JP5902499B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device, and more particularly, to a lighting device for the purpose of producing a program such as a stage, studio, or location.

  2. Description of the Related Art Lighting devices used in production spaces such as TV studios and theater stages are known. In recent years, lighting devices using LEDs or the like as light sources are known.

  In addition, an illumination device using a reflector lens, a CPC (Compound Parabolic Concentrator), or the like is known in order to increase the utilization efficiency of light emitted from a light source.

  Further, Patent Document 1 discloses a light source using an LED, a rod lens that emits light from the incident end face as a uniform light beam from the exit end face, and the incident end face of the rod lens that emits light emitted from the light source. There is described an LED spotlight comprising a first condensing means for condensing light and a second condensing means for condensing light emitted from the rod lens.

JP 2008-234908 A

  However, the above-described illumination device using an optical element such as a reflector type lens or CPC has problems such as high manufacturing cost of the optical element and difficulty in increasing the size.

  Further, the LED as the light source of the lighting device has a characteristic that the light intensity varies depending on the light emission angle. The LED light spot described in Patent Document 1 reduces uneven illuminance by a rod lens, but a condensing lens is arranged between the light source and the rod lens, and the efficiency is improved by the solid angle of use of the condensing lens. Limited. Moreover, the LED light spot described in Patent Document 1 is configured to reflect light multiple times in the rod lens to reduce illuminance unevenness, and requires a relatively long rod lens.

  The present invention has been made in view of the above-described problems, and provides a highly efficient lighting device that can reduce illuminance unevenness and color unevenness with a simple configuration, and an inexpensive lighting device. For purposes.

The illumination device according to the present invention includes a light source, a rod lens having a uniform refractive index, which is formed in a column shape and emits a light beam incident from an incident end surface from an output end surface, and is formed so as to surround the light source. An opening having the same diameter as the incident end face is disposed on the side, and the end of the opening is disposed in contact with the outer peripheral portion of the incident end face of the rod lens, and the light beam emitted from the light source is disposed on the inner peripheral side. A reflector including a reflecting surface that reflects toward the incident end surface of the rod lens; a projection lens system that is disposed on the exit end surface side of the rod lens and includes a projection lens having a diameter larger than that of the exit end surface of the rod lens; The rod lens is incident from the incident end surface, and is totally reflected once by the inner surface of the rod lens and incident on the exit end surface; Light rays incident on the exit end face without being totally reflected are overlapped on the exit end face, so that the illuminance unevenness and color unevenness of the light are uniformed on the exit end face, and emitted from the exit end face of the rod lens. The projection lens is formed so as to irradiate the projection lens without any deviation.
The column shape includes a columnar shape, a quadrangular column shape, and a polygonal column shape.

  According to the present invention, it is possible to provide a highly efficient lighting apparatus that can reduce uneven illuminance and uneven color with a simple configuration. Moreover, according to this invention, an inexpensive illuminating device can be provided.

The side view which shows an example of the whole structure of the illuminating device which concerns on embodiment of this invention. The perspective view which shows an example of the whole structure of the illuminating device which concerns on embodiment of this invention. The conceptual diagram of the illuminating device which concerns on embodiment of this invention. The figure which shows an example of the light ray in the rod lens of the illuminating device which concerns on embodiment of this invention. The figure which shows an example of the light ray reflected by the reflector of the illuminating device which concerns on embodiment of this invention. The figure which shows an example of the light ray reflected by the reflector of the illuminating device which concerns on embodiment of this invention. The figure which shows an example of the uneven | corrugated pattern part formed in the output end surface of the rod lens of the illuminating device which concerns on embodiment of this invention, (a) is a perspective view which shows an example of the rod lens which has an uneven | corrugated pattern part, (b) The cross-sectional enlarged view of the uneven | corrugated pattern part along the AA line of (a). The figure which shows an example of the integrator lens of the fly eye lens type | mold arrange | positioned at the radiation | emission end surface side of the rod lens of the illuminating device which concerns on embodiment of this invention, (a) is a perspective view of an integrator lens, (b) is an integrator lens of FIG. FIG. The figure which shows the modification of the reflector of the illuminating device which concerns on embodiment of this invention. The figure which shows an example of the whole structure of the illuminating device which concerns on other embodiment of this invention.

