KR20060051201A - Illuminating device using light source device - Google Patents

Abstract

The present invention relates to a lighting apparatus using a light emitting device, and more particularly, a plurality of focusing lens set unit consisting of a light emitting device and a lens combination for collecting light emitted from the light emitting device at a predetermined angle toward a single condensing point. A light transmission unit made of an optical fiber or an optical waveguide having an entrance surface at the condensing point and an exit surface on the opposite side of the focusing lens set part at a predetermined distance, and light connected to and emitted from the exit surface of the light transmission unit; It relates to a lighting apparatus using a light emitting element comprising a light irradiation unit for irradiating a predetermined area. That is, when a light emitting element (a laser diode or an LED) is used as a light source and focuses on the incident surface of the optical fiber or the optical waveguide at a point spaced apart from the light generated therein, the incident light is totally internal. It is related to the lighting device that can concentrate the lighting where it is needed by proceeding the inside of the optical fiber or optical waveguide by the principle of reflection, etc. By using the light emitted from one or more light emitting elements efficiently, the lighting is effectively provided to a long distance or a large area of more than 1Km, and the light irradiation unit comprises a projection lens set of a reverse zoom lens type. In conjunction with an external device using a zoom lens, etc., the light use efficiency can be maximized.

Fiber optic, laser diode, LED, condensing, zoom, electric, lighting

Description

Lighting device using light emitting device {ILLUMINATING DEVICE USING LIGHT SOURCE DEVICE}

1 is a schematic diagram showing an overall configuration of an embodiment of a lighting device using a light emitting device of the present invention.

2 is a perspective view illustrating a main body part in which a focusing lens set part and a light transmitting part are disposed in a lighting apparatus using a light emitting device according to the present invention;

Figure 3 is an enlarged cross-sectional view showing the structure of an embodiment of the focusing lens set in the lighting device using the light emitting device of the present invention.

Figure 4 is an enlarged cross-sectional view showing an embodiment structure of the light transmitting unit in the lighting device using the light emitting device of the present invention.

5 is a cross-sectional view showing the structure of a projection lens set as an embodiment of the light irradiation unit in the lighting apparatus using the light emitting device of the present invention.

<Description of Symbols for Main Parts of Drawings>

1 main body 2 focusing lens set

3: light transmitting part 4: light irradiation part (or projection lens set part)

23: optical fiber fixing plate 26a ~ 26d: (focusing lens set) contact surface

27: hole for inserting the focusing lens set

30: focusing sleeve 33: light emitting element

34: (for light collection) concave lens 35: first composite lens

36: second composite lens 42: (for optical fiber protection) metal sleeve

43: optical fiber 52: electric motor

53: reducer and clutch box 54: lens feed shaft

55: 2nd irradiation part convex lens 56: 1st irradiation part convex lens

The present invention relates to lighting in a specific area of a short distance or long distance, and uses a plurality of light emitting devices, in particular solid state light emitting devices to realize low power consumption and miniaturization of the device, selectively selecting one or more light sources for appropriate lighting In this case, the light generated from each light source can be integrated and transmitted by using optical transmission media such as optical fiber or optical waveguide, and then projected in the desired direction so that light can be efficiently supplied to a specific area to illuminate a certain area. It was.

Conventionally, xenon lamps, halogen lamps or mercury arc lamps are mainly used for camera lighting, stage lighting, night lighting, and surveillance camera lighting using CCD or CMOS, which are heavy and generate a large amount of heat during light generation. Inevitably, while the power consumption is inevitably high, the light is emitted in a wide angle in which light is emitted at a wide angle, and thus the amount of light reaching the subject to be photographed is extremely limited, and its lighting efficiency is very low. In order to improve this, there are lamps with a reflector or parabolic reflector orienting a specific direction inside the lamp, but this also does not show satisfactory performance. Especially, when lighting a long distance, the lighting effect is drastically reduced due to the characteristics of scattering light. . There are also some medical devices that use fiber optics attached to this type of lamp, but they also use a single large light source, ranging from tens of watts to hundreds of watts, and use the fiber as a means of drawing the light emitted therefrom. Only the above-mentioned problems cannot be solved. Therefore, in the present invention, low power is used for efficient lighting, heat emission is low, and the light use efficiency is very high by using a large number of easy-condensing elements, and data from external devices such as a camera is received. On the basis of this, a lighting device that allows the viewing angle to be interlocked with an external device by adjusting the divergence angle and focus of light by moving a lens connected to an electric motor is proposed.

