KR20180044676A - Light source unit - Google Patents

Abstract

The present invention provides a light source device. The light source device includes a light source for outputting blue light in a first direction, a mirror disposed obliquely to the first direction so that the blue light moves in a second direction intersecting with the first direction, a plurality of lenses, and a fluorescent part that changes the wavelength of the blue light that has passed through at least one of the plurality of lenses and reflects light of the changed wavelength so as to pass through the plurality of lenses along a direction opposite to the second direction. A more compact light source unit can be provided.

Description

[0001] LIGHT SOURCE UNIT [0002]

The present invention relates to an image projection apparatus having a light source unit and outputting an image.

As the information age rapidly develops, the importance of a display device that realizes a large screen is emphasized. As an example of a device that implements such a large screen, there is a projector having a function of enlarging and projecting an image.

As the performance of projectors becomes more important in recent years, various new attempts have been made in terms of hardware or software. For example, there is an attempt to implement a projector using a laser diode (LD), a light emitting diode (LED), an organic EL (OLED), and a phosphor as light sources.

In general, the light source unit forms light including various colors by using blue light. However, in order to obtain the blue light, a separate blue light path is required, so a space inside the light source unit for forming the path of the blue light is required.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a more compact light source unit.

In order to achieve the object of the present invention, a light source unit according to an embodiment of the present invention includes a light source for outputting blue light in a first direction, a light source for emitting blue light in a second direction crossing the first direction, A wavelength of the blue light having passed through at least one of the mirror, the plurality of lenses, and the plurality of lenses arranged obliquely to the first direction is changed, and the light whose wavelength is changed is changed along the direction opposite to the second direction And a fluorescent portion that reflects the plurality of lenses to pass therethrough.

In one embodiment of the present invention, each of the plurality of lenses is divided into a first region through which the blue light passes, an edge region adjacent to the edge region, and a second region surrounding the first region and through which light having the changed wavelength passes, The mirror is arranged to overlap with at least one first region of the lens, and the blue light can be transmitted to the fluorescent portion by using the refractive index of the lens for outputting light.

In one embodiment of the present invention, the first lens through which the blue light and the wavelength-changed light pass through the first lens includes a first surface on which the blue light and the wavelength-changed light are incident or output, And a refractive index of one region of the first surface on which the blue light is incident may be formed differently from a curvature of the remaining region. Therefore, the refractive index of one lens can be formed differently, so that the optical path can be formed without additional optical configuration.

According to the present invention, since the optical path of the blue light output from the light source and the output path of the changed wavelength are implemented by one optical configuration, the optical configuration for outputting light of various wavelengths using blue light can be minimized.

Further, when the laser light is output to the blue light laser array, the refractive index of a specific region of the lens can be formed differently from that of other regions, and the blue light can be more accurately transmitted to the fluorescent portion without any additional optical configuration.

Therefore, since the volume of the light source unit is minimized, the volume and weight of the image display device including the light source unit can be minimized.

1 is a conceptual view showing an operation of an image projection apparatus having an optical apparatus according to an embodiment of the present invention.
FIGS. 2A and 2B are perspective views of the image projection apparatus of FIG. 1 viewed from the front and rear, respectively.
3 is an exploded view of the image projection apparatus of Fig.
4A to 4C are conceptual diagrams illustrating components of a light source unit according to an embodiment of the present invention.
5A to 5C are conceptual diagrams illustrating a light source unit including a light source and a relay lens according to another embodiment of the present invention.
6A and 6B are conceptual diagrams illustrating a light source unit for changing an optical path through a condenser lens according to another embodiment of the present invention.
7 is a conceptual diagram for explaining a light source unit including a total reflection part according to another embodiment.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprising" or "comprising" or the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

1 is a conceptual view showing an operation of an image projection apparatus having an optical apparatus according to an embodiment of the present invention.

The image projection apparatus 100 of the present invention projects a large-sized image on the screen S in a state in which it is placed close to the screen S in a short distance.