FIG. 1 is a side view showing an example of the overall configuration of the illumination device 1 according to the embodiment of the present invention, and FIG. 2 is a perspective view showing an example of the overall configuration of the illumination device 1.
FIG. 3 is a conceptual diagram of the illuminating device 1, FIG. 4 is a diagram illustrating an example of light rays in the rod lens 3 of the illuminating device 1, and FIG. 5 is a diagram illustrating an example of light rays reflected by the reflector 4 of the illuminating device 1.

The present invention relates to a primary illumination optical system for an uneven light source.
The illuminating device 1 which concerns on embodiment of this invention irradiates irradiation object with uniform light with few illuminance unevenness and color unevenness. The lighting device 1 can be used, for example, in a TV studio or a theater stage.

As shown in FIGS. 1 and 2, the illumination device 1 according to the embodiment of the present invention includes a light source 2, a rod lens 3, a reflector 4 as a reflector, and a projection lens system 50 including a projection lens 5. , Etc. The light source 2, the reflector 4, and the projection lens 5 are configured concentrically with the optical axis g of the rod lens 3.
Hereinafter, each component of the illuminating device 1 is demonstrated.

<Light source 2>
The light source 2 is a light emitting diode (LED), a plasma electrodeless lamp, or the like, and is a light source that emits light having luminance unevenness and color unevenness mainly depending on an emission angle. In the present embodiment, the light source 2 uses an electrodeless plasma light source.

<Rod lens 3>
The rod lens 3 emits a light beam incident from the incident end surface 3a, and a uniform light beam with reduced illuminance unevenness and color unevenness from the output end surface 3b. The rod lens 3 of this embodiment is formed in a columnar shape such as a columnar shape, and the refractive index Nr is uniform inside. Further, the incident end face 3a and the outgoing end face 3b are formed in a circular shape, are formed in the same area, and are formed in parallel. Examples of the material for forming the rod lens 3 include glass and transparent resin. For example, the rod lens 3 has a refractive index Nr of about 1.3 ≦ Nr ≦ 2.

  In the rod lens 3, as shown in FIGS. 1 and 4, the light beam emitted from the light source 2 is incident from the incident end surface 3a, and is totally reflected once by the inner surface 3c of the rod lens 3 and incident on the output end surface 3b. The light ray Cb to be incident and the light ray Ca incident without being totally reflected from the incident end surface 3a are overlapped on the output end surface 3b, so that the illuminance unevenness and the color unevenness of the light are made uniform on the output end surface 3b.

  In addition, the rod lens 3 has a shape in which the light emitted from the emission end face 3b makes the illuminance unevenness and color unevenness of the light uniform, and the light emitted from the emission end face 3b of the rod lens 3 irradiates the projection lens 5 without any deviation. And are arranged at specified positions.

<Reflector 4>
The reflector 4 is formed so as to surround the light source 2, and has an opening 4 a having the same diameter as the incident end surface 3 a of the rod lens 3 on the rod lens 3 side.
The reflector 4 is disposed so that the end 4 b of the opening 4 a is in contact with the outer peripheral portion 3 d of the incident end surface 3 a of the rod lens 3. The reflector 4 has a reflection surface 4 c that reflects the light beam emitted from the light source 2 toward the incident end surface 3 a of the rod lens 3 on the inner peripheral side. The reflection surface 4c is formed on the inclined portion 4e on the inner peripheral side so that the light beam emitted from the emission end surface 3b of the rod lens 3 is irradiated to the projection lens 5 without any deviation. In this embodiment, as shown in FIGS. 1 and 5, the reflector 4 is formed in a shape in which the inner peripheral side expands toward the rod lens 3 side.

  Further, as shown in FIG. 5, the reflecting surface 4c of the reflector 4 is reflected by the reflecting surface 4c and incident on the rod lens 3, and is totally reflected only once by the side surface 3c of the rod lens 3 or by the side surface 3c. Irradiance unevenness and color of light on the exit end face 3b of the rod lens 3 are obtained by overlapping the light ray not totally reflected and the ray incident on the entrance end face 3a from the light source 2 without being reflected by the reflection surface 4c. It is formed so as to make the unevenness uniform.

  In the present embodiment, the space 4d surrounded by the reflector 4, the rod lens 3, and the substrate 7 is filled with air.

<Projection lens 5>
The projection lens 5 is disposed on the emission end surface 3 b side of the rod lens 3 and has a larger diameter (aperture) than the emission end surface 3 b of the rod lens 3. The projection lens 5 irradiates the irradiation target with the incident light. The projection lens 5 may be used as one lens of the projection lens system 50 such as a relay lens composed of a plurality of lenses.