The present invention has attempted to make a small, high efficiency, low power lighting device, and to create a lighting device that can be efficiently controlled at a short distance as well as a long distance. Therefore, a small light emitting device is used as a light source. There are other physical limitations that can not provide sufficient lighting, so it is possible to use a plurality of light sources (light emitting elements), but only the required number of light sources (light emitting elements) can be used depending on the purpose. In the case of using a plurality of light sources (light emitting elements), each light emitted from these light sources is integrated by using an optical fiber or an optical waveguide, and thus the exit surface of the optical fiber or optical waveguide can be used as a new single light source. The present invention relates to a lighting apparatus using a light emitting device proposed to pass through a reverse zoom projection lens set (light irradiation unit) using an electric motor in order to efficiently use the same external equipment.

The present invention

A plurality of focusing lens set units formed of a light emitting device and a lens combination for collecting light emitted from the light emitting device so as to be incident at a predetermined angle toward one constant focusing point;

A light transmission unit comprising an optical fiber or an optical waveguide having an entrance surface at the condensing point and an exit surface on the opposite side of the focusing lens set at a predetermined distance from the focusing lens set unit; And,

It provides a lighting device using a light emitting element, characterized in that it comprises a light irradiation unit connected to the emission surface of the light transmitting unit and irradiates light emitted from the predetermined area.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus using a light emitting element, and comprises a plurality of focusing lenses comprising a combination of lenses for collecting light emitted from the light emitting element 33 and the light emitted from the light emitting element 33 at a predetermined angle toward a single condensing point. A light transmitting part comprising an optical fiber 43 or an optical waveguide having a set portion 2 and an incident surface 41 at the condensing point and an exit surface 46 on the opposite side of the set lens 2 at a predetermined distance from the focusing lens set portion 2. (3) and a light irradiation part 4 connected to the exit surface 46 of the light transmitting part 3 and irradiating light emitted therefrom to a predetermined region.

A specific embodiment thereof is shown in FIG. 1, and the light emitting device 33 may correspond to various known light emitting devices, and in particular, an LED, a laser diode, or various laser generating devices may be applied thereto. Preferably, the use of a solid state light emitting device including an LED or a laser diode is good for the efficient use and miniaturization of equipment cost and power, and the generated light has good directionality. In addition, in the case of using the illumination device of the present invention as an illumination device of a night surveillance camera, the light emitted from the light emitting element is infrared, which is preferable because the object to be monitored does not feel dimming to the illumination.

In addition, the lens combination of the focusing lens set 2 may use any type of lens combination in the case of collecting light (especially infrared rays) generated from the light emitting device so as to be incident at a predetermined angle toward a single focusing point. Possible, the light collecting point does not necessarily mean a single point, but means an area having a predetermined area of the incidence surface that can be guided by the optical fiber. More specifically, as shown in FIG. 1 and FIG. 3, a concave lens 34 sequentially arranged in a row on an optical path in order to capture light emitted from the light emitting element 33. , A first compound lens 35, a second compound lens 36, and spacers 37, 38, and 39 for adjusting a focal length of each lens, wherein the compound lens is illustrated. It means a known composite lens used for collecting light composed of two pairs of lenses.

More specifically, as shown in FIG. 3, the focusing lens set part 2 is a hollow housing, a light emitting device 33 inserted into and fixed to one end of the housing and supported by a focusing sleeve 30, and the light emitting device. In order to capture the light emitted from 33, the concave lens 34, the first compound lens 35, the second compound lens 36, and the focus of each of the lenses positioned in the optical path are sequentially spaced therefrom. A first spacer 39, a first compound lens 35 and a second compound lens 36 positioned at an edge between the concave lens 34 and the first compound lens 35 to adjust and secure the lens to the housing. And a second spacer 38 located at an edge between the second spacer 38, a second compound lens 36 and a third spacer 37 located at an edge between the other end of the housing. Can be. Specific examples of the first spacer 39 may include a ring as shown, and specific examples of the second spacer 38 may include a spacer as illustrated, and the third spacer ( A specific example of 37) includes a stopper as shown.