The image projection apparatus 100 may be a projector that implements an image using light generated by a light source and projects an implemented image, such as a projector for enlarging and projecting an image as shown in the figure. Hereinafter, the image projection apparatus 100 related to the present invention will be described with reference to a projector. However, the image projection apparatus 100 is not limited to this, and can be applied to, for example, a projection apparatus embedded in a projection television or the like. Hereinafter, the present invention will be described on the basis of a projector.

The image projection apparatus 100 is disposed adjacent to the lower end side (or the upper end side) of the screen S and is configured to image an image of a large screen on the screen S in this state.

Hereinafter, an image projection apparatus capable of implementing such an operation will be described as an example.

FIGS. 2A and 2B are perspective views of the image projection apparatus 100 of FIG. 1 viewed from the front and rear, respectively, and FIG. 3 is an exploded view of the image projection apparatus of FIG.

The components shown in Figs. 2A and 2B are not essential, and an image projection apparatus 100 having components having more or fewer components may be implemented.

Referring to these drawings, an appearance of the image projection apparatus 100 is formed by upper and lower cases 111 and 112. Various optical components and electronic components are embedded in the space formed by the upper and lower cases 111 and 112. At least one intermediate case may be additionally disposed between the upper and lower cases 111, 112.

The operation unit 113 may be disposed on the upper case 111. The operation unit 113 can be employed in any manner as long as the user operates in a tactile manner with a tactile impression.

The operation unit 113 receives a command for controlling the operation of the image projection apparatus 100. In a functional aspect, the operation unit 113 can be used for inputting a menu such as start, end, and the like.

The operation unit 113 may be operated to perform a zoom-in or zoom-out operation on an image projected from the image projection apparatus 100. The operation unit 113 may be operated to focus an image projected from the image projection apparatus 100. [

An air flow unit 114, an interface 115, a power supply unit 116, and the like may be disposed in the lower case 112.

The air flow unit 114 includes a plurality of through holes to allow air to flow into the image projection apparatus 100. Thereby enabling cooling of the image projection apparatus 100 using forced convection.

The interface 115 is a path for allowing the image projection apparatus 100 to exchange data with an external device. The image data corresponding to the image to be projected by the image projection apparatus 100 through the interface 115 can be inputted from the outside. Referring to this figure, the interface 115 includes a connection terminal that can be electrically connected to an electronic device, for example, a computer, a DVD player, etc. that can supply video or audio data.

The power supply unit 116 is mounted on a lower case 112 for supplying power to the image projection apparatus 100. The power supply unit 116 may be configured to receive, for example, an alternating current household power supply and convert the power supply into a direct current power supply. However, the configuration of the power supply unit 116 is not limited thereto, and may be a rechargeable battery and may be detachably coupled for charging or the like.

The sound output unit may be implemented as a speaker in any one of the upper and lower cases 111 and 112 and an antenna for receiving broadcast signals may be additionally disposed.

According to the drawing, the projection unit 117 is formed to project an image from the upper surface of the upper case 111 to the outside. The projection unit 117 includes, for example, a projection system 140 (or a projection optical system, see Fig. 3) in which a plurality of lenses and mirrors are arranged at predetermined intervals. The projection unit 117 may be formed such that the distance between the plurality of lenses and the mirror is adjusted by the operation of the operation unit 113. [ The zooming or focusing function of the image projection apparatus 100 can be realized.

The image projection apparatus 100 includes a light source unit that emits light. The light source unit of the present invention includes a light source that emits blue light, and a path for transmitting a blue light and a light path for a plurality of lights having different wavelengths from blue light are formed to be the same. Hereinafter, a specific structure of the light source unit will be described.

3, the image projection apparatus 100 may include the upper case 111, the lower case 112, the control circuit board 121, the light source device 300, and the conversion device 140 have.

The control circuit board 121 may be mounted on the lower case 112. The control circuit board 121 may be configured as an example of a control unit for operating various functions of the image projection apparatus 100.