  For example, the projection lens 5 can perform illumination with reduced illuminance unevenness and color unevenness on the irradiated surface by forming an image of the exit end face 3b of the rod lens 3 on the irradiated surface as an irradiation target. In the present embodiment, the incident end surface, which is the end surface 5a on the rod lens 3 side of the projection lens 5, is formed in a flat shape, and the output side end surface is formed in a convex shape.

  Further, the light emitted from the emission end face 3b of the rod lens 3 is irradiated to the end face 5a of the projection lens 5 without spreading while spreading so that the cross-sectional area of the light beam cross section perpendicular to the optical axis g increases.

As will be described later, when the illumination device 1 is arranged so that the distance between the emission end surface 3b of the rod lens 3 and the end surface 5a of the projection lens 5 is a specified distance _Lrl , the end surface 5a of the projection lens 5 is used. The cross-sectional area of the light at the position is configured to be the same as the area (effective area) of the end surface 5a of the projection lens 5. In this case, the light does not leak from the projection lens 5 and the cross-sectional area of the light at the position of the end surface 5a of the projection lens 5 is maximized.
Note that the projection lens 5 may be movable so that the distance from the end surface 5a of the projection lens 5 is larger or smaller than the specified distance _Lrl .

When the distance between the exit end face 3b of the rod lens 3 and the end face 5a of the projection lens 5 is longer than the specified distance L _rl, the light cross-sectional area at the position of the end face 5a of the projection lens 5 is the projection lens 5. It is larger than the area (effective area) of the end face 5a. For this reason, the light radiate | emitted from the rod lens 3 will flow outside from the outer peripheral part of the projection lens 5, and light reception efficiency falls.

When the distance between the exit end face 3b of the rod lens 3 and the end face 5a of the projection lens 5 is shorter than the specified distance _Lrl, the light cross-sectional area at the position of the end face 5a of the projection lens 5 is the end face of the projection lens 5. It is smaller than the area (effective area) of 5a. In this case, the light emitted from the rod lens 3 cannot be moved outward from the outer periphery of the projection lens 5.

In the case of controlling the light distribution, the irradiation diameter size can be varied by adjusting the distance between the exit end face 3b of the rod lens 3 and the end face 5a of the projection lens 5. The distance L _rl is adjusted from the viewpoint of light receiving efficiency.

Next, operation | movement of the illuminating device 1 is demonstrated.
The light beam emitted from the light source 2 is reflected directly or on the reflecting surface 4 c of the reflector 4 and enters the incident end surface 3 a of the rod lens 3. In the rod lens 3, the light rays that are totally reflected once by the inner side surface 3c and the light rays that are not totally reflected overlap each other on the emission end surface 3b, so that the illuminance unevenness and the color unevenness of the light are made uniform on the emission end surface 3b. The light beam emitted from the emission end face 3 b of the rod lens 3 is irradiated to the projection lens 5 of the projection lens system 50 without any deviation.
Then, the projection lens system 50 including the projection lens 5 forms an image of the secondary light source on the irradiation target, for example, using the emission end face 3b of the rod lens 3 as the secondary light source.

  Next, the shape and arrangement of each component of the lighting device 1 according to the embodiment of the present invention will be described. Specifically, the shape and arrangement of the rod lens 3 that irradiates the entire end surface 5a of the projection lens 5 with light emitted from the light source 2 with high efficiency will be described with reference to FIG.

  As shown in FIG. 3, when the light emitted from the rod lens 3 irradiates the entire end surface 5 a of the projection lens 5 having a diameter (aperture) larger than the exit end surface 3 b of the rod lens 3, the rod lens is described in detail. In the case where the light emitted from the outer peripheral end portion of the third output end face 3 b is incident on the outer peripheral end portion of the projection lens 5, the following condition is satisfied.

The incident angle θ _l of the light with respect to the surface of the end surface 5 a of the projection lens 5 includes the incident angle θ _r of the incident end surface 3 a of the rod lens 3 from the light source 2, the exit end surface 3 b of the rod lens 3, and the rod lens 3 side of the projection lens 5. Using the specified distance (maximum distance from which no light leaks from the outer periphery of the projection lens 5) L _rl and the aperture (diameter) D _{l of} the projection lens 5, the following formula The relationship of (1) and Formula (2) is defined.

