KR20140096492A - Vertical type projector - Google Patents

Abstract

A vertical projector includes a light source unit emitting light; a reflective mirror which reflects the light emitted from the light source unit to switch the direction of the light; a synthesis system which is used to form an image based on the light reflected by the reflective mirror and an image signal; a projection lens which projects the image formed by the synthesis system; and a housing accommodating the light source unit, the synthesis system, and the projection lens. The present invention can obtain a portable projector which is more compact and is easy to grip by changing the structure of a conventional projector, which is wide in the horizontal direction, through the combination of the vertical and horizontal directions.

Description

{Vertical Type Projector}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a vertical type projector which is easy to carry by reducing a horizontal length.

The projector converts an image signal supplied from the outside into projection light and enlarges the projection image on the screen. The projection light projected on the screen is projected together with the image provided by a light source such as a lamp provided inside the projector.

Such a projector may be mounted on a ceiling of a room equipped with a screen and used in a fixed manner, or may be used as a method of mounting on a table or the like.

A general projector may be provided in a form including a flat hexahedron housing, and a projection lens unit for projecting the projection light is generally provided in a front portion of the projector housing.

The size of the projector is becoming smaller, and the use of a portable device such as a notebook computer increases, so that the projector is often used to move the projector to use the projector regardless of the place.

In recent years, a portable projector has been introduced as a projector has been reduced in size and weight, and there is a demand for a projector that is more compact and easy to hold in order to improve portability.

SUMMARY OF THE INVENTION The present invention aims to solve the above problem by arranging a light source of a projector in a vertical direction to improve a conventional flat structure.

The present invention relates to a light source which emits light; A reflector for reflecting light emitted from the light source unit and converting the direction of light; A synthesizer for synthesizing an image based on the light reflected by the reflector and the image signal; A projection lens for projecting an image synthesized in the capturing system; And a housing in which the light source unit, the synthesizing system, and the projection lens are accommodated.

The light source unit supplies light in a vertical direction, and the reflector can convert the light in the vertical direction into a horizontal direction.

The composite system comprising: an image panel for combining light reflected from the reflector with an image signal; And a prism that reflects light emitted from the image panel and transmits light that is reflected by the reflector and enters the synthesis system.

Wherein the prism has a triangular prism shape having a triangular upper surface and a lower surface, the prism having a second side adjacent to an edge at one side of the first side and the prism having a second side on which the image panel is disposed, And a third side on which the lens is disposed, wherein the first side reflects light emitted from the image panel and can be emitted to the third side.

The composite system may further include a cylinder lens interposed between the reflector and the first side surface of the prism to guide light reflected by the reflector to the image panel.

Wherein the cylinder lens has a thick portion of the cylinder lens passing through a thin portion of the cylinder lens so that light incident on one side edge of the first side surface passes through a thick portion of the cylinder lens and light incident on the other corner side passes through a thin portion of the cylinder lens, As shown in FIG.

The cylinder lens may be an asymmetric lens having a thick one end and a thin one.

One side of the cylinder lens adjacent to one side edge of the prism may be tilted toward the prism and the other side may be tilted toward the reflecting mirror.

In the shape of the rectangle, the reflector may be cut in a shape corresponding to the inclination of the tilted cylinder lens.

The image panel may use a digital micromirror device (DMD) having a pixel mirror moving in units of pixels.

The housing may be longer in length than the front of the front.

The light source may include three light sources for emitting red, green, and blue light, and a color synthesizing unit for synthesizing light emitted from the light source into white light.

And a light uniforming unit for uniformly supplying light emitted from the color combining unit.

The light uniformizing unit may include a fly-eye lens and a relay lens.

The relay lens may have a curvature radius in the horizontal direction smaller than a curvature radius in the vertical direction.

The relay lens collects light in a horizontal direction and diffuses light in a vertical direction.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a perspective view of a projector according to an embodiment of the present invention.
2 is a partial perspective view showing the internal components of the projector according to one embodiment of the present invention.
Figure 3 is a side view of Figure 2;
Fig. 4 is a plan view of Fig. 2. Fig.
Fig. 5 is a rear view of Fig. 2; Fig.
FIGS. 6 and 7 are views showing paths of light that passes through the cylinder lens and the prism and is incident on the image panel.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It should be understood, however, that there is no intention to limit the scope of the present invention to the embodiment shown, and other embodiments which are degenerative by adding, changing or deleting other elements or other embodiments falling within the spirit of the present invention Can be proposed.

1 is a perspective view showing a projector 100 according to an embodiment of the present invention and shows a housing 50 of the projector 100 and a projection lens 40 exposed on the front surface of the housing 50. As shown in Fig. The projector 100 according to the present invention is characterized in that the front face where the projection lens 40 exposed to the outside is located differs from the conventional projector 100 in that the horizontal length is reduced and the vertical length is increased.

