JP2019074742A - Optical member, light source device, and irradiation system - Google Patents

Abstract

To provide an optical member that can obtain a rectangular irradiation area of uniform illuminance on an irradiated surface obliquely arranged with respect to an optical axis of emission light when irradiating the irradiated surface with light, and to provide a light source device that includes the optical member, as well as to provide an irradiation system that includes the light source device.SOLUTION: In a fly-eye lens, one lens has a curve surface having a curvature in a first direction (an X-axis) and a second direction (a Y-axis) orthogonal to each other on a virtual plane surface orthogonal to an optical axis (a Z-axis) of incidence light. When viewing from an optical axis direction, a plane surface shape includes at least one approximately rectangular lens surface 2 surrounded with approximately parallel two sides in the first direction and approximately parallel two sides in the second direction, in which curvature in the second direction becomes continuously larger from one end part 4 in the first direction of the lens surface 2 toward the other end part 6 therein.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical member for irradiating light to a surface to be irradiated, a light source device including the optical member, and an irradiation system including the light source device.

  A light source device that irradiates light to a surface to be irradiated is used for a signboard, illumination of a road, a projection type display device, or the like. Among them, there is a light source device using a fly's-eye lens in which a plurality of lens surfaces are arranged in a matrix in order to obtain a rectangular irradiation area on a surface to be irradiated. Furthermore, in order to make the illumination intensity in the irradiation area at the time of front illumination uniform, a projection type display apparatus provided with a light source device in which the center of each lens surface (cell) constituting the fly's eye lens is eccentric from the center in the width direction Has been proposed (see, for example, Patent Document 1).

JP, 2001-83603, A

  In the light source device described in Patent Document 1, the center of each lens surface is decentered from the center in the width direction to prevent surface slack between the lens surfaces, thereby making the illuminance of the irradiation area uniform. However, in the case of irradiating light to the surface to be irradiated that is disposed obliquely with respect to the optical axis of the emitted light instead of frontal irradiation, the irradiation area on the surface to be irradiated is not rectangular but trapezoidal in shape. The side closer to the device is brighter and the side farther away is darker, and the illuminance on the illuminated surface is not uniform. Therefore, it is not suitable for illuminating the surface to be illuminated that is disposed obliquely to the optical axis.

  The present invention has been made in view of the above problems, and in the case of irradiating light onto a surface to be irradiated that is disposed obliquely to the optical axis of the emitted light, the irradiation of rectangular uniform illuminance to the surface to be irradiated An object is to provide an optical member capable of obtaining an area, a light source device including the optical member, and an illumination system including the light source device.

  In order to solve the above-mentioned subject, an optical member concerning one mode of the present invention has a curved surface which has a curvature in the 1st direction and the 2nd direction which intersect mutually perpendicularly on an imaginary plane which intersects perpendicularly with an optical axis of incident light. The planar shape viewed from the optical axis direction is at least one lens surface of a substantially rectangular shape surrounded by two sides substantially parallel to the first direction and two sides substantially parallel to the second direction. The curvature in the second direction is continuously increased from one end of the lens surface in the first direction to the other end of the lens surface.

  A light source device according to an aspect of the present invention includes the above-described optical member, and a light source that makes parallel light incident on the optical member.

  An irradiation system according to an aspect of the present invention includes the light source device described above and an irradiated surface irradiated by the light source device, and the irradiated surface is a virtual plane orthogonal to the light emitted from the light source device. In contrast, the one end side in the first direction is disposed so as to be close to the light source device and the other end side is inclined so as to be far from the light source device.

  According to said aspect, when irradiating light to the to-be-irradiated surface arrange | positioned diagonally with respect to the optical axis of emitted light, the irradiation area | region of rectangular uniform illumination intensity can be obtained to a to-be-irradiated surface.

