JP2019062008A - Light-source device - Google Patents

Abstract

To make variable an irradiation distance of irradiation light.SOLUTION: A light-source device according to an embodiment comprises: a light-emitting element; and an optical element having a focal point for converging light emitted by the light-emitting element to a position distant from the light-emitting element. The light-source device further comprises: a pair of light condensers disposed to be axisymmetrical with respect to a symmetric axis; and a support mechanism for movably supporting the pair of light condensers respectively so as to be able to change the direction of an optical axis of condensed light concentrated by each light condenser. The pair of light condensers are provided so that an intersection where one condensed light crosses the symmetric axis coincides, on symmetric axis, with an intersection where the other condensed light crosses the symmetric axis. Of positions of the intersection, when the position closest to the light condensers is denoted by T1, and the position farthest from the light condensers is denoted by T2, the intersection is located between the position T1 and the position T2, inclusive, and the focal point of the optical element is located between the position T1 and the position T2. Through the support mechanism, the intersection is moved along the symmetric axis.SELECTED DRAWING: Figure 2

Description

  Embodiments of the present invention relate to a light source device.

  For example, in a printing apparatus using an ultraviolet curable ink (UV ink), a light source device is used which irradiates the UV ink with ultraviolet light (hereinafter simply referred to as light) for curing the UV ink. The light source device of this type includes a set of light collecting devices having an elliptical reflecting mirror for collecting light emitted from the light emitting element, and the set of light collecting devices is disposed in line symmetry with respect to the symmetry axis. The configuration is known.

  A light emitting diode (LED) as a light emitting element is disposed opposite to the reflecting surface of the elliptical reflecting mirror in each of a pair of light collecting devices, and light emitted by the LED is collected by the elliptical reflecting mirror, and The focal points of the collected light of the optical device are arranged to intersect on the symmetry axis. Also, the light collecting device has a plurality of LEDs arranged along the direction crossing the symmetry axis.

JP, 2015-222683, A

By the way, it is also considered that the degree of curing of the UV ink changes according to the irradiation energy amount of the ultraviolet light. Generally, when curing a UV ink, the integrated light quantity (mJ / cm ² ) of the irradiation light irradiated in a predetermined irradiation area influences the degree of curing of the UV ink. Furthermore, since the irradiation energy reaches the deep part in the UV ink by increasing the illuminance (mW / cm ² ) which changes according to the irradiation distance (working distance) of the irradiation light, the curing property of the UV ink Tend to be raised.

  Since the illuminance changes according to the irradiation distance of the irradiation light, the maximum value of the illuminance distribution of the irradiation light (hereinafter referred to as the illuminance peak value) changes according to the irradiation distance of the irradiation light. Here, in the light source device including the above-described set of focusing devices, the irradiation distance refers to the distance along the symmetry axis at which the intersection point where the respective collected light beams collected by the respective focusing devices intersect is located. The irradiation light of the light source device refers to the light in which the respective collected lights from the respective light collecting devices are combined.

  As described above, from the viewpoint of improving the curing property of the UV ink, it is desirable to increase both the integrated light quantity of the irradiation light and the illuminance peak value in the light source device. In order to increase both the integrated light quantity and the illuminance peak value, it is necessary to increase the number of LEDs and to shorten the irradiation distance of the irradiation light, that is, to shorten the focal distance of the condensed light of one set of condensing devices. Thus, it is conceivable to use an optical element (light collecting optical system) having a high light collecting power. However, when the number of LEDs is increased, power consumption is disadvantageously increased. On the other hand, when an optical element having a high condensing power is used, the irradiation distance is set to be relatively short, which makes it difficult to apply to a printing apparatus having specifications different in the required irradiation distance. . Therefore, considering the application of the light source device to printing devices of different specifications, the light source device can suppress the number of LEDs to an appropriate number that can obtain a desired integrated light quantity and illuminance peak value, and change the irradiation distance It is desirable to be configured.

  Then, an object of this invention is to provide the light source device which can change the irradiation distance of irradiation light.