As shown in FIG. 2, the light source unit 10, which has been disposed in the horizontal direction in the related art, is arranged vertically in the z-axis direction so that the horizontal length is reduced and the vertical length is increased. The projector 100 having a shorter width than the projector 100 of a wide width type is easy to hold because it can be easily gripped.

FIG. 2 is a partial perspective view showing the internal components of the projector 100 according to one embodiment of the present invention, and FIGS. 3 to 5 are a side view, a plan view, and a rear view of FIG. 2 to 5 show a light source 10, a reflector 20, a composite system 30, and a projection lens 40. The light emitted from the light source unit 10 is reflected by the reflector 20 to change the direction of the light. The synthesizer 30 synthesizes the light and the image information and emits the combined light through the projection lens 40.

The light source unit 10 may include light sources 11, 12 and 13, a color synthesizing unit 14, and light uniformizing units 15 and 16.

The light source includes three lamps emitting light of red (11), green (12), and blue (13), and each lamp may be provided with a focusing lens for focusing light. The light emitted from the light sources 11, 12 and 13 is synthesized into white light by the color synthesizing unit 14 and the color synthesizing unit 14 synthesizes two intersecting dichroic mirrors Mirror) can be used.

The light synthesized by the white light is supplied to the light smoothing units 15 and 16. The light uniformizing portions 15 and 16 may include one or more fly eye lenses 15 and two fly eye lenses 15 may be arranged to face each other. The fly-eye lens 15 includes a plurality of fine lenses having a rectangular cross-sectional shape and is refracted when light passes through the fine lenses to intersect the light of the adjacent fine lenses.

The light uniformizing units 15 and 16 may further include a relay lens 16 for focusing the light that has passed through the fly-eye lens 15. Light having passed through the light uniformizing units 15 and 16 is supplied to the synthesis system 30 through uniform rectangular light.

The present invention is characterized in that the path of light from the light sources 11,12 and 13 to the color coding unit 14 and the light equalizing units 15 and 16 does not extend in a straight line with the synthetic system 30, Direction. Conventionally, the light uniformizing units 15 and 16, the color synthesizing unit 14, and the light sources 11, 12, and 13, which are arranged side by side in the lateral direction of the synthesis system 30, z-axis direction).

Therefore, in order to supply the light emitted from the light source unit 10 to the combining unit, it is necessary to change the direction of the light. In the present invention, the reflector 20 is used to convert the light path into the horizontal direction (x-axis direction).

The reflector 20 is disposed obliquely from the direction of light supplied from the light source unit 10 as shown in FIGS. 2 and 5 in order to transmit the light emitted from the light source unit 10 to the synthesizer 30.

Light that is reflected from the reflector 20 and is bent in the horizontal direction (x-axis direction) in the vertical direction (z-axis direction) of the light travels to the composite system 30. The composite system 30 includes an image panel 31 for synthesizing light and image information and emitting light in pixel units.

The image panel 31 composes a specific image by combining light and image information having information such as hue, saturation, brightness, etc. on a pixel-by-pixel basis. A digital micromirror device (DMD) can be used as the image panel 31.

The digital micromirror device 31 includes a pixel mirror moving in units of pixels. The pixel mirror switches light and image information by selectively or non-reflecting light by switching over several thousand times per second.

The digital micromirror device 31 may be formed of a micromirror in the form of a rhombus, and has a rhomboid shape, so that the F number is different from the horizontal direction and the vertical direction. In the present invention, it is possible to use the digital micromirror device 31 in which the F number in the horizontal direction (y axis direction) is smaller than the F number in the vertical direction (z axis direction).

The smaller the F number, the brighter the light is, because it is brighter. The larger the F number, the darker it is. Therefore, light is supplied to the digital micromirror device 31 in a large area in the horizontal direction and refracted in the horizontal direction and the vertical direction by a cylinder lens relay lens so that light is supplied in a narrow area in the vertical direction .

Since the digital micromirror device 31 synthesizes image information and light in the form of reflecting light, light is again emitted in the incident direction. The light reflected from the reflecting mirror 20 is incident on the prism 32 so that the light reflected from the reflecting mirror 20 can be incident on the digital micromirror device 31 while transmitting the synthesized light from the digital micromirror device 31 in the direction of the projection lens 40 32).

The prism 32 has a triangular prism shape having three sides as shown in Fig. The light reflected from the reflector 20 is incident on the first side surface 32a and the image panel 31 is positioned on the second side surface 32b adjacent to the first side surface 32a, A projection lens 40 is disposed on the side surface 32a and the third side surface 32c adjacent to the other side.

