JP6709405B1 - Light source device and lighting device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of reducing a decrease in intensity of light illuminating a light emitting surface of an integrator even when a mounting angle or a mounting position of the light source device is deviated. A light source device (100) includes a plurality of light sources (120) and a plurality of optical tools (130) for converting light from corresponding light sources (120) into parallel light. [Selection diagram] Fig. 3

Description

The present invention relates to a light source device having a plurality of light sources.

Conventionally, as shown in Patent Document 1, for example, a light source device 1 having one (collective) light source 7 is prepared, and collimated light L emitted from the light source device 1 is supplied to an integrator 2 such as a fly-eye lens. An illumination device 4 has been developed which is designed to illuminate the entire light receiving surface 3 (see FIG. 8).

Then, the radiated parallel light L can illuminate the entire light-receiving surface 3 of the integrator 2, and the light source device 1 is arranged so that the optical axis CL from the light source device 1 hits the central portion of the light-receiving surface 3 in the integrator 2. It is attached to the base member 5 at a required angle.

Patent No. 6371925

However, in reality, if there is a problem in the processing accuracy or the mounting accuracy of each member, the mounting angle or the mounting position of the light source device 1 with respect to the base member 5 may deviate from the planned value. If the mounting angle or the mounting position of the light source device 1 deviates from the planned value, the irradiation range of the parallel light L emitted from the light source device 1 deviates from the plan, and a part of the parallel light L is irradiated on the irradiation surface (for example, It comes off from the light receiving surface 3) of the integrator. As a result, the intensity of the light emitted from the light emitting surface 6 of the integrator 2 may be significantly reduced.

The present invention has been made in view of the above-described problems, and an object thereof is to suppress a decrease in intensity of light that illuminates an irradiation surface to be small even when a mounting angle or a mounting position of a light source device is deviated. (EN) Provided is a light source device capable of performing, and an illuminating device using the same.

According to one aspect of the invention,
A light source device body having a base portion and an internal space;
Multiple light sources,
Equipped with multiple optics,
The plurality of light sources are mounted on the surface of the base portion,
Each of the plurality of optical tools is composed of at least two lenses, and is arranged in the internal space,
A light source device is provided in which each of the optical tools collimates light from the corresponding light source.

Preferably, the optical axes of the lights from the respective light sources, which are made into parallel lights by the respective optical tools, are parallel to each other.

Preferably, the optical axes of the light beams from the respective light sources, which are collimated by the respective optical tools, converge on the irradiation surface.

According to another aspect of the invention,
A plurality of light source devices described above,
An illuminating device is provided that includes an integrator having a light receiving surface that receives light from each of the light source devices.

Suitably, it further comprises an optical path correcting member arranged between each of the light source devices and the integrator.

According to the present invention, the light emitted from a plurality of light sources is converted into parallel light by the corresponding optical tools, so that it is possible to provide a plurality of “optical units for irradiating parallel light” provided in one light source device. Thus, even if the mounting angle or mounting position of the light source device is deviated, the light that deviates from the irradiation surface can be limited to the light emitted from any one of the plurality of light sources. As a result, it is possible to provide a light source device that can suppress a decrease in the intensity of light that illuminates the irradiation surface, and an illumination device that uses the light source device.

It is a figure which shows the illuminating device 10 which concerns on embodiment to which this invention is applied. It is a figure which shows the light source device 100 which concerns on embodiment to which this invention is applied. It is a figure explaining that all the light radiated|emitted from each light source 120 in the light source device 100 is mutually parallel. It is a figure which shows the distribution of the light intensity which the light radiated from one light source device 100 illuminates the integrator 12 (irradiation surface). It is a figure which shows the distribution of the total light intensity when the light radiated|emitted from the some light source device 100 illuminates the integrator 12 (irradiation surface). FIG. 9 is a diagram showing a distribution of light intensity when light emitted from a plurality of light sources 120 in a light source device 100 according to Modification 1 illuminates an integrator 12 (irradiation surface). FIG. 8 is a diagram showing a light source device 100 according to a modified example 1. It is a figure which shows the illuminating device 4 which concerns on a prior art.