It is a top view which shows typically the lens surface which constitutes the fly eye lens concerning one embodiment of the present invention, and a fly eye lens. It is a perspective view which shows the detail of the lens surface shown in FIG. It is a figure which shows typically the case where the light source device provided with the fly's-eye lens shown in FIG. 1 irradiates light to a to-be-irradiated surface. FIG. 2 is a perspective view schematically showing the shape of an irradiation area in the case where light is irradiated to a surface to be irradiated, which is disposed perpendicularly to the optical axis of emission light, in the light source device including the fly's eye lens shown in FIG. . FIG. 2 is a perspective view schematically showing the shape of an irradiation area in the case where light is irradiated to a surface to be irradiated that is disposed obliquely to the optical axis of emission light in the light source device provided with the fly's eye lens shown in FIG. . It is a schematic diagram which shows the case where light is irradiated to a to-be-irradiated surface by the light of irradiation half angle (alpha) from a fly-eye lens on XZ plane. It is a perspective view which shows typically the irradiation system which concerns on one Embodiment provided with the light source device shown in FIG. It is a side view of arrow CC of FIG. 6A. It is a perspective view which shows typically the irradiation system which concerns on other embodiment provided with the light source device shown in FIG. It is a side view of arrow E of FIG. 7A. FIG. 13 is a perspective view schematically showing the shape of an irradiation area in the case where light is irradiated to the surface to be irradiated, which is disposed perpendicularly to the optical axis of the emitted light, in the conventional light source device. FIG. 13 is a perspective view schematically showing the shape of an irradiation area in the case where light is irradiated to a surface to be irradiated that is disposed obliquely to the optical axis of emitted light in a conventional light source device.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
(Optical member according to one embodiment of the present invention)
First, an optical member according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. Here, as an optical member, a case of a fly eye lens in which a plurality of lens surfaces are arranged in a matrix will be described as an example. FIG. 1 is a plan view showing a fly-eye lens 10 and a lens surface 2 constituting the fly-eye lens 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing details of the lens surface 2 shown in FIG.

In the fly's-eye lens 10 according to the present embodiment, as shown in the left side of FIG. 1, a plurality of lens surfaces 2 are arranged in a matrix. Each lens surface 2 is aligned in the same direction. In the case shown in FIG. 1, all the lens surfaces 2 are aligned so as to be convex on the front side of the drawing.
In the right side of FIG. 1, one lens surface 2 constituting the fly's eye lens 10 is shown enlarged. In the perspective view of FIG. 2, a portion having one lens surface 2 is shown cut out from the fly-eye lens 10.

In all the drawings, the direction of the optical axis incident from the light source is taken as the Z-axis direction. Of the directions orthogonal to each other on a virtual plane orthogonal to the optical axis (Z-axis direction) of incident light, the first direction is the X-axis direction, and the second direction is the Y-axis direction. Further, light emitted from the light source and the fly's eye lens is schematically shown by dotted arrows.
As shown in FIG. 1, in the lens surface 2, the planar shape viewed from the optical axis direction is substantially in two sides substantially parallel to the first direction (X-axis direction) and the second direction (Y-axis direction) It has a substantially rectangular shape surrounded by two parallel sides. The rectangles shown here also include squares.

  As apparent from FIG. 2, the lens surface 2 has curvatures in the first direction (X-axis direction) and the second direction (Y-axis direction). The curvature in the second direction (Y-axis direction) continuously increases from one end 4 to the other end 6 in the first direction (X-axis direction) of the lens surface. In other words, the radius of curvature Ryz in the second direction (Y-axis direction) is continuous from one end 4 to the other end 6 in the first direction (X-axis direction) of the lens surface Is getting smaller.

That is, assuming that the radius of curvature at one end 4 is Ryz1, the radius of curvature at the other end 6 is Ryz2, and the radius of curvature at an arbitrary position between both ends 4 and 6 in the X-axis direction is Ryz.
Ryz1>Ryz> Ryz2
Have a relationship of

In the present embodiment, the radius of curvature Ryz decreases in proportion to the distance from the one end 4. That is, when the distance between one end 4 and the other end 6 is L, the distance from one end 4 is x,
Ryz = (Ryz1-Ryz2) / L × x
It becomes.