  The light source device according to the embodiment includes a light emitting element, and an optical element having a focal point for condensing light emitted from the light emitting element at a position separated from the light emitting element, and arranged in line symmetry with respect to a symmetry axis. Each of the set of light collectors so as to change the direction of the optical axis of each set of collected light beams collected by the set of light collectors and each of the set of light collectors And a supporting mechanism for supporting, wherein the set of focusing devices is provided such that an intersection point at which each of the collected light intersects the symmetry axis overlaps on the symmetry axis, and the collection of light is performed at the intersection point When the position closest to the device is T1 and the position farthest from the light collector is T2, the intersection point is between the position T1 and the position T2, and the focal point of the optical element is Provided so as to be located between the position T1 and the position T2, Via the serial support mechanism, wherein the intersection is moved along on the axis of symmetry.

  According to the present invention, the irradiation distance of the irradiation light can be varied.

It is a perspective view showing a light source device concerning an embodiment. It is a perspective view showing a condensing device arranged in a light source device concerning an embodiment. It is a perspective view showing the 1st condensing device of the light source device concerning an embodiment. It is a perspective view which shows the modification of the support mechanism which the 1st condensing device of the light source device which concerns on embodiment has. It is a schematic diagram for demonstrating the optical path for changing the irradiation distance of the light source device which concerns on embodiment. It is a schematic diagram for demonstrating the optical path for changing the irradiation distance of the light source device which concerns on embodiment. It is sectional drawing which shows the state which shortened the irradiation distance of the light source device which concerns on embodiment. It is sectional drawing which shows the state which lengthened the irradiation distance of the light source device which concerns on embodiment. It is a figure which shows illumination distribution when the irradiation distance of the light source device which concerns on embodiment is shortened. It is a figure which shows illumination distribution when the irradiation distance of the light source device which concerns on embodiment is lengthened. It is a schematic diagram which shows the modification of the light source device which concerns on embodiment.

  A light source device according to an embodiment described below includes a set of light collecting device and a support mechanism. A condensing device has a light emitting element and an optical element. The light collectors are arranged in line symmetry with respect to the symmetry axis. The optical element has a focus for condensing light emitted by the light emitting element at a position separated from the light emitting element. The support mechanism movably supports each of the set of light collectors so as to change the direction of the optical axis of each collected light beam collected by each set of light collectors. One set of light collectors is provided such that the intersection points where the collected light intersects the symmetry axis overlap on the symmetry axis. Assuming that the position closest to the light collecting apparatus at the intersection is T1 and the position furthest from the light collecting apparatus is T2, the intersection is between the positions T1 and T2 and the focal point of the optical element is at the position T1. And the position T2 is provided. The pair of light collectors is moved along the symmetry axis at the intersection point via the support mechanism.

  In addition, the support mechanism in the light source device according to the embodiment described below supports the pair of light collectors so as to move in synchronization.

  Further, the optical element in the light source device according to the embodiment described below is an elliptical reflecting mirror that condenses the light emitted by the light emitting element.

  In addition, one set of light collecting devices in the light source device according to the embodiment described below is disposed at both ends of the elliptical reflecting mirror. One set of light collection devices comprises reflective members. The reflecting member reflects the light emitted from the light emitting element and the light reflected by the elliptical reflecting mirror. The support mechanism has a support. The support movably supports the elliptical reflector. The support portion is provided on the reflection member.

  In addition, a set of light collecting devices in the light source device according to the embodiment described below has a substrate. A light emitting element is provided on the substrate. The substrate is fixed to the elliptical reflector.

(Embodiment)
Hereinafter, the light source device according to the embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing a light source device according to the embodiment. FIG. 2 is a perspective view showing a light collecting device disposed in the light source device according to the embodiment. FIG. 3 is a perspective view showing a first light collecting device of the light source device according to the embodiment.

  The light source device of the present embodiment will be described as an example applied to a printing apparatus using UV ink, but is not limited to the application to the printing apparatus, for example, a manufacturing apparatus using an ultraviolet curable resin A light source device may be used for other applications of The light source device of the embodiment is used as a so-called line light source, for example, by arranging a plurality of light source devices in a line when used in a printing device.