The first side surface 32a transmits the light reflected by the reflector 20 and supplies the light to the image panel 31 located on the second side surface 32b and the synthesized light emitted from the image panel 31 And changes the light path in the direction of the third side surface 32c.

The selective transmission is a phenomenon in which light is refracted and totally reflected, and when light is incident on a medium having a large refractive index within a predetermined angle range, the property that light is totally reflected is referred to as total reflection. That is, the first side surface 32a reflects the light incident on the second side surface 32b toward the third side surface 32c using the total reflection property.

At this time, the angle between the second side surface 32b and the third side surface 32c may be 90 degrees, that is, a prism 32 of a right triangular prism may be used.

However, since the prism 32 has a triangular prism shape, the time for passing the prism 32 through the prism 32 varies depending on the position of the first side surface 32a of the prism 32, The light passing through the image panel 31 is refracted nonuniformly and light is incident on the light incident on the image panel 31. If there is a difference in the optical aberration, the image is distorted or unclear.

A cylinder lens 33 may be used to reduce the aberration caused by the optical path of the prism 32. The light transmitted through the prism 32 varies in accordance with the position at which the light is incident on the prism 32 and aberration occurs. Light having a short distance passing through the prism 32 passes through the cylinder lens 33 Light having a large distance and a long distance passing through the prism 32 can reduce the distance through which the cylinder lens 33 passes, thereby reducing the aberration.

6 and 7 illustrate paths of light incident on the image panel 31 through the cylinder lens 33 and the prism 32. Fig. 6 is a plan view (xy) and Fig. 7 is a rear view (xz) .

Since the reflector 20 changes only the path of light, it is shown that light is incident on the synthesis system 30 directly from the light source unit 10 for the sake of convenience of explanation of refraction of light. Hereinafter, the arrangement of the cylinder lens 33 and the path through which the light travels will be described in detail with reference to FIGS. 6 and 7. FIG.

Light incident on one side of the light incident on the first side face 32a of the prism 32, that is, the portion A adjacent to the corner between the first side face 32a and the third side face 32c, ) Is short.

The cylinder lens 33 is arranged such that light passing through a thick portion of the cylinder lens 33 is incident on a first side A of the first side 32a of the prism 32. [

On the other hand, the light incident on the other portion B of the third side surface 32c of the prism 32, that is, the portion B adjacent to the edge between the first side surface 32a and the third side surface 32c, 32) is long.

The cylinder lens 33 is disposed such that light passing through a thin portion of the cylinder lens 33 is incident on the other side portion B of the first side surface 32a of the prism 32 in order to compensate for this.

That is, the thick portion 33 'of the cylinder lens 33 is disposed toward the A portion of the first side of the prism 32, and the thin portion 33' 'is disposed toward the B portion of the first side of the prism 32 do.

Accordingly, as shown in FIG. 4, the cylinder lens 33 of the present invention uses only a part of the lenses that are symmetrical in the left and right direction, and the size of the unused portion can be cut off. In the asymmetric cylinder lens 33, the cross section of one side portion 33 'is larger than the cross section of the other side portion 33 ".

Referring to the plan view of FIG. 6, the cylinder lens 33 is arranged obliquely such that one side portion 33 'is inclined toward the prism 32 and the other side portion 33' 'is inclined toward the light source.

Not only the distance through which the light passes through the cylinder lens 33 but also the angle of the light incident on the cylinder lens 33 from the light source and the angle incident on the prism 32 are also important factors for reducing the aberration. By tilting the cylinder lens 33 obliquely, the light path can be adjusted by adjusting the angle of the light incident on the cylinder lens 33.

The left and right sides of the cylinder lens 33 are formed to have an asymmetrical thickness in order to compensate for the difference in the distance through the prism 32 depending on the position of the light incident on the first side of the prism 32 of the present invention, The cylinder lens 33 is arranged obliquely to obtain a uniform and clear image without aberration by controlling the angle of incidence to the lens 32. [

The position of the cylinder lens 33 is affected not only by the prism 32 but also by the light incident from the relay lens 16. The relay lens 16 of the light source unit 10 converges the light traveling in the x-axis direction in the y-axis direction as shown in Fig. 6 and converges the light in the y-axis direction in the z- . Since the radius of curvature of the relay lens 16 in the horizontal direction is smaller than the radius of curvature in the vertical direction, light is more converged in the horizontal direction than in the vertical direction.

In order to narrowly supply light bent in the y-axis and the z-axis passing through the relay lens 16 to the image panel 31 in the horizontal direction (y-axis direction) and vertically (z-axis direction) The cylinder lens 33 refracts incident light in the horizontal direction (y-axis direction) while refracting it in the vertical direction (z-axis direction).