However, the present invention is not limited to this, and as long as the value of the curvature radius Ryz changes continuously, any function using the distance x from one end 4 as a variable can be used. In that case,
It can be expressed as Ryz = f (x).
In addition, if the curvature radius Ryz (= f (x)) in the second direction (Y-axis direction) at an arbitrary position in the first direction (X-axis direction) is determined, the second direction (Y-axis direction) The radius of curvature Rxz in the first direction (the X-axis direction) at any position of is uniquely determined.

  In the present embodiment, at one end 4, a part of an elliptic curve is formed with the curvature (curvature radius Ryz 1) in the second direction (Y-axis direction), and at the other end 6, the second A part of a circular curve is formed with the curvature (curvature radius Ryz2) in the direction (Y-axis direction). Accordingly, a spline curve or Bezier curve is formed with the curvature (curvature radius Rxz) in the first direction (X-axis direction).

At this time, assuming that the curvature radius in the first direction (X-axis direction) at an arbitrary position in the second direction (Y-axis direction) is Rxz,
Ryz1>Rxz> Ryz2
It can also be made to have a relationship of

In the fly's eye lens 10 shown in FIG. 1, since the portion having the lens surface 2 shown in FIG. 2 is arranged in a matrix and integrally molded, for example, one end 4 is adjacent in the X-axis direction It is integrally molded to be in contact with the other end 6 of the portion having the lens surface 2.
In the present embodiment, the fly's eye lens 10 in which the plurality of lens surfaces 2 are arranged in a matrix is described as an example, but the present invention is not limited thereto, and an optical having only one lens surface 2 as shown in FIG. In some cases, a member may be used.

(Light source device according to one embodiment of the present invention)
Next, a light source device according to an embodiment of the present invention will be described with reference to FIGS. 3, 4A and 4B. FIG. 3 is a view schematically showing the case where the light source device 40 provided with the fly's eye lens 10 shown in FIG. 1 irradiates the surfaces 32A and 32B. FIG. 4A schematically shows the shape of the irradiation area 34A in the case of irradiating the light receiving surface 32A disposed perpendicularly to the optical axis of the emitted light in the light source device 40 provided with the fly's eye lens 10 shown in FIG. FIG. 4B is a perspective view schematically showing the shape of the irradiation region 34B in the case of irradiating the irradiation surface 32B disposed obliquely to the optical axis of the emitted light. 4A and 4B show only the fly eye lens 10 provided in the light source device 40 and the surfaces 32A and 32B to be irradiated.

  The light source device 40 according to the present embodiment includes a fly's eye lens 10 and a light source 20 that makes parallel light incident on the fly's eye lens 10. For example, a light emitting diode (LED) can be exemplified as the light source 20. Moreover, in order to make parallel light enter into the fly's eye lens 10, it is preferable to use a light source device provided with a collimating lens on the emission side of the light emitting diode (LED).

  As described later, it is preferable to use a light emitting diode (LED) from which light is spread and emitted when emitting light having a certain irradiation half angle from the lens surface of the fly eye lens 10, depending on the application A highly directional laser diode (LD) can also be used. Furthermore, it is also possible to use a light source in which a reflecting surface for spreading light to a laser diode (LD) and an optical member are combined.

  In FIG. 3, parallel light is incident from the light source 20 to the fly's eye lens 10, and light having a spread from the lens surface of the fly's eye lens 10 is emitted and is irradiated onto the surface to be irradiated. The lens surface of the fly's-eye lens 10 may be disposed on the light source 20 side, or may be disposed on the opposite emission side. The surface opposite to the lens surface is preferably a flat surface, but is not limited thereto. Further, in the case where the mounting surface of the fly's eye lens 10 is a surface not having a lens surface, particularly when it is a flat surface, it is possible to realize an efficient and efficient arrangement of the light source device 40.

In FIG. 3, a wall 30A having an illuminated surface 32A disposed perpendicular to the optical axis of the emitted light, and an illuminated surface disposed inclined at an angle θ with respect to a plane perpendicular to the optical axis of the emitted light A wall 30B with 32B is shown. In other words, the wall 30B is shown having the illuminated surface 32B whose normal is inclined by the angle θ with respect to the optical axis of the emitted light.
The shape of the irradiation area 34A when the light is irradiated to the irradiation surface 32A arranged perpendicularly to the optical axis of the emitted light is shown in FIG. 4A, and the irradiation surface 32B arranged to be inclined by the angle θ The shape of the irradiated area 34B when the light is irradiated is shown in FIG. 4A.