The light source unit 300 may be mounted on the lower case 112. The light source unit 300 refers to a system of optical components for realizing an image of an object using reflection or refraction of light in the image projection apparatus 100. A structure (not shown) in which the light source unit 300 can be assembled may be additionally disposed between the light source unit 300 and the lower case 112.

The image converting apparatus 140 is configured to form an image using light incident from the light source unit 300. For example, the image conversion device 140 may be an optical system that performs color conversion or color separation on the generated light, and converts the light into an image using a display device. And is enlarged and projected on a screen output from the image conversion apparatus 140. [

The light source unit 300 has a compact structure in which blue light and wavelength-changed light are output to one component. Hereinafter, the structure of the light source unit 300 according to various embodiments of the present invention will be described.

4A to 4C are conceptual diagrams illustrating components of a light source unit according to an embodiment of the present invention.

The first light source unit 310 according to the embodiment of FIG. 4A includes a light source unit 331, a mirror 312, a collimator 313, a condenser lens unit 314, and a fluorescent wheel 315.

The lens unit 316, the collimator 313, and the fluorescent wheel 314 are sequentially arranged with respect to the center axis (z axis). And a light source 311 for outputting light in the x-axis direction perpendicular to the central axis (z-axis) is disposed. The light source 311 is formed in an area off the z-axis. The light source 311 may be a blue LD that outputs blue light.

The mirror 312 is disposed adjacent to the light source 311. The mirror 312 is disposed at an angle of about 45 degrees with respect to the x-axis, and changes the movement path of the light output in the x-axis direction. That is, the light output in the x-axis direction by the mirror 312 can be changed by about 90 degrees (in the vertical direction) by the mirror 312. Accordingly, the light output in the x-axis direction moves along the z-axis direction.

The mirror 312 is disposed between the collimator 313 and the lens unit 316. The light reflected by the mirror 312 to move in the z-axis direction passes through the first to third lenses 313a, 313b, and 313c of the collimator 313. It is preferable that the first to third lenses 313a, 313b, and 313c are aspherical lenses.

The first to third lenses 313a, 313b, and 313c may be partitioned into a first area A1 and a second area A2, respectively. The first area A1 is an area surrounding the second area A2 and is adjacent to the edges of the first through third lenses 313a, 313b, and 313c. The light sequentially passes through the first area A1 of the first through third lenses 313a, 313b, and 313c, and is condensed.

The mirror 312 is disposed to overlap at least one area of the first area A1 of the first through third lenses 313a, 313b, and 313c. That is, the reflective surface of the mirror 312 does not overlap with the second area A2 of the first through third lenses 313a, 313b, and 313c. The path of the light passing through the second area A2 of the first through third lenses 313a, 313b, and 313c is not changed.

On the other hand, when each of the third lens 313c, the second lens 313b, and the second lens A2 of the first lens 313a constituting the collimator 313 is sequentially passed through, It becomes a light beam.

The blue light that has sequentially passed through the first area A1 of the first through third lenses 313a 313b, and 313c enters the fluorescent wheel 315. The fluorescent wheel 315 changes the wavelength of the blue light and reflects it again.

For example, the fluorescent wheel 315 includes a wavelength converting material for converting the wavelength of the blue light into wavelengths of red (R), green (G), and yellow (Y). In general, the fluorescent wheel 315 has a plate shape formed of a material reflecting the light, and includes an axis perpendicular to the plate shape and passing through the center of the plate shape. The fluorescent wheel 315 rotates about the axis and the blue light output from the light source 311 by the fluorescent wheel 315 passes through the blue light B, the red light R, the green light G, And yellow light (Y).

The light of various wavelengths reflected by the fluorescent wheel 315 passes through the second area A2 of the first to third lenses 313a, 313b and 313c of the collimator 313, do. The collimated light beam is incident on the condenser lens unit 316.

The condensing lens unit 316 may be a fly-eye lens (FEL).

According to this embodiment, since blue light is moved through the peripheral portion of the collimator through the arrangement of the mirrors, it is not necessary to form a complicated optical path for forming light of various colors using blue light. Accordingly, the optical loss can be reduced, and the optical structures for the optical path can be minimized, so that the configuration of the light source unit can be minimized.

