KR102531419B1 - Light source unit - Google Patents

Abstract

The present invention is 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 crossing the first direction, a plurality of lenses, the plurality of A light source device having a fluorescent unit for changing the wavelength of blue light passing through at least one area of the lens and reflecting the light having the changed wavelength to pass through the plurality of lenses along a direction opposite to the second direction.

Description

Light source unit {LIGHT SOURCE UNIT}

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

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

Recently, as the performance of a projector is considered important, various new attempts are being applied 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 a light source.

In general, a light source unit uses blue light to form light including various colors. However, since a separate blue light path is required to obtain the blue light, a space inside the light source unit for forming the blue light path is required.

Accordingly, a technical problem of the present invention is 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 is a light source that outputs blue light in a first direction, and the blue light moves in a second direction crossing the first direction. , A mirror disposed obliquely to the first direction, a plurality of lenses, and changing the wavelength of blue light passing through at least one area of the plurality of lenses, and passing the light having the changed wavelength along a direction opposite to the second direction It includes a fluorescent part that reflects so as to pass through the plurality of lenses.

As an example related to the present invention, each of the plurality of lenses is divided into a first area through which the blue light passes and adjacent to an edge area, and a second area surrounded by the first area and through which the light having the changed wavelength passes, wherein the Since the mirror is disposed to overlap the first region of at least one of the lenses, the blue light may be transmitted to the fluorescent unit using the refractive index of the lens for outputting light.

As an example related to the present invention, a first lens through which the blue light and the light of which the wavelength is changed passes among the plurality of lenses has a first surface through which the blue light and the light of which the wavelength is changed are incident or output, and the fluorescence It may include a second surface adjacent to the portion, and the refractive index of one area of the first surface into which the blue light is incident may be different from the curvature of the other areas. Accordingly, a light path may be formed without an additional optical configuration by forming the refractive index of one lens to be different from each other.

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

In addition, when the blue light is output as a laser array, the refractive index of a specific area of the lens is formed differently from other areas, so that the blue light can be more accurately transferred to the fluorescent unit without an additional optical configuration.

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

1 is a conceptual diagram illustrating the operation of an image projection device having an optical device according to an embodiment of the present invention.
2A and 2B are perspective views of the image projection device of FIG. 1 viewed from the front and rear, respectively.
3 is an exploded view of the image projection device of FIG. 1;
4A to 4C are conceptual diagrams for explaining components of a light source unit according to an embodiment of the present invention.
5A to 5C are conceptual views illustrating a light source unit including an optical funnel and a relay lens according to another embodiment of the present invention.
6A and 6B are conceptual diagrams for explaining a light source unit that changes an optical path through a condensing lens according to another embodiment of the present invention.
7 is a conceptual diagram for explaining a light source unit including a total reflector according to another embodiment.

It should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in this specification should be interpreted in terms commonly understood by those of ordinary skill in the art to which the present invention belongs, unless specifically defined otherwise in this specification, and are overly inclusive. It should not be interpreted in a positive sense or in an excessively reduced sense. In addition, when the technical terms used in this specification are incorrect technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that those skilled in the art can correctly understand. In addition, general terms used in the present invention should be interpreted as defined in advance or according to context, and should not be interpreted in an excessively reduced sense.

Also, singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or some of the steps It should be construed that it may not be included, or may further include additional components or steps.

Also, terms including ordinal numbers such as first and second used in this specification may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

1 is a conceptual diagram illustrating the operation of an image projection device having an optical device according to an embodiment of the present invention.

The image projection device 100 of the present invention projects a large-screen image onto the screen S while being disposed at a very short distance from the screen S.

The image projection device 100 is a device that implements an image using light generated from a light source and projects the implemented image, and may be a projector or the like that enlarges and projects the image as shown. Hereinafter, the image projection device 100 related to the present invention will be described based on a projector. However, the image projection device 100 is not limited thereto, and may be applied to a projection device built into a projection television, for example. Hereinafter, in this specification, it will be described based on the projector.

According to the illustration, the image projection device 100 is disposed adjacent to the lower side (or upper side) of the screen S, and is formed to form a large screen image on the screen S in this state.

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

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

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

Referring to these drawings, the appearance of the image projector 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 and 112 .

A control unit 113 may be disposed on the upper case 111 . The manipulation unit 113 may be employed in any manner as long as the user manipulates it while having a tactile feeling.