  Here, FIG. 8A is a perspective view schematically showing the shape of the irradiation area 134A in the case of irradiating the irradiation surface 132A disposed perpendicularly to the optical axis of the emitted light in the conventional front irradiation type light source device 140. FIG. 8B is a perspective view schematically showing the shape of the irradiation region 134B in the case of irradiating the irradiation surface 132B disposed obliquely with respect to the optical axis of the emitted light. FIGS. 8A and 8B show only the fly's eye lens 110 provided on the light source device and the surfaces to be irradiated 132A and 132B.

The conventional light source device shown in FIGS. 8A and 8B is of the front illumination type, and therefore, when the illumination surface 132A disposed perpendicularly to the optical axis of the emitted light is illuminated, the illumination area 134A has a rectangular shape. The illumination intensity in the irradiation area 134A is uniform.
However, in the case of irradiating the light receiving surface 32B disposed obliquely with respect to the optical axis of the emitted light, the light proceeds from the fly's eye lens 110 in the spreading direction, so the irradiation region 134B closer to the fly's eye lens 110 The length of the side is short, and the length of the side of the irradiation area 134B far from the fly's eye lens 110 is long, resulting in a trapezoidal shape as shown in FIG. 8B.

  In the case of a trapezoidal shape as shown in FIG. 8B, since the area is large on the side where the side length is long, the illuminance which is the light intensity per unit area is low, and the side where the length is short is Because the area is smaller, the illuminance is higher. Therefore, the irradiation area closer to the fly's eye lens 110 becomes brighter and becomes darker as it goes further away, making it impossible to perform uniform irradiation. For example, in the case where a signboard is illuminated at an angle, when this light source device is used, the area to be illuminated and the irradiation area do not match, and the illuminance of the irradiation area becomes uneven, which makes application difficult.

  On the other hand, in the present embodiment, when the light is irradiated to the irradiated surface 32A disposed perpendicularly to the optical axis of the outgoing light, as shown in FIG. 4A, the lens surface of the fly eye lens 10 is The side on one end 4 side with a small curvature (large radius of curvature Ryz1) is short and the side with a large curvature (small radius of curvature Ryz2) on the other side with end 6 is long. As described above, since the curvature (curvature radius Ryz) changes in proportion to the distance x from one end 4 in the first direction (X-axis direction), the irradiation area 34A has the long side and the short side It has a trapezoidal shape connected by straight lines.

The illuminance of the light irradiated to the surface 32A to be irradiated is the highest at one end 4 and the illuminance becomes lower toward the other end 6 and is the lowest at the other end 6. That is, the gradation is formed.
However, the curvature (curvature radius Ryz) can be changed using an arbitrary function having the distance x from one end 4 in the first direction (X-axis direction) as a variable, so the long side and the short side There is also a case where the shape is connected by a curve according to the function. Since the illuminance also changes accordingly, a gradation corresponding to it is formed.

On the other hand, the light was irradiated to the irradiated surface 32B arranged at an angle θ with respect to the plane perpendicular to the optical axis of the emitted light (the normal line is inclined at the angle θ with respect to the optical axis of the emitted light) In this case, as shown in FIG. 4B, the irradiation region 34B has a rectangular shape in which the lengths of the side on the one end 4 side and the side on the other end 6 side coincide with each other. The rectangular shape also includes a square. Further, the illuminance of light in the irradiation area 34B is uniform.
That is, when the lens surface of the fly-eye lens 10 is formed so as to have an appropriate curvature corresponding to the inclination angle θ at one end 4 and the other end 6, when inclined by an angle θ, An optimum shape of the irradiation area 34B can be obtained.

  Thus, for example, when the light source device 40 is used to illuminate the signboard from an angle, the area to be illuminated and the irradiation area 34B can be matched, and illumination can be performed with uniform illuminance in the irradiation area 34B. An excellent irradiation system can be provided.