(Structure of the lighting device 10)
Hereinafter, the configuration of the lighting device 10 to which the present invention is applied will be described with reference to the drawings. The illumination device 10 to which the present invention is applied may be used, for example, for industrial applications such as an exposure apparatus or for general illumination applications such as stage lighting and road lighting.

As shown in FIG. 1, the illumination device 10 generally includes a light source device 100, an integrator 12, and an optical path correction member 14.

As shown in FIG. 2, the light source device 100 includes a light source device body 110, a plurality of light sources 120, and a plurality of optical tools 130.

The light source device body 110 according to the present embodiment is formed in a substantially rectangular tube shape having a base portion 112, and an optical tool 130 is arranged in an internal space 114 thereof. Further, the light source 120 is mounted on the surface 116 of the base portion 112. Of course, the shape of the light source device body 110 is not limited to the rectangular tube shape, and may be a round tube shape, or the necessary number of light sources 120 and optical tools 130 are arranged and held at predetermined positions. If possible, the side (the direction orthogonal to the optical axis CL of the light source 120) is not covered, and the light source 120 and the optical tool 130 inside can be viewed from the side of the light source device 100. It may be.

In this embodiment, the surface 116 of the base 112 on which the plurality of light sources 120 are mounted is formed flat, and the optical axes CL of the light sources 120 mounted on the surface 116 are parallel to each other. ..

The light source 120 is a member that emits light having a predetermined light amount and wavelength, and in the present embodiment, a light emitting diode (LED) is used. Of course, the type of the light source 120 is not limited to the light emitting diode, and may be an organic EL, an incandescent lamp, a laser lamp, a discharge lamp, or the like.

The optical tools 130 correspond to different light sources 120, respectively, and have a role of collimating light from the corresponding light sources 120.

Throughout the present specification, “parallel light” is not limited to perfect parallel (=0°) from a geometrical point of view, and ±10° is allowed, and ±5° is allowed. It is preferably less than or equal to °.

In this embodiment, two lenses are used as the optical tool 130. Specifically, the first lens 132 is arranged near the light source 120, and the second lens 134 is arranged near the opening 118 of the light source device body 110. The light emitted from the light source 120 is refracted when passing through these two lenses 132 and 134, and becomes substantially parallel light L when it exits the second lens 134.

As described above, the optical tool 130 according to the present embodiment is composed of the two lenses 132 and 134, but the mode of the optical tool 130 is not limited to this, and one or three lenses are provided. It may be composed of the above lenses, or may be a reflector or a mirror having a reflecting surface. Further, a combination of a lens, a reflector, a mirror and the like may be used.

Further, as described above, in the present embodiment, since the respective light sources 120 are arranged on the surface 116 of the base portion 112 of the light source device body 110 so that the optical axes CL are parallel to each other, as shown in FIG. The entire light emitted from each light source 120 is a light L parallel to each other.

Returning to FIG. 1, the integrator 12 is a member having a role of receiving light from the plurality of light source devices 100 on the light receiving surface 16, increasing the uniformity of the light, and emitting the light from the light emitting surface 18. In this embodiment, a fly-eye lens having a large number of small lens bodies formed on its surface is used as the integrator 12.

The integrator 12 is not limited to the fly-eye lens as long as it can fulfill the above-described role, and for example, a rod lens or the like may be used.

The optical path correction member 14 is a member used to further increase the parallelism of the light L from the corresponding light source device 100, for example, when the parallelism of the light L from the corresponding light source device 100 is insufficient. It is placed between and. As shown in the figure, the same number of light path correction members 14 as the light source devices 100 may be prepared, and one light path correction member 14 may be used for one light source device 100, or one light path correction member 14 may be used. The correction member 14 may handle light from all the light source devices 100.