Through this, all of the light emitted from the light emitting device is refracted through the lens combination to be introduced into the entrance surface of the optical fiber, and even when entering the entrance surface of the optical fiber, the entrance angle is passed through the optical fiber to the exit surface. Make sure you have an angle to exit. That is, the angle must be less than the numerical aperture NA of the optical fiber so that light entering through the incident surface can exit to the optical fiber exit surface.

Thus, in order to efficiently introduce the light generated from the light emitting element 33 into the optical fiber, it is necessary to precisely adjust the condensing and entrance angles. Preferably, the focusing lens set part 2 and the incident surface 41 of the optical fiber are fixed. Since it is preferable to fix to have a geometric relationship, the present invention may further include a main body (1) for this purpose. That is, the lighting device using the light emitting device of the present invention comprises a first fixing bracket for fixing the plurality of focusing lens set portion 2 to direct one focusing point, the first fixing bracket to the incident surface of the light transmitting part to the focusing point It may be configured to further include a main body portion (1) consisting of a support bracket for connecting the two fixed brackets and the two fixed brackets and maintain a constant interval.

A specific embodiment thereof is as shown in FIG. 2. That is, the first fixing bracket of the main body portion 1 has a plurality of holes 27 and focusing lens set portions 2 corresponding to the respective focusing lens set portions so as to mount the plurality of focusing lens set portions 2 to the appropriate inclination angles. The second fixing bracket is formed of a contact surface 26a to 26d to be coupled with each other, and the second fixing bracket has an optical fiber fixing plate 23 for fixing one end having an incident surface 41 of the light transmitting part 3 and a fastener 24 to clamp the same. ), And can be configured in the form of a coupler 25 for fixing the main body portion 1 to a predetermined frame between the supports. That is, the main body portion 1 may be used to be attached to a pillar or a wall surface, or a mechanism for rotating the lighting device up, down, left, or right, such a structure corresponds to the predetermined frame.

In addition, the body portion 1 may be made of a variety of known materials, and preferably made of copper, aluminum, copper alloy or aluminum alloy, which is excellent in heat transfer efficiency and lightweight.

In addition, the light transmitting unit 3 may be a variety of known optical fibers or optical waveguides. Preferably, the optical transmission unit 3 may be made of a single-mode optical fiber because it is easy to manufacture by securing a large cross-sectional size of the incident surface. In addition, in order to increase the efficiency by reducing the amount of light reflected when the incident light incident on the incident surface, it is preferable that the anti-reflective coating treatment on the surface of the optical fiber incident surface of the light transmitting portion or the surface of the incident surface of the optical waveguide.

In addition, the optical fiber of the light transmitting part 3 further includes a metal sleeve 44 coupled to the outer peripheral surface of the incident surface end to protect the incident surface 41, and to the outer peripheral surface of the end for protecting the exit surface 46. It may be configured to further include a metal sleeve (44) having a step (45) to engage and narrow the diameter toward the exit surface. Specific examples thereof are as shown in FIG. 4. In particular, the reason for using the two-stage metal sleeve 44 having a step on the exit surface is to prevent the interference between the lens and the optical fiber does not occur when coupling with the light irradiation unit.

As such, the light transmitted through the optical fiber or the optical waveguide may irradiate light to a predetermined area where illumination is required through a light irradiation unit 4 made of a conventional light irradiation device formed by various known methods, and preferably In order to increase light control efficiency by intensively irradiating light to an area, the light irradiator 4 is sequentially arranged in a line on an optical path as shown in FIG. 5, and the relative distance between lenses on the optical path is adjusted. It is desirable to be formed by combining two or more lenses that are configured to enable this and adjust the focus or radiation angle. More preferably, it is more effective to configure a combination of lenses that control both the focus and the radiation angle.

The combination of the lens can be configured in any form as long as the angle or focus can be adjusted so that the light emitted from the exit surface (corresponding to almost a point light source) is dimmed (radiated) only in a certain area. The lens of the irradiator consists of a) the first irradiator convex lens 56 and the second irradiator convex lens 55 as shown in FIG. 5, or instead b) diverges, which is a combination of convex-concave-convex lenses. The first 'irradiation convex lens for collecting light, the second' irradiation concave lens for adjusting the divergence angle of the light collected by the first 'irradiation convex lens, and the third' irradiator for collecting light emitted from the second 'irradiation concave lens A convex lens may be used, or a lens combination of an inverse zoom lens method in which the front and rear sides of the zoom lens are changed as described above is also possible. In addition, in order for the lens combination to adjust the wide angle and the focus, at least one or more lenses of the lens combinations must be moved relative to the relative lens. Therefore, the lens combination is connected to one or more of the lenses of the light irradiation part and transfers the lens along the optical path. 5 is configured as shown in FIG. 5 to further include a lens feed shaft 54 and an electric motor 52 connected to the lens feed shaft 54. In addition to this, it may further include a reducer and a clutch box 53 to facilitate the precise control and transfer between the electric motor 52 and the lens feed shaft (54). Such additional configuration may be configured by applying various known devices.