Therefore, it is possible to downsize the optical output device including the light source unit.

The components constituting the light source unit 320 according to FIG. 4B are substantially the same as the components of the light source unit 320 shown in FIG. 4A except for the components of the phosphor plate 321. Therefore, the same components are denoted by the same reference numerals and duplicate descriptions are omitted.

The condenser lens unit 316, the collimator 313, and the phosphor plate 321 are sequentially arranged along the z-axis (optical axis). The first to third lenses 313a, 313b and 313c of the collimator 313 are divided into the first and second regions A1 and A2.

The reflective surface of the mirror 312 is arranged to overlap with the first area A1 so that light is moved to the first area A1 of the first through third lenses 313a 313b 313c , And the reflective surface is disposed at 45 degrees with respect to the optical axis (z-axis).

Blue light passing through the first area A1 of the first to third lenses 313a, 313b, and 313c is incident on the RGB plate 321. For example, the RGB plate 321 may be formed by forming a phosphor pattern on a base substrate (for example, a glass substrate), and the phosphor pattern may include phosphors and phosphor elements having various wavelengths. The RGB plate 321 is composed of a fixed plate whose rotation and movement are limited. The RGB plate 321 is divided into a plurality of regions, and the wavelength of the light is changed so as to have the color of the phosphor corresponding to the region where the blue light reaches.

The light having the wavelength converted by the RGB plate 321 passes through the collimator 313 and reaches the condenser lens 314.

Since the RGB plate 321 is not configured to rotate, the generation of noise and vibration is blocked, and the area applied by the phosphor is relatively narrower than that of the fluorescent wheel, so that it can be realized at a low cost. In addition, since the color boundary can be formed, the loss of light can be reduced.

The light source unit 330 according to FIG. 4C includes the light source 311, the mirror 312, the collimator 313, the condenser lens 314, the color wheel 332, and the phosphor plate 331 . The components of the light source unit 330 of FIG. 4C are the same as those of the light source unit 310 of FIG. 4A except for the color wheel 315 and the phosphor plate 331, The same reference numerals are given, and redundant description is omitted.

The collimator 313, the condenser lens 314 and the phosphor plate 331 are arranged along the optical axis (z-axis). The color wheel 332 is disposed between the condenser lens 314 and the mirror 312.

The light output in the vertical direction of the optical axis (z axis) is transmitted through the mirror 312 to the first area A1 (313a, 313b, 313c) of the collimator 313 ). Light passing through the collimator 313 enters the phosphor plate 331. The phosphor plate 331 includes a phosphor element. The light reflected by the phosphor plate 331 is changed into light of various wavelengths, and white light is formed by mixing light of various wavelengths. That is, the blue light output from the light source is reflected by the phosphor plate 331 as white light.

The white light passes through the second area A2 of the collimator 313 and is formed into a horizontal light beam and reaches the color wheel 315. [ The color wheel 332 is divided into a plurality of regions, each of which is formed to pass the color of one wavelength. The color wheel 332 rotates while passing only the light of the wavelength of the specific region of the white light. Accordingly, the color wheel 332 rotates and light of various colors reaches the condenser lens 314.

According to the present embodiment, white light is formed using blue light, and light of various colors can be output through the color wheel.

According to the embodiments, since the light source and the mirror are disposed so as to penetrate the edge area of the collimator composed of the plurality of lenses, a separate component for changing the light path is unnecessary, and the light path of the incident light and the light The volume of the light source unit can be minimized.

5A to 5C are conceptual diagrams illustrating a light source unit including a light source and a relay lens according to another embodiment of the present invention.

5A, the light source unit 340 according to the present embodiment includes a light source 341, a mirror 342, a relay lens 343, a light funnel 344, and a fluorescent wheel 345, .