Further, in the present embodiment, a lens is used as the optical path correction member 14. Of course, the optical path correction member 14 is not limited to a lens, and for example, a reflecting mirror or the like may be used as the optical path correction member 14.

Since the optical path correcting member 14 is not an essential component of the present invention, the illumination device 10 may include the optical path correcting member 14 as a mode.

(Characteristics of the light source device 100 and the lighting device 10)
According to the above-described illumination device 10 according to the present embodiment, as shown in FIG. 3, the light emitted from each light source 120 in each light source device 100 is output by the corresponding optical tool 130 as a plurality of parallel light beams. It becomes L, and the light receiving surface 16 of the integrator 12 is irradiated.

As a result, as shown in FIG. 4, the lights emitted from the individual light sources 120 overlap each other as if one integrator 12 were a plurality of small (small in the height direction) integrators 12. Instead, the light-receiving surface 16 is illuminated (see "Light intensity" in the figure). That is, it is possible to provide a plurality of “optical units 140 that emit the parallel light L” (one-dot chain line in FIG. 4) included in one light source device 100. As a result, even if the mounting angle or mounting position of the light source device 100 is deviated, light that deviates from the light receiving surface 16 of the integrator 12 is emitted from any one of the plurality of light sources 120. You can stay in the light. As a result, it is possible to further reduce the decrease in the intensity of the light emitted from the light emitting surface 18 of the integrator 12.

Further, as a result, as shown in FIG. 5, it is possible to further improve the uniformity of the illuminance from the central portion of the integrator 12 to the vicinity of the end portions (see “total light intensity” in the figure).

(Modification 1)
In the above-described embodiment, the surface 116 of the base 112 on which the plurality of light sources 120 are mounted is formed flat, and the optical axes CL of the light sources 120 mounted on the surface 116 are parallel to each other. Instead, as shown in FIG. 6, the light sources 120 and the optical tools 130 are arranged at an angle with respect to each other so that the optical axes CL of the light sources 120 converge (match) with each other at the central portion of the integrator 12. Alternatively, the optical tool 130 may include only the first lens 132 in the figure. For example, as shown in the figure, the light source 120 and the like may be arranged at a predetermined angle with respect to the surface 116 of the base portion 112, or as shown in FIG. The base portion 113 may be provided, and the small base portions 113 may be arranged at an angle to each other.

Thereby, as shown in the figure, the illuminance in the central portion of the integrator 12 can be further increased.

(Modification 2)
In the above-described embodiment, the object to be illuminated by the light source device 100 is the integrator 12, but the object to be illuminated by the light source device 100 is not limited to the integrator 12 and may be a broader concept “irradiation surface”. Good.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

10... Illuminating device, 12... Integrator, 14... Optical path correction member, 16... Light receiving surface, 18... Light emitting surface 100... Light source device 110... Light source device main body, 112... Base part, 113... Small base part, 114... Internal space, 116... Surface (of base part 112), 118... Aperture 120... Light source 130... Optical tool, 132... First lens, 134... Second lens 140... Optical part

Claims (5)

A light source device body having a base portion and an internal space;
Multiple light sources,
Equipped with multiple optics,
The plurality of light sources are mounted on the surface of the base portion,
Each of the plurality of optical tools is composed of at least two lenses, and is arranged in the internal space,
A light source device in which each of the optical tools collimates light from the corresponding light source. The light source device according to claim 1, wherein the optical axes of the lights from the respective light sources, which are made into parallel light by the respective optical tools, are parallel to each other. The light source device according to claim 1, wherein the optical axes of the lights from the respective light sources, which are made into parallel lights by the respective optical tools, converge on each other on the irradiation surface. A light source device according to any one of claims 1 to 3;
An illuminator comprising: an integrator having a light-receiving surface that receives light from each of the light source devices. The illumination device according to claim 4, further comprising an optical path correction member disposed between each of the light source devices and the integrator.

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