KR101659898B1 - Projector having a photodetector - Google Patents
Projector having a photodetector Download PDFInfo
- Publication number
- KR101659898B1 KR101659898B1 KR1020150172298A KR20150172298A KR101659898B1 KR 101659898 B1 KR101659898 B1 KR 101659898B1 KR 1020150172298 A KR1020150172298 A KR 1020150172298A KR 20150172298 A KR20150172298 A KR 20150172298A KR 101659898 B1 KR101659898 B1 KR 101659898B1
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- KR
- South Korea
- Prior art keywords
- light
- optical system
- illumination
- relay lens
- image
- Prior art date
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S10/00—Lighting devices or systems producing a varying lighting effect
- F21S10/02—Lighting devices or systems producing a varying lighting effect changing colors
- F21S10/023—Lighting devices or systems producing a varying lighting effect changing colors by selectively switching fixed light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- H05B37/0218—
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Projection Apparatus (AREA)
Abstract
The present invention relates to a projector including a light path conversion section for receiving illumination light from an illumination optical system and transferring the light to an image element, receiving image light from the image element and transferring the image light to a projection optical system, and a light detector for receiving illumination light from the illumination optical system. Lt; / RTI >
The illumination light from the illumination optical system passes through the relay lens of the light path changing unit and the triangular prism in order to be transmitted to the image element, and the illumination light incident on the relay lens At least a part of the light is reflected by at least one internal reflection point formed on the relay lens and transmitted to the optical scepter, and the light source from the illumination optical system is disposed outside the effective path of the illumination light incident on the relay lens.
Description
BACKGROUND OF THE
In general, a spatial light modulator, which is an apparatus for projecting optical energy onto a screen, can be applied to various fields such as optical communication, image processing, and information display devices. Typically, such devices are divided into a direct-view image display device and a projection-type image display device according to a method of displaying optical energy on a screen.
An example of a direct-view type image display device is a CRT (Cathode Ray Tube). Such a CRT device is called a so-called CRT, and its image quality is excellent.
On the other hand, liquid crystal display (LCD), DMD (Deformable Mirror Device) and AMA (Actuated Mirror Array) are examples of projection type image display devices. The DMD and AMA are classified as Reflective Spatial Light Modulators. Since a projection system using a DMD uses a micromirror, reflection structures such as Total Internal Reflection (TIR) Is commonly used.
1 schematically shows an optical system for a projector using a TIR prism. The
However, the TIR prism having such a structure has an advantage that the deterioration of image quality is small due to the contrast gain. However, since the slope is at 45 degrees, the prism having an arbitrary refractive index can reflect or transmit light in the same space There is a problem in that it is difficult to precisely work in assembling the slopes after the formation of slopes or slopes, and it is difficult to adopt them in small electronic devices such as cellular phones due to the thickness of the TIR prism.
Further, in such a projector structure, a
However, in this case, the
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems, and it is an object of the present invention to provide a projector capable of replacing two TIR prisms in the past and capable of arranging a
In order to achieve the above-mentioned object, in a first aspect of the present invention, there is provided an image processing apparatus comprising: a light path conversion section for receiving illumination light from an illumination optical system and transferring the illumination light to an image element, receiving image light from the image element, And the light path changing unit is constituted by a single relay lens and a single triangular prism, and the relay lens has a first surface facing the illumination optical system and a second surface facing the illumination optical system, And the illumination light from the illumination optical system is transmitted to the image element through the relay lens and the triangular prism of the light path changing unit along the effective path, and at least a part of the illumination light incident on the relay lens At least one internal reflection point formed on the second surface of the relay lens, Is being transmitted to the optical detection chulsoja, the optical detection chulsoja comprises the characterizing feature being disposed on the outside of the effective travel path of the illumination light is the illumination light from the illumination optical system to be incident on the relay lens.
According to a second aspect of the present invention, there is provided an image forming apparatus including an optical path converting unit that receives illumination light from an illumination optical system and transfers the received illumination light to an image element, receives image light from the image element and transmits the received image light to a projection optical system, Wherein the light path changing section is constituted by one relay lens and one triangular prism, and the relay lens includes a first surface facing the illumination optical system and a second surface facing the triangular prism And the illumination light from the illumination optical system is transmitted to the image element through the relay lens and the triangular prism of the optical path changing unit along the effective path, and at least a part of the illumination light incident on the relay lens is reflected on the first surface of the relay lens The surface is reflected at at least one surface reflection point formed, And the light detector is characterized in that the illumination light from the illumination optical system is disposed outside the effective path of the illumination light incident on the relay lens.