The relay lens 343, the optical funnel 344 and the fluorescent wheel 345 are arranged along the optical axis (z-axis), and the light source 341 and the mirror 342 are arranged on the x- Direction. The relay lens 343 includes first to third lenses 343a, 343b, and 343c. The first through third lenses 343a, 343b, and 343c may have different sizes. The first to third lenses 343a, 343b, and 343c) are preferably made of aspheric lenses.

The light source 341 outputs blue light along the x-axis. The light source 341 and the mirror 342 are spaced apart with the optical axis interposed therebetween. The mirror 342 is disposed adjacent to the second region A2 of the second lens 343b among the first to third lenses 343a, 343b and 343c and has an optical axis (z-axis) Are also inclined.

Accordingly, the blue light output from the light source 341 is reflected by the mirror 342, and is transmitted in the direction of the optical axis (z axis). The light reflected by the mirror 342 is sequentially incident on the second lens 343b and the first lens 342a. The light passing through the second and first lenses 343a and 343b is incident on the inner surface through the first region of the optical funnel 344. At least a part of the inner surface of the optical funnel 344 is formed of a reflective surface and is transmitted to a second area opposite to the first area by the reflective surface.

The optical funnel 344 may be divided into a first region B1 for reflecting the blue light and a second region B2 for outputting the blue light. The first and second regions B1 and B2 are divided based on the refraction angle of the relay lens 342 and the position of the relay lens 342 and the optical funnel 344. [ The light reflected by the second region B2 may be output from the optical funnel 344 to be incident on the fluorescent wheel 345.

The light reflected from the fluorescent wheel 345 is outputted to a wide area by the inner reflection surface of the optical funnel 344.

The fluorescent wheel 345 is disposed adjacent to the second region of the optical funnel 344 and the light emitted from the optical funnel 344 is changed in wavelength through the fluorescent wheel 345, And reflected toward the funnel 344. Light incident on the optical funnel 344 passes through the first through third lenses 343a, 343b, and 343c sequentially.

According to this embodiment, since the light incident on one region of the optical funnel is reflected toward the fluorescent wheel by the arrangement structure of the optical funnel and the relay lens, a separate optical structure for reaching the blue light to the fluorescent wheel is unnecessary .

The components of the light source unit 350 according to FIG. 5B are substantially the same as those of the light source unit 340 shown in FIG. 5A except for the RGB plate 351, so that the same components are given the same reference numerals, The description is omitted.

The light source unit 350 according to the present embodiment includes the first to third lenses 343a, 343b and 343 and the optical funnel 344 of the relay lens 343 arranged along the optical axis (z axis) And a mirror 342 and a light source 341 disposed along a vertical x-axis. The light source unit 350 includes an RGB plate 351 through which light emitted from the optical funnel 344 enters. For example, the RGB plate 351 may have a phosphor pattern formed on a base substrate (for example, a glass substrate), and the phosphor pattern may include phosphors and phosphor elements having various wavelengths. The RGB plate 351 is composed of a fixed plate whose rotation and movement are restricted. The RGB plate 351 is divided into a plurality of regions, and the wavelength of the light is changed so as to have the color of the phosphor corresponding to the region where the blue light reaches.

The optical funnel 344 according to the present embodiment is also divided into the first and second regions B1 and B2. The blue light output from the light source 341 enters the first area A1 of the second lens 343b and reaches the first area B1 of the optical funnel 344. [ The blue light reflected by the first region B1 of the optical funnel 344 is reflected by the RGB plate 351 in a state where the wavelength is changed.

The light having the changed wavelength is again reflected and emitted by the optical funnel 344 and passes through the relay lens 343. According to the light source unit according to the present embodiment, an additional component for moving light toward the RGB plate is unnecessary.

The light source unit 360 according to FIG. 5C includes the light source 311, the mirror 312, the optical funnel 344, the relay lens 343, the color wheel 362, and the phosphor plate 361 . The components of the light source unit 360 of FIG. 5C, except for the color wheel 362 and the phosphor plate 361, are substantially the same as the components of the light source unit 340 of FIG. 5A, Duplicate description is omitted.

