise with glass with higher transparency.

  The lens body 13 configured as described above is installed so that the distance from the light source body 12 can be relatively varied by the moving mechanism 14 as indicated by an arrow in FIG. That is, the lens body 13 is supported by the moving mechanism 14 and is provided to move along the optical axis xx along the optical path 11b. In the figure, reference numeral 14a denotes a lens focus handle. By rotating and adjusting the handle 14a, the lens body 13 is moved, the light emitted from the light source body 12 is focused from the flood state, and the irradiated surface is irradiated. The area is continuously changed, and the light quantity is continuously changed. The light focus may be configured to move both the lens body 13 and the light source body 12 even when the light source body 12 is moved.

  In FIG. 1 and FIG. 2, 15 is a bander provided on each side of the irradiation opening 11a of the main body 11, and the irradiation range of light from the spotlight can be set by adjusting the opening / closing angle. . The spotlight 10 having the substantially circular light source body 12 using the LED as the light source, the lens body 13 having a substantially square shape, and the irradiation opening 11a is configured as described above.

  Next, the operation of the spotlight 10 configured as described above will be described. When the power is turned on to the spotlight 10 configured as described above, each LED 12b which is a light emitting element of the light source body 12 is turned on and white light is emitted. As shown in FIGS. 3A and 3B, the white light emitted from the light source body 12 is guided toward the irradiation opening 11a by the optical path 11b of the main body 11, passes through the lens body 13, and is irradiated. Projected onto the surface Y.

  In this case, the irradiation opening 11a and the lens body 13 have a polygonal shape that approximates, that is, in the present embodiment, a substantially square having substantially the same shape. For this reason, it is possible to irradiate with a light loss from the substantially square irradiation opening 11a. As a result, the light from the light source body 12 can be projected with less loss, and the brightness of the irradiated surface can be sufficiently secured.

  Incidentally, in the conventional spotlight shown in FIG. 5, the main body 11 has a quadrangular cross section, the irradiation opening 11a is circular, and the lens body 13 is circular. Light loss occurs due to light shielding. Note that, in FIG. 5 showing the conventional example, the same reference numerals are given to the same portions as the present embodiment, and the detailed description is omitted.

  As described above, the spotlight of the present embodiment is configured such that the shape of the lens body 13 and the irradiation opening 11a is a lean shape and size along the shape and size of the main body 11, and the area through which light passes is configured. It was possible to expand and improve the efficiency of the instrument.

  At the same time, when the spotlight 10 is turned on, the temperature of the LED 12b, which is a light emitting element, rises and heat is generated. As described above, the heat generated from the LED is made of aluminum from the ceramic substrate 12a. A longer-life spotlight that is directly transmitted to the radiator 12d and effectively radiated to the outside from the radiation fins 12d1 and can suppress a decrease in the light emission efficiency of the LED, so that the brightness does not decrease over a long period of time. Can be provided.

  Next, a simulation for confirming the brightness in the spotlight 10 of the present embodiment described above was performed. This simulation pays attention to the instrument efficiency required as a spotlight, that is, the brightness on the irradiated surface at the time of spot illumination, and compared the brightness of the spotlight of the first embodiment described above with the spotlight of the conventional example. . In the first embodiment to be simulated, the irradiation opening 11a is square, the lens body 13 is square, and the light source body 12 is circular. In the conventional example to be simulated, the irradiation opening 11a is circular, the lens body 13 is circular, and the light source body 12 is circular.

  In the simulation, the brightness of the irradiated surface Y was measured from the flood state to the intermediate state and then to the spot state by moving the lens body 13. The brightness of the irradiated surface Y is the central illuminance on the irradiated surface Y, that is, the illuminance at the intersection point a between the horizontal optical axis xx and the vertical plane, as shown in FIGS. It is. A spot is an imaging state (a state where the shape of the light source is projected as it is), and a flood is a non-imaging state (a state where the frame of the irradiation aperture is projected as it is). The middle is the state at the midpoint between the spot and the flood.

  The central illuminance and light distribution of the irradiated surface Y in [Embodiment 1] [Conventional Example] were compared under the above conditions. The result is Table 1 shown in FIG. In Table 1, the light distribution is shown as an example of relative comparison of central illuminance at an irradiation distance of 3.5 m.

  As shown in Table 1, since light is diffused in the flood state, the brightness is substantially the same in the first embodiment (center illuminance 453lx) and the conventional example (center illuminance 452lx), but from the intermediate state to the spot state, Particularly in the spot state, the central illuminance of the conventional example is 2754 lx, whereas the central illuminance of the first embodiment is 3237 lx, and in the first embodiment, it has been confirmed that the brightness is improved by about 118%. In the first embodiment, the light distribution is a distribution in which the quadrangle of the irradiation aperture 11a and the lens body 13 is substantially projected from the flood state to the intermediate state, particularly a light distribution in which the four corners of the quadrangle are widened. It was confirmed that the shape of the light source 12, that is, a distribution in which a circle is projected is shown. As a result, in the first embodiment, it is confirmed that the brightness is improved at the time of a spot important as a spotlight, the efficiency of the appliance is improved, and the light distribution is widened and improved from the flood state to the intermediate state. It was done.