The control unit 113 receives commands for controlling the operation of the image projection device 100 . In terms of functionality, the control unit 113 can be used to input menus such as start and end.

In addition, the control unit 113 can be manipulated to zoom-in or zoom-out the image projected by the image projection device 100 . The control unit 113 can be operated to focus the image projected from the image projection device 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 is made up of a plurality of through-holes and allows air to flow into the image projector 100 . Through this, it is possible to cool the image projector 100 using forced convection.

The interface 115 becomes a passage through which the image projector 100 can exchange data with an external device. Through the interface 115 , image data corresponding to an image to be projected by the image projection device 100 may be input from the outside. Referring to this figure, the interface 115 includes a connection terminal that can be electrically connected to an electronic device capable of supplying video or audio data, for example, a computer, a DVD player, or the like.

The power supply unit 116 is mounted on the lower case 112 for supplying power to the image projector 100 . The power supply unit 116 may be configured to receive, for example, AC household power and convert it into DC power. However, the configuration of the power supply unit 116 is not limited thereto, and may be detachably coupled for charging as a rechargeable battery.

In either of the upper and lower cases 111 and 112, a sound output unit may be implemented in the form of a speaker, and an antenna for receiving a broadcast signal 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 disposed at predetermined intervals. The projection unit 117 may be formed such that intervals between a plurality of lenses and mirrors are adjusted by manipulation of the control unit 113 . Through this, the zoom or focusing function of the image projection device 100 can be implemented.

The image projection device 100 includes a light source unit emitting light. The light source unit of the present invention includes a light source emitting blue light, and a transmission path of the blue light and a moving path of a plurality of lights having different wavelengths from the blue light are formed identically. Hereinafter, a detailed structure of the light source unit will be described.

Referring to FIG. 3 , the image projector 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. there is.

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 device 100 .

The light source unit 300 may be mounted on the lower case 112 . The light source unit 300 means a system of optical components for realizing an image of an object by using reflection or refraction of light in the image projector 100 . A structure (not shown) into 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 conversion device 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 color-converts or color-separates the generated light and converts it into an image using a display device. It is enlarged and projected on the screen output from the image converter 140.

The light source unit 300 has a compact structure in which blue light and light having a changed wavelength are output again 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 for explaining 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 condensing 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 a central axis (z-axis). A light source 311 outputting light in an x-axis direction perpendicular to the central axis (z-axis) is disposed. The light source 311 is formed in an area deviated from the z-axis. The light source 311 may be formed of 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 to the x-axis, and changes the movement path of the light output in the x-axis direction. That is, the movement path of the light output in the x-axis direction by the mirror 312 may 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 . Light reflected by the mirror 312 to move in the z-axis direction passes through the first to third lenses 313a, 313b, and 313c constituting the collimator 313. Preferably, the first to third lenses 313a, 313b, and 313c are made of aspherical lenses.

The first to third lenses 313a, 313b, and 313c may be divided 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 an area adjacent to edges of the first to third lenses 313a, 313b, and 313c. The light sequentially passes through the first area A1 of the first to 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 to third lenses 313a, 313b, and 313c. That is, the reflecting surface of the mirror 312 does not overlap the second area A2 of the first to third lenses 313a, 313b, and 313c. Accordingly, the path of the light passing through the second area A2 of the first to third lenses 313a, 313b, and 313c is not changed.

Meanwhile, when sequentially passing through the third lens 313c, the second lens 313b, and the second area A2 of the first lens 313a constituting the collimator 313, one ray is parallel. becomes a beam of light

The blue light sequentially passing through the first area A1 of the first to third lenses 313a, 313b, and 313c is incident on 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 conversion material for converting the wavelength of the blue light into red (R), green (G), and yellow (Y) wavelengths. In general, the fluorescent wheel 315 is made of a plate shape made of a material that reflects the light, and includes an axis perpendicular to the plate shape and penetrating 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 is blue light (B), red light (R), and green light (G). and yellow light (Y) and is reflected.

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 constituting the collimator 313, forming parallel rays. do. The parallel rays are incident on the condensing lens unit 316 .

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

According to this embodiment, since the blue light is moved through the periphery of the collimator through the arrangement of the mirrors, there is no need to form a complicated optical path for forming light of various colors using the blue light. Accordingly, light loss can be reduced, and since optical structures for light paths can be minimized, the configuration of the light source unit can be minimized.