The color wheel 362 is disposed between the second and third lenses 343b and 343c and the phosphor plate 361 is disposed adjacent to one end of the optical funnel 344. [

The blue light output from the light source 341 is reflected by the mirror 342 and passes through the second and first lenses 343b and 343a and enters the optical funnel 344. The blue light reflected by the inner reflecting surface of the optical funnel 344 is reflected by the phosphor plate 361 again.

The phosphor plate 361 includes a phosphor element. The light reflected by the phosphor plate 361 is changed into light of various wavelengths, and white light is formed by mixing light of various wavelengths. That is, the blue light output from the light source is reflected by the phosphor plate 361 as white light.

The reflected white light is again incident on the color wheel 362 through the optical funnel 344 and the first and second lenses 343a and 343b. The color wheel 362 is divided into a plurality of regions, each of which is formed to pass the color of one wavelength. The color wheel 362 rotates while passing only the light of the specific region of the white light. As a result, the color wheel 362 rotates and light of various colors reaches the third lens 343c.

According to the present embodiment, white light is formed using blue light, and light of various colors can be output through the color wheel.

According to the embodiments, the mirror can be arranged so that blue light is incident on a specific region of the optical funnel at a specific angle, and the wavelength of the blue light can be changed without a separate component.

6A and 6B are conceptual diagrams illustrating a light source unit for changing an optical path through a condenser lens according to another embodiment of the present invention.

The light source unit 410 according to FIG. 6A includes a light source 411, a first light collecting unit 412, a fluorescent wheel 413, and a second light collecting unit 414. The first and second light collecting parts 412 and 414 are formed of lenses formed to have at least one predetermined curvature.

The light source 411 may be a laser array including a plurality of laser diodes. The second light condensing unit 414 condenses the light output from the laser array. The light passing through the second light collecting part 414 is incident on the first area c1 of the first light collecting part 412.

The first surface (c1) on which the light output from the light source 411 is incident and the first surface (c1) on which the fluorescent wheel 413 And a second region c1 through which light reflected from the second region c1 is emitted. And the fluorescent wheel 413 is disposed adjacent to the second surface.

The first region c1 of the first surface has a predetermined curvature such that light incident on the first region c1 is refracted into a region of the second surface on which the fluorescent wheel 413 is disposed. The curvatures of the first and second regions c1 and c2 may be different from each other. For example, the first surface may have a convex curved surface, and the first region c1 may be a flat surface.

For example, the fluorescent wheel 413 is disposed adjacent to the center of the second surface, and the first region c1 is located at a center of the fluorescent wheel 413, And an edge region adjacent to the end region of the face. The light reflected from the fluorescent wheel 413 is refracted into one area of the first surface and is emitted. The light emitted to one region of the first surface is formed to have substantially the same moving direction.

The light source unit 420 according to FIG. 6B includes the light source 411, the first condensing device 412, and the fluorescent wheel 413. The first condensing device 412 includes first and second surfaces having different curvatures. And the fluorescent wheel 413 is disposed adjacent to the center area of the second surface.

The light source 411 includes a laser array including a plurality of laser diodes. The light output from the laser array enters the specific region c3 of the first surface and is refracted. The light incident on the first surface reaches one region of the second surface on which the fluorescent wheel 413 is disposed.

The laser array is arranged to be incident on one area of the first surface so that the light can reach one area of the second surface.

On the other hand, the light reflected from the fluorescent wheel 413 is refracted through the first surface and is output in one direction. The first surface of the first light collecting part 412 according to the present embodiment may be made aspherical so that the light reflected by the fluorescent wheel 413 is transmitted in the same direction.

According to this embodiment, the incident path of the fluorescent wheel 413 and the reflecting path from the fluorescent wheel 413 can be formed in the first light collecting part by dividing the area of the first light collecting part. Accordingly, a separate component for forming an optical path is not required, and the fluorescent wheel 413 can be disposed adjacent to the first condensing unit, thereby preventing leakage of light and maximizing space efficiency.

7 is a conceptual diagram for explaining a light source unit including a total reflection part according to another embodiment.