In addition, since the necessity of the lighting device is to acquire an image through the camera, light (infrared rays) may be applied to a camera that is photographing the focus and the wide angle of the lighting device or to a part which is actually photographed in conjunction with the camera and the lens installed therein. ) Is preferable because the image quality can be increased and energy can be efficiently used. That is, the light irradiation unit 4 further includes a driving unit for adjusting the relative distance between the lenses, a control unit for controlling the driving unit, and a camera for photographing a subject illuminated by the illumination device, wherein the control unit is configured to photograph the camera. Each lens may be configured to move through the driving unit so that the illuminance is in a proper state. That is, the controller analyzes illuminance data of the image photographed by the camera and moves the lens through the driving unit so that light such as infrared light is concentrated only on the object to be photographed, thereby maintaining the optimal illuminance of the photographed screen. The screen can be identified.

In addition, when the light irradiation unit 4 further includes a camera including a driving unit for adjusting the relative distance between the lenses, a control unit for controlling the driving unit, and a zoom lens for photographing a subject illuminated by the illumination device. The lens may move each lens so that dimming is performed on an actual area corresponding to an imaging area of the imaging screen of the camera. As a specific example of this, a reverse zoom lens having a wide-angle control at a ratio with a zoom lens of a camera is provided in the light irradiation unit so that the light irradiation unit zooms in or out at the same ratio in proportion to the relative amount of the camera's zoom in or zoom out. The dimming can be performed only on the actual area corresponding to the imaging area of the imaging screen. Of course, in addition to such a method it can be performed through a variety of known matching methods.

Hereinafter, specific embodiments will be described in detail with reference to the accompanying drawings.

Fig. 2 shows a main body portion 1 for mounting a plurality of focusing lens set portions 2, in which the focusing lens set portion 2 is inserted into the hole 27 of the main body, and the focusing lens set portion 2 and the main body portion 1 are mounted. The contact surfaces 26a to 26d at appropriate angles are formed between the optical fiber fixing plate 23 for fixing the optical fiber of the light transmitting unit 3, the fixing screw 24 for clamping the optical fiber, and the main body. 3 screws 25 in the lower part of the main body to be fixed to the mechanism to move left or right),

3 includes a light source (light emitting element) 33 which is supported by a focusing sleeve 30 therein with a focusing lens set portion 2 and includes a concave lens 34 for collecting light emitted from the light source. 1 compound lens 35, second compound lens 36 and ring 39, spacer 38, the stopper 37 to adjust the focus of each lens using the angle adjustment and fixing screw 31 Is fixed to the main body at this time there is a portion 32 in contact with the main body,

4 is a light transmission part made of an optical fiber of the light transmission part 3, and the optical fiber 43 is protected by the incidence surface 41 and the two-stage metal sleeves 44 and 45 which are protected and fixed by the metal sleeve 42. Will have a fixed exit surface 46

5 is a projection lens set that is an example of the light irradiation unit 4, and three screws 51 which can fix the two-stage fixing sleeves 44 and 45 on the optical fiber exit surface side and the focus and emission angles of the light emitted from the optical fiber It includes a first irradiator convex lens 56, a second irradiator convex lens 55 for adjusting the operation, according to the lens feed shaft 54 and the external signal for moving the second irradiator convex lens 55 to the left and right The electric motor 52, the reducer box, and the clutch 53 are included.