Further, the aperture (diameter) _Dr of the rod lens 3 and the length Lr along the optical axis g of the rod lens 3 are _expressed by the following mathematical formulas (3) and (3) using the refractive index Nr of the rod lens 3. 4).

When the illuminating device 1 satisfies the above conditions, the light emitted from the light emitting end surface 3b of the rod lens 3 can irradiate the light from the light source 2 to the entire end surface 5a of the projection lens 5 with high efficiency.
In addition, as shown in FIGS. 1, 2, 3, and 4, when the above-described condition is satisfied, the illuminating device 1 is totally reflected once by the inner surface 3c of the rod lens 3 and enters the emission end surface 3b. The plurality of light rays Cb that overlap with each other on the exit end surface 3b with the optical axis g as an axis of symmetry overlap with each other and the incident light rays Ca without being totally reflected from the entrance end surface 3a. Thus, the light intensity distribution is smooth and the color distribution is uniform.

  Next, the shape and arrangement of the reflector 4 of the lighting device 1 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a diagram illustrating an example of the light beam reflected by the reflector 4 of the illumination device 1.

  In the present embodiment, as shown in FIGS. 1, 3, 5, and 6, the reflector 4 is configured such that the light beam emitted from the emission end face 3 b of the rod lens 3 is incident on the incident end face 3 a on the rod lens 3 side of the projection lens 5. A reflection surface 4c for reflecting the light beam emitted from the light source 2 to the incident end surface 3a of the rod lens 3 is formed on the flat inclined portion 4e on the inner peripheral side so as to irradiate from the outer peripheral end portion to the outside.

  Specifically, the inclination of the reflecting surface 4c of the reflector 4 and the length of the rod lens 3 are defined so as to satisfy the following conditions.

As shown in FIG. 6, the projection lens 5 is disposed so as to be separated from the end surface 5 a on the rod lens 3 side, the emission end surface 3 b of the rod lens 3 by a specified distance L _rl . Here, in FIG. 6, the z-axis is defined along the left-right direction, the y-axis is defined along the up-down direction, and the x-axis is defined along the front-rear direction.
As shown in FIG. 6, after the light emitted from the position P ₀ (0, 0) where the light source 2 is disposed is reflected at the position P ₁ (x, y) on the reflecting surface 4c of the reflector 4, the rod The light enters the position P ₂ on the incident end face 3 a of the lens 3, is totally reflected once at the position P ₃ on the side face 3 c of the rod lens 3, and exits from the position P _{4 on the} exit end face 3 b. it reaches the position P ₅ in the vicinity thereof.

At this time, as shown in FIG. 6, the position P _b at a distance L _rl along from the center position P _a of the exit end face 3b of the rod lens 3 in the optical axis g, the end face 5a of the projection lens 5 is arranged ing. A position separated by a distance H _k along the y-axis direction orthogonal to the optical axis g from the position P _b is a position P ₅ where the light beam reaches.

As shown in Equation (5), when the distance H _k is equal to or less than ½ of the aperture D ₁ of the projection lens 5, no light beam can escape from the outer periphery of the projection lens 5. Further, when the distance H _k is larger than ½ of the diameter D _l of the projection lens 5, light is leaked from the outer peripheral portion of the projection lens 5 to the outside as shown in FIG.

As shown in FIG. 6, the distance H _k is a distance k between the position P _a and the position P ₄ , and a position P _c that intersects the end surface 5a of the projection lens 5 along the optical axis g from the position P _4. It is the sum of the distance H between the positions P ₅ . The distance H _k is also the sum of the distance k between the position P _b and the position P _c and the distance H.

Specifically, the light output angle θ from the light source 2 with respect to the optical axis g, the inclination α of the reflecting surface 4c of the reflector 4, and the light reflected at the position P ₁ (x, y) of the reflector 4 is a rod. The angle φ incident on the position P ₂ of the incident end surface 3 a of the lens 3 and incident into the rod lens 3 from the position P ₂ and the angle γ of the light emitted from the position P ₄ of the output end surface 3 b of the rod lens 3. The distance H _k is defined by Equations (6) to (11).

  The reflecting surface 4c of the reflector 4 is defined so as to satisfy the above-described condition, and light reflected from the light source 2 by the reflector 4 and emitted toward the projection lens 5 through the rod lens 3 is reflected on the projection lens 5. There is no leakage from the outer periphery.