7 includes a light source 511, a total reflection part 512, a fluorescent part 513, a first light collecting part 514 and a second light collecting part 515.

The total reflection part 512, the fluorescent part 513, and the first and second light collecting parts 514 and 515 are arranged along the optical axis (z axis) direction. The light source 511 is disposed adjacent to the total reflection part 512 to output light toward the total reflection part 512 in the z-axis direction perpendicular to the optical axis.

The total reflection part 512 may include first and second prisms disposed adjacent to each other, and the first and second prisms may be spaced apart from each other to form a total reflection surface 512a. Due to the refractive index difference of the total reflection surface 512a, the light incident on the total reflection surface 512a is reflected toward the first surface 512b. The first surface 512b is adjacent to the fluorescent portion 513 and the second surface 512c is opposite to the first surface 512b and is adjacent to the first light collecting portion 514 .

The light reflected by the first surface 512b is reflected again by the fluorescent portion 513 and output to the first condensing portion 514 through the first and second surfaces 512b and 512c. The fluorescent portion 513 may be an RGB plate or a fluorescent wheel that changes the wavelength of the incident light.

The first and second light collecting units 514 and 515 may include at least one lens and form an optical path such that the light reflected by the fluorescent unit 513 moves in one direction.

According to the present embodiment, there is no need for a separate component for changing the optical path through the total reflecting portion which is made of a prism and changes the optical path.

The light source unit of the present invention can be mounted in an illumination device as well as an image projection device.

The above-described light source unit and an image projection apparatus and an illumination apparatus including the same The configuration and method of the above-described embodiments are not limitedly applied, but the embodiments may be modified so that various modifications may be made. Or some of them may be selectively combined.

Claims (10)

A light source for outputting blue light in a first direction;
A mirror disposed obliquely to the first direction so that the blue light moves in a second direction intersecting with the first direction;
A plurality of lenses;
And a fluorescent portion that changes the wavelength of the blue light having passed through at least one of the plurality of lenses and reflects the changed wavelength of the light so as to pass through the plurality of lenses along a direction opposite to the second direction, . The method according to claim 1,
Wherein each of the plurality of lenses is divided into a first region through which the blue light passes and which is adjacent to an edge region, and a second region through which the first region surrounds and through which light having the changed wavelength passes. 3. The method of claim 2,
Wherein the mirror is disposed so as to overlap with a first region of at least one of the lenses. The method according to claim 1,
Wherein the fluorescent unit comprises a fluorescent wheel or fluorescent elements for rotating the one axis and changing the wavelength of the blue light, and an RGB plate for changing the wavelength of the blue light. The method according to claim 1,
Wherein the fluorescent portion comprises a fluorescent plate that changes the wavelength of the blue light to reflect white light,
Wherein the fluorescent portion further comprises a color wheel disposed between the plurality of lenses and passing light of a specific wavelength from the white light. The method according to claim 1,
Further comprising a light funnel disposed between the plurality of lenses and the fluorescent portion,
And the inner surface of the optical funnel is formed as a reflecting surface so as to reflect the blue light reaching the inner surface to the fluorescent portion. The method according to claim 1,
Wherein the blue light and the first lens through which the wavelength changed light include a first surface on which the blue light and the changed wavelength light are incident or output and a second surface adjacent to the fluorescent portion, and,
Wherein a refractive index of one region of the first surface on which the blue light is incident is different from a curvature of the remaining region. 8. The method of claim 7,
Wherein the light source comprises a plurality of laser arrays,
And a second lens adjacent to the light source among the plurality of lenses is formed to change the moving direction of the light source so that the blue light passes through the first lens and reaches the fluorescent portion. 8. The method of claim 7,
Wherein the light source comprises a plurality of laser arrays,
Wherein the first lens is configured so that the parallel light output from the plurality of laser arrays is refracted to reach the fluorescent portion. The method according to claim 1,
Wherein the first lens of the plurality of lenses includes first and second prisms arranged to form a clearance for total reflection of the blue light.

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