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

Components constituting the light source unit 320 according to FIG. 4B are substantially the same as those of the light source unit 320 of FIG. 4A except for components of the phosphor plate 321 . Therefore, the same reference numerals are given to the same components and overlapping descriptions are omitted.

The condensing 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 areas A1 and A2.

The reflecting surface of the mirror 312 is disposed to overlap the first area A1 so that light moves to the first area A1 of the first to third lenses 313a, 313b, and 313c. , The reflecting surface is arranged to form 45 degrees with the optical axis (z-axis).

The 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 has a phosphor pattern formed on a base substrate (eg, a glass substrate), and the phosphor pattern may include phosphors and phosphor elements of various wavelengths. The RGB plate 321 is formed of a fixed plate with limited rotation and movement. The RGB plate 321 is divided into a plurality of areas, and the wavelength of light is changed to have a color of a phosphor corresponding to the area to which the blue light has reached.

Light reflected by the RGB plate 321 and converted in wavelength passes through the collimator 313 and reaches the condensing lens 314 .

Since the RGB plate 321 does not rotate, generation of noise and vibration is blocked, and since the area covered by the phosphor is relatively narrow compared to the phosphor wheel, it can be implemented at low cost. In addition, since it can be formed without color boundaries, 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 condensing lens 314, the color wheel 332, and the phosphor plate 331. . Except for the color wheel 315 and the phosphor plate 331, components of the light source unit 330 of FIG. 4C are the same as those of the light source unit 310 of FIG. Reference numerals are given, and overlapping descriptions are omitted.

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

The light output in the direction perpendicular to the optical axis (z-axis) passes through the mirror 312 and is applied to the first area A1 of the first to third lenses 313a, 313b, and 313c of the collimator 313. ) penetrates Light passing through the collimator 313 is incident on 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 the light of various wavelengths. That is, blue light output from the light source is reflected as white light by the phosphor plate 331 .

The white light is formed as a horizontal ray passing through the second area A2 of the collimator 313 and reaches the color wheel 315 . The color wheel 332 is divided into a plurality of areas, each of which transmits a color of one wavelength. While rotating, the color wheel 332 transmits only light of a wavelength in a specific region among the white light. Accordingly, while the color wheel 332 rotates, light of various colors reaches the condensing lens 314 .

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

According to the present embodiments, since the light source and the mirror are disposed to pass through the edge region of the collimator composed of a plurality of lenses, a separate component for changing the path of light is not required, and the light path of the incident light and the output light is Since they are formed adjacently, the volume of the light source unit can be minimized.

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

Referring to FIG. 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. includes

The relay lens 343, the optical funnel 344, and the fluorescent wheel 345 are arranged along an optical axis (z-axis), and the light source 341 and the mirror 342 are arranged along an x-axis perpendicular to the optical axis. arranged in the direction The relay lens 343 includes first to third lenses 343a, 343b, and 343c. The first to third lenses 343a, 343b, and 343c may have different sizes. Preferably, the first to third lenses 343a, 343b, and 343c are made of aspherical lenses.

The light source 341 outputs blue light along the x-axis. The light source 341 and the mirror 342 are spaced apart from each other with the optical axis interposed therebetween. The mirror 342 is disposed adjacent to the second area A2 of the second lens 343b among the first to third lenses 343a, 343b, and 343c, and is disposed at a distance of about 45° from the optical axis (z-axis). It is also arranged to be inclined.

Accordingly, the blue light output from the light source 341 is reflected by the mirror 342 and transmitted in the direction of the optical axis (z-axis). The light reflected by the mirror 342 sequentially enters the second lens 343b and the first lens 342a. The light passing through the second and first lenses 343a and 343b is incident to the inner surface through the first region of the optical funnel 344 . At least a part of the inner surface of the light funnel 344 is made of a reflective surface, and the light 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 area B1 for reflecting and outputting the blue light and a remaining second area B2. The first and second regions B1 and B2 are partitioned based on the refraction angle of the relay lens 342 and the positions 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 output over a wide area by the internal reflection surface of the optical funnel 344 .

The fluorescence wheel 345 is disposed adjacent to the second area of the light funnel 344, and the wavelength of light emitted from the light funnel 344 is changed through the light funnel 345, and the light emitted from the light funnel 344 is changed again. It is reflected towards the funnel 344. The light incident on the optical funnel 344 passes through the first to third lenses 343a, 343b, and 343c sequentially.