It should be noted that y in the above equation is defined as a certain value if L _sr = constant, Dr = constant, θ = parameter, and α = parameter are determined. That is, the distance H _k is a function having the angle θ and the angle α as variables.

  FIG. 7 is a diagram illustrating an example of the uneven pattern portion 3m formed on the exit end surface 3b of the rod lens 3 of the illumination device 1 according to the embodiment of the present invention. Specifically, FIG. 7A illustrates the uneven pattern portion. 7B is a perspective view showing an example of the rod lens 3 having 3 m, and FIG. 7B is an enlarged cross-sectional view of the concavo-convex pattern portion 3 m along the line AA in FIG.

The illumination device 1 may employ a rod lens 3 having a concavo-convex pattern portion 3m on the emission end face 3b as shown in FIG. 7 in order to further reduce unevenness in illumination and color unevenness.
The concavo-convex pattern portion 3m is formed in a shape in which one or both of a plurality of convex-shaped portions and concave-shaped portions are arranged in the plane, and uneven illuminance and uneven color of the light emitted from the emitting end surface 3b of the rod lens 3. Homogenize.

In this embodiment, the concavo-convex pattern portion 3m is formed in a pattern in which a plurality of substantially hexagonal shapes are arranged in a plan view from the emission end face 3b side, as shown in FIGS. 7 (a) and 7 (b). Has been.
Moreover, in this embodiment, as shown in FIG.7 (b), the cross-sectional concave shape part and the cross-section flat part are alternately arranged by the regular space | interval.

  In the rod lens 3 having the above-described configuration, the light incident from the incident end surface 3a of the rod lens 3 is refracted in a predetermined direction according to the pattern by the concave and convex pattern portion 3m of the output end surface 3b. Smooth the intensity distribution and make the color distribution uniform.

  The rod lens 3 shown in FIG. 7 can be formed by filling a mold having a concavo-convex pattern corresponding to the concavo-convex pattern portion 3m with a forming material such as glass or resin and molding it.

  FIG. 8 is a view showing an example of a fly-eye lens type integrator lens 6 arranged on the exit end face 3b side of the rod lens 3 of the illumination device 1 according to the embodiment of the present invention. ) Is a perspective view of the integrator lens 6, and FIG. 8B is an enlarged cross-sectional view of the integrator lens 6.

  In order to reduce unevenness in illumination and color unevenness, the illumination device 1 has a fly-eye lens type integrator lens on the exit end face 3b side of the rod lens 3 as shown in FIGS. 8 (a) and 8 (b). 6 may be arranged. As shown in FIGS. 8A and 8B, the fly-eye lens type integrator lens 6 has a plurality of hemispherical portions, a plurality of triangular pyramid-shaped portions, a plurality of conical-shaped portions, etc. The light intensity distribution and the color distribution of the light emitted from the emission end face 3b of the rod lens 3 are made uniform.

  The fly-eye lens type integrator lens 6 shown in FIG. 8 can be formed by filling and molding a forming material such as glass or resin in a mold in which a pattern corresponding to the uneven shape of the surface is formed. it can.

FIG. 9 is a view showing a modification of the reflector 4 of the illumination device 1 according to the embodiment of the present invention.
In the reflector 4 shown in FIG. 9, a concave portion is formed in a truncated cone shape on a rectangular substrate 7 by drilling or the like, and a reflecting surface is formed on the inner peripheral side thereof. It arrange | positions so that the outer peripheral part of the entrance-end surface 3a of the rod lens 3 may contact | connect the edge part by the side of the rod lens 3 of the opening part of the reflector 4. FIG.

  FIG. 10 is a diagram illustrating an example of the overall configuration of a lighting apparatus 1 according to another embodiment of the present invention. The lighting device 1 shown in FIG. 10 employs a plasma electrodeless light source as the light source 2.

The plasma electrodeless light source includes a lamp 2p in which a light emitting material such as rare gas or mercury that forms plasma is hermetically sealed with a light-transmitting material such as glass, and an electromagnetic wave that supplies electromagnetic waves such as microwaves to the lamp 2p. (Not shown). The lamp 2p is supported by the radiator 7a.
When the electromagnetic wave is applied to the lamp 2p from the electromagnetic wave generator, the luminescent material in the lamp 2p is excited to generate plasma, which is emitted as light energy.