  Next, referring to FIG. 5, how to determine the curvature of the lens surface of the fly's eye lens 10 that irradiates the light receiving surface 32B disposed at an angle θ with respect to the surface perpendicular to the optical axis of the emitted light. Will be explained. FIG. 5 is a schematic diagram showing, on the XZ plane, a case where light is irradiated from the fly's-eye lens 10 to the surface to be irradiated with light of the irradiation half angle α. The irradiation half angle α is an angle of 1/2 of the irradiation opening angle, and here, it is shown that the light of the irradiation half angle α is emitted from the center point P of the fly eye lens 10. Also in the Y-axis direction perpendicular to the drawing, light travels from the central point P of the fly-eye lens 10 at a half irradiation angle α and travels.

The curvature of the lens surface of the fly's eye lens 10 is determined as follows. First, the value of the half irradiation angle α is determined by the width dimension W of the illuminated surface 32A and the distance D from the fly's eye lens 10 to the illuminated surface 32A. In other words,
W = 2 × D × sin α
Determine α to be

  Subsequently, the curvature (see the radius of curvature Rxz in FIG. 2) of the lens surface in the first direction (X-axis direction) is determined so that light of the irradiation half angle α is emitted from the fly eye lens 10. While the curvature (radius Rxz) in the first direction (X-axis direction) has a predetermined value, the curvature (see the curvature radius Ryz in FIG. 2) of the lens surface in the second direction (Y-axis direction) is determined.

Here, the point of intersection of a line representing light traveling at the irradiation half angle α from the center point P of the fly eye lens 10 and a line representing the illuminated surface 32A disposed perpendicular to the optical axis of the outgoing light is A0 and Assume B0. That is, the intersection points A0 and B0 correspond to both end portions of the irradiation area 34A in the case of irradiating the light to the irradiated surface 32A disposed perpendicularly to the optical axis of the emitted light.
Similarly, a line indicating light traveling at the irradiation half angle α from the center point P of the fly-eye lens 10, and the irradiated surface 32B disposed obliquely at an angle θ with respect to a plane perpendicular to the optical axis of the emitted light Let Aθ and Bθ be the points of intersection with the indicated line. That is, the intersection points Aθ and Bθ correspond to both ends of the irradiation area 34B in the case of irradiating the light to the irradiated surface 32B disposed obliquely with respect to the optical axis of the emitted light.

As described above, the length D _PA0 of the side P-A0, the length D _PB0 of the side P-B0, the length D _PAθ of the side P-Aθ, and the length D _{PBθ of} the side P- _Bθ are determined. Therefore, the length of the side in the Y-axis direction at both end points A0 and B0 of the irradiation area 34A is determined, and the length of the side in the Y-axis direction at both ends Aθ and Bθ of the irradiation area 34B is determined.

For example, the length of the side in the Y-axis direction at the point Aθ is shorter than the length of the side in the Y-axis direction at the point A0.
2 × (D _PA0 −D _PAθ ) × tan α
Only become shorter.
The length of the side in the Y-axis direction at the point Bθ is smaller than the length of the side in the Y-axis direction at the point B0.
2 × (D _PBθ −D _PB0 ) × tan α
Only longer.

  Therefore, the sides in the Y-axis direction at both ends Aθ and Bθ of the irradiation area 34B of the irradiated surface 32B disposed obliquely to the optical axis of the emitted light have the same length (ie, rectangular Define the length of the side in the Y-axis direction (that is, the shape of the trapezoidal irradiation area) at both ends A0 and B0 of the irradiation area 34A of the irradiated surface 32A perpendicular to the optical axis of the outgoing light). Can.

Next, the curvature (refer to the curvature radius Ryz) in the second direction (Y-axis direction) of the lens surface is determined so that the shape of the above-described irradiation area is determined. More specifically, the radius of curvature Ryz1 at one end 4 in the first direction (X-axis direction) and the radius of curvature Ryz2 at the other end 6 are determined. Then, the radius of curvature Ryz between one end 4 and the other end 6 is continuously changed and determined (see FIG. 2).
At this time, the curvature radius Ryz is adjusted as necessary so as to obtain the curvature radius Rxz in the first direction (X-axis direction) such that the light of the irradiation half angle α is emitted.