(Configuration of light source device)
As shown in FIG.1 and FIG.2, the light source device 1 which concerns on embodiment collects the light which LED11 emits by 1 set of 1st condensing devices 6A and 6B which condense the light which LED11 as a light emitting element emits. And a support mechanism 8 for supporting each of the set of second light collectors 7A, 7B to be lighted and the set of first light collectors 6A, 6B and the set of second light collectors 7A, 7B. . The light source device 1 further includes a box-like housing 9 in which the first light collecting devices 6A and 6B, the second light collecting devices 7A and 7B, and the support mechanism 8 are accommodated.

  The pair of first light collectors 6A and 6B are arranged in line symmetry with respect to the symmetry axis X1. The pair of second light collectors 7A and 7B are disposed in line symmetry with respect to the symmetry axis X1, and are disposed outside the pair of first light collectors 6A and 6B about the symmetry axis X1. There is. Each of the first light collecting devices 6A, 6B has a plurality of LEDs 11, a substrate 12 provided with a plurality of LEDs 11, and an elliptical reflecting mirror 13 as an optical element for collecting light emitted from the plurality of LEDs 11. As LED11, UV-LED which emits an ultraviolet-ray is used.

  As shown in FIG. 3, the substrate 12 is formed in a long shape, and a plurality of LEDs 11 are arranged in a line along the longitudinal direction. The arrangement of the plurality of LEDs 11 is not limited to the configuration in which the LEDs 11 are arranged in a row, and may be in a so-called staggered arrangement in which the positions are alternately shifted in the direction intersecting the arrangement direction. One end of the substrate 12 parallel to the longitudinal direction is fixed to the elliptical reflecting mirror 13. Moreover, the board | substrate 12 may be fixed to the cooling block which can flow a thermal radiation fin and a cooling medium inside the surface of the back side of the mounting surface in which several LED11 was arranged. Thereby, the temperature rise of LED11 is suppressed and the fluctuation | variation of the illumination intensity of irradiation light is suppressed.

  The elliptical reflecting mirror 13 has a reflecting surface 13 a that reflects and condenses the light emitted by the plurality of LEDs 11, and the plurality of LEDs 11 are disposed to face the reflecting surface 13 a. The plurality of LEDs 11 are arranged along a first focal point of the reflecting surface 13 a of the elliptical reflecting mirror 13. The elliptical reflecting mirror 13 as an optical element has a focal point F (second focal point) for condensing the light emitted from the LED 11 at a position separated from the LED. Support shafts 13 b supported by a support mechanism 8 are provided on both ends of the elliptical reflection mirror 13 in the arrangement direction of the plurality of LEDs 11. The support shaft 13 b is, for example, fixed to the side surface of the elliptical reflecting mirror 13 via a mounting member (not shown).

  Therefore, the elliptical reflecting mirrors 13 of the first light collecting devices 6A and 6B are arranged in line symmetry with respect to the symmetry axis X1 on a plane orthogonal to the arrangement direction of the plurality of LEDs 11. Similarly, the elliptical reflectors 13 of the second light collectors 7A and 7B are arranged in line symmetry with respect to the symmetry axis X1 on a plane orthogonal to the arrangement direction of the plurality of LEDs 11.

  The second light collecting devices 7A and 7B included in the light source device 1 are also configured in the same manner as the first light collecting devices 6A and 6B. Therefore, in each of the second light collecting devices 7A and 7B, the same components as those of the first light collecting devices 6A and 6B described above are denoted by the same reference numerals as those of the first light collecting devices 6A and 6B. The description of the light collectors 7A and 7B is omitted.

  The light source device 1 includes a pair of first light collectors 6A, 6B and a pair of second light collectors 7A, 7B via the support mechanism 8 for each of the elliptical reflectors 13, ie, the plurality of LEDs 11. By rotating about a virtual axis passing on the light emitting surface (for example, the emission surface of the exterior material of the LED 11 and the mounting surface of the substrate 12), the pair of first light collectors 6A and 6B and the pair of The direction of the optical axis X2 of the collected light collected by each of the second light collecting devices 7A and 7B is changed (see FIGS. 5 and 6).