As shown in FIG. 10, the plasma electrodeless light source has unevenness in light emission intensity, color unevenness, etc. depending on the light emission angle due to the shape of the lamp 2p made of a light-transmitting material.
The illumination device 1 according to the present invention includes the rod lens 3, the reflector 4, and the projection lens 5 even when a plasma electrodeless light source is employed as the light source 2, and thus has a simple configuration with uneven illuminance and uneven color. Can be reduced.

  As described above, the illuminating device 1 according to the embodiment of the present invention is formed in a light source 2 and a columnar shape such as a columnar shape, and emits light incident from the incident end surface 3a from the output end surface 3b. Since the projection lens system 50 including the uniform rod lens 3, the reflector 4, and the projection lens 5 is provided, the highly efficient illumination device 1 with a simple configuration and small illuminance unevenness and color unevenness is provided.

Specifically, the reflector 4 is formed so as to surround the light source 2, and includes an opening 4 a having the same diameter as the incident end surface 3 a on the rod lens 3 side, and the end 4 b of the opening 4 a is the incident end surface 3 a of the rod lens 3. And a reflecting surface 4c that reflects the light beam emitted from the light source 2 toward the incident end surface 3a of the rod lens 3 on the inner circumferential side.
For this reason, the light emitted from the light source 2 can be incident on the rod lens 3 without leaking between the reflector 4 and the rod lens 3. That is, light energy loss can be reduced.
In addition, light having an emission angle outside the effective solid angle that is directly incident on the incident end surface 3a of the rod lens 3 from the light source 2 can also be incident on the incident end surface 3a of the rod lens 3, thereby reducing light energy loss. Thus, the highly efficient lighting device 1 can be provided.

  The rod lens 3 is incident from the incident end surface 3a, totally reflected once by the inner surface 3c of the rod lens 3 and incident on the exit end surface 3b, and totally reflected from the incident end surface 3a to the exit end surface 3b. Since the incident light ray Ca overlaps with the emission end face 3b, the emission end face 3b is formed so as to uniformize the illuminance unevenness and the color unevenness of the light. Unevenness and color unevenness can be made uniform.

For example, as a comparative example, an illuminating device that reduces illuminance unevenness by total reflection multiple times inside a rod lens requires a relatively long rod lens along the optical axis.
In the illuminating device 1 according to the embodiment of the present invention, as shown in FIGS. 3 and 4, the rod lens 3 is totally reflected once on the inner surface of the rod lens 3 and incident on the exit end face 3b. Since the light beam Ca is superimposed almost uniformly, the length of the rod lens 3 along the optical axis g is relatively short. For this reason, the illuminance unevenness and the color unevenness of the light can be made uniform, and the small illumination device 1 can be provided.

  Further, according to the embodiment of the present invention, the rod lens 3 is formed so that the light beam emitted from the emission end face 3b is irradiated to the projection lens 5 without any problem, so that the energy loss of light is reduced and the efficiency is high. The lighting device 1 can be provided.

  Moreover, the illumination device 1 according to the embodiment of the present invention can reduce uneven illuminance and uneven color with a simple configuration without using an expensive optical system such as a reflector lens or CPC.

In addition, the illumination device 1 according to the embodiment of the present invention includes a rod lens 3 having a diameter D _r , an axial length L _{r of} the rod lens 3, and a distance L _sr between the light source 2 and the rod lens 3. Since the prescribed distance L _rl between the lens 3 and the projection lens 5, the refractive index Nr of the rod lens 3, and the above formulas (1) to (4) are prescribed, illuminance unevenness and color unevenness can be obtained with a simple configuration. The highly efficient lighting device 1 that can be reduced can be provided.

  Moreover, according to the illuminating device 1 of the embodiment of the present invention, the reflector 4 rods the light beam emitted from the light source 2 so that the light beam emitted from the emission end surface 3b of the rod lens 3 irradiates the projection lens 5 completely. Since the reflecting surface 4c that reflects to the incident end surface 3a of the lens 3 is formed in the inclined portion 4e on the inner peripheral side, light does not leak outside from the outer peripheral portion of the projection lens 5, and the highly efficient illumination device 1 Can be provided.