Embodiment 2

  As shown in FIG. 4, the spotlight of the present embodiment is obtained by forming the light source body 12 into a polygonal shape in the spotlight 10 of the first embodiment. In the present embodiment, the light source body 12 is configured in a shape that forms a substantially square shape similar to the irradiation opening 11a. As shown in FIG. 4B, this is configured by arranging a plurality of LED chip groups arranged in a substantially rectangular shape so as to form a planar shape close to a square. Its rated power consumption is designed to be about 100W. Other configurations are the same as those in the first embodiment, and in FIG. 4 showing the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .

  In this embodiment, the same simulation as that of the first embodiment was performed. This simulation was performed paying attention to the light distribution necessary for the spotlight, that is, the light distribution on the irradiated surface during spot illumination, particularly the light distribution shape. In the second embodiment to be simulated, the irradiation opening 11a is square, the lens body 13 is square, and the light source 12 is square. In the simulation, the shape of the light distribution on the irradiated surface from the flood state to the intermediate state and further to the spot state was measured by moving the lens body 13. The result is Table 2 shown in FIG.

  As shown in Table 2, in the second embodiment, the light distribution is a distribution in which the quadrangle of the irradiation aperture 11a and the lens body 13 is substantially projected from the flood state to the intermediate state, particularly the light distribution in which the four corners of the quadrangle are widened. Furthermore, it was confirmed that the quadrangular shape of the light source 12 was clearly projected even in the spot state. As a result, in the second embodiment, it was confirmed that the light distribution is widened and improved from the flood state to the intermediate state and further to the spot state. In particular, it was confirmed that the light distribution shape was clearly widened and improved at the time of a spot important as a spotlight. Also in the present embodiment, as in the first embodiment, the square of the light source body 12 is clearly projected at the time of spotting, the brightness at the time of an important spot is improved, and the instrument efficiency can be improved.

  In particular, according to the present embodiment, since the light distribution shape at the time of spotting is a square, it is possible to perform spot illumination according to the square image to be created when creating a television image that is a square screen. Thus, the brightness can be made substantially uniform over the entire screen, and a lighting device suitable for a television studio can be provided. In addition, as a spot illumination in a theater or the like, it is possible to exhibit an illumination effect / production having a rectangular light distribution shape suitable for a scene, instead of the conventional elliptical light distribution.

  As mentioned above, in each embodiment mentioned above, you may comprise the spotlight 10 as follows. The cross-sectional shape of the main body 11 is formed in a substantially square shape like the irradiation opening 11a and the lens body 13, but may be formed in a different cross-sectional shape. For example, the light source side may have a circular cross-sectional shape that matches a circular light source body, and the irradiation opening 11a having a substantially square shape may be formed continuously by pressing or the like.

  Moreover, the shape of the irradiation opening 11a and the lens body 13 is not limited to a square, but may be a polygonal shape such as a triangle, pentagon, hexagon, or octagon. According to this, particularly in spot lighting in a theater or the like, it is also possible to exert lighting effects and effects having various light distribution shapes according to the scene.

  In the second embodiment, the light source body 12 is configured to have a substantially square shape similar to the irradiation opening 11a. However, the similar shape is not a necessary condition and is different from the polygonal irradiation opening 11a. A polygonal shape, for example, the irradiation aperture may be a quadrangle and the light source body may be a hexagonal shape.

Further, in each of the above-described embodiments, the light emitting element 12b is preferably composed of, for example, an LED chip made of a gallium nitride (GaN) -based semiconductor that emits blue light, but the light emitting element uses COB technology. In addition, such as a matrix shape, a staggered shape, or a radial shape, a part or the whole may be arranged in a regular order and may be mounted, or may be a surface mount type (SMD type), In the case of the SMD type, it is preferable that a plurality of light emitting elements are configured. However, a necessary number is selected according to the use of illumination. For example, about four element groups are formed, Or you may comprise so that a some group may be made. Furthermore, it may be composed of one light emitting element. Furthermore, although it was made to light-emit in white, according to the use of an illuminating device, you may comprise red, blue, green, etc., and also combining various colors.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to each above-mentioned embodiment, A various design change can be performed in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 10 Illuminating device 11 Main body 11a Irradiation opening 12 Light source body
12b LED chip
12c phosphor layer
A Light emitting unit 13 Lens body

Claims (1)

In an illuminating device configured to change the spot light distribution and the flood light distribution at least by moving the lens body;
A body having a polygonal aperture;
A plurality of LED chips arranged in a rectangular shape are combined to form a substantially circular light emitting portion so as to cover the LED chip group arranged so as to form a substantially circular planar shape with a substantially circular phosphor layer, a light source for emitting light toward the irradiation opening;
Most lens body without any fits such irradiation opening the approximate external angle shape is a lens function part shape of the light emitting portion of the light source in a state spaced from the light source unit in the spot light distribution state, emitted from said light source A lens body that projects the emitted light;
An illumination device comprising: