JP6996920B2 - Light source device - Google Patents

Description

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

For example, in a printing device using ultraviolet curable ink (UV ink), a light source device that irradiates the UV ink with ultraviolet rays (hereinafter, simply referred to as light) that cure the UV ink is used. This type of light source device includes a set of light collectors having an elliptical reflector that collects the light emitted by the light emitting element, and the set of light collectors are arranged line-symmetrically with respect to the axis of symmetry. The composition is known.

In each of the set of light collecting devices, a light emitting diode (LED) as a light emitting element is arranged facing the reflecting surface of the elliptical reflecting mirror, and the light emitted by the LED is collected by the elliptical reflecting mirror, and each collection is performed. The focused light of the light device is arranged so as to intersect on the axis of symmetry. Also, the light collector has a plurality of LEDs arranged along a direction intersecting the axis of symmetry.

JP-A-2015-222683

By the way, it is also considered that the degree of curing of UV ink changes depending on the amount of irradiation energy of ultraviolet rays. Generally, when the UV ink is cured, the integrated light amount (mJ / cm ² ) of the irradiation light irradiated in the predetermined irradiation region affects the degree of curing of the UV ink. Furthermore, the illuminance (mW / cm ² ) that changes according to the irradiation distance (working distance: Working Distance) of the irradiation light increases, so that the irradiation energy reaches the deep part of the UV ink, and thus the curability of the UV ink. Tends to be increased.

As for the illuminance, since the maximum value in 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, it is preferable to shorten the irradiation distance in order to increase the illuminance. Here, in the light source device provided with the above-mentioned set of condensing devices, the irradiation distance refers to the distance along the axis of symmetry where the intersections of the condensing lights collected by each condensing device intersect. The irradiation light of the light source device refers to the combined light of each condensed light from each condensing device.

As described above, from the viewpoint of improving the curability of the UV ink, it is desirable to increase both the integrated light amount and the illuminance peak value of the irradiation light in the light source device. In order to increase both the integrated light amount and the illuminance peak value, increase the number of LEDs and shorten the irradiation distance of the irradiation light, that is, shorten the focal length of the focused light of a set of condensing devices. It is conceivable to use an optical element (condensing optical system) having a high light-collecting power. However, when the number of LEDs is increased, there is a disadvantage that the power consumption increases. On the other hand, when an optical element having a high light-collecting power is used, the irradiation distance is set to be relatively short, which makes it difficult to apply to printing devices having specifications having different required irradiation distances. .. Therefore, considering the application of the light source device to printing devices having different specifications, the number of LEDs of the light source device is limited to an appropriate number for obtaining a desired integrated light amount and illuminance peak value, and the irradiation distance is variable. It is desirable to be configured as follows.

Therefore, an object of the present invention is to provide a light source device capable of varying the irradiation distance of the irradiation light.

The light source device according to the embodiment includes a light emitting element and an optical element having a focal point that concentrates the light emitted by the light emitting element at a position separated from the light emitting element, and is arranged linearly symmetrical with respect to the axis of symmetry. Each of the set of condensing devices can be moved so as to change the direction of the optical axis of each condensing light collected by each of the condensing device and the condensing device. A support mechanism for supporting the light is provided, and the set of condensing devices is provided so that the intersections of the condensing lights intersecting the axis of symmetry overlap on the axis of symmetry, and the condensing light is provided at the intersections. When the position closest to the device is T1 and the position farthest from the light collector is T2, the intersection is located between the position T1 and the position T2, and the focal point of the optical element is located. It is provided so as to be located between the position T1 and the position T2, and the intersection is moved along the axis of symmetry via the support mechanism.

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

It is a perspective view which shows the light source apparatus which concerns on embodiment. It is a perspective view which shows the condensing device arranged in the light source device which concerns on embodiment. It is a perspective view which shows the 1st condensing device of the light source device which concerns on 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 varying the irradiation distance of the light source apparatus which concerns on embodiment. It is a schematic diagram for demonstrating the optical path for varying the irradiation distance of the light source apparatus which concerns on embodiment. It is sectional drawing which shows the state which shortened the irradiation distance of the light source apparatus which concerns on embodiment. It is sectional drawing which shows the state which increased the irradiation distance of the light source apparatus which concerns on embodiment. It is a figure which shows the illuminance distribution when the irradiation distance of the light source apparatus which concerns on embodiment is shortened. It is a figure which shows the illuminance distribution when the irradiation distance of the light source apparatus which concerns on embodiment is lengthened. It is a schematic diagram which shows the modification of the light source apparatus which concerns on embodiment.

The light source device according to the embodiment described below includes a set of condensing devices and a support mechanism. The light collecting device includes a light emitting element and an optical element. The light collecting device is arranged line-symmetrically with respect to the axis of symmetry. The optical element has a focal point that focuses the light emitted by the light emitting element at a position away from the light emitting element. The support mechanism movably supports each of the set of condensing devices so that the direction of the optical axis of each condensing light collected by each of the set of condensing devices is changed. The set of condensing devices is provided so that the intersections of the condensing lights intersecting the axis of symmetry overlap on the axis of symmetry. When the position closest to the light collector is T1 and the position farthest from the light collector is T2 at the intersection, the intersection is located between the position T1 and the position T2, and the focal point of the optical element is the position T1. It is provided so as to be located between the position T2 and the position T2. A set of light collectors has their intersections moved along an axis of symmetry via a support mechanism.

Further, the support mechanism in the light source device according to the embodiment described below supports the set of condensing devices so as to move synchronously.

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

Further, a set of condensing devices in the light source device according to the embodiment described below is arranged at both ends of the elliptical reflecting mirror. A set of light collectors has a reflective member. The reflecting member reflects the light emitted by the light emitting element and the light reflected by the elliptical reflecting mirror. The support mechanism has a support portion. The support portion movably supports the elliptical reflector. The support portion is provided on the reflective member.

Further, the set of condensing 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 an 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 an embodiment. FIG. 2 is a perspective view showing a light collecting device arranged 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 as being applied to a printing device using UV ink, but the application is not limited to the printing device, and for example, a manufacturing device using an ultraviolet curable resin or the like. A light source device may be used for other purposes. When the light source device of the embodiment is used in a printing device, for example, a plurality of light source devices are arranged in a row, so that the light source device is used as a so-called line light source.

(Configuration of light source device)
As shown in FIGS. 1 and 2, the light source device 1 according to the embodiment collects a set of first light collecting devices 6A and 6B that collect light emitted by LED 11 as a light emitting element, and light emitted by LED 11. It includes a set of second light collecting devices 7A and 7B that illuminate, and a support mechanism 8 that supports each of a set of first light collecting devices 6A and 6B and a set of second light collecting devices 7A and 7B. .. Further, the light source device 1 includes a box-shaped 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 housed.

The set of first light collectors 6A and 6B are arranged line-symmetrically with respect to the axis of symmetry X1. The set of second light collectors 7A and 7B are arranged line-symmetrically with respect to the axis of symmetry X1 and are arranged outside the set of first light collectors 6A and 6B with the axis of symmetry X1 as the center. There is. Each of the first condensing devices 6A and 6B has a plurality of LEDs 11, a substrate 12 provided with the plurality of LEDs 11, and an elliptical reflecting mirror 13 as an optical element for condensing the light emitted by the plurality of LEDs 11. As the LED 11, a UV-LED that emits ultraviolet rays 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 row along the longitudinal direction. The arrangement of the plurality of LEDs 11 is not limited to the configuration in which they are arranged in a single row, and may be arranged in a so-called staggered arrangement in which the positions are alternately shifted in the direction intersecting the arrangement direction along the arrangement direction. One end of the substrate 12 parallel to the longitudinal direction is fixed to the elliptical reflector 13. Further, the substrate 12 may have a surface on the back side of a mounting surface in which a plurality of LEDs 11 are arranged fixed to a heat radiation fin or a cooling block through which a cooling medium can flow inside. As a result, the temperature rise of the LED 11 is suppressed, and the fluctuation of the illuminance of the irradiation light is suppressed.

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

Therefore, the elliptical reflectors 13 of the first light collectors 6A and 6B are arranged line-symmetrically with respect to the axis of symmetry 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 line-symmetrically with respect to the axis of symmetry 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 the above-mentioned first light collecting devices 6A and 6B are designated by the same reference numerals as those of the first light collecting devices 6A and 6B, and the second light collecting devices 6A and 6B are designated. The description of the light collectors 7A and 7B will be omitted.

In the light source device 1, a set of first condensing devices 6A and 6B and a set of second condensing devices 7A and 7B are connected to each elliptical reflector 13, that is, a plurality of LEDs 11 via a support mechanism 8. By being rotated around a virtual axis passing over a light emitting surface (for example, an emission surface of an exterior material of LED 11 or a mounting surface of a substrate 12), a set of first light collecting devices 6A, 6B and a set of light collecting devices 6A, 6B and a set. The direction of the optical axis X2 of the condensed light collected by each of the second light collecting devices 7A and 7B can be 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 8a for supporting the support shaft 13b of each elliptical reflector 13. The support portion 8a is configured to rotatably support the support shaft 13b and to fix the support shaft 13b at a predetermined rotation position around the support shaft 13b, for example. The support mechanism 8 may have, for example, a lock mechanism that regulates and fixes the support shaft 13b to a predetermined rotation position around the support shaft 13b. Further, the support mechanism 8 is configured to rotate both of the set of first condensing devices 6A and 6B in synchronization with each other. Similarly, the support mechanism 8 is configured to rotate both of the set of second light collectors 7A and 7B synchronously.

Further, the support mechanism 8 is an angle adjusting mechanism (drive) (not shown) for rotating the first condensing devices 6A and 6B and the second condensing devices 7A and 7B around the support shaft 13b of the elliptical reflector 13. It is configured to be connectable with the mechanism). Although not shown, the support mechanism 8 may have, for example, a gear for rotating the elliptical reflector 13 around the support shaft 13b, a gear portion formed on the elliptical reflector 13, and the like.

In the support mechanism 13 described above, the support shaft 13b is provided so as to rotate around the light emitting surfaces of the plurality of LEDs 11, but the support shaft 13b may be provided at a position separated from the light emitting surfaces of the LEDs 11. FIG. 4 is a perspective view showing a modified example of the support mechanism 13 included in the first light collecting devices 6A and 6B of the light source device 1 according to the embodiment. As shown in FIG. 4, the support shaft 13b is provided on the side surface of the elliptical reflector 13 at a distance from the substrate 11, and the first light collectors 6A and 6B (second collection) are provided via the support mechanism 8. It is also possible to improve the stability of the rotational operation by providing the optical devices 7A, 7B) so as to be rotated around a virtual axis passing near the center of gravity of the elliptical reflector 13.

As shown in FIG. 1, the housing 9 is provided with an opening 9a on the side that emits irradiation light toward the UV ink as an irradiation target, and the opening 9a is a panel member 10 having transparency of ultraviolet rays. It is covered (see FIGS. 7 and 8). Further, as shown in FIGS. 1 and 2, a set 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 is provided in the housing 9. There is. The side mirrors 14 are arranged at both ends in the arrangement direction of the LEDs 11 and are fixed to the housing 9. As the side mirror 14, for example, a plane mirror is used. The support portion 8a of the support mechanism 8 is provided on the side mirror 14.

(Optical path for changing the irradiation distance of the light source device)
For the light source device 1 configured as described above, an optical path for varying the irradiation distance will be described. Hereinafter, only one set of the first light collecting devices 6A and 6B will be described, but the same applies to the set of the second light collecting devices 7A and 7B. 5 and 6 are schematic views for explaining an optical path for changing the irradiation distance of the light source device 1 according to the embodiment.

As shown in FIG. 5, one first condensing device 6A is arranged at position S1 and the other first condensing device 6B is arranged at position S2, and a set of first condensing devices 6A and 6B is arranged. The distances h are linearly symmetric with respect to the axis of symmetry X1. At this time, the distance between the one first condensing device 6A and the other first condensing device 6B (between the position S1 and the position S2) is 2h with the axis of symmetry X1 in between. Each of the first condensing devices 6A and 6B can rotate the optical axis X2 of the condensing light collected by the elliptical reflector 13 within a range of inclination angles θ1 to θ2 with respect to the direction of the axis of symmetry X1. , Supported by the support mechanism 8.

The condensed light collected by each of the first condensing devices 6A and 6B is an intersection C where the condensing light and the axis of symmetry X1 intersect, and the condensing light overlaps with each other. FIG. 5 schematically shows how the light flux cross section of the condensed light changes due to the direction of the optical axis X2 in each condensed light collected by the first condensing devices 6A and 6B. ..

As shown in FIG. 6, a set of first condensing devices 6A and 6B is rotated within a range of inclination angles θ1 to θ2 via a support mechanism 8, so that a set of first condensing devices 6A and 6B is rotated. The intersection C of the focused light of 6A and 6B moves in a predetermined range between the positions T1 and T2 along the axis of symmetry X1. In this way, the intersection C where the condensed lights of the first set of the first condensing devices 6A and 6B overlap moves within a predetermined range along the axis of symmetry X1, so that the illuminated condensing lights are combined. The position of the intersection C of light changes. As a result, the light source device 1 can change the irradiation distance so that the desired integrated light amount and the illuminance peak value are appropriately compatible with each other. At this time, the first condensing devices 6A and 6B have a condensing system in which the focal point F of the first condensing devices 6A and 6B is located between the positions T1 and T2 on the axis of symmetry X1 in FIG. Have.

Therefore, as shown in FIG. 6, assuming that the distance between the positions S1 and S2 of the first condensing devices 6A and 6B and the focal point F is R, the light source device 1 has a light source device 1.
{H / sin (θ1)} ≦ R ≦ {h / sin (θ2)} ・ ・ ・ (Equation 1)
It has a condensing optical system that satisfies the above conditions.

Further, when each of the first condensing devices 6A and 6B has an elliptical reflector 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√ ( ^a2 -b2) ≤{h / sin (θ2)} ... (Equation ² )
Has an ellipse that meets.

The light source device 1 is, for example, each first so as to have a desired irradiation distance set by the specifications of each printing device when the light source device 1 is assembled to a printing device using UV ink (not shown). The irradiation distance is adjusted by changing the direction of the optical axis X2 of the light condensing devices 6A and 6B and the second condensing devices 7A and 7B. At this time, although not shown, by connecting the angle adjusting mechanism and the support mechanism 8 separately provided from the light source device 1, the light source device 1 has each elliptical reflector 13 as a support shaft via the support mechanism 8. The irradiation distance is adjusted by rotating around 13b.

Further, the support mechanism 8 may be configured to rotate a set of the first light source devices 6A and 6B and a set of the second light source devices 7A and 7B in synchronization with each other, respectively. By rotating the light collecting devices 6A and 6B and the second light collecting devices 7A and 7B all at once, the irradiation distance of the light source device 1 can be easily adjusted. Further, the support mechanism 8 is configured to rotate both the set of the first light collecting devices 6A and 6B and the set of the second light collecting devices 7A and 7B in synchronization. The 1 condensing device 6A and 6B and the second condensing device 7A and 7B may be configured to be individually movable independently.

(Adjustment of irradiation distance of light source device)
FIG. 7 is a cross-sectional view showing a state in which the irradiation distance of the light source device 1 according to the embodiment is shortened. 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 lengthened. As shown in FIGS. 7 and 8, the light source device 1 directs the optical axis X2 of each of the focused light of the set of the first condensing devices 6A and 6B and the set of the second condensing devices 7A and 7B. By changing, the intersection C is moved along the axis of symmetry X1, and for example, the irradiation distance WD is configured to be adjustable within a range of about 30 [mm] to about 80 [mm]. Here, the irradiation distance WD is a distance along the axis of symmetry 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 required by a general printing apparatus is configured to be adjustable within a range of about 30 [mm] to about 80 [mm], but can be adjusted. It does not limit the range. The adjustable range of the irradiation distance WD may be appropriately set according to various manufacturing devices and the like to which the light source device 1 is applied.

FIG. 9 is a diagram showing an illuminance distribution when the irradiation distance of the light source device 1 according to the embodiment is shortened. FIG. 10 is a diagram showing an illuminance distribution when the irradiation distance of the light source device 1 according to the embodiment is lengthened. In FIGS. 9 and 10, the vertical axis indicates the illuminance [mW / cm ² ], the horizontal axis indicates the position [mm] from the axis of symmetry X1 (intersection point C), and for convenience, positive and negative are added around the axis of symmetry X1. Shown.

When the irradiation distance WD is 30 [mm], the light source device 1 narrows the illuminance distribution and obtains an illuminance peak value of less than 7,000 [mW / cm ² ] as shown in FIG. Further, in the light source device 1, when the irradiation distance WD is 80 [mm], as shown in FIG. 10, the illuminance distribution is wider than when the irradiation distance WD is short, but the illuminance peak is slightly less than 5000 [mW / cm ² ]. The value is obtained. Therefore, the illuminance peak value is appropriately secured within the range of the irradiation distance WD of about 30 [mm] to about 80 [mm].

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

The support mechanism 8 in the present embodiment is not limited to a configuration having a support portion 8a that supports the support shaft 13b of the elliptical reflector 13, and is appropriately modified to a configuration that rotatably supports the elliptical reflector 13. You may. For example, the support shaft 13b may be provided so as to extend to the outside of the housing 9.

The light source device 1 of the above-described embodiment changes the direction of the optical axis X2 of each focused light collected by each of the first condensing devices 6A and 6B (second condensing devices 7A and 7B) of the set. As described above, a support mechanism 8 for movably supporting each of the first set of light collectors 6A and 6B (second light source devices 7A and 7B) is provided, and is provided so as to overlap on the axis of symmetry X1. The intersection C where each focused light intersects the axis of symmetry X1 is moved along the axis of symmetry X1 via the support mechanism 8. Thereby, the irradiation distance WD of the irradiation light can be arbitrarily changed within a predetermined range.

Therefore, according to the light source device 1, the number of LEDs 11 is suppressed to an appropriate number to obtain a desired integrated light amount and illuminance peak value, thereby suppressing an increase in power consumption and having a plurality of specifications having different irradiation distances WD. It can be applied to manufacturing equipment such as printing equipment. Therefore, the versatility of the light source device 1 can be enhanced, the light source device 1 can be shared among printing devices having a plurality of types of specifications, and an increase in manufacturing cost of the printing device or the like can be suppressed. Further, according to the light source device 1, it is possible to finely adjust the irradiation distance WD via the support mechanism 8 as needed at the time of maintenance of the printing device or the like.

Further, the support mechanism 8 in the embodiment supports the set of first condensing devices 6A and 6B (second condensing devices 7A and 7B) so as to rotate synchronously. By rotating the two first condensing devices 6A and 6B (second condensing devices 7A and 7B) in synchronization in this way, the irradiation distance WD can be easily adjusted.

Further, the first condensing device 6A, 6B (second condensing device 7A, 7B) in the embodiment has an elliptical reflector 13 that condenses the light emitted by the LED 11. By using the elliptical reflector 13, it is possible to simply configure an optical element that collects the light emitted by the LED 11.

Further, the set of the first condensing devices 6A and 6B (second condensing devices 7A and 7B) in the embodiment are arranged at both ends of the elliptical reflecting mirror 13 and are reflected by the light emitted by the LED 11 and the elliptical reflecting mirror 13. The side mirror 14 is provided with a support portion 8a of a support mechanism 8 that has a side mirror 14 that reflects light and movably supports the elliptical reflector 13. As a result, the support mechanism 8 can be compactly configured and the light source device 1 can be miniaturized.

Further, in the set of the first condensing devices 6A and 6B (second condensing devices 7A and 7B) in the embodiment, the substrate 12 provided with the LED 11 is fixed to the elliptical reflecting mirror 13. As a result, the first light collecting devices 6A and 6B (second light collecting devices 7A and 7B) can be miniaturized.

The light source device 1 of the present embodiment includes two sets of condensing devices (four condensing devices), the first condensing devices 6A and 6B, and the second condensing devices 7A and 7B, respectively. The number of devices is not limited, and three or more sets of light collecting devices may be provided. Further, the light source device 1 is, for example, a condensing lens or the like on the optical axis X2 of the condensing light collected by the elliptical reflecting mirror 13 of the first condensing devices 6A and 6B (second condensing devices 7A and 7B). Other optical elements may be arranged, and the other optical elements move the intersection C of the focused light along the axis of symmetry X1 in conjunction with the movement of the elliptical reflector 13 via the support mechanism 8. It may be moved to do so. For example, after adding another reflecting surface as an optical element and further reflecting the condensed light collected by the elliptical reflecting mirror 13 on the other reflecting surface, the focal point of each reflected light is the intersection on the axis of symmetry X1. It may be configured so as to overlap with C.

Further, in the first condensing devices 6A and 6B (second condensing devices 7A and 7B) included in the light source device 1 of the present embodiment, the plurality of LEDs 11 on the substrate 12 provided with the plurality of LEDs 11 are not mounted. The surface side (the back side of the mounting surface) is arranged so as to face the axis of symmetry X1, but the configuration is not limited to this. FIG. 11 is a schematic diagram showing a modified example of the light source device according to the embodiment. For example, as shown in FIG. 11, the first condensing devices 6A and 6B (second condensing devices 7A and 7B) are mounted on the substrate 12 on the mounting surface side (light emitting surface side of the LED 11) on which a plurality of LEDs 11 are mounted. ) May face the axis of symmetry X1.

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

1 Light source device 6A, 6B 1st light condensing device (condensing device)
7A, 7B 2nd condensing device (condensing device)
8 Support mechanism 8a Support part 11 LED (light emitting element)
13 Elliptical reflector (optical element)
13a Reflective surface 14 Side mirror X1 symmetry axis X2 optical axis C intersection point F focus WD irradiation distance

Claims (5)

A set of condensing devices having a light emitting element and an optical element having a focal point that condenses the light emitted by the light emitting element at a position distant from the light emitting element, and arranged line-symmetrically with respect to the axis of symmetry. When;
With a support mechanism that rotatably supports each of the set of condensing devices so as to change the direction of the optical axis of each condensing light collected by each of the set of condensing devices;
Equipped with
The set of condensing devices is provided so that the intersections of the condensing lights intersecting the axis of symmetry overlap on the axis of symmetry, and the position closest to the condensing device at the intersections is T1. When the position farthest from the light collector is T2, the intersection 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. The intersection is moved along the axis of symmetry via the support mechanism .
The support mechanism is a light source device that rotatably supports each of the set of light collectors around an axis passing near the center of gravity of the optical element . The support mechanism supports the set of light collectors to move synchronously.
The light source device according to claim 1. The optical element is an elliptical reflector that collects the light emitted by the light emitting element.
The light source device according to claim 1 or 2. The set of condensing devices has a reflecting member arranged at both ends of the elliptical reflecting mirror to reflect the light emitted by the light emitting element and the light reflected by the elliptical reflecting mirror.
The support mechanism has a support portion that movably supports the elliptical reflector, and the support portion is provided on the reflection member.
The light source device according to claim 3. The set of condensing 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 or 4.

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