First, light having a certain angle is emitted from the light source (light emitting device) 33 by an external power source, and the light is changed to an angle intended by the apparatus while passing through the concave lens 34 and then enters the first composite lens 35. do. The light emitted from the first composite lens becomes almost similar parallel light and is incident on the second composite lens 36. The second composite lens is connected to the main body 1 by the metal sleeve 42 at a point about 100 mm apart. The focal point is adjusted to focus on the incident surface of the fixed optical fiber 43. The light emitting device has a unique light emission angle according to the type, maker or rated capacity of the light emitting device, and the light emitting area is different so that changing the device requires adjusting the focal length accordingly. In the device, the focusing sleeve 30 plays a role, and when a high output element of 1W or more is used, severe heat generation is expected, so that the heat can be easily transferred to the main body through the focusing sleeve and the focusing lens set. To prevent overheating. When the focusing lens set portion is mounted on the main body portion, the contact surfaces 26a to 26d of the main body portion and the focusing lens set portion have a slight angle. This angle should be less than the numerical aperture (NA) of the optical fiber so that the light entering through the incidence surface is optical fiber. You can move on to the exit side of. In addition, the surface (body side: 26a to 26d, focusing lens side: 32) where the two objects meet each other to maintain a proper inclination angle, the light emitted from each of the focusing lens set 2, the optical fiber holder 22 and the fixing plate 23 The light is collected in the vicinity of the incident surface 41 of the optical fiber 43 fixed therebetween, and fine adjustment can be performed using the angle adjustment and the fixing screw 31 on the focusing lens set side.

In the case of optical fiber, fused silica, glass, or quartz optical fiber is used rather than plastic optical fiber in case of using a high output element, which is inevitably necessary when making a small focus to enter the light into the optical fiber. Since the concentration of light occurs on the incident surface and part of the light is absorbed by the optical fiber in the form of heat, and thus the temperature of the optical fiber itself rises, in the plastic optical fiber, a molten state occurs in the incident surface, thereby rapidly decreasing the light incident efficiency.

Since there are various types of optical fibers in the market, the present invention avoids the use of bundle optical fibers and uses single mode optical fibers, which have a core diameter of several microns to several tens of microns for focusing lenses. This is because the incident loss is much larger than the spot size that the set can produce. Efficient use of light is very important because it is intended to achieve maximum lighting effect with minimum power consumption. For this purpose, the optical fiber must use a well polished surface and also have an anti-reflective coating.

The emission surface 46 of the optical fiber is inserted into the projection lens set, which is an example of the light irradiation unit 4, and is fixed using the fixing screw 51 at an appropriate distance from the convex lens 56 of the first irradiation unit. The two-stage metal sleeves 44 and 45 are used on the optical fiber side to prevent the surface of the convex lens and the first irradiating portion from touching each other. The light passing through the exit surface of the optical fiber is spread at a predetermined angle from the first convex lens of the projection lens set and the second convex lens 55 is moved left and right to determine the emission angle of the light. When the light's emission angle is at its maximum and can no longer travel to the right, its emission angle is minimum. When the moving distance of the second convex lens is about 20 mm, the emission angle of the light is ㅁ 0.5 ㅀ to ㅁ 23 이며. By combining the distance to the illumination area and the angle of radiation of the light, it is possible to provide adequate illumination, which allows the light emitted from multiple light sources to be treated as if it were a single light source. In the second convex lens, the rotational force from the electric motor 52 is transmitted to the lens feed shaft 54 through the reduction gear box 53 to move left and right, and when used with an electric zoom lens. When the zoom ratio or preset value is transmitted from the zoom lens side, the DA motor can be used to properly control the electric motor, thereby enabling more efficient lighting. The zoom lens of the device adjusts the viewing angle by changing the angle of light incident from the outside to the device side, while the device adopts a reverse zoom method of adjusting the angle of light emitted from the device side to the outside according to the viewing angle.

As described above, according to the lighting apparatus using the light emitting device of the present invention, by using a small, low power, high efficiency light emitting device and by selectively enabling a plurality of light sources, the light efficiency of the lighting device is increased, and the low power is used. It can be installed anywhere by miniaturization and light weight, and it is possible to integrate and transmit these lights by using optical transmission media such as optical fiber or optical waveguide, so as to minimize the loss of light, and to transmit remotely. By controlling the angle and focus of the light using a motor, etc., it is possible to link with external equipment such as a camera to provide the most appropriate lighting for a given situation.

In addition, by supplying the light emitting surface as a concentrated light source to assume a point light source there is an advantage to facilitate subsequent work such as lens design of the optical scanning part.

The present invention described above is not limited to the detailed description, examples, and drawings of the above-described invention, and various one of ordinary skill in the art without departing from the spirit and scope of the present invention described in the claims below. Of course, modifications and variations are also included within the scope of the present invention.