According to the present embodiment, the light incident on one area of the optical funnel is reflected toward the fluorescent wheel by the arrangement structure of the optical funnel and the relay lens, so that a separate optical structure for reaching the fluorescent wheel is not required. .

Since the components of the light source unit 350 according to FIG. 5B are substantially the same as those of the light source unit 340 of FIG. 5A except for the RGB plate 351, the same reference numerals are given to the same components and overlapping omit explanation.

The light source unit 350 according to the present embodiment includes the first to third lenses 343a, 343b, and 343 of the relay lens 343 arranged along the optical axis (z-axis) and the optical funnel 344 and the optical axis A light source 341 and a mirror 342 are disposed along the vertical x-axis. In addition, the light source unit 350 includes an RGB plate 351 into which the light emitted from the light funnel 344 is incident. For example, the RGB plate 351 has a phosphor pattern formed on a base substrate (eg, a glass substrate), and the phosphor pattern may include phosphors and phosphor elements of various wavelengths. The RGB plate 351 is formed of a fixed plate with limited rotation and movement. The RGB plate 351 is divided into a plurality of areas, and the wavelength of light is changed to have a color of a phosphor corresponding to the area to which the blue light has reached.

The optical funnel 344 according to this 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 in which the wavelength is changed.

The light whose wavelength is changed is reflected and emitted again by the optical funnel 344 and passes through the relay lens 343 . According to the light source unit according to this 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 light funnel 344, the relay lens 343, the color wheel 362, and the phosphor plate 361. . Except for the color wheel 362 and the phosphor plate 361, components of the light source unit 360 of FIG. 5C are substantially the same as those of the light source unit 340 of FIG. 5A, so they are given the same reference numerals. Redundant descriptions are 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 light funnel 344 .

The blue light output from the light source 341 is reflected by the mirror 342, passes through the second and first lenses 343b and 343a, and is incident into the optical funnel 344. The blue light reflected by the internal reflection surface of the optical funnel 344 is reflected back by the phosphor plate 361 .

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

The reflected white light passes through the light funnel 344 and the first and second lenses 343a and 343b and is incident on the color wheel 362 . The color wheel 362 is divided into a plurality of regions, each of which transmits a color of one wavelength. While rotating, the color wheel 362 transmits only light of a wavelength of a specific region among the white light. Accordingly, while the color wheel 362 rotates, light of various colors reaches the third lens 343c.

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

According to the present embodiments, the wavelength of blue light can be changed without a separate component by arranging a mirror to inject blue light into a specific area of an optical funnel at a specific angle.

6A and 6B are conceptual diagrams for explaining a light source unit that changes an optical path through a condensing 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 part 412, a fluorescent wheel 413, and a second light collecting part 414. The first and second concentrating parts 412 and 414 are formed of lenses formed to have at least one predetermined curvature.

The light source 411 may include a laser array composed of a plurality of laser diodes. The second concentrating part 414 condenses the light output from the laser array. The light passing through the second concentrating part 414 is incident to the first area c1 of the first concentrating part 412 .

The first light collecting part 412 is composed of a first surface and a second surface, and the first surface includes the first area c1 into which the light output from the light source 411 is incident and the fluorescent wheel 413. ), and a second region c1 from which light reflected from ) is emitted. The fluorescent wheel 413 is disposed adjacent to the second surface.

The first area c1 of the first surface has a predetermined curvature such that light incident to the first area c1 is refracted to one area of the second surface where the fluorescent wheel 413 is disposed. The first and second regions c1 and c2 may have different curvatures. For example, the first surface may be formed of a convex curved surface, and the first region c1 may be formed of a flat surface.

For example, the fluorescent wheel 413 is disposed adjacent to the center of the second surface, and the first area c1 is the center of the fluorescent wheel 413 and is adjacent to the light source 411. It is formed by the edge area adjacent to the edge area of the face. The light reflected from the fluorescent wheel 413 is refracted and emitted to one area of the first surface. The light emitted to one area 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 concentrator 412 and the fluorescent wheel 413 . The first concentrator 412 includes first and second surfaces having different curvatures. The fluorescent wheel 413 is disposed adjacent to the central region of the second surface.

The light source 411 is composed of a laser array composed of a plurality of laser diodes. The light output from the laser array is incident on the specific area c3 of the first surface and is refracted. The light incident on the first surface reaches one area of the second surface where 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.