  Next, when light of half the irradiation angle α is irradiated from the fly's eye lens 10, the illuminance at both ends Aθ and Bθ of the irradiation area 34B of the irradiated surface 32B arranged obliquely to the optical axis of the emitted light TAθ and TBθ were calculated, and TAθ / TBθ, which is the ratio of illuminance at both ends, is shown in the table below. Here, a case where the irradiation half angle α is 14 degrees (irradiation opening angle 28 degrees) and 26.5 degrees (irradiation opening angle 53 degrees) is shown.

  Since the illuminance is the intensity of light per unit area, it is inversely proportional to the area of the irradiation area. The light of the irradiation half angle α spreads not only in the X-axis direction but also in the Y-axis direction, so the illuminance is inversely proportional to the square of the side length. Actually, when the curvature of the lens surface 2 of the fly's eye lens 10 is determined, the ratio of the curvature at one end 4 and the other end 6 when the ratio of the lengths of the sides at both ends of the irradiation area exceeds two. Will be very big. Therefore, it is preferable that the ratio of the side length at both ends of the irradiation area is within 2 times, that is, the ratio TA.theta./TB.theta. Of the illuminance at both ends is within 4 times.

  In the case shown in Table 1 above, the case where the irradiation half angle α is 14 degrees is applicable even if the inclination angle θ is 50 degrees, but the case where the irradiation half angle α is 26.5 degrees Is preferably applied within a range of slightly more than 30 degrees.

  As described above, in the optical member according to the present embodiment, as shown in FIG. 2, the first direction (X-axis direction) and the second direction orthogonal to each other on a virtual plane orthogonal to the optical axis of incident light Two sides and a second direction (Y-axis direction) having a curved surface having a curvature in the (Y-axis direction) and having a planar shape viewed from the optical axis direction substantially parallel to the first direction (X-axis direction) And at least one substantially rectangular lens surface 2 surrounded by two sides substantially parallel to each other. Then, the curvature in the second direction (Y-axis direction) is continuously increased from one end 4 to the other end 6 in the first direction (X-axis direction) of the lens surface 2 .

  There may be an optical member having one lens surface 2, or it may be a fly-eye lens 10 in which a plurality of lens surfaces 2 aligned in the same direction are arranged in a matrix.

  In any case, as shown in FIG. 4B, when light is irradiated to the irradiated surface 32B disposed obliquely to the optical axis of the emitted light, an irradiation area of rectangular uniform illuminance on the irradiated surface 32B 34B can be obtained.

  Furthermore, as shown in FIG. 2, a spline curve or a Bezier curve is formed with the curvature in the first direction (X-axis direction), and an ellipse with the curvature in the second direction (Y-axis direction) at one end 4 A part of a curve of a circle can be formed at the other end 6 with a curvature in the second direction (the Y-axis direction).

  In this case, in the case of irradiating the light receiving surface 32B disposed obliquely with respect to the optical axis of the emitted light, the lens surface 2 capable of irradiating the light receiving surface 32B in a rectangular shape with uniform illuminance has a simple configuration. It can be formed efficiently.

  As shown in FIG. 3, also in the light source device 40 provided with such an optical member 10 and the light source 20 which makes parallel light enter the optical member 10, the irradiation area of the rectangular uniform illuminance on the irradiated surface 32B 34B can be obtained.

(Irradiation system according to one embodiment of the present invention)
An illumination system according to an embodiment of the invention will now be described with reference to FIGS. 6A and 6B. FIG. 6A is a perspective view schematically showing an irradiation system 50 according to an embodiment provided with the light source device 40 shown in FIG. FIG. 6B is a side view of arrows C-C in FIG. 6A.