  As shown in FIGS. 1 and 2, the support mechanism 8 is attached to the outside or the inside of the housing 9 and has a plurality of support portions 8 a that respectively support the support shafts 13 b of the elliptical reflecting mirrors 13. The support portion 8a rotatably supports, for example, the support shaft 13b, and is configured to be able to fix the support shaft 13b at a predetermined rotational position around the support shaft 13b. The support mechanism 8 may have, for example, a lock mechanism that restricts and fixes the support shaft 13 b at a predetermined rotational position around the support shaft 13 b. In addition, the support mechanism 8 is configured to synchronously rotate both of the pair of first light collectors 6A and 6B. Similarly, the support mechanism 8 is configured to synchronously rotate both of the pair of second light collectors 7A and 7B.

  In addition, the support mechanism 8 is an angle adjustment mechanism (not shown) for rotating the first light collecting devices 6A and 6B and the second light collecting devices 7A and 7B around the support shaft 13b of the elliptical reflecting mirror 13. Can be connected with the mechanism). Although not shown, the support mechanism 8 may have, for example, a gear for rotating the elliptical reflecting mirror 13 around the support shaft 13b, a gear portion formed in the elliptical reflecting mirror 13, and the like.

  The support mechanism 13 described above is provided with the support shaft 13 b so as to rotate around the light emitting surfaces of the plurality of LEDs 11, but the support shaft 13 b may be provided at a position separated from the light emitting surface of the LED 11. FIG. 4 is a perspective view showing a modified example of the support mechanism 13 of the first light collecting device 6A, 6B of the light source device 1 according to the embodiment. As shown in FIG. 4, the support shaft 13 b is provided on the side surface of the elliptical reflecting mirror 13 so as to be separated from the substrate 11, and the first light collectors 6 A and 6 B (second By providing the optical devices 7A and 7B) to be rotated about a virtual axis passing near the center of gravity of the elliptical reflecting mirror 13, it is possible to enhance the stability of the rotational operation.

  As shown in FIG. 1, the housing 9 is provided with an opening 9a on the side for emitting the irradiation light toward the UV ink to be irradiated, and the opening 9a is a panel member 10 having a permeability to ultraviolet light. Covered (see Figures 7 and 8). Further, as shown in FIG. 1 and FIG. 2, a pair of side mirrors 14 as a reflecting member for reflecting the light emitted by the LED 11 and the light reflected by the elliptical reflecting mirror 13 are provided in the housing 9 There is. The side mirrors 14 are disposed at both ends in the arrangement direction of the LEDs 11 and fixed to the housing 9. For example, a plane mirror is used as the side mirror 14. The support portion 8 a of the support mechanism 8 is provided to the side mirror 14.

(Light path for changing the irradiation distance of the light source device)
In the light source device 1 configured as described above, an optical path for changing the irradiation distance will be described. Hereinafter, although only one set of first light collectors 6A and 6B will be described, the same applies to one set of second light collectors 7A and 7B. FIG.5 and FIG.6 is a schematic diagram for demonstrating the optical path for changing the irradiation distance of the light source device 1 which concerns on embodiment.

  As shown in FIG. 5, one of the first light collecting devices 6A is disposed at the position S1, the other first light collecting device 6B is disposed at the position S2, and the pair of first light collecting devices 6A and 6B are The distance h is axisymmetric with respect to the symmetry axis X1. At this time, a distance 2h is established between the one first light collecting device 6A and the other first light collecting device 6B (between the position S1 and the position S2) across the symmetry axis X1. Each of the first light collectors 6A and 6B is capable of pivoting the optical axis X2 of the collected light collected by the elliptical reflecting mirror 13 within a range of inclination angles θ1 to θ2 with respect to the direction of the symmetry axis X1. , Is supported by the support mechanism 8.

  The respective collected light beams collected by the respective first light collecting devices 6A and 6B overlap each other at the intersection point C where the respective collected light beams intersect the symmetry axis X1. FIG. 5 schematically shows how the cross section of the light flux of the collected light changes as the direction of the optical axis X2 of each of the collected light collected by the first light collectors 6A and 6B is changed. .