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

According to this embodiment, an incident path of the fluorescent wheel 413 and a reflection path from the fluorescent wheel 413 may be both formed in the first light collecting part by dividing the area of the first light collecting part. Accordingly, since a separate component forming an optical path is unnecessary and the fluorescent wheel 413 can be disposed adjacent to the first concentrating part, light leakage can be prevented and space efficiency can be maximized.

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

The light source unit 510 according to FIG. 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 unit 512 to output light toward the total reflection unit 512 in a z-axis direction perpendicular to the optical axis.

The total reflection part 512 includes first and second prisms disposed adjacent to each other, and the first and second prisms may be disposed while forming a spaced gap from each other to form a total reflection surface 512a. The total reflection surface 512a reflects the light incident on the total reflection surface 512a toward the first surface 512b due to a difference in refractive index. The first surface 512b is a surface adjacent to the fluorescent part 513, and the second surface 512c faces the first surface 512b and corresponds to a surface adjacent to the first light collecting part 514. .

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

The first and second concentrating parts 514 and 515 may include at least one lens, and form an optical path so that the light reflected by the fluorescent part 513 moves in one direction.

According to this embodiment, there is no need for a separate component that changes the optical path through the total reflection part that is made of a prism and changes the optical path.

The light source unit of the present invention may be mounted in a lighting device as well as an image projector.

The light source unit described above and the image projection device and lighting device including the same The configuration and method of the above-described embodiments are not limitedly applicable, but the above embodiments are all of the embodiments so that various modifications can be made. Alternatively, some of them may be selectively combined.

Claims (10)

a light source 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 crossing the first direction;
multiple lenses;
A fluorescent unit for changing a wavelength of blue light passing through at least one area of the plurality of lenses and reflecting the light having the changed wavelength to pass through the plurality of lenses along a direction opposite to the second direction;
Each of the plurality of lenses is partitioned into a first area and a second area,
The first area is an area through which the blue light passes, surrounds the second area, and is adjacent to an edge area;
The second area is located inside the first area and is an area through which the light having the changed wavelength passes. delete According to claim 1,
The light source unit of claim 1 , wherein the mirror is disposed to overlap a first area of at least one of the lenses. According to claim 1,
The light source unit, characterized in that the fluorescent part is composed of a RGB plate that rotates on one axis and includes a fluorescent wheel or fluorescent elements that change the wavelength of the blue light and change the wavelength of the blue light. a light source 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 crossing the first direction;
multiple lenses;
A fluorescent unit for changing a wavelength of blue light passing through at least one area of the plurality of lenses and reflecting the light having the changed wavelength to pass through the plurality of lenses along a direction opposite to the second direction;
The fluorescent part is made of a fluorescent plate that changes the wavelength of the blue light and reflects white light,
The light source unit of claim 1 , further comprising a color wheel disposed between the plurality of lenses and passing light of a specific wavelength from the white light. According to claim 1,
Further comprising an optical funnel disposed between the plurality of lenses and the fluorescent part,
The light source unit of claim 1 , wherein the inner surface of the light funnel is formed as a reflective surface so as to reflect the blue light reaching the inner surface to the fluorescent part. a light source 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 crossing the first direction;
multiple lenses;
A fluorescent unit for changing a wavelength of blue light passing through at least one area of the plurality of lenses and reflecting the light having the changed wavelength to pass through the plurality of lenses along a direction opposite to the second direction;
Among the plurality of lenses, a first lens through which the blue light and the light with the changed wavelength pass includes a first surface on which the blue light and the light with the changed wavelength are incident or output, and a second surface adjacent to the fluorescent part. do,
The refractive index of one region of the first surface into which the blue light is incident is different from the curvature of the other regions,
The first surface includes a first area into which the blue light is incident and a second area into which the light having the changed wavelength is emitted,
The light source unit, characterized in that the first surface is made of a convex curved surface, and the first area is made of a flat surface. According to claim 7,
The light source consists of a plurality of laser arrays,
A light source unit, wherein a second lens adjacent to the light source among the plurality of lenses is configured to change a moving direction of the light source so that the blue light passes through the first lens and reaches the fluorescent part. delete a light source 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 crossing the first direction;
multiple lenses;
A fluorescent unit for changing a wavelength of blue light passing through at least one area of the plurality of lenses and reflecting the light having the changed wavelength to pass through the plurality of lenses along a direction opposite to the second direction;
The light source unit of claim 1 , wherein a first lens among the plurality of lenses includes first and second prisms disposed to form a spaced gap so as to totally reflect the blue light.

Images