Claims (13)

A plurality of focusing lens set units comprising a light emitting device and a lens combination for collecting light emitted from the light emitting device to be incident at a predetermined angle toward a single condensing point; A light transmission unit comprising an optical fiber or an optical waveguide having an entrance surface at the condensing point and an exit surface on the opposite side of the focusing lens set at a predetermined distance from the focusing lens set unit; And, And a light irradiation unit connected to an emission surface of the light transmitting unit and irradiating light emitted from the light emitting unit to a predetermined region. The method of claim 1, The light emitting device is an LED, a laser diode or a laser generating device, the light emitted from the lighting device using a light emitting device, characterized in that the infrared. The method of claim 1, The lens combination includes a concave lens, a first compound lens, a second compound lens, and a spacer for adjusting a focal length of each lens, which are sequentially arranged in a row on an optical path to collect light emitted from the light emitting device. Lighting device using a light emitting element, characterized in that. The method of claim 1, The focusing lens set part includes a hollow housing, a light emitting device inserted into and fixed to one end of the housing and supported by a focusing sleeve, and a concave lens positioned in an optical path sequentially spaced therefrom to collect light emitted from the light emitting device. And a first spacer, a first compound lens positioned at an edge between the concave lens and the first compound lens to adjust the focus of each of the first lens, the second compound lens, and to fix the lens to the housing. Illumination using a light emitting device comprising a spacer composed of a second spacer positioned at the edge between the second composite lens, a third spacer positioned at the edge between the second composite lens and the other end of the housing Device. The method of claim 1, A first fixing bracket for fixing the plurality of focusing lens sets to direct one condensing point, a second fixing bracket for fixing the incident surface of the light transmitting part to the condensing point, and the two fixing brackets and maintaining a constant interval Lighting device using a light emitting element further comprises a main body consisting of a support. The method of claim 5, The first fixing bracket of the main body portion is formed of a plurality of holes corresponding to each focusing lens set portion and a contact surface for engaging the focusing lens set portion with an appropriate inclination angle to mount the plurality of focusing lens set portions, and the second fixing bracket is optical Illumination device using a light emitting element, characterized in that the transmission part is made of an optical fiber and the optical fiber fixing plate for fixing one end having an incident surface of the optical fiber and a fastener fastening it, and the support between the support and the coupling device for fixing the main body to a predetermined frame . The method of claim 5, The main body is a lighting device using a light emitting element, characterized in that made of copper, aluminum, copper alloy or aluminum alloy. The method of claim 1, The optical fiber of the light transmitting unit is made of a single mode optical fiber, the illumination device using a light emitting element, characterized in that the antireflective coating treatment on the surface of the incident surface of the optical fiber or optical waveguide. The method of claim 1, The optical fiber of the light transmitting part further comprises a metal sleeve coupled to the outer peripheral surface of the incident surface end and a metal sleeve coupled to the outer peripheral surface of the exit surface end and having a step diameter narrowing toward the exit surface. The method of claim 1, The light irradiation unit is disposed in a row in a row on the optical path, and configured to adjust the relative distance between the lenses on the optical path to form a combination of two or more lenses to adjust the focus or the radiation angle using a light emitting device, characterized in that Lighting equipment. The method of claim 10, The lens of the light irradiation part may include a) a first irradiation part convex lens and a second irradiation part convex lens, or b) a first 'irradiation part convex lens for collecting emitted light, and a divergence angle of light collected by the first' irradiation part convex lens. A second 'irradiation concave lens for adjusting and a third' irradiation convex lens for collecting light emitted from the second 'irradiation concave lens, And an electric motor connected to each of at least one of the lenses of the light irradiating part and transferring the lens along the optical path, and an electric motor connected to the lens feeding axis. The method of claim 10, The light irradiation unit further includes a driving unit for adjusting the relative distance between the lenses, a control unit for controlling the driving unit, and a camera for photographing a subject illuminated by the illumination device, wherein the control unit is configured to optimize the imaging illumination of the camera. Illumination device using a light emitting element, characterized in that for moving each lens through the drive unit. The method of claim 10, The light irradiation unit further includes a camera including a driving unit for adjusting the relative distance between the lenses, a control unit for controlling the driving unit, and a zoom lens for photographing a subject illuminated by the illumination device, wherein the control unit is configured to capture an image of the camera. An illumination device using a light emitting element, characterized in that for moving the respective lens through the drive unit so that light is made to the real area corresponding to the imaging area of the.

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