  As shown in FIG. 6, the pair of first light collectors 6A and 6B is rotated within the range of the inclination angles θ1 to θ2 through the support mechanism 8 to form a pair of first light collectors An intersection point C of the respective collected light beams 6A and 6B moves along a symmetry axis X1 in a predetermined range between the positions T1 and T2. Thus, the illumination light in which the respective collected lights are combined by moving the intersection point C where the collected lights of the pair of first light collectors 6A and 6B overlap with each other within the predetermined range along the symmetry axis X1. The position of the intersection point C of the light changes. Thereby, the light source device 1 can change the irradiation distance so that the desired integrated light amount and the illuminance peak value can be properly compatible. At this time, in the first light collecting devices 6A and 6B, the light collecting system in which the focal point F of the first light collecting devices 6A and 6B is located between the position T1 and the position T2 on the symmetry axis X1 in FIG. Have.

Therefore, as shown in FIG. 6, assuming that the distance between each position S1, S2 of each of the first light collecting devices 6A, 6B and the focal point F is R, the light source device 1
{H / sin (θ1)} ≦ R ≦ {h / sin (θ2)} (Equation 1)
Light collecting optical system satisfying

When each of the first light collecting devices 6A and 6B has the elliptical reflecting mirror 13, the focal distance between the first focal point and the second focal point of the reflecting surface 13a corresponds to the distance R in FIG. Assuming that the major axis radius is a and the minor axis radius is b, the elliptical reflector 13
{H / sin (θ1)} ≦ 2√ (a ² −b ² ) ≦ {h / sin (θ 2)} (Equation 2)
Have an ellipse that satisfies

  For example, when the light source device 1 is assembled to a printing device (not shown) that uses UV ink, each of the first light source devices 1 is set to have a desired irradiation distance set in the specifications of each printing device. The irradiation distance is adjusted by changing the direction of the optical axis X2 of the collected light of the light collecting devices 6A and 6B and the second light collecting devices 7A and 7B. At this time, although not shown, by connecting the angle adjustment mechanism separately provided to the light source device 1 and the support mechanism 8, the light source device 1 has supporting shafts for the elliptical reflecting mirrors 13 via the support mechanism 8. The irradiation distance is adjusted by rotating around 13 b.

  In addition, the support mechanism 8 may be configured to rotate the pair of first light collectors 6A and 6B and the pair of second light collectors 7A and 7B in synchronization with each other, respectively. The irradiation distance of the light source device 1 can be easily adjusted by rotating the light collecting devices 6A, 6B and the second light collecting devices 7A, 7B collectively. Further, the support mechanism 8 is configured to synchronously rotate both of the pair of first light collectors 6A and 6B and the pair of second light collectors 7A and 7B. One light collecting device 6A, 6B and each second light collecting device 7A, 7B may be configured to be movable independently.

(Adjustment of irradiation distance of light source device)
FIG. 7: is sectional drawing which shows the state which shortened the irradiation distance of the light source device 1 which concerns on embodiment. FIG. 8 is a cross-sectional view showing a state in which the irradiation distance of the light source device 1 according to the embodiment is increased. As shown in FIG. 7 and FIG. 8, the light source device 1 sets the direction of the optical axis X2 of each collected light of the set of first light collecting devices 6A, 6B and the set of second light collecting devices 7A, 7B. By changing it, the intersection point C is moved along the symmetry axis X1, and for example, the irradiation distance WD can be adjusted within a range of about 30 [mm] to about 80 [mm]. Here, the irradiation distance WD is a distance along the symmetry axis X1 between the UV ink as the irradiation target of the irradiation light and the panel member 10 of the light source device 1.

  In the present embodiment, the irradiation distance WD is configured to be adjustable within a range of about 30 [mm] to about 80 [mm] as the irradiation distance WD required for a general printing apparatus, but is adjustable It does not limit the range. The adjustable range of the irradiation distance WD may be appropriately set in accordance with various manufacturing apparatuses and the like to which the light source device 1 is applied.