  The irradiation system 50 according to the present embodiment includes the light source device 40 described above and the signboard 30 which is a wall portion having the light receiving surface 32B irradiated by the light source device 40. The light source device 40 is attached to the upper side of the signboard 30, and illuminates the light receiving surface 32B of the signboard 30 from diagonally above.

More specifically, as shown in FIG. 6B, the illuminated surface 32B of the sign 30 is disposed at an angle θ with respect to a plane orthogonal to the light emitted from the light source device 40. Considering one end 4 and the other end 6 in the first direction (X-axis direction) as shown in FIG. 2 on the lens surface of the fly's-eye lens provided in the light source device 40, one end The light source device 40 is attached to the sign 30 such that the light receiving surface 32B on the fourth side is close to the light source device 40 and the other end 6 side is far from the light source device 40.
Thereby, as shown to FIG. 6A, the irradiation area | region 34B of rectangular uniform illumination intensity can be obtained to the to-be-irradiated surface 32B of the billboard 30. FIG.

(Irradiation system according to another embodiment of the present invention)
An illumination system according to another embodiment of the present invention will now be described with reference to FIGS. 7A and 7B. FIG. 7A is a perspective view schematically showing an irradiation system 50 according to another embodiment provided with the light source device 40 shown in FIG. FIG. 7B is a side view of arrow E-E of FIG. 7A.

  In the irradiation system 50 according to the present embodiment, the light source device 40 described above is attached to the top of the pole 60 installed on the side of the road, and illuminates the road from diagonally above. That is, the present system includes the illuminated surface 32 B on the road illuminated by the light source device 40.

More specifically, as shown in FIG. 7B, the illuminated surface 32B on the road is disposed at an angle θ with respect to a plane orthogonal to the light emitted from the light source device 40. Considering one end 4 and the other end 6 in the first direction (X-axis direction) as shown in FIG. 2 on the lens surface of the fly's-eye lens provided in the light source device 40, one end The light source device 40 is attached to the pole 60 so that the light receiving surface 32B on the fourth side is close to the light source device 40 and the other end 6 side is far from the light source device 40.
Thereby, as shown to FIG. 7A, the irradiation area | region 34B of rectangular uniform illumination intensity can be obtained on the to-be-irradiated surface 32B on a road.

  In any of the illumination systems according to one embodiment and the other embodiments of the present invention, the irradiation surface 32B is inclined at an angle θ with respect to a plane orthogonal to the light emitted from the light source device 40. The irradiation area 34B of uniform illuminance can be obtained.

  Here, as an example, an irradiation system that obliquely applies light to a signboard and an irradiation system that obliquely illuminates a road are illustrated, but the present invention is not limited thereto, and may be oblique, including the case of using for projection type display devices The present invention includes any other irradiation system that irradiates the surface to be irradiated with light.

  Although the embodiments and modes of the present invention have been described, the disclosed contents may be varied in the details of construction, and the combinations and changes of the elements and the like in the modes and embodiments may be claimed. It can be realized without departing from the scope and spirit of the invention.

2 lens surface 4 one end 6 the other end 10 frier lens 20 light source 30A wall, signboard (perpendicular to optical axis)
30B Wall, signboard (diagonal to light axis)
32A irradiated surface (perpendicular to the optical axis)
32B Surface to be illuminated (oblique to the optical axis)
34A irradiated area (perpendicular to the optical axis)
34B Irradiation area (oblique to the optical axis)
DESCRIPTION OF SYMBOLS 40 Light source device 50 Irradiation system 60 Pole 110 Frier lens 132A Irradiated surface (perpendicular to the optical axis)
132B Irradiated surface (oblique to the optical axis)
134A Irradiated area (perpendicular to the optical axis)
134B Irradiation area (oblique to the optical axis)

Claims (1)

It has a curved surface having a curvature in a first direction and a second direction orthogonal to each other on a virtual plane orthogonal to the optical axis of incident light, and the planar shape viewed from the optical axis direction corresponds to the first direction At least one substantially rectangular lens surface surrounded by two substantially parallel sides and two sides substantially parallel to the second direction,
An optical member characterized in that the curvature in the second direction continuously increases from one end of the lens surface in the first direction to the other end in the first direction.

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