  Moreover, according to the illuminating device 1 of embodiment of this invention, the reflector 4 reflects in the reflective surface 4c, injects into the rod lens 3, and the light ray or side surface 3c which was totally reflected only once in the side surface 3c of the rod lens 3 The light rays that are not totally reflected and the light rays that are incident on the incident end surface 3a from the light source 2 without being reflected by the reflection surface 4c are overlapped on the emission end surface 3b. Since the reflecting surface 4c is formed so as to be uniform, it is possible to provide the lighting device 1 that can further reduce illuminance unevenness and color unevenness.

  Moreover, as shown in FIG. 7, the illumination device 1 according to the embodiment of the present invention includes a plurality of rod lenses 3 that uniformize the intensity distribution of light emitted from the emission end face 3 b on the emission end face 3 b. Since it has the uneven | corrugated pattern part 3m which arranged one or both of the convex shape part and the concave shape part in the surface, the illuminating device 1 of the simple structure which can reduce illumination intensity nonuniformity and color nonuniformity can be provided further. .

  The illuminating device 1 according to the embodiment of the present invention has a simple structure even when the light source 2 having uneven light intensity or uneven color depending on the light emission angle, such as a plasma electrodeless lamp or LED, is employed. The illuminating device 1 which can reduce uneven illuminance and uneven color can be provided.

  In the above embodiment, the rod lens 3 is formed in a cylindrical shape, but is not limited to this form. The rod lens 3 may have a quadrangular prism shape, a polygonal columnar shape, a truncated cone shape having a large cross-sectional area from the incident end surface side to the emitting end surface side, a truncated cone shape having a small cross-sectional area from the incident end surface side to the emitting end surface side, or the like. Good.

  In the above embodiment, the rod lens 3 is formed so that the light beam is totally reflected by the inner side surface 3c. For example, the rod lens 3 has a reflecting surface on the side surface 3c and reflects the light beam by the reflecting surface. May be.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.
Further, the embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose and configuration.
Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light source 2p Lamp 3 Rod lens (light guide)
3a incident end face 3b outgoing end face 3c side face (inner face)
3d Peripheral part 3m Uneven pattern part (3D texture)
4 reflector 4a opening 4b end 4c reflecting surface 4d space 4e inclined part 5 projection lens (lens)
6 Fly-eye lens type integrator lens 7 Substrate 7a Radiator 50 Projection lens system

Claims (5)

A light source;
A rod lens of uniform refractive index that is formed in a column shape and emits light incident from the incident end face from the exit end face;
Formed so as to surround the light source, provided on the rod lens side with an opening having the same diameter as the incident end surface, and disposed so that the end of the opening is in contact with the outer peripheral portion of the incident end surface of the rod lens, A reflector provided with a reflection surface that reflects light emitted from the light source toward the incident end surface of the rod lens on the circumferential side;
A projection lens system that is disposed on the exit end face side of the rod lens and includes a projection lens having a larger diameter than the exit end face of the rod lens, and
The rod lens is incident from the incident end face, is totally reflected only once by the inner surface of the rod lens, and enters the exit end face, and enters the exit end face from the entrance end face without being totally reflected. The light rays are overlapped at the exit end face so that the illuminance unevenness and color unevenness of the light are uniformed at the exit end face, and the light emitted from the exit end face of the rod lens is irradiated to the projection lens without exception. A lighting device characterized by being formed. The diameter D _{r of} the rod lens, the length L _r in the axial direction of the rod lens, the distance L _sr between the light source and the rod lens, the refractive index Nr of the rod lens, the incident end surface of the rod lens from the light source The illumination device according to claim 1, wherein the illumination device is defined by the following mathematical formula according to an angle θ _r (maximum value) formed between a light beam incident on the optical axis of the rod lens .

  The reflector has an inner peripheral surface that reflects the light beam emitted from the light source to the incident end surface of the rod lens so that the light beam emitted from the emission end surface of the rod lens irradiates the projection lens. The lighting device according to claim 1, wherein the lighting device is formed on a side inclined portion.   The reflector is reflected by the reflecting surface and incident on the rod lens, a light beam that is totally reflected only once on the side surface of the rod lens or a light beam that is not totally reflected on the side surface, and without being reflected by the reflecting surface, The reflection surface is formed so that light rays incident on the incident end face from the light source overlap on the exit end face, so that the light intensity distribution and color distribution are uniformed on the exit end face. The lighting device according to claim 3. The illumination device according to any one of claims 1 to 4 , wherein the light source is a plasma electrodeless lamp or an LED.

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