FIG. 9 is a view showing the illuminance distribution when the irradiation distance of the light source device 1 according to the embodiment is shortened. FIG. 10 is a view showing the illuminance distribution when the irradiation distance of the light source device 1 according to the embodiment is increased. 9 and 10, the vertical axis represents illuminance [mW / cm ² ], and the horizontal axis represents position [mm] from the symmetry axis X1 (intersection point C), and for convenience, positive and negative numbers are added about the symmetry axis X1. Show.

In the light source device 1, when the irradiation distance WD is 30 [mm], the illuminance distribution narrows as shown in FIG. 9, and an illuminance peak value of less than 7000 [mW / cm ² ] is obtained. The light source device 1, when the irradiation distance WD is 80 [mm], as shown FIG. 10, but the illuminance distribution spreads than when a short throw distance ^{WD, 5000 [mW / cm 2} ] weak illuminance peaks A value is obtained. Therefore, the illuminance peak value is properly secured within the range of about 30 [mm] to about 80 [mm] of the irradiation distance WD.

  The first light collectors 6A and 6B and the second light collectors 7A and 7B in the embodiment are not limited to the configuration for collecting light using the elliptical reflecting mirror 13, and instead of the elliptical reflecting mirror 13, the LED 11 is used. For example, a condensing optical system having a condensing lens, a prism, a plane reflecting plate, a light guide, or the like may be used as an optical element for condensing light emitted by the light source.

  The support mechanism 8 in the present embodiment is not limited to the configuration having the support portion 8 a that supports the support shaft 13 b of the elliptical reflecting mirror 13, and is appropriately changed in the configuration that rotatably supports the elliptical reflecting mirror 13. May be For example, the support shaft 13 b may be extended to the outside of the housing 9.

  The light source device 1 according to the above-described embodiment changes the direction of the optical axis X2 of the collected light collected by each of the first light collecting devices 6A and 6B (second light collecting devices 7A and 7B). Thus, a supporting mechanism 8 for movably supporting each of the pair of first light collectors 6A and 6B (second light collectors 7A and 7B) is provided, and provided so as to overlap on the symmetry axis X1. An intersection point C at which each collected light intersects the symmetry axis X1 is moved along the symmetry axis X1 via the support mechanism 8. Thus, the irradiation distance WD of the irradiation light can be arbitrarily varied within the predetermined range.

  Therefore, according to the light source device 1, the increase in power consumption is suppressed by suppressing the number of LEDs 11 to an appropriate number that can obtain a desired integrated light amount and illuminance peak value, and a plurality of types of specifications with different irradiation distances WD. It becomes possible to apply to manufacturing apparatuses, such as a printing apparatus. Therefore, the versatility of the light source device 1 can be enhanced, and the light source device 1 can be made common in printing devices of a plurality of types of specifications, and an increase in the manufacturing cost of the printing device can be suppressed. Further, according to the light source device 1, it is also possible to finely adjust the irradiation distance WD via the support mechanism 8 according to the necessity at the time of maintenance of the printing apparatus or the like.

  Further, the support mechanism 8 in the embodiment supports the pair of first light collectors 6A and 6B (second light collectors 7A and 7B) so as to rotate in synchronization. By rotating the two first light collecting devices 6A and 6B (the second light collecting devices 7A and 7B) in synchronization in this manner, the adjustment work of the irradiation distance WD can be easily performed.

  Further, the first light collectors 6A and 6B (second light collectors 7A and 7B) in the embodiment have the elliptical reflecting mirror 13 for collecting the light emitted by the LED 11. By using the elliptical reflecting mirror 13, an optical element for condensing light emitted by the LED 11 can be simply configured.

  In addition, a pair of first light collectors 6A and 6B (second light collectors 7A and 7B) in the embodiment are disposed at both ends of the elliptical reflector 13 and reflected by the light emitted from the LED 11 and the elliptical reflector 13 The side mirror 14 is provided with a support portion 8 a of a support mechanism 8 that has a side mirror 14 that reflects light and movably supports the elliptical reflector 13. Thereby, the support mechanism 8 can be configured to be compact, and the light source device 1 can be miniaturized.