In the first and second aspects, the illumination optical system includes a dichroic filter portion for combining the respective lights emitted from the red LED, the blue LED and the green LED into illumination light; A fly's eye lens in which a plurality of rectangular microlenses are formed for uniformizing the light passing through the dichroic filter portion; And a lens for transmitting the illumination light having passed through the fly-eye lens to a relay lens in the optical path changing section, the projector being configured to adjust a current or voltage to a red LED, a blue LED and a green LED of the illumination optical system The control unit is configured to adjust a current or voltage to the red LED, the blue LED, and the green LED based on the illuminance values of the red LED, the blue LED, and the green LED detected from the light detector.
Further, in the above-described embodiment, the image element is a DMD element, and when the DMD element is tilted in an ON state at +12 degrees, the angle of the illumination light incident on the DMD element through the triangular prism becomes 24 degrees or more, The center line of the lens is formed inclined with respect to the oblique plane of the triangular prism.
According to the present invention, it is possible to provide a light path changing unit capable of replacing two TIR prisms, thereby reducing the unit cost and assembly cost of parts, and providing an internal reflector structure advantageous in miniaturizing a projector.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view schematically showing an internal configuration of a projector using two prisms in the related art and a position of a photodetector. Fig.
2 is a view schematically showing an internal configuration of a projector according to the present invention;
3 is a view for explaining a feature of a reflective structure of a projector according to the present invention.
4 is a view for explaining an inclination angle of a reflective structure of a projector according to the present invention;
5 is a view schematically showing an incident path of an illumination light to an image element and an outgoing path of image light from an image element in a projector according to the present invention;
6 is a view showing a traveling direction of light from a relay lens to a light detecting element in a projector according to the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms.
The present embodiments are provided so that the disclosure of the present invention is thoroughly disclosed and that those skilled in the art will fully understand the scope of the present invention. And the present invention is only defined by the scope of the claims. Accordingly, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.
Like reference numerals refer to like elements throughout the specification. Moreover, terms used herein (to be referred to) are intended to illustrate embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations.
Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.
Hereinafter, the technical features of the present invention will be described in detail with reference to the accompanying drawings. 3 is a view schematically showing the endurance structure of the projector according to the present invention.
2, the
Hereinafter, the illumination
In front of each of the three
The
According to the
On the other hand, the light emitted from the
A part of the light emitted from the
As described above, the illumination light emitted to the
Next, the illumination light having a quadrangle-shaped optical profile passed through the fly-
3 is an enlarged view of the optical path changing unit 200 according to the present invention. 3, the optical path changer 200 according to an embodiment of the present invention includes a
3, in order to compensate for the optical path difference of the illumination light incident on the
That is, a light incidence point (hereinafter referred to as one light incidence point) located at one end of the illumination light incident on the
4, the
If the angle &thetas; is less than 0 DEG, the center line segment a of the relay lens is located below the normal line b and the light does not enter the
5 is a view showing a path of light that is generated by the
According to the present invention, the manufacturing cost can be reduced by using only one prism in comparison with the conventional optical path changing unit including two prism structures.
6 is an explanatory view for explaining the position of the optical probe 1000 in the first embodiment according to the present invention. As shown in FIG. 6, in the projector according to the present invention, the
In the present invention, since the
Specifically, as shown in FIG. 6, the
In the present embodiment, at least three internal reflection points R1, R2, and R3 are provided on the
For example, as shown in FIG. 6, there may be two internal reflection points such as r1 and r2, and there may be five internal reflection points including all of R1, R2, R3, r1 and r2 have. However, if the number of internal reflection points increases, the light detection efficiency may be improved. However, since the amount of light entering the
The
In this embodiment, some illumination light is incident on the inner surface of the relay lens at an angle larger than the critical angle of the relay lens 2 (210), and when the total internal reflection condition is totally reflected, the points of the incident point and the exit point are 7 degrees on the normal line and 4.76 mm on the upper side of the relay lens based on the optical axis Z2 while the illumination light incident on the normal line of the optical axis Z1 at 13 degrees and at the position 2.16 mm above the relay lens on the optical axis Z2 The light bundle enters the normal line of the optical axis Z2 at an incidence angle of 83.5 degrees and emits at a position 9.15 mm below the relay lens with respect to the optical axis Z1, The light beam located between the illumination light incident at 65.3 degrees to the normal of the optical axis Z2 arrives and the optical detector is positioned close to the extension axis of the optical axis Z2.
However, the arrangement of the incidence point and the emission point in the
FIG. 7 is an explanatory view for explaining the position of the
In the present invention, since the
7, a surface reflection point is formed on the
In the second embodiment, the light amount of the
The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made without departing from the essential characteristics of the present invention by those skilled in the art. Therefore, the embodiments disclosed in the present invention are for illustrative purposes only and are not intended to limit the scope of the present invention, and the scope of the present invention is not limited by these embodiments.
Therefore, the scope of the present invention should be construed as being covered by the following claims rather than being limited by the above embodiments, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.
10: projector 100: illumination optical system
200: optical path changing unit 300: reflective image element
400: projection
121, 122, 123: collimation lens 130: dichroic filter
131: first dichroic mirror 132: second dichroic mirror
210: relay lens 220: triangular prism
500: Exposure photocopier 600:
Claims (4)
Wherein the optical path changing section comprises a single relay lens and a single triangular prism, the relay lens including a first surface facing the illumination optical system and a second surface facing the triangular prism,
The illumination light from the illumination optical system is transmitted to the image element through the relay lens and the triangular prism of the optical path changing unit along the effective path along the optical axis of the illumination optical system,
At least a part of the illumination light incident on the relay lens is totally reflected by at least one internal reflection point formed on the second surface of the relay lens,
The light detecting element is disposed outside the effective path of the illumination light incident on the relay lens from the illumination optical system,
Wherein all the image lights formed by reflection from the DMD when the DMD element is in the ON state are incident on the projection optical system.
Wherein the optical path changing section comprises a single relay lens and a single triangular prism, the relay lens including a first surface facing the illumination optical system and a second surface facing the triangular prism,
The illumination light from the illumination optical system is transmitted to the image element through the relay lens and the triangular prism of the optical path changing unit along the effective path along the optical axis of the illumination optical system,
At least a part of the illumination light incident on the relay lens is reflected on at least one surface reflection point formed on the first surface of the relay lens and is transmitted to the light detector,
The light detecting element is disposed outside the effective path of the illumination light incident on the relay lens from the illumination optical system,
Wherein all the image lights formed by reflection from the DMD when the DMD element is in the ON state are incident on the projection optical system.
The illumination optical system
A dichroic filter part for combining the respective lights emitted from the red LED, the blue LED and the green LED with the illumination light;
A fly's eye lens in which a plurality of rectangular microlenses are formed to uniformize the light passing through the dichroic filter portion; And
And a lens for transmitting the illumination light having passed through the fly-eye lens to a relay lens in the optical path changing unit,
The projector further comprises a control unit for adjusting a current or voltage to the red LED, the blue LED and the green LED of the illumination optical system,
Wherein the controller adjusts a current or voltage to the red LED, the blue LED, and the green LED based on the illuminance values of the red LED, the blue LED, and the green LED detected from the light detector.
Wherein the image element is a DMD element,
The center line of the relay lens is tilted with respect to the oblique plane of the triangular prism so that the angle of the illumination light incident on the DMD element through the triangular prism becomes 24 degrees or more when the DMD element is tilted to +12 degrees or more, Is formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150172298A KR101659898B1 (en) | 2015-12-04 | 2015-12-04 | Projector having a photodetector |
Applications Claiming Priority (1)
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KR1020150172298A KR101659898B1 (en) | 2015-12-04 | 2015-12-04 | Projector having a photodetector |
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KR101659898B1 true KR101659898B1 (en) | 2016-09-30 |
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KR1020150172298A KR101659898B1 (en) | 2015-12-04 | 2015-12-04 | Projector having a photodetector |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190028185A (en) | 2017-09-08 | 2019-03-18 | 주식회사 세코닉스 | Projection device and image providing method by using it |
CN114236951A (en) * | 2021-12-10 | 2022-03-25 | 广景视睿科技(深圳)有限公司 | Miniature projection optical machine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110089763A (en) * | 2010-02-01 | 2011-08-09 | 삼성전자주식회사 | Projector |
JP2013083709A (en) * | 2011-10-06 | 2013-05-09 | Samsung Yokohama Research Institute Co Ltd | Image projection device |
-
2015
- 2015-12-04 KR KR1020150172298A patent/KR101659898B1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110089763A (en) * | 2010-02-01 | 2011-08-09 | 삼성전자주식회사 | Projector |
JP2013083709A (en) * | 2011-10-06 | 2013-05-09 | Samsung Yokohama Research Institute Co Ltd | Image projection device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190028185A (en) | 2017-09-08 | 2019-03-18 | 주식회사 세코닉스 | Projection device and image providing method by using it |
CN114236951A (en) * | 2021-12-10 | 2022-03-25 | 广景视睿科技(深圳)有限公司 | Miniature projection optical machine |
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