The cylinder lens 33 has a radius of curvature in the y-axis direction and a radius of curvature in the z-axis direction in order to make the degrees of refraction in the horizontal direction and the vertical direction different. The larger the radius of curvature is, the more gentle the light is not refracted. The radius of curvature in the horizontal direction is larger than the radius of curvature in the vertical direction.

Since the cylinder lens 33 is obliquely arranged between the light source unit 10 and the prism, the other side portion 33 "of the cylinder lens 33 comes close to the reflector. There is a problem that the axial length becomes longer.

In order to minimize this, it is possible to bring the distance from the cylinder lens 33 closer to each other by cutting off the corner of the reflecting mirror 20 and partially overlapping the cylinder lens 33 on a plane.

Since the cut edge portion of the reflector 30 does not pass through the light, it does not affect the performance, so the unnecessary portion can be cut out to make the size of the projector more compact.

In the cylinder lens, if the hemispherical lens is used as it is, only the size of the projector is enlarged at the portion where the actual light does not pass through, so that one side portion and the upper and lower portions which are not used can be cut as shown in Fig. 2, have.

As described above, the projector of the present invention is compact in size by joining the vertical and horizontal directions of the projector, which is widely spread in the horizontal direction, and is easy to carry and portable.

Also, the light incident on the prism is uniformly supplied to the digital micromirror device by using the cylinder lens, thereby providing an accurate and clear image.

Further, by cutting a part of the reflection plate in accordance with the shape of the cylinder lens, the size of the projector can be further reduced.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

10: light source part (10) 11, 12, 13: lamp
14: color synthesizer 15: fly-eye lens
16: relay lens 20: reflector
30: composite system 31: image panel
32: prism 33: cylinder lens
40: projection lens 50: housing

Claims (16)

A light source for emitting light;
A reflector for reflecting light emitted from the light source unit and converting the direction of light;
A synthesizer for synthesizing an image based on the light reflected by the reflector and the image signal;
A projection lens for projecting an image synthesized in the capturing system; And
And a housing in which the light source unit, the synthesizing system, and the projection lens are housed. The method according to claim 1,
The light source unit supplies light in a vertical direction,
And the reflector converts the light in the vertical direction into a horizontal direction. The method according to claim 1,
The synthesis system
An image panel for combining light reflected from the reflector with an image signal;
And a prism that reflects light that is reflected by the reflector and is incident on the composite system, and that reflects light emitted from the image panel to change the direction of the light. The method of claim 3,
The prism has a triangular prism shape having a triangular upper surface and a lower triangular prism,
A prism having an edge on one side of the first side and a second side on which the image panel is disposed,
And a third side adjacent to the other edge of the first side and on which the projection lens is disposed,
Wherein the first side reflects light emitted from the image panel and is emitted to the third side. 5. The method of claim 4,
The synthesis system
Further comprising a cylinder lens interposed between the reflector and a first side of the prism to guide light reflected by the reflector to the image panel. 6. The method of claim 5,
The cylinder lens
Light incident on one side edge of the first side passes through a thick portion of the cylinder lens
The light incident on the other corner side passes through the thin portion of the cylinder lens
Wherein a thick portion of the cylinder lens is disposed in a shifted position in one direction. The method according to claim 6,
The cylinder lens
Wherein the lens is an asymmetric lens having a thick end at one end and a thin end at the other end. 6. The method of claim 5,
The cylinder lens
Wherein one side of the prism adjacent to one side of the prism is inclined toward the prism and the other side of the prism is inclined toward the reflecting mirror. 9. The method of claim 8,
Wherein the reflector has a quadrangular shape and an edge of one upper end adjacent to the projection lens has a shape corresponding to a tilt of the tilted cylinder lens. The method of claim 3,
Wherein the image panel is a digital micromirror device (DMD) having a pixel mirror that moves pixel by pixel. The method according to claim 1,
Wherein the housing has a vertical length longer than a width of a front surface thereof. The method according to claim 1,
The light source includes:
Three light sources for emitting red, green, and blue light,
And a color synthesizing unit for synthesizing light emitted from the light source into white light. 13. The method of claim 12,
And a light homogenizing unit for uniformly supplying light emitted from the color combining unit. 14. The method of claim 13,
Wherein the light uniformizing section includes a fly-eye lens and a relay lens. 15. The method of claim 14,
Wherein the relay lens has a curvature radius in the horizontal direction smaller than a curvature radius in the vertical direction. 15. The method of claim 14,
Wherein the relay lens collects light in a horizontal direction and diffuses light in a vertical direction.

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