  Further, in the pair of first light collectors 6A and 6B (second light collectors 7A and 7B) in the embodiment, the substrate 12 provided with the LED 11 is fixed to the elliptical reflection mirror 13. Thus, the first light collecting devices 6A and 6B (the second light collecting devices 7A and 7B) can be miniaturized.

  In addition, although the light source device 1 of this embodiment is provided with 1st light-condensing devices 6A and 6B and each 2nd light-condensing devices 7A and 7B which are two sets of light-condensing devices (four light-condensing devices), The number of devices is not limited, and three or more sets of light collecting devices may be provided. In addition, the light source device 1 is, for example, a condensing lens or the like on the optical axis X2 of the condensed light collected by the elliptical reflecting mirror 13 of the first light collecting devices 6A and 6B (the second light collecting devices 7A and 7B). Other optical elements may be disposed, and the other optical elements move the intersection point C of the collected light along the symmetry axis X1 in conjunction with the movement of the elliptical reflecting mirror 13 via the support mechanism 8 It may be moved as it is. For example, after another reflecting surface is added as an optical element and the condensed light collected by the elliptical reflecting mirror 13 is further reflected by the other reflecting surface, the focal point of each reflected light is an intersection point on the symmetry axis X1 It may be configured to overlap at C.

  In addition, in the first light collectors 6A and 6B (second light collectors 7A and 7B) included in the light source device 1 according to the present embodiment, the plurality of LEDs 11 in the substrate 12 provided with the plurality of LEDs 11 are not mounted. Although the surface side (the back side of the mounting surface) is disposed to face the symmetry axis X1, it is not limited to this configuration. FIG. 11 is a schematic view showing a modified example of the light source device according to the embodiment. For example, as shown in FIG. 11, the first light collectors 6A and 6B (the second light collectors 7A and 7B) are mounted on the substrate 12 on which the plurality of LEDs 11 are mounted (the light emission surface side of the LEDs 11). ) May be disposed opposite to the symmetry axis X1.

  While embodiments of the present invention have been described, the embodiments are presented as examples and are not intended to limit the scope of the present invention. The embodiment can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The embodiments and the modifications thereof are included in the invention described in the claims and the equivalent scope as well as included in the scope and the gist of the present invention.

1 light source device 6A, 6B first light collector (light collector)
7A, 7B second condenser (condenser)
8 support mechanism 8a support portion 11 LED (light emitting element)
13 Elliptical Reflector (Optical Element)
13a Reflecting surface 14 Side mirror X1 Symmetry axis X2 Optical axis C Intersection point F Focus WD irradiation distance

Claims (5)

A set of light collectors comprising: a light emitting element; and an optical element having a focal point for focusing light emitted from the light emitting element at a distance from the light emitting element, and arranged axisymmetrically with respect to a symmetry axis When;
A support mechanism movably supporting each of the one set of focusing devices so as to change the direction of the optical axis of each of the collected light beams collected by each of the one set of focusing devices;
Equipped with
The one set of focusing devices is provided such that an intersection point at which each of the collected light intersects the symmetry axis is overlapped on the symmetry axis, and the position closest to the focusing device at the intersection point is T1. When the position farthest from the light collecting apparatus is T2, the intersection point is located between the position T1 and the position T2, and the focal point of the optical element is between the position T1 and the position T2. A light source device, which is provided to be located at the point where the intersection point is moved along the symmetry axis via the support mechanism. The support mechanism supports the set of focusing devices to move in synchronization.
The light source device according to claim 1. The optical element is an elliptical reflector that condenses light emitted by the light emitting element.
The light source device according to claim 1. The one set of light collecting devices includes reflecting members disposed at both ends of the elliptical reflecting mirror to reflect the light emitted from the light emitting element and the light reflected by the elliptical reflecting mirror.
The support mechanism has a support that movably supports the elliptical reflector, and the support is provided on the reflection member.
The light source device according to claim 3. The one set of focusing devices has a substrate provided with the light emitting element, and the substrate is fixed to the elliptical reflector.
The light source